Taiwan Semiconductor Corporation S5KB

Overview

S5KB from Taiwan Semiconductor is a 5A, 800V standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring glass-passivated junction, low forward voltage drop (max 1.1V at 5A), and 200A surge capability-used in AC/DC front-end rectification for switching mode power supplies.

For engineers reviewing the S5KB datasheet, S5KB pinout, S5KB application, or S5KB equivalent, key selection criteria include its 800V repetitive peak reverse voltage, 13°C/W junction-to-lead thermal resistance, moisture sensitivity level 1 compliance, and suitability for automated SMT assembly in high-reliability consumer power adapters and monitors.

Technical Context

The S5KB operates as a single-die, unidirectional standard recovery rectifier with no internal anti-parallel or series configurations. Its 800V V_RRM rating enables use in 230VAC input SMPS designs where derated reverse margin is required.

Thermal performance is defined by R_θJA = 47°C/W (free-air) and R_θJL = 13°C/W, supporting sustained 5A conduction at ≤125°C junction temperature when properly mounted on copper pads. Reverse leakage remains ≤250μA at 125°C under rated VR.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), molded plastic case with matte tin-plated leads; cathode indicated by band; polarity-critical for bridge configuration placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH5L06 and MUR580, the S5KB offers optimal balance of voltage rating, thermal resistance, and SMT compatibility for cost-sensitive 50–100kHz SMPS designs where standard recovery speed is sufficient and board area is constrained.

Availability

S5KB is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and monitor power boards requiring stable component supply with full traceability and consistent DO-214AA packaging.

Supply support for S5KB 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 and protection markets since 1979.

The S5KB belongs to TSC's S5x series of standard recovery rectifiers, engineered specifically for high-volume, cost-optimized AC/DC conversion in consumer electronics where reliability, manufacturability, and regulatory compliance are mandatory.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) of the S5KB?

The S5KB has a maximum repetitive peak reverse voltage (V_RRM) of 800 V, as specified in the absolute maximum ratings table across all versions of the S5GB–S5MB family. This value is confirmed in the "ABSOLUTE MAXIMUM RATINGS" section under the column labeled "S5KB", and defines the highest reverse voltage the device can block repeatedly without breakdown under normal operating conditions.

Is the S5KB suitable for automated SMT assembly?

Yes, the S5KB is explicitly designed for automated placement, as stated in its FEATURES list. Its DO-214AA (SMB) package, matte tin-plated leads compliant with J-STD-002, and moisture sensitivity level 1 rating per J-STD-020 allow direct placement onto PCBs without baking or special handling-making it fully compatible with high-speed pick-and-place systems used in volume production.

What is the forward voltage (V_F) specification for the S5KB at rated current?

The S5KB has a maximum forward voltage (V_F) of 1.1 V at 5 A forward current and 25°C junction temperature, per the ELECTRICAL SPECIFICATIONS table. This value is measured under pulsed conditions (PW = 0.3 ms) and represents the upper limit of conduction loss under nominal load, directly impacting thermal design and efficiency in power supply applications.

Does the S5KB have halogen-free and RoHS compliance documentation?

Yes, the S5KB is both RoHS compliant and halogen-free according to IEC 61249-2-21, as confirmed in the FEATURES section of the official Taiwan Semiconductor documentation. These compliance statements apply specifically to the S5KB variant and are verified through material declarations and third-party test reports aligned with EU directives and industry green standards.

What is the junction-to-lead thermal resistance (R_θJL) of the S5KB?

The S5KB has a typical junction-to-lead thermal resistance (R_θJL) of 13 °C/W, as published in the THERMAL PERFORMANCE table. This parameter quantifies the thermal path from die to soldered lead and is critical for estimating temperature rise when the device is mounted on standard PCB copper; it enables accurate thermal modeling without requiring external heatsinks in many 5A applications.