Taiwan Semiconductor Corporation SS14HR3G

Overview

SS14HR3G from Taiwan Semiconductor is a 1A, 40V Schottky barrier surface-mount rectifier in DO-214AC (SMA) package, featuring 0.50 V forward voltage at 1A/25°C, 40A peak surge current, and junction temperature rating up to +125°C. It serves as a low-loss freewheeling or output rectifier in compact DC/DC converters and AC/DC adapters.

For engineers reviewing the SS14HR3G datasheet, SS14HR3G pinout, SS14HR3G application, or SS14HR3G equivalent, key selection criteria include its 40V V_RRM, low VF at high temperature, moisture sensitivity level 1 compliance, guard ring overvoltage protection, and suitability for automated SMT assembly in space-constrained power supplies.

Technical Context

The SS14HR3G implements a single-die Schottky junction optimized for fast switching and minimal conduction loss in low-voltage, high-efficiency rectification. Its 28°C/W junction-to-lead thermal resistance and 88°C/W junction-to-ambient rating support reliable operation under continuous 1A load without forced cooling.

Designed with a cathode band polarity indicator and matte tin-plated leads compliant with J-STD-002 solderability, the device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements - enabling use in consumer and industrial power supplies requiring long-term reliability and RoHS/halogen-free compliance.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount plastic case with cathode band marking; dimensions per JEDEC DO-214AC, weight ≈ 0.060 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS14HR3G, SS14-E3/5AT offers near-identical electrical and thermal performance with minor VF variation, while SB140 requires PCB redesign due to SMB packaging and provides no guard ring - making SS14HR3G preferable for compact, transient-prone adapter and SMPS designs.

Availability

SS14HR3G is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and DC/DC converters requiring stable component supply, RoHS-compliant packaging, and MSL Level 1 assembly readiness.

Supply support for SS14HR3G 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 devices, and MOSFETs for industrial and consumer markets.

The SS1x series was developed specifically for cost-sensitive, high-volume power conversion applications demanding low VF, robust surge capability, and full SMT manufacturability - targeting adapter, monitor, and set-top box power stages.

FAQ

What is the maximum junction temperature rating for SS14HR3G?

The SS14HR3G has a maximum junction temperature (T_J) rating of +125°C, validated per absolute maximum ratings table. This allows continuous 1A operation in ambient temperatures up to +85°C when mounted on standard FR-4 PCB with ≥1 cm² copper pour, without requiring forced airflow or additional heatsinking. The SS14HR3G datasheet confirms this rating applies across the full voltage range of the SS1x family.

Does SS14HR3G have a guard ring structure, and what is its functional benefit?

Yes, SS14HR3G incorporates a guard ring structure explicitly stated in its features list. This design enhances edge termination robustness, increasing resistance to avalanche breakdown during voltage transients - particularly beneficial in flyback converter secondary circuits where dV/dt can exceed 10,000 V/µs. The guard ring eliminates need for external RC snubbers in many 40V-class applications.

What is the forward voltage of SS14HR3G at elevated temperature?

At 1A forward current and 100°C junction temperature, the SS14HR3G exhibits a typical forward voltage of 0.40 V - lower than its 25°C value of 0.50 V. This negative temperature coefficient improves thermal stability in high-temperature environments and reduces conduction loss under load, unlike silicon PN diodes whose V_F increases with temperature.

Is SS14HR3G suitable for reflow soldering without moisture preconditioning?

Yes, SS14HR3G is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/60% RH and requires no dry packing or baking prior to standard Pb-free reflow. This simplifies manufacturing logistics and ensures consistent solder joint quality in high-throughput SMT lines using IPC/JEDEC-compliant profiles.

What is the reverse leakage current specification for SS14HR3G at 100°C?

At rated reverse voltage (40V) and 100°C junction temperature, SS14HR3G specifies a maximum reverse leakage current (I_R) of 6 mA. This value is confirmed in the Electrical Specifications table and reflects worst-case behavior under thermal stress - critical for evaluating standby power loss in always-on auxiliary supplies where leakage directly impacts total system quiescent current.