Taiwan Semiconductor Corporation SSL34

Overview

SSL34 from Taiwan Semiconductor is a 40 V, 3 A surface-mount Schottky barrier rectifier in DO-214AB (SMC) package, optimized for high-efficiency switching mode power supplies and lighting converters with low forward voltage (0.41 V max at 3 A) and high surge capability (100 A IFSM).

For engineers reviewing the SSL34 datasheet, SSL34 pinout, SSL34 application, or SSL34 equivalent, key selection factors include its 40 V repetitive peak reverse voltage, 500 µA reverse leakage at 25°C, junction-to-lead thermal resistance of 13 °C/W, and RoHS/halogen-free compliance for industrial and adapter designs.

Technical Context

The SSL34 operates as a single-die Schottky rectifier with cathode-band polarity indication and is rated for continuous forward current up to 3 A at 125°C junction temperature. Its thermal performance is characterized on a 16 mm × 16 mm copper pad PCB, delivering R_θJL = 13 °C/W and R_θJA = 53 °C/W.

Electrical behavior includes a typical forward voltage of ≤0.41 V at 3 A/25°C (pulse test), reverse leakage of 500 µA at 40 V/25°C and 100 mA at 40 V/100°C, and robust surge handling per 8.3 ms half-sine waveform per JESD201 Class 2 whisker-tested matte tin leads.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC) - Surface-mount plastic case with cathode band marking, 16 mm × 16 mm Cu pad thermal reference, UL 94V-0 molding compound, and matte tin-plated leads compliant with J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-3EYH04-M3/5BT and SB340-TB, the SSL34 delivers lower forward voltage and reverse leakage while maintaining identical 40 V/3 A ratings and DO-214AB packaging-enabling higher efficiency and cooler operation without layout changes.

Availability

SSL34 is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and LED lighting drivers requiring stable component supply, consistent parametric performance across production lots, and long-term industrial lifecycle support.

Supply support for SSL34 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global power electronics and industrial markets since 1979.

The SSL3x series targets high-efficiency, surface-mount Schottky rectification in cost-sensitive yet thermally demanding applications-including consumer adapters, LED drivers, and industrial DC-DC stages-emphasizing low VF, robust surge immunity, and JEDEC-compliant packaging.

FAQ

What is the maximum junction temperature rating for the SSL34?

The SSL34 has a maximum junction temperature (T_J) rating of +125°C, validated under continuous 3 A forward current operation with thermal management per the specified 16 mm × 16 mm copper pad PCB layout. This rating ensures reliable operation in enclosed adapter and lighting driver enclosures without forced airflow. The SSL34 must not exceed this limit during steady-state or transient conditions to maintain parametric stability and long-term reliability.

Does the SSL34 have a cathode band marking, and how is polarity identified?

Yes, the SSL34 uses a visible cathode band on the molded plastic body to indicate polarity, consistent with DO-214AB (SMC) industry convention. The banded end corresponds to the cathode terminal, which must be connected toward the positive output rail in rectifier applications. This marking is laser-etched and remains legible after reflow soldering, supporting automated optical inspection (AOI) and manual verification during board assembly.

What is the reverse leakage current specification for the SSL34 at elevated temperature?

The SSL34 specifies a maximum reverse leakage current (I_R) of 100 mA at 40 V and 100°C junction temperature, measured using a 30 ms pulse test. This value reflects real-world thermal stress in high-ambient environments such as enclosed LED drivers or industrial converters. At 25°C, I_R is limited to 500 µA, confirming tight process control and low defect density in the Schottky junction.

Is the SSL34 compatible with lead-free reflow profiles?

Yes, the SSL34 is fully compatible with standard lead-free reflow profiles (JEDEC J-STD-020, Level 1), with a moisture sensitivity level (MSL) of 1-meaning it can be stored indefinitely at ambient conditions without baking. Its matte tin-plated leads meet J-STD-002 solderability requirements, ensuring robust wetting and intermetallic formation during peak temperatures up to 260°C.

How does the SSL34's thermal resistance compare to similar Schottky rectifiers in DO-214AB packages?

The SSL34 achieves a junction-to-lead thermal resistance (R_θJL) of 13 °C/W, measured on a 16 mm × 16 mm copper pad PCB-matching or exceeding industry benchmarks for DO-214AB Schottky devices. This value enables efficient heat transfer from die to PCB plane, reducing thermal derating needs and supporting higher sustained current in space-constrained layouts compared to alternatives with R_θJL >15 °C/W.