Taiwan Semiconductor Corporation SS12 R3G

Overview

SS12 R3G from Taiwan Semiconductor is a 1A, 20V Schottky barrier surface-mount rectifier in DO-214AC (SMA) package, featuring 0.50 V forward voltage at 1A/25°C, 40 A 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 SS12 R3G datasheet, SS12 R3G pinout, SS12 R3G application, or SS12 R3G equivalent, key selection criteria include forward voltage drop at operating temperature, reverse leakage at rated V_RRM, thermal resistance (R_θJL = 28°C/W), surge capability, and RoHS/halogen-free compliance for high-volume consumer power supplies.

Technical Context

The SS12 R3G implements a single-die Schottky junction optimized for low forward conduction loss and fast switching in unidirectional DC output paths. Its guard ring structure enhances ruggedness against transient overvoltage events without requiring external snubbers.

Rated for 20 V repetitive peak reverse voltage (V_RRM) and 14 V RMS reverse voltage, it operates with ≤200 μA reverse leakage at 25°C and maintains stable VF down to –55°C, supporting wide ambient temperature deployment in space-constrained power stages.

Key Specifications

Pinout & Package

DO-214AC (SMA) surface-mount package with molded plastic body (UL 94V-0), matte tin-plated leads, cathode indicated by band. Weight: 0.060 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB120 and VS-1EQH02HM3/85A, the SS12 R3G offers the lowest thermal resistance (28°C/W) and highest surge rating (40 A) in its voltage class, making it optimal for high-reliability, thermally constrained consumer power supplies where long-term conduction loss and surge margin are prioritized.

Availability

SS12 R3G is available at Aetrix Electronics and suitable for switching mode power supplies, USB-C adapters, and monitor auxiliary power circuits requiring stable component supply and J-STD-020 Level 1 moisture handling.

Supply support for SS12 R3G 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, including Schottky rectifiers, MOSFETs, and TVS diodes, with global distribution and AEC-Q qualified product lines.

The SS12 R3G belongs to TSC's SS1x Schottky rectifier family designed specifically for high-efficiency, low-profile AC/DC and DC/DC conversion in consumer and industrial power supplies where thermal performance and surge resilience are critical.

FAQ

What is the maximum junction temperature rating for SS12 R3G?

The SS12 R3G has a maximum junction temperature (T_J) rating of +125°C, verified per absolute maximum ratings table in the official TSC datasheet R2305. This allows continuous operation in thermally dense environments such as enclosed power adapters or set-top box internal supplies without derating below 1 A forward current, provided lead temperature remains ≤75°C per JEDEC guidelines. The SS12 R3G must not be operated beyond this limit to ensure long-term reliability.

Does SS12 R3G meet RoHS and halogen-free requirements?

Yes, the SS12 R3G is certified RoHS compliant and halogen-free per IEC 61249-2-21 and EU Directive 2011/65/EU, as explicitly stated in the "Features" section of the TSC SS12–SS115 datasheet R2305. The molding compound contains no brominated flame retardants or chlorine-based additives, and terminal plating uses matte tin only-no lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE compounds are present in the SS12 R3G construction.

What is the forward voltage of SS12 R3G at 100°C junction temperature?

The SS12 R3G exhibits a typical forward voltage of 0.40 V at 1 A and 100°C junction temperature, as specified in the "ELECTRICAL SPECIFICATIONS" table of the TSC datasheet R2305. This lower V_F at elevated temperature improves system efficiency during sustained full-load operation compared to room-temperature measurements, and directly supports thermal design margin in enclosed power supplies where ambient temperatures exceed 60°C.

Is SS12 R3G compatible with standard reflow soldering profiles?

Yes, the SS12 R3G is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and placed directly into standard Pb-free reflow profiles (e.g., IPC/JEDEC J-STD-020D) without pre-baking. Its matte tin-plated leads comply with J-STD-002 for solderability, and the UL 94V-0 molded body withstands peak reflow temperatures up to 260°C for ≤10 seconds-fully compatible with automated SMT assembly for SS12 R3G.

What is the reverse leakage current of SS12 R3G at rated 20 V reverse voltage?

At 25°C junction temperature and 20 V reverse voltage (V_R), the SS12 R3G exhibits a maximum reverse leakage current (I_R) of 200 μA, as confirmed in the "ELECTRICAL SPECIFICATIONS" table of the TSC datasheet R2305. At 100°C, leakage rises to 6 mA-still within safe operational limits for most SMPS feedback and bias networks. This low leakage ensures minimal standby power loss in always-on auxiliary rails powered by SS12 R3G.