Diodes Incorporated B140HB-13

Overview

B140HB-13 from Diodes Incorporated is a 1.0A, 40V surface-mount Schottky barrier rectifier in SMB package, featuring low forward voltage (0.49V at 1.0A/125°C), 45A non-repetitive surge rating, and guard ring die construction for transient protection-used in DC-DC converter output rectification and low-voltage power supplies.

For engineers reviewing the B140HB-13 datasheet, B140HB-13 pinout, B140HB-13 application, or B140HB-13 equivalent, key selection criteria include forward voltage at elevated temperature, leakage current at 100°C, thermal resistance (36°C/W), and SMB package compatibility with automated SMT assembly.

Technical Context

This Schottky diode employs platinum-silicide or similar low-barrier metal-semiconductor junction to achieve fast switching (no minority-carrier storage) and low VF. Its guard ring structure enhances ruggedness against voltage transients without external clamping components.

Rated for 1.0A average forward current at 115°C terminal temperature, it requires PCB copper pad heatsinking (5.0 mm², 0.013 mm thick) to maintain thermal performance; capacitance is 80 pF at 5V reverse bias, limiting high-frequency noise filtering use.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, molded plastic case with UL 94V-0 flammability rating, cathode indicated by band or notch.

Key Features

Applications

Availability

B140HB-13 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, USB power delivery interface, and automotive body control module applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for B140HB-13 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 and manufacturing operations across Asia and the US.

The B140HB belongs to Diodes' general-purpose Schottky rectifier product line, engineered for cost-sensitive, high-volume power conversion applications demanding reliability, thermal robustness, and RoHS compliance.

FAQ

What is the maximum junction temperature for continuous operation?

The B140HB-13 has an operating junction temperature range of –55°C to +150°C. For continuous 1.0A operation, the terminal temperature must be held at ≤115°C using a 5.0 mm² copper pad heatsink; exceeding this derates average current per Fig. 4 in the datasheet.

Is B140HB-13 pin-compatible with SMA-packaged Schottky diodes?

No-B140HB-13 uses the larger SMB (DO-214AA) package (4.06–4.57 mm width), while SMA (DO-214AC) measures 2.92–3.28 mm width. Pad layout, thermal mass, and surge capability differ; direct substitution requires PCB redesign and thermal validation.

Does this diode require a heatsink for 1.0A operation?

Yes-datasheet Fig. 4 specifies 1.0A average current only when terminal temperature (TT) is maintained at ≤115°C. This requires mounting on a 5.0 mm² (0.013 mm thick) copper pad as defined in Note 4; no external heatsink is needed if PCB copper meets this spec.

How does its leakage compare to silicon rectifiers at 100°C?

At 40V reverse bias and 100°C, B140HB-13 exhibits 4.0 mA leakage-orders of magnitude higher than silicon PN rectifiers (<10 µA), but typical for Schottky devices. This necessitates careful standby power budgeting in battery-powered systems.