Amphenol ICC 91900-21421 Rectangular Connector Header – Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 91900-21421 is a 21-position surface mount connector header with center strip contacts, gold-plated finish, and solder retention features. This part is classified as obsolete, making identification of active equivalent alternatives essential for ongoing production and design continuity. The connector operates within the Conan™ and MezzSelect™ series, serving applications requiring reliable rectangular connector solutions with SMD mounting capability.

Key Parameters

Parameter	Value
Manufacturer Part Number	91900-21421
Manufacturer	Amphenol ICC (FCI)
Category	Rectangular Connectors
Number of Positions	21
Pitch	0.039" (1.00mm)
Number of Rows	2
Mounting Type	Surface Mount
Connector Type	Header, Center Strip Contacts
Contact Finish	Gold or Gold, GXT™
Contact Finish Thickness	15.0µin (0.38µm)
Mated Stacking Height	6mm
Height Above Board	0.107" (2.72mm)
Features	Solder Retention
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 91900-21421 is determined by strict equivalence across the following critical parameters:

Connector Configuration: 21 positions, 2 rows, 0.039" (1.00mm) pitch
Mounting Technology: Surface mount with solder retention
Contact System: Center strip contacts with gold finish (15.0µin thickness)
Physical Dimensions: 6mm mated stacking height, 0.107" (2.72mm) height above board
Environmental Classification: MSL 1 (Unlimited)

The substitute parts identified maintain identical electrical and mechanical specifications while offering active product status and improved compliance certifications. Packaging and lead finish variations (LF designation) represent the primary differences between the main part and substitutes.

Parameter Comparison

Parameter	91900-21421 (Main)	91901-31421LF (Direct Substitute)	91900-21421LF (Parametric Equivalent)
Manufacturer	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)
Number of Positions	21	21	21
Pitch	0.039" (1.00mm)	0.039" (1.00mm)	0.039" (1.00mm)
Number of Rows	2	2	2
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Connector Type	Header, Center Strip Contacts	Header, Center Strip Contacts	Header, Center Strip Contacts
Contact Finish	Gold or Gold, GXT™	Gold or Gold, GXT™	Gold or Gold, GXT™
Contact Finish Thickness	15.0µin (0.38µm)	15.0µin (0.38µm)	15.0µin (0.38µm)
Mated Stacking Height	6mm	6mm	6mm
Height Above Board	0.107" (2.72mm)	0.107" (2.72mm)	0.107" (2.72mm)
Features	Solder Retention	Solder Retention	Solder Retention
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	RoHS Compliant	RoHS Compliant
REACH Status	Not specified	REACH Affected	REACH Affected
Packaging	Not specified	Tape & Reel (TR)	Tube

Engineering Selection Recommendations

91901-31421LF is the direct manufacturer substitute, offering active product status with RoHS and REACH compliance certifications. This part is supplied in Tape & Reel packaging, suitable for automated assembly processes. The LF designation indicates lead-free termination, aligning with modern environmental and regulatory requirements.

91900-21421LF is the parametric equivalent, maintaining identical electrical and mechanical specifications while providing active product status with equivalent compliance certifications. This part is supplied in Tube packaging, appropriate for manual assembly or lower-volume applications.

Both substitutes eliminate obsolescence risk while maintaining full functional and dimensional compatibility with the original 91900-21421 specification.

Frequently Asked Questions (FAQ)

Q: Can 91901-31421LF and 91900-21421LF be used interchangeably with 91900-21421?

A: Yes. Both substitutes maintain identical connector configuration (21 positions, 2 rows, 1.00mm pitch), mounting technology (surface mount), contact specifications (gold finish, 15.0µin thickness), and physical dimensions (6mm stacking height, 0.107" height above board). The primary differences are product status (active vs. obsolete), compliance certifications (RoHS/REACH), and packaging format.

Q: What is the difference between 91901-31421LF and 91900-21421LF?

A: Both parts are parametrically equivalent with identical electrical and mechanical specifications. The distinction lies in packaging: 91901-31421LF is supplied in Tape & Reel format for automated assembly, while 91900-21421LF is supplied in Tube format for manual assembly or lower-volume applications. Selection depends on production methodology and volume requirements.

Q: Does the LF designation affect compatibility?

A: The LF designation indicates lead-free termination, which is a manufacturing process change that does not affect electrical or mechanical compatibility. This designation reflects compliance with RoHS and REACH regulations and is compatible with standard reflow soldering processes.

Q: Are there any restrictions on substituting the obsolete 91900-21421?

A: No restrictions exist based on the provided specifications. Both active substitutes maintain full parametric equivalence across all critical electrical and mechanical parameters, MSL rating, and dimensional requirements. Compliance certifications (RoHS/REACH) on the substitutes represent an improvement over the obsolete part.

Q: Which substitute should be selected for new designs?

A: For new designs, either substitute is acceptable based on production requirements. Select 91901-31421LF for high-volume automated assembly (Tape & Reel packaging) or 91900-21421LF for manual assembly or lower-volume applications (Tube packaging). Both provide active product status and regulatory compliance.

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