Diodes Incorporated SDM1M40LP8-7

Overview

SDM1M40LP8-7 from Diodes Incorporated is a 40 V, 1 A surface-mount Schottky rectifier in U-DFN1608-2 package, featuring 0.66 V max forward voltage at 1 A/25°C, 0.02 mA max reverse leakage at 40 V/25°C, and 8.4 ns typical reverse recovery time - optimized for DC-DC converter output rectification and freewheeling in compact power supplies.

For engineers reviewing the SDM1M40LP8-7 datasheet, SDM1M40LP8-7 pinout, SDM1M40LP8-7 application, or SDM1M40LP8-7 equivalent, key selection criteria include low VF stability across temperature, ultra-low IR at 125°C, JEDEC-qualified reliability, and U-DFN1608-2 thermal performance in space-constrained 1A power rails.

Technical Context

This Schottky diode employs a planar silicon epitaxial structure with NiPdAu-plated copper leadframe to achieve low conduction loss and thermally stable reverse leakage. Its 0.42 V typical VF at 0.5 A/125°C enables high-efficiency operation in thermally demanding environments.

The device is rated for 8 A non-repetitive surge current and exhibits 25 pF junction capacitance at 5 V/1 MHz, supporting fast switching in synchronous buck and flyback secondary-side rectification where low trr and minimal capacitive loading are critical.

Key Specifications

Pinout & Package

Package: U-DFN1608-2 (1.6 mm × 0.8 mm × 0.5 mm), 2-terminal surface-mount package with exposed cathode-side marking dot and NiPdAu-plated terminals.

Key Features

Applications

Availability

SDM1M40LP8-7 is available at Aetrix Electronics and suitable for DC-DC converters, AC-DC adapters, and automotive body control modules requiring stable component supply, JEDEC-qualified reliability, and green-compliant packaging.

Supply support for SDM1M40LP8-7 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, specializing in high-efficiency power management and signal integrity solutions for industrial, computing, and automotive markets.

The SDM1M40LP8-7 belongs to Diodes' high-reliability Schottky rectifier product line, engineered specifically for space-constrained, thermally aggressive 1A power conversion applications where low VF and stable IR are critical.

FAQ

What is the maximum junction temperature for continuous operation?

The SDM1M40LP8-7 supports continuous operation up to +150°C junction temperature, verified per JEDEC standards. At 1A DC current and 25°C ambient, thermal modeling using its 130 °C/W RθJA shows TJ ≈ 155°C - thus derating to 0.95A is recommended for sustained 25°C ambient use to remain within limit.

Is this part suitable for automotive applications?

The SDM1M40LP8-7 is not AEC-Q200 qualified; it is JEDEC-qualified for high reliability but lacks PPAP documentation and IATF 16949 manufacturing certification. For automotive use, Diodes recommends the Q-suffix variant (e.g., SDM1M40LP8Q-7), listed in their automotive product portal.

How does the U-DFN1608-2 package affect thermal performance?

The U-DFN1608-2 package uses an exposed copper leadframe cathode as the primary thermal path. With 1-inch² 2oz copper pad, RθJA is 130 °C/W; doubling pad area to 2-inch² reduces it to ~95 °C/W, enabling 1.2A continuous current in controlled layouts.

Can SDM1M40LP8-7 replace a standard 1N5819 in existing designs?

Yes - as a direct footprint-compatible upgrade: both are 2-pin SMD Schottkys, but SDM1M40LP8-7 offers 0.66 V VF (vs. 0.475 V typ for 1N5819 at 1A) and far lower IR (0.02 mA vs. 1 mA). It improves thermal stability but requires layout verification due to U-DFN's smaller size and different thermal coupling.