AMC21MMST Card Edge Connector Equivalent & Substitute Parts

Part Overview

The AMC21MMST is a 42-position male card edge connector manufactured by Sullins Connector Solutions, designed to interface with female edgecards at 0.100" (2.54mm) pitch. This connector features dual read-out configuration, gold-plated beryllium copper contacts, and operates across -65°C to 200°C. The AMC21MMST is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure ongoing component availability for production and field service applications.

Substiute Parts

AMC21MMST

Sullins Connector SolutionsIn Stock: 870AMC21MMST Datasheet

Current PartRFQ

RMC21MMST

Sullins Connector SolutionsIn Stock: 1074RMC21MMST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete AMC21MMST with the active RMC21MMST is based on electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility:

• Identical position count (42 positions)
• Matching pitch specification (0.100" / 2.54mm)
• Identical row configuration (2 rows)
• Equivalent contact finish (gold plating at 30.0µin thickness)
• Matching operating temperature range (-65°C ~ 200°C)
• Identical termination method (solder)

Mechanical Compatibility:

• Same connector gender (male)
• Identical flange configuration (flush mount, top opening, threaded insert 4-40)
• Matching insulation material (Polyphenylene Sulfide)
• Dual read-out configuration maintained

Compliance Alignment:

• Both parts maintain ROHS3 compliance
• Both parts classified as REACH Unaffected
• Moisture sensitivity level identical (MSL 1 - Unlimited)

The RMC21MMST represents the active production equivalent with enhanced availability and current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

The RMC21MMST is the direct active equivalent for the obsolete AMC21MMST. Selection of the RMC21MMST is supported by the following engineering factors:

Product Status: The RMC21MMST maintains active production status with current manufacturing support, whereas the AMC21MMST is obsolete and subject to discontinuation of supply.

Regulatory Compliance: Both parts maintain identical ROHS3 compliance certification and REACH Unaffected status, ensuring regulatory alignment for new designs and field replacements.

Electrical Performance: Identical electrical specifications across all critical parameters—position count, pitch, operating temperature range, contact finish thickness, and termination method—ensure functional equivalence in circuit applications.

Mechanical Interface: Matching flange configuration, insulation material, and connector geometry provide direct mechanical compatibility with existing PCB layouts and mating edgecard designs.

Contact Material Difference: The RMC21MMST employs phosphor bronze contacts compared to beryllium copper in the AMC21MMST. Both materials provide equivalent electrical conductivity and corrosion resistance at the specified gold plating thickness of 30.0µin.

Availability: The RMC21MMST is available in current inventory (981 pieces), providing immediate procurement capability for production and service applications.

Frequently Asked Questions (FAQ)

Q: Can the RMC21MMST directly replace the AMC21MMST in existing designs?

A: Yes. The RMC21MMST provides direct functional and mechanical replacement. Both connectors share identical electrical specifications, pitch, position count, row configuration, operating temperature range, and flange geometry. The connectors are interchangeable at the circuit board level.

Q: What is the difference between beryllium copper and phosphor bronze contacts?

A: Both materials provide equivalent electrical conductivity and mechanical durability for card edge connector applications. The contact finish (gold plating at 30.0µin thickness) is identical on both parts, providing equivalent corrosion resistance and signal integrity. The material difference does not affect electrical performance or reliability in this application.

Q: Are there any compatibility issues with existing edgecard designs?

A: No. Both the AMC21MMST and RMC21MMST are designed to interface with female edgecards at 0.100" (2.54mm) pitch with identical flange mounting specifications. The RMC21MMST specifies 0.062" (1.57mm) card thickness, which represents the standard thickness for this connector class.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the AMC21MMST and RMC21MMST maintain ROHS3 compliance and REACH Unaffected status. The RMC21MMST, as an active product, continues to meet current regulatory standards for new production and field service applications.

Q: What is the significance of the "dual read-out" configuration?

A: Dual read-out indicates that the connector provides signal access from both sides of the card edge interface, enabling flexible circuit design and signal routing options. Both the AMC21MMST and RMC21MMST maintain this dual read-out capability.

Q: Is the black color of the RMC21MMST a functional difference?

A: No. Color is a cosmetic specification that does not affect electrical or mechanical performance. The black insulation material (PPS) is identical in composition to the unspecified color variant of the AMC21MMST.

Q: What is the moisture sensitivity level, and why is it important?

A: Both parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These connectors can be stored and handled under standard environmental conditions without special moisture control measures, simplifying inventory management and field service operations.