# UC2637DWTR

**Texas Instruments** · Brushed DC Motor Drivers · SOIC-20

UC2637DWTR from Texas Instruments, in a SOIC-20. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | +VTH | input | Upper oscillator threshold voltage, accepting +VS-2V to -VS+2V input range with up to 10µA bias current. |
| 2 | CT | passive | External timing capacitor connection for oscillator frequency adjustment. |
| 3 | -VTH | input | Lower oscillator threshold voltage, accepting +VS-2V to -VS+2V input range with up to 0.5µA bias current. |
| 4 | AOUT | output | PWM output driver A, sourcing/sinking 100mA steady-state or 500mA pulsed maximum, output voltage 12-13.5V high or -14.5 to -13V low. |
| 5 | -VS | power_in | Negative supply voltage input, rated -2.5V to -20V absolute maximum. |
| 6 | N/C | unconnected | No internal connection. |
| 7 | +VS | power_in | Positive supply voltage input, rated +2.5V to +20V absolute maximum. |
| 8 | BOUT | output | PWM output driver B, sourcing/sinking 100mA steady-state or 500mA pulsed maximum, output voltage 12-13.5V high or -14.5 to -13V low. |
| 9 | +BIN | input | Positive input to PWM comparator B for pulse width control, common mode range -VS+1V to +VS-2V. |
| 10 | -BIN | input | Negative input to PWM comparator B for pulse width control, common mode range -VS+1V to +VS-2V. |
| 11 | -AIN | input | Negative input to PWM comparator A for pulse width control, common mode range -VS+1V to +VS-2V. |
| 12 | +AIN | input | Positive input to PWM comparator A for pulse width control, common mode range -VS+1V to +VS-2V. |
| 13 | +C/L | input | Positive current limit input for pulse-by-pulse current limiting, 200mV offset threshold at 25°C, common mode -VS to +VS-3V. |
| 14 | -C/L | input | Negative current limit input for pulse-by-pulse current limiting, 200mV offset threshold at 25°C, common mode -VS to +VS-3V. |
| 15 | SHUTDOWN | input | Shutdown control input with -2.5V temperature-compensated threshold; pulling below this disables output drivers with 40mV hysteresis. |
| 16 | N/C | unconnected | No internal connection. |
| 17 | +E/A | output | Error amplifier output, sourcing 5-11mA or sinking 20-50mA maximum, output voltage 13-13.6V high or -14.8 to -13V low. |
| 18 | -E/A | passive | Oscillator charging current terminal for internal current source, maximum charging current -2mA absolute maximum. |
| 19 | E/A OUTPUT | output | Error amplifier output connection in SOIC-20 variant. |
| 20 | ISET | passive | Oscillator current setting terminal, internally driven by buffered +VTH voltage for frequency control. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-20 |
| Category | Motor Driver ICs |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `UC2637DWTR`
- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`
- 3D model: SOIC-20 (KiCad packages3D, STEP)
- 3D model files: `uc2637dwtr-etched.step` / `uc2637dwtr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc2637dwtr.step` / `uc2637dwtr.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/uc3637) (19 pp, sha256 `50b7541e6f18a862`, retrieved 2026-09-26, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/uc2637dwtr-datasheet.pdf)