Taiwan Semiconductor Corporation RS2B

Overview

RS2B from Taiwan Semiconductor is a 2 A, 100 V fast recovery surface-mount rectifier in DO-214AA (SMB) package, featuring 250 ns reverse recovery time, 1.3 V max forward voltage at 2 A, and 5 µA max reverse leakage at 25°C. It serves as a primary output rectifier in AC/DC adapters and offline SMPS.

For engineers reviewing the RS2B datasheet, RS2B pinout, RS2B application, or RS2B equivalent, key selection criteria include repetitive peak reverse voltage (100 V), thermal resistance (R_θJA = 55 °C/W), junction temperature range (–55 to +175 °C), and compliance with J-STD-020 moisture sensitivity level 1.

Technical Context

The RS2B operates as a single-die, unidirectional silicon rectifier optimized for high-frequency switching applications. Its glass-passivated junction ensures stable performance under thermal cycling, while the DO-214AA (SMB) package supports automated placement and meets UL 94V-0 flammability requirements.

Electrical behavior is defined by a 100 V V_RRM, 50 A non-repetitive surge rating (8.3 ms half-sine), and 50 pF junction capacitance at 1 MHz and 4 V reverse bias - parameters critical for minimizing switching losses and EMI in compact power converters.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, cathode-indicated by molded band, matte tin-plated leads compliant with J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R01 and ES2B, the RS2B offers optimal balance of cost, thermal performance (R_θJA = 55 °C/W), and standard fast recovery timing for mainstream 60–150 kHz SMPS - without requiring layout changes or premium pricing.

Availability

RS2B is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, and industrial SMPS requiring stable component supply, J-STD-020 Level 1 handling, and RoHS-compliant sourcing.

Supply support for RS2B 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 RS2B belongs to TSC's RS2x fast recovery rectifier family, engineered specifically for cost-sensitive, high-volume AC/DC power conversion where reliability, manufacturability, and thermal performance are balanced against switching speed.

FAQ

What is the maximum junction temperature rating for RS2B?

The RS2B has a maximum junction temperature (T_J) of +175 °C, enabling operation in high-ambient environments such as enclosed power supplies or industrial control cabinets. This rating is validated per JEDEC test conditions and must be maintained using appropriate thermal design - including PCB copper area and airflow - to prevent exceeding the limit during continuous 2 A conduction. The RS2B datasheet specifies derating curves starting at 75 °C case temperature.

Is RS2B compatible with lead-free reflow soldering processes?

Yes, RS2B is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its DO-214AA (SMB) package is rated for peak reflow temperatures up to 260 °C per J-STD-020. The device carries J-STD-020 Level 1 moisture sensitivity, meaning it can be placed directly into reflow without pre-baking - a key advantage for high-throughput SMT lines handling the RS2B.

How does RS2B differ from RS2A in terms of electrical specifications?

The RS2B differs from RS2A primarily in its repetitive peak reverse voltage (V_RRM): RS2B is rated at 100 V versus RS2A's 50 V. All other absolute maximum ratings - including I_F = 2 A, I_FSM = 50 A, and T_J = –55 to +175 °C - are identical. Electrical specs like V_F (≤1.3 V), I_R (≤5 µA), and t_rr (250 ns) are also shared across both RS2A and RS2B within the same RS2x family.

What is the reverse recovery time (t_rr) of RS2B and how is it measured?

The RS2B has a reverse recovery time (t_rr) of 250 ns, measured under standardized conditions: I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A, and T_J = 25 °C. This value is specified in the official Taiwan Semiconductor datasheet (Version L2304) and reflects the time required for minority carriers to clear after forward conduction ceases - a critical parameter for minimizing switching loss and voltage overshoot in the RS2B's target applications.

Does RS2B have a cathode marking, and how is polarity identified on the device?

Yes, RS2B uses a molded cathode band on the DO-214AA (SMB) package body to indicate polarity - consistent with industry-standard diode marking. The band aligns with the cathode terminal, which is the lead closest to the band. This marking is clearly shown in the package outline drawing (HQ2SD07-DO214SMB-035 REV A) and verified on physical units. Correct orientation is essential: reverse connection will block conduction and may cause system failure in the RS2B's intended rectifier role.