STMicroelectronics STTH102

Overview

STTH102 from STMicroelectronics is a 200 V, 1 A ultrafast recovery rectifier diode using platinum-doped planar technology, optimized for high-efficiency switching applications including flyback and base-drive circuits in power supplies and LED lighting. It delivers low conduction losses (VF(typ.) = 0.68 V at 125 °C), ultrafast reverse recovery (trr(typ.) = 12 ns), and operates up to 175 °C junction temperature.

For engineers reviewing the STTH102 datasheet, STTH102 pinout, STTH102 application, or STTH102 equivalent, key selection criteria include its dual-package availability (SMA/DO-41), thermal resistance (Rth(j-l) = 30 °C/W for SMA), ECOPACK®2 compliance, and suitability for high-frequency auxiliary supply and freewheeling roles where low VF and minimal switching loss are critical.

Technical Context

The STTH102 employs platinum diffusion in a planar silicon structure to achieve precise carrier lifetime control, enabling ultrafast recovery with low QRR and negligible tail current. Its dynamic behavior is characterized by trr = 12 ns (typ.) at IF = 0.5 A and dIF/dt = 200 A/µs, with forward recovery voltage limited to 1.8 V under high di/dt conditions.

Thermally, it supports continuous operation at Tj(max.) = 175 °C, with package-specific thermal resistances: Rth(j-l) = 30 °C/W (SMA) and 50 °C/W (DO-41). The device exhibits stable VF across temperature - 0.68 V (typ.) at 125 °C and 0.97 V (typ.) at 25 °C - ensuring predictable conduction loss in wide-temperature designs.

Key Specifications

Pinout & Package

STTH102 is available in two industry-standard through-hole and surface-mount packages: DO-41 (axial leaded, 0.34 g) and SMA (surface-mount, 0.068 g). Both feature epoxy bodies compliant with UL 94 V0 and ECOPACK®2 environmental requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH102, STTH1L06 trades speed and VF for higher voltage robustness, while ES1D offers lower cost but sacrifices efficiency and frequency capability - making STTH102 optimal for thermally constrained, high-frequency 200 V rectification.

Availability

STTH102 is available at Aetrix Electronics and suitable for LED lighting drivers, auxiliary power supplies, switching-mode base drive circuits, and industrial flyback protection requiring stable component supply and dual-package flexibility.

Supply support for STTH102 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

The STTH series targets high-efficiency power conversion, specifically engineered for ultrafast, low-loss rectification in compact, thermally demanding switch-mode power supplies and lighting systems.

FAQ

What is the maximum junction temperature for STTH102, and how does it affect thermal design?

The STTH102 has a rated maximum junction temperature of 175 °C. This allows operation in high-ambient environments without aggressive derating - for example, in sealed LED drivers where ambient may reach 105 °C. Thermal design must respect package-specific Rth(j-l): 30 °C/W for SMA requires ≥1 cm² of 35 µm copper per lead, while DO-41's 50 °C/W demands longer leads or added copper area.

Can STTH102 be used as a replacement for standard fast recovery diodes in existing 100 kHz flyback designs?

Yes - STTH102's 12 ns trr and 0.68 V VF at 125 °C provide measurable improvement over typical fast diodes (e.g., trr >50 ns, VF >1.1 V). In a 100 kHz flyback, this reduces total diode loss by ~30%, lowering case temperature and improving efficiency by 0.4–0.7%. No circuit changes are needed beyond verifying layout clearance for SMA footprint or DO-41 lead spacing.

Does STTH102 support both SMA and DO-41 packages in tape-and-reel format?

Yes - STTH102A (SMA) ships in 5000-unit tape-and-reel, while STTH102RL (DO-41) is supplied in 5000-unit tape-and-reel. The base DO-41 variant (STTH102) uses 2000-unit ammopack. All versions share identical electrical specs; only mechanical form factor and packaging differ.

How does ECOPACK®2 compliance impact STTH102's material composition and reliability?

ECOPACK®2 certification confirms STTH102 uses halogen-free epoxy and RoHS-compliant plating - no brominated flame retardants or lead-based finishes. This does not compromise reliability: UL 94 V0 flammability rating is maintained, and high-temperature stability (175 °C Tj) and moisture sensitivity level (MSL 1) remain unchanged versus non-ECOPACK variants.