Microchip Technology 689-5

Overview

689-5 from Microsemi is a fast recovery rectifier assembly in doubler configuration, housed in an electrically isolated aluminum case, rated for 500 V VRWM, 15 A average DC output current at TC = 55 °C, and 500 ns reverse recovery time - used in high-efficiency AC/DC front-end power supplies for industrial motor drives.

For engineers reviewing the 689-5 datasheet, 689-5 pinout, 689-5 application, or 689-5 equivalent, key selection criteria include its 500 V working peak reverse voltage, 500 ns trr, 15 A thermal-current rating at 55 °C, RoHS-compliant matte tin terminals, and aluminum case for enhanced thermal dissipation and electrical isolation.

Technical Context

This device integrates two fast recovery diodes in a single aluminum-cased doubler topology, enabling full-wave rectification without external center-tapped transformers. Its controlled avalanche characteristics and 150 A non-repetitive surge rating support robust operation under transient overloads.

The 6.0 °C/W junction-to-case thermal resistance and electrically isolated case allow direct mounting to heatsinks with no insulating hardware required. It operates across -65 °C to +150 °C junction temperature range and supports soldering at 260 °C for 10 seconds.

Key Specifications

Pinout & Package

Package: Aluminum case with electrically isolated terminals; weight ≈ 30 g; RoHS-compliant matte tin plating; marking includes "AC", "+", "−", and part number. Dimensions per RF01151 Rev A: D = 56.9–57.4 mm, E = 47.5–47.75 mm, F = 37.59–37.85 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-15EWH05 and MUR1550CT, the 689-5 delivers unique integration of doubler topology, electrically isolated aluminum packaging, and 150 A surge capability - making it optimal for space-constrained, high-reliability industrial power supplies where thermal and safety isolation are design-critical.

Availability

689-5 is available at Aetrix Electronics and suitable for industrial motor drives, uninterruptible power supplies, medical imaging equipment, and test & measurement instrumentation requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for 689-5 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) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal ICs, radiation-hardened devices, and power discretes for aerospace, defense, and industrial markets.

The 681/689 series was engineered specifically for ruggedized AC/DC front-end rectification in mission-critical power systems where thermal performance, surge resilience, and electrical isolation are non-negotiable.

FAQ

What is the maximum operating junction temperature for the 689-5?

The 689-5 has a maximum junction temperature of +150 °C, verified per Microsemi RF01151 Rev A specifications. This rating enables operation in high-ambient industrial environments when paired with appropriate heatsinking. Derating curves in Figure 3 confirm usable output current down to 10.5 A at TC = 100 °C. The 689-5 must be mounted to a thermally conductive surface to maintain this limit in continuous operation.

Does the 689-5 have RoHS-compliant terminals?

Yes, the 689-5(e3) variant features RoHS-compliant matte tin plating on all terminals, as confirmed in the "PART NOMENCLATURE" section of RF01151 Rev A. The "e3" suffix explicitly denotes RoHS compliance. Non-RoHS versions (blank suffix) use tin/lead plating. Both variants share identical electrical and thermal specifications, differing only in terminal finish and regulatory compliance status.

What does the "D" in the 689-5 part number indicate?

The "D" in 689-5 denotes the terminal configuration: "D" = Doubler. Per RF01151 Rev A, this means the 689-5 contains two fast recovery diodes arranged with shared cathode (+) and shared anode (−), plus two independent AC input terminals - enabling full-wave rectification without a center-tapped transformer. It is distinct from "P" (center-tap positive) and "N" (center-tap negative) variants.

How is thermal performance specified for the 689-5?

The 689-5 specifies RθJC = 6.0 °C/W (junction-to-case) and RθJA = 20 °C/W (junction-to-ambient). These values are measured with the aluminum case directly mounted to a large heatsink. The low RθJC enables accurate thermal modeling when the case is bolted to external metal surfaces. Ambient ratings assume free-air convection; actual performance improves significantly with forced airflow or heatsink coupling - as shown in Figure 3 derating curves.

What is the reverse recovery time (trr) of the 689-5 and under what conditions is it measured?

The 689-5 has a maximum reverse recovery time (trr) of 500 ns, measured per JEDEC JESD282-B at 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 RF01151 Rev A. It reflects the time required for minority carriers to clear after forward conduction ceases - a key parameter for minimizing switching loss in high-frequency rectifier applications.