STMicroelectronics STIL04-P5

Overview

STIL04-P5 from STMicroelectronics is an AC inrush current limiter IC designed to replace two bridge rectifier diodes in off-line PFC pre-regulators. It integrates dual unidirectional power switches and a pilot driver in a Pentawatt HV2 package, rated for 700 V repetitive off-state voltage, 4 A average output current, and 65 A non-repetitive surge current. It enables instantaneous recovery after AC line dropout in high-density server and telecom power supplies.

For engineers reviewing the STIL04-P5 datasheet, STIL04-P5 pinout, STIL04-P5 application, or STIL04-P5 equivalent, this device is selected for its dV/dt immunity (>1000 V/µs at 125°C), low trigger current (20 mA), integrated driver architecture, and IEC61000-4-5 lightning surge compliance (500 A peak) in space-constrained AC-DC front-end designs.

Technical Context

The STIL04-P5 operates as a controlled bidirectional AC switch replacement for half-wave paths in bridge rectifiers, activated only after PFC steady-state is reached via auxiliary supply coupling. Its dual-switch topology conducts during alternate half-cycles while blocking reverse current with <5 µA leakage at 25°C.

It features a self-contained pilot driver that triggers both internal power switches simultaneously using Pt1 and Pt2 terminals, enabling precise timing control during AC line brownout recovery and inrush limiting via external resistor Ri. The device sustains 700 V across L/N-to-OUT under transient overvoltage conditions per IEC61000-4-5.

Key Specifications

Pinout & Package

The STIL04-P5 is housed in a Pentawatt HV2 package with isolated tab for direct heatsink attachment and creepage/clearance optimized for 700 V operation. Package dimensions: 28.68 mm × 10.29 mm × 7.62 mm (L3 × H2 × G2), weight 1.9 g, UL94 V0 epoxy, lead-free ECOPACK® compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar inrush current limitation applications.

Compared with STIL04-T5 and PGB10SA, the STIL04-P5 delivers superior thermal management via its HV2 isolated-tab package, enables dynamic inrush control during AC interruptions, and provides verified 500 A surge immunity-making it the sole option for high-reliability, high-power PFC front-ends.

Availability

STIL04-P5 is available at Aetrix Electronics and suitable for server power supplies, telecom rectifiers, and high-end TV displays requiring stable component supply, long-term lifecycle support, and ECOPACK®-compliant manufacturing.

Supply support for STIL04-P5 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 power management, analog, microcontrollers, and automotive ICs with over 40 years of industrial power conversion expertise.

The STIL series was developed specifically for high-density off-line AC-DC converters needing integrated, intelligent inrush current control - targeting PFC-equipped power supplies where space, efficiency, and surge resilience are critical.

FAQ

What is the function of the Pt1 and Pt2 pins on the STIL04-P5?

Pt1 and Pt2 are low-current driver inputs that control the internal unidirectional power switches. Each requires 20 mA typical trigger current to activate its respective switch. They are electrically isolated from the main power path and accept logic-level signals from the auxiliary supply, enabling synchronous turn-on without external gate drivers or level shifters.

Can the STIL04-P5 be used without a PFC controller?

No - the STIL04-P5 relies on the auxiliary power supply derived from the PFC boost transformer to energize its internal driver circuit. Without PFC operation, there is no sustained voltage on Pt1/Pt2 to maintain switch conduction, causing the device to default to open-circuit mode and route all current through the external bridge diodes and inrush resistor.

How does the STIL04-P5 handle AC line dropout and recovery?

During AC dropout, the auxiliary supply deactivates, opening both internal switches. Upon line recovery, the bulk capacitor C_b recharges through the external inrush resistor R_i, limiting surge current. Only after C_b reaches sufficient voltage does the PFC controller re-enable the STIL, closing both switches to resume low-loss conduction.

Is heatsinking required for the STIL04-P5 in a 4 A continuous application?

Yes - the Pentawatt HV2 package requires direct mechanical attachment of the isolated tab to a heatsink. With R_th(j-c) = 2 °C/W and typical power dissipation of ~1.2 W at 4 A, junction temperature rise exceeds 100°C without heatsinking. A 10 °C/W heatsink maintains T_j < 125°C at full load and ambient 50°C.