STMicroelectronics STTH1502DI

Overview

STTH1502DI from STMicroelectronics is an ultrafast recovery silicon diode in insulated TO-220AC package, rated for 15 A average forward current, 200 V repetitive peak reverse voltage, and 175 °C maximum junction temperature. It delivers low conduction losses (VF typ. 0.85 V at 15 A, 150 °C), negligible switching losses, and fast reverse recovery time (trr typ. 20 ns at IF = 1 A, dIF/dt = −100 A/µs), making it suitable for high-frequency inverters and free-wheeling circuits in industrial power supplies.

For engineers reviewing the STTH1502DI datasheet, STTH1502DI pinout, STTH1502DI application, or STTH1502DI equivalent, key selection criteria include its 2500 VRMS electrical insulation rating, thermal resistance of 3.8 °C/W (junction-to-case), and validated performance under high dIF/dt conditions up to 500 A/µs at 125 °C junction temperature.

Technical Context

This diode employs ST's planar platinum-doped technology to achieve stable ultrafast recovery with minimal tail current, enabling efficient operation in hard-switched SMPS and motor drive freewheeling paths. Its low VF and trr reduce both conduction and switching losses simultaneously across wide load and temperature ranges.

The TO-220AC Ins package provides reinforced electrical isolation (2500 VRMS) while maintaining mechanical compatibility with standard TO-220 heatsink mounts. Thermal performance is characterized by Rth(j-c) = 3.8 °C/W, supporting reliable 15 A continuous operation at Tc = 105 °C without derating beyond datasheet limits.

Key Specifications

Pinout & Package

STTH1502DI uses a 3-terminal insulated TO-220AC package (TO-220AC Ins) with electrically isolated tab rated for 2500 VRMS. The metal tab serves as the cathode terminal and must be mounted to a heatsink using insulating hardware (e.g., mica washer + shoulder washer). Recommended torque: 0.8 Nm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast diode applications.

Compared with STTH1502D and STTH1602CW, STTH1502DI uniquely balances 2500 VRMS isolation, 15 A rating, and TO-220 footprint-making it optimal for space-constrained, isolated-output industrial converters where thermal margin exceeds 3.8 °C/W.

Availability

STTH1502DI is available at Aetrix Electronics and suitable for industrial SMPS output rectification, motor drive freewheeling, and DC bus polarity protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STTH1502DI 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 analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

STTH1502DI belongs to ST's ultrafast recovery diode product line, engineered specifically for high-efficiency, high-frequency power conversion in industrial and computing power supplies where low loss and robust thermal behavior are critical.

FAQ

Is STTH1502DI pin-compatible with STTH1502D?

No. While both share identical die and electrical characteristics, STTH1502DI uses the TO-220AC Ins package with electrically isolated tab, whereas STTH1502D uses standard TO-220AC. Mounting hardware, heatsink interface, and PCB layout differ due to insulation requirements and terminal configuration.

What is the maximum recommended case temperature for continuous 15 A operation?

The datasheet specifies IF(AV) = 15 A at Tc = 105 °C for the TO-220AC Ins package. Exceeding this case temperature requires linear derating per Figure 1; at Tc = 125 °C, maximum sustainable IF(AV) drops to approximately 11.5 A.

Can STTH1502DI be used in synchronous rectification topologies?

No. STTH1502DI is a unidirectional, passive ultrafast diode-not a MOSFET-based synchronous rectifier. It lacks gate control and cannot be actively turned off; it is intended for freewheeling, clamping, and polarity protection-not controlled rectification.

Does STTH1502DI require a snubber circuit in 200 kHz hard-switched applications?

Typically no. With trr ≤ 36 ns and QRR ≤ 35 nC, STTH1502DI exhibits minimal reverse recovery overshoot in well-layout 200 kHz flyback or forward converters. Snubbers may still be needed only if parasitic inductance exceeds 20 nH or layout introduces ringing above 30 MHz.