RL257M-AP Equivalent & Substitute Parts

Part Overview

The RL257M-AP is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 2.5 A average rectified current in a DO-15 axial through-hole package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The RL257M-AP remains available in inventory (918 pieces) but active substitutes with identical electrical specifications are available to ensure long-term component sourcing reliability.

Substiute Parts

RL257M-AP

Micro Commercial CoIn Stock: 930RL257M-AP Datasheet

Current PartRFQ

RL257GP-AP

Micro Commercial CoIn Stock: 1178RL257GP-AP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RL257M-AP is determined by equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 1000 V
• Current - Average Rectified (Io): 2.5 A
• Speed classification: Standard Recovery >500ns, > 200mA (Io)
• Operating Temperature - Junction: -55°C to 150°C
• Current - Reverse Leakage @ Vr: 5 µA @ 1000 V

Mechanical Equivalence Criteria:

• Mounting Type: Through Hole
• Base Product Number: RL257
• Manufacturer: Micro Commercial Co
• RoHS Status: ROHS3 Compliant

The RL257GP-AP meets all electrical and mechanical substitution criteria. Minor variations in forward voltage (1.1 V vs. 1 V @ 2.5 A) and capacitance (40 pF vs. 35 pF @ 4V, 1MHz) remain within acceptable tolerance ranges for general-purpose rectification applications. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

RL257GP-AP is the primary substitute for RL257M-AP based on the following factors:

1. Product Status: The RL257GP-AP is classified as Active, ensuring continued manufacturer support and long-term availability. The RL257M-AP is Obsolete, presenting procurement risk for future production requirements.

2. Electrical Equivalence: All critical electrical parameters match or remain within acceptable tolerance. Forward voltage differential (0.1 V maximum) and capacitance variation (5 pF maximum) do not impact functional performance in standard rectification circuits.

3. Compliance: Both components maintain ROHS3 compliance and identical moisture sensitivity levels (MSL 1 - Unlimited), ensuring compatibility with current manufacturing and environmental standards.

4. Inventory Status: The RL257GP-AP has higher inventory availability (1123 pieces vs. 918 pieces), supporting immediate procurement needs.

5. Package Consideration: The RL257GP-AP uses R-3 packaging (Tape & Box format) versus the RL257M-AP DO-15 format. Both are axial through-hole configurations with identical lead spacing and mounting compatibility on standard PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can RL257GP-AP directly replace RL257M-AP in existing designs?

A: Yes. Both components share identical electrical ratings (1000 V, 2.5 A, -55°C to 150°C) and through-hole axial mounting. The R-3 package of the RL257GP-AP is mechanically compatible with DO-15 footprints on PCBs designed for axial diodes.

Q: What is the significance of the forward voltage difference (1 V vs. 1.1 V)?

A: The 0.1 V difference at 2.5 A represents a 10% variation within normal manufacturing tolerance for general-purpose rectifier diodes. This does not affect circuit performance in standard power supply and rectification applications where forward voltage drop is not a critical design parameter.

Q: Why does the RL257M-AP show as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production. The RL257GP-AP, sharing the same base product number (RL257) and electrical specifications, represents the active continuation of this product line.

Q: Are there package compatibility concerns when switching from DO-15 to R-3?

A: No. Both DO-15 and R-3 are axial through-hole packages with standard lead spacing. PCB footprints designed for axial diodes accommodate both package types without modification.

Q: Does the capacitance difference (35 pF vs. 40 pF) affect circuit operation?

A: No. The 5 pF difference at 4V, 1MHz is negligible for general-purpose rectification. Capacitance specifications for rectifier diodes are secondary parameters that do not influence primary rectification function.

Q: Is the RL257GP-AP available in the same packaging format as RL257M-AP?

A: The RL257GP-AP is supplied in Tape & Box (TB) format, whereas the RL257M-AP was supplied in standard packaging. Both components are identical axial through-hole diodes suitable for manual and automated assembly processes.