AMIS30542 - Micro-Stepping Stepper Motor Driver | onsemi
MPN: AMIS30542 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.4 | $6.40 |
| 10 | $5.78 | $57.80 |
| 100 | $5.12 | $512.00 |
| 500 | $4.55 | $2,275.00 |
| 1,000 | $3.98 | $3,980.00 |
AMIS30542 Overview
A stepper motor driver is a power-management IC that translates low-power step/direction commands from a microcontroller into the high-current, sequenced phase currents needed to rotate a bipolar stepper motor by a precise mechanical increment. In the broader power-management hierarchy, stepper drivers sit below general motor drivers and above simple MOSFET H-bridges, combining power-stage, current-sense, and motion-control logic in one IC. The micro-stepping category adds sinusoidal current shaping so each full step is divided into smaller sub-steps, eliminating resonance, reducing audible noise, and improving positional accuracy.
Key features of the AMIS30542 include active fly-back diodes (eliminating external recirculation diodes in most applications), integrated thermal warning and thermal shutdown, full output short-to-ground/short-to-supply protection and open-load diagnostics, and a dedicated "speed and load angle" (SLA) pin that provides real-time back-EMF feedback for stall detection or torque monitoring. Communication to the host MCU is handled through a standard 4-wire SPI interface for current limit, micro-step resolution, decay mode, and direction configuration.
The internal architecture uses a mixed-signal controller with a programmable current-translation table, dual DMOS H-bridges, and a charge-pump gate supply for the high-side N-channel FETs. The integrated 5 V LDO can supply an external microcontroller (up to 50 mA typical), and the dedicated reset/watchdog block simplifies system design for automotive and industrial mechatronic modules.
Typical applications include automotive headlamp leveling and adaptive front lighting, HVAC damper and valve actuators, industrial CNC feeder axes, 3D printer and labeling machine stepper axes, robotics joint actuation, and medical infusion-pump drives. The wide operating voltage range and on-chip diagnostics make the part particularly well-suited to 12 V/24 V automotive and industrial environments.
When designing with this part, ensure the SLA pin is correctly decoded to avoid false stall events at low speeds. The integrated charge pump requires external flying capacitors (Ccp1, Ccp2) and a reservoir capacitor on VCP, which must be placed close to the IC. Always respect the maximum phase current of 1500 mA RMS and provide adequate PCB copper for thermal dissipation - the exposed thermal pad must be soldered to a ground copper pour.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for AMIS30542 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AMIS30542 (same form factor and footprint) — differing in Package, Control Interface, MSL Level, Operating Temperature Range, Protection Features.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AMIS30542C5421RG
✅ Drop-In📋 Reference alternative (not in catalog)
AMIS30543C5421RG
✅ Drop-In📋 Reference alternative (not in catalog)
AMIS30521C5421RG
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
DRV8846RGER
✅ Drop-In📋 Reference alternative (not in catalog)
L6470H
✅ Drop-In✓ In Stock
$2.372 / Unit
View Datasheet →AMIS30542 Maximum Ratings & Electrical Characteristics
| Motor Type | Bipolar stepper motor |
| Output Configuration | Dual H-bridge (4 half-bridges) |
| Maximum Phase Current (RMS) | 1500 mA |
| Motor Supply Voltage (VBB) | 6 V to 30 V |
| Logic Supply Voltage (VDD) | 3.3 V or 5 V |
| Micro-Step Resolution | Up to 1/32 step (programmable via SPI) |
| On-Chip 5 V Regulator Output | 5 V (for external MCU, up to ~50 mA) |
| Communication Interface | SPI (4-wire, plus NXT/DIR pins) |
| Integrated Fly-back Diodes | Yes (active fly-back) |
| Thermal Protection | Thermal warning + thermal shutdown |
| Diagnostic Features | Short-to-ground, short-to-supply, open-load detection |
| SLA (Speed/Load Angle) Output | Yes (transparent back-EMF monitor) |
| Operating Temperature Range | -40 C to +125 C |
| Package | NQFP-32 (7x7 mm) |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
AMIS30542 Pin Configuration
| Pin 1 | VDD — Logic supply (3.3 V or 5 V) |
| Pin 2 | GND — Ground |
| Pin 3 | DOUT — SPI data output (to MCU MISO) |
| Pin 4 | DIN — SPI data input (from MCU MOSI) |
| Pin 5 | CLK — SPI clock |
| Pin 6 | CS — SPI chip select (active low) |
| Pin 7 | NXT — Next micro-step input |
| Pin 8 | DIR — Direction input / register bit |
| Pin 9 | SLA — Speed and Load Angle output |
| Pin 10 | RESET — Reset output to external MCU |
| Pin 11 | WDO — Watchdog output |
| Pin 12 | VDD5V — Internal 5 V regulator output |
| Pin 13 | VCP — Charge-pump reservoir |
| Pin 14 | CPC1 — Charge-pump flying capacitor 1 |
| Pin 15 | CPC2 — Charge-pump flying capacitor 2 |
| Pin 16 | VBB — Motor supply (6 V-30 V) |
| Pin 17 | PGND — Power ground |
| Pin 18 | OUT1A — Phase A output 1 |
| Pin 19 | OUT1B — Phase A output 2 |
| Pin 20 | SENSE1 — Phase A current sense resistor |
| Pin 21 | NC — Not connected (per datasheet) |
| Pin 22 | NC — Not connected (per datasheet) |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
| Pin 25 | SENSE2 — Phase B current sense resistor |
| Pin 26 | OUT2A — Phase B output 1 |
| Pin 27 | OUT2B — Phase B output 2 |
| Pin 28 | PGND — Power ground |
| Pin 29 | VBB — Motor supply (6 V-30 V) |
| Pin 30 | NC — Not connected (per datasheet) |
| Pin 31 | NC — Not connected (per datasheet) |
| Pin 32 | EP — Exposed thermal pad (connect to GND pour) |
Typical Applications
AMIS30542 is suitable for 6 applications: Automotive Headlamp Leveling and Adaptive Front Lighting, HVAC Damper and Valve Actuators, Industrial CNC Feeder and Conveyor Axes, 3D Printer Stepper Axes (X/Y/Z and Extruder), Medical Infusion Pump and Lab Automation Drives, Robotics Joint Actuation and Pan-Tilt Platforms.
Automotive Headlamp Leveling and Adaptive Front Lighting
The AMIS30542's 6-30 V motor supply range, integrated active fly-back diodes, and on-chip 5 V regulator make it an ideal match for 12 V and 24 V automotive headlamp leveling stepper actuators. Driving a bipolar stepper up to 1500 mA RMS phase current, the part delivers the torque required to move projector lenses through their full vertical/horizontal travel while supporting SPI-programmed micro-stepping up to 1/32 step for ultra-smooth motion. The SLA pin enables real-time stall detection - critical when a lens mechanism encounters ice or debris - and the on-chip thermal warning/shutdown plus short/open-load diagnostics allow the part to satisfy automotive safety requirements without external protection.
Recommended
HVAC Damper and Valve Actuators
In HVAC zone damper and valve actuators, the AMIS30542 drives a small bipolar stepper that opens or closes an airflow damper proportionally to a thermostat command. Its SPI interface lets the host MCU set micro-step position precisely, while the integrated 5 V LDO can power the MCU directly, reducing the BOM of the mechatronic module. With 1500 mA RMS phase current capability and active fly-back diodes, the part handles the inductive kickback of typical 12 V/24 V damper steppers reliably. The on-chip open-load and short-to-ground diagnostics enable predictive maintenance alerts, which is increasingly required in modern commercial HVAC systems.
Recommended
Industrial CNC Feeder and Conveyor Axes
The AMIS30542 is well-matched to small industrial CNC feeder and conveyor stepper axes where precise positioning and reliable diagnostics are mandatory. Its 1/32 micro-stepping produces smooth motion at low RPMs, reducing vibration and improving the surface finish of small machined parts. The integrated SLA back-EMF output allows closed-loop stall detection - essential for protecting tooling and workpieces during feed jams. Operating from a wide 6-30 V motor supply, the part accepts 24 V industrial bus rails directly, and the SPI interface enables central PLCs or motion controllers to configure current limit and decay mode per axis.
Recommended
3D Printer Stepper Axes (X/Y/Z and Extruder)
For 3D printers, the AMIS30542 drives NEMA 17 bipolar steppers on X, Y, and Z axes plus the extruder with up to 1500 mA RMS per phase. Programmable 1/32 micro-stepping through SPI eliminates the banding artifacts visible at lower micro-step resolutions, while the integrated fly-back diodes and charge pump remove the need for bulky external components - critical in the tight enclosures of consumer 3D printers. The part's SLA pin can be repurposed for filament-runout sensing or crash detection, and its 3.3 V/5 V logic compatibility lets it pair directly with common 32-bit printer controller boards running Marlin or Klipper firmware.
Recommended
Medical Infusion Pump and Lab Automation Drives
In medical infusion pumps and laboratory automation, the AMIS30542 drives the small bipolar stepper that advances a syringe or rotary valve with sub-millimeter precision. Its SPI-programmable current shaping lets designers tune torque and smoothness for the specific fluid viscosity, and the SLA pin provides a redundant stall indication to detect occlusion events - a critical safety feature in infusion devices. The on-chip 5 V LDO and watchdog-reset block simplify the host subsystem, while integrated short/open-load diagnostics help satisfy IEC 60601-1 risk-management requirements. The -40 C to +125 C operating range supports a wide range of clinical and laboratory environments.
Recommended
Robotics Joint Actuation and Pan-Tilt Platforms
The AMIS30542 enables compact, low-cost robotics joint actuators and pan-tilt camera platforms where space and weight are at a premium. Driving bipolar steppers up to 1500 mA RMS, it provides enough torque for camera gimbals, robot arms, and small humanoid joints while maintaining SPI-configurable micro-step resolution for smooth, lifelike motion. The integrated charge pump, gate drivers, and fly-back diodes eliminate the need for external components, allowing the entire drive stage to fit on a small PCB alongside the MCU. The SLA pin's transparent back-EMF monitoring supports torque-aware motion control without dedicated current-sense amplifiers.
Recommended
Recommended Products Summary
Engineering reference data for AMIS30542 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AMIS30542C5421RG | AMIS30543C5421RG | AMIS30521C5421RG | DRV8846RGER | L6470H |
|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | onsemi | onsemi | Texas Instruments | STMicroelectronics |
| Package | NQFP-32 (7x7) | NQFP-32 (7x7) - same | NQFP-32 (7x7) - same | NQFP-32 (7x7) - same | VQFN-36 (5x5) - similar fine-pitch QFN | HTSSOP-28 - smaller but pinout differs |
| Maximum Phase Current (RMS) | 1500 mA | 1500 mA | 1500 mA | 800 mA | 1500 mA | 1500 mA |
| Motor Supply Voltage | 6 V to 30 V | 6 V to 30 V | 6 V to 30 V | 6 V to 30 V | 2.5 V to 32 V | 8 V to 45 V |
| Micro-Step Resolution | Up to 1/32 step | Up to 1/32 step | Up to 1/32 step | Up to 1/32 step | Up to 1/32 step | Up to 1/128 step |
| Integrated Fly-back Diodes | Yes (active) | Yes (active) | Yes (active) | Yes (active) | Yes | Yes |
| On-Chip 5 V Regulator | Yes | Yes | Yes | Yes | No | Yes (3.3 V) |
| SLA / Stall Feedback | Yes (SLA pin) | Yes | Yes | Yes | Yes (IPROPI) | Yes (internal) |
| Communication Interface | SPI + NXT/DIR | SPI + NXT/DIR | SPI + NXT/DIR | SPI + NXT/DIR | SPI + STEP/DIR | SPI |
| Unit Price (qty 1, USD, as of 2026-10-06) | $6.40 | $6.40 | $6.55 | $5.20 | $4.10 | $7.80 |
Key Differentiators
- Integrated active fly-back diodes and on-chip 5 V LDO (vs DRV8846RGER)
- Higher micro-step resolution for ultra-smooth motion (vs AMIS30521C5421RG)
- Lower motor supply voltage optimized for 12 V/24 V automotive/industrial (vs L6470H)
Design Notes
Estimated: at VBB=24 V, Vphase_avg=12 V, and 1500 mA RMS per phase with both phases active, total on-chip dissipation reaches roughly 1.5 W. With the exposed thermal pad soldered to at least 6 cm^2 of 2 oz copper on a 4-layer FR-4 board (theta_JA ~ 30 C/W typical), junction temperature rises ~45 C above ambient. Above 1 A RMS per phase, always measure the case temperature in your specific PCB layout and add a copper heatsink or thermal vias to ground pours if Tj exceeds 110 C at max ambient.
Place the charge-pump flying capacitors (Ccp1, Ccp2 ~100 nF) and the VCP reservoir capacitor (~220 nF) within 3 mm of the IC pins, using short, wide traces. The exposed thermal pad must be soldered to a continuous ground copper pour with at least 8 thermal vias to the inner ground plane. Keep the high-current OUT1/OUT2 traces short and pair them with a ground return to minimize parasitic inductance that could stress the active fly-back diodes during PWM switching.
Do not exceed 1500 mA RMS per phase or you may trigger thermal shutdown at elevated ambient temperatures. The SLA pin output is a high-impedance analog signal - buffer it with an external op-amp if your MCU ADC input cannot tolerate the full VBB transient voltage. Avoid using the SPI bus above 1 MHz without verifying signal integrity on long PCB traces; add a 33 ohm series resistor near the CS pin to dampen ringing. Finally, ensure VBB has at least 100 uF of bulk capacitance close to the IC to absorb motor back-EMF.
Compliance Information
RoHS and REACH compliant per onsemi product page. AEC-Q100 not explicitly stated - check the AMIS-30542-Q1 suffix variant for automotive-qualified versions. Halogen-free status not confirmed in verified data - set to unknown.
