Taiwan Semiconductor Corporation SK52C R7G

Overview

SK52C from Taiwan Semiconductor is a 5A, 20V Schottky barrier surface-mount rectifier in DO-214AB (SMC) package, optimized for high-efficiency switching power supplies with low forward voltage (0.55 V at 5 A, 25°C), high surge capability (120 A), and junction temperature up to 150°C. It serves as the primary output rectifier in compact AC/DC adapters and DC/DC converters.

For engineers reviewing the SK52C datasheet, SK52C pinout, SK52C application, or SK52C equivalent, key selection criteria include its 20 V repetitive peak reverse voltage, 13°C/W junction-to-lead thermal resistance, moisture sensitivity level 1 rating, RoHS/halogen-free compliance, and cathode-band polarity marking - all critical for thermal reliability and automated assembly in space-constrained power designs.

Technical Context

The SK52C is a single-die Schottky rectifier with guard ring structure for enhanced overvoltage ruggedness and JESD201 Class 2 whisker resistance. Its low VF enables reduced conduction loss in high-frequency SMPS topologies operating at 100 kHz–1 MHz.

Thermal performance is defined for PCB mounting on a 16 mm × 16 mm copper pad: R_θJL = 13°C/W (junction-to-lead), R_θJA = 53°C/W (junction-to-ambient), and R_θJC = 16°C/W (junction-to-case), supporting continuous 5 A operation under controlled board-level cooling.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount plastic case with matte tin-plated leads, cathode indicated by band. Weight: 0.210 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS52 and MBR520, the SK52C delivers superior transient ruggedness via its guard ring and better thermal coupling (R_θJL = 13°C/W), making it preferred for high-reliability, high-density adapter and industrial PSU designs where layout space and thermal headroom are constrained.

Availability

SK52C is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, and PCB-mounted DC/DC modules requiring stable component supply, consistent parametric performance, and full RoHS/halogen-free compliance.

Supply support for SK52C 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 SK52C belongs to TSC's SK5xC Schottky rectifier family, engineered specifically for high-efficiency, high-reliability secondary-side rectification in compact switching power supplies - balancing low V_F, rugged surge capability, and automated assembly readiness.

FAQ

What is the maximum junction temperature rating for the SK52C?

The SK52C has a maximum junction temperature (T_J) of +150°C, verified per absolute maximum ratings in the official TSC datasheet (Version S2311). This rating allows uninterrupted 5 A operation in ambient temperatures up to 85°C when mounted on a 16 mm × 16 mm Cu pad, leveraging its R_θJA = 53°C/W thermal resistance. The SK52C must not exceed this limit to ensure long-term reliability and parameter stability.

Does the SK52C have a guard ring, and why does it matter?

Yes, the SK52C incorporates a guard ring structure explicitly stated in its features list. This design enhances edge termination robustness, improving resistance to voltage-induced avalanche breakdown during fast transients - critical in high-dV/dt SMPS circuits where dV/dt reaches 10,000 V/µs. The guard ring directly contributes to the device's overvoltage protection capability, distinguishing it from basic Schottky rectifiers without such protection.

What is the forward voltage of the SK52C at full rated current?

The SK52C exhibits a maximum forward voltage (V_F) of 0.55 V at I_F = 5 A and T_J = 25°C, as specified in the Electrical Specifications table of the TSC datasheet. This value is measured under pulsed conditions (PW = 0.3 ms) and represents the conduction loss baseline for efficiency calculations. At higher junction temperatures (e.g., 125°C), V_F decreases slightly due to Schottky diode physics, but remains within design margins for thermal modeling.

Is the SK52C suitable for lead-free reflow soldering?

Yes, the SK52C is qualified for lead-free reflow soldering per J-STD-002. Its matte tin-plated leads are fully compatible with Pb-free SAC305 profiles (peak temperature ≤260°C), and its moisture sensitivity level is rated Level 1 per J-STD-020 - meaning it can be stored indefinitely in ambient conditions and placed directly onto the SMT line without baking or dry-pack handling.

How does the SK52C compare to the SK53C in terms of voltage rating and interchangeability?

The SK52C is rated for 20 V V_RRM, while the SK53C is rated for 30 V - they are distinct members of the same SK5xC family but are not interchangeable without circuit review. Substituting SK53C for SK52C introduces unnecessary voltage overhead and may affect thermal performance due to higher V_F (0.55 V typ for SK52C vs. 0.55 V max for SK53C, with typical values diverging at higher currents). Use SK52C only where 20 V blocking is sufficient and validated in the target design.