4-Pin JST XH Polarised Connector 2.54mm Pitch Male and Female Wire Harness Cable

Specifications

• Connector Type: JST XH 4-Pin (Male PCB Header & Female Wire Harness)
  
• Pin Pitch: 2.54mm (0.1 inch)
  
• Keying: Polarised housing (prevents reverse insertion)
  
• Rated Voltage: 250V AC / DC
  
• Rated Current: 3A AC / DC per pin
  
• Wire Gauge: 26 AWG flexible stranded wire
  
• Wire Length: ~20 cm (200 mm)
  
• Wire Color Coding: Red / Black / Red / Black (2-pair color-coded harness)
  
• Contact Resistance: ≤ 20 mΩ
  
• Insulation Resistance: ≥ 1000 MΩ
  
• Withstanding Voltage: 1000V AC/minute
  
• Operating Temperature: -25°C to +85°C
  
• Compatible Platforms: NEMA 17 Stepper Motors, Custom PCBs, 2.54mm headers, OLED/LCD displays, microcontrollers

Project Evolution

???? Unlock New Capabilities

• Past Projects (Prerequisites): If you've already experimented with 2-pin power leads, 3-pin sensor modules, or basic breadboard wiring on an Arduino, you understand how essential secure interconnects are for reliable operation. Upgrading to a 4-pin JST XH wire harness is the ideal progression when moving to 4-wire components like bipolar stepper motors, I2C/SPI displays, or multi-signal sensor modules.
• Feature Upgrade (What This Unlocks): This 4-Pin JST XH Wire Harness unlocks quick-disconnect NEMA 17 stepper motor connections for 3D printers and CNC machines, plug-and-play OLED/LCD display modules, and clean 4-wire power-plus-data routing across custom PCBs. The polarised, keyed housing ensures that four-wire coil or signal connections cannot be plugged in backwards, protecting your drivers and microcontrollers from short circuits.

Effort Level & Minimum Hardware

• Effort Level: Beginner

Minimum hardware to get started:

• Microcontroller or Stepper Motor Driver (Arduino, RAMPS, A4988, or ESP32) — to send control signals or drive stepper motor coils through the 4-pin harness.
• 4-Wire Device (NEMA 17 Stepper Motor, I2C Display, or Sensor Array) — to connect to the wire harness assembly for reliable power and data transfer.
• Soldering Station & Solder Wire — required to solder the male 4-pin JST header onto your PCB or join harness wires to motor leads.
• Heat Shrink Tubing — to insulate wire splices and prevent accidental short circuits between adjacent power and signal wires.

Virtual Technician & Wiring Guide
⚠️ Safety Warnings:

• Pinout & Coil Pair Verification: When wiring stepper motors, always verify coil pair continuity with a multimeter before powering on. Swapping active coil phases or crossing power/signal lines can damage motor driver ICs.
• Current Limits: Ensure total current passing through all four 26 AWG harness wires does not exceed 3A continuous DC per pin.
• Insulation & Strain Relief: Always insulate soldered wire extensions with heat shrink tubing to prevent exposed copper strands from shorting against adjacent pins or metal frames.

Required Additional Items

• Soldering Iron & Solder: Needed to securely attach the male 2-pin header onto your circuit board or sensor module.
• Wire Strippers: Needed if you need to trim or strip the pre-tinned wire leads to length.
• Heat Shrink Tube Assortment Kit: Provides clean, professional insulation over soldered wire splices.

Package Includes: 

1× 4-pin JST XH Female Housing Connector with pre-crimped 150mm Wire Lead 

1× 4-pin JST XH Male Straight PCB Header Block

Frequently Asked Questions

1. Is this 4-pin JST XH connector compatible with standard 2.54mm breadboards or PCBs?
   Yes, the 4-pin male header features a standard 2.54mm (0.1 inch) pin pitch that fits seamlessly into perfboards, breadboards, and custom PCB layouts.
2. Can I use this 4-pin JST XH wire harness with NEMA 17 stepper motors? Yes, 4-pin JST XH connectors are the standard interface for connecting NEMA 17 4-wire bipolar stepper motor coils to motor driver boards.
3. Does this harness mate with 4-pin JST PH or JST VH connectors?
   No, JST XH (2.54mm pitch) is mechanically incompatible with JST PH (2.0mm pitch) or JST VH (3.96mm pitch) connectors due to differing pin spacing and body geometry.
4. Can I use this harness for OLED displays or I2C/SPI sensor modules?
   Yes, it is fully compatible with 4-pin I2C interfaces (VCC, GND, SDA, SCL) and 4-wire sensor/display modules requiring secure connectivity.
5. What is the maximum voltage rating for this 4-pin JST XH wire harness? The connector housing and 26 AWG insulated wire harness are rated for operation up to 250V AC/DC.
6. How much current can this 4-pin JST XH wire harness safely carry?
   This 4-wire harness assembly is rated for up to 3A DC continuous current per pin under normal ambient operating conditions.
7. Can I use this harness for high-current DC motors drawing over 5A?
   No, for continuous current loads exceeding 3A, higher-rated power connectors such as XT60, Anderson, or JST VH series should be used to prevent thermal overload.
8. How are the 4 wires in this harness color-coded?
   The harness features a 2-pair color coding (typically Red and Black pairs) to easily identify power, ground, or signal pairs.
9. Is the 4-pin JST XH connector housing polarised to prevent incorrect insertion?
   Yes, both the female plug housing and male PCB header feature molded guide keys that physically prevent backward or inverted mating.
10. Can I extend or solder the wires on this 4-pin harness assembly?
    Yes, the flexible stranded copper wire leads can be easily stripped, soldered to stepper motor leads or sensor cables, and insulated with heat shrink tubing.
11. Do I need any software libraries or drivers to use this 4-pin connector?
    No, this product is a passive mechanical hardware component and requires no software libraries, drivers, or firmware.
12. Can I pass high-speed SPI or UART signals through this 4-pin harness?
    Yes, for short cable runs (~20cm), the harness reliably carries SPI, UART, PWM, or digital data lines without significant signal attenuation.
13. Are any specific pin declarations required in Arduino code for this harness?
    No software code declarations are necessary because the harness serves as a physical electrical wire connection.
14. Why is my stepper motor or sensor not receiving power through the harness?
    Check for cold solder joints on the male PCB header and verify that the female harness plug is fully pushed in and latched into the header housing.
15. What should I do if a wire pin feels loose inside the female plastic plug? Carefully inspect the small metal locking latch on the crimped terminal pin and gently bend it outward so it snaps firmly into the plastic housing slot.
16. Why are the harness wires getting warm during operation?
    Wire heating indicates that the connected motor or circuit is drawing current close to or exceeding the 3A maximum continuous rating of the 26 AWG wires.
17. Can I swap or reorder individual wires inside the 4-pin female plug?
    Yes, you can depress the small plastic retention tab on the housing using a precision pin or needle to extract and re-position individual crimp pins.
18. Does Probots offer bulk quantity discounts for 4-pin JST XH wire harnesses?
    Yes, Probots provides tiered pricing and volume procurement options for educational institutes, industrial clients, and OEM manufacturers.
19. Are these 4-pin JST XH connectors pre-assembled and tested?
    Yes, each wire harness comes pre-crimped with 20cm wire leads and undergoes visual QC inspection to verify solid wire retention and pitch accuracy.
20. Does Probots provide technical support if I need assistance with wiring or compatibility?
    Yes, our technical support team in Bangalore is available to assist you with wiring inquiries, pinouts, and component integration.