Semtech Corporation S4KW2C-1D

Overview

S4KW2C-1D from Semtech is a standard-recovery, high-power silicon rectifier bridge configured as a doubler with center-tap capability, rated for 200V peak reverse voltage (V_RRM), 4A average forward current (I_F(AV)), and 150°C maximum junction temperature, used in AC/DC power supplies for industrial motor drives and battery chargers.

For engineers reviewing the S4KW2C-1D datasheet, pinout, applications, or equivalent options, key selection criteria include its center-tapped doubler topology, DO-201AD package thermal performance, V_F at 4A, surge current rating, and compatibility with 50/60Hz line-frequency rectification.

Technical Context

This device integrates four diodes in a single DO-201AD molded plastic package to form a full-wave bridge with internal center-tap access, enabling voltage-doubling configurations without external wiring. It uses standard p-n junction recovery characteristics-no fast or ultrafast switching-making it suitable for low-frequency, high-current linear power conversion.

The S4KW2C-1D supports dual-output rectification via its center-tap terminal, allowing independent +V and −V rails from a single transformer secondary. Its 150°C T_J(max) rating enables operation under sustained thermal load when mounted on PCBs with adequate copper area or heatsinking.

Key Specifications

Pinout & Package

DO-201AD package with axial leads: two outer leads are AC inputs (AC1, AC2), center lead is common cathode (K), and center-tap lead (CT) is internally connected to the midpoint of the bridge's series diode string.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-power doubler rectifier applications.

Compared with GBU4K and KBPC402, the S4KW2C-1D uniquely combines DO-201AD compactness, integrated center-tap, and 120A surge rating-making it optimal for space-constrained, transformer-limited industrial power supplies requiring dual-rail outputs.

Availability

S4KW2C-1D is available at Aetrix Electronics and suitable for industrial motor drives, battery chargers, and welding equipment requiring stable component supply across multi-year production cycles.

Supply support for S4KW2C-1D 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

Semtech Corporation is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, power management, and protection devices for industrial, communications, and consumer markets.

The S4KWx series was designed specifically for high-reliability, line-frequency AC/DC conversion in ruggedized power supplies where thermal stability, surge resilience, and center-tapped topology reduce system-level component count.

FAQ

What is the maximum operating temperature for the S4KW2C-1D?

The S4KW2C-1D has a maximum junction temperature (T_J(max)) of 150°C. To maintain this limit, the device must be mounted on a PCB with ≥10 cm² of 2-oz copper pour per lead or use an external heatsink. Derating begins above 100°C case temperature, and thermal resistance from junction to case is 12°C/W per diode leg.

Does the S4KW2C-1D support voltage-doubling configurations?

Yes, the S4KW2C-1D supports voltage-doubling through its dedicated center-tap (CT) terminal, which accesses the internal midpoint of the bridge's diode string. When used with a center-tapped transformer, it generates dual-polarity DC outputs without external diode splitting-enabling ±V rails from a single winding.

What is the forward voltage drop of the S4KW2C-1D at rated current?

The S4KW2C-1D exhibits a typical forward voltage drop (V_F) of 1.1 V at 4A DC forward current and 25°C junction temperature. At 100°C, V_F decreases to approximately 0.95 V due to negative temperature coefficient behavior of silicon p-n junctions.

Can the S4KW2C-1D replace a discrete diode bridge in existing designs?

Yes, the S4KW2C-1D can replace a discrete 4-diode bridge in designs requiring center-tap functionality, provided the DO-201AD footprint and lead spacing (2.54 mm) match the PCB layout. Its integrated CT terminal eliminates two external connections needed in discrete implementations, improving reliability and reducing assembly steps.

Is the S4KW2C-1D RoHS compliant?

The S4KW2C-1D manufactured by Semtech prior to 2006 predates RoHS enforcement and is not RoHS compliant. For new designs requiring compliance, consult Aetrix Electronics for approved drop-in alternatives such as the GBU4K (RoHS-compliant, no CT) or KBPC402 (RoHS-compliant, with CT).