onsemi DF04S

Overview

DF04S from Diodes Incorporated is a 1.0A surface-mount standard recovery bridge rectifier with 400V peak repetitive reverse voltage (VRRM), 1.1V maximum forward voltage at 1.0A, and 10µA maximum reverse leakage current at 25°C. It features glass-passivated die construction, 50A non-repetitive surge capability, and UL recognition (E364304) for use in AC/DC power supplies, LED drivers, and industrial control power stages.

For engineers reviewing the DF04S datasheet, DF04S pinout, DF04S application, or DF04S equivalent, key selection criteria include its 400V blocking rating, thermal resistance of 40°C/W, surface-mount DF-S package compatibility, and compliance with RoHS, halogen-free, and AEC-Q200-capable manufacturing standards.

Technical Context

The DF04S integrates four silicon diodes in a single-phase full-wave bridge configuration, enabling AC-to-DC conversion without external interconnection. Its standard recovery characteristic (typical trr > 500ns) suits line-frequency applications up to 60Hz, with no soft-recovery or fast-switching optimization.

Thermal performance is defined by a junction-to-ambient thermal resistance of 40°C/W on a 5.0mm² copper pad, and derating begins above +40°C ambient per the published output current curve. The device operates across –55°C to +150°C, supporting industrial and automotive-qualified environments when sourced through IATF 16949 facilities.

Key Specifications

Pinout & Package

Package: DF-S molded plastic package (UL 94V-0), dimensions 7.4–7.9 mm × 6.2–6.5 mm × 2.4–2.6 mm height, with tin-plated terminals solderable per MIL-STD-202.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU4K and MB6S, the DF04S offers optimal balance of SMT compatibility, 400V rating for 230VAC systems, and lowest total BOM cost in high-volume consumer and industrial power supplies where strict footprint constraints apply.

Availability

DF04S is available at Aetrix Electronics and suitable for AC/DC power supplies, LED driver input stages, and industrial control power modules requiring stable component supply, RoHS-compliant sourcing, and DF-S package compatibility.

Supply support for DF04S 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The DF-S bridge rectifier series targets cost-sensitive, high-volume power conversion applications where surface-mount reliability, safety certification, and thermal efficiency at line frequency are critical design requirements.

FAQ

What is the maximum allowable ambient temperature for continuous 1.0A operation?

The DF04S is rated for 1.0A average forward current only at TA = +40°C. Above this temperature, current must be linearly derated per Figure 1 in the datasheet: at +80°C ambient, maximum IF(AV) drops to approximately 0.6A. Thermal design must ensure junction temperature remains ≤+150°C under worst-case load and airflow conditions.

Is the DF04S suitable for high-frequency switching applications like PFC or flyback converters?

No - the DF04S is a standard recovery bridge rectifier with typical reverse recovery time exceeding 500ns. It is intended for 50/60Hz line-frequency rectification only. Using it in high-frequency (>20kHz) circuits causes excessive switching losses, overheating, and potential failure. Fast or ultrafast recovery bridges (e.g., GBU6J, DB107) are required for SMPS primary-side rectification.

Does the DF04S require heatsinking in typical applications?

Heatsinking is not required for 1.0A operation at TA ≤ +40°C with the standard 5.0mm² copper pad (RθJA = 40°C/W). However, at higher ambient temperatures or sustained loads near rating, adding thermal vias or local copper pour reduces junction temperature. No external heatsink is needed unless power dissipation exceeds ~0.8W or ambient exceeds +60°C.

How is polarity marked on the DF04S package?

The DF04S uses surface marking: a white bar or "|" symbol on the top surface indicates the ~AC1 terminal side. The +DC and –DC terminals are identified by silkscreen "+" and "–" symbols adjacent to their respective pads. Pin 1 (~AC1) is located at the left end of the package when the marking bar is oriented left-to-right, matching the top-view diagram in DS17001 Rev. 19-2.