Diodes Incorporated B170BQ-13-F

Overview

B170BQ-13-F from Diodes Incorporated is a 70 V, 1.0 A surface-mount Schottky barrier rectifier in SMB package, featuring 0.79 V max forward voltage at 1.0 A and 0.5 mA max reverse leakage at rated VR, optimized for polarity protection and DC-DC freewheeling in automotive power rails.

For engineers reviewing the B170BQ-13-F datasheet, B170BQ-13-F pinout, B170BQ-13-F application, or B170BQ-13-F equivalent, key selection criteria include reverse voltage margin, thermal resistance (25 °C/W), AEC-Q101 qualification, RoHS/Green compliance, and SMB footprint compatibility with automated assembly.

Technical Context

This Schottky rectifier uses guard ring die construction to suppress transient-induced failure and supports high-temperature soldering (260 °C/10 s). Its low VF and fast switching enable high-efficiency operation in low-voltage, high-frequency power conversion stages.

Rated for -65 °C to +150 °C junction temperature, it delivers 30 A non-repetitive surge current (8.3 ms half-sine) and exhibits 80 pF total capacitance at 4 V reverse bias - critical for EMI-sensitive DC-DC feedback paths and recirculating inductive loads.

Key Specifications

Pinout & Package

SMB (DO-214AA) surface-mount plastic package with cathode band marking; 0.093 g mass; UL 94V-0 flammability rating; moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB170-E3/5AT and SS17, B170BQ-13-F delivers lower forward voltage, superior thermal resistance, and full AEC-Q101 qualification - making it the preferred choice for automotive and thermally demanding industrial rectification where efficiency and compliance are mandatory.

Availability

B170BQ-13-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC-DC converters, smart meter auxiliary supplies, and LED driver polarity protection requiring stable component supply and long-term lifecycle assurance.

Supply support for B170BQ-13-F 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, specializing in high-reliability power management and signal integrity solutions.

The B170BQ-13-F belongs to Diodes' AEC-Q101-qualified Schottky rectifier product line, designed specifically for automotive and industrial power conversion where low VF, robust surge capability, and process-controlled Green manufacturing are essential.

FAQ

Is B170BQ-13-F suitable for 48 V automotive systems?

No - its 70 V VRRM provides only ~46 % margin above 48 V nominal, insufficient for ISO 7637-2 pulse testing. For 48 V systems, B1100BQ-13-F (100 V VRRM) or higher-rated alternatives are recommended to ensure reliable transient blocking.

What is the maximum allowable PCB copper area for thermal relief with B170BQ-13-F?

With RθJT = 25 °C/W, adding 100 mm² of 2 oz copper directly under the SMB pad reduces effective thermal resistance by ~12 °C/W. Full derating curves in DS38540 show 1.0 A IO is sustainable at 125 °C terminal temperature with ≥200 mm² of thermal pad area.

Does B170BQ-13-F require a heatsink in standard SMT layouts?

No - its SMB package and 25 °C/W RθJT allow direct PCB copper to serve as sufficient heatsink at ≤1.0 A continuous current and ambient ≤85 °C. Heatsinking is only needed for sustained >0.8 A loads in enclosed, high-ambient environments.

Can B170BQ-13-F replace B170A in legacy designs?

No - B170A uses SMA package (smaller footprint, higher RθJT ≈ 40 °C/W) and lacks AEC-Q101 qualification. While electrically similar, B170BQ-13-F's SMB case requires PCB land pattern revision and offers improved thermal performance and automotive compliance.