Diodes Incorporated SBR3U40P1Q-7

Overview

SBR3U40P1Q-7 from Diodes Incorporated is a 40 V, 3.0 A Super Barrier Rectifier in PowerDI®123 package, engineered for high-efficiency DC-DC converters and AC-DC rectifiers. It delivers ultra-low forward voltage (0.47 V max at 3.0 A), 75 A non-repetitive surge capability, and operates up to +150°C junction temperature in automotive-grade power supplies.

For engineers reviewing the SBR3U40P1Q-7 datasheet, SBR3U40P1Q-7 pinout, SBR3U40P1Q-7 application, or SBR3U40P1Q-7 equivalent, key selection criteria include forward voltage at rated current, reverse leakage at 125°C, surge robustness, AEC-Q101 qualification, and thermal resistance in FR-4 PCB layouts.

Technical Context

This Super Barrier Rectifier replaces conventional Schottky diodes in medium-current, high-temperature power conversion stages. Its patented interlocking clip design enables 75 A IFSM with low RθJS (5 °C/W), while its soft, fast switching minimizes EMI in synchronous rectifier and flyback topologies.

The device exhibits 400 µA IR at 40 V and 25°C, rising to 40 mA at 125°C - a critical parameter for standby loss in energy-efficient adapters. Its 0.34 V typical VF at 1.0 A and 25°C supports high-conversion efficiency in compact 5–24 V output SMPS designs.

Key Specifications

Pinout & Package

Package: PowerDI®123 - surface-mount, single-ended cathode-tab package with matte tin annealed terminals, UL 94V-0 molding compound, and moisture sensitivity level 1.

Key Features

Applications

Availability

SBR3U40P1Q-7 is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial SMPS secondary-side rectification, and USB-C PD adapter designs requiring stable component supply and long-term lifecycle assurance.

Supply support for SBR3U40P1Q-7 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 Taiwan and China.

This part belongs to Diodes' SBR (Super Barrier Rectifier) product line, developed specifically for high-efficiency, high-reliability power conversion in automotive, industrial, and computing applications where low VF and high surge tolerance are critical.

FAQ

What is the thermal resistance junction-to-solder (RθJS) for SBR3U40P1Q-7?

The RθJS is 5 °C/W, measured from die center to the cathode tab solder joint. This value assumes direct thermal connection to a 2 oz. copper PCB pad per Diodes' recommended layout. It enables efficient heat transfer in space-constrained power stages where heatsinking is impractical.

Is SBR3U40P1Q-7 pin-compatible with standard PowerDI123 Schottky diodes?

Yes - it uses identical PowerDI®123 footprint and polarity marking (cathode band). Layout compatibility is confirmed by Diodes' published pad dimensions (X=1.05 mm, Y=1.50 mm, X2=4.10 mm). No PCB redesign is needed when upgrading from legacy 40 V Schottky parts.

How does its reverse leakage compare at elevated temperature?

IR increases from 400 µA at 25°C to 40 mA at 125°C under 40 V reverse bias. This behavior is documented in DS31164 Rev. 12, Figure 3, and remains within acceptable limits for most 12–24 V systems operating below 105°C ambient.

Does SBR3U40P1Q-7 require a heatsink in 3 A continuous operation?

No external heatsink is required if mounted on a minimum 2 oz. copper pad per Diodes' layout guidelines. At 3 A and 25°C ambient, junction temperature stays below 120°C. Derating begins above 85°C ambient due to RθJA = 100 °C/W on standard FR-4.