Diodes Incorporated 1N4003-T

Overview

1N4003-T from Diodes Incorporated is a general-purpose silicon rectifier diode in DO-41 package, rated for 200 V peak repetitive reverse voltage, 1.0 A average forward current, and 30 A non-repetitive surge current. It features low forward voltage drop (1.0 V at 1.0 A), low reverse leakage (5.0 µA at 25°C), and is RoHS-compliant with bright tin-plated leads for reliable solderability in AC/DC power supply front-end rectification.

For engineers reviewing the 1N4003-T datasheet, 1N4003-T pinout, 1N4003-T application, or 1N4003-T equivalent, key selection criteria include its 200 V blocking rating, thermal resistance (100 °C/W), junction capacitance (15 pF), operating temperature range (–65 to +150 °C), and DO-41 mechanical compatibility in legacy and cost-sensitive power conversion designs.

Technical Context

The 1N4003-T implements a diffused P-N junction optimized for single-phase, half-wave rectification at 60 Hz with resistive or inductive loads. Its design supports standard line-frequency operation without active cooling, with derating required for capacitive loads (–20% current rating).

Thermal performance is defined by junction-to-ambient thermal resistance of 100 °C/W under standard mounting conditions (leads held at ambient, 9.5 mm from case). Junction capacitance is specified at 15 pF (1 MHz, 4 V reverse bias), supporting predictable behavior in low-speed switching and EMI filtering contexts.

Key Specifications

Pinout & Package

Package: DO-41 molded plastic case (UL 94V-0), axial lead configuration with cathode band marking. Dimensions: A = 25.40 mm (length), B = 4.06–5.21 mm (body diameter), C = 0.71–0.864 mm (lead diameter), D = 2.00–2.72 mm (lead spacing).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4003G, the 1N4003-T offers identical performance and footprint; RS207M trades higher voltage margin for marginal conduction loss increase-optimal selection depends on system-level voltage stress analysis and supply chain requirements.

Availability

1N4003-T is available at Aetrix Electronics and suitable for AC/DC power supply input rectification, DC motor flyback protection, and capacitor-input filter stage applications requiring stable component supply across industrial, consumer, and embedded electronics programs.

Supply support for 1N4003-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, engineered for cost-effective, high-reliability AC/DC conversion in legacy and maintenance-critical power systems where proven performance outweighs advanced feature integration.

FAQ

Is the 1N4003-T suitable for use in new designs?

No-Diodes Incorporated explicitly states "THE 1N4001-1N4007 ARE NOT RECOMMENDED FOR NEW DESIGNS" in the July 2024 datasheet. It remains available for replacement, repair, and legacy system support, but new designs should consider modern alternatives with improved efficiency, lower leakage, or AEC-Q200 qualification where required.

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

The 1N4003-T delivers 1.0 A average forward current only at TA = +75°C, as specified in the Absolute Maximum Ratings table. At higher ambient temperatures, current must be derated per Figure 1; at +100°C ambient, usable current drops to approximately 0.7 A due to thermal limitations and RθJA = 100 °C/W.

Can the 1N4003-T be used in full-wave bridge configurations?

Yes-the 1N4003-T is commonly deployed as one of four diodes in discrete full-wave bridge rectifiers. Its DO-41 axial package allows manual or automated placement, and its 200 V VRRM supports bridges up to 100 V RMS input (e.g., 12 V or 24 V transformer secondaries), provided each diode sees no more than half the peak inverse voltage.

Does the 1N4003-T have automotive qualification?

No-the 1N4003-T is not AEC-Q200 qualified. The datasheet notes that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing-these are offered under separate part numbers (e.g., 1N4003Q), not the standard 1N4003-T variant supplied in 5k tape-and-reel packaging.