Taiwan Semiconductor Corporation SK520CH

Overview

SK520CH from Taiwan Semiconductor is a 5A, 200V Schottky barrier surface-mount rectifier in DO-214AB (SMC) package, designed for high-efficiency low-voltage DC/DC conversion and reverse battery protection. It features 0.95V forward voltage at 5A/25°C, 120A surge capability, AEC-Q101 qualification, and guard ring overvoltage protection.

For engineers reviewing the SK520CH datasheet, SK520CH pinout, SK520CH application, or SK520CH equivalent, key selection criteria include its 200V V_RRM, low VF at high current, thermal resistance (R_θJL = 13°C/W), moisture sensitivity level 1 rating, and suitability for automotive lighting and industrial power supplies.

Technical Context

The SK520CH operates as a single-die Schottky rectifier with unidirectional conduction, optimized for high-frequency switching topologies where low forward voltage drop and fast recovery are critical. Its junction temperature range of –55°C to +150°C and 120A I_FSM support robust operation under transient load conditions.

Thermal performance is defined by R_θJL = 13°C/W and R_θJA = 53°C/W on a 16mm × 16mm Cu pad PCB. Reverse leakage is limited to 0.3mA at 25°C and 5mA at 125°C under rated 200V reverse bias, ensuring stable blocking in elevated ambient environments.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC) - Surface-mount plastic case with matte tin-plated leads, UL 94V-0 molding compound, cathode indicated by band, weight ≈ 0.210g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-50WQ03FN-M3/45 and SB5200-E3/54, the SK520CH delivers optimal balance of 200V blocking, 0.95V forward drop, and 13°C/W junction-to-lead thermal resistance - enabling smaller heatsinking and broader automotive voltage margin than either alternative.

Availability

SK520CH is available at Aetrix Electronics and suitable for automotive lighting, industrial DC/DC converters, and reverse battery protection circuits requiring stable component supply, AEC-Q101 compliance, and long-lifecycle availability.

Supply support for SK520CH 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 automotive, industrial, and consumer markets since 1979.

The SK520CH belongs to TSC's SKxCH Schottky rectifier family, engineered specifically for high-reliability automotive power systems and high-efficiency industrial switching supplies where low VF, surge robustness, and AEC-Q101 validation are mandatory.

FAQ

What is the maximum junction temperature rating for the SK520CH?

The SK520CH has a maximum junction temperature (T_J) of +150°C, verified per absolute maximum ratings in the official datasheet. This rating enables operation in under-hood automotive environments and sealed industrial enclosures. Derating curves confirm usable current capacity down to –55°C ambient, and thermal resistance values (R_θJL = 13°C/W) allow accurate junction temperature estimation in real-world PCB layouts. The SK520CH must not exceed this limit during continuous or pulsed operation.

Is the SK520CH pin-compatible with other devices in the SK5xCH series?

Yes - all SK5xCH devices, including SK520CH, share identical DO-214AB (SMC) package dimensions, lead finish, polarity marking (cathode band), and terminal configuration. Mechanical drawings and pad layout recommendations are uniform across the family. However, electrical parameters such as V_RRM, V_F, and I_R vary by voltage grade, so substitution requires verification of circuit voltage and thermal requirements. The SK520CH itself is not a drop-in replacement for lower-voltage SK52CH–SK515CH without confirming reverse stress margins.

Does the SK520CH require a moisture sensitivity bake before reflow soldering?

No - the SK520CH is rated at Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without baking or dry-pack handling. This eliminates process steps and cost in high-volume SMT lines. The MSL 1 rating is confirmed in the "MECHANICAL DATA" section of the official TSC documentation and applies to all SK5xCH variants including the SK520CH.

What is the reverse leakage current specification for the SK520CH at 125°C?

At T_J = 125°C and rated V_R = 200V, the SK520CH exhibits a maximum reverse leakage current (I_R) of 5 mA, as specified in the "ELECTRICAL SPECIFICATIONS" table. This value is measured using a 30ms pulse test and reflects worst-case blocking behavior under elevated thermal stress. At 25°C, I_R is limited to 0.3 mA - critical for low-power standby modes in automotive modules where quiescent current budgets are tight.

How does the guard ring feature improve reliability of the SK520CH?

The guard ring in the SK520CH enhances edge termination robustness by controlling electric field distribution at the die periphery, preventing premature avalanche breakdown during voltage transients. This design feature directly supports the device's 10,000 V/µs dV/dt rating and contributes to stable 200V V_RRM performance across temperature and lifetime. In automotive applications like alternator rectification or load dump protection, the guard ring mitigates failure modes associated with localized field crowding - a key reason for the SK520CH's AEC-Q101 qualification.