Amphenol ICC 73305-121 Modular Jack Connector - Equivalent & Substitute Parts

Part Overview

The Amphenol ICC 73305-121 is a modular jack connector with 6 positions and 6 contacts (6p6c), configured for RJ11, RJ12, RJ14, and RJ25 applications. This surface-mount connector features a 90° right-angle orientation, unshielded design, and solder termination with Cat3 ratings. The part is currently obsolete, making identification of suitable substitutes essential for ongoing system maintenance and new designs requiring compatible connectivity solutions.

Substiute Parts

73305-121

Amphenol ICC (FCI)In Stock: 99973305-121 Datasheet

Current PartRFQ

73305-121LF

Amphenol ICC (FCI)In Stock: 76273305-121LF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 73305-121 is determined by strict equivalence across the following critical parameters:

• Connector type: Jack configuration
• Contact count: 6 positions, 6 contacts (6p6c)
• RJ standard compatibility: RJ11, RJ12, RJ14, RJ25
• Mounting method: Surface mount
• Physical orientation: 90° right-angle
• Termination method: Solder
• Electrical shielding: Unshielded
• Performance rating: Cat3
• Operating temperature range: -25°C to 70°C
• Contact material composition: Phosphor Bronze
• Contact finish specification: Gold, GXT™

The 73305-121LF meets all these criteria and is therefore a direct functional equivalent. Differences in housing material and product status do not affect electrical or mechanical compatibility for applications requiring this connector specification.

Parameter Comparison

Engineering Selection Recommendations

The 73305-121LF is the direct substitute for the obsolete 73305-121. Both parts share identical electrical and mechanical specifications across all functional parameters. The primary distinctions are:

Product Status: The 73305-121LF is active and available, whereas the 73305-121 is obsolete. For new designs and ongoing procurement, the 73305-121LF is the appropriate selection.

RoHS Compliance: The 73305-121LF meets RoHS compliance requirements, while the 73305-121 does not. Applications subject to RoHS regulations require the 73305-121LF.

Housing Material: The 73305-121LF uses Polycyclohexylenedimethylene Terephthalate (PCT) housing, compared to Polyamide (PA) Nylon in the original part. Both materials are suitable for the specified operating temperature range and environmental conditions.

Packaging: The 73305-121LF is supplied in tube packaging, whereas the original part packaging is unspecified. This affects handling and storage but does not impact functional performance.

Frequently Asked Questions (FAQ)

Q: Can the 73305-121LF be used as a direct replacement for the 73305-121 in existing designs?

A: Yes. The 73305-121LF is electrically and mechanically equivalent. All contact configurations, termination methods, orientation, and performance ratings are identical. The connector will function identically in applications designed for the 73305-121.

Q: What is the difference between the housing materials, and does it affect performance?

A: The 73305-121 uses Polyamide (PA) Nylon housing, while the 73305-121LF uses Polycyclohexylenedimethylene Terephthalate (PCT). Both materials operate within the specified temperature range of -25°C to 70°C. PCT offers improved dimensional stability and chemical resistance. The material change does not affect electrical performance or mechanical compatibility.

Q: Why is RoHS compliance important for the 73305-121LF?

A: RoHS compliance indicates the part meets restrictions on hazardous substances. The 73305-121LF is RoHS compliant, making it suitable for applications and markets with RoHS requirements. The original 73305-121 is non-compliant and may not be acceptable for regulated applications.

Q: Are there any compatibility concerns with the different packaging formats?

A: No. The 73305-121LF is supplied in tube packaging for handling and storage purposes. This does not affect the connector's electrical or mechanical performance. Packaging differences are logistical only and do not impact circuit integration or functionality.

Q: What RJ standards does this connector support?

A: The 73305-121 and 73305-121LF both support RJ11, RJ12, RJ14, and RJ25 standards. These are 6-position, 6-contact modular connector configurations used in telecommunications and data applications.

Q: Is the 73305-121 still available for purchase?

A: The 73305-121 is obsolete. The 73305-121LF is the active equivalent and is the recommended part for procurement. Existing inventory of the 73305-121 may be available through component distributors, but new designs should specify the 73305-121LF.