STMicroelectronics STTH102A

Overview

STTH102A from STMicroelectronics is an ultrafast recovery silicon rectifier diode in SMA package, rated for 200 V repetitive peak reverse voltage and 1 A average forward current, with typical reverse recovery time of 12 ns and forward voltage drop of 0.68 V at 125 °C - optimized for flyback and free-wheeling roles in auxiliary power supplies and LED lighting drivers.

For engineers reviewing the STTH102A datasheet, STTH102A pinout, STTH102A application, or STTH102A equivalent, key selection criteria include ultrafast trr (12 ns typ.), low VF (0.68 V @ 125 °C), high Tj(max) of 175 °C, ECOPACK®2 compliance, and thermal resistance Rth(j-l) = 30 °C/W in SMA package.

Technical Context

The STTH102A employs platinum-doped planar junction technology to achieve ultrafast switching with negligible stored charge and minimal reverse recovery tail. Its 12 ns typical trr and 50 ns tfr enable high-frequency operation in SMPS topologies without significant switching loss penalties.

Designed for unidirectional conduction in hard-switched circuits, it delivers stable performance across -65 °C to +175 °C ambient, supported by low thermal resistance (30 °C/W junction-to-lead) and robust surge capability (40 A IFSM, 10 ms sine wave).

Key Specifications

Pinout & Package

SMA package: surface-mount, single-diode configuration with cathode band marking; lead-free, RoHS-compliant, ECOPACK®2 certified epoxy body (UL94 V0). Dimensions: 4.80–5.35 mm × 3.95–4.60 mm × 0.75–1.50 mm (L×W×H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R02 and ES1D, the STTH102A uniquely balances 200 V blocking, 12 ns trr, and SMA surface-mount compatibility - making it optimal for space-constrained, high-frequency auxiliary supplies and LED drivers requiring both voltage margin and thermal efficiency.

Availability

STTH102A is available at Aetrix Electronics and suitable for LED lighting drivers, auxiliary power supplies, flyback snubbers, and transistor base-clamp circuits requiring stable component supply across production lifecycles.

Supply support for STTH102A 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, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The STTH series targets high-efficiency power conversion, with STTH102A specifically engineered for ultrafast switching in compact, thermally demanding auxiliary and lighting power stages.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The STTH102A has a maximum junction temperature rating of +175 °C, verified per absolute ratings table in DS2448 Rev 6. This allows uninterrupted operation at full 1 A average current in ambient temperatures up to 125 °C when mounted on recommended SMA footprint with adequate copper area, assuming Rth(j-a) ≈ 120 °C/W.

Is STTH102A pin-compatible with other SMA-packaged ultrafast diodes?

Yes - STTH102A uses standard SMA (DO-214AC) mechanical outline with anode/cathode polarity matching industry convention (cathode band on right side when viewed with marking up). It shares identical pad layout and solder profile requirements with SMA diodes like MUR120 or ES1D, enabling direct PCB footprint reuse.

Does STTH102A require a heatsink in typical 1 A applications?

No heatsink is required for 1 A continuous operation if mounted on ≥1 cm² of 35 µm copper per lead, per Figure 10 in DS2448. With Rth(j-l) = 30 °C/W and typical PCB conduction, junction-to-ambient rise remains below 50 °C at 1 A - well within the 175 °C limit even at 70 °C ambient.

How does STTH102A's trr compare to standard fast recovery diodes?

At 12 ns typical (vs. 50–100 ns for standard fast diodes like UF4007), STTH102A's reverse recovery is over 4× faster. This directly reduces switching loss in high-frequency converters and eliminates need for RC snubbers in most 200 kHz+ flyback designs, as confirmed by measured trr curves in Figure 9 of DS2448.