Diodes Incorporated SDM10P45-7

Overview

SDM10P45-7 from Diodes Incorporated is a surface-mount Schottky barrier diode in SOT-523 package, rated for 45 V peak repetitive reverse voltage, 100 mA forward continuous current, and 370–470 mV forward voltage at 10–50 mA. It features ultra-small footprint, low VF, fast switching, and PN junction guard ring for ESD/transient protection-used in space-constrained DC-DC converter output rectification and USB port protection circuits.

For engineers reviewing the SDM10P45-7 datasheet, SDM10P45-7 pinout, SDM10P45-7 application, or SDM10P45-7 equivalent, key selection criteria include its 45 V VRRM rating, 120 mW power dissipation limit, 6.0 pF junction capacitance at 10 V, thermal resistance of 833 °C/W, and guaranteed operation from –40 °C to +125 °C ambient.

Technical Context

This Schottky diode employs a planar silicon structure with integrated guard ring to suppress edge breakdown and improve transient robustness. Its low forward voltage drop stems from optimized metal–semiconductor contact and shallow junction depth, enabling high efficiency in low-voltage, high-frequency rectification.

The device operates without minority-carrier storage delay, delivering sub-nanosecond reverse recovery time-critical for synchronous buck converter freewheeling paths and 5 V/3.3 V rail clamping where minimal switching loss and ringing suppression are required.

Key Specifications

Pinout & Package

SOT-523 is a 3-pin ultra-small plastic surface-mount package (1.60 × 0.80 × 0.50 mm) with gull-wing leads, UL 94V-0 rated mold compound, and moisture sensitivity level 1. Polarity is marked with "LG" on cathode end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RB520S-30T2R and NSR02030HT1G, SDM10P45-7 uniquely supports 45 V blocking in SOT-523 while maintaining sub-0.5 µA leakage and 6 pF capacitance-making it optimal for 36 V industrial sensors and 40 V PoE-powered devices where space and voltage margin are constrained.

Availability

SDM10P45-7 is available at Aetrix Electronics and suitable for USB interface protection, low-power DC-DC output rectification, and RTC backup power path designs requiring stable component supply across multi-year production cycles.

Supply support for SDM10P45-7 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 China, Taiwan, and the US.

The SDMxxPxx series targets ultra-compact, high-efficiency Schottky rectification in portable and space-limited applications, emphasizing low VF, robust ESD immunity, and tight parametric consistency across temperature.

FAQ

Is SDM10P45-7 suitable for reverse polarity protection in 5 V systems?

Yes. With 45 V VRRM and 370 mV VF at 10 mA, it provides low-loss forward conduction while blocking reverse voltages up to 45 V. Its 0.07 µA IR at 5 V ensures negligible quiescent current draw, making it ideal for always-on 5 V IoT sensor nodes where battery drain must be minimized.

What is the maximum allowable PCB temperature rise during continuous 100 mA operation?

At 100 mA and 370 mV VF, power dissipation is 37 mW. With RθJA = 833 °C/W, junction-to-ambient rise is ~31 °C. Assuming 25 °C ambient, junction temperature reaches ~56 °C-well within the –40 °C to +125 °C rating. No heatsinking is required on standard FR-4 with recommended pad layout.

Does SDM10P45-7 have a specified reverse recovery time (trr)?

No trr is specified because Schottky diodes are majority-carrier devices with no minority-carrier storage delay. The datasheet confirms fast switching via low CT (6.0 pF) and absence of reverse recovery charge (Qrr = 0). This eliminates switching tail current and associated losses in high-frequency (>1 MHz) converters.

Can SDM10P45-7 replace a 1N5819 in an existing design?

Only in low-current, low-voltage applications (<30 V, <50 mA). While both are Schottky diodes, SDM10P45-7 has lower IF rating (100 mA vs. 1 A), smaller package (SOT-523 vs. DO-41), and tighter VRRM (45 V vs. 40 V). It cannot handle the surge or thermal load of 1N5819; direct replacement requires full revalidation of current, thermal, and layout margins.