Taiwan Semiconductor Corporation SK59C V7G

Overview

SK59C from Taiwan Semiconductor is a 5A, 90V Schottky barrier surface-mount rectifier in DO-214AB (SMC) package, optimized for high-efficiency switching power supplies with low forward voltage (0.85 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 AC/DC adapters and DC/DC converters.

For engineers reviewing the SK59C datasheet, SK59C pinout, SK59C application, or SK59C equivalent, key selection criteria include its 90 V repetitive peak reverse voltage, 0.85 V forward drop at rated current, 0.3 mA reverse leakage at 25°C, thermal resistance (R_θJL = 13°C/W), and DO-214AB mechanical compatibility with automated SMT assembly.

Technical Context

The SK59C employs a single-die Schottky structure with guard ring overvoltage protection, enabling stable operation under transient voltage stress. Its low forward voltage and high I_FSM (120 A) support high-frequency, high-efficiency topologies such as synchronous flyback and active clamp forward converters.

Designed for surface-mount use on standard PCBs with 16 mm × 16 mm copper pads, it meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1-requiring no bake prior to reflow. Polarity is marked by a cathode band on the molded case.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount plastic case with matte tin-plated leads, cathode indicated by molded 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 VS-50SQ030NTR-M3 and SB590-E3/54, the SK59C uniquely balances 90 V blocking capability, 0.85 V forward drop, and DO-214AB thermal performance-making it optimal for 48–90 V output SMPS where both voltage margin and efficiency are critical.

Availability

SK59C is available at Aetrix Electronics and suitable for laptop AC adapters, industrial PoE PD converters, LED driver power stages, and USB-C power delivery modules requiring stable component supply across production lifecycles.

Supply support for SK59C 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 since 1979.

The SK52C–SK520C family was developed specifically for high-efficiency, high-reliability AC/DC and DC/DC power conversion, targeting cost-sensitive yet thermally demanding applications in consumer, industrial, and lighting markets.

FAQ

What is the maximum junction temperature rating for the SK59C?

The SK59C has a maximum junction temperature (T_J) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet (Version S2311). This rating allows uninterrupted operation in enclosed, convection-cooled environments typical of wall adapters and LED drivers. Derating begins above 75°C ambient, and thermal design must ensure junction temperature remains below 150°C under worst-case load and ambient conditions. The SK59C's R_θJL of 13°C/W supports this via efficient PCB copper conduction.

Does the SK59C have a specified moisture sensitivity level (MSL)?

Yes, the SK59C is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/85% RH and requires no floor life limitation or pre-reflow baking. This is confirmed in the "MECHANICAL DATA" section of the Taiwan Semiconductor SK52C–SK520C datasheet (S2311). The MSL Level 1 classification simplifies handling in automated SMT lines and eliminates process steps associated with moisture-sensitive components, directly benefiting high-volume manufacturing of SK59C-based power supplies.

What is the forward voltage of the SK59C at 5 A and 125°C junction temperature?

The SK59C datasheet does not specify forward voltage (V_F) at 125°C and 5 A; only the 25°C value (0.85 V max) is provided in the ELECTRICAL SPECIFICATIONS table. However, Figure 10 (Typical Forward Characteristics) shows V_F ≈ 0.78 V at 5 A and 125°C for the SK59C–SK510C group. This reduction reflects the negative temperature coefficient of Schottky diodes. Designers should reference Figure 10-not the 25°C table-for thermal-aware loss estimation in the SK59C.

Is the SK59C RoHS and halogen-free compliant?

Yes, the SK59C is explicitly stated as RoHS Compliant and Halogen-Free in the FEATURES section of the Taiwan Semiconductor SK52C–SK520C datasheet (S2311). Compliance is verified per EU Directive 2011/65/EU (RoHS 2) and IEC 61249-2-21 for halogen content (<900 ppm Br, <900 ppm Cl, total ≤1500 ppm). This makes the SK59C suitable for export to EU, China, South Korea, and other regulated markets requiring full substance declarations.

What is the cathode marking method on the SK59C package?

The SK59C uses a molded cathode band on the DO-214AB (SMC) plastic case to indicate polarity, as documented in the MECHANICAL DATA section and PACKAGE OUTLINE DIMENSIONS diagram (S2311). The band is located near one end of the body and aligns with the cathode terminal. This marking is compatible with automated optical inspection (AOI) and pick-and-place vision systems. No laser marking or ink is used-ensuring long-term legibility and reflow stability. Correct orientation is essential to prevent reverse-bias failure in the SK59C.