STMicroelectronics STTH4R02B-TR

Overview

STTH4R02B-TR from STMicroelectronics is an ultrafast recovery silicon diode optimized for high-frequency switching applications, featuring 200 V repetitive peak reverse voltage (VRRM), 4 A average forward current (IF(AV)), 16 ns typical reverse recovery time (trr), and 0.76 V typical forward voltage at 150 °C junction temperature. It is used in low-voltage inverters, freewheeling paths, and polarity protection circuits with DPAK surface-mount packaging.

For engineers reviewing the STTH4R02B-TR datasheet, STTH4R02B-TR pinout, STTH4R02B-TR application, or STTH4R02B-TR equivalent, key selection criteria include trr ≤ 20 ns at dIF/dt = −100 A/µs, VF ≤ 0.83 V at 150 °C and 4 A, Rth(j-c) = 3.5 °C/W, and ECOPACK®2 compliance for industrial-grade thermal and environmental reliability.

Technical Context

The STTH4R02B-TR employs platinum-doped planar junction technology to achieve ultrafast soft recovery with negligible tail current, enabling efficient operation in SMPS base-drive and transistor snubber circuits. Its low conduction losses stem from a VF of 0.76 V (typ) at 150 °C and 4 A, while its 175 °C maximum junction temperature supports high-power-density designs.

Dynamic performance is characterized by trr = 16 ns (typ) at IF = 1 A, dIF/dt = −100 A/µs, VR = 30 V, and IRM = 4.4–5.5 A (typ–max) under high dIF/dt conditions. Thermal design relies on junction-to-case resistance of 3.5 °C/W (DPAK), requiring direct thermal coupling to PCB copper for sustained 4 A operation at Tc = 160 °C.

Key Specifications

Pinout & Package

STTH4R02B-TR is housed in a DPAK (TO-252) surface-mount package with three terminals: anode, cathode, and thermal tab (electrically connected to cathode). The cathode is marked by a band on the package body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH4R02B-TR, STTH4L02B-TR trades 6 ns of recovery speed for 0.04 V lower VF, while MBR420FCT-TP eliminates trr entirely but sacrifices 25 °C of junction temperature headroom and exhibits higher IR at 125 °C.

Availability

STTH4R02B-TR is available at Aetrix Electronics and suitable for DC-DC converters, motor drive protection circuits, inverter snubbers, and SMPS base-drive clamps requiring stable component supply and long-term industrial availability.

Supply support for STTH4R02B-TR 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.

The STTH ultrafast diode product line targets high-efficiency power conversion systems requiring low-loss, high-temperature, and high-frequency switching performance in compact surface-mount packages.

FAQ

Is STTH4R02B-TR pin-compatible with other DPAK diodes like STTH8R06D?

No. STTH4R02B-TR has anode-cathode-tab pinout (1-2-3), while STTH8R06D uses cathode-anode-tab (2-1-3). Physical DPAK footprint matches, but electrical connection order differs - incorrect placement causes circuit failure. Always verify pin 1 marking and schematic symbol orientation before layout.

What is the maximum recommended PCB copper area for thermal performance?

For continuous 4 A operation at Tc = 160 °C, ST recommends ≥ 250 mm² of 2-ounce copper connected directly to the cathode/tab. This achieves the specified Rth(j-c) = 3.5 °C/W. Smaller pads increase thermal resistance linearly - e.g., 100 mm² raises Rth(j-c) to ~6.2 °C/W, limiting safe current to ~2.5 A.

Does STTH4R02B-TR require a heatsink in standard FR-4 PCB mounting?

No external heatsink is required. The DPAK thermal tab is designed for direct conduction cooling via PCB copper. With ≥ 250 mm² of 2-oz copper per lead and adequate airflow, it sustains 4 A at 160 °C case temperature. Forced air or metal-core PCBs further improve margin but are not mandatory for nominal operation.

Can STTH4R02B-TR replace a 1N5822 in a 24 V DC-DC converter?

Only if VRRM and trr requirements align. 1N5822 is a 40 V Schottky (VF ≈ 0.5 V) - unsuitable for 200 V systems. STTH4R02B-TR offers higher VRRM and faster recovery than general-purpose rectifiers like 1N5408, but its 0.76 V VF is higher than Schottkys. Use only where 200 V rating and ultrafast recovery are essential, not as a generic Schottky substitute.