Diodes Incorporated BAS40W-05-7

Overview

BAS40W-05-7 from Diodes Incorporated is a surface-mount Schottky barrier diode in SOT323 package, rated for 40 V peak repetitive reverse voltage, 200 mA forward current, and 5.0 ns reverse recovery time. It delivers low forward voltage drop (380 mV at 1.0 mA), ultra-fast switching, and integrated PN junction guard ring for ESD/transient protection - deployed in high-frequency DC-DC converter output rectification and portable device power management.

For engineers reviewing the BAS40W-05-7 datasheet, BAS40W-05-7 pinout, BAS40W-05-7 application, or BAS40W-05-7 equivalent, key selection criteria include its 40 V VRRM rating, 380–1000 mV VF range across 1–40 mA, 5.0 ns trr, 5.0 pF CT at 0 V, and SOT323 thermal resistance of 625 °C/W - critical for compact, thermally constrained power rail designs.

Technical Context

This Schottky diode uses a platinum-silicide (PtSi) or similar low-barrier metal-semiconductor junction to achieve fast carrier injection and minimal minority-carrier storage, enabling sub-5 ns reverse recovery. Its guard ring structure isolates the active junction from surface contamination and edge breakdown, enhancing reliability under transient stress.

The SOT323 package provides low thermal resistance (625 °C/W) and minimal parasitic capacitance (5.0 pF), supporting operation up to ~500 MHz in RF detector and clamp applications. Device operation is specified from –55 °C to +125 °C, with moisture sensitivity level 1 per J-STD-020.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small plastic surface-mount package (2.0 × 2.225 mm footprint, 0.9 mm height), lead-free, RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSR0230HT1G and RB520S-30T1G, BAS40W-05-7 offers superior 40 V reverse blocking and integrated guard ring for ESD resilience - making it the preferred choice for industrial I/O protection and mixed-rail power conversion where reliability outweighs minimal VF advantage.

Availability

BAS40W-05-7 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, RF signal detection, ESD protection clamping, and high-speed logic level shifting requiring stable component supply and consistent parametric performance across production lots.

Supply support for BAS40W-05-7 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, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The BAS40W series belongs to Diodes' high-speed Schottky diode product line, engineered specifically for low-loss, high-frequency power conversion and signal conditioning in space-constrained consumer, computing, and industrial applications.

FAQ

What is the maximum junction temperature for BAS40W-05-7 during continuous operation?

The device has an operating junction temperature range of –55 °C to +125 °C. Under 200 mW power dissipation on FR4 with recommended pad layout, junction temperature rise is limited to 125 °C ambient + (200 mW × 625 °C/W) = 125 °C + 125 °C = 250 °C - but derating per Fig. 4 restricts usable power to 120 mW at 125 °C ambient to maintain TJ ≤ 125 °C.

Does BAS40W-05-7 have a built-in ESD protection structure?

Yes - it integrates a PN junction guard ring surrounding the active Schottky anode region. This structure prevents edge breakdown during electrostatic discharge events and improves transient immunity, supporting compliance with IEC 61000-4-2 Level 4 (±8 kV contact discharge) when properly laid out on PCB.

Can BAS40W-05-7 be used in place of a standard silicon diode in a 12 V automotive circuit?

No - its 40 V VRRM rating provides only 3.3× margin above 12 V nominal, insufficient for automotive load-dump transients (up to 40 V sustained, 60 V peaks). For such applications, Diodes' automotive-qualified BAS40WQ variant or higher-VRRM Schottkys like SB340 are required.

Is the SOT323 package of BAS40W-05-7 compatible with reflow soldering per J-STD-020?

Yes - the device is rated for moisture sensitivity level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30 °C/60% RH and subjected to standard Pb-free reflow profiles (peak 260 °C, 10 s max above 217 °C) without baking or special handling.