STMicroelectronics STTH1R02U

Overview

STTH1R02U from STMicroelectronics is a 200 V, 1.5 A ultrafast recovery diode in SMB package, featuring 15 ns typical reverse recovery time, 0.70–0.85 V forward voltage at 100–150 °C, and 175 °C maximum junction temperature - optimized for high-frequency flyback and base-drive circuits in LED lighting and auxiliary power supplies.

For engineers reviewing the STTH1R02U datasheet, STTH1R02U pinout, STTH1R02U application, or STTH1R02U equivalent, key selection criteria include ultrafast trr (15–30 ns), low VF at elevated Tj, thermal resistance (Rth(j-l) = 30 °C/W), ECOPACK®2 compliance, and SMB footprint compatibility with space-constrained PCB layouts.

Technical Context

This diode employs ST's planar platinum-doped silicon technology to achieve precise carrier lifetime control, enabling stable ultrafast switching with minimal reverse recovery charge (QRR) and negligible tail current. Its dynamic behavior is characterized under defined dIF/dt conditions (up to –200 A/µs) and VR up to 160 V.

The device operates across –65 °C to +175 °C junction range, with thermal performance validated for SMB package via Rth(j-l) = 30 °C/W and Rth(j-a) curves dependent on copper area and lead length - critical for thermal design in compact SMPS and LED drivers.

Key Specifications

Pinout & Package

SMB (Surface Mount Diode) package: 3.3–3.95 mm wide × 5.1–5.6 mm long × 1.9–2.45 mm height, UL94 V0 epoxy, lead-free, with gull-wing leads for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR120E and VS-1N5819HM3/85A, STTH1R02U uniquely balances 200 V rating, 1.5 A current capability, 15 ns trr, and 175 °C operation - making it optimal for thermally demanding, medium-voltage switching applications where both speed and ruggedness are required.

Availability

STTH1R02U is available at Aetrix Electronics and suitable for LED lighting drivers, auxiliary power supplies, and industrial polarity protection circuits requiring stable component supply and consistent SMB footprint compatibility.

Supply support for STTH1R02U 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 devices for automotive, industrial, and power applications.

The STTH ultrafast diode product line targets high-frequency switching power conversion, emphasizing low-loss recovery, thermal robustness, and package flexibility - directly addressing design needs in compact, efficient SMPS and LED driver architectures.

FAQ

What is the maximum allowable surge current for STTH1R02U?

The STTH1R02U supports a non-repetitive surge forward current (IFSM) of 60 A for 10 ms sinusoidal pulses. This rating applies to transient overload conditions such as inrush or fault events, and must be verified against actual circuit energy using I²t calculations to ensure junction temperature remains within 175 °C limits.

Does STTH1R02U require a heatsink in typical SMB applications?

No external heatsink is required for STTH1R02U in standard SMB mounting: its Rth(j-l) = 30 °C/W allows adequate thermal dissipation into PCB copper. For sustained 1.5 A operation at >70 °C ambient, ≥2 cm² of 35 µm copper per lead is recommended - verified in ST's AN5088 thermal management guidelines.

How does trr vary with temperature and dIF/dt?

trr decreases with rising junction temperature and increasing dIF/dt: at Tj = 125 °C and dIF/dt = –200 A/µs, trr drops to ~15 ns (vs. 23 ns at 25 °C). This inverse relationship is documented in Figure 10 of DS4743 and improves switching consistency in high-temperature, high-dI/dt environments like motor drive snubbers.

Is STTH1R02U compatible with lead-free reflow profiles?

Yes - STTH1R02U is qualified for lead-free reflow per JEDEC J-STD-020, with peak temperature tolerance up to 260 °C. Its SMB package uses UL94 V0 epoxy and complies with ECOPACK®2, ensuring reliable solder joint formation and long-term interconnect integrity under standard Pb-free thermal cycling profiles.