ITEQ IT-958G: Low-Loss PCB Laminate for High-Speed Digital Applications

Introduction to ITEQ IT-958G

What is ITEQ IT-958G laminate?

Key electrical and thermal properties

Detailed datasheet table

Why engineers choose ITEQ IT-958G for high-speed design

Comparison with other low-loss materials

PCB design guidelines (engineer perspective)

Typical applications (5G / server / high-speed digital)

Manufacturing & processing considerations

Advantages and limitations

Useful resources & datasheet download

FAQs

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Introduction to ITEQ IT-958G

In high-speed PCB design, material selection is no longer a background decision—it directly defines signal integrity, insertion loss, and long-term reliability. Over the past decade, engineers have steadily moved from standard FR-4 toward low-loss laminates to support multi-gigabit data rates.

One material that consistently appears in server, telecom, and high-speed digital stackups is ITEQ IT-958G. Positioned between mid-loss FR-4 and ultra-low-loss materials, it provides a balanced solution for cost, performance, and manufacturability.

From a PCB engineer’s standpoint, ITEQ IT-958G is not just “another laminate”—it is often the practical choice when you need stable electrical performance without jumping to expensive PTFE-based systems.

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What is ITEQ IT-958G?

ITEQ IT-958G is a halogen-free, high Tg, low-loss epoxy laminate and prepreg system designed for high-speed digital and RF applications. Wasabi

It uses advanced resin technology to deliver:

Low dielectric constant (Dk)

Low dissipation factor (Df)

Stable electrical performance across environments

Strong thermal reliability

At its core, IT-958G fills the gap between traditional FR-4 and premium ultra-low-loss materials.

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Key Electrical Performance of ITEQ IT-958G

For high-speed engineers, two parameters dominate material selection:

Dielectric Constant (Dk) → affects impedance and propagation delay

Dissipation Factor (Df) → defines signal loss

Electrical Characteristics

Parameter	Value
Dk @ 10GHz	~3.70
Df @ 10GHz	~0.007
Dk stability	Very stable vs frequency
Signal loss	Low

These values position ITEQ IT-958G firmly in the “low-loss” category, making it suitable for:

10–25 Gbps digital links

Backplane routing

High-speed connectors

Low Df directly reduces insertion loss, which is critical in long trace designs. Miracle Technology

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Thermal and Mechanical Properties

From fabrication and reliability perspectives, IT-958G performs similarly to high-end FR-4—but with improved thermal margins.

Thermal Performance Table

Property	Typical Value
Tg (DSC)	175°C
Td (decomposition)	~400°C
T260	>60 min
T288	>60 min
CTE (X/Y)	12 / 14 ppm/°C
Z-axis expansion	~2.5%

These values indicate:

Excellent resistance to lead-free soldering

Strong multilayer reliability

Reduced risk of delamination

Wasabi

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Full ITEQ IT-958G Datasheet Overview

Below is a simplified engineer-friendly datasheet summary.

Electrical + Physical Summary

Category	Parameter	Value
Electrical	Dk (1–10 GHz)	3.85 → 3.70
Electrical	Df (1–10 GHz)	0.0054 → 0.007
Moisture	Absorption	≤0.08%
Mechanical	Flexural Strength	400–510 MPa
Electrical	Surface Resistivity	10¹⁰ MΩ
Thermal	Tg	175°C
Reliability	CAF resistance	High
Flammability	UL94	V-0

Miracle Technology+1

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Why Engineers Choose ITEQ IT-958G

From real-world PCB design experience, ITEQ IT-958G is chosen not just for specs—but for practical advantages.

1. Balanced Cost vs Performance

Lower cost than Rogers / Megtron 6

Better performance than standard FR-4

2. Stable Dk Across Frequency

Signal integrity simulations remain predictable across wide frequency bands. Wasabi

3. Easy Processing

Compatible with standard FR-4 processes

No special drilling or lamination complexity

4. Reliability in High Layer Count PCBs

Strong CAF resistance

Good Z-axis expansion control

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Comparison: ITEQ IT-958G vs Other Materials

Material	Dk	Df	Category	Cost
FR-4 (IT-180)	~4.0	0.015–0.02	Standard	Low
ITEQ IT-958G	~3.7	~0.007	Low-loss	Medium
Megtron 6	~3.3	~0.003	Very low-loss	High
Rogers 4350B	~3.48	~0.0037	RF	High

聯茂電子股份有限公司

�� Practical takeaway:
ITEQ IT-958G is ideal when you need better SI than FR-4 but cannot justify premium materials.

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PCB Design Guidelines (Engineer Perspective)

Using ITEQ IT-958G effectively requires a few practical considerations.

Stackup Design

Maintain tight impedance control (±5%)

Use thin cores for high-speed layers

Optimize glass styles for skew reduction

Signal Integrity Tips

Keep trace length matched for differential pairs

Avoid unnecessary vias

Use back-drilling for high-speed channels

Thermal Considerations

Add thermal vias under high-power ICs

Ensure proper copper balancing

Fabrication Notes

Works well with standard lamination cycles

No need for PTFE-specific handling

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Typical Applications of ITEQ IT-958G

Because of its performance profile, ITEQ IT-958G is widely used in:

High-Speed Digital Systems

Servers and storage systems

Switches and routers

Telecommunications

Base stations

Optical modules

Data Centers

Backplanes

High-layer-count PCBs

RF & Mixed Signal

Moderate-frequency RF circuits

Test equipment

Jarnistech

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Manufacturing Considerations

ITEQ IT-958G integrates smoothly into standard PCB processes:

Key Manufacturing Steps

Prepreg impregnation

Multilayer lamination

Drilling and plating

Imaging and etching

Surface finish (ENIG / OSP / Immersion Silver)

The material’s low moisture absorption (~0.08%) helps reduce defects like delamination during reflow. Miracle Technology

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Advantages and Limitations

Advantages

Low signal loss

High Tg and thermal stability

Cost-effective vs premium laminates

Easy processing

Limitations

Not suitable for ultra-low-loss (56G+ PAM4)

Slightly higher loss than Megtron series

Not ideal for extreme RF (>30 GHz)

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Useful Resources for Engineers

Here are valuable resources for deeper research:

Official ITEQ datasheet (PDF):
Download ITEQ IT-958G Datasheet

PCB material database platforms:

PCB Directory

ICSpec material database icspec.com

PCB material supplier reference:
�� ITEQ PCB

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FAQs About ITEQ IT-958G

1. What is the main advantage of ITEQ IT-958G?

Its biggest advantage is low loss with reasonable cost, making it ideal for high-speed digital designs.

2. Is ITEQ IT-958G better than FR-4?

Yes, especially for high-speed signals—lower Df means significantly reduced signal attenuation.

3. Can IT-958G be used for 5G applications?

Yes, for sub-6 GHz and moderate RF designs, but mmWave may require ultra-low-loss materials.

4. Is special processing required?

No. It is compatible with standard FR-4 PCB manufacturing processes.

5. What data rates can it support?

Typically suitable for 10G–25G designs, depending on stackup and routing.

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Final Thoughts

From an engineering perspective, ITEQ IT-958G sits in a very practical sweet spot. It delivers:

Reliable signal integrity

Strong thermal performance

Manufacturability without headaches

For most high-speed digital applications that don’t require ultra-low-loss materials, IT-958G is often the most rational choice—not just the best-performing one on paper.