Taiwan Semiconductor Corporation ES1A

Overview

ES1A from Taiwan Semiconductor is a 1 A, 50 V repetitive peak reverse voltage super fast surface-mount rectifier in DO-214AC (SMA) package, featuring 35 ns reverse recovery time, 0.95 V max forward voltage at 1 A, and 5 µA max reverse leakage at 25°C - used in DC-DC converters and snubber circuits.

For engineers reviewing the ES1A datasheet, ES1A pinout, ES1A application, or ES1A equivalent, key selection criteria include its 50 V V_RRM, 30 A I_FSM, 150°C junction temperature rating, glass-passivated junction, and J-STD-020 Level 1 moisture sensitivity - critical for high-efficiency switching power supplies.

Technical Context

The ES1A is a single-die, unidirectional silicon rectifier optimized for high-frequency switching applications. Its super fast recovery (t_rr = 35 ns) minimizes switching losses, while the DO-214AC (SMA) package supports automated placement and meets UL 94V-0 flammability requirements.

It operates across –55°C to +150°C junction temperature range with R_θJL = 35°C/W and R_θJA = 85°C/W thermal resistance. The cathode band indicates polarity, and matte tin-plated leads comply with J-STD-002 solderability standards.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration. Cathode indicated by molded band on body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R06 and MBR150, the ES1A uniquely balances 50 V V_RRM, 150°C T_J rating, and 35 ns t_rr in a cost-effective SMA package - making it ideal for thermally constrained, mid-power DC-DC and lighting applications where voltage margin and temperature resilience are prioritized over ultra-low V_F.

Availability

ES1A is available at Aetrix Electronics and suitable for DC–DC converters, snubber circuits, and LED lighting applications requiring stable component supply, long-term BOM continuity, and RoHS-compliant sourcing.

Supply support for ES1A 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 industrial, computing, and consumer markets since 1979.

The ES1A belongs to TSC's ES1x super fast rectifier family, engineered specifically for high-frequency switching power supplies where low recovery time, robust surge capability, and reliable surface-mount performance are essential.

FAQ

What is the maximum junction temperature rating for the ES1A?

The ES1A has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet. This allows operation in thermally demanding environments such as enclosed LED drivers or industrial DC-DC modules. Derating curves confirm usable current capacity down to 0.5 A at 125°C ambient, ensuring design margin for ES1A in real-world thermal layouts.

Does the ES1A have a specified reverse recovery time, and how is it measured?

Yes, the ES1A specifies a reverse recovery time (t_rr) of 35 ns maximum, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per JEDEC test conditions. This value is confirmed in the Electrical Specifications section of the Taiwan Semiconductor ES1A–ES1J datasheet (Version O2112). The 35 ns t_rr enables efficient operation in switching frequencies up to 500 kHz without significant recovery-related losses in ES1A-based designs.

Is the ES1A RoHS and halogen-free compliant?

Yes, the ES1A is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the Features section of the Taiwan Semiconductor ES1A–ES1J datasheet. The molding compound and plating meet these environmental standards, and the device carries appropriate marking per regulatory requirements - confirming full compliance for ES1A in EU and global green electronics programs.

What is the moisture sensitivity level (MSL) of the ES1A, and what does it mean for PCB assembly?

The ES1A has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly onto PCBs without pre-baking. This simplifies manufacturing logistics and reduces risk of popcorning during reflow. The Level 1 rating applies to the standard tape-and-reel packaging (7,500 units) and is validated for ES1A in Taiwan Semiconductor's qualification reports.

What package type does the ES1A use, and are its dimensions standardized?

The ES1A uses the DO-214AC (SMA) package, a JEDEC-standardized surface-mount outline with defined mechanical dimensions and pad layout recommendations provided in the Taiwan Semiconductor datasheet. Its footprint matches industry-standard SMA footprints, enabling drop-in compatibility with existing PCB designs using other DO-214AC rectifiers - a key feature confirmed for ES1A in the Package Outline Dimensions section.