Diodes Incorporated FR804

Overview

FR804 from ON Semiconductor is a fast recovery rectifier diode in TO-220A package, rated for 400 V maximum recurrent peak reverse voltage (VRRM), 8.0 A average forward rectified current at TC = 100°C, and 150 ns maximum reverse recovery time (Trr). It delivers low forward voltage drop (1.3 V @ 8.0 A), low leakage (10 µA @ 25°C), and high surge capability (150 A, 8.3 ms half-sine), used in offline AC/DC power supplies and DC motor freewheeling circuits.

For engineers reviewing the FR804 datasheet, FR804 pinout, FR804 application, or FR804 equivalent, key selection considerations include its 400 V blocking rating, 150 ns recovery speed for reduced switching loss, TO-220A thermal performance with axial leads, and compatibility with industrial-grade 60 Hz rectification under inductive loads.

Technical Context

This device operates as a unidirectional silicon junction rectifier optimized for high-efficiency, medium-power AC-to-DC conversion. Its fast recovery behavior (Trr ≤ 150 ns) minimizes reverse conduction losses during commutation, while the 70 pF junction capacitance supports stable high-frequency operation up to several hundred kHz.

The TO-220A package provides direct case-to-heatsink thermal path with plating compliant to MIL-STD-202 Method 208. Polarity is defined by Pin 1 (+ anode) and Pin 2 (– cathode); case is electrically isolated and non-conductive per UL 94V-0 molded plastic construction.

Key Specifications

Pinout & Package

Package: TO-220A - Molded plastic case with isolated metal tab, UL 94V-0 rated, axial plated leads, 2.24 g mass, mountable in any orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH8R04DJF and MUR840, FR804 offers superior surge robustness (150 A IFSM) and electrically isolated case-ideal for cost-sensitive, thermally constrained designs where moderate recovery speed suffices and mounting simplicity is prioritized.

Availability

FR804 is available at Aetrix Electronics and suitable for AC/DC power supplies, DC motor control systems, and uninterruptible power supply (UPS) battery chargers requiring stable component supply and long-term industrial availability.

Supply support for FR804 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

ON Semiconductor is a global semiconductor supplier focused on energy-efficient electronics, delivering discrete, analog, and power management solutions for automotive, industrial, and cloud infrastructure markets.

The FR801–FR805 series belongs to ON Semiconductor's fast recovery rectifier product line, engineered for high-reliability, medium-power AC/DC conversion where thermal stability, surge resilience, and consistent reverse recovery performance are critical.

FAQ

Is FR804 suitable for use in a 100 kHz SMPS boost rectifier?

Yes. With 150 ns reverse recovery time and 70 pF junction capacitance, FR804 supports operation up to 150 kHz in discontinuous conduction mode (DCM) boost rectifiers. Its 1.3 V forward voltage and 8.0 A average current rating enable reliable performance at 100 kHz with appropriate heatsinking and layout optimization for EMI control.

Can FR804 be mounted directly to a heatsink without electrical isolation?

No. The TO-220A package features an electrically isolated plastic case-neither pin nor case is internally connected. Mounting to a heatsink does not require insulating hardware, but the case itself provides no thermal conduction path; only the lead frame and internal die attach contribute to thermal transfer via pins.

What is the maximum allowable case temperature for continuous 8.0 A operation?

The datasheet specifies 8.0 A average forward current at TC = 100°C. Operation above this temperature requires derating per Figure 1: at TC = 125°C, I(AV) drops to ~5.5 A; at TC = 150°C, it falls to ~2.8 A. Sustained 8.0 A operation must maintain case temperature ≤ 100°C using adequate heatsinking and airflow.

Does FR804 meet RoHS and REACH compliance standards?

Yes. FR804 is manufactured per ON Semiconductor's standard RoHS-compliant process (Pb-free, halogen-free) and conforms to EU REACH SVHC regulations. Full compliance documentation-including material declarations and test reports-is available through ON Semiconductor's official product page and Aetrix Electronics' quality portal upon request.