Taiwan Semiconductor Corporation TSD1G

Overview

TSD1G from Taiwan Semiconductor is a 1 A, 400 V repetitive peak reverse voltage glass-passivated standard rectifier diode with ESD immunity up to 25 kV (air discharge, ISO 10605), housed in a DO-214AC (SMA) package and rated for junction temperatures up to 175 °C. It delivers low forward voltage drop (1.25 V max at 1 A, 25 °C) and high surge current capability (40 A, 8.3 ms half-sine), making it suitable for compact, high-reliability SMPS secondary-side rectification.

For engineers reviewing the TSD1G datasheet, TSD1G pinout, TSD1G application, or TSD1G equivalent, key selection criteria include its 400 V V_RRM, 1 A average forward current rating, ESD robustness per AEC-Q101-001 H3B and IEC 61000-4-2 Level 4, thermal resistance (R_θJA = 86 °C/W on 5 mm × 5 mm Cu pad), and DO-214AC mechanical compatibility with automated placement.

Technical Context

The TSD1G is a single-die, planar, glass-passivated silicon rectifier optimized for high-voltage, medium-current switching applications. Its junction-to-ambient thermal resistance of 86 °C/W (on standard test board) and junction-to-lead resistance of 39 °C/W support reliable operation under sustained 1 A DC load with minimal heatsinking.

ESD immunity is validated per three standards: AEC-Q101-001 (H3B, ≥8 kV contact), IEC 61000-4-2 (Level 4, ≥15 kV air), and ISO 10605 (L4, ≥25 kV air), confirming suitability for automotive-adjacent and industrial environments where electrostatic discharge events are frequent.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration. Cathode indicated by band. Matte tin-plated leads, J-STD-002 solderable. 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 STTH1R04 and ES1D, the TSD1G uniquely combines 400 V rating, 1 A current, and certified 25 kV ESD immunity in a DO-214AC package-enabling simplified BOMs and higher field reliability in lighting, adapters, and industrial converters where electrostatic stress is present.

Availability

TSD1G is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and USB-C adapters requiring stable component supply, full traceability, and compliance with RoHS and halogen-free standards.

Supply support for TSD1G 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, MOSFETs, and ESD protection devices.

The TSD1G belongs to TSC's high-reliability standard rectifier family, designed specifically for applications demanding enhanced ESD resilience, extended temperature operation, and compatibility with automated SMT assembly lines.

FAQ

What is the maximum junction temperature rating for the TSD1G?

The TSD1G has a maximum junction temperature (T_JMAX) of +175 °C and a minimum of –55 °C. This wide operating range allows the TSD1G to function reliably in thermally demanding environments such as enclosed LED drivers and automotive-adjacent power modules without requiring additional thermal derating beyond standard SOA curves.

Does the TSD1G meet automotive qualification standards?

Yes, the TSD1G is qualified per AEC-Q101-001 (H3B class) for human-body-model ESD, confirming its suitability for automotive infotainment, body electronics, and ADAS auxiliary power supplies. However, it is not intended for safety-critical systems like airbag controllers or brake ECUs, as explicitly stated in TSC's notice.

What is the marking code printed on the TSD1G device?

The TSD1G device is marked with "TSD1G" as the part number identifier, along with a green compound indicator ("G"), date code ("YW"), and factory code ("F") per the official marking diagram. This ensures unambiguous identification and traceability throughout the supply chain and manufacturing process.

How does the ESD performance of the TSD1G compare to generic rectifiers?

The TSD1G achieves ≥25 kV air-discharge ESD immunity per ISO 10605 L4-far exceeding typical unqualified rectifiers (<2 kV). This eliminates the need for external TVS diodes in many adapter and lighting designs, reducing component count and board space while improving long-term field reliability against handling and environmental ESD events.

Is the TSD1G compatible with lead-free reflow soldering processes?

Yes, the TSD1G features matte tin-plated leads compliant with J-STD-002 and is rated for lead-free reflow soldering. Its DO-214AC (SMA) package is qualified for peak reflow temperatures up to 260 °C, and its MSL level 1 rating means it can be stored indefinitely before assembly without baking.