Diodes Incorporated 1N4001-B

Overview

1N4001-B from Diodes Incorporated is a general-purpose silicon rectifier diode in DO-41 package, rated for 1.0A average forward current and 50V peak repetitive reverse voltage, with 1.0V forward voltage at 1.0A and 5.0μA reverse leakage at 25°C, widely used in AC/DC power supply front-end rectification.

For engineers reviewing the 1N4001-B datasheet, 1N4001-B pinout, 1N4001-B application, or 1N4001-B equivalent, key selection criteria include V_RRM, I_O, V_F, I_FSM, and thermal resistance in low-cost linear power supplies and embedded auxiliary rails.

Technical Context

This device implements a diffused P-N junction optimized for high surge tolerance (30A peak) and stable DC blocking up to 50V, with junction-to-ambient thermal resistance of 100K/W under standard lead conditions. Its low 1.0V forward drop at rated current supports efficient energy conversion in non-switching rectifier stages.

Designed for single-phase, half-wave 60Hz operation with resistive or inductive loads, it requires 20% current derating for capacitive loads. Reverse recovery behavior is not specified, confirming its classification as a standard recovery (not fast or ultrafast) rectifier.

Key Specifications

Pinout & Package

Package: DO-41 molded plastic case (UL 94V-0), axial leaded, cathode indicated by band. Weight: ~0.30 g. Moisture sensitivity level: Level 1 (J-STD-020D).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4001-T, the -B variant offers lower-cost manual or semi-automated assembly; versus S1A, the DO-41 form factor provides superior mechanical robustness and thermal mass for high-surge environments despite larger footprint.

Availability

1N4001-B is available at Aetrix Electronics and suitable for AC/DC power supplies, industrial control auxiliary rails, and automotive aftermarket lighting requiring stable component supply and long-lifecycle availability.

Supply support for 1N4001-B 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, serving industrial, computing, consumer, and communications markets since 1960.

The 1N400x series belongs to Diodes' general-purpose rectifier product line, designed for cost-sensitive, high-volume linear power conversion where reliability, surge tolerance, and manufacturability outweigh high-frequency performance.

FAQ

Is the 1N4001-B suitable for switching power supply applications?

No. The 1N4001-B is a standard-recovery rectifier with no specified reverse recovery time; its use in high-frequency switch-mode topologies causes excessive switching losses and EMI. It is intended for 50/60Hz line-frequency rectification only.

What is the maximum operating temperature for continuous use?

The 1N4001-B has a junction temperature limit of +150°C and an operating/storage range of –65°C to +150°C. At ambient temperatures above +75°C, the average forward current must be derated per Figure 1 in the datasheet to maintain reliability.

Can the 1N4001-B replace the 1N4007 in a 12V DC adapter?

Only if the reverse voltage stress remains below 50V. The 1N4007 supports 1000V V_RRM; substituting the 1N4001-B risks catastrophic failure under transient overvoltage or poor transformer regulation-verify peak reverse voltage in your specific circuit before substitution.

Does the "-B" suffix indicate RoHS compliance?

Yes. Per Diodes Incorporated's DS28002 Rev. 9, all 1N4001-B devices feature lead-free, RoHS-compliant bright tin plating on leads and meet EU Directive 2002/95/EC with applicable exemptions documented in the datasheet notes.