Diodes Incorporated SDT12A120P5-13D

Overview

SDT12A120P5 from Diodes Incorporated is a 12A, 120V Trench Schottky Barrier Rectifier in PowerDI5 package, featuring VF ≤ 0.80 V at 12 A and 25°C, IR ≤ 500 µA at 120 V and 25°C, and +150°C maximum junction temperature - deployed as freewheel or output rectifier in high-efficiency DC/DC converters.

For engineers reviewing the SDT12A120P5 datasheet, SDT12A120P5 pinout, SDT12A120P5 application, or SDT12A120P5 equivalent, key selection criteria include forward voltage drop at full load, high-temperature leakage stability, thermal resistance under PCB layout constraints, and compatibility with compact power-stage layouts requiring low-profile surface-mount diodes.

Technical Context

This Schottky rectifier uses trench MOS structure to reduce series resistance and achieve low VF while maintaining soft reverse recovery - critical for minimizing switching losses in synchronous and non-synchronous buck topologies. Its 12 A average forward current rating is derated linearly above +25°C ambient, reaching ~7.5 A at +100°C per Figure 4.

The device exhibits <35 µA IR at 120 V and +125°C (per datasheet Table), enabling stable blocking performance in high-temperature AC/DC adapter secondary-side rectification. Thermal resistance junction-to-ambient is 18°C/W on 50 mm × 50 mm Al heatsink (Note 7), versus 88°C/W on standard FR-4 (Note 6).

Key Specifications

Pinout & Package

Package: PowerDI5 - thermally optimized 3-pin surface-mount package with exposed cathode pad, 3.966 mm × 6.51 mm footprint, 1.10 mm height, UL 94V-0 molding compound, and 0.093 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-12BQ015-M3/45 and SB12E120, SDT12A120P5 delivers optimal balance of 120 V blocking, 0.80 V VF ceiling, and 18°C/W heatsink-enabled thermal resistance - making it uniquely suited for high-density, high-temperature 48–60 V DC/DC outputs where both voltage margin and thermal headroom are constrained.

Availability

SDT12A120P5 is available at Aetrix Electronics and suitable for DC/DC converters, AC/DC adapters, and industrial 48 V power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for SDT12A120P5 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 SDT12A120P5 belongs to Diodes' PowerDI® Schottky rectifier product line, engineered specifically for high-efficiency, high-power-density AC/DC and DC/DC conversion in space-constrained consumer and industrial power supplies.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The SDT12A120P5 is rated for continuous operation up to +150°C junction temperature, verified per datasheet Absolute Maximum Ratings table. This allows full 12 A current capability at ambient temperatures up to +105°C when mounted on an aluminum heatsink per Note 7, and enables use in sealed or high-temperature industrial enclosures without forced air cooling.

Is the PowerDI5 package lead-free and RoHS compliant?

Yes - the SDT12A120P5 features a lead-free finish and complies with EU RoHS Directive 2015/863/EU (RoHS 3). It is also halogen- and antimony-free ("Green" per Diodes' definition), containing <900 ppm bromine, <900 ppm chlorine, and <1000 ppm antimony compounds, as confirmed in Notes 1–3 of the datasheet.

How does the thermal resistance change between PCB-only and heatsink mounting?

RθJA is 88°C/W on standard FR-4 (2 oz. copper, minimum pad), but drops to 18°C/W when mounted on a 50 mm × 50 mm × 23 mm aluminum heatsink (Note 7). This five-fold improvement enables 5 W power dissipation at only 90°C temperature rise - critical for achieving high power density in compact adapters without thermal throttling.

Can SDT12A120P5 be used as a direct replacement for silicon PN rectifiers in existing designs?

Yes - its 120 V VRRM and 12 A IF(AV) match common 1N54xx and MURxx series silicon rectifiers, but with significantly lower VF (0.80 V vs. ≥1.1 V) and zero reverse recovery. However, layout must accommodate the PowerDI5 footprint and exposed cathode pad; no changes to gate drive or timing are needed since it's a passive rectifier.