Taiwan Semiconductor Corporation S1JAL

Overview

S1JAL from Taiwan Semiconductor is a 1A, 600V standard surface-mount silicon rectifier diode in a Thin SMA package, featuring glass-passivated junction, 30A surge rating (8.3ms), and 150°C max junction temperature; used in DC-DC converters and switching-mode inverters where compact size and reliable reverse blocking are required.

For engineers reviewing the S1JAL datasheet, S1JAL pinout, S1JAL application, or S1JAL equivalent, key selection criteria include repetitive peak reverse voltage (600V), forward voltage at 1A/25°C (≤1.10V), reverse leakage at 125°C (≤50µA), thermal resistance (R_θJA = 82°C/W), and Thin SMA package compatibility with automated placement.

Technical Context

The S1JAL is a single-die, unidirectional silicon PN junction rectifier optimized for general-purpose AC/DC and DC/DC conversion. Its glass-passivated chip junction ensures stable performance under humidity and thermal cycling, while the cathode-band polarity marking enables unambiguous orientation during PCB assembly.

Designed for operation up to 150°C junction temperature, it delivers 600V V_RRM with 1A average forward current and withstands 30A non-repetitive surge (8.3ms) or 100A (1.0ms). Thermal performance is characterized on a 5mm × 5mm copper pad test board per JEDEC standards.

Key Specifications

Pinout & Package

Package: Thin SMA (Surface Mount Axial), low-profile, RoHS-compliant, halogen-free molding compound (UL 94V-0), pure tin-plated leads, moisture sensitivity level 1 (J-STD-020).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1L06U and ES1J, the S1JAL offers optimal balance of low VF (≤1.10V), industry-standard Thin SMA footprint, and J-STD-020 Level 1 handling-making it ideal for space-constrained, thermally managed, and high-volume automated production environments.

Availability

S1JAL is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial control modules requiring stable component supply, consistent parametric performance, and full traceability across production batches.

Supply support for S1JAL 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 for industrial and consumer markets.

The S1JAL belongs to TSC's S1DAL–S1MAL standard rectifier family, engineered for cost-effective, high-reliability AC/DC and DC/DC power conversion in space-constrained surface-mount applications.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S1JAL?

The S1JAL has a maximum repetitive peak reverse voltage (V_RRM) of 600 V, as specified in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version B2103). This rating ensures reliable blocking of reverse voltage transients in 230VAC-derived supplies and medium-voltage DC-DC stages. The S1JAL must not be operated above this voltage under repetitive conditions to avoid avalanche breakdown or degradation.

What is the forward voltage (V_F) of the S1JAL at 1A and 25°C?

The forward voltage (V_F) of the S1JAL is guaranteed ≤1.10 V at 1A forward current and 25°C junction temperature, with a typical value of 0.96 V. This specification is measured under pulsed conditions (PW = 0.3 ms) and directly impacts conduction losses and thermal rise in the S1JAL during continuous operation. Designers should reference the Electrical Specifications table in the S1JAL datasheet for derated V_F values at elevated temperatures.

Is the S1JAL compatible with lead-free reflow soldering processes?

Yes, the S1JAL is fully compatible with lead-free reflow soldering. Its pure tin-plated leads meet J-STD-002 solderability requirements, and its Thin SMA package is rated for peak reflow temperatures up to 260°C per J-STD-020. The S1JAL carries Moisture Sensitivity Level 1 certification, meaning it can be mounted directly from dry pack without pre-baking-reducing process steps and ensuring robust intermetallic formation during SMT assembly.

What is the junction-to-ambient thermal resistance (R_θJA) of the S1JAL?

The junction-to-ambient thermal resistance (R_θJA) of the S1JAL is 82°C/W when mounted on a standard JEDEC test board with a 5 mm × 5 mm copper pad. This value assumes natural convection and is critical for estimating steady-state junction temperature rise under load. For accurate thermal design, the S1JAL's R_θJA must be used alongside actual power dissipation (P = I_F × V_F) and ambient temperature to ensure T_J remains ≤150°C.

Does the S1JAL have a cathode band marking, and how is polarity identified?

Yes, the S1JAL uses a visible cathode band to indicate polarity, as shown in the Marking Diagram section of the Taiwan Semiconductor datasheet. The banded end corresponds to the cathode terminal, which must be connected toward the higher-potential node in forward conduction (e.g., output rail or capacitor positive). Correct orientation is essential-reverse installation of the S1JAL will block forward current and may cause system failure or overheating under reverse bias.