Diodes Incorporated B345BE-13

Overview

B345BE-13 from Diodes Incorporated is a 45 V, 3.0 A surface-mount Schottky barrier rectifier in SMB package, featuring 0.5 V max forward voltage at 3 A and 0.30 mA max reverse leakage at 45 V/25°C, optimized for high-efficiency DC-DC boost stages in industrial power supplies.

For engineers reviewing the B345BE-13 datasheet, B345BE-13 pinout, B345BE-13 application, or B345BE-13 equivalent, key selection criteria include its low VF stability up to +125°C, thermal resistance (RθJA = 90°C/W), SMB footprint compatibility, and RoHS-compliant matte tin terminations.

Technical Context

This Schottky rectifier employs a planar epitaxial construction with low-barrier metal-semiconductor junction to achieve minimal conduction loss and suppressed reverse recovery charge. Its design targets continuous forward conduction in switching power topologies where fast turn-off and low stored charge are critical.

Thermal performance is defined by a 90°C/W junction-to-ambient resistance on standard FR-4 PCBs (0.4" × 0.5", 2 oz Cu), enabling reliable operation up to +150°C junction temperature under derated current conditions.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount plastic case with cathode band marking; dimensions: 3.30–3.94 mm (L) × 4.06–4.57 mm (W) × 1.96–2.21 mm (H); weight ≈ 0.093 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS34 and SB340, B345BE-13 provides unique 45 V blocking headroom while maintaining identical 3 A rating and SMB footprint-critical for industrial 24 V systems subject to 40–45 V transients and long-term reliability at elevated ambient temperatures.

Availability

B345BE-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom DC-DC converters requiring stable component supply with consistent SMB footprint and thermal performance.

Supply support for B345BE-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, manufacturing, and sales operations across Asia, Europe, and North America.

The B3xxBE/B3xxCE series belongs to Diodes' general-purpose Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability rectification in space-constrained power conversion stages operating up to +150°C.

FAQ

What is the maximum junction temperature for B345BE-13?

The absolute maximum junction temperature is +150°C, as specified in the Thermal Characteristics table. Operation at this limit requires strict adherence to derating curves-Figure 4 shows DC forward current must be reduced to ~1.8 A at +125°C ambient on standard FR-4 PCBs to maintain safe TJ.

Is B345BE-13 suitable for use in automotive applications?

Yes, B345BE-13 meets AEC-Q101 stress test requirements per Diodes Incorporated's qualification report for the B3xxBE family. Its -55°C to +150°C operating range, low high-temperature leakage, and robust SMB package support under-hood and body electronics applications including LED drivers and power distribution units.

How does the SMB package compare thermally to SMC for this device?

The SMB variant has RθJA = 90°C/W versus 70°C/W for SMC on identical PCBs. This means SMB requires ~20% more copper area or thermal vias to achieve the same junction temperature rise. However, SMB saves board space-its footprint is 3.6 × 4.3 mm vs. SMC's 5.9 × 6.9 mm-making it preferred for compact designs where airflow or heatsinking is limited.

Can B345BE-13 replace B340BE-13 in an existing design?

Yes, B345BE-13 is a direct upgrade: both share identical SMB package, 3 A rating, and 0.5 V VF spec, but B345BE-13 offers 5 V higher VRRM (45 V vs. 40 V). No layout change is needed, and the higher blocking margin improves surge immunity-especially valuable in 24 V systems exposed to load-dump transients.