Lumimax Optoelectronic Technology 1N4004-T

Overview

1N4004-T from Diodes Incorporated is a general-purpose silicon rectifier diode in DO-41 package, rated for 400V peak repetitive reverse voltage, 1.0A average forward current, and 30A non-repetitive surge current. It features low forward voltage drop (1.0V at 1.0A), low reverse leakage (5.0μA at 25°C), and is RoHS-compliant with lead-free tin-plated leads - widely used in AC/DC power supplies, battery chargers, and DC motor control circuits.

For engineers reviewing the 1N4004-T datasheet, 1N4004-T pinout, 1N4004-T application, or 1N4004-T equivalent, key selection criteria include its 400V blocking rating, thermal resistance (100°C/W), junction capacitance (15pF), surge capability, and DO-41 mechanical compatibility in legacy and cost-sensitive industrial power designs.

Technical Context

This discrete silicon PN-junction diode uses diffused junction technology to achieve stable forward conduction and reliable reverse blocking. Its 1.0V forward voltage at 1.0A enables efficient rectification in low-to-medium power linear supplies, while the 400V V_RRM supports standard 230VAC input with margin.

The device operates across –65°C to +150°C and exhibits low reverse leakage (5.0μA @ 25°C, 50μA @ 100°C), making it suitable for ambient-stable applications where thermal drift must be minimized. Junction capacitance of 15pF at 4V reverse bias supports moderate-frequency rectification without excessive switching loss.

Key Specifications

Pinout & Package

Package: DO-41 molded plastic case (UL 94V-0), 0.30g weight, cathode band marking, bright tin-plated leads solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar general-purpose rectifier applications.

Compared with 1N4004-T, 1N4004G offers identical performance with halogen-free assurance, while STTH1R04 trades slower switching for faster recovery-making it suitable only where di/dt-induced ringing must be suppressed, not for standard line-frequency rectification.

Availability

1N4004-T is available at Aetrix Electronics and suitable for AC/DC power adapters, battery charger input stages, and industrial control logic supplies requiring stable component supply and long-lifecycle support.

Supply support for 1N4004-T 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 North America.

The 1N400x series belongs to Diodes' general-purpose rectifier product line, designed for cost-effective, robust AC/DC conversion in consumer, industrial, and automotive-qualified power systems.

FAQ

Is 1N4004-T suitable for use in switching power supplies?

No - the 1N4004-T has a typical reverse recovery time of ~2μs and is optimized for 50/60Hz line-frequency rectification. Using it in high-frequency SMPS (>20kHz) causes excessive switching loss and overheating. Fast-recovery or ultrafast diodes like STTH1R04 or MUR105 are required instead.

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

The 1N4004-T supports 1.0A average forward current only up to +75°C ambient temperature, as specified in the datasheet. Above this, current must be linearly derated - e.g., ~0.7A at +100°C - due to thermal resistance of 100°C/W and junction temperature limit of +150°C.

Does the cathode band indicate polarity during PCB layout?

Yes - the black cathode band on the DO-41 body identifies the cathode terminal. In schematic symbols and PCB footprints, the band must align with the cathode pad (typically marked "K" or with a "-" sign), ensuring correct orientation for forward conduction and reverse blocking.

Why is the 1N4004-T not recommended for new designs?

Diodes Incorporated states the 1N4001–1N4007 family is not recommended for new designs due to industry shift toward lower-loss, faster, and more thermally efficient alternatives (e.g., Schottky or fast-recovery diodes). Legacy compatibility and cost remain valid for repair, replacement, or maintenance of existing equipment.