STMicroelectronics VB027(6)-E

Overview

VB027(6)-E from STMicroelectronics is a high-voltage ignition coil driver power IC fabricated in VIPower™ technology, integrating a vertical current flow power Darlington with logic-level input compatibility. It features internally set primary coil voltage clamping (300–400 V), collector current limiting (8–9 A), and dual diagnostic flag outputs for overcurrent detection at 4.5 A and 5.8 A - used in automotive electronic ignition systems to drive high-energy ignition coils.

For engineers reviewing the VB027(6)-E datasheet, VB027(6)-E pinout, VB027(6)-E application, or VB027(6)-E equivalent, key selection criteria include its HVC output clamping behavior, quasi-proportional base current drive, thermal derating of Icl, dual-threshold diagnostic response timing (td(diag) = 1 µs), and PENTAWATT HV package thermal resistance (Rthj-case = 1.12 °C/W).

Technical Context

The VB027(6)-E operates as a smart high-side switch for automotive ignition coils, using internal Rsense-based current sensing and Zener-clamped HVC output to limit primary coil voltage during turn-off. Its protection architecture includes overtemperature detection (shifting DIAG1 threshold down ~1 A above 125 °C) and built-in collector voltage clamping with ≤20 V overshoot tolerance.

It accepts logic-level input (VINH ≥ 4 V, VINL ≤ 0.8 V), drives the coil via HVC with saturation voltage Vcg(sat) = 1.5 V at IC = 6 A, and provides two diagnostic flags (DIAG) with defined thresholds (IC(diag1) = 4.5 A, IC(diag2) = 5.8 A) and sub-microsecond response (tr(diag)/tf(diag) = 1 µs).

Key Specifications

Pinout & Package

PENTAWATT HV package: 5-pin, single-in-line (SIL), insulated metal tab for direct heatsink mounting; case material thermally conductive epoxy; outline per P023H3 mechanical drawing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage ignition driver applications.

Compared with STGD3HF60L and UC3846N, VB027(6)-E delivers fully integrated coil drive, diagnostics, and protection in one package - reducing design complexity, board space, and validation effort for conventional inductive ignition systems.

Availability

VB027(6)-E is available at Aetrix Electronics and suitable for automotive engine control units, marine ignition modules, and motorcycle CDI replacement designs requiring stable component supply and long-lifecycle support.

Supply support for VB027(6)-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, industrial, and power management ICs with vertical manufacturing capabilities.

The VB027(6)-E belongs to ST's VIPower™ family of intelligent power ICs, designed specifically for robust, high-current automotive actuation - combining power switching, protection, and diagnostics in a single rugged package.

FAQ

What is the function of the DIAG pin on VB027(6)-E?

The DIAG pin is an open-collector diagnostic output that transitions high when collector current exceeds 4.5 A (first threshold) and low when it exceeds 5.8 A (second threshold). It provides real-time feedback to the microcontroller for staged fault response - warning then forced shutdown - without requiring external comparators or sense resistors.

Can VB027(6)-E drive ignition coils with primary inductance outside the 7 mH specification?

Yes - the VB027(6)-E's quasi-proportional base drive and internal current limiting adapt to coil inductances from 4 mH to 10 mH. However, dwell time must be recalculated per coil L/R time constant to avoid exceeding Icl (9 A max) or thermal limits; ST application note AN2012 provides design guidelines for non-standard coils.

How does the overtemperature detection affect diagnostic flag behavior?

Above 125 °C, the overtemperature circuit reduces the first diagnostic threshold (IC(diag1)) by approximately 1 A - e.g., from 4.5 A to ~3.5 A - to alert the MCU earlier about thermal stress. This shift is not a hard shutdown but enables proactive dwell reduction before junction temperature reaches 150 °C absolute maximum.

Is external heatsinking required for continuous 9 A operation?

Yes - with Rthj-case = 1.12 °C/W, dissipating ~13.5 W at 9 A and Vcg(sat) = 1.5 V requires a heatsink maintaining case temperature ≤100 °C to stay within Tj(max) = 150 °C. ST recommends mounting the insulated metal tab directly to a ≥15 cm² aluminum heatsink with thermal interface material.