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Surface-Mount Stepper Motor Driver Comparison — NEMA 8 (Adafruit #4411 / DigiKey 15228-4411-ND)
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Motor: 3.9 V, 600 mA, Bipolar, 200 steps/rev, NEMA 8 frame | Control MCU: ESP32 (3.3 V logic) | Design: Custom KiCad PCB | Motor supply target: 5–12 V
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SPECIFICATIONDRV8428PWPR
(Texas Instruments)
DigiKey: DRV8428PWPR		A4953ELJTR-T
(Allegro MicroSystems)
DigiKey: 620-1428-1-ND		A4950ELJTR-T
(Allegro MicroSystems)
DigiKey: 620-1400-1-ND
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Driver TypeBipolar stepper, integrated current senseFull-bridge DC / brushed stepper (single bridge)Full-bridge DC / brushed stepper (single bridge)
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Motor Architecture SupportBipolar stepper (2-coil, 4-wire) — dedicatedDC brush motor or one H-bridge of a stepper (needs 2× ICs for bipolar stepper)DC brush motor or one H-bridge of a stepper (needs 2× ICs for bipolar stepper)
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Logic / VCC Supply3.3 V – 5 V ✅ ESP32 compatible3.3 V – 5 V ✅ ESP32 compatible3.3 V – 5 V ✅ ESP32 compatible
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Motor Supply Voltage (VM / VBB)4.2 V – 33 V ✅ Fits 5–12 V target8 V – 40 V ⚠ Min 8 V (check your supply)8 V – 40 V ⚠ Min 8 V (check your supply)
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Peak Output Current1.7 A peak / 1.0 A full-scale ✅ > 600 mA motor2.0 A peak ✅ > 600 mA motor3.5 A peak ✅ >> 600 mA motor (overspec)
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RMS / Continuous Current~700 mA RMS (thermal dependent) ✅~1.4 A cont. (thermal) ✅~2.5 A cont. (thermal) ✅
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Microstepping ResolutionFull / 1/2 / 1/4 / 1/8 / 1/16 / 1/32 / 1/64 / 1/128 / 1/256None — PWM duty-cycle only (not a microstepping indexer)None — PWM duty-cycle only (not a microstepping indexer)
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Control InterfaceSTEP/DIR ✅ Very easy with ESP32IN1/IN2 PWM + current sense (parallel)IN1/IN2 PWM + current sense (parallel)
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Current Sensing / RegulationIntegrated — no external sense resistors needed ✅External sense resistor requiredExternal sense resistor required
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Smart Tune / Auto-current DecaySmartTune™ automatic decay mode ✅ reduces tuningManual slow/fast decay via PWM timingManual slow/fast decay via PWM timing
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Package (SMT)16-pin HTSSOP (PWP) — fine-pitch SMD8-pin SOIC-EP — large, easy to solder ✅8-pin SOIC-EP — large, easy to solder ✅
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Package Size (footprint area)~23 mm² (HTSSOP-16)~29 mm² (SOIC-8-EP)~29 mm² (SOIC-8-EP)
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Thermal Pad (exposed pad)Yes (PWP) — needs thermal via for heat sinkYes (SOIC-EP) — easier hand-solderYes (SOIC-EP) — easier hand-solder
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Integrated ProtectionOCP, SCP, OTP, UVLO, crossover protectionOCP, SCP, OTP, UVLO, crossover protectionOCP, SCP, OTP, UVLO, crossover protection
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Enable / Sleep PinnSLEEP + nFAULT pins for low-power & fault detectNo dedicated sleep — use ENABLE low for coast/brakeNo dedicated sleep — use ENABLE low for coast/brake
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Number of ICs for Bipolar Stepper1 ✅ (full dual H-bridge onboard)2 required (one per coil) ⚠2 required (one per coil) ⚠
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Fab Inventory / Common in Fab LabsNot in standard Fab inventory (newer TI part)Not in standard Fab inventoryCommon in older Fab designs — A4950 widely used ✅
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KiCad Symbol AvailableYes — SnapEDA / SamacSys / KiCad nightlyYes — SnapEDA / SamacSysYes — KiCad standard library (Driver_Motor) ✅
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KiCad Footprint AvailableHTSSOP-16 in KiCad standard librariesSOIC-8-EP in KiCad standard libraries ✅SOIC-8-EP in KiCad standard libraries ✅
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Fab Lab KiCad Library (fabcloud)Not confirmed in fab.kicad_symNot confirmed in fab.kicad_symCheck fab.kicad_sym — A4950 likely present ✅
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DigiKey Price (approx.)~$2.50–$3.00 / unit (reel)~$2.00–$2.50 / unit~$1.80–$2.20 / unit
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Datasheet / Referenceti.com/product/DRV8428allegromicro.com — A4953allegromicro.com — A4950
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DigiKey Linkdigikey.com — DRV8428PWPRdigikey.com — 620-1428-1-NDdigikey.com — 620-1400-1-ND
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Best For NEMA 8 @ 600 mA?⭐⭐⭐ BEST CHOICE — purpose-built bipolar stepper, STEP/DIR, integrated sensing, 3.3 V logic, single IC⭐⭐ OK — needs 2× ICs + external sense resistors; no microstepping indexer built in⭐⭐ OK — same caveats as A4953; better fab library support but needs 2× ICs
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