Micro USB Pinout Diagram and 5-Pin Signal Map
5-pin rectangular connector
Standards: USB 2.0, USB OTG 2.0, USB Battery Charging 1.2
What is the Micro-USB pinout?
The Micro-USB (Micro-B) Connector has 5 pins. Pin 1 is VBUS (power). Pin 2 is D- (data). Pin 3 is D+ (data). Pin 4 is ID (data). Plus 1 more pins.
Standards: USB 2.0, USB OTG 2.0, USB Battery Charging 1.2
Pin Assignment Table
| Pin | Signal | Type | Description |
|---|---|---|---|
| 1 | VBUS | power | +5V Power (Red wire) - Up to 500mA (USB 2.0) or 1.5A (BC 1.2) |
| 2 | D- | data | Data Minus (White wire) |
| 3 | D+ | data | Data Plus (Green wire) |
| 4 | ID | data | ID Pin - Float for device mode, ground for OTG host mode |
| 5 | GND | ground | Ground (Black wire) |
Signal Types
Common Applications
Need another printable connector reference?
Use the pinout as a working reference now, then jump to the full library or the next workflow when you need it.
Browse more connector references →The Micro-USB connector has 5 pins: Pin 1 (VBUS, 5V), Pin 2 (D-), Pin 3 (D+), and Pin 4 (ID). Plus 1 more pins. Common in Android smartphones (pre-2016) and Tablets and e-readers.
Micro-USB (Micro-B) Pinout Guide
Micro-USB (Micro-B) was designed as the successor to Mini-USB with a focus on durability, compactness, and standardization. The connector is rated for 10,000 insertion cycles and features a more robust latching mechanism. The 5-pin design is functionally identical to Mini-USB: VBUS (+5V), D-, D+, ID, and GND. The ID pin enables USB OTG functionality - when grounded through a specific resistance, it signals the device to operate as a USB host. Micro-USB became the EU-mandated universal charger connector in 2009, leading to its near-universal adoption for mobile devices until USB-C emerged as the new standard.
Wiring Tips & Best Practices
Standard wire colors: Red = VBUS (+5V), White = D- (Data Minus), Green = D+ (Data Plus), Black = GND (Ground). The ID pin (Pin 4) determines OTG mode: grounded = host mode, floating = device mode. For USB OTG cables, the ID pin should be connected to ground through a 10 ohm or less resistance. Quick Charge and other fast charging protocols use the D+/D- lines to negotiate higher voltages (9V, 12V) - these require specific resistor configurations and compatible chargers. Micro-USB can deliver up to 500mA at 5V per USB 2.0 spec, or higher currents with USB Battery Charging specification support.
Common Issues
The most common failure is the connector breaking off the PCB due to lateral stress from plugging/unplugging at angles. Loose or wobbly connections indicate worn latching tabs or socket damage. Charging but no data transfer: The cable may be charge-only, missing D+/D- conductors. Slow charging: Check cable quality (thin wires cause voltage drop), or the charger may not support the device's fast charging protocol. OTG not working: Verify proper ID pin grounding in the OTG adapter. Micro-USB 3.0 (wider connector with additional pins) is backward compatible with Micro-USB 2.0 ports but not vice versa. Water or debris in the port causes corrosion or shorts - clean with compressed air or isopropyl alcohol.
Why Use Interactive Diagrams?
- Accuracy: Hover over pins to see exact signal names and descriptions
- Clarity: Color-coded by signal type (power, ground, data)
- Printable: Export clean diagrams for shop floor reference