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ITEQ IT-889GT is a halogen-free, UL-recognized metal core PCB laminate for LED lighting, automotive, and power electronics. Learn specs, fabrication tips, application guidance, and how IT-889GT compares to IT-859GTA and competing IMS materials

When you’re looking at Insulated Metal Substrate (IMS) materials for a new LED driver board or power electronics design, the shortlist usually comes down to a handful of proven dielectric systems. ITEQ IT-889GT has earned its spot on that list. It’s a UL-recognized, halogen-free metal core PCB laminate from ITEQ Corporation — the same Taiwan-based laminate manufacturer behind the IT-859GTA — and it targets applications where reliable heat transfer, environmental compliance, and lead-free assembly compatibility all have to coexist in a single material specification.

This article breaks down everything a PCB design or process engineer needs to know about ITEQ IT-889GT: its material architecture, key specifications, how it positions against competing IMS products, fabrication considerations, and where it makes the most design sense.

What Is ITEQ IT-889GT?

ITEQ IT-889GT is a halogen-free, filled epoxy IMS (Insulated Metal Substrate) laminate manufactured by ITEQ PCB, a Taiwan-headquartered copper-clad laminate producer founded in 1997. The material belongs to ITEQ’s IMS product family alongside the IT-859GTA and is specifically formulated as a thermally efficient dielectric layer for metal-base PCBs.

Like all IMS materials, IT-889GT uses a trilayer construction: a copper circuit foil on top, a thermally conductive filled-epoxy dielectric in the middle, and an aluminum base plate at the bottom. What differentiates IMS laminates from each other is almost entirely the dielectric layer — its filler chemistry, glass reinforcement, and resin system determine thermal conductivity, isolation voltage, peel strength, and process behavior. IT-889GT is engineered to hit the performance benchmarks demanded by LED lighting, automotive electronics, and industrial power conversion while remaining fully RoHS compliant.

ITEQ IT-889GT holds UL recognition under ITEQ’s E178114 file number, appearing alongside IT-859GTA and IT-859GT in Saturn Electronics’ UL Materials Chart for IMS PCB products. That listing also confirms that both Ventec VT-4A1 and Laird T-Lam SS LLD are qualified alongside it — useful reference points when you’re evaluating IMS material equivalents during a second-source qualification.

Core IMS Layer Architecture

Layer	Material	Key Function
Circuit Layer	Copper foil (various weights)	Routing, current carrying, lateral heat spreading
Dielectric Layer	Halogen-free filled epoxy resin	Electrical isolation + through-plane thermal transfer
Metal Substrate	Aluminum base	Heat spreading, structural support, heatsink interface

ITEQ IT-889GT Key Specifications

The spec data below consolidates what’s verifiable from ITEQ product documentation and UL certification records. Engineers working on a new design should always request the current ITEQ datasheet from their fabricator or distributor, as specific values like isolation voltage and dielectric thickness options may be updated between revisions.

Property	Value / Status
Material Type	Halogen-Free Filled Epoxy IMS Laminate
Flammability Rating	UL 94 V-0
Lead-Free Assembly	Compatible (260°C)
Halogen Compliance	Halogen-Free (RoHS, JPCA-ES-01-2003)
Base Metal	Aluminum
Construction	Single-side
UL Recognition	Yes — E178114
Solder Mask Options	White (LED reflectivity) / Green / Black

How to Read These Specs for Your Design

The 260°C lead-free assembly rating is the critical number for process engineers. It tells you this material can handle SAC305 reflow profiles without dielectric-to-copper delamination, which is one of the most common and costly failure modes on inferior IMS boards. ITEQ laminates carry a UL 94 V-0 flammability rating, meaning IT-889GT meets the highest-rated flammability class for self-extinguishing behavior — a non-negotiable requirement in most lighting and automotive safety standards.

The halogen-free designation means the dielectric contains less than 900 ppm chlorine, less than 900 ppm bromine, and less than 1,500 ppm total halogens by weight, in accordance with IEC 61249-2-21 and JPCA-ES-01-2003. This matters for EU market access (RoHS Directive 2011/65/EU) and is increasingly required by automotive OEM material qualification standards.

ITEQ IT-889GT vs. IT-859GTA: Understanding the IMS Family

Engineers who have worked with ITEQ’s IMS lineup know that IT-889GT and IT-859GTA are the two primary products in the family, both holding UL recognition under the same file number. Understanding how they differ helps you land on the right specification for your application.

Property	ITEQ IT-889GT	ITEQ IT-859GTA
Thermal Conductivity	Standard IMS tier	3W/mK (high thermal tier)
Tg (DSC)	Standard	100°°ä
Halogen-Free	Yes	Yes
Lead-Free (260°C)	Yes	Yes
UL 94 V-0	Yes	Yes
Dielectric Base	Filled Epoxy	Filled Epoxy + Glass Fabric
Primary Application	LED, general IMS	High-power LED, automotive

The distinction matters in practice. IT-859GTA was specifically developed for designs where thermal conductivity is the governing constraint — high-power LED lamp assemblies, automotive headlamp modules, street lighting fixtures. IT-889GT targets the broader IMS application space where reliable lead-free assembly, halogen-free compliance, and solid thermal performance are all required, but where the additional thermal conductivity of a 3W/mK system may not be justified by the power density of the design.

If your LED board is running 5W–15W total dissipation across the substrate, IT-889GT will handle the thermal budget cleanly. If you’re pushing 50W or more, or if junction temperature headroom is already tight, the conversation should shift toward IT-859GTA or higher-conductivity IMS materials.

Thermal Performance: What IMS Dielectrics Actually Do

It’s worth stepping back from spec numbers for a moment and thinking about what the dielectric layer in an IMS PCB is actually doing — because there’s a lot of confusion about where the thermal resistance really lives in these boards.

A typical IMS stack consists of a copper layer, thermal dielectric, and aluminum base. This structure provides excellent heat dissipation while maintaining electrical isolation. The aluminum substrate itself conducts heat extremely well — around 200 W/mK for standard alloys. But there’s always a dielectric layer in between the copper and aluminum, and standard dielectric epoxy has a thermal conductivity ranging from only about 5 to 10 W/mK, which means a conventional MCPCB effectively only achieves a few W/mK overall.

This is the key insight: the dielectric layer is the thermal bottleneck, not the aluminum. Improving the dielectric’s thermal conductivity — through ceramic filler loading, resin optimization, and reduced layer thickness — is what IMS material engineers are fundamentally trying to accomplish.

IMS PCBs with thermal conductivity values ranging from 1 to 8 W/m·K significantly outperform FR-4, which typically offers only about 0.3 W/m·K, making them ideal for applications where heat dissipation is a priority.

Dielectric Thickness and Its Role in Thermal Resistance

The thermal resistance of a dielectric layer follows a simple relationship: resistance increases with thickness and decreases with conductivity. The dielectric layer typically measures between 50 µm to 200 µm in thickness and offers thermal conductivity ranging from 1 to 8 W/m·K. For IT-889GT, the standard dielectric thickness is typically 100 µm — a common IMS industry standard that balances isolation voltage (enough thickness to withstand hi-pot testing) against thermal resistance (thin enough to transfer heat efficiently).

Application Areas for ITEQ IT-889GT

LED Lighting Boards

LED lighting is the core application domain for IT-889GT, covering a wide range of power levels and form factors:

• General commercial LED downlights and panels
• Backlighting for LCD displays and signage
• Architectural and decorative LED modules
• Low-to-mid power street lighting fixtures
• Traffic signal lamp boards

For standard LED applications where power density is moderate, IT-889GT provides the right combination of thermal performance, halogen-free compliance, and SMT process compatibility. White solder mask is the standard call here — it maximizes reflectivity off the board surface, which matters when you’re trying to extract every lumen from the design.

Automotive Lighting and Electronics

Automotive lamp assemblies — interior cabin lighting, daytime running lights (DRLs), rear lamp clusters — are a growing segment for IMS materials. Automotive lighting and ECUs use IMS for stable thermal behavior and vibration resistance in harsh environments. IT-889GT’s lead-free compatibility and halogen-free status align with automotive OEM material requirements, and the UL recognition simplifies the path through safety certification for end products.

Industrial Power Electronics

Power converters, industrial control systems, and communication equipment are among the applications where metal core PCB materials are widely used as power levels increase and device footprints shrink. Single-layer IT-889GT boards work well as mounting substrates for power switching devices — MOSFETs, IGBTs, and rectifier diodes — where the thermal pad connects directly to the dielectric and heat conducts down into the aluminum base.

Consumer Electronics Power Modules

Battery charging modules, LED driver ICs, and power conditioning circuits in consumer devices all generate localized heat loads that standard FR-4 handles poorly at higher wattages. IT-889GT gives product designers the option to integrate thermal management into the board itself rather than relying entirely on external heatsinks, enabling slimmer product geometries.

Fabrication Considerations for IT-889GT

Getting the most out of any IMS material requires a few fabrication details to be handled correctly. These apply broadly to IT-889GT and the ITEQ IMS family.

SMT-Only Assembly on Single-Layer Builds

Single-layer IMS boards cannot support plated through-holes (PTH). A drill that penetrates the full board stack would short-circuit the copper layer to the aluminum base. All component mounting is surface-mount only. Mounting holes for mechanical fasteners must use an oversized drill diameter with a back-drill or isolation ring to keep the hole wall clear of the metal substrate — this should be called out explicitly in fabrication notes.

Copper Weight Selection

Copper Weight	Typical Use Case	Current Capacity Guide
1 oz (35 µm)	Standard LED boards, signal traces	Up to ~5A on standard trace widths
2 oz (70 µm)	Mid-power LED drivers, mixed current	8–12A on appropriately sized traces
3 oz (105 µm)	Higher-current power boards	15–20A+ with wider traces

Heavy copper applications at 2 oz, 3 oz, or higher require special processing, which increases costs, but thicker foil directly improves conduction and lowers I²R losses in power-carrying traces.

Routing and Tooling Requirements

Aluminum-substrate IMS boards require carbide tooling for routing. The cutting characteristics differ from FR-4 — aluminum generates metallic swarf rather than glass dust, and carbide tooling wears differently. Confirm your fabricator has dedicated IMS routing experience, not just FR-4 capability.

Solder Mask for LED Applications

White LPI solder mask over IT-889GT boards is standard practice for LED lighting applications. Target reflectivity should exceed 85% for optimal luminous efficacy from the mounted LEDs. Green and black masks are used where reflectivity isn’t a consideration — black is sometimes specified on thermal-display products to minimize stray light.

Warpage Management

Thermal conductivity assisted by the aluminium core enables higher packing density, more stable operating parameters, and higher operational safety, but large-format IMS boards can still exhibit bow during reflow if copper distribution across the panel is uneven. For boards over 300–400mm in the longest dimension, aim for balanced copper fill and consult your fabricator on thermal profiling to minimize warpage.

ITEQ IT-889GT in the Broader IMS Market

Understanding where IT-889GT sits competitively requires knowing the full IMS dielectric landscape. The market ranges from basic 1–2 W/mK general-purpose materials to ceramic-filled specialty dielectrics above 6 W/mK.

IMS Material	Manufacturer	Thermal Conductivity	Halogen-Free	Best Fit
IT-889GT	ITEQ	Standard IMS tier	Yes	LED lighting, general IMS
IT-859GTA	ITEQ	3.0 W/mK	Yes	High-power LED, automotive
VT-4A1	Ventec	1.6 W/mK	Varies	General LED
VT-4B5	Ventec	4.2 W/mK	Varies	High-density LED modules
T-Lam SS LLD	Laird	Varies	Varies	Specialty thermal
Generic IMS	Various	1.0–2.0 W/mK	Varies	Commercial LED

The UL materials chart at Saturn Electronics lists IT-889GT alongside Ventec VT-4A1/VT-4A2 and Laird T-Lam SS LLD, which positions it clearly in the mid-performance IMS tier — above generic commodity materials and well-qualified for production use.

Useful Technical Resources for ITEQ IT-889GT

Resource	What You’ll Find	Link
ITEQ Corporation — IMS Product Page	Official IT-889GT overview, construction options, application guidance
UL Solutions Product iQ (E178114)	UL recognition file for ITEQ IMS materials including IT-889GT
Saturn Electronics — UL Materials Chart	IMS material comparison with UL status across manufacturers
PCB Directory — ITEQ Laminates	Full ITEQ laminate catalog with datasheet download links
IPC-6012 Standard	Qualification and performance specification for rigid PCBs
IEC 61249-2-21	Halogen-free laminate material standard definition
RoHS Directive 2011/65/EU	EU restriction on hazardous substances in electronics

Frequently Asked Questions About ITEQ IT-889GT

Q1: What is the difference between ITEQ IT-889GT and IT-859GTA, and how do I choose between them?

IT-859GTA is the higher thermal conductivity option in ITEQ’s IMS lineup at 3W/mK, with glass fabric reinforcement in the dielectric and a Tg of 100°°ä by DSC. IT-889GT is positioned as a strong-performing IMS material for applications that don’t require that top-tier thermal conductivity figure. The practical choice comes down to power density: for designs where LED or power device junction temperatures are tight and total power dissipation is high (50W+), IT-859GTA’s thermal edge justifies the specification. For moderate power density LED boards, IT-889GT delivers reliable performance with the same halogen-free and lead-free compliance credentials.

Q2: Can ITEQ IT-889GT be used for double-sided PCB construction?

IT-889GT is primarily specified in single-side construction, which is standard for IMS LED and power boards where the aluminum reverse face mounts directly to a heatsink or chassis. Double-side IMS constructions exist in the market but are less common and require specific stackup engineering. Confirm double-side availability with your fabricator and ITEQ directly if that configuration is required for your design.

Q3: What isolation voltage does IT-889GT support, and is it sufficient for mains-referenced circuits?

Isolation voltage requirements vary by application standard — residential LED fixtures, commercial lighting, and automotive lamp assemblies all have different hi-pot requirements. Standard IMS dielectrics in the 100 µm thickness range typically pass 2,500–3,000V AC hi-pot testing, which covers most general lighting safety requirements. For mains-referenced power supplies or higher-voltage automotive circuits, request the specific dielectric withstanding voltage value from the current ITEQ datasheet and verify against your applicable safety standard (IEC 62368-1, IEC 60598, AEC-Q200, etc.) before committing the material.

Q4: Is ITEQ IT-889GT compatible with vapor phase and selective soldering processes?

The material is rated for 260°C lead-free assembly, which covers standard convection reflow using SAC305 alloy profiles. Vapor phase soldering systems running SAC profiles typically peak at 230–240°C — comfortably within the material’s capability. Selective soldering on single-layer IMS boards is uncommon given SMT-only construction, but if required for specific through-hole connector pads isolated from the metal base, consult your process engineering team on localized thermal exposure and mask protection.

Q5: Where can I source ITEQ IT-889GT for prototype quantities, and what are typical lead times for a new material qualification?

IT-889GT is available through PCB fabricators that stock ITEQ IMS materials — the most practical route for prototype quantities is to specify the material by name in your fabrication notes and request it through an MCPCB-capable board house. For new material qualifications in automotive or industrial supply chains, plan for 4–8 weeks for specialty grade material availability, plus your own qualification testing time. PCB Directory’s ITEQ laminate listing is a useful starting point for identifying distributors and requesting datasheets.

Conclusion

ITEQ IT-889GT is a well-qualified, halogen-free metal core PCB laminate that covers a broad range of LED lighting, automotive, and power electronics applications where IMS technology is needed and full RoHS/halogen-free compliance is required. Its UL recognition under ITEQ’s E178114 file, 260°C lead-free assembly compatibility, and UL 94 V-0 flammability rating give it the compliance credentials most production designs need.

ITEQ has built its reputation on providing total, cost-effective solutions for the industry as a one-stop shop of rigid, flex, halogen-free, and environment-friendly materials, and IT-889GT reflects that positioning — a production-ready IMS material from a manufacturer with a serious track record in thermal laminate chemistry.

For design teams evaluating IMS materials, the key questions are always: what’s your thermal conductivity requirement, what are your compliance obligations, and what does your fabricator have qualified? IT-889GT answers two of those three confidently. Run the thermal resistance math with your specific dielectric thickness and power budget, compare against IT-859GTA if higher conductivity is warranted, and confirm availability with your preferred MCPCB fabricator before finalizing your material specification.

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ITEQ IT-889GT is a halogen-free, UL-recognized metal core PCB laminate for LED lighting, automotive, and power electronics. Learn specs, fabrication tips, application guidance, and how IT-889GT compares to IT-859GTA and competing IMS materials.

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