Equivalent & Substitute Parts for 1A4-AP

Part Overview

The 1A4-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 1 A average rectified current in an R-1 axial through-hole package. This component is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates across a junction temperature range of -55°C to 150°C and complies with ROHS3 standards.

Substiute Parts

1A4-AP

Micro Commercial CoIn Stock: 7861A4-AP Datasheet

Current PartRFQ

1N4004-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 16931N4004-E3/54 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1A4-AP is determined by electrical and mechanical parameter equivalence. The following criteria establish functional interchangeability:

Electrical Parameters (Critical):

• Voltage - DC Reverse (Vr) (Max): 400 V
• Current - Average Rectified (Io): 1 A
• Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A
• Speed: Standard Recovery >500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 5 µA @ 400 V
• Capacitance @ Vr, F: 15 pF @ 4V, 1MHz
• Operating Temperature - Junction: -55°C to 150°C

Mechanical Parameters (Required):

• Mounting Type: Through Hole
• Package Category: Axial

The 1N4004-E3/54 meets all specified electrical and mechanical parameters, establishing it as a direct functional equivalent despite differences in package designation (DO-204AL versus R-1) and manufacturer.

Parameter Comparison

Engineering Selection Recommendations

The 1N4004-E3/54 manufactured by Vishay General Semiconductor - Diodes Division is the qualified substitute for the obsolete 1A4-AP. Selection of this substitute is supported by the following factors:

Electrical Equivalence: All critical electrical parameters match exactly, including reverse voltage rating, forward current capacity, forward voltage drop, recovery speed, reverse leakage current, and junction capacitance. Operating temperature range is identical.

Mechanical Compatibility: Both components are through-hole axial diodes. The 1N4004-E3/54 uses the DO-204AL (DO-41) package, which is mechanically and functionally compatible with the R-1 package in standard through-hole PCB applications.

Compliance and Certification: The 1N4004-E3/54 maintains ROHS3 compliance and MSL Level 1 rating, matching the original part's environmental and regulatory status.

Product Status: The 1N4004-E3/54 is active in production, ensuring long-term availability and supply chain continuity compared to the obsolete 1A4-AP.

Frequently Asked Questions (FAQ)

Q: Can the 1N4004-E3/54 be used as a direct replacement for the 1A4-AP in existing designs?

A: Yes. The 1N4004-E3/54 meets all electrical specifications of the 1A4-AP and is mechanically compatible in through-hole applications. Both components are axial diodes with identical voltage, current, and temperature ratings.

Q: What is the difference between the R-1 and DO-204AL packages?

A: R-1 and DO-204AL (DO-41) are both axial through-hole package designations for general-purpose rectifier diodes. They are mechanically and functionally compatible for standard PCB mounting applications. The DO-204AL designation is the more widely used industry standard.

Q: Are there any compliance differences between the 1A4-AP and 1N4004-E3/54?

A: No. Both components are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings. Regulatory and environmental compliance is equivalent.

Q: Why is the 1A4-AP listed as obsolete?

A: The 1A4-AP is no longer in active production. The 1N4004-E3/54 serves as the active equivalent, providing the same electrical and mechanical functionality with ongoing manufacturer support and availability.

Q: Are the forward voltage and reverse leakage specifications identical?

A: Yes. Both the 1A4-AP and 1N4004-E3/54 specify a maximum forward voltage of 1.1 V at 1 A and a reverse leakage current of 5 µA at 400 V. These parameters are electrically equivalent.

Q: What is the recovery speed classification for these diodes?

A: Both components are classified as Standard Recovery diodes with recovery time greater than 500 ns at currents exceeding 200 mA. This classification applies to both the 1A4-AP and 1N4004-E3/54.