Taiwan Semiconductor Corporation SK19BHR5G

Overview

SK19BHR5G from Taiwan Semiconductor is a 1 A, 90 V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, featuring 0.85 V forward voltage at 1 A and 100 µA reverse leakage at 25°C, designed for high-efficiency DC/DC converters and AC/DC adapters.

For engineers reviewing the SK19BHR5G datasheet, SK19BHR5G pinout, SK19BHR5G application, or SK19BHR5G equivalent, key selection criteria include its 90 V repetitive peak reverse voltage, 30 A surge current rating, 125°C maximum junction temperature, guard ring overvoltage protection, and RoHS/halogen-free compliance for industrial power supply designs.

Technical Context

The SK19BHR5G operates as a single-die Schottky rectifier with low forward voltage drop optimized for high-frequency switching applications. Its 10,000 V/µs critical rate of rise of off-state voltage supports fast-switching topologies without parasitic turn-on.

Thermal performance is defined by a 25°C/W junction-to-lead thermal resistance and operation up to 125°C junction temperature. Polarity is indicated by a cathode band, and the device meets JESD201 Class 2 whisker test and J-STD-020 Level 1 moisture sensitivity requirements.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount plastic case with matte tin-plated leads, UL 94V-0 molding compound, cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SK19BHR5G, SS19-E3/5AT offers marginally lower VF but higher IR, while SB190 trades minor VF increase for +25°C junction rating-enabling longer lifetime in sealed or high-ambient deployments without layout change.

Availability

SK19BHR5G is available at Aetrix Electronics and suitable for AC/DC adapters, DC/DC converters, and LED lighting applications requiring stable component supply, consistent parametric performance, and full RoHS/halogen-free compliance.

Supply support for SK19BHR5G 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 semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs, with global distribution and AEC-Q200 qualified lines.

The SK1xB series targets cost-sensitive, high-volume power conversion applications where low VF, robust surge capability, and JEDEC-standard packaging are essential-particularly in consumer, industrial, and lighting markets.

FAQ

What is the maximum junction temperature rating for SK19BHR5G?

The SK19BHR5G has a maximum junction temperature (TJ max) of 125°C, as specified in the Absolute Maximum Ratings table. This rating applies under continuous DC operation and defines the upper thermal limit for reliable long-term performance. Derating curves in the datasheet show forward current must be reduced above 25°C ambient to maintain this junction temperature, especially when mounted on standard FR-4 PCBs without additional heatsinking. The SK19BHR5G is not rated for 150°C operation like some higher-voltage variants in the same family.

Does SK19BHR5G have a guard ring structure, and what benefit does it provide?

Yes, the SK19BHR5G incorporates a guard ring structure explicitly noted in the FEATURES section of the datasheet. This design feature prevents premature avalanche breakdown at the die periphery under high reverse-bias stress, thereby improving voltage ruggedness and transient immunity. In practical terms, it enhances reliability during line surges or inductive switching events common in SMPS and adapter applications-reducing failure risk without requiring external snubbers or voltage clamping components.

What is the forward voltage specification for SK19BHR5G at 1 A and 25°C?

The forward voltage (VF) for SK19BHR5G is specified as 0.85 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. It reflects the device's low conduction loss advantage over standard PN-junction rectifiers and directly contributes to improved system efficiency-especially in high-frequency, high-duty-cycle converter topologies where conduction losses dominate.

Is SK19BHR5G compatible with lead-free reflow soldering processes?

Yes, SK19BHR5G is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its moisture sensitivity level is rated at Level 1 per J-STD-020-meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without baking. The DO-214AA (SMB) package uses UL 94V-0 compliant molding compound, ensuring stability through standard Pb-free thermal profiles (peak ~260°C).

What is the reverse leakage current of SK19BHR5G at rated voltage and 125°C?

At rated reverse voltage (90 V) and junction temperature of 125°C, the SK19BHR5G exhibits a maximum reverse leakage current (IR) of 2 mA, as stated in the ELECTRICAL SPECIFICATIONS table. This value is measured under 30 ms pulse conditions. While significantly higher than the 100 µA spec at 25°C, it remains within safe operational limits for most power supply applications-particularly where thermal management maintains average junction temperature below 100°C during steady-state operation.