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

Specifications

• Connector Series: JST GH
  
• Number of Pins: 3 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
  
• Housing Material: Thermoplastic UL94V-0
  
• Contact Material: Phosphor Bronze (Tin-plated)
  
• Dimensions: 1.25mm pitch (Height: ~4.2mm)
  
• Weight: 0.005 kg [Estimated]
  
• Compatible Harness: 3-Pin JST GH Female Plug Cable Housing

Project Evolution

Unlock New Capabilities

• Past Projects (Prerequisites): If you've used 2-pin JST GH headers or standard 2.54mm connectors on Arduino or ESP32 boards, you know how bulky wiring wastes board space. Moving to a 3-pin JST GH straight connector is the next logical step for compact drone telemetry, I2C/UART modules, and custom PCB builds.
• Feature Upgrade (What This Unlocks): This 3-pin JST GH header unlocks ultra-compact power and signal routing (VCC, GND, Signal/Data) for space-constrained electronics. With a 1.25mm pitch and a positive locking latch, it ensures secure, vibration-proof connections on quadcopters, RC models, and small robotics boards.

Effort Level & Minimum Hardware

• Effort Level: Beginner 

Minimum hardware to get started:

• Custom PCB or Perfboard — to solder the 3-pin through-hole straight header onto your circuit.
  
• Soldering Station & Fine-Tip Solder — required to solder 1.25mm pitch pins without solder bridges.
  
• 3-Pin JST GH Female Wire Harness Cable — to mate with this PCB header for power and signal routing.

Virtual Technician & Wiring Guide
⚠️ Safety Warnings:

• Pin Pitch & Heat Limit: Keep soldering iron contact under 3 seconds at 300°C to prevent melting the thermoplastic housing.
• Current Limits: Do not exceed 1A continuous DC current per pin.
• Polarity Verification: Verify VCC, GND, and Signal pin mapping on your board before plugging in a harness to prevent reverse-polarity damage.

Package Includes: 

1× 3-Pin JST GH Male Straight PCB Header Connector (1.25mm Pitch) 

Frequently Asked Questions

1. Is this 3-pin JST GH connector compatible with 1.25mm pitch female cable harnesses?
   Yes, it mates directly with standard 3-pin JST GH female wire harness plugs featuring a 1.25mm pitch.
2. Can I use this 3-pin header on drone flight controllers like Pixhawk?
   Yes, 3-pin 1.25mm JST GH headers are standard for telemetry, I2C, and GPS ports on Pixhawk and ArduPilot boards.
3. Is this JST GH header compatible with JST SH or JST XH connectors?
   No, JST GH (1.25mm pitch with latch) is mechanically incompatible with JST SH (1.0mm) or JST XH (2.54mm) headers.
4. What is the maximum voltage rating for this 3-pin JST GH straight header? It is rated for operation up to 50V AC/DC.
5. What is the maximum current capacity per pin?
   Each pin safely carries up to 1A AC/DC continuous current.
6. Does this header feature a locking latch?
   Yes, the housing includes a positive locking latch to prevent disconnections under vibration.
7. How should this connector be mounted on a PCB?
   Solder it vertically through-hole onto your PCB with the latch groove oriented toward your cable entry point.
8. Are software drivers required for this connector?
   No, it is a passive hardware connector requiring no software drivers or code.
9. Can this 3-pin header route I2C or UART data signals?
   Yes, it reliably routes power (VCC/GND) alongside digital GPIO, UART, or I2C lines under 1A.
10. How do I prevent the plastic housing from melting during soldering?
    Limit soldering iron contact to under 3 seconds per pin at 300°C.
11. Why won't the female plug latch into the male header?
    Check for solder bridges or plastic flash blocking the locking ridge on the connector body.
12. What causes signal drops across the header?
    Inspect for cold solder joints at the PCB pads or loose terminal crimps inside the mating female harness.
13. Are these headers inspected for quality before shipping?
    Yes, every batch undergoes visual QC at Probots in Bangalore to verify pin pitch and latch integrity.
14. Is volume pricing available for production runs?
    Yes, Probots offers bulk pricing for OEM manufacturers, labs, and universities.
15. Does Probots assist with finding matching cable assemblies?
    Yes, our Bangalore engineering team can help identify compatible 1.25mm JST GH female wire harnesses.