Diodes Incorporated BAS21DW-7

Overview

BAS21DW-7 from Diodes Incorporated is a surface-mount dual high-voltage switching diode in SOT363 package, featuring 250 V repetitive peak reverse voltage (V_RRM), 1.25 V max forward voltage at 200 mA, and 50 ns reverse recovery time (t_RR). It serves as a fast-switching, low-leakage discrete rectifier pair in DC-DC converter flyback snubbers and ESD-protected signal routing paths.

For engineers reviewing the BAS21DW-7 datasheet, BAS21DW-7 pinout, BAS21DW-7 application, or BAS21DW-7 equivalent, key selection criteria include its 250 V V_RRM, dual-common-cathode configuration, 5.0 pF junction capacitance at 0 V, AEC-Q101 qualification for automotive use, and compatibility with automated SMT assembly on FR-4 boards.

Technical Context

This dual diode integrates two independent silicon PN junctions in a single SOT363 package with common cathode connection. Its 250 V V_RRM and 200 V VRWM support high-voltage transient suppression in 24 V and 48 V industrial power rails.

The 50 ns t_RR and 5.0 pF CT enable operation up to ~10 MHz in clamp and steering functions, while 100 nA IR at 200 V ensures minimal leakage in battery-backed monitoring circuits.

Key Specifications

Pinout & Package

SOT363 (SC-88) 6-pin package with dual diode array in common-cathode configuration; molded green plastic case, matte tin-plated terminals, 0.003 g mass, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage dual switching diode applications.

Compared with BAS21DWQ-13, the BAS21DW-7 offers identical performance in commercial-grade applications with smaller reel size; versus MMBD2102-7-F, it trades 4 ns speed for integrated dual topology and +50 V voltage margin-critical for 48 V industrial surge immunity.

Availability

BAS21DW-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial 48 V DC-DC converters, and USB-C ESD protection interfaces requiring stable component supply across design-in, prototyping, and volume production phases.

Supply support for BAS21DW-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, serving industrial, computing, consumer, and automotive markets since 1959.

The BAS20/BAS21 series targets high-reliability discrete switching applications, emphasizing high-voltage robustness, fast recovery, and AEC-Q101 compliance for harsh-environment signal and power conditioning.

FAQ

What is the pin configuration of BAS21DW-7 and how are Pins 3 and 4 used?

Pins 1 and 5 are anodes of the two diodes; Pins 2 and 6 are electrically connected common cathodes. Pins 3 and 4 are internally unconnected (NC) - they must remain unbonded and may be left floating or grounded per PCB layout guidelines to reduce parasitic inductance. No current flows through these terminals under normal operation.

Is BAS21DW-7 suitable for automotive applications?

Yes, the BAS21DW-7 meets commercial temperature and reliability requirements, and shares identical electrical and thermal characteristics with the AEC-Q101-qualified BAS21DWQ-13. While not itself certified, its design basis and test correlation support use in non-safety-critical automotive subsystems such as infotainment power supplies and body control modules.

How does the common-cathode configuration affect circuit implementation?

The common-cathode arrangement allows both diodes to share a single low-impedance return path to ground or reference, simplifying PCB layout and reducing ground bounce in high-speed switching. It enables parallel clamping of two independent signals or series connection for higher voltage blocking - but requires careful thermal design since both diodes dissipate heat into the same cathode pad.

What is the maximum continuous forward current per diode in BAS21DW-7?

The datasheet specifies 200 mA average rectified output current (I_O) for the dual-diode configuration. When used as two independent diodes, each can handle up to 200 mA average current if thermally managed per the recommended FR-4 pad layout; derating applies above +70°C ambient per the 200 mW power dissipation limit.