Diodes Incorporated DF1502M

Overview

DF1502M from Diodes Incorporated is a 1.5A glass passivated bridge rectifier with 200V peak repetitive reverse voltage (VRRM), 1.1V forward voltage drop at 1.5A, and 50A non-repetitive surge current rating; designed for PCB-mounted AC/DC front-end conversion in industrial power supplies.

For engineers reviewing the DF1502M datasheet, DF1502M pinout, DF1502M application, or DF1502M equivalent, key selection criteria include VRRM derating for capacitive loads, thermal resistance (40°C/W) under standard PCB layout, IFSM capability for inrush handling, and UL recognition (E94661) for safety-compliant designs.

Technical Context

This single-phase, full-wave bridge rectifier integrates four diodes in a DF-M molded plastic package with tin-plated terminals. It operates across –65°C to +150°C and supports 60Hz resistive/inductive loads without derating - but requires 20% IO reduction for capacitive loads per specification.

Thermal performance is defined with 13×13mm PCB copper land areas (0.03mm thick); junction-to-ambient thermal resistance is 40°C/W. Total capacitance is 25pF at 1MHz/4V reverse bias, and reverse leakage remains ≤10µA at 25°C and ≤500µA at 125°C under rated blocking voltage.

Key Specifications

Pinout & Package

DF1502M uses the DF-M surface-mount package: molded plastic case (UL 94V-0), 7.4–7.9mm length (A), 6.2–6.5mm width (B), 8.13–8.51mm height (H), with four terminals marked AC1, AC2, +, and – on the case.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU2K and MB152, DF1502M uniquely combines UL recognition, optimized SMT footprint, and balanced trade-offs among VFM, IFSM, and thermal resistance - making it preferred for industrial and safety-critical AC/DC front-ends where certification and manufacturability are jointly prioritized.

Availability

DF1502M is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, appliance motor control boards, and LED driver input stages requiring stable component supply and long-lifecycle support.

Supply support for DF1502M 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, specializing in high-reliability power management, signal integrity, and protection solutions.

The DF-series bridge rectifiers target cost-effective, certified AC/DC conversion for industrial, appliance, and lighting applications - emphasizing safety compliance, thermal robustness, and SMT manufacturability.

FAQ

What is the maximum allowable ambient temperature for DF1502M at full 1.5A load?

At 1.5A average output current, power dissipation is approximately 4.4W (4 × 1.1V × 1.5A). With RθJA = 40°C/W, junction temperature rise is 176°C above ambient. Since Tj,max = 150°C, the maximum safe ambient temperature is –26°C - meaning full-load operation requires active cooling or derating. Per Fig.1, IO must be reduced to ~0.9A at +40°C ambient for safe operation without heatsinking.

Is DF1502M suitable for use with capacitive input filters?

Yes, but with mandatory 20% current derating per datasheet note. Capacitive loads cause high inrush currents that stress the rectifier beyond its average current rating. For example, at 40°C ambient, the usable IO drops from 1.5A to 1.2A. Designers must verify IFSM margin against actual inrush waveform and ensure bulk capacitor ESR and size do not exceed surge energy limits defined by the 10.4 A²s I²t rating.

Does DF1502M require a heatsink in typical PCB applications?

No external heatsink is required if PCB layout follows the datasheet's thermal reference: 13×13mm copper land areas (0.03mm thick) per terminal. Under those conditions and at ≤0.9A load in still air, junction temperature stays within limits. However, in enclosed enclosures or high ambient (>50°C), thermal simulation or empirical testing is recommended - especially when operating near the 1.5A rating or with elevated IFSM events.

How does the UL Recognition (E94661) benefit end-product certification?

UL Recognition confirms the DF1502M meets component-level safety requirements for flammability (94V-0), electrical insulation, and construction integrity. This allows designers to claim "UL-recognized components" in their technical files, reducing test scope for end-equipment standards like UL 62368-1. It eliminates need for separate dielectric strength or glow-wire testing of the rectifier itself - accelerating time-to-certification for industrial and medical power supplies.