Taiwan Semiconductor Corporation S2JALH

Overview

S2JALH from Taiwan Semiconductor is a 2 A, 600 V standard surface-mount rectifier diode with glass-passivated junction, AEC-Q101 qualified for automotive use, and housed in a low-profile Thin SMA package. It delivers 50 A surge current capability, 14 °C/W junction-to-lead thermal resistance, and supports freewheeling and snubber functions in DC/DC converters.

For engineers reviewing the S2JALH datasheet, S2JALH pinout, S2JALH application, or S2JALH equivalent, key selection criteria include its 600 V repetitive peak reverse voltage, 2 A average forward current rating, 0.98 V max forward voltage at 2 A / 25°C, AEC-Q101 qualification, and Thin SMA package compatibility with automated placement.

Technical Context

The S2JALH is a single-die, unidirectional silicon rectifier optimized for high-reliability power conversion. Its glass-passivated junction ensures stable reverse leakage (≤1 µA at 25°C, ≤33 µA at 125°C) and robustness against moisture and mechanical stress.

Thermal performance is defined by R_θJL = 14 °C/W and R_θJA = 74 °C/W on a 5 mm × 5 mm Cu pad PCB. The device operates across –55°C to +150°C junction temperature range and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.

Key Specifications

Pinout & Package

Package: Thin SMA - Surface-mount, low-profile (max height 2.3 mm), matte tin-plated leads, polarity indicated by cathode band, UL 94V-0 molding compound, weight ≈ 0.029 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R06S, the S2JALH offers superior thermal performance and smaller footprint; compared with SB260-E3/5BT, it provides six times the reverse voltage rating and automotive qualification-making S2JALH the only valid option for 600 V automotive rectification.

Availability

S2JALH is available at Aetrix Electronics and suitable for automotive power supplies, industrial DC/DC converters, and snubber networks requiring stable component supply, AEC-Q101 compliance, and consistent Thin SMA packaging.

Supply support for S2JALH 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 automotive, industrial, and consumer markets since 1979.

The S2JALH belongs to TSC's AEC-Q101-qualified Thin SMA rectifier family, engineered specifically for high-reliability surface-mount power conversion in space-constrained and thermally demanding environments.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S2JALH?

The S2JALH has a V_RRM of 600 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version B2103). This rating defines the highest reverse voltage the device can block repeatedly without breakdown and is validated across the full operating temperature range. Exceeding 600 V risks irreversible avalanche failure. The S2JALH is part of the S2DALH–S2MALH series where 'J' explicitly denotes the 600 V grade.

Is the S2JALH qualified for automotive applications?

Yes, the S2JALH is AEC-Q101 qualified, as stated in the FEATURES section of the official datasheet. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and unbiased highly accelerated stress testing (uHAST), ensuring reliability in automotive under-hood and chassis-mounted systems. The S2JALH's –55°C to +150°C junction temperature range further supports automotive deployment.

What is the forward voltage (V_F) of the S2JALH at 2 A and 25°C?

The S2JALH exhibits a maximum forward voltage of 0.98 V at 2 A and 25°C, per the Electrical Specifications table. A typical value of 0.91 V is also specified at 1 A / 25°C. These values were measured using a 0.3 ms pulse width test condition and reflect conduction losses critical for thermal design. At 125°C, V_F drops to 0.88 V (typ) / 0.98 V (max), confirming positive temperature coefficient behavior.

What package type does the S2JALH use, and what are its key mechanical properties?

The S2JALH uses the Thin SMA package: a surface-mount, low-profile variant of the standard SMA with max height of 2.3 mm. Key properties include UL 94V-0 flammability-rated molding compound, matte tin-plated leads compliant with J-STD-002, polarity indicated by cathode band, and JESD201 Class 2 whisker resistance. Its weight is approximately 0.029 g, and it is supplied in 14,000-unit tape-and-reel format.

Does the S2JALH have a specified junction-to-ambient thermal resistance (R_θJA)?

Yes, the S2JALH has an R_θJA of 74 °C/W, measured on a standard 5 mm × 5 mm copper pad PCB per JEDEC JESD51-3. This value assumes natural convection and defines the thermal bottleneck from junction to ambient air. For higher-power operation, designers should leverage the lower R_θJL = 14 °C/W to route heat into internal copper layers or thermal vias, as R_θJA alone is insufficient for sustained 2 A loads without board-level thermal enhancement.