Diodes Incorporated SDM2U20SD3-7

Overview

SDM2U20SD3-7 from Diodes Incorporated is a 2A, 20V Schottky barrier rectifier in SOD323 package, featuring 0.525 V max forward voltage at 2 A, 200 µA max reverse leakage at 20 V, and 54 pF junction capacitance at 5 V - optimized for low-loss DC-DC conversion and polarity protection circuits.

For engineers reviewing the SDM2U20SD3-7 datasheet, SDM2U20SD3-7 pinout, SDM2U20SD3-7 application, or SDM2U20SD3-7 equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance (R_θJA = 270 °C/W on 1-inch² Cu pad), reverse leakage stability across temperature, and SOD323 footprint compatibility with high-density PCB layouts.

Technical Context

This Schottky rectifier uses a planar epitaxial construction to achieve low VF and fast switching with no minority-carrier storage delay. Its 20 V V_RRM rating targets low-voltage rail rectification where reverse recovery time is irrelevant but conduction loss dominates efficiency.

The device operates from –55 °C to +150 °C and exhibits graded reverse leakage behavior: 10 µA at 10 V/25 °C rising to 200 µA at 20 V/25 °C, with thermal runaway mitigation enabled by its 70 °C/W R_θJC and low junction-to-case thermal path.

Key Specifications

Pinout & Package

Package: SOD323 - surface-mount plastic package (1.30 × 1.70 × 0.30 mm), cathode-banded, matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RB520S-30T1G and NSR20F20NXT5G, SDM2U20SD3-7 delivers optimal balance of 20 V rating, 0.525 V V_F, and minimal SOD323 footprint - making it preferred for space-constrained, thermally managed 5 V–12 V power rails where exact voltage margin and loss budget are tightly specified.

Availability

SDM2U20SD3-7 is available at Aetrix Electronics and suitable for battery-powered DC-DC converters, inverse polarity protection circuits, and low-voltage AC/DC adapters requiring stable component supply and consistent SOD323 packaging.

Supply support for SDM2U20SD3-7 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, manufacturing, and sales operations across Asia, Europe, and North America.

The SDM2U20SD3 belongs to Diodes' Schottky Rectifier product line, engineered specifically for high-efficiency, low-voltage power conversion in portable, automotive, and industrial applications where compact size and thermal performance are critical.

FAQ

What is the maximum junction temperature and how is it limited in practice?

The SDM2U20SD3-7 has an operating junction temperature range of –55 °C to +150 °C. In practice, junction temperature is limited by ambient temperature, PCB copper area, and power dissipation. With R_θJA = 270 °C/W on a 1-inch² Cu pad, dissipating 1.2 W raises T_J to 125 °C at 25 °C ambient - staying within safe operating limits. Derating is required above 25 °C ambient per Figure 4.

Is this diode suitable for automotive applications?

The SDM2U20SD3-7 is not AEC-Q200 qualified out-of-box. Diodes Incorporated states that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing - customers must contact Diodes or their local representative to request AEC-compliant variants. Standard SDM2U20SD3-7 is intended for commercial/industrial use.

How does the SOD323 package affect soldering and thermal performance?

The SOD323 package uses a matte tin-finished Alloy 42 leadframe and is rated for moisture sensitivity level 1, allowing unlimited floor life before reflow. Its small size (1.30 × 1.70 mm) demands precise stencil design and placement accuracy. Thermal performance depends heavily on PCB pad layout: R_θJA drops from 410 °C/W (minimum pad) to 270 °C/W (1-inch² Cu), so thermal vias and copper pours are essential for sustained 2 A operation.

Can SDM2U20SD3-7 replace a standard PN junction rectifier in existing designs?

Yes - as a direct drop-in replacement in SOD323 footprints, provided reverse voltage requirements stay ≤20 V. Its Schottky architecture eliminates reverse recovery loss and reduces forward drop by ~0.2–0.3 V versus comparable PN diodes, improving efficiency and reducing heat. However, reverse leakage is higher than PN types, so verify standby current budgets in battery-critical applications.