Taiwan Semiconductor Corporation S1B

Overview

S1B from Taiwan Semiconductor is a 1 A, 100 V surface-mount silicon rectifier diode in DO-214AC (SMA) package, featuring glass-passivated junction, low forward voltage drop (≤1.1 V at 1 A), and 40 A non-repetitive surge current capability; used in DC-DC converters and snubber circuits.

For engineers reviewing the S1B datasheet, S1B pinout, S1B application, or S1B equivalent, key selection criteria include repetitive peak reverse voltage (100 V), thermal resistance (27 °C/W junction-to-lead), reverse leakage (≤1 µA at 25 °C), and RoHS/halogen-free compliance for industrial power conversion designs.

Technical Context

The S1B is a single-die, standard recovery rectifier with 1500 ns reverse recovery time under IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A conditions, and exhibits 12 pF junction capacitance at 1 MHz and 4.0 V reverse bias. Its thermal design supports continuous operation up to TJ = 175 °C.

It operates with polarity indicated by cathode band, uses matte tin-plated leads compliant with J-STD-002, and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements in its DO-214AC molding compound.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration; cathode identified by molded band; weight ≈ 0.060 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR110 and VS-1EWH01-M3/5AT, the S1B offers optimal balance of cost, thermal robustness (27 °C/W RθJL), and sufficient speed for sub-100 kHz power stages-making it ideal for cost-sensitive industrial and lighting applications where ultrafast recovery is unnecessary.

Availability

S1B is available at Aetrix Electronics and suitable for DC-DC converters, snubber circuits, and lighting applications requiring stable component supply, consistent DO-214AC packaging, and RoHS-compliant manufacturing.

Supply support for S1B 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 industrial, computing, and consumer markets since 1979.

The S1B belongs to TSC's S1x series of general-purpose surface-mount rectifiers, engineered for reliable, cost-effective AC/DC and DC/DC power conversion in non-ultrafast switching applications.

FAQ

What is the maximum repetitive peak reverse voltage (VRRM) rating for the S1B?

The S1B has a VRRM rating of 100 V, meaning it can reliably block up to 100 V of reverse voltage in repetitive operation without breakdown. This value is confirmed in the Absolute Maximum Ratings table of the S2102 datasheet revision and applies specifically to the S1B variant-not the entire S1x family. Designers must ensure circuit peak reverse voltage stays below this limit with appropriate safety margin. The S1B datasheet specifies this parameter under TA = 25°C with no derating applied.

Does the S1B have a specified reverse recovery time (trr), and how is it measured?

Yes, the S1B has a reverse recovery time (trr) of 1500 ns, measured under the conditions IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A, as stated in the Electrical Specifications table. This is a standard recovery characteristic-not ultrafast-and reflects behavior in typical 50–100 kHz switching applications. The test circuit diagram is provided in Figure 6 of the S2102 datasheet. Designers should account for this trr when evaluating EMI or switching losses in hard-switched topologies.

Is the S1B RoHS compliant and halogen-free, and what standards does it meet?

Yes, the S1B is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the S2102 datasheet. Its molding compound meets UL 94V-0 flammability rating, and terminals are matte tin plated per J-STD-002. These certifications apply directly to the S1B part number and are verified in the official Taiwan Semiconductor documentation-not inferred from family-level claims.

What is the thermal resistance from junction to lead (RθJL) for the S1B, and why does it matter?

The S1B has a junction-to-lead thermal resistance (RθJL) of 27 °C/W, per the Thermal Performance table in the S2102 datasheet. This low value indicates efficient heat transfer from the die to the PCB pads through the leads, enabling higher power dissipation without external heatsinking. It matters because it directly impacts steady-state junction temperature-critical for reliability in enclosed or high-ambient-temperature applications like LED drivers or industrial controls.

Can the S1B be used as a direct replacement for the S1A or S1D in an existing design?

No-the S1B is not a direct replacement for S1A (50 V) or S1D (200 V) due to differing VRRM ratings. While all share the same DO-214AC package and pinout, substituting S1B for S1A risks overvoltage failure in 50 V–rated circuits, and using it in place of S1D may cause premature breakdown in 200 V applications. Always match the exact voltage grade; the S1B datasheet confirms its 100 V rating applies only to that specific marking code.