component
A3906SESTR-T
Public Made by Adomby adom
Allegro MicroSystems LLC Stepper Motor Driver, QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownA3906SESTR-T
Allegro MicroSystems LLC · Stepper Motor Driver · QFN-20-EP(4x4)
A3906SESTR-T from Allegro MicroSystems LLC, in a QFN-20-EP(4x4). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CP2 | passive | Charge pump capacitor terminal 2; connect 0.1 μF ceramic capacitor between CP1 and CP2. |
| 2 | GND | power_in | Ground; low impedance connection to PCB ground plane. |
| 3 | SLEEP | input | Sleep logic input (active low); logic low disables output drivers and internal circuitry. |
| 4 | IN1 | input | Control input for bridge 1; accepts logic signals in range 0 to 5.5 V. |
| 5 | IN2 | input | Control input for bridge 1; accepts logic signals in range 0 to 5.5 V. |
| 6 | IN3 | input | Control input for bridge 2; accepts logic signals in range 0 to 5.5 V. |
| 7 | IN4 | input | Control input for bridge 2; accepts logic signals in range 0 to 5.5 V. |
| 8 | FL1 | tri_state | Current limit flag output for bridge 1; pulled low when peak current in motor winding reaches threshold determined by sense resistor. |
| 9 | FL2 | tri_state | Current limit flag output for bridge 2; pulled low when peak current in motor winding reaches threshold determined by sense resistor. |
| 10 | OUT2A | output | DMOS full-bridge 2 output A; source or sink output current up to 1 A continuous. |
| 11 | SENSE2 | input | Current sense input for bridge 2; analog voltage input maximum 0.5 V continuous or 1 V pulsed. |
| 12 | OUT2B | output | DMOS full-bridge 2 output B; source or sink output current up to 1 A continuous. |
| 13 | VBB | power_in | Supply voltage input; operating range 2.5 to 9 V for motor drive supply. |
| 14 | OUT1B | output | DMOS full-bridge 1 output B; source or sink output current up to 1 A continuous. |
| 15 | SENSE1 | input | Current sense input for bridge 1; analog voltage input maximum 0.5 V continuous or 1 V pulsed. |
| 16 | OUT1A | output | DMOS full-bridge 1 output A; source or sink output current up to 1 A continuous. |
| 17 | VCP | passive | Reservoir capacitor terminal; connect 0.1 μF ceramic capacitor between VCP and VBB for high-side gate drive supply. |
| 18 | CP3 | passive | Charge pump capacitor terminal 3; connect 0.1 μF ceramic capacitor between CP3 and CP4. |
| 19 | CP1 | passive | Charge pump capacitor terminal 1; connect 0.1 μF ceramic capacitor between CP1 and CP2. |
| 20 | CP4 | passive | Charge pump capacitor terminal 4; connect 0.1 μF ceramic capacitor between CP3 and CP4. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Allegro MicroSystems LLC |
| Package | QFN-20-EP(4x4) |
| Category | Motor Driver ICs |
| Pins | 21 |
CAD (KiCad official)
- Symbol:
A3906SESTR-T - Footprint:
Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm - 3D model: QFN-20-EP(4x4) (KiCad packages3D, STEP)
- 3D model files:
a3906sestr-t-etched.step/a3906sestr-t-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);a3906sestr-t.step/a3906sestr-t.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Allegro MicroSystems LLC datasheet (10 pp, sha256
7937a27a62d2477e, retrieved 2026-09-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).