Taiwan Semiconductor Corporation S5MB

Overview

S5MB from Taiwan Semiconductor is a 5A, 1000V standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring glass-passivated junction, low forward voltage drop (≤1.1 V at 5 A), high surge capability (200 A @ 8.3 ms), and operation up to +150°C junction temperature - used in primary-side rectification of AC/DC power supplies.

For engineers reviewing the S5MB datasheet, S5MB pinout, S5MB application, or S5MB equivalent, key selection criteria include peak reverse voltage rating (1000 V), thermal resistance (R_θJA = 47 °C/W), moisture sensitivity level (MSL 1), RoHS/halogen-free compliance, and compatibility with automated SMT placement on SMB footprint.

Technical Context

The S5MB is a single-die, unidirectional standard recovery rectifier optimized for switching-mode power supply (SMPS) front-end rectification. Its 1000 V V_RRM, 200 A non-repetitive surge rating, and 1.1 V max forward voltage at 5 A support robust operation under transient overloads and continuous conduction mode.

Thermally, it delivers R_θJL = 13 °C/W to lead and R_θJA = 47 °C/W in free-air conditions. Reverse leakage remains ≤10 μA at 25°C and ≤250 μA at 125°C under rated VR, ensuring stable blocking performance across industrial temperature ranges.

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, UL 94V-0 molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH5L06 and ES5JB, the S5MB uniquely satisfies 1000 V line-rated applications while maintaining MSL 1 handling, SMB footprint compatibility, and 200 A surge capability - making it the preferred choice for global-input, high-reliability AC/DC front ends.

Availability

S5MB is available at Aetrix Electronics and suitable for switching-mode power supplies, AC/DC adapters, and TV/monitor power systems requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for S5MB 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 rectifiers, TVS diodes, MOSFETs, and power ICs since 1979.

The S5MB belongs to TSC's S5x series of standard surface-mount rectifiers designed specifically for cost-sensitive, high-volume AC/DC power conversion in consumer and industrial equipment - balancing ruggedness, thermal performance, and SMT manufacturability.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S5MB?

The S5MB has a V_RRM rating of 1000 V, verified per Taiwan Semiconductor's D2102 datasheet. This value defines the highest sinusoidal reverse voltage the S5MB can block repeatedly without breakdown. It is critical for ensuring safe operation in universal-input (90–264 VAC) power supplies where peak line voltage reaches ~375 V, plus safety margins and transients per IEC 61000-4-5. The S5MB must not be substituted with lower-V_RRM variants like S5KB (800 V) in such applications.

Does the S5MB require pre-baking before reflow soldering?

No, the S5MB does not require pre-baking prior to reflow. It is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and is safe for standard Pb-free reflow profiles without moisture-related popcorning risk. This eliminates baking steps in SMT lines, reducing process complexity and cost. The S5MB's matte tin-plated leads also comply with J-STD-002 for reliable solder wetting, further supporting high-yield assembly of the S5MB in automated production.

What is the forward voltage (V_F) of the S5MB at rated current?

The S5MB exhibits a maximum forward voltage of 1.1 V at 5 A and 25°C junction temperature, as specified in the electrical characteristics table. This parameter is measured under pulsed conditions (PW = 0.3 ms) to avoid self-heating. At elevated temperatures (e.g., 125°C), V_F decreases slightly due to semiconductor physics, but conduction losses remain predictable. Designers use this V_F value to calculate rectifier-stage power dissipation (P_cond = I_F × V_F) and verify thermal compliance for the S5MB in final layout.

Can the S5MB replace the S5GB or S5KB in an existing design?

The S5MB is not a direct drop-in replacement for S5GB (400 V) or S5KB (800 V) unless the circuit's reverse voltage stress is confirmed to remain within the S5MB's 1000 V rating and thermal design accommodates identical V_F and R_θJA. While all share the DO-214AA (SMB) package and pinout, substituting a higher-V_RRM part may increase V_F slightly and alter surge energy absorption behavior. Always validate the S5MB in-system under worst-case line and load conditions before qualifying it as a replacement for S5GB or S5KB.

Is the S5MB compliant with environmental regulations?

Yes, the S5MB is RoHS compliant and halogen-free per IEC 61249-2-21, as documented in Taiwan Semiconductor's official datasheet (Version D2102). It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE), and bromine/chlorine content is below threshold limits. These certifications apply to the completed S5MB device, including molding compound and terminations, enabling compliance with EU WEEE, China RoHS, and other global environmental directives for the S5MB.