RASM742TR Equivalent & Substitute Parts

Part Overview

The RASM742TR is a power barrel connector jack manufactured by Switchcraft Inc., designed for surface mount, right-angle applications with 1.05mm ID (0.041") and 4.60mm OD (0.138") mating dimensions. This connector features 2 conductors and 3 contacts with a single normally closed internal switch, rated for 3A current capacity with silver-plated copper alloy contacts and thermoplastic housing.

The RASM742TR is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or repair requirements for systems utilizing this connector specification.

Key Parameters

Parameter	Value
Connector Type	Jack
Gender	Male
Mating Diameter (ID)	1.05mm (0.041")
Mating Diameter (OD)	4.60mm (0.138")
Number of Contacts	3 Contacts, 2 Conductors
Internal Switch	Single Switch, Normally Closed
Mounting Type	Surface Mount, Right Angle
Termination	Solder
Current Rating	3 A
Contact Material	Copper Alloy with Silver Plating
Housing Material	Thermoplastic
Body Color	Black

Substitute Part Grouping Explanation

Substitution eligibility for the RASM742TR is determined by strict equivalence across the following critical parameters:

Connector type (Jack) and gender (Male)
Mating diameter specifications: 1.05mm ID and 4.60mm OD
Contact configuration: 3 contacts with 2 conductors
Internal switch function: Single switch, normally closed
Mounting configuration: Surface mount, right angle orientation
Termination method: Solder
Current rating: 3 A minimum
Contact material composition and plating
Housing material: Thermoplastic

Parts meeting all these criteria are classified as direct functional equivalents. Variations in packaging format, product status, or compliance certifications do not affect electrical or mechanical compatibility.

Parameter Comparison

Parameter	RASM742TR	RASM742TRX
Manufacturer	Switchcraft Inc.	Switchcraft Inc.
Connector Type	Jack	Jack
Gender	Male	Male
Mating Diameter (ID)	1.05mm (0.041")	1.05mm (0.041")
Mating Diameter (OD)	4.60mm (0.138")	4.60mm (0.138")
Actual Diameter (ID)	0.039" (1.00mm)	0.039" (1.00mm)
Actual Diameter (OD)	0.154" (3.90mm)	0.154" (3.90mm)
Number of Contacts	3 Contacts, 2 Conductors	3 Contacts, 2 Conductors
Internal Switch	Single Switch, Normally Closed	Single Switch, Normally Closed
Mounting Type	Surface Mount, Right Angle	Surface Mount, Right Angle
Termination	Solder	Solder
Current Rating	3 A	3 A
Contact Material - Plating	Silver	Silver
Contact Material	Copper Alloy	Copper Alloy
Housing Material	Thermoplastic	Thermoplastic
Body Color	Black	Black
Shielding	Unshielded	Unshielded
Product Status	Obsolete	Active
Packaging	Standard	Tape & Reel (TR)
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The RASM742TRX is a direct functional equivalent to the RASM742TR. Both parts share identical electrical and mechanical specifications across all critical parameters including connector type, mating dimensions, contact configuration, switching function, mounting orientation, and current rating.

The primary distinction between these parts is product status and compliance posture. The RASM742TR is classified as obsolete, while the RASM742TRX maintains active product status with ROHS3 compliance certification. The RASM742TRX is supplied in Tape & Reel packaging format, which is standard for high-volume manufacturing environments.

For new designs or ongoing production requiring this connector specification, the RASM742TRX is the appropriate selection. For legacy system support or repair applications where the original RASM742TR is required, the RASM742TRX provides full electrical and mechanical compatibility with the added benefit of current availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can RASM742TRX be used as a direct replacement for RASM742TR in existing designs?

A: Yes. The RASM742TRX is electrically and mechanically identical to the RASM742TR across all functional parameters. Both connectors feature the same 1.05mm ID / 4.60mm OD mating dimensions, 3-contact configuration with single normally closed switch, 3A current rating, and surface mount right-angle termination. No design modifications are required.

Q: What is the difference between RASM742TR and RASM742TRX?

A: The primary differences are product status and packaging. RASM742TR is obsolete and supplied in standard packaging, while RASM742TRX is an active product supplied in Tape & Reel format. Additionally, RASM742TRX carries ROHS3 compliance certification, whereas RASM742TR is RoHS non-compliant. All electrical and mechanical specifications are identical.

Q: Does the Tape & Reel packaging of RASM742TRX affect compatibility?

A: No. Tape & Reel packaging is a supply format used for automated assembly processes. It does not affect the connector's electrical performance, mechanical fit, or functional characteristics. The connector itself is identical regardless of packaging format.

Q: Are there any compliance considerations when switching from RASM742TR to RASM742TRX?

A: The RASM742TRX is ROHS3 compliant, while the RASM742TR is RoHS non-compliant. If your application or market requires RoHS compliance, the RASM742TRX satisfies this requirement. Both parts are REACH Unaffected and classified under ECCN EAR99.

Q: What is the current inventory status for these parts?

A: RASM742TR has 708 pieces in stock as new original inventory. RASM742TRX has 2147 pieces in stock as new original inventory. Availability should be confirmed with your supplier for current requirements.

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