STMicroelectronics VBG08H-E

Overview

VBG08H-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 HV collector clamping, thermal shutdown at 150°C, and soft shut-down (SSD) triggered by thermal fault, input overvoltage, or battery overvoltage - designed for engine control unit (ECU) spark timing in gasoline engines.

For engineers reviewing the VBG08H-E datasheet, VBG08H-E pinout, VBG08H-E application, or VBG08H-E equivalent, this device supports precise coil current limiting with diagnostic flag output, slow turn-on to suppress parasitic sparks, and battery-fault-tolerant operation across 6–28 V supply - critical for robust ECU design under ISO 7637-2/16750-2 transients.

Technical Context

The VBG08H-E implements a monolithic IGBT gate driver with integrated current sensing and thermal monitoring. Its Slow Turn-On (STO) circuit controls dV/dt during IGBT turn-on to prevent false spark generation, while the Low Voltage Clamp (LVC) enables controlled coil energy discharge during SSD events.

SSD activation is governed by logical OR of multiple fault inputs: junction temperature >150°C, EN pin high during conduction, INP voltage >9 V, or VS >32 V. The current flag (C.F.) provides open-drain diagnostic output that transitions low after filtering when coil current reaches 6.5 A ±0.65 A across –40°C to 150°C.

Key Specifications

Pinout & Package

The VBG08H-E is housed in the OctaPAK® package - a thermally enhanced, isolated power module with dual PGND pins and exposed HVC collector tab for direct heatsinking. Pin layout follows standardized top-view configuration per Figure 2 of ST DocID024413 Rev 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VBG08H-E, VBG10HTR-E offers higher current headroom in identical form factor, while STGD3HF60 requires external sensing and protection circuitry - making VBG08H-E optimal for new ECU designs needing compact, self-contained ignition drive with diagnostics.

Availability

VBG08H-E is available at Aetrix Electronics and suitable for gasoline engine ignition systems, coil-on-plug modules, and ISO 16750-2-compliant automotive ECUs requiring stable component supply across extended temperature and voltage ranges.

Supply support for VBG08H-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 specializing in automotive-grade power ICs, microcontrollers, and sensors - with over 30 years of automotive qualification experience and AEC-Q100 certification across product lines.

The VBG series targets high-reliability automotive ignition systems, combining intelligent power switching, embedded diagnostics, and ruggedized packaging to meet stringent OEM requirements for spark timing accuracy and functional safety.

FAQ

What is the purpose of the Slow Turn-On (STO) circuit in VBG08H-E?

The Slow Turn-On circuit controls the dV/dt rate at the HVC pin during IGBT turn-on to suppress unwanted spark generation caused by parasitic capacitive coupling in the ignition coil. It ensures clean, deterministic spark timing by preventing false triggering during the initial negative dV/dt phase, as confirmed in Figure 5 and Section 1.1 of the datasheet.

How does the Soft Shut-Down (SSD) function respond to thermal overload?

When junction temperature exceeds 150°C, the thermal shutdown (TSD) circuit activates SSD, engaging the Low Voltage Clamp (LVC) to hold HVC at VS+10 V. This enables controlled coil current decay without secondary-side voltage overshoot. Recovery requires junction temperature to fall below 133°C (150°C – 17°C hysteresis) before normal operation resumes.

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

Yes - the C.F. pin provides a temperature-compensated, open-drain signal that transitions low when coil current reaches 6.5 A ±0.65 A. With appropriate external pull-up and MCU interrupt handling, it enables precise dwell time termination based on actual current rather than fixed timing, improving spark consistency across battery voltage and temperature variations.

Is the VBG08H-E compatible with 48 V mild-hybrid vehicle architectures?

No - the VBG08H-E is specified for 6–28 V operation with VS overvoltage shutdown at 32 V. It lacks native 48 V tolerance and is not qualified for 48 V system transients. For mild-hybrid applications, ST recommends evaluating the VBG12H or other members of the newer VBG-X series explicitly rated for 48 V battery systems.