4 Pin JST GH Male Connector 1.25mm Pitch Straight Header PCB Pin

Specifications

• Connector Series: JST GH
  
• Number of Pins: 4 Pin
  
• Pin Pitch: 1.25mm (0.049 inch)
  
• Mounting Style: Straight / Top Entry Through-Hole PCB Header
  
• Rated Voltage: 50V AC / DC
  
• Rated Current: 1A AC / DC per pin
  
• Contact Resistance: ≤ 30 mΩ
  
• Insulation Resistance: ≥ 100 MΩ
  
• Withstanding Voltage: 500V AC/minute
  
• Operating Temperature: -25°C to +85°C
  
• Contact Material: Phosphor Bronze (Tin-plated)
  
• Dimensions: 1.25mm pitch (Height: ~4.2mm)
  
• Weight: 0.005 kg [Estimated]
  
• Compatible Harness: 4-Pin JST GH Female Plug Cable Housing

Project Evolution

Unlock New Capabilities

• Past Projects (Prerequisites):If you've worked with 2-pin or 3-pin JST GH headers or bulky 2.54mm connectors on Arduino/ESP32 boards, moving to a 4-pin JST GH straight connector is the natural next step for micro-robotics, I2C/CAN bus interfaces, and flight controller telemetry links.
• Feature Upgrade (What This Unlocks): This 4-pin JST GH header provides ultra-compact power and dual-signal routing (VCC, GND, SDA/TX, SCL/RX) for space-critical electronics. Its 1.25mm pitch and positive locking latch ensure vibration-proof, reliable interconnects on quadcopters and high-density PCBs.

Effort Level & Minimum Hardware

• Effort Level: Beginner 

Minimum hardware to get started:

• Custom PCB or Perfboard — to solder the 4-pin through-hole header onto your circuit.
  
• Soldering Station & Fine-Tip Solder — required to solder 1.25mm pitch pins without creating bridges.
  
• 4-Pin JST GH Female Wire Harness Cable — to mate with this PCB header for power and data routing.

Virtual Technician & Wiring Guide
⚠️ Safety Warnings:

• Heat Limit: Keep soldering iron contact under 3 seconds at 300°C to prevent thermal damage to the thermoplastic housing.
• Current Rating: Do not exceed 1A continuous DC current per pin.
• Pinout Verification: Verify VCC, GND, and signal pin order before connecting a harness to avoid reverse-polarity damage.

Package Includes: 

1× 4-Pin JST GH Male Straight PCB Header Connector (1.25mm Pitch) 

Frequently Asked Questions

1. Is this 4-pin JST GH connector compatible with 1.25mm pitch female harnesses?
   Yes, it mates directly with standard 4-pin JST GH female wire harness plugs with 1.25mm pitch.
2. Can I use this on drone flight controllers like Pixhawk?
   Yes, 4-pin 1.25mm JST GH headers are standard for I2C, CAN bus, and telemetry ports on Pixhawk boards.
3. Is it interchangeable with JST SH or JST XH headers?
   No, JST GH (1.25mm) is mechanically incompatible with JST SH (1.0mm) or JST XH (2.54mm) connectors.
4. What is the maximum voltage rating?
   It is rated for operation up to 50V AC/DC.
5. What is the current rating per pin?
   Each pin safely handles up to 1A continuous AC/DC.
6. Does it include a locking latch?
   Yes, the positive locking latch prevents accidental unplugging under heavy vibration.
7. How should this connector be mounted on a PCB?
   Mount vertically through-hole with the locking groove aligned toward your cable entry side.
8. Are software drivers needed?
   No, it is a passive hardware connector requiring no drivers or firmware.
9. Can this route I2C or UART data lines?
   Yes, it commonly routes power (VCC/GND) alongside dual signal lines (SDA/SCL or TX/RX).
10. How do I prevent the housing from melting while soldering?
    Keep soldering iron contact under 3 seconds per pin at 300°C.
11. Why won't the female plug lock into place?
    Check for solder bridges or plastic debris blocking the latch mechanism.
12. What causes signal drops across pins?
    Inspect for cold solder joints on the PCB pads or improper crimps inside the female harness.
13. Are these headers verified for quality before shipping?
    Yes, every batch undergoes visual QC at Probots in Bangalore to confirm pin pitch and latch integrity.
14. Is bulk pricing available for production runs?
    Yes, Probots offers volume discounts for OEMs, labs, and universities.
15. Can Probots assist with matching cable assemblies?
    Yes, our Bangalore engineering team can help select compatible 1.25mm JST GH female harnesses.