R1800-AP Equivalent & Substitute Parts

Part Overview

The R1800-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 1800 V DC reverse voltage with 500 mA average rectified current in a through-hole DO-41 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 standard through-hole mounting requirements.

Substiute Parts

R1800-AP

Micro Commercial CoIn Stock: 784R1800-AP Datasheet

Current PartRFQ

RGP02-18E-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 3154RGP02-18E-E3/54 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete R1800-AP is based on matching the following critical electrical and mechanical parameters:

• Reverse Voltage Rating: 1800 V DC minimum
• Average Rectified Current: 500 mA minimum
• Reverse Leakage Current: 5 µA maximum at rated voltage
• Mounting Configuration: Through-hole axial package (DO-41 / DO-204AL)
• Compliance: ROHS3 compliance required
• Temperature Range: Operating junction temperature capability

The RGP02-18E-E3/54 from Vishay General Semiconductor meets all substitution criteria. This part is classified as active, ensuring long-term availability and supply chain stability. Both the main part and substitute maintain identical reverse voltage and current ratings with compatible package geometries suitable for direct board-level replacement.

Parameter Comparison

Engineering Selection Recommendations

The RGP02-18E-E3/54 is the qualified substitute for the obsolete R1800-AP based on the following engineering criteria:

Electrical Equivalence: Both parts maintain identical reverse voltage (1800 V) and average rectified current (500 mA) ratings with matching reverse leakage specifications (5 µA @ 1800 V). Forward voltage performance of the substitute is superior, reducing power dissipation in rectification applications.

Thermal Performance: The RGP02-18E-E3/54 extends the operating junction temperature range to -65 to 175 °C, providing enhanced thermal margin compared to the original -55 to 150 °C specification. This improvement accommodates wider environmental operating conditions without performance degradation.

Recovery Characteristics: The substitute features fast recovery (≤ 500 ns) compared to the standard recovery (> 500 ns) of the original part. Fast recovery reduces switching losses and improves efficiency in high-frequency rectification circuits.

Compliance and Availability: Both parts maintain ROHS3 compliance. The substitute is classified as active product status, ensuring continuous manufacturing support and supply chain availability. The original part's obsolete status creates procurement risk and potential supply discontinuation.

Package Compatibility: Identical DO-41 / DO-204AL axial through-hole packaging enables direct mechanical and electrical substitution without circuit board redesign or component repositioning.

Frequently Asked Questions (FAQ)

Q: Can the RGP02-18E-E3/54 be used as a direct replacement for the R1800-AP in existing designs?

A: Yes. Both parts share identical reverse voltage (1800 V), average rectified current (500 mA), reverse leakage current (5 µA @ 1800 V), and through-hole DO-41 package geometry. Direct board-level substitution is supported without circuit modification.

Q: What is the difference between standard recovery and fast recovery diodes?

A: Recovery speed refers to the time required for reverse current to cease after the diode transitions from forward to reverse bias. The R1800-AP specifies standard recovery (> 500 ns), while the RGP02-18E-E3/54 provides fast recovery (≤ 500 ns). Fast recovery reduces switching losses and improves efficiency in high-frequency applications. Both specifications are compatible with the same circuit topology.

Q: Does the extended temperature range of the substitute part affect circuit performance?

A: The RGP02-18E-E3/54 extends the operating junction temperature range to -65 to 175 °C compared to the original -55 to 150 °C. This provides additional thermal margin and does not negatively impact circuit performance. Applications operating within the original temperature range experience no functional change.

Q: Are both parts RoHS compliant?

A: Yes. Both the R1800-AP and RGP02-18E-E3/54 are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the significance of the substitute part's lower forward voltage specification?

A: The RGP02-18E-E3/54 specifies 1.8 V forward voltage at 100 mA, compared to 2 V at 500 mA for the original part. Lower forward voltage reduces power dissipation during rectification, improving overall circuit efficiency. This represents an improvement over the original specification and does not create compatibility issues.

Q: Why is the R1800-AP classified as obsolete?

A: Obsolete classification indicates the manufacturer has discontinued production and support for this part. The RGP02-18E-E3/54 provides an active, supported alternative with equivalent electrical performance and enhanced specifications, ensuring long-term design viability and supply chain continuity.

Q: Are there packaging differences between the two parts?

A: Both parts use identical through-hole axial packaging (DO-41 / DO-204AL). No mechanical or board-level modifications are required for substitution. The RGP02-18E-E3/54 is supplied in cut tape (CT) packaging format.