STMicroelectronics STTH1R02ZF

Overview

STTH1R02ZF from STMicroelectronics is an ultrafast recovery silicon rectifier diode in SOD123Flat package, rated for 200 V repetitive peak reverse voltage, 1 A average forward current, and 25 ns typical reverse recovery time (trr) at 25 °C. It serves as a freewheeling and polarity protection diode in low-voltage, high-frequency inverters and SMPS energy recovery circuits.

For engineers reviewing the STTH1R02ZF datasheet, STTH1R02ZF pinout, STTH1R02ZF application, or STTH1R02ZF equivalent, key selection criteria include its 0.75 V typical forward voltage at 125 °C, 175 °C maximum junction temperature, 23 °C/W junction-to-lead thermal resistance, and ECOPACK®2-compliant surface-mount packaging for thermally demanding power stages.

Technical Context

This device employs a planar epitaxial silicon structure optimized for ultrafast switching with soft recovery characteristics. Its trr of 25–32 ns (depending on dIF/dt and Tj) and low Qrr of 34 nC minimize switching losses in hard-switched topologies, while the 0.75–0.85 V VF range at 125 °C ensures stable conduction performance across industrial temperature ranges.

The SOD123Flat package provides low thermal resistance (Rth(j-l) = 23 °C/W) and supports high surge capability (25 A IFSM, 10 ms sine half-wave), enabling reliable operation in transient-heavy applications such as motor drive clamp circuits and DC-DC synchronous rectifier snubbers.

Key Specifications

Pinout & Package

SOD123Flat is a surface-mount, two-terminal plastic package with gull-wing leads. It features a compact footprint (3.5 mm × 1.6 mm × 0.98 mm max height), epoxy body compliant with UL94 V0, and thermal conduction cooling via the cathode and anode leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR120 and VS-1EWH02-M3/5AT, STTH1R02ZF delivers the lowest combined conduction + switching loss in SMT form factor, making it optimal for miniaturized, high-efficiency 100–500 kHz power stages where thermal headroom and EMI control are critical.

Availability

STTH1R02ZF is available at Aetrix Electronics and suitable for SMPS secondary rectification, motor drive freewheeling, polarity protection, and DC-DC snubber circuits requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.

Supply support for STTH1R02ZF 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, digital, and mixed-signal ICs and discrete power devices for industrial, automotive, and consumer markets.

The STTH ultrafast rectifier product line targets high-frequency power conversion with optimized trade-offs between forward voltage, recovery speed, and ruggedness-specifically engineered for efficiency-critical SMPS, motor drives, and protection circuits.

FAQ

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

The datasheet specifies Rth(j-a) vs. copper surface area under each lead (Figure 11). For 1 A continuous operation, ≥1.5 cm² total copper per lead (3 cm² total) reduces junction-to-ambient thermal resistance to ≤120 °C/W, keeping Tj < 125 °C at 25 °C ambient. Use thermal vias under pads for further improvement.

Can STTH1R02ZF replace a standard PN junction diode in a 24 V relay driver?

Yes-it is suitable for relay coil freewheeling due to its 200 V VRRM (4× 24 V), 25 A IFSM (exceeding typical relay kickback energy), and soft recovery that suppresses contact arcing. Its 0.75 V VF also reduces power dissipation versus 1N4007 (1.1 V), lowering thermal stress on adjacent components.

Is this diode suitable for use with SiC MOSFETs in a 300 kHz totem-pole PFC?

No-while STTH1R02ZF has ultrafast trr, its 25 ns recovery is insufficient for SiC-based totem-pole PFC where sub-10 ns recovery and near-zero Qrr are required to avoid shoot-through and excessive loss. Use dedicated SiC Schottky diodes (e.g., STPSC20065D) instead.

Does the SOD123Flat package support reflow soldering per J-STD-020?

Yes-the SOD123Flat package is qualified for standard Pb-free reflow profiles (peak 260 °C, 20–40 s above 217 °C). The epoxy body meets UL94 V0 and withstands multiple reflow cycles without delamination or parameter shift, as verified in ST's qualification report Q310-001.