Diodes Incorporated B0540WS-7

Overview

B0540WS from Diodes Incorporated is a surface-mount Schottky barrier rectifier in SOD323 package, rated for 40 V peak repetitive reverse voltage and 0.5 A average rectified output current, with typical forward voltage of 285 mV at 10 mA and 300 mV at 500 mA, used in low-voltage DC-DC converter output rectification and USB power path protection.

For engineers reviewing the B0540WS datasheet, B0540WS pinout, B0540WS application, or B0540WS equivalent, this part supports compact, high-efficiency power conversion in space-constrained portable electronics where low forward drop and fast switching are critical.

Technical Context

This Schottky diode employs guard ring construction to enhance transient voltage immunity and suppress leakage under reverse bias. Its low R_θJA (270 °C/W on 1-inch² copper pad) enables thermal stability in unheatsinked PCB layouts.

The device exhibits 125 pF total capacitance at 0 V reverse bias and 20 pF at 10 V, supporting high-frequency switching up to several MHz without excessive capacitive loading. Reverse leakage remains ≤1.0 μA at 10 V and ≤2.0 μA at 30 V, ensuring minimal standby power loss.

Key Specifications

Pinout & Package

Package: SOD323 - surface-mount plastic case with cathode band marking; dimensions: 1.30 mm (D) × 1.70 mm (E) × 0.30 mm (L); weight ≈ 0.004 g; moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RB520S-30T2R and NSR0530HT1G, B0540WS uniquely balances 40 V reverse margin, 0.5 A current handling, and SOD323 compactness-making it optimal for USB PD 3.0 and dual-rail industrial controllers where voltage headroom and size are both constrained.

Availability

B0540WS is available at Aetrix Electronics and suitable for USB power delivery modules, portable medical monitors, and automotive infotainment systems requiring stable component supply across multi-year production cycles.

Supply support for B0540WS 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, with design centers across Asia and Europe.

The B0540WS belongs to Diodes' high-reliability Schottky rectifier product line, engineered for low-loss power conversion in space- and efficiency-critical applications including portable electronics and automotive subsystems.

FAQ

What is the maximum junction temperature for continuous operation of B0540WS?

The B0540WS has an operating junction temperature range of –40 °C to +150 °C. Under 0.5 A DC load with 270 °C/W thermal resistance on a 1-inch² copper pad, junction temperature rise is ~135 °C above ambient, limiting safe continuous use to ≤15 °C ambient unless additional cooling is applied.

Does B0540WS support automotive qualification?

The B0540WS is qualified to JEDEC standards referenced in AEC-Q200 for high-reliability applications. An automotive-compliant variant, B0540WSQ, is separately qualified and documented-B0540WS itself is not AEC-Q200 certified but shares identical die and process.

Can B0540WS replace a standard silicon diode in a 5 V supply?

Yes-its 300 mV forward voltage at 500 mA reduces conduction loss by ~65% versus a typical 800 mV silicon diode, lowering self-heating and improving efficiency. However, its 40 V V_RRM must be verified against system transient voltages, as Schottky devices exhibit higher reverse leakage than silicon.

Is the SOD323 package compatible with standard reflow profiles?

Yes-the SOD323 package is rated for moisture sensitivity level 1 per J-STD-020 and supports standard Pb-free reflow profiles (peak 260 °C, 10–30 sec above 217 °C). Matte tin-plated leads ensure reliable solder wetting per MIL-STD-202, Method 208.