Diodes Incorporated B170B-13

Overview

B170B-13 from Diodes Incorporated is a 1.0A, 70V high-voltage Schottky barrier rectifier in SMB package with guard-ring die construction for transient protection, 0.79V forward voltage at 1.0A/25°C, 30A non-repetitive surge rating, and 80pF junction capacitance - used in low-voltage DC/DC converter freewheeling paths.

For engineers reviewing the B170B-13 datasheet, B170B-13 pinout, B170B-13 application, or B170B-13 equivalent, key selection criteria include forward voltage drop at operating current, thermal resistance (25K/W), peak reverse voltage margin, surge capability under inductive switching, and SMB package compatibility with automated SMT assembly.

Technical Context

This Schottky rectifier uses a planar guard-ring die structure to suppress edge breakdown and improve transient robustness without compromising low VF performance. Its low 0.79V VF at 1.0A enables high-efficiency operation in 3.3V–12V output buck converters and synchronous rectifier auxiliary paths.

The device exhibits 80pF junction capacitance at 4V reverse bias and 1MHz, supporting high-frequency switching up to 500kHz with minimal capacitive loss. Thermal resistance of 25K/W (junction-to-terminal) allows 1.0A continuous conduction at terminal temperatures ≤125°C under proper PCB copper area.

Key Specifications

Pinout & Package

SMB (DO-214AA) surface-mount plastic package with cathode band marking; terminals are solder-plated and compliant with MIL-STD-202 Method 208; weight 0.093g; UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS17-E3/5AT and SB170, B170B-13 delivers superior surge resilience and certified flame retardancy without sacrificing VF or footprint - making it optimal for industrial and medical power interfaces where reliability and compliance are non-negotiable.

Availability

B170B-13 is available at Aetrix Electronics and suitable for industrial motor drives, USB-C power delivery systems, and LED lighting controllers requiring stable component supply with consistent SMB packaging and UL-certified materials.

Supply support for B170B-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 centers across Asia and manufacturing in China, Taiwan, and the Philippines.

The B170/B series belongs to Diodes' high-reliability Schottky rectifier product line, engineered specifically for high-efficiency, high-surge industrial and automotive power conversion where low VF, robust transient response, and safety certification are mandatory.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The B170B-13 has an operating junction temperature range of –65°C to +150°C. For continuous 1.0A DC operation, the terminal temperature must be maintained at or below 125°C per the derating curve in Figure 1. Exceeding this requires either reduced current or active cooling, as sustained operation above 150°C risks irreversible parametric shift and bond wire failure.

Can B170B-13 replace a standard PN rectifier in a 24V AC/DC adapter?

Yes - its 70V VRRM exceeds the 34V peak of 24V RMS AC input, and 0.79V VF reduces conduction loss versus a typical 1N4007 (1.1V). However, ensure layout accommodates higher dV/dt noise due to lack of reverse recovery time; add RC snubber if EMI exceeds CISPR-32 limits in final enclosure testing.

Is the cathode band polarity marking consistent across all SMB-packaged units?

Yes - all B170B-13 units use a single black cathode band aligned with Pin 2 (cathode terminal) per DO-214AA standard. The band is laser-marked and verified during final test; no notch-based polarity marking is used in the "B" suffix variant, eliminating ambiguity during automated optical inspection.

Does the 25K/W thermal resistance assume soldered mounting to a specific copper area?

No - RJT = 25K/W is measured with terminals held at ambient temperature per Note 1 in the datasheet, independent of PCB copper area. It reflects intrinsic die-to-lead thermal path. Effective junction-to-ambient resistance depends on board layout: 1-in² 2-oz copper reduces θJA to ~50K/W, enabling full 1.0A rating at 50°C ambient.