STMicroelectronics STTH2002DI

Overview

STTH2002DI from STMicroelectronics is an insulated ultrafast recovery rectifier diode in TO-220AC Ins package, rated for 200 V repetitive peak reverse voltage, 20 A average forward current at TC = 60 °C, and 16 ns typical reverse recovery time. It delivers low conduction loss (VF = 0.86 V typ. at 20 A, 150 °C) and high thermal robustness (Tj max = 175 °C), enabling use in high-frequency DC–DC converters and freewheeling paths in industrial SMPS.

For engineers reviewing the STTH2002DI datasheet, STTH2002DI pinout, STTH2002DI application, or STTH2002DI equivalent, key selection criteria include its 2500 VRMS insulation rating, 5 °C/W junction-to-case thermal resistance, and validated performance under high dIF/dt (up to −100 A/µs) in polarity protection and inverter freewheeling circuits.

Technical Context

This device is a single silicon planar epitaxial ultrafast rectifier optimized for low stored charge (Qrr) and minimal tail current, enabling efficient switching at frequencies up to several hundred kHz. Its low trr (16 ns typ.) and controlled IRM (8–10 A at 125 °C) reduce switching losses in hard-switched topologies.

The insulated TO-220AC package integrates a reinforced dielectric barrier between the metal tab and internal die, supporting safe mounting on live heatsinks without additional isolation hardware. Thermal design relies on conduction cooling with 0.55 N·m recommended mounting torque.

Key Specifications

Pinout & Package

STTH2002DI uses the insulated TO-220AC package (TO-220AC Ins), featuring a metal tab electrically isolated from the cathode terminal by molded epoxy. The device has two terminals: Anode (A) and Cathode (K); the insulated tab serves only as a thermal path and is not connected to either semiconductor terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2002D and STTH1202S, STTH2002DI uniquely balances 20 A current capability, 2500 VRMS insulation, and 16 ns recovery-making it optimal for high-reliability, isolated-mounting industrial SMPS where both thermal and safety margins are critical.

Availability

STTH2002DI is available at Aetrix Electronics and suitable for server power supplies, industrial DC–DC converters, polarity protection circuits, and inverter freewheeling paths requiring stable component supply and long-term lifecycle support.

Supply support for STTH2002DI 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, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

STTH2002DI belongs to ST's ultrafast rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in industrial and computing power supplies where low Qrr, fast trr, and reinforced isolation are mandatory.

FAQ

What is the maximum allowable case temperature for continuous 20 A operation?

The datasheet specifies IF(AV) = 20 A at TC = 60 °C for the STTH2002DI. Exceeding this case temperature requires derating per Figure 1 (Peak current vs. duty cycle). At TC = 75 °C, the average current must be reduced to approximately 16 A to maintain reliability and avoid exceeding Tj = 175 °C.

Can STTH2002DI replace STTH2002D in an existing design?

Yes, but only if the mechanical mounting accommodates insulation requirements. STTH2002DI's insulated tab eliminates need for shoulder washers, but its Rth(j-c) is 5 °C/W versus 2.4 °C/W for STTH2002D-requiring larger heatsinking for equivalent thermal performance. Electrical characteristics are otherwise identical.

Is the 2500 VRMS insulation rating certified to any safety standard?

The 2500 VRMS insulation is tested per IEC 60747-5-1 and qualifies the device for basic insulation in functional earth-referenced systems. It meets UL recognition requirements for reinforced insulation in end-equipment standards such as UL 62368-1 when used within specified creepage/clearance layouts and mounting torque (0.55 N·m).

How does trr vary with temperature and dIF/dt?

trr increases with junction temperature and decreases with higher dIF/dt. At Tj = 125 °C and dIF/dt = −100 A/µs, trr is ~30 ns (vs. 16 ns at 25 °C). This variation is documented in Figure 7 and must be accounted for in EMI filter design and snubber sizing for high-temperature operation.