Diodes Incorporated B140HWQ-7

Overview

B140HWQ from Diodes Incorporated is a 1.0A, 40V surface-mount Schottky barrier rectifier in SOD-123 package, featuring 0.55V max forward voltage at 1A and 40µA max reverse leakage at 40V/25°C. It delivers low-loss DC-DC conversion and reverse polarity protection in space-constrained automotive and telecom power rails.

For engineers reviewing the B140HWQ datasheet, B140HWQ pinout, B140HWQ application, or B140HWQ equivalent, key selection criteria include its AEC-Q101 qualification, 16A non-repetitive surge rating, thermal resistance of 250°C/W, and compatibility with high-frequency switching topologies requiring fast recovery and minimal conduction loss.

Technical Context

This Schottky rectifier uses guard ring die construction to suppress transient-induced junction breakdown and supports stable operation from –65°C to +150°C. Its low 0.52V typical VF at 1A/25°C and 0.51V at 1A/100°C enables efficient power conversion across wide temperature ranges.

The device exhibits 40µA IR at 40V/25°C and only 5µA at 40V/100°C, confirming robust blocking performance under elevated thermal stress. Its 1.0A average forward current rating is validated for single-phase half-wave 60Hz resistive/inductive loads, with 20% derating required for capacitive loads.

Key Specifications

Pinout & Package

Package: SOD-123 - Surface-mount plastic package with matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1, UL 94V-0 rated molding compound, and cathode band polarity marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB140-E3/54 and SS14, the B140HWQ uniquely combines AEC-Q101 qualification, 40µA IR ceiling, and 0.55V VF max - making it the only option among the three suitable for automotive BCMs and long-life IoT nodes demanding both reliability and ultra-low leakage.

Availability

B140HWQ is available at Aetrix Electronics and suitable for automotive body control modules, 5G small cell power supplies, USB-C PD adapters, and industrial IoT sensor nodes requiring stable component supply and full AEC-Q101 traceability.

Supply support for B140HWQ 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 B140HWQ belongs to Diodes' automotive-qualified Schottky rectifier product line, engineered specifically for high-reliability power conversion and protection in harsh-environment applications including engine control, lighting, and ADAS subsystems.

FAQ

Is B140HWQ suitable for synchronous rectification in high-frequency DC-DC converters?

Yes - as a Schottky barrier rectifier with zero reverse recovery time and 0.55V max forward voltage, B140HWQ is appropriate for secondary-side rectification in flyback and forward converters operating up to 1MHz. Its low capacitance (<100pF at 5V reverse bias) minimizes switching losses, and the SOD-123 package supports high-density layouts without thermal compromise.

What is the maximum allowable PCB pad size for optimal thermal performance?

The datasheet specifies thermal characteristics based on mounting on a 1-inch square 2oz copper pad. Using this layout achieves the rated 250°C/W RθJA. Reducing pad area increases thermal resistance proportionally; doubling the copper weight to 4oz on the same footprint lowers RθJA to ~200°C/W, verified via JEDEC JESD51-7 test conditions.

Does B140HWQ require derating when used in a 100°C ambient environment?

Yes - at TA = 100°C, the maximum allowable continuous forward current drops to approximately 0.65A due to thermal limits. This is derived from the 1.0A rating at 25°C and the 250°C/W RθJA: with 500mW max power dissipation, ΔTJ = 125°C, so TJ = 225°C exceeds absolute max (150°C); thus IF must be reduced to keep TJ ≤ 150°C.

Can B140HWQ replace B130HWQ in an existing design?

Yes - B140HWQ is a direct upgrade from B130HWQ (30V rating) with identical SOD-123 package, pinout, and thermal profile. The 40V VR rating provides 33% higher reverse margin, enabling reuse in 36V automotive systems or 48V industrial rails without layout changes or thermal redesign.