STMicroelectronics VN03(012Y)

Overview

VN03(012Y) from STMicroelectronics is a high-side smart power solid-state relay IC designed for automotive ISO-compliant load switching, featuring 4A continuous output current at Tc=85°C, 60V V_DSS, 0.5Ω R_DS(on), and integrated open-drain diagnostic output. It drives grounded resistive or inductive loads in body control modules, lighting, and HVAC actuators with thermal shutdown, under-voltage protection, and -18V fast demagnetization.

For engineers reviewing the VN03(012Y) datasheet, VN03(012Y) pinout, VN03(012Y) application, or VN03(012Y) equivalent, key selection criteria include ISO 16750-2 pulse 5 compliance (level II), 5V logic compatibility, diagnostic filtering timing (t_povl/t_pol), and PENTAWATT thermal resistance (R_thj-case = 4.5°C/W).

Technical Context

The VN03 integrates a vertical power MOSFET with embedded protection logic and diagnostics. Its internal architecture includes a temperature-sensing element located near the die's heat-generating region, enabling sub-millisecond thermal shutdown activation at 140°C and automatic recovery at 125°C. The diagnostic output implements dual-mode filtering: 5 ms delay for open-load detection in both ON/OFF states, and immediate low assertion for overtemperature faults.

Inductive load handling uses active clamp circuitry to generate a controlled -18V demagnetization voltage during turn-off, reducing dissipation via energy recycling. Input logic thresholds are internally clamped (VIH ≈ 6V), supporting direct connection to 5V microcontrollers while tolerating transient overvoltage up to 26V supply rail.

Key Specifications

Pinout & Package

The VN03(012Y) is housed in a PENTAWATT (5-pin, single-in-line) package with exposed metal tab for thermal conduction and mechanical mounting. Pin 1 is GND, Pin 2 is INPUT, Pin 3 is V_CC, Pin 4 is STATUS (open-drain), and Pin 5 is OUTPUT (drain). The tab is electrically connected to Pin 5 (OUTPUT) and must be isolated from chassis ground unless referenced to load return.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side automotive switch applications.

Compared with VN03(012Y), STVN03BTR offers identical functionality with improved manufacturability and ESD resilience, while BTS4140N trades integrated diagnostics and demag for higher current capacity and lower conduction loss-requiring external circuitry to match VN03's autonomous protection set.

Availability

VN03(012Y) is available at Aetrix Electronics and suitable for automotive lighting control, engine cooling fan drivers, and body control module outputs requiring stable component supply and long-term lifecycle support.

Supply support for VN03(012Y) 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 over 40 years of automotive qualification experience.

The VN03 belongs to ST's ISO high-side intelligent power switch product line, engineered specifically for AEC-Q100-compliant automotive body electronics demanding integrated protection, diagnostics, and load-dump immunity.

FAQ

What is the maximum safe operating voltage for VN03(012Y) during load dump events?

VN03(012Y) withstands ISO 7637-2 Test Pulse 5 Level II (46.5 V peak) without external components, and Level III (60 V peak) with a 150 Ω series resistor and 1000 µF capacitor on V_CC. Its 60 V V_DSS rating provides margin above these transients, ensuring reliable operation in 12 V automotive systems.

How does the STATUS pin behave during an open-load fault in the ON state?

When an open load occurs while the device is ON, the STATUS pin goes low after a 5–10 ms filtering delay (t_pol). This delay prevents false triggering from brief contact bounce or noise. The pin remains low until the load is reconnected for ≥5 ms, at which point it returns high, confirming restoration of continuity.

Can VN03(012Y) drive inductive loads without an external freewheeling diode?

No-while VN03(012Y) provides -18 V active demagnetization, an external Schottky diode (e.g., STPS20L45C) is still required across the load to handle residual energy and prevent voltage overshoot beyond the clamp limit. The internal clamp reduces diode stress but does not eliminate its need.

Is VN03(012Y) qualified to AEC-Q100 standards?

VN03(012Y) is designed and characterized for automotive applications per ISO 16750 and meets AEC-Q100 stress test requirements for high-side switches. Though the original datasheet predates formal AEC-Q100 Rev G documentation, ST confirms qualification for Grade 1 (-40°C to +125°C) operation and thermal cycling performance in production lots.