STMicroelectronics STTH2R02A

Overview

STTH2R02A from STMicroelectronics is a 200 V, 2 A ultrafast recovery silicon diode in SMA package, featuring 15 ns typical reverse recovery time (trr), 0.7 V typical forward voltage (VF) at 25 °C, and 175 °C maximum junction temperature - optimized for low-voltage, high-frequency flyback and freewheeling applications in LED drivers and auxiliary power supplies.

For engineers reviewing the STTH2R02A datasheet, STTH2R02A pinout, STTH2R02A application, or STTH2R02A equivalent, key selection criteria include ultrafast trr performance under high dIF/dt conditions, thermal robustness up to 175 °C, low conduction loss at 2 A average current, and ECOPACK®2-compliant lead-free SMA packaging for industrial-grade reliability.

Technical Context

This diode employs ST's patented planar platinum-doped technology to achieve ultrafast recovery with minimal tail current, enabling efficient operation in hard-switched SMPS topologies. Its 15 ns trr (at IF = 1 A, dIF/dt = −100 A/µs, VR = 30 V) and low IRM of 3–4 A (at Tj = 125 °C) reduce switching losses and EMI generation in high-frequency converters.

The device supports continuous operation at TJ(max) = 175 °C with Rth(j-l) = 30 °C/W (SMA), and exhibits VF as low as 0.70 V at 150 °C and 2 A - critical for minimizing conduction loss in compact, thermally constrained designs such as LED lighting ballasts and offline auxiliary supplies.

Key Specifications

Pinout & Package

Packaged in SMA (DO-214AC), this surface-mount diode has two terminals: anode and cathode, with cathode indicated by a band on the body. The SMA package provides UL94 V0 epoxy insulation and is optimized for conduction cooling via PCB copper pads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R02U and MUR220, the STTH2R02A delivers superior high-frequency efficiency due to its 15 ns trr and 0.7 V VF, while the SMA package offers optimal space-constrained thermal performance - making it preferred for compact LED drivers and auxiliary supplies operating above 65 kHz.

Availability

STTH2R02A is available at Aetrix Electronics and suitable for LED lighting drivers, auxiliary power supplies, flyback snubbers, and transistor base drive clamps requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for STTH2R02A 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, with STTH2R02A specifically engineered for ultrafast, low-loss rectification in compact, thermally demanding SMPS applications - emphasizing speed, thermal resilience, and eco-compliance.

FAQ

What is the maximum allowable surge current for STTH2R02A?

The STTH2R02A supports a non-repetitive surge forward current (IFSM) of 75 A for 10 ms sinusoidal pulses at 25 °C. This rating applies to short-duration overload events such as inrush or fault transients, and must be verified against thermal limits using Rth(j-l) = 30 °C/W and ambient conditions.

Can STTH2R02A replace a standard FR107 diode in a 65 kHz flyback converter?

Yes - STTH2R02A significantly outperforms FR107 (trr ≈ 500 ns, VF ≈ 1.3 V) with 15 ns trr and 0.7 V VF, reducing both switching and conduction losses. However, verify PCB layout compatibility (SMA vs. DO-41) and ensure adequate cathode-to-ground clearance for its 200 V VRRM rating.

Is STTH2R02A suitable for use at 150 °C ambient temperature?

No - while its Tj(max) is 175 °C, operation at 150 °C ambient requires zero power dissipation to avoid exceeding junction limit. At 2 A average current, typical power loss exceeds 1.4 W, necessitating heatsinking or derating. Realistic max ambient is ~85–90 °C with proper copper pour and airflow.

Does STTH2R02A require a snubber circuit in a 100 kHz flyback design?

Not inherently - its 15 ns trr and low IRM minimize voltage overshoot, but a small RC snubber may still be needed depending on transformer leakage inductance and layout parasitics. Empirical testing with oscilloscope probing at the drain-node is recommended to confirm absence of ringing or MOSFET overstress.