1A1-TP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The 1A1-TP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 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 support and procurement continuity. Substitute parts must maintain electrical performance across voltage, current, and thermal specifications while accommodating package form factor variations.

Substiute Parts

1A1-TP

Micro Commercial CoIn Stock: 9531A1-TP Datasheet

Current PartRFQ

1N4001-G

Comchip TechnologyIn Stock: 563741N4001-G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1A1-TP is determined by equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 50 V minimum
• Current - Average Rectified (Io): 1 A minimum
• Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A maximum
• Speed: Standard Recovery >500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 5 µA @ 50 V maximum
• Capacitance @ Vr, F: 15 pF @ 4V, 1MHz maximum
• Operating Temperature - Junction: -55°C to 150°C minimum

Mechanical Equivalence Criteria:

• Mounting Type: Through Hole
• Package Category: Axial form factor (R-1 or DO-41 compatible)

The 1N4001-G manufactured by Comchip Technology satisfies all electrical parameters and maintains through-hole axial mounting compatibility, though in a DO-41 package variant. This substitution is valid for applications where package footprint accommodation is feasible.

Parameter Comparison

Engineering Selection Recommendations

The 1N4001-G is a direct electrical equivalent to the 1A1-TP with identical performance across all specified voltage, current, thermal, and recovery characteristics. The primary distinction is product status: the 1A1-TP is obsolete while the 1N4001-G is active, ensuring long-term availability and supply chain continuity.

Both parts maintain ROHS3 compliance and identical operating temperature ranges, supporting regulatory and environmental requirements. The 1N4001-G is supplied in DO-41 packaging (Cut Tape format) with significantly higher inventory availability (56,269 units in stock versus 879 units for the obsolete 1A1-TP).

Package form factor differences between R-1 and DO-41 axial packages are minor and do not affect electrical performance. PCB layout accommodation for the DO-41 variant is standard in through-hole rectifier applications.

Frequently Asked Questions (FAQ)

Q: Can the 1N4001-G directly replace the 1A1-TP in existing designs?

A: Yes. The 1N4001-G meets all electrical specifications of the 1A1-TP, including reverse voltage, forward current, forward voltage drop, recovery speed, reverse leakage, and operating temperature range. Both are through-hole axial diodes with compatible mechanical mounting.

Q: What is the difference between R-1 and DO-41 packages?

A: Both are axial through-hole packages for general purpose rectifier diodes. The R-1 and DO-41 (DO-204AL) designations refer to standardized package outlines. Physical dimensions differ slightly, but both accommodate standard 0.1-inch PCB hole spacing and are functionally interchangeable in through-hole applications.

Q: Why is the 1A1-TP listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Micro Commercial Co. The 1N4001-G provides an active alternative with identical electrical performance and superior supply availability.

Q: Are there compliance differences between the two parts?

A: No. Both the 1A1-TP and 1N4001-G are ROHS3 compliant with identical moisture sensitivity levels (MSL 1 - Unlimited) and ECCN classification (EAR99).

Q: What inventory considerations apply to this substitution?

A: The 1N4001-G has 56,269 units in stock compared to 879 units for the obsolete 1A1-TP. For new designs or long-term production, the 1N4001-G ensures sustained component availability.

Q: Are thermal characteristics identical?

A: Yes. Both parts operate across the same junction temperature range of -55°C to 150°C, supporting identical thermal design margins.