Taiwan Semiconductor Corporation S2B

Overview

S2B from Taiwan Semiconductor is a standard surface-mount silicon rectifier diode with 100 V repetitive peak reverse voltage (V_RRM), 2 A average forward current (I_F), and 50 A surge capability (I_FSM), housed in a DO-214AA (SMB) package. It delivers low forward voltage drop (≤1.15 V at 2 A, 25°C), high junction temperature rating (150°C), and is optimized for switching-mode power supplies and AC/DC adapters.

For engineers reviewing the S2B datasheet, S2B pinout, S2B application, or S2B equivalent, key selection criteria include its 100 V V_RRM, 2 A continuous conduction rating, DO-214AA mechanical compatibility, moisture sensitivity level 1 compliance, and verified thermal resistance (R_θJL = 16°C/W).

Technical Context

The S2B is a single-die, glass-passivated PN junction rectifier designed for general-purpose AC-to-DC conversion. Its electrical behavior is defined by a maximum forward voltage of 1.15 V at 2 A and 25°C, reverse leakage of ≤1 µA at 25°C and rated V_R, and a reverse recovery time of 1500 ns under specified test conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A).

Thermally, it features a junction-to-lead resistance of 16°C/W and junction-to-ambient resistance of 53°C/W, enabling reliable operation up to 150°C junction temperature. The device uses matte tin-plated leads compliant with J-STD-002 and meets JESD201 Class 2 whisker resistance requirements.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, single-anode/single-cathode configuration. Cathode identified by molded band. Matte tin-plated leads, UL 94V-0 molding compound, weight ≈ 0.090 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR210 and VS-2EYH01-M3, the S2B provides the optimal balance of low forward voltage (≤1.15 V), industry-standard recovery speed (1500 ns), and moisture-level-1 manufacturability-making it ideal for cost-sensitive, thermally constrained, and high-volume adapter designs where ultrafast recovery is unnecessary.

Availability

S2B is available at Aetrix Electronics and suitable for switching-mode power supplies, AC/DC adapters, and LED lighting applications requiring stable component supply, consistent DO-214AA packaging, and RoHS-compliant sourcing.

Supply support for S2B 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.

The S2B belongs to TSC's S2x family of standard surface-mount rectifiers, engineered for high-volume, cost-optimized AC/DC conversion in consumer and industrial power supplies where reliability, manufacturability, and thermal performance are prioritized over ultrafast switching.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S2B?

The S2B has a V_RRM of 100 V, as confirmed in the Absolute Maximum Ratings table across all versions of the N2102 datasheet. This value is specific to the S2B marking code and distinguishes it from other variants like S2A (50 V) or S2D (200 V). Operating above 100 V reverse bias risks irreversible breakdown. The S2B must be selected only in circuits where peak reverse voltage remains within this limit.

Does the S2B support automated SMT assembly without special handling?

Yes, the S2B is rated moisture sensitivity level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into reflow without baking. Its matte tin-plated leads comply with J-STD-002 for solderability, and the DO-214AA (SMB) package is optimized for pick-and-place accuracy-making the S2B fully compatible with high-speed automated SMT lines.

What is the forward voltage (V_F) specification for the S2B under typical operating conditions?

The S2B has a maximum forward voltage of 1.15 V at 2 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 worst-case conduction loss. At elevated temperatures or lower currents, V_F decreases slightly, but system thermal design should be based on the 1.15 V max to ensure margin.

Can the S2B replace the S2A or S2D in an existing design?

No-the S2B (100 V V_RRM) is not a drop-in replacement for S2A (50 V) or S2D (200 V), as reverse voltage ratings are non-interchangeable. Substituting without circuit review risks overvoltage failure (if replacing S2A) or unnecessary cost/derating (if replacing S2D). The S2B must be used only where 100 V blocking is explicitly required and validated in the target application.

What thermal performance metrics are specified for the S2B?

The S2B specifies R_θJL = 16°C/W (junction-to-lead) and R_θJA = 53°C/W (junction-to-ambient), both measured under standard JEDEC test conditions. These values enable accurate thermal modeling: for example, at 2 A and 1.15 V drop (2.3 W dissipation), junction temperature rise above lead temperature is ~37°C, confirming suitability for PCBs with moderate copper area.