3M 929700-01-21 Equivalent & Substitute Parts

Part Overview

The 3M 929700-01-21 is a rectangular connector header designed for through-hole mounting applications. This 21-position, single-row connector operates at 2.54mm pitch and is rated for 2.5A continuous current with an operating temperature range of -40°C to 105°C. The connector features tin-lead plated copper alloy contacts and a glass-filled polybutylene terephthalate (PBT) insulation body with UL94 V-0 flammability rating.

The product maintains Active status in the manufacturer's portfolio. Identification of equivalent and substitute parts becomes necessary when addressing supply chain constraints, design revisions requiring enhanced specifications, or when transitioning to RoHS-compliant alternatives for new production runs.

Substiute Parts

929700-01-21

3MIn Stock: 859929700-01-21 Datasheet

Current PartRFQ

4-103321-8

TE Connectivity AMP ConnectorsIn Stock: 28654-103321-8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3M 929700-01-21 is evaluated based on the following critical parameters that define functional and mechanical compatibility:

Pitch and Contact Geometry: The 2.54mm (0.100") mating pitch is the primary determinant for mechanical interchangeability. Substitute parts must maintain this pitch specification to ensure proper mating with corresponding receptacle connectors.

Mounting Configuration: Through-hole solder termination and single-row layout define the board-level integration method. Substitute parts must preserve this mounting architecture.

Electrical Performance: Current rating and operating temperature range establish the electrical envelope. Substitute parts must meet or exceed the 2.5A current rating and -40°C to 105°C temperature specification.

Material and Compliance: Contact material (copper alloy), insulation material (PBT or equivalent thermoplastic), and flammability rating (UL94 V-0) define the physical and safety characteristics. RoHS compliance status is noted for regulatory alignment in new designs.

Position Count Flexibility: While the main part specifies 21 positions, substitute parts with higher position counts (such as 40-position variants) remain functionally compatible when only a subset of positions is populated, provided the pitch and mounting method remain constant.

The identified substitute part TE Connectivity AMP Connectors 4-103321-8 shares the critical pitch, mounting type, and termination method, enabling functional substitution despite differences in position count and compliance status.

Parameter Comparison

Engineering Selection Recommendations

For Active Production with RoHS Compliance Requirements: The TE Connectivity 4-103321-8 provides ROHS3 compliance, addressing regulatory requirements for new designs entering markets with RoHS mandates. The higher current rating (3A versus 2.5A) and extended lower operating temperature limit (-65°C versus -40°C) offer enhanced electrical and thermal margins.

For Direct Replacement in Existing Designs: The 3M 929700-01-21 maintains Active product status, ensuring continued availability and supply chain stability. This part remains the preferred choice when RoHS compliance is not a design constraint and existing inventory or qualification data exists.

Position Count Consideration: The TE Connectivity substitute provides 40 positions compared to the 21-position main part. Designs utilizing fewer than 40 positions can employ the substitute with partial population, though this approach introduces additional board real estate and potential assembly complexity. Designs requiring exactly 21 positions should evaluate whether the higher position count introduces unacceptable form factor changes.

Contact Finish Transition: The main part specifies tin-lead plating while the substitute uses tin plating. This difference reflects RoHS compliance requirements and does not impact electrical performance for standard applications. Designs with specific solder compatibility requirements should verify compatibility with lead-free solder processes.

Frequently Asked Questions (FAQ)

Q: Can the TE Connectivity 4-103321-8 directly replace the 3M 929700-01-21 in existing PCB designs?

A: Mechanical and electrical substitution is possible when the design accommodates the 40-position connector footprint. The critical parameters—2.54mm pitch, through-hole mounting, solder termination, and male pin contact type—are identical. However, the increased position count requires verification that the additional connector length does not conflict with board layout or component placement.

Q: What is the impact of the different contact post lengths (0.110" versus 0.125")?

A: The post length difference of 0.015" (0.38mm) affects solder joint formation and PCB trace routing beneath the connector. Designs with tight vertical clearance or specific solder fillet requirements should account for this variation. Both lengths remain within standard through-hole soldering parameters.

Q: Does the tin-lead to tin contact finish change affect solder joint reliability?

A: The transition from tin-lead to tin plating reflects RoHS compliance and does not degrade solder joint reliability in standard applications. Designs using lead-free solder processes are compatible with both finishes. Designs requiring specific solder alloy compatibility should verify the substitute's performance with their designated solder composition.

Q: Why is the TE Connectivity part marked as Obsolete while the 3M part is Active?

A: Product status reflects manufacturer lifecycle management and does not indicate technical obsolescence. The TE Connectivity part may have been superseded by newer variants within their product line. For new designs, the Active status of the 3M part provides assurance of continued availability, while the Obsolete status of the TE Connectivity part indicates limited future supply.

Q: Can I use only a subset of the 40 positions on the TE Connectivity connector?

A: Yes. Partial population of the 40-position connector is mechanically and electrically valid. The unused positions remain unpopulated on both the connector and PCB. This approach is acceptable when supply constraints or design revisions necessitate the substitute, provided the board layout accommodates the full connector footprint.

Q: What are the key electrical differences between these connectors?

A: The TE Connectivity substitute provides a higher current rating (3A versus 2.5A) and an extended lower operating temperature limit (-65°C versus -40°C). These enhancements provide additional design margin but do not alter the fundamental electrical performance for applications within the original part's specifications.