Vishay General Semiconductor - Diodes Division BU1010A-E3/51

Overview

BU1010A-E3/51 from Vishay General Semiconductor is a 1000 V, 10 A average current enhanced isoCink+™ single-in-line bridge rectifier in BU package, featuring glass-passivated junctions, 0.94 V forward voltage at 5.0 A and 150 °C max junction temperature - used in AC/DC full-wave rectification for switching power supplies and white-goods motor drives.

For engineers reviewing the BU1010A-E3/51 datasheet, BU1010A-E3/51 pinout, BU1010A-E3/51 application, or BU1010A-E3/51 equivalent, key selection criteria include peak reverse voltage (1000 V), thermal resistance (3.0 °C/W junction-to-case), UL E312394 recognition, RoHS-compliant matte tin leads, and compatibility with 60 W air-cooled heatsinks.

Technical Context

The BU1010A-E3/51 integrates four silicon diodes in a single-phase full-bridge configuration with internal isoCink+™ isolation, enabling high-voltage AC input rectification without external interconnects. Its glass-passivated chip junction ensures stable leakage performance up to 125 °C, with IR ≤ 250 μA at rated VR and TJ = 125 °C.

Designed for conduction in both half-cycles of sinusoidal AC input, it delivers 10 A average output current when mounted on a 60 W air-cooled heatsink (TC = 90 °C), while sustaining 90 A non-repetitive surge (8.3 ms sine wave) and 33 A²s fusing I²t rating.

Key Specifications

Pinout & Package

Package: BU - thin single-in-line molded case with UL 94 V-0 flammability rating, matte tin-plated leads, and polarity marked on body (positive lead has beveled corner).

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU10K-E3/51 and GBU10J-E3/51, the BU1010A-E3/51 offers superior thermal performance (RθJC = 3.0 °C/W) and higher voltage margin in the same functional role, making it preferred for compact, high-reliability AC/DC front-ends where safety and thermal headroom are critical.

Availability

BU1010A-E3/51 is available at Aetrix Electronics and suitable for switching power supplies, home appliance motor controls, and industrial AC-DC auxiliary supplies requiring stable component supply across production lifecycles.

Supply support for BU1010A-E3/51 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

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on reliability, efficiency, and safety certification.

The BU-series enhanced isoCink+™ bridge rectifiers were developed for high-density, thermally demanding AC/DC conversion in consumer and industrial equipment where UL recognition, low VF, and robust surge capability are mandatory.

FAQ

What is the maximum ambient temperature for BU1010A-E3/51 without a heatsink?

Without a heatsink, BU1010A-E3/51 supports up to 3.0 A average forward current at TA = 25 °C (free air). Derating begins above 25 °C, reaching zero current capability at approximately 75 °C ambient - confirmed by Fig. 2 in the datasheet. For sustained 10 A operation, a 60 W air-cooled heatsink is required per the datasheet's TC = 90 °C condition. BU1010A-E3/51 must not be operated beyond its 150 °C junction limit.

Does BU1010A-E3/51 support lead-free soldering processes?

Yes, BU1010A-E3/51 features matte tin-plated leads qualified per J-STD-002 and JESD 22-B102, and is rated for solder dip at 275 °C for up to 10 seconds (per JESD 22-B106). It meets RoHS Directive 2011/65/EU and is compatible with standard lead-free reflow profiles. The E3 suffix explicitly denotes RoHS-compliant commercial-grade construction. BU1010A-E3/51 is not intended for repeated thermal cycling beyond specification limits.

How does the isoCink+™ technology improve safety in BU1010A-E3/51?

isoCink+™ provides reinforced internal isolation between AC input terminals and DC output terminals, enabling safe operation in floating-ground (F.G.) configurations without external insulators. This architecture supports UL E312394 recognition with dielectric strength ≥ 1500 V, reducing risk of creepage/clearance failure in compact designs. BU1010A-E3/51 leverages this to simplify compliance in Class II appliances - no additional insulation hardware is needed when mounting directly to grounded metal chassis.

Can BU1010A-E3/51 replace BU1006A-E3/51 in an existing design?

BU1010A-E3/51 is pin-compatible and mechanically identical to BU1006A-E3/51 (same BU package, pinout, and dimensions), but offers higher VRRM (1000 V vs. 600 V) and identical IF(AV) and thermal specs. It can be a direct upgrade where increased voltage margin is needed - e.g., for 230 V AC mains with poor regulation or surge exposure. No PCB changes are required, though system-level overvoltage testing should confirm benefit. BU1010A-E3/51 retains all electrical and mechanical interfaces of BU1006A-E3/51.

What is the typical junction capacitance of BU1010A-E3/51 and how does it affect EMI?

BU1010A-E3/51 exhibits typical junction capacitance of 30 pF per diode at 4.0 V and 1 MHz (measured per datasheet Table on page 2). This low CJ value minimizes high-frequency displacement current during switching transitions, reducing conducted EMI in the 1–30 MHz range. In practice, this contributes to cleaner rectified waveforms and relaxed filtering requirements in EMC-critical applications like medical or industrial power supplies. BU1010A-E3/51's CJ is consistent across the BU10xxA family.