Pololu
0.100 (2.54 mm) Female Header: 2x20-Pin, Straight
The 0.100″ (2.54 mm) 2×20-Pin Straight Female Header is a double-row, 40-pin socket strip designed to mate with standard 0.1″ pitch male headers. This is the...
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The 0.100″ (2.54 mm) 2×20-Pin Straight Female Header is a double-row, 40-pin socket strip designed to mate with standard 0.1″ pitch male headers. This is the standard GPIO header size used on Raspberry Pi and other single-board computers, making it an essential connector for SBC projects.
The 2×20 configuration provides 40 pins for full GPIO access, including power, ground, I2C, SPI, UART, and general-purpose I/O lines when used with compatible boards.
Key Features
- 0.1″ (2.54 mm) Pitch – Industry-standard spacing compatible with perfboard and PCBs
- Straight Orientation – Mounts perpendicular to the PCB for standard vertical connections
- 2×20-Pin Configuration – Double-row, 40-position socket matching the Raspberry Pi GPIO layout
- Through-Hole Mounting – Solders directly to standard PCBs
Ideal For
- Raspberry Pi GPIO breakout boards and HATs
- Single-board computer accessories and shields
- Custom PCB designs requiring full 40-pin GPIO access
- Prototyping and board-to-board interconnects
Package Contents
- 1× 0.100″ (2.54 mm) 2×20-Pin Straight Female Header
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- GPIO
- General-purpose input/output pins are microcontroller pins you can set in software to read signals, switch devices on and off, or connect to peripherals. The number of GPIO pins matters because it limits how many buttons, LEDs, sensors, and other parts you can wire directly to the board.
- Headers
- Rows of connector contacts on a fixed pitch (commonly 2.54 mm) used to link a board to a breadboard, jumper wires, or another board. They come as male pin headers and female socket headers; when a module ships with pre-soldered headers it can be used straight away, whereas bare pads require soldering the pins yourself.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- PCB
- A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
- single-board computer
- A complete computer built onto one circuit board, usually including the processor, memory, ports, and connectors. This matters because accessories like heatsinks must match the board’s layout and mounting holes to fit properly.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
- through-hole
- A mounting style where the component leads pass through holes in a circuit board and are soldered on the other side. Through-hole parts are often easier to handle and solder by hand, which is useful for classroom and hobby projects.
- UART
- UART is a simple asynchronous serial interface that sends data over separate transmit and receive wires, usually labelled TX and RX, with both ends set to the same baud rate. It is a common way for microcontrollers and other serial devices to exchange data.
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