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A3901SEJTR-T

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Allegro MicroSystems LLC Stepper Motor Driver, DFN-10-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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A3901SEJTR-T

Allegro MicroSystems LLC · Stepper Motor Driver · DFN-10-EP(3x3)

A3901SEJTR-T from Allegro MicroSystems LLC, in a DFN-10-EP(3x3). 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 IN1 input Logic input 1 controls bridge 1; it is 3 to 5 V logic compatible, with VIN(1) min of VBB/2, VIN(0) max of 0.5 V, and an absolute maximum input range of -0.3 to 6 V.
2 IN2 input Logic input 2 controls bridge 1; it is 3 to 5 V logic compatible, with VIN(1) min of VBB/2, VIN(0) max of 0.5 V, and an absolute maximum input range of -0.3 to 6 V.
3 GND power_in Ground terminal for the device, to be connected to the exposed thermal pad externally.
4 IN3 input Logic input 3 controls bridge 2; it is 3 to 5 V logic compatible, with VIN(1) min of VBB/2, VIN(0) max of 0.5 V, and an absolute maximum input range of -0.3 to 6 V.
5 IN4 input Logic input 4 controls bridge 2; it is 3 to 5 V logic compatible, with VIN(1) min of VBB/2, VIN(0) max of 0.5 V, and an absolute maximum input range of -0.3 to 6 V.
6 OUT4 output Bridge 2 output to load, rated up to ±400 mA per channel (±800 mA when outputs are paralleled), subject to duty cycle, ambient temperature and heat sinking.
7 OUT3 output Bridge 2 output to load, rated up to ±400 mA per channel (±800 mA when outputs are paralleled), subject to duty cycle, ambient temperature and heat sinking.
8 VBB power_in Load supply terminal, operating from 2.5 to 5.5 V with an absolute maximum load supply voltage of 7 V.
9 OUT2 output Bridge 1 output to load, rated up to ±400 mA per channel (±800 mA when outputs are paralleled), subject to duty cycle, ambient temperature and heat sinking.
10 OUT1 output Bridge 1 output to load, rated up to ±400 mA per channel (±800 mA when outputs are paralleled), subject to duty cycle, ambient temperature and heat sinking.
11 PAD passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Allegro MicroSystems LLC
Package DFN-10-EP(3x3)
Category Motor Driver ICs
Pins 11

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Load Supply Voltage VBB 7 V 2
Output Current per Channel IOUT 400 mA 2
Logic Input Voltage Range VIN -0.3 6 V 2
Junction Temperature TJ 150 °C 2
Storage Temperature Range Tstg -55 150 °C 2
Operating Temperature Range TA -20 85 °C 2
Operating Load Supply Voltage (EC header range) VBB 2.5 5.5 V TA = 25°C, unless noted otherwise 4
Output On Resistance, source driver RDS(on) 1 1.8 2.2 Ω Source driver, VBB = 3 V, IOUT = 300 mA 4
Output On Resistance, source driver RDS(on) 1 1.2 1.4 Ω Source driver, VBB = 5 V, IOUT = 300 mA 4
Output On Resistance, sink driver RDS(on) 0.5 1.2 1.4 Ω Sink driver, VBB = 3 V, IOUT = 300 mA 4
Output On Resistance, sink driver RDS(on) 0.5 0.8 1 Ω Sink driver, VBB = 5 V, IOUT = 300 mA 4
Clamp Diode 1.5 V I = 300 mA 4
Motor Supply Current sleep mode, VBB = 3 V IBB 100 nA Sleep mode, VBB = 3 V 4
Motor Supply Current sleep mode, VBB = 5 V IBB 500 nA Sleep mode, VBB = 5 V 4
Logic Input Voltage, logic low VIN(0) 0.5 V 4
Logic Input Current, logic high IIN(1) 500 nA VIN = 2.0 V 4
Logic Input Current, logic low IIN(0) -500 nA VIN = 0.5 V 4
Motor Supply Current IBB 0.6 mA All outputs PWMed at 20 kHz 4
Input Voltage Hysteresis Vhys 150 mV 4
Propagation Delay, turn-on tpd(on) 130 ns Input Low to Sink On, Input High to Source On 4
Propagation Delay, turn-off tpd(off) 50 ns Input High to Sink Off, Input Low to Source Off 4
Crossover Delay tCOD 80 ns 4
Thermal Shut Down Temperature TJ 150 °C 4
Thermal Shut Down Hysteresis TJhys 10 °C 4
Package Thermal Resistance RθJA 45 °C/W Measured on 4-layer board based on JEDEC standard 4
Package Thermal Resistance RθJA 65 °C/W Measured on 2-layer board with copper limited to solder pads and 0.88 in2 of copper on each side 4

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin (package “EJ”). This small footprint package is lead (Pb) free, with 100% matte tin leadframe plating. 1

CAD (KiCad official)

  • Symbol: A3901SEJTR-T
  • Footprint: Package_DFN_QFN:DFN-10-1EP_3x3mm_P0.5mm_EP1.55x2.48mm
  • 3D model: DFN-10-EP(3x3) (KiCad packages3D, STEP)
  • 3D model files: a3901sejtr-t-etched.step / a3901sejtr-t-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); a3901sejtr-t.step / a3901sejtr-t.glb are the bare package body.

Provenance

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

  • Datasheet: Allegro MicroSystems LLC datasheet (12 pp, sha256 a40f5dda70311158, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (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