Infineon Technologies IDP18E120XKSA1

Overview

IDP18E120 from Infineon Technologies is a fast-switching, soft-recovery 1200 V, 18 A ultrafast rectifier diode in TO-220-2 package, featuring 1.65 V forward voltage at 18 A/25°C, 195 ns reverse recovery time at 25°C, and 1.1 K/W junction-to-case thermal resistance - deployed in high-frequency PFC stages of industrial SMPS and solar inverters.

For engineers reviewing the IDP18E120 datasheet, IDP18E120 pinout, IDP18E120 application, or IDP18E120 equivalent, key selection criteria include reverse recovery charge (1880 nC @ 25°C), softness factor (S = 5.5), thermal derating curve (IF = 19.8 A @ TC = 90°C), and RoHS/halogen-free compliance for power-conversion reliability.

Technical Context

This diode employs optimized lifetime control and epitaxial structure to achieve low Qrr and soft reverse recovery, minimizing EMI and snubber losses in hard-switched topologies. Its 1200 V VRRM rating supports 800 V DC-link operation with margin, while the 78 A IFSM enables robust surge handling during startup or fault conditions.

The device operates up to 150 °C junction temperature and exhibits predictable VF drift (1.7 V @ 150°C, 18 A) and trr increase (300 ns @ 150°C), enabling accurate thermal modeling in convection-cooled TO-220 mounts with 6 cm² copper area.

Key Specifications

Pinout & Package

Package: PG-TO220-2 (standard TO-220 variant with 2 leads: Cathode and Anode; no gate or sense pins). Mounting via isolated tab (cathode-connected) with M3 screw hole.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast 1200 V rectifier applications.

Compared with STTH1612D and MUR1820CT, IDP18E120 delivers superior conduction efficiency and lower switching loss due to its 1.65 V VF and 1880 nC Qrr, making it optimal for thermally constrained, high-frequency PFC stages where both losses must be minimized simultaneously.

Availability

IDP18E120 is available at Aetrix Electronics and suitable for industrial SMPS, solar inverters, and EV onboard chargers requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.

Supply support for IDP18E120 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power, sensor, and automotive ICs, with global R&D and manufacturing infrastructure.

IDP18E120 belongs to Infineon's "E-Series" ultrafast diode product line, engineered specifically for high-efficiency, high-frequency AC-DC and DC-DC conversion in industrial and renewable energy systems.

FAQ

What is the maximum continuous forward current at 90°C case temperature?

IDP18E120 supports 19.8 A continuous forward current at TC = 90°C, as specified in the Absolute Maximum Ratings table. This derating reflects thermal limits imposed by the 1.1 K/W RthJC and 150°C Tjmax, and is validated under natural convection with 6 cm² copper area on FR4 PCB.

Is IDP18E120 pin-compatible with standard TO-220-2 diodes?

Yes - IDP18E120 uses the industry-standard PG-TO220-2 footprint with cathode-connected tab (Pin 1) and anode lead (Pin 2). Mechanical dimensions, mounting hole location, and lead pitch match JEDEC TO-220AB, enabling drop-in replacement in existing layouts.

Does this diode require a thermal pad or insulator when mounted to a heatsink?

Yes - the metal tab is electrically connected to the cathode. When mounting to a grounded or common-potential heatsink, a ceramic or silicone thermal pad with ≥2.5 kV dielectric strength is required to prevent short-circuit and ensure isolation per IEC 62109.

How does reverse recovery softness factor (S = 5.5) impact circuit design?

A softness factor of 5.5 indicates controlled, non-abrupt current decay during turn-off, reducing voltage overshoot and oscillatory ringing. This allows smaller snubber capacitors, lower EMI filter attenuation, and improved reliability in high-dV/dt environments like motor drives and inverters.