Taiwan Semiconductor Corporation S5JB

Overview

S5JB from Taiwan Semiconductor is a 5A, 600V standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring glass-passivated junction, low forward voltage drop (≤1.1 V at 5A), and high surge capability (200 A, 8.3 ms). It serves as primary AC/DC input rectification in compact power adapters and SMPS.

For engineers reviewing the S5JB datasheet, S5JB pinout, S5JB application, or S5JB equivalent, key selection criteria include repetitive peak reverse voltage (600 V), thermal resistance (R_θJA = 47 °C/W), junction capacitance (40 pF), and moisture sensitivity level (MSL 1).

Technical Context

The S5JB operates as a single-die, unidirectional standard recovery rectifier with no internal anti-parallel or series configuration. Its 600 V V_RRM rating targets mid-voltage AC input stages where 400 V (S5GB) is insufficient and 800 V (S5KB) is over-specified.

Thermal performance is defined by R_θJL = 13 °C/W to lead and R_θJA = 47 °C/W in free air, enabling 5 A continuous conduction up to T_J = 150 °C when mounted on ≥1 cm² copper area. Reverse leakage remains ≤10 μA at 25 °C and ≤250 μA at 125 °C under rated VR.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, single-anode/single-cathode configuration. Cathode indicated by molded band. Matte tin-plated leads, J-STD-002 solderable, MSL Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH5L06 and ES5J, the S5JB delivers best-in-class balance of low V_F, proven surge robustness, and cost-effective manufacturability-making it ideal for high-volume, thermally constrained AC/DC front-ends where ultra-fast recovery is unnecessary.

Availability

S5JB is available at Aetrix Electronics and suitable for power adapters, monitor power supplies, and industrial control modules requiring stable component supply, consistent parametric performance across production lots, and long-term lifecycle support.

Supply support for S5JB 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 Taiwanese manufacturer specializing in discrete power semiconductors, including rectifiers, TVS diodes, and MOSFETs, with ISO/TS 16949 and IATF 16949 certification.

The S5JB belongs to TSC's S5x series of standard recovery rectifiers designed specifically for cost-sensitive, high-efficiency AC/DC conversion in consumer and industrial power supplies-not optimized for high-frequency switching but engineered for reliability, surge resilience, and ease of SMT integration.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S5JB?

The S5JB has a V_RRM of 600 V, confirmed in the Absolute Maximum Ratings table across all versions (D2102). This value defines the highest instantaneous reverse voltage the diode can block repeatedly without breakdown. It is critical for selecting appropriate safety margins in 230 VAC or universal-input designs where peak line voltage reaches ~373 V, requiring ≥60 % derating for reliability.

Does the S5JB have a specified forward voltage (V_F) at 5 A?

Yes, the S5JB specifies V_F ≤ 1.1 V at I_F = 5 A and T_J = 25 °C, per Electrical Specifications table. This is a maximum limit under pulsed test conditions (PW = 0.3 ms). At continuous DC operation and elevated junction temperatures, V_F may rise to ~1.15 V, directly impacting conduction loss and thermal design of the S5JB in final application.

Is the S5JB suitable for use in high-humidity environments?

Yes, the S5JB is qualified to MSL Level 1 per J-STD-020 and uses glass-passivated chip junction technology, which provides inherent protection against moisture-induced corrosion and leakage current drift. Its molding compound meets UL 94V-0, and terminals pass JESD201 Class 2 whisker testing-making the S5JB suitable for humid coastal or industrial environments without additional conformal coating.

What is the thermal resistance from junction to ambient (R_θJA) for the S5JB?

The S5JB has an R_θJA of 47 °C/W in free-air conditions, as stated in the Thermal Performance section. This value assumes standard JEDEC test board (1s1p) and applies only when the device is mounted on minimal copper. For 5 A continuous operation, a minimum 1.5 cm² 2-oz copper pad is recommended to maintain T_J ≤ 125 °C at 70 °C ambient-verified using the S5JB derating curve (Fig.1).

Can the S5JB replace the S5GB or S5KB in an existing design?

No-the S5JB is not a direct replacement for S5GB (400 V) or S5KB (800 V) due to differing V_RRM ratings. Substituting S5JB for S5GB risks overvoltage failure in 230 VAC applications; substituting for S5KB may reduce transient immunity in 380 VAC industrial systems. Always validate voltage stress margins and surge capability before interchanging any S5x-series part.