Equivalent & Substitute Parts Reference: 1N6491 Diode Rectifier

Part Overview

The 1N6491 is a general-purpose rectifier diode in the Diodes, Rectifiers category, manufactured by Microchip Technology. It features a maximum reverse voltage of 600 V, a rectified current rating of 400 mA, and comes in a DO-35 (DO-204AH) axial package for through-hole mounting. The product is listed as Active with available inventory, and its standard recovery speed, junction operating temperature range, and defined reverse leakage attributes are critical for suitable substitutions. Identifying compatible alternative models is necessary to ensure continuity of supply and design flexibility, particularly when managing inventory, compliance, or product phase-out scenarios.

Substiute Parts

1N6491

Microchip TechnologyIn Stock: 9241N6491 Datasheet

Current PartRFQ

1N649-1

Microchip TechnologyIn Stock: 33241N649-1 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Parametric equivalence in diode rectifiers is determined only by matching all relevant electrical and mechanical parameters. The following criteria are applied for substitution of the 1N6491 diode:

• Category: Must be "Diodes, Rectifiers"
• Voltage - DC Reverse (Vr) (Max): 600 V
• Current - Average Rectified (Io): 400 mA
• Voltage - Forward (Vf) (Max) @ If: 1 V @ 400 mA
• Speed: Standard Recovery >500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 50 nA @ 600 V
• Mounting Type: Through Hole
• Package / Case: DO-204AH, DO-35, Axial
• Operating Temperature - Junction: -65°C ~ 175°C
• Product Status: Active

Only parts matching all specified parameters qualify as substitutes.

Parameter Comparison

Engineering Selection Recommendations

Both 1N6491 and 1N649-1 diodes are listed as Active and have matching electrical, mechanical, and compliance attributes. 1N649-1 is RoHS non-compliant, while RoHS status for 1N6491 is not specified in the input data. Evaluate selection based strictly on product status and required regulatory compliance for the end application.

Frequently Asked Questions (FAQ)

Q1: What electrical parameters must match for a diode rectifier substitute?
A: Voltage - DC Reverse (Vr) (Max), Current - Average Rectified (Io), Voltage - Forward (Vf) (Max) @ If, Speed, and Current - Reverse Leakage @ Vr must be identical.

Q2: Which mechanical parameters determine compatibility?
A: Package / Case (DO-204AH, DO-35, Axial), Mounting Type (Through Hole), and Operating Temperature - Junction must match.

Q3: Does RoHS or REACH compliance affect suitability?
A: Substitute selection must consider regulatory and environmental compliance based on application needs and jurisdiction requirements.

Q4: Can 1N649-1 directly replace 1N6491 in the same circuit footprint?
A: Yes, all mechanical and electrical parameters provided indicate compatibility within the constraints of DO-35 axial through-hole mounting.

Q5: Is there any difference in availability between these parts?
A: Both parts are listed as Active in inventory, with supplied quantities as specified.

Q6: How are compliance fields (ECCN, HTSUS) utilized?
A: ECCN and HTSUS parameters are provided for export classification and regulatory reporting. Matching values confirm substitutability in compliance reports.