Taiwan Semiconductor Corporation SK34B R5G

Overview

SK34B R5G from Taiwan Semiconductor is a 3A, 40V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, featuring 0.75V max forward voltage at 3A/25°C, 70A surge capability, and 10,000 V/μs critical dV/dt rating. It serves as a high-efficiency output rectifier in low-voltage DC-DC converters and AC-DC adapters.

For engineers reviewing the SK34B R5G datasheet, SK34B R5G pinout, SK34B R5G application, or SK34B R5G equivalent, key selection criteria include its 40V reverse voltage rating, thermal resistance (R_θJL = 23°C/W), moisture sensitivity level 1 compliance, and cathode-band polarity marking-critical for layout validation and reliability assurance in high-density power designs.

Technical Context

The SK34B R5G implements a single-die Schottky junction optimized for low forward voltage drop and fast switching, with no recovery time or minority-carrier storage delay. Its guard ring structure enhances overvoltage ruggedness while maintaining stable leakage performance up to 100°C.

Rated for continuous operation from –55°C to +125°C (with optional +150°C junction limit), it delivers 3A average forward current under natural convection, supported by a 63°C/W junction-to-ambient thermal resistance and UL 94V-0 molded compound housing.

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 JESD201 Class 2 whisker resistance. Weight: 0.100 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS34H and SB340, the SK34B R5G offers a balanced trade-off: higher V_F than alternatives but guaranteed 150°C junction capability and tighter IR control at elevated temperatures-making it preferred for thermally constrained, high-reliability industrial converters where long-term stability outweighs marginal efficiency gain.

Availability

SK34B R5G is available at Aetrix Electronics and suitable for AC-DC adapters, USB-C PD power supplies, and industrial DC-DC modules requiring stable component supply, consistent parametric performance across production lots, and full traceability from wafer to shipment.

Supply support for SK34B 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, automotive, and industrial markets since 1979.

The SK32B–SK320B family was engineered specifically for high-volume, cost-sensitive power conversion applications demanding robust surge immunity, low-profile packaging, and JEDEC-standard reliability-targeting mainstream consumer and industrial SMPS designs.

FAQ

What is the maximum junction temperature rating for the SK34B R5G?

The SK34B R5G is rated for continuous operation up to +125°C junction temperature, with an extended capability of +150°C under specified conditions. This dual-rating allows designers to select thermal derating curves based on application safety margins-critical for enclosed LED drivers or industrial modules where ambient temperatures exceed 85°C. The SK34B R5G datasheet explicitly confirms both limits in its Absolute Maximum Ratings table.

Does the SK34B R5G have a halogen-free construction?

Yes, the SK34B R5G uses halogen-free molding compound compliant with IEC 61249-2-21, verified in the official Taiwan Semiconductor product documentation. This eliminates brominated flame retardants while maintaining UL 94V-0 flammability rating-supporting environmental compliance for export-oriented electronics and green manufacturing initiatives. The SK34B R5G meets RoHS Directive 2011/65/EU without exemptions.

What is the reverse leakage current specification for the SK34B R5G at 100°C?

At T_J = 100°C and rated V_R, the SK34B R5G exhibits a maximum reverse leakage current (I_R) of 5 mA. This value is confirmed in the Electrical Specifications table of the official datasheet and reflects worst-case behavior under elevated thermal stress-essential for evaluating hold-up time and standby power loss in high-temperature environments. The SK34B R5G maintains this spec across its full 40V V_RRM range.

Is the SK34B R5G compatible with lead-free reflow soldering processes?

Yes, the SK34B R5G features matte tin-plated leads qualified per J-STD-002 for solderability and fully compatible with standard lead-free reflow profiles (peak 260°C). Its MSL Level 1 classification means it can be stored indefinitely at ≤30°C/60% RH without baking-eliminating process steps in high-mix SMT lines. The SK34B R5G's mechanical data sheet confirms compliance with IPC/JEDEC J-STD-020.

How does the guard ring feature improve reliability in the SK34B R5G?

The guard ring in the SK34B R5G mitigates edge breakdown by redistributing electric field concentration at the die periphery, increasing ruggedness against voltage transients and ESD events. This design directly improves long-term reliability in noisy industrial environments and enables stable operation during line surges-verified through accelerated life testing per JESD22-A114. The SK34B R5G's guard ring is integral to its 10,000 V/μs dV/dt rating.