Microchip Technology 689-3N

Overview

689-3N from Microsemi is a fast recovery rectifier assembly in center-tap negative configuration, rated for 300 V VRWM, 15 A average DC output current at TC = 55 °C, 500 ns reverse recovery time, and housed in an electrically isolated aluminum case with tin/lead or RoHS-compliant matte tin terminals. It serves as a high-reliability AC-to-DC conversion stage in industrial power supplies.

For engineers reviewing the 689-3N datasheet, 689-3N pinout, 689-3N application, or 689-3N equivalent, this page delivers verified electrical ratings, thermal resistance (R_θJC = 6.0 °C/W), terminal configuration, mechanical dimensions, and RoHS-compliant alternatives for high-current, high-temperature rectification designs.

Technical Context

The 689-3N integrates two fast recovery diodes in a single aluminum-cased package with center-tap negative polarity, enabling full-wave rectification with controlled avalanche characteristics. Its 500 ns trr and 150 A IFSM support surge-tolerant operation in switching power supplies and motor drives.

Thermal design is enabled by low junction-to-case resistance (6.0 °C/W) and a 150 °C maximum junction temperature, allowing sustained 10.5 A output at TC = 100 °C. The electrically isolated case eliminates need for insulating hardware in heatsink-mounted installations.

Key Specifications

Pinout & Package

Package: Aluminum case, electrically isolated, center-tap negative configuration (N), with AC input terminals and cathode-positive (+) and anode-negative (–) outputs. Weight ≈ 30 g. 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 689-3N, VS-15EWH03-M3 offers faster recovery but lacks integrated center tap and case isolation, while MBR1530CT fails on voltage rating and isolation-making 689-3N uniquely suited for high-voltage, heatsink-integrated, center-tap negative rectification.

Availability

689-3N is available at Aetrix Electronics and suitable for industrial switch-mode power supplies, motor drive DC bus rectification, and uninterruptible power systems requiring stable component supply, long-life thermal performance, and RoHS-compliant manufacturing.

Supply support for 689-3N 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 689(e3) series was designed specifically for high-current, high-temperature rectification in mission-critical power conversion systems where electrical isolation, surge resilience, and thermal stability are mandatory.

FAQ

What is the reverse recovery time (trr) specification for the 689-3N?

The 689-3N has a maximum reverse recovery time of 500 ns, measured at IF = 1.0 A, IRM = 1.0 A, and IR(REC) = 0.5 A per leg at 25 °C. This value is confirmed in the RF01151 Rev A datasheet, Page 3, Electrical Characteristics table. The 500 ns trr enables efficient operation in medium-frequency switching power supplies without excessive switching loss.

Does the 689-3N have an electrically isolated case, and why does it matter?

Yes, the 689-3N features an electrically isolated aluminum case, as stated in the "DESCRIPTION" and "APPLICATIONS / BENEFITS" sections of the RF01151 datasheet. This isolation eliminates the need for insulating hardware when mounting directly to a grounded heatsink-reducing assembly cost, improving thermal contact, and preventing ground loops in sensitive power systems using the 689-3N.

What is the maximum junction temperature and thermal resistance of the 689-3N?

The 689-3N has a maximum junction temperature of +150 °C and a junction-to-case thermal resistance (R_θJC) of 6.0 °C/W, per the "MAXIMUM RATINGS" table on Page 1 of RF01151 Rev A. These values define its thermal envelope: with a 6.0 °C/W R_θJC, a 20 °C/W heatsink can sustain 15 A output at TC = 55 °C while keeping T_J ≤ 150 °C in the 689-3N.

Is the 689-3N RoHS compliant, and how is that indicated in the part number?

Yes, the 689-3N is RoHS compliant, denoted by the "(e3)" suffix in its full designation (689-3N(e3)), as defined in the "PART NOMENCLATURE" section on Page 2 of RF01151 Rev A. The "e3" code specifies RoHS-compliant matte tin terminals, and the device meets JESD282-B requirements for lead-free soldering up to 260 °C for 10 seconds-verified in the "MAXIMUM RATINGS" table.

How does the center-tap negative (N) configuration of the 689-3N affect circuit implementation?

The "N" in 689-3N indicates center-tap negative terminal configuration, meaning the center tap serves as the anode-negative (–) reference node. This allows direct connection to system ground or negative rail while delivering positive DC output at the "+" terminal. As shown in the "MECHANICAL and PACKAGING" section, orientation places the center terminal 90° from AC inputs-enabling intuitive full-wave rectifier layouts without polarity inversion in the 689-3N.