STMicroelectronics STSPIN233

Overview

STSPIN233 from STMicroelectronics is a protected triple half-bridge motor driver IC designed for low-voltage three-phase brushless DC (BLDC) motor control in battery-powered systems. It operates from 1.8 V to 10 V, delivers up to 1.3 Arms continuous output current per bridge, features 0.4 Ω typical total R_DS(ON) (HS + LS), and supports three-shunt current sensing. It is used in portable gimbals, drones, and low-voltage electronic valves.

For engineers reviewing the STSPIN233 datasheet, STSPIN233 pinout, STSPIN233 application, or STSPIN233 equivalent, key selection considerations include its ultra-low standby current (<80 nA), integrated non-dissipative overcurrent protection, thermal shutdown at 160 °C, and direct logic-level IN/EN control per half-bridge - critical for space-constrained, energy-sensitive BLDC designs.

Technical Context

The STSPIN233 implements a fully integrated triple half-bridge power stage with independent enable and input pins for each phase (U/V/W), enabling direct commutation control without external gate drivers. Its protection architecture includes per-output short-circuit detection (to GND, VS, and phase-to-phase), non-dissipative overcurrent limiting triggered at 2 A typ., and thermal shutdown with 40 °C hysteresis.

Standby mode is activated by pulling the STBY\RESET pin below 0.9 V, cutting supply to internal logic and forcing all outputs into high-impedance state; recovery requires release above 1.48 V. Fault signaling occurs via open-drain EN\FAULT, which actively pulls low during overcurrent or thermal events and remains latched until external RC network (REN/CEN) discharges below 0.4 V.

Key Specifications

Pinout & Package

STSPIN233 is housed in a VFQFPN 3 × 3 × 1.0 mm, 16-pin thermally enhanced package with exposed pad (EPAD) for improved heat dissipation. The EPAD must be soldered to a PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple half-bridge motor driver applications.

Compared with TB67H450FNG and DRV8313, STSPIN233 uniquely balances ultra-low standby consumption (<80 nA), minimal 3 × 3 mm footprint, and native three-shunt support - making it optimal for size- and energy-critical BLDC applications under 10 V, where analog simplicity and minimal external components are prioritized.

Availability

STSPIN233 is available at Aetrix Electronics and suitable for drone propulsion, portable medical pumps, and low-voltage electronic valve actuation requiring stable component supply across long-lifecycle portable device programs.

Supply support for STSPIN233 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with strong focus on energy efficiency and reliability.

The STSPIN family targets compact, intelligent motor control solutions - specifically engineered for battery-powered and space-constrained applications requiring integrated protection, low quiescent power, and simplified PCB layout.

FAQ

What is the recommended PCB layout practice for thermal management of STSPIN233?

The VFQFPN package requires the exposed pad (EPAD) to be soldered to a dedicated PCB ground plane with ≥4 thermal vias (300 µm diameter) connecting to inner or bottom-layer copper. ST specifies a 21.2 × 21.2 mm 2s2p board with 1 oz copper for R_thJA = 57.1 °C/W. Avoid floating EPAD or insufficient copper area, as this degrades R_thJCbot (9.1 °C/W) and risks thermal shutdown under 1.3 A load.

How does the STSPIN233 implement non-dissipative overcurrent protection?

It monitors voltage drop across internal power FETs during conduction - detecting excessive current without external sense resistors. When sensed current exceeds 2 A (typ.), the affected half-bridge is immediately disabled and EN\FAULT is pulled low. No power is dissipated in a shunt resistor, preserving efficiency and eliminating associated heat and layout complexity.

Can STSPIN233 drive sensorless BLDC motors, and what external components are mandatory?

Yes - it supports sensorless commutation when paired with an external MCU that implements back-EMF zero-crossing detection. Mandatory external components include: decoupling capacitors (CS = 2.2 µF, CSPOL = 22 µF), three shunt resistors (RSNSU/V/W = 330 mΩ), and the REN/CEN network (18 kΩ / 10 nF) for fault recovery timing. No bootstrap capacitors or external gate drivers are needed.

What happens during simultaneous assertion of STBY\RESET and EN\FAULT low conditions?

STBY\RESET takes precedence: if pulled below 0.9 V, the device enters full standby - disabling all logic, power stage, and fault circuitry - regardless of EN\FAULT state. EN\FAULT remains high-impedance during standby. Upon STBY\RESET release (>1.48 V), the device resets and resumes normal operation, with EN\FAULT then active for fault reporting.