Taiwan Semiconductor Corporation S3JAL

Overview

S3JAL from Taiwan Semiconductor is a 3A, 600V standard surface-mount rectifier diode in a Thin SMA package, featuring glass-passivated junction, 1.03V forward voltage at 3A/25°C, 50A surge rating, and 150°C max junction temperature - used in DC-DC converters and switching-mode inverters.

For engineers reviewing the S3JAL datasheet, S3JAL pinout, S3JAL application, or S3JAL equivalent, key selection criteria include repetitive peak reverse voltage (600V), forward current rating (3A), thermal resistance (R_θJL = 14°C/W), moisture sensitivity level (J-STD-020 Level 1), and RoHS/halogen-free compliance.

Technical Context

The S3JAL is a single-die, standard recovery rectifier optimized for high-efficiency switching power supplies. Its glass-passivated junction ensures stable reverse leakage (<1µA at 25°C) and robust surge capability (50A I_FSM, 8.3ms half-sine).

Thermal performance is characterized with R_θJA = 74°C/W on a 5mm × 5mm Cu pad PCB, and R_θJC = 20°C/W to case - enabling reliable operation up to 150°C junction temperature in compact layouts.

Key Specifications

Pinout & Package

Package: Thin SMA (JEDEC DO-221AC variation), low-profile surface-mount package with matte tin-plated leads, cathode indicated by band, MSL Level 1, UL 94V-0 molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3L06S and ES3J, the S3JAL delivers optimal balance of conduction efficiency (1.03V V_F), surge robustness (50A I_FSM), and manufacturability (MSL Level 1, thin profile), making it ideal for cost-driven, thermally sensitive, and mid-frequency switching applications.

Availability

S3JAL is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial AC-DC adapters requiring stable component supply, J-STD-020 Level 1 handling, and RoHS-compliant packaging.

Supply support for S3JAL 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, specializing in power rectifiers, TVS diodes, and MOSFETs since 1979.

The S3JAL belongs to TSC's Thin SMA standard rectifier family, engineered for high-reliability, cost-efficient power conversion in industrial and consumer power supplies where thermal performance and manufacturability are prioritized.

FAQ

What is the maximum junction temperature rating for the S3JAL?

The S3JAL has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table in the official datasheet. This allows the S3JAL to operate reliably in enclosed industrial environments or under sustained full-load conditions. Derating curves confirm usable average forward current down to ~1.8A at 125°C ambient on standard PCB layout. Thermal design must respect R_θJA = 74°C/W to avoid exceeding this limit.

Does the S3JAL have a specified reverse recovery time (t_rr)?

No, the S3JAL datasheet does not specify reverse recovery time (t_rr) because it is a standard (non-fast) recovery rectifier. Its behavior is characterized by reverse current (I_R) and junction capacitance (C_J = 14pF), not t_rr. For applications requiring fast recovery (e.g., >100kHz switching), alternatives like STTH3L06S should be evaluated. The S3JAL is intended for use in lower-frequency (<100kHz) rectification where conduction loss dominates over switching loss.

Is the S3JAL pin-compatible with other Thin SMA rectifiers such as ES3J or S3J?

Yes, the S3JAL shares identical Thin SMA package dimensions and pinout (anode/cathode) with ES3J and S3J, per JEDEC DO-221AC outline and TSC's mechanical drawings. All three use the same 4.4mm × 2.7mm body, 1.2mm height, and cathode-band polarity marking. However, electrical differences exist - notably V_F and I_FSM - so functional substitution requires verification of thermal and surge margins in the target circuit.

What is the moisture sensitivity level (MSL) of the S3JAL and what does it mean for assembly?

The S3JAL is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and requires no baking prior to reflow soldering. This eliminates pre-bake steps, reduces floor-life tracking overhead, and prevents moisture-induced popcorn cracking during reflow. The S3JAL's MSL Level 1 status is confirmed in the Mechanical Data section of its datasheet and applies to all units supplied in tape-and-reel packaging.

How does the forward voltage (V_F) of the S3JAL vary with temperature and current?

The S3JAL exhibits negative temperature coefficient for V_F: at 3.0A, V_F drops from 1.03V at 25°C to 0.94V at 125°C. At 1.5A, it decreases from 0.95V to 0.84V across the same range. This behavior reduces conduction loss at elevated temperatures, improving thermal stability. These values are measured per datasheet conditions (pulse test, PW = 0.3ms) and reflect actual silicon characteristics of the S3JAL.