Diodes Incorporated SDT8A120P5Q-7D

Overview

SDT8A120P5Q-7D from Diodes Incorporated is a 120 V, 8 A Trench Schottky barrier rectifier in PowerDI5 package, featuring 0.84 V max forward voltage at 8 A/25°C, 300 μA max reverse leakage at 120 V/25°C, and AEC-Q101 qualification for automotive power conversion systems including DC-DC converters and AC-DC adapters.

For engineers reviewing the SDT8A120P5Q-7D datasheet, SDT8A120P5Q-7D pinout, SDT8A120P5Q-7D application, or SDT8A120P5Q-7D equivalent, this part delivers thermally robust rectification with soft switching, +150°C junction rating, and RoHS-compliant green packaging - critical for high-efficiency, high-reliability automotive power supplies.

Technical Context

This Schottky rectifier uses trench MOS structure to achieve low VF and stable IR across temperature, enabling efficient unidirectional conduction in high-frequency switching topologies. Its 150 A non-repetitive surge rating supports transient load handling in buck and flyback converters.

The PowerDI5 package provides 18 °C/W junction-to-heat-sink thermal resistance (with 50 mm × 50 mm × 23 mm Al heatsink), and its 0.093 g mass supports compact board layouts while maintaining thermal stability up to TJ = +150°C.

Key Specifications

Pinout & Package

Package: PowerDI5 - surface-mount, thermally enhanced plastic package with exposed copper pad for improved heat transfer; dimensions 3.966 mm × 6.504 mm × 0.85 mm; weight 0.093 g; UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-8EWH12FN-M3/45 and SB8M120, SDT8A120P5Q-7D offers superior thermal resistance (18 °C/W with heatsink), tighter VF distribution, and AEC-Q101 certification - making it optimal for space-constrained, high-reliability automotive power stages.

Availability

SDT8A120P5Q-7D is available at Aetrix Electronics and suitable for automotive DC-DC converters, AC-DC adapters, and industrial motor drives requiring stable component supply, AEC-Q101 compliance, and long-term lifecycle support.

Supply support for SDT8A120P5Q-7D 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, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The SDT8A120P5Q-7D belongs to Diodes' AEC-Q101-qualified PowerDI5 Schottky rectifier family, engineered specifically for high-efficiency, high-temperature automotive power conversion where low VF and thermal robustness are critical.

FAQ

What is the maximum junction temperature and how does it affect layout?

The SDT8A120P5Q-7D has a rated TJ range of –55°C to +150°C. To sustain 8 A continuously, the exposed pad must be soldered to ≥1000 mm² copper area with ≥2 thermal vias to internal ground planes. With a 50 mm × 50 mm aluminum heatsink, RθJA drops to 18 °C/W - enabling full-rated current at +85°C ambient.

Is SDT8A120P5Q-7D pin-compatible with other PowerDI5 Schottky rectifiers?

Yes - all PowerDI5-packaged Schottky rectifiers from Diodes Incorporated share identical mechanical footprint, pad layout, and terminal assignments (Anode, Cathode, Exposed Pad). This allows direct substitution within the same voltage/current class without PCB redesign, provided thermal and electrical margins remain acceptable.

How does its soft switching behavior improve EMI performance?

As a Schottky device, SDT8A120P5Q-7D exhibits no reverse recovery charge (Qrr ≈ 0), eliminating high-frequency ringing and voltage overshoot during turn-off. This reduces conducted and radiated EMI by up to 10 dB in 30–100 MHz bands - simplifying filter design and easing CISPR-25 Class 5 compliance in automotive systems.

Does it require derating at elevated ambient temperatures?

Yes - Figure 4 in DS39558 shows linear derating from 8 A at +25°C to ~4.5 A at +100°C on standard FR-4 (RθJA = 88 °C/W). With heatsink mounting, derating begins above +125°C ambient. Always use TJ = TA + (PD × RθJA) to verify junction temperature stays below 150°C under worst-case load and airflow conditions.