Vishay General Semiconductor - Diodes Division B125C800DM-E3/45

Overview

B125C800DM-E3/45 from Vishay General Semiconductor is a glass passivated single-phase bridge rectifier in DFM package, rated for 200 V repetitive peak reverse voltage (V_RRM), 0.9 A average forward output current (I_F(AV)), and 45 A non-repetitive peak surge current (I_FSM). It delivers low 1.0 V forward voltage drop at 0.9 A and supports general-purpose AC/DC full-wave rectification in battery chargers and lighting ballasts.

For engineers reviewing the B125C800DM-E3/45 datasheet, B125C800DM-E3/45 pinout, B125C800DM-E3/45 application, or B125C800DM-E3/45 equivalent, key selection criteria include its 200 V V_RRM, 125 °C maximum junction temperature, DFM surface-mount package with matte tin-plated leads, and compliance with JESD 22-B106 solder dip (275 °C/10 s).

Technical Context

This device implements a quad-diode single-phase bridge configuration with internal interconnections optimized for high-efficiency full-wave rectification. Its glass passivation ensures stable reverse leakage (<10 μA at rated V_RRM) and robust thermal performance up to 125 °C junction temperature.

The DFM package provides mechanical stability for automated placement and meets UL 94 V-0 flammability rating. Thermal resistance is specified as 40 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead) under defined PCB mounting conditions (0.5" × 0.5" copper pads).

Key Specifications

Pinout & Package

Package: DFM - Surface-mount, molded plastic case with 4 external terminals (AC1, AC2, +, –), UL 94 V-0 rated, 0.350" × 0.300" footprint (8.9 mm × 7.6 mm), lead pitch 0.185" (4.69 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with B125C800DM-E3/45, GBU4K-E3/45 offers higher voltage margin but identical mounting; DB107S provides greater surge tolerance and voltage rating in a smaller body but demands thermal redesign and layout change.

Availability

B125C800DM-E3/45 is available at Aetrix Electronics and suitable for battery chargers, LED lighting ballasts, and office equipment power supplies requiring stable component supply, RoHS-compliant sourcing, and consistent DFM package delivery.

Supply support for B125C800DM-E3/45 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 and industrial-grade performance.

The C800DM series targets cost-sensitive, high-volume AC/DC front-end applications where compact size, surge robustness, and automated assembly compatibility are essential.

FAQ

What is the maximum operating temperature for B125C800DM-E3/45?

The B125C800DM-E3/45 has a maximum junction temperature (T_J) of 125 °C and a storage temperature range of –40 °C to +150 °C. Its thermal resistance is specified as 40 °C/W (junction-to-ambient) on a standard PCB with 0.5" × 0.5" copper pads. Derating curves in the datasheet show that average forward current must be reduced above 45 °C ambient to maintain safe operation. Engineers must verify actual board-level thermal performance using the B125C800DM-E3/45's R_θJA and R_θJL values in their specific layout.

Is B125C800DM-E3/45 RoHS-compliant and lead-free?

Yes, the B125C800DM-E3/45 is RoHS-compliant and lead-free. The "E3" suffix indicates commercial-grade, RoHS-compliant construction with matte tin-plated leads that meet J-STD-002 and JESD 22-B102 solderability standards. It also passes JESD 201 Class 1A whisker testing. All materials comply with Vishay's material categorization guidelines per document 99912, and the molding compound meets UL 94 V-0 flammability requirements.

What does the "C800DM" designation indicate in B125C800DM-E3/45?

The "C800DM" portion of B125C800DM-E3/45 identifies the product family and package: "C" denotes the bridge rectifier series, "800" refers to the 0.9 A I_F(AV) rating, and "DM" specifies the DFM surface-mount package. The "B125" prefix indicates the 200 V V_RRM rating (125 V RMS input). This naming convention aligns across the full family (e.g., B40C800DM = 65 V V_RRM, B380C800DM = 600 V V_RRM), enabling quick identification of voltage grade and package type for the B125C800DM-E3/45.

Can B125C800DM-E3/45 be used in capacitive-input filter configurations?

Yes, the B125C800DM-E3/45 supports capacitive-input (C-load) configurations with a maximum recommended load capacitance of 1000 μF at 125 V RMS input. The datasheet specifies minimum series resistance (R_T = 4.0 Ω) for C-load operation at ±10 % VRMS tolerance. Its 45 A I_FSM rating ensures safe handling of high inrush currents typical in such topologies. Designers must observe derating curves (Fig. 1) and ensure thermal management accounts for increased conduction losses in C-load mode versus R-/L-load.

What is the polarity marking convention for B125C800DM-E3/45?

The B125C800DM-E3/45 uses standard bridge rectifier polarity marking: the cathode (positive DC output) terminal is marked with a "+" symbol on the device body, and the anode (negative DC output) is marked with a "–". The two AC input terminals (AC1 and AC2) are unmarked but located diagonally opposite the "+" and "–" terminals on the DFM package outline. Polarity must be verified using the mechanical drawing in document 88533, as incorrect orientation will prevent proper rectification and may damage downstream components.