STMicroelectronics STM802BD

Overview

STM802BD from STMicroelectronics is a solenoid controller IC in SO-8 package, implementing switch-mode current regulation with dual-phase (in-rush and hold) control, fixed 4.5:1 in-rush-to-hold current ratio, 64 ms in-rush duration, and integrated gate drive voltage clamp at 11 V typ. It enables precise solenoid actuation in automotive door locks.

For engineers reviewing the STM802BD datasheet, STM802BD pinout, STM802BD application, or STM802BD equivalent, key selection considerations include its 8–35 V DC supply range, logic-controlled enable input with hysteresis, internally trimmed 2 µs feedback filter, no external timing capacitor requirement, and built-in power-on reset for robust system initialization.

Technical Context

The STM802BD integrates a precision timing oscillator and digital in-rush timer to autonomously manage two distinct current phases without external timing components. Its feedback loop includes a 2 µs RC filter for noise immunity, and the gate driver features a clamped 11 V output to protect external MOSFETs under high-VCC conditions.

Control is implemented via a single logic-level EN pin with 0.3 V hysteresis and defined thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V), enabling direct interface with microcontrollers. The device operates across −40 °C to +85 °C and uses internal references V1 = 345 mV (in-rush) and V2 = 77 mV (hold) to set current levels.

Key Specifications

Pinout & Package

STM802BD is housed in an SO-8 surface-mount package (5.0 × 4.0 mm body, 1.27 mm pitch), with exposed pad not electrically connected. Pin 1 (TST) is test-only and must remain floating in normal operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar solenoid controller applications.

Compared with TLE6240GP and VNQ5E050AKTR-E, the STM802BD uniquely delivers fully autonomous dual-phase current control with zero external timing components-reducing design effort and PCB area where deterministic, self-contained solenoid actuation is critical.

Availability

STM802BD is available at Aetrix Electronics and suitable for automotive door locks, industrial valve actuators, office equipment feed mechanisms, and appliance water inlet systems requiring stable component supply and long-term production continuity.

Supply support for STM802BD 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, designing and manufacturing analog, mixed-signal, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The STM802 series belongs to ST's dedicated power interface IC portfolio, engineered specifically for electromagnetic actuator control with emphasis on reliability, integration, and reduced external component count in harsh environments.

FAQ

What is the function of the TST pin on STM802BD?

The TST pin is exclusively for factory wafer-level testing and has no functional role in end-user applications. It must be left unconnected (floating) in all operational circuits. Connecting it to any voltage or ground may disrupt internal biasing and cause undefined behavior or failure to regulate current correctly.

Can STM802BD drive a P-channel MOSFET instead of an N-channel device?

No - the GATE output is designed as a push-pull driver referenced to VCC and optimized for N-channel MOSFET gate drive with 11 V clamp. Driving a P-channel MOSFET would require inversion, level shifting, and reverse polarity handling not supported by the internal architecture. Only N-channel external MOSFETs are compatible.

How does the STM802BD achieve in-rush timing without external capacitors?

It uses an internally trimmed RC oscillator combined with a digital counter that increments at a fixed rate derived from the oscillator. The counter triggers state transitions (in-rush → hold) after exactly 64 ms, eliminating dependency on external passive components and their associated tolerance and temperature drift.

Is STM802BD still in active production or obsolete?

STM802BD is marked as obsolete by STMicroelectronics per official documentation, but Aetrix Electronics maintains legacy inventory and offers extended supply support including last-time buy coordination, cross-reference assistance, and engineering guidance for migration to functionally aligned alternatives such as the TLE6240GP.