Diodes Incorporated SDM40E20LAQ-7

Overview

SDM40E20LAQ-7 from Diodes Incorporated is a dual-channel surface-mount Schottky barrier diode rated for 20 V reverse voltage, 0.4 A continuous forward current, and 0.43 V max forward voltage at 0.5 A, optimized for DC-DC converter output rectification and reverse polarity protection in automotive electronics.

For engineers reviewing the SDM40E20LAQ-7 datasheet, SDM40E20LAQ-7 pinout, SDM40E20LAQ-7 application, or SDM40E20LAQ-7 equivalent, key selection criteria include its AEC-Q101 qualification, SOT23 package thermal resistance (444 °C/W), 250 µA max leakage at 20 V, guard ring construction for transient immunity, and low-conductance design enabling high-efficiency 12 V–5 V/3.3 V point-of-load conversion.

Technical Context

This dual Schottky diode integrates two independent anode-cathode junctions in a single SOT23-3 package with common cathode configuration confirmed by top-view marking and mechanical drawings. Each element exhibits 120 pF typical capacitance at 0 V bias and maintains ≤0.43 V VF up to 0.5 A, supporting high-frequency switching (>1 MHz) in synchronous buck converters.

Its guard ring structure provides inherent transient voltage suppression without external TVS components, while AEC-Q101 qualification ensures operation across –65 °C to +125 °C ambient with 2 A non-repetitive surge rating - critical for automotive load-dump and cold-crank environments.

Key Specifications

Pinout & Package

Package: SOT23-3, surface-mount plastic case (UL 94V-0), 0.008 g weight, matte tin-plated alloy 42 leadframe, moisture sensitivity level 1.

Key Features

Applications

Availability

SDM40E20LAQ-7 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera power supplies, and telematics control units requiring stable component supply with AEC-Q101 compliance and PPAP support.

Supply support for SDM40E20LAQ-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 SDM40E20LAQ-7 belongs to Diodes' automotive-qualified Schottky diode product line, engineered specifically for high-reliability 12 V vehicle subsystems where low VF, transient resilience, and thermal stability are mandatory.

FAQ

What is the pin configuration of SDM40E20LAQ-7?

SDM40E20LAQ-7 uses a SOT23-3 package with Pin 1 = Anode 1, Pin 2 = Common Cathode, Pin 3 = Anode 2. This common-cathode dual configuration is confirmed in the DS39302 Rev. 4-2 datasheet Figure "Top View" and mechanical drawing section.

Is SDM40E20LAQ-7 suitable for reverse polarity protection in 12 V automotive systems?

Yes - its 20 V VR rating exceeds nominal 12 V system voltage and accommodates ISO 7637-2 load dump pulses up to 27 V. With 250 µA IR at 20 V and AEC-Q101 qualification, it delivers reliable, low-leakage protection in battery-connected circuits.

How does SDM40E20LAQ-7 differ from SDM40E20LSQ-7-F?

Both share identical electrical specs and SOT23-3 packaging. SDM40E20LAQ-7 is automotive-grade with AEC-Q101 qualification and PPAP capability; SDM40E20LSQ-7-F is also automotive but carries the "-F" suffix denoting Diodes' internal tape-and-reel packaging variant - functionally interchangeable in design.

What thermal derating applies to SDM40E20LAQ-7 at elevated ambient temperatures?

Per Figure 4 in DS39302, average forward current must be linearly derated from 0.4 A at 25 °C to 0 A at 125 °C ambient. On FR-5 PCB, this corresponds to a 0.3 A limit at 75 °C and 0.2 A at 100 °C due to its 444 °C/W RθJA.