STEMMA QT / Qwiic Breadboard Breakout Adapter
PCB adapter that exposes I2C signals from a JST SH 4-pin STEMMA QT / Qwiic connector to breadboard-friendly 0.1" pins. Lets standard I2C boards without a JST SH port join a STEMMA QT / Qwiic chain.
Pinout
- SCL
I2C clock broken out from the JST SH Qwiic / STEMMA QT connectors to plated through holes; Adafruit product page states the board breaks out I2C pins and four through holes for SCL, SDA, 3.3V and GND.
Type · I2CVoltage · 3.3 V I2C bus context from the same 3.3V breakout power rail; no separate level shifting claimed. - SDA
I2C data broken out from the JST SH Qwiic / STEMMA QT connectors to plated through holes; same I2C bus as the two JST SH ports.
Type · I2CVoltage · 3.3 V I2C bus context from the same 3.3V breakout power rail; no separate level shifting claimed. - 3.3V
3.3 V power rail broken out from the Qwiic / STEMMA QT connector bus to a plated through hole.
Type · PowerVoltage · 3.3 V - GND
Ground rail broken out from the Qwiic / STEMMA QT connector bus to a plated through hole.
Type · GroundVoltage · 0 V reference
| Pin | Type | Function | Voltage |
|---|---|---|---|
| SCL | I2C | I2C clock broken out from the JST SH Qwiic / STEMMA QT connectors to plated through holes; Adafruit product page states the board breaks out I2C pins and four through holes for SCL, SDA, 3.3V and GND. | 3.3 V I2C bus context from the same 3.3V breakout power rail; no separate level shifting claimed. |
| SDA | I2C | I2C data broken out from the JST SH Qwiic / STEMMA QT connectors to plated through holes; same I2C bus as the two JST SH ports. | 3.3 V I2C bus context from the same 3.3V breakout power rail; no separate level shifting claimed. |
| 3.3V | Power | 3.3 V power rail broken out from the Qwiic / STEMMA QT connector bus to a plated through hole. | 3.3 V |
| GND | Ground | Ground rail broken out from the Qwiic / STEMMA QT connector bus to a plated through hole. | 0 V reference |
Pin details
4 connections- SCL
I2C clock broken out from the JST SH Qwiic / STEMMA QT connectors to plated through holes; Adafruit product page states the board breaks out I2C pins and four through holes for SCL, SDA, 3.3V and GND.
I2CVoltage · 3.3 V I2C bus context from the same 3.3V breakout power rail; no separate level shifting claimed. - SDA
I2C data broken out from the JST SH Qwiic / STEMMA QT connectors to plated through holes; same I2C bus as the two JST SH ports.
I2CVoltage · 3.3 V I2C bus context from the same 3.3V breakout power rail; no separate level shifting claimed. - 3.3V
3.3 V power rail broken out from the Qwiic / STEMMA QT connector bus to a plated through hole.
PowerVoltage · 3.3 V - GND
Ground rail broken out from the Qwiic / STEMMA QT connector bus to a plated through hole.
GroundVoltage · 0 V reference
Connectors
223 other optionsPassive adapters, 2.54 mm pin headers, terminal blocks, JST and barrel-jack connector pairs, RF antennas and microSD adapters. Mechanical fit between two connectors does not confirm voltage, pinout or protocol compatibility.
0.1" (2.54 mm) Arduino Male Pin Headers Straight Green (10PCS) visual preview0.1" (2.54 mm) Arduino Male Pin Headers Straight Green (10PCS)
0.1" (2.54 mm) Arduino Male Pin Headers Straight Yellow (10PCS) visual preview0.1" (2.54 mm) Arduino Male Pin Headers Straight Yellow (10PCS)
0.1" 2x20-pin Strip Right Angle Female Header visual preview0.1" 2x20-pin Strip Right Angle Female Header
0.1" 36-pin Strip Right-Angle Female/Socket Header (5 pack) visual preview0.1" 36-pin Strip Right-Angle Female/Socket Header (5 pack)
1.25mm Pitch 5-pin Cable Matching Pair 10 cm long visual preview1.25mm Pitch 5-pin Cable Matching Pair 10 cm long
1.25mm Pitch 8-pin Cable Matching Pair - 10 cm long visual preview1.25mm Pitch 8-pin Cable Matching Pair - 10 cm long
2-pin JST SM Plug + Receptacle Cable Set visual preview2-pin JST SM Plug + Receptacle Cable Set
2-Prong Barbed Fitting Connector for Silicone Tubing - 5-pack visual preview2-Prong Barbed Fitting Connector for Silicone Tubing - 5-pack
2.1mm DC Female Connector to Alligator Clips visual preview2.1mm DC Female Connector to Alligator Clips
2.1mm DC Power Jack with Rocker Switch visual preview2.1mm DC Power Jack with Rocker Switch
2.1mm DC Power Jack with Slide Switch visual preview2.1mm DC Power Jack with Slide Switch
2.1mm Plug/Jack to Screw Terminal Block visual preview2.1mm Plug/Jack to Screw Terminal Block
Related groups
4 groups
"Wire Wrap" Thin Prototyping & Repair Wire - 200m 30AWG Blue visual previewCables
Around 250 entries: JST SH/PH cable pairs, Grove and STEMMA QT/Qwiic leads, jumper wires, silicone hookup wire from 30 AWG to 8 AWG, and FPC ribbon cables. Ecosystem bridge cables exist for the PH-to-SH pitch mismatch.
Connectors & cables · Cables & wires · 261 parts
5.5/2.1mm DC to Micro USB Adapter visual previewUSB and serial
Passive USB cables plus passive USB cables, Micro-B and USB-C breakouts, CP2102 and FT232 USB-UART bridges, DIY cable assembly parts, and USB-C development boards. Data support, host/device role and logic voltage vary significantly across the group.
Connectors & cables · USB cables · 91 parts
1.75mm PLA (1kg) - Black visual preview3D printing
DFRobot 1.75 mm PLA in 1 kg spools makes up the bulk of the group, in over 15 colors. Specialty options include PVA in both diameters, NinjaFlex flexible filament, Proto-Pasta conductive PLA, and wood-fill. OverLord printer spares and OverLord printers round out the hardware side.
Tools & prototyping · 3D printing · 53 parts
10W Super Bright LED - Violet visual previewLED pixels
WS2812/SK6812 NeoPixel strips, rings and Jewels, APA102 DotStar pixels, and plain analog RGB strips — each matched to its protocol and host, not just its connector.
Components · Addressable LEDs · 180 parts