STMicroelectronics STTH4R02B

Overview

STTH4R02B from STMicroelectronics is an ultrafast recovery silicon rectifier diode in DPAK (TO-252) package, rated for 200 V repetitive peak reverse voltage, 4 A average forward current at Tc = 160 °C, and 16 ns typical reverse recovery time (trr) at dIF/dt = −100 A/µs. It delivers low conduction losses (VF typ. 0.76 V at 150 °C, 4 A) and operates up to 175 °C junction temperature, making it suitable for high-frequency freewheeling in DC-DC converters and base-drive circuits for power transistors.

For engineers reviewing the STTH4R02B datasheet, STTH4R02B pinout, STTH4R02B application, or STTH4R02B equivalent, key selection criteria include verified trr ≤ 20 ns under high dIF/dt, thermal resistance Rth(j–c) = 3.5 °C/W, cathode-band polarity marking, and ECOPACK®2 compliance for lead-free assembly in industrial power supplies and motor control inverters.

Technical Context

This device employs ST's planar platinum-doped silicon technology to achieve ultrafast soft recovery with negligible switching losses and minimal reverse recovery charge (Qrr). Its low VF and fast trr are optimized for hard-switched topologies operating above 50 kHz.

The DPAK package provides direct thermal path from junction to case via the exposed cathode tab, enabling efficient conduction cooling in surface-mount power stages. Device behavior is characterized across −65 °C to +175 °C, with IR leakage < 20 µA at 125 °C and VR = VRRM.

Key Specifications

Pinout & Package

STTH4R02B is housed in a DPAK (TO-252) thermally enhanced surface-mount package with three terminals: anode (lead 2), cathode (exposed tab/lead 3), and auxiliary cathode connection (lead 1). The cathode band marks the cathode side of the device.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH4L02B and VS-4EY20-M3, STTH4R02B uniquely balances sub-20 ns trr and sub-0.8 V VF at 150 °C-enabling higher-frequency operation without sacrificing thermal headroom in compact DPAK layouts.

Availability

STTH4R02B is available at Aetrix Electronics and suitable for DC-DC converters, motor driver gate clamps, low-voltage inverters, and polarity protection circuits requiring stable component supply and long-term industrial lifecycle support.

Supply support for STTH4R02B 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 automotive, industrial, and consumer markets.

The STTH series targets high-efficiency power conversion systems, with STTH4R02B specifically engineered for ultrafast switching in compact SMT power stages where thermal density and EMI control are critical.

FAQ

What is the maximum allowable PCB copper area for optimal thermal performance of STTH4R02B?

The DPAK thermal pad requires ≥2 cm² of 2-oz copper connected directly to the cathode tab. Per Figure 12, Rth(j–a) drops from 60 °C/W (no copper) to 35 °C/W with 2 cm², and further to 28 °C/W with 4 cm². For 4 A continuous operation, ≥3 cm² is recommended to maintain Tj < 135 °C at 70 °C ambient.

Does STTH4R02B support reflow soldering per JEDEC J-STD-020?

Yes. STTH4R02B is qualified for standard Pb-free reflow profiles (peak 260 °C, 20–40 s above 217 °C) per JEDEC J-STD-020D. The epoxy meets UL94 V0, and the DPAK body withstands thermal cycling without delamination or solder joint cracking when mounted on 1.6 mm FR-4 with ≥2 cm² thermal pad.

Can STTH4R02B replace a Schottky diode in a 12 V output converter?

Only if VRRM margin is sufficient. STTH4R02B's 200 V rating exceeds typical 12 V output needs, but its 0.76 V VF at 4 A is higher than most 20–40 V Schottkys (0.4–0.55 V). Use it where Schottky leakage (>100 µA at 125 °C) causes instability or where 175 °C operation is mandatory-otherwise, Schottky remains more efficient.

Is the cathode band on STTH4R02B aligned with lead 1 or lead 3?

The cathode band aligns with lead 1 (auxiliary cathode) and extends across the top edge toward lead 3 (main cathode tab). Per Figure 15, the band is positioned adjacent to the shorter lead (lead 1); lead 2 (anode) is the center lead, and lead 3 is the large exposed tab. Correct orientation places the band toward the PCB edge nearest the anode trace.