M20-9971845 Equivalent & Substitute Parts

Part Overview

The M20-9971845 is a rectangular connector header manufactured by Harwin Inc., designed for through-hole mounting applications. This connector features a vertical orientation with 36 positions arranged in 2 rows at 0.100" (2.54mm) pitch. The part is classified as obsolete, making identification of suitable alternatives necessary for ongoing design support and component procurement.

Substiute Parts

M20-9971845

Harwin Inc.In Stock: 1215M20-9971845 Datasheet

Current PartRFQ

M20-9973646

Harwin Inc.In Stock: 777M20-9973646 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the M20-9971845 is based on the following critical parameters that must remain consistent:

• Pitch - Mating: 0.100" (2.54mm)
• Row Spacing - Mating: 0.100" (2.54mm)
• Connector Type: Header, Cuttable
• Contact Type: Male Pin
• Mounting Type: Through Hole
• Termination: Solder
• Contact Material: Brass
• Insulation Material: Polyamide (PA6T), Nylon 6T
• Operating Temperature Range: -40°C ~ 105°C
• Current Rating: 3A per Contact
• Material Flammability Rating: UL94 V-0

The substitute part M20-9973646 maintains these core electrical and mechanical parameters. The primary difference is the number of positions (72 vs. 36), which represents a higher-capacity variant within the same M20 series. This allows the substitute to function in applications requiring additional contact positions while preserving all fundamental connector characteristics.

Parameter Comparison

Engineering Selection Recommendations

The M20-9973646 is an active product within the Harwin M20 series and maintains full compliance with ROHS3 and REACH requirements. As the original M20-9971845 is obsolete, the M20-9973646 provides continuity of supply while preserving all critical electrical and mechanical specifications. Both connectors share identical pitch, row spacing, contact material, insulation material, operating temperature range, current rating, and flammability classification.

The primary design consideration is the increased position count (72 vs. 36). Applications requiring exactly 36 positions may utilize the cuttable header feature of the M20-9973646 to achieve the required configuration. The contact finish differs (gold vs. tin), which reflects standard material specifications for active production variants within the series.

Frequently Asked Questions (FAQ)

Q: Can M20-9973646 directly replace M20-9971845 in existing designs?

A: The M20-9973646 maintains all critical electrical and mechanical parameters including pitch, row spacing, contact type, mounting method, and current rating. The cuttable header design allows configuration to 36 positions if required. The primary consideration is the contact finish difference (tin vs. gold) and the increased overall position count of the substitute part.

Q: What is the significance of the "cuttable" header designation?

A: Both connectors feature cuttable headers, allowing the connector to be segmented to the required number of positions. This design feature enables the 72-position M20-9973646 to be configured for applications requiring fewer positions.

Q: How do the contact finishes differ between these parts?

A: The M20-9971845 features gold plating on mating contacts, while the M20-9973646 uses tin plating. Both finishes are suitable for the specified operating temperature range and current rating. The choice between gold and tin finishes depends on application-specific requirements for contact resistance and environmental exposure.

Q: Are both parts RoHS and REACH compliant?

A: Both the M20-9971845 and M20-9973646 are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and use.

Q: What is the inventory status for these parts?

A: The M20-9971845 has 1180 pieces in stock but is classified as obsolete. The M20-9973646 is an active product with 747 pieces currently in inventory, providing ongoing supply availability.