STMicroelectronics VBG08HTR-E

Overview

VBG08HTR-E from STMicroelectronics is a single-channel automotive ignition coil driver IC integrating an IGBT power stage and current-sensing shunt in Chip-on-Chip (COC) hybrid construction within an OctaPAK® package. It delivers 8 A nominal coil current, features 360 V internal high-voltage clamp, thermal shutdown at 150°C, and soft shut-down (SSD) triggered by thermal, input overvoltage, or battery overvoltage faults - designed for electronic control unit (ECU) spark timing in gasoline engines.

For engineers reviewing the VBG08HTR-E datasheet, VBG08HTR-E pinout, VBG08HTR-E application, or VBG08HTR-E equivalent, key selection considerations include its integrated coil current limiter (10.5 A), SSD activation logic via low-voltage clamp (LVC), EN-pin–controlled enable/disable sequencing, slow turn-on (STO) to suppress spurious sparks, and open-drain current flag (C.F.) output with 6.5 A threshold.

Technical Context

The device implements a dual-stage protection architecture: primary current limiting (10.5 A at Tj < 125°C) combined with thermal shutdown (TSD = 150°C ± hysteresis) that triggers soft shut-down via a low-voltage clamp circuit (LVC), clamping VHVC to VS + 10 V (typ). The LVC activates on logical OR of fault conditions - thermal intervention, EN pin high during ON-state, INP overvoltage (>9 V), or battery overvoltage (>32 V).

Control logic uses TTL-compatible inputs: INP drives IGBT switching (low-to-high = turn-on, high-to-low = turn-off), while EN enables/disables the entire power stage (internal pull-up disables by default). The C.F. pin provides filtered open-drain diagnostic feedback when coil current reaches 6.5 A (±0.65 A over temperature), with 16/fCLK filtering time (fCLK = 2 MHz typ).

Key Specifications

Pinout & Package

VBG08HTR-E is housed in the OctaPAK® package - a thermally enhanced, isolated power module with integrated heatsink tab and eight external terminals plus HVC collector tab. The package supports high-current conduction (8 A continuous), low thermal resistance (R_thj-case = 0.55°C/W), and automotive-grade creepage/clearance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ignition coil driver applications.

Compared with VBG08HTR-E, VBG10HTR-E offers higher energy handling but identical control interface and protection architecture, while STGD3HF60 shifts system-level protection responsibility to the MCU - increasing validation effort and reducing fault coverage.

Availability

VBG08HTR-E is available at Aetrix Electronics and suitable for automotive ECU production, ignition system repair modules, and engine diagnostic equipment requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle continuity.

Supply support for VBG08HTR-E 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, power, and microcontroller technologies with over 40 years of automotive qualification experience.

VBG08HTR-E belongs to ST's Automotive Smart Power family, engineered specifically for high-reliability, high-energy ignition systems in gasoline powertrains - emphasizing integrated protection, diagnostic capability, and thermal robustness under harsh operating conditions.

FAQ

What is the purpose of the Slow Turn-On (STO) circuit in VBG08HTR-E?

The Slow Turn-On circuit controls the dV/dt at the IGBT collector (HVC) during turn-on to suppress unintended pre-spark discharges caused by rapid negative voltage transients on the ignition coil primary. It ensures clean, deterministic spark initiation by limiting initial voltage slew rate to 0.1–1 V/µs, preventing electromagnetic interference and false triggering in adjacent circuits.

How does the Soft Shut-Down (SSD) function respond to battery overvoltage?

When VS exceeds 32 V for longer than 220 µs (e.g., during ISO 7637-2 Pulse 5b load dump), VBG08HTR-E activates SSD: the LVC clamps VHVC to VS + 10 V, initiating controlled coil current decay. The device remains disabled until VS falls below 29.5 V (32 V – 2.5 V hysteresis), after which normal operation resumes only upon a new low-to-high INP transition.

Can the current flag (C.F.) output be used for closed-loop dwell time control?

Yes - the C.F. pin asserts low when coil current reaches 6.5 A (±0.65 A over temperature), providing a precise, filtered timing reference independent of battery voltage or coil aging. Microcontrollers can use this edge to terminate dwell time dynamically, ensuring consistent spark energy across operating conditions without external current sensors.

What is the significance of dual PGND pins (PGND1 and PGND2) in the OctaPAK package?

PGND1 and PGND2 provide separate, low-inductance return paths for high di/dt currents: PGND1 serves the IGBT emitter, while PGND2 supports auxiliary power grounds. This separation minimizes ground bounce, improves current sharing under transient loads, and enhances thermal distribution across the copper baseplate - critical for maintaining SOA compliance during repeated spark events.