1A4-TP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The 1A4-TP 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, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. The 1A4-TP maintains ROHS3 compliance and operates across a junction temperature range of -55°C to 150°C, making it suitable for standard industrial and consumer applications requiring reliable rectification at moderate voltage and current levels.

Substiute Parts

1A4-TP

Micro Commercial CoIn Stock: 7441A4-TP 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-TP is determined by electrical and mechanical parameter equivalence. The primary substitution criteria are:

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 (Critical):

• Mounting Type: Through Hole
• Package Category: Axial

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The 1N4004-E3/54 meets all electrical and mechanical substitution criteria while offering the advantage of active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The 1N4004-E3/54 manufactured by Vishay General Semiconductor - Diodes Division is a direct electrical and mechanical equivalent to the 1A4-TP. All critical electrical parameters, operating temperature range, and compliance certifications are identical. Both components are ROHS3 compliant with MSL rating of 1 (Unlimited).

The primary distinction is product status: the 1A4-TP is obsolete while the 1N4004-E3/54 is active. The 1N4004-E3/54 offers superior long-term availability with 1656 pieces in current stock inventory compared to the 1A4-TP's 682 pieces of legacy stock.

Package differences exist between the R-1 (1A4-TP) and DO-204AL/DO-41 (1N4004-E3/54) formats, though both are axial through-hole configurations. Physical dimensions and lead spacing may differ; PCB layout verification is required prior to implementation.

The 1N4004-E3/54 is supplied in Cut Tape (CT) packaging, whereas the 1A4-TP packaging format is not specified in available data.

Frequently Asked Questions (FAQ)

Q: Can the 1N4004-E3/54 directly replace the 1A4-TP in existing designs?

A: Electrical substitution is complete. All voltage, current, temperature, and recovery speed parameters are identical. Physical package differences (R-1 versus DO-204AL/DO-41) require PCB layout verification to confirm lead spacing and mounting hole compatibility.

Q: What are the key electrical parameters that determine substitution eligibility?

A: The critical parameters are: 400 V DC reverse voltage rating, 1 A average rectified current, 1.1 V maximum forward voltage at 1 A, standard recovery speed >500ns at >200mA, 5 µA reverse leakage at 400 V, and -55°C to 150°C operating temperature range. All parameters must match for direct substitution.

Q: Are both parts RoHS compliant?

A: Yes. Both the 1A4-TP and 1N4004-E3/54 are ROHS3 compliant with MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions.

Q: Why is the 1N4004-E3/54 preferred over the 1A4-TP?

A: The 1N4004-E3/54 is an active product with higher current inventory availability (1656 pieces), whereas the 1A4-TP is obsolete. For new designs and ongoing procurement, the active part ensures supply chain continuity and long-term availability.

Q: Are there physical mounting differences between these parts?

A: Both components use axial through-hole mounting. However, the R-1 package (1A4-TP) and DO-204AL/DO-41 package (1N4004-E3/54) may have different physical dimensions and lead spacing. PCB design verification is necessary before component substitution.

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

A: Both are axial through-hole diode packages. R-1 is a legacy designation, while DO-204AL (also known as DO-41) is the modern industry standard package for 1 A rectifier diodes. Physical dimensions and lead spacing differ between these formats.