STMicroelectronics FERD30SM100ST

Overview

FERD30SM100ST from STMicroelectronics is a 100 V, 30 A average forward current field-effect rectifier in TO-220AB package, featuring 0.39 V typical forward voltage at 125 °C and 30 A, 150 µA max reverse leakage at 25 °C/100 V, and 1.6 °C/W junction-to-case thermal resistance - optimized for high-efficiency, thermally constrained AC/DC front-end and PFC stages.

For engineers reviewing the FERD30SM100ST datasheet, FERD30SM100ST pinout, FERD30SM100ST application, or FERD30SM100ST equivalent, key selection criteria include low VF/IR trade-off at elevated temperature, surge capability (250 A IFSM), thermal performance under conduction cooling, and ECOPACK®2 compliance for industrial power supplies.

Technical Context

This field-effect rectifier uses ST's proprietary silicon process to achieve superior conduction loss vs. leakage current balance - enabling stable operation up to 175 °C junction temperature while maintaining sub-0.43 V VF at 30 A and 125 °C. Its low Rth(j-c) of 1.6 °C/W supports direct heatsink mounting without forced airflow.

The device operates with no gate drive or control circuitry - functioning as a unidirectional, self-commutated power diode. Its 100 V VRRM rating targets universal-input offline SMPS, auxiliary rail rectification, and OR-ing applications where fast recovery and minimal reverse recovery charge are not required but low steady-state losses are critical.

Key Specifications

Pinout & Package

TO-220AB package with isolated tab (anode connected to case); mechanical mounting via M3 screw with recommended torque 0.55 N·m; epoxy meets UL94 V0; cooling by conduction only.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current, low-VF rectifier applications.

Compared with STTH30L06CW and VS-30CPH06-M3, FERD30SM100ST uniquely delivers 100 V rating with lowest VF in its class and certified eco-compliance - making it optimal for next-gen universal-input, thermally dense, and sustainability-driven power designs.

Availability

FERD30SM100ST is available at Aetrix Electronics and suitable for industrial AC/DC adapters, server auxiliary power supplies, and telecom PFC boost stages requiring stable component supply, long-term lifecycle assurance, and consistent thermal performance across production batches.

Supply support for FERD30SM100ST 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 power applications since 1987.

This device belongs to ST's Field-Effect Rectifier (FERD) product line - engineered specifically to replace conventional Schottky and fast-recovery diodes in high-efficiency, high-temperature power conversion systems where VF/IR optimization is critical.

FAQ

What is the maximum allowable heatsink temperature for continuous 30 A operation?

The datasheet specifies IF(AV) = 30 A at Tc = 130 °C - meaning the case (tab) temperature must not exceed 130 °C. With Rth(j-c) = 1.6 °C/W and 2.1 W conduction loss at 30 A/125 °C, the heatsink must maintain ≤127.9 °C to ensure 175 °C junction limit is not exceeded. Thermal interface resistance must be included in full system calculation.

Is FERD30SM100ST pin-compatible with standard TO-220AC rectifiers?

No - it uses TO-220AB package with isolated tab and NC lead (Lead 1), whereas TO-220AC has electrically connected tab and two functional leads. Mounting hole spacing and lead pitch match TO-220AB mechanical standard (15.5 mm D, 2.54 mm e), but electrical pinout differs: Anode = Tab, Cathode = Lead 2, Lead 1 = NC.

Does this device require gate drive or external control?

No - FERD30SM100ST is a passive, two-terminal rectifier with no gate terminal or control interface. It operates solely based on forward/reverse bias polarity, like a conventional diode. The "field-effect" designation refers to internal carrier modulation physics, not external controllability.

Can FERD30SM100ST replace a 100 V Schottky diode in an existing design?

Yes - with verification of thermal and surge margins. Its 0.39 V VF is lower than most 100 V Schottkys (typically 0.55–0.75 V), improving efficiency. However, reverse recovery behavior differs: it exhibits soft, low-Qrr recovery unlike abrupt Schottky turn-off, which may affect EMI in some layouts. Layout review is recommended.