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[Featured] High-Heat, High-Vibration-Resistant Board to Board Connectors – FX26/FX36/FX31 Series

Replacing Cable and Busbar Connections with Board to Board Connectors
Supports temperatures up to 140°C (FX26) and 125°C (FX36, FX31)
FX26, FX36, and FX31 Series | Vibration-Resistant Floating Connectors for Automotive Applications

FX26 Series connector FX26 Series FX36 Series connector FX36 Series FX31 Series connector FX31 Series

With the rapid growth of BEV and HEV production, internal connections in powertrain systems have traditionally relied on cable or busbar solutions, which can increase size, consume valuable space, and add assembly complexity.

The FX26, FX36, and FX31 Series are high-temperature, vibration-resistant board to board connectors developed to address these challenges. Supporting operating temperatures from -40°C to +140°C (FX26) and -40°C to +125°C (FX36 and FX31), the series is designed for demanding automotive environments.

Featuring unique contact designs combined with vibration-resistant floating structures, these connectors deliver highly reliable connections under harsh operating conditions.

The FX26, FX36, and FX31 Series support the transition to connector-based internal wiring in automotive systems such as ECUs, inverters, DC/DC converters, and battery packs, contributing to miniaturization, weight reduction, and more efficient automated assembly.

FX26 Series CES Innovation Awards® 2020 Honoree

The FX26 Series was recognized for its innovation in delivering high vibration resistance and high temperature resistance, combined with a unique connection structure.
It was selected as a CES Innovation Awards 2020 Honoree in the “Vehicle Intelligence & Transportation” category.

▶ CES2020 Innovation Awards

FX26 Series 16th JPCA Award – Encouragement Award

The series received the Encouragement Award at the 16th JPCA Awards in recognition of its innovation in solving stress concentration issues through a floating structure and achieving high reliability under harsh automotive environments.

▶ 第16回 JPCA賞（アワード）JPCA奨励賞受賞のお知らせ

Replacing Cable and Busbar Connections with Board to Board Connectors

Conventional Design

Conventional design: cable connection, busbar connection, and direct soldering between PCBs

Proposal

Board to Board Connection

Proposal: connection between upper and lower PCB
Connection Type Ease of Assembly Space Cost Reliability Design Flexibility
Wire to Board ○ ○
Board to Board ○ ○ ○ ○ It depends

Product Specifications

■Key Specifications

Item For Signal Lines For Power Lines
FX26 FX36 FX31
Pitch 1mm 0.5mm 9.5mm
Rated Current 0.5A/pin 0.5A/pin 25A/pin
Rated Voltage 125V AC/DC 50V AC/DC 800V AC/DC
Withstanding Voltage 375V AC (1 minute) 150V AC (1 minute) 2,500V AC (1 minute)
Insulation Resistance 1,000MΩ min. (250V DC) 100MΩ min. (100V DC) 1,000MΩ min. (1,000V DC)
Operating Temperature -40 to +140℃ -40 to +125℃ -40 to +125℃
Contact Structure 2-point contact 2-point contact 4-point contact

*Please refer to each product series page for details.

Automotive Connectors Contact Us

Features – Optimized for internal connections in automotive powertrain systems –

Vibration-Resistant Design for Harsh Automotive Environments

Unlike conventional floating connectors that are susceptible to Z-axis vibration, the FX26, FX36, and FX31 Series feature a proprietary floating structure that absorbs PCB movement in the mating direction, helping maintain stable performance in high-vibration automotive environments.

Vibration-resistant design (PCB misalignment absorption and PCB amplitude absorption, image: FX26)
Image FX26
FX26 FX36 FX31
PCB misalignment absorption
①②XY direction: Floating range
③Z direction: Effective mating length		 ±0.7mm
±0.75mm		 ±0.7ｍｍ
±0.5ｍｍ		 ±0.5mm
±1.5mm
PCB amplitude absorption
④⑤Total vibration absorption		 ⊿Z：0.05mm ⊿Z：0.05mm ⊿Z：0.05mm

High Temperature Resistance for Harsh Automotive Environments

The connectors have been verified through strict automotive qualification tests, including thermal shock testing (-40 to +125°C or +140°C, 1,000 cycles) and high-temperature exposure testing (1,000 hours at 125°C or 140°C).
They ensure reliable performance in high-temperature applications such as inverters, providing greater flexibility in system design and connector placement.

Hybrid Signal and Power Connections with FX26/FX36 and FX31 Series

By combining the FX26 and FX36 Series for signal lines with the FX31 Series for power lines, high-density mounting can be achieved.
This hybrid configuration contributes to significant size reduction and overall cost savings.

Applications (Use Case)

Electric components of the driving system such as in-vehicle inverters, DC/DC converters, and battery packs

Electric components of the driving system such as in-vehicle inverters, DC/DC converters, and battery packs

Industrial Equipment

Industrial Equipment

Automotive Connectors Contact Us
Hirose's Approach to Automotive Connectors

In cases where the application will demand a high level of reliability, such as automotive, please contact a company representative for further information.