Microchip Technology 689-1

Overview

689-1 from Microsemi is a fast recovery rectifier assembly in a center-tap positive (P) configuration, housed in an electrically isolated aluminum case. It delivers 15 A average DC output current at TC = 55 °C, supports 100 V VRWM, exhibits 500 ns reverse recovery time, and operates up to 150 °C junction temperature - used in high-reliability AC/DC front-end power supplies for industrial motor drives.

For engineers reviewing the 689-1 datasheet, 689-1 pinout, 689-1 application, or 689-1 equivalent, key selection criteria include its fast recovery performance, thermally robust aluminum package, center-tap polarity marking (+/−/AC), and compliance with JESD282-B surge and reverse voltage definitions.

Technical Context

This device integrates two fast recovery diodes in a single hermetically sealed aluminum case with electrical isolation between terminals and case. Its 500 ns trr and 100 V VRWM are specified per leg under IF = 1.0 A, IRM = 1.0 A, and IR(REC) = 0.5 A conditions, meeting JESD282-B transient definitions.

The center-tap positive (P) configuration provides a common cathode node marked "+", with two AC input terminals and a negative terminal marked "−". Thermal resistance is 6.0 °C/W junction-to-case, enabling high-power dissipation when mounted on heatsinks.

Key Specifications

Pinout & Package

Package: Aluminum case, electrically isolated, center-tap positive (P) configuration. Terminals: Tin/lead or RoHS-compliant matte tin. Marking: "+" (cathode common), "−" (anode common), and "AC" (two alternating current inputs). Weight ≈ 30 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-15EWH06-M3 and MUR1520CT, the 689-1 uniquely combines 100 V VRWM, 500 ns trr, center-tap positive polarity, and electrically isolated aluminum packaging - making it irreplaceable in space-constrained, thermally demanding, and safety-isolation-critical rectifier applications.

Availability

689-1 is available at Aetrix Electronics and suitable for industrial motor drives, medical imaging power modules, avionics converters, and test equipment AC front-ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 689-1 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

Microsemi Corporation (now part of Microchip Technology) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.

The 689(e3) series targets ruggedized power conversion where thermal stability, surge immunity, and electrical isolation are critical - especially in mission-critical rectifier assemblies for harsh-environment systems.

FAQ

What is the maximum junction temperature rating for the 689-1?

The 689-1 has a maximum junction temperature (TJ) rating of +150 °C, verified per Microsemi RF01151 Rev A specifications. This allows reliable operation in sealed enclosures or high-ambient environments when thermal resistance RθJC = 6.0 °C/W is respected. The 689-1 must be mounted to a heatsink capable of maintaining case temperature within derating limits shown in Figure 3 of the datasheet.

Does the 689-1 have electrically isolated terminals?

Yes, the 689-1 features an electrically isolated aluminum case - meaning all terminals (+, −, AC1, AC2) are insulated from the metal housing. This eliminates the need for insulating pads or shoulder washers when mounting directly to a heatsink. Isolation voltage exceeds 1000 V, supporting safety-critical and noise-sensitive applications where ground-loop prevention is essential.

What does the "P" suffix mean in the 689-1 part number?

The "P" in 689-1 denotes center-tap positive configuration: the "+" terminal is the common cathode node, while "−" is the common anode and "AC1/AC2" are the two alternating current inputs. This matches standard center-tap transformer wiring for full-wave rectification. The 689-1 is not interchangeable with "N" (center-tap negative) or "D" (doubler) variants without circuit redesign.

Is the 689-1 RoHS compliant?

Yes, the 689-1 carries the "e3" suffix indicating RoHS compliance per EU Directive 2011/65/EU. Its terminations use matte tin plating instead of tin/lead, ensuring compatibility with lead-free reflow processes. The aluminum case and internal die construction remain unchanged from non-RoHS versions - only the surface finish differs.

What is the reverse recovery time (trr) specification for the 689-1?

The 689-1 has a maximum reverse recovery time (trr) of 500 ns, measured per leg under IF = 1.0 A, IRM = 1.0 A, and IR(REC) = 0.5 A at 25 °C. This value is confirmed in the Electrical Characteristics table on page 3 of the RF01151 Rev A datasheet. The 689-1's trr enables efficient operation in 20–100 kHz switching power supplies without excessive switching loss or EMI generation.