Diodes Incorporated SDM05U40CSP-7

Overview

SDM05U40CSP from Diodes Incorporated is a 40 V, 0.5 A Schottky barrier rectifier in a chip-scale package (X3-WLB1006-2), featuring 0.36 V typical forward voltage at 0.5 A, 75 µA max reverse leakage at 40 V, and 0.275 mm profile. It serves as a low-loss, space-constrained blocking or reverse protection diode in portable power rails.

For engineers reviewing the SDM05U40CSP datasheet, SDM05U40CSP pinout, SDM05U40CSP application, or SDM05U40CSP equivalent, key selection criteria include thermal resistance (RθJA = 80 °C/W on 1-in² copper), junction capacitance (35 pF at 4 V), and ultra-thin 0.275 mm height for high-density PCB layouts.

Technical Context

This Schottky rectifier uses a planar metal–semiconductor junction to achieve low VF and fast switching with no minority-carrier storage delay. Its NiAu bump terminals enable reliable solder attachment on fine-pitch pads, and the X3-WLB1006-2 package delivers RθJC = 3 °C/W to support thermal management in compact DC/DC converters.

The device operates across –55 °C to +150 °C with derated VR down to 20 V at +125 °C ambient. Reverse leakage remains ≤15 µA at 10 V and 125 °C, supporting stable performance in thermally stressed battery-input stages.

Key Specifications

Pinout & Package

Package: X3-WLB1006-2 - Chip-scale package with NiAu bumps, cathode marked by dot, polarity defined by bump layout per Diodes' marking diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RB050M-30 and NSR0530HT1G, SDM05U40CSP uniquely combines sub-0.3 mm height, 0.6 mm² footprint, and 0.5 A rating-enabling integration into next-gen hearables and ingestible sensors where vertical clearance and area are simultaneously constrained.

Availability

SDM05U40CSP is available at Aetrix Electronics and suitable for USB-C power delivery interfaces, wearable battery management systems, and IoT edge node DC/DC converters requiring stable component supply and long-term manufacturability.

Supply support for SDM05U40CSP 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 SDM05U40CSP belongs to Diodes' CSP Schottky rectifier product line, engineered specifically for space- and thermal-constrained portable electronics where traditional SMD diodes cannot meet mechanical or efficiency targets.

FAQ

What is the maximum allowable junction temperature for SDM05U40CSP?

The SDM05U40CSP has an absolute maximum junction temperature of +150 °C, with continuous operation rated from –55 °C to +150 °C. Derating begins at +125 °C ambient, where VR drops to 20 V per Figure 4. Thermal design must ensure TJ stays below 150 °C under worst-case power dissipation (0.18 W at 0.5 A × 0.36 V).

Is SDM05U40CSP qualified for automotive applications?

SDM05U40CSP is not AEC-Q101 qualified. Diodes offers automotive-grade variants (e.g., SDM05U40Q) with PPAP documentation and IATF 16949 manufacturing, but this part is intended for commercial portable and industrial applications only.

How does the X3-WLB1006-2 package differ from standard DFN1006?

X3-WLB1006-2 is a wafer-level chip-scale package with NiAu bumps, measuring 0.6 mm² and 0.275 mm height-over 30% thinner than DFN1006 (1.0 mm × 0.6 mm, 0.5 mm height). It eliminates leadframe and molding compound, enabling direct die-to-PCB thermal and electrical paths.

Can SDM05U40CSP be used in synchronous rectification circuits?

No-SDM05U40CSP is a passive Schottky rectifier, not a MOSFET-based synchronous rectifier. It lacks gate control and cannot replace active switch controllers. It functions only as a unidirectional, self-commutated rectifying element in flyback, boost, or reverse-protection topologies.