Taiwan Semiconductor Corporation SK12B R5G

Overview

SK12B R5G from Taiwan Semiconductor is a 1 A, 20 V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, featuring 0.50 V forward voltage at 1 A and 500 µA reverse leakage at 25°C, optimized for high-efficiency low-voltage DC/DC conversion in compact power adapters.

For engineers reviewing the SK12B R5G datasheet, SK12B R5G pinout, SK12B R5G application, or SK12B R5G equivalent, key selection criteria include its 30 A surge rating, 125°C max junction temperature, guard-ring overvoltage protection, moisture sensitivity level 1 compliance, and RoHS/halogen-free qualification for industrial and consumer power designs.

Technical Context

The SK12B R5G implements a single-die Schottky junction with guard ring structure to enhance transient overvoltage robustness and reduce avalanche-induced failure risk. Its low VF and fast recovery enable high-frequency switching operation without significant conduction loss or reverse recovery charge penalty.

Designed for unidirectional current flow in low-voltage secondary-side rectification, it operates within -55°C to +125°C junction range and delivers stable performance up to 1 A average forward current with thermal resistance of 25°C/W (junction-to-lead), supporting board-level thermal management in space-constrained layouts.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode-indicated band; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance; weight ≈ 0.093 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS12 and SB120, the SK12B R5G offers the lowest typical forward voltage (0.50 V), moisture sensitivity level 1 for zero-bake assembly, and integrated guard ring for enhanced surge immunity-making it optimal for cost-sensitive, high-reliability adapter and lighting applications.

Availability

SK12B R5G is available at Aetrix Electronics and suitable for adapter power supply, USB-C PD charger, and LED driver secondary-side rectification requiring stable component supply and consistent parametric performance across production lots.

Supply support for SK12B R5G 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 global power and protection markets since 1979.

The SK12B R5G belongs to TSC's SKx series of Schottky rectifiers, engineered specifically for high-efficiency, low-profile AC/DC and DC/DC power conversion in consumer, industrial, and lighting applications.

FAQ

What is the maximum junction temperature rating for the SK12B R5G?

The SK12B R5G has a maximum junction temperature (TJ max) of +125°C, verified per absolute maximum ratings in the official datasheet. This allows reliable operation in enclosed power adapters and LED drivers without active cooling. The device maintains specified electrical parameters up to this limit, and thermal design should ensure junction temperature remains below 125°C under worst-case load and ambient conditions. Derating curves confirm usable current capacity down to 0.5 A at 100°C ambient.

Does the SK12B R5G have a guard ring, and what function does it serve?

Yes, the SK12B R5G incorporates a guard ring structure explicitly stated in its features list. This design enhances edge termination robustness, improving resistance to voltage transients and localized avalanche breakdown during line surges or switching spikes. In practice, this increases reliability in SMPS applications exposed to ESD or lightning-induced surges without requiring external snubbers. The guard ring is integral to the die layout-not an add-on feature-and contributes directly to the device's 10,000 V/µs dV/dt rating.

What is the forward voltage specification for SK12B R5G at 1 A and 25°C?

The forward voltage (VF) for SK12B R5G is specified as 0.50 V (typical) at IF = 1 A and TJ = 25°C, per the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) to minimize self-heating. At elevated temperatures (e.g., 100°C), VF decreases slightly due to Schottky diode physics, remaining below 0.45 V. This low VF directly reduces conduction losses and improves system efficiency compared to higher-VF alternatives like standard PN diodes.

Is the SK12B R5G RoHS and halogen-free compliant?

Yes, the SK12B R5G is RoHS compliant and halogen-free in accordance with IEC 61249-2-21, as confirmed in the FEATURES section of the official datasheet. The molding compound contains no brominated or chlorinated flame retardants, and lead content is below 1000 ppm. This compliance supports market access in EU, China, Korea, and other regions enforcing strict environmental regulations, and eliminates concerns about corrosive gas emissions during high-temperature reflow or field operation.

What packaging format is used for SK12B R5G, and how many units are per reel?

The SK12B R5G is supplied in DO-214AA (SMB) package on 3,000-unit tape-and-reel format, as specified in the ORDERING INFORMATION section. The reel meets EIA-481 standards and is compatible with standard SMT pick-and-place equipment. Each reel includes moisture barrier bag with desiccant and humidity indicator card, reflecting its J-STD-020 Level 1 classification-no dry pack or baking is required prior to assembly.