STMicroelectronics VB325SP13TR

Overview

VB325SP13TR from STMicroelectronics is a high-voltage ignition coil driver power IC built on VIPower™ M1-3 technology, featuring vertical current flow Darlington output, internally set 380 V collector voltage clamp, 10 A coil current limit, and logic-level compatible input. It serves as a smart high-current interface in electronic ignition systems, directly driving automotive primary ignition coils with thermal shutdown and low-voltage clamp protection.

For engineers reviewing the VB325SP13TR datasheet, VB325SP13TR pinout, VB325SP13TR application, or VB325SP13TR equivalent, key selection criteria include its 380 V high-voltage clamp, 10 A current limit, PowerSO-10™ package thermal resistance (1 °C/W junction-to-case), diagnostic flag output threshold at 4.5 A, and enable-controlled blocking functionality.

Technical Context

The VB325SP13TR integrates a vertically structured Darlington power stage with quasi-proportional base drive, enabling precise coil current control without external sensing. Its internal current limiting activates at 9–11 A across –40 °C to 125 °C, and thermal shutdown triggers at 150 °C with automatic current ramp-down to prevent misfire.

It features dual clamping: high-voltage clamp (320–420 V) during coil turn-off and low-voltage clamp (30–50 V) during thermal overload. The open-emitter FLAG pin asserts high when coil current exceeds 4.25–4.75 A, providing real-time current monitoring synchronized to dwell timing.

Key Specifications

Pinout & Package

The VB325SP13TR is housed in a PowerSO-10™ package with exposed thermal tab (HVC pin), optimized for high-power dissipation in automotive under-hood environments. Pin 1 and Pin 5 are internally connected to LGND and must be externally shorted to Pins 2–4 (GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STGD3HF60L and BD9882FV, the VB325SP13TR delivers fully integrated protection, diagnostics, and current regulation in a single PowerSO-10™ package-reducing PCB area by 35%, eliminating 7 external components, and enabling ASIL-B–compatible functional safety architecture without additional hardware.

Availability

VB325SP13TR is available at Aetrix Electronics and suitable for automotive engine control units, two-wheel vehicle ignition modules, and industrial gas engine ignition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for VB325SP13TR 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The VB325SP13TR belongs to ST's VIPower™ family of intelligent power ICs, engineered specifically for high-energy automotive actuators-including ignition, fuel injection, and valve control-where integration of power switching, protection, and diagnostics is essential.

FAQ

What is the function of the ENABLE pin (Pin 6) on the VB325SP13TR?

The ENABLE pin is an active-high hardware control that forces the output OFF regardless of the INPUT signal state when held below 0.4 V. When pulled to ≥2 V, it permits normal INPUT-driven operation. This enables fail-safe shutdown via external sensors (e.g., oil pressure switch) without MCU intervention, meeting functional safety requirements for ignition systems.

Can the VB325SP13TR drive ignition coils with inductance values outside the specified 3.75 mH?

Yes-the device supports coil inductances from 1.5 mH to 6 mH, as validated by avalanche energy testing up to 6 mH (Figure 2). However, switching times scale linearly with L/R; for coils >4.5 mH, t_OFF may exceed 25 µs, requiring dwell extension in ECU firmware to maintain target current.

How does the low-voltage clamp feature operate during thermal overload?

When junction temperature reaches 150 °C, the thermal shutdown circuit activates and reduces base drive to smoothly decrease collector current to ~30% of nominal within 100 µs. Simultaneously, the output clamps at 30–50 V instead of 380 V, preventing spark generation while preserving coil integrity-critical for avoiding misfire-induced catalytic converter damage.

Is external current sensing required when using the FLAG output for diagnostics?

No-FLAG is a direct, factory-trimmed current-threshold indicator (4.25–4.75 A) referenced to internal sense elements. It eliminates need for shunt resistors or op-amp circuits. For quantitative current measurement, external sensing remains necessary-but for dwell confirmation, open-circuit detection, and overcurrent alarm, FLAG alone suffices.