TE Connectivity 747303-1 D-Sub 37 Position Receptacle Equivalent & Substitute Parts

Part Overview

The TE Connectivity 747303-1 is a 37 position D-Sub receptacle connector with female sockets, designed for IDC ribbon cable termination in free hanging (in-line) mounting applications. This connector is part of the AMPLIMITE HDF-20 series and features a steel tin-plated shell with gold-plated contacts. The 747303-1 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility for new designs and ongoing production requirements.

Key Parameters

Parameter	Specification
Connector Style	D-Sub
Connector Type	Receptacle, Female Sockets
Number of Positions	37
Number of Rows	2
Shell Size, Connector Layout	4 (DC, C)
Termination Type	IDC, Ribbon Cable
Mounting Type	Free Hanging (In-Line)
Shell Material, Finish	Steel, Tin Plated
Contact Finish	Gold
Contact Finish Thickness	30.0µin (0.76µm)
Current Rating	1.25A
Operating Temperature Range	-55°C ~ 105°C
Material Flammability Rating	UL94 V-0
Contact Material	Phosphor Bronze
Dielectric Material	Thermoplastic
Features	Feed Through
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 747303-1 is determined by strict alignment of the following critical parameters:

Primary Compatibility Criteria:

Connector style: D-Sub
Connector type: Receptacle, Female Sockets
Number of positions: 37
Number of rows: 2
Shell size and layout: 4 (DC, C)
Termination method: IDC, Ribbon Cable
Contact type: Signal
Flange feature: Housing/Shell (Unthreaded)
Material flammability rating: UL94 V-0
Operating temperature range: -55°C ~ 105°C

Secondary Compatibility Considerations:

Mounting type: Free Hanging (In-Line) for direct replacement; Panel Mount variants available for alternative mounting configurations
Shell material and finish: Steel, Tin Plated (primary); alternative finishes available
Contact finish: Gold (maintained across all substitutes)
Current rating: 1.25A minimum (substitutes rated 1A to 5A are acceptable for applications within 1.25A specification)

Substitutes are grouped into two categories: direct functional equivalents with identical mounting type, and compatible alternatives with different mounting configurations that maintain electrical and mechanical compatibility.

Parameter Comparison

Parameter	747303-1 (Main)	1658612-1	8337-6000	8337-6003	8337-6009	L117DCFRA37S	L117DCFRAA37S	L117DCFRB37S	L117DCFRBA37S	L117DCFRCA37S
Manufacturer	TE Connectivity	TE Connectivity	3M	3M	3M	Amphenol ICC	Amphenol ICC	Amphenol ICC	Amphenol ICC	Amphenol ICC
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets
Number of Positions	37	37	37	37	37	37	37	37	37	37
Number of Rows	2	2	2	2	2	2	2	2	2	2
Shell Size, Connector Layout	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)	4 (DC, C)
Termination Type	IDC, Ribbon Cable	IDC, Ribbon Cable	IDC, Ribbon Cable	IDC, Ribbon Cable	IDC, Ribbon Cable	IDC, Ribbon Cable	IDC, Ribbon Cable	IDC, Ribbon Cable	IDC, Ribbon Cable	IDC, Ribbon Cable
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)	Panel Mount	Panel Mount	Panel Mount	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)
Shell Material, Finish	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Tin Plated	Steel, Nickel Plated	Plastic	Steel, Nickel Plated	Steel, Nickel Plated
Contact Finish	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Contact Finish Thickness	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	15.0µin (0.38µm)	15.0µin (0.38µm)	15.0µin (0.38µm)	15.0µin (0.38µm)	15.0µin (0.38µm)
Current Rating (Amps)	1.25A	1.25A	1A	1A	1A	3A	5A	3A	5A	5A
Operating Temperature Range	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-40°C ~ 125°C	-55°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Contact Material	Phosphor Bronze	Phosphor Bronze	Copper Alloy	Copper Alloy	Copper Alloy	Brass	Phosphor Bronze	Brass	Phosphor Bronze	Phosphor Bronze
Dielectric Material	Thermoplastic	Thermoplastic	PBT, Polyester, Glass Filled	PBT, Polyester, Glass Filled	PBT, Polyester, Glass Filled	Thermoplastic, Glass Filled	Thermoplastic, Glass Filled	Thermoplastic, Glass Filled	Thermoplastic, Glass Filled	Thermoplastic, Glass Filled
Features	Feed Through	Feed Through	Feed Through	Feed Through	Feed Through	Feed Through, Strain Relief	Feed Through, Strain Relief	Feed Through, Strain Relief	Feed Through, Strain Relief	Feed Through, Strain Relief
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant

Engineering Selection Recommendations

Direct Functional Equivalent (Recommended Primary Substitute):

The TE Connectivity 1658612-1 is the primary recommended substitute for the 747303-1. This part maintains identical electrical and mechanical specifications including 37 positions, 2 rows, free hanging in-line mounting, IDC ribbon cable termination, and operating temperature range of -55°C to 105°C. The 1658612-1 is active in production status and ROHS3 compliant, addressing the obsolescence and regulatory compliance limitations of the original 747303-1. Current rating is maintained at 1.25A with equivalent contact finish specifications.

Alternative Substitutes with Modified Mounting Configuration:

The 3M 8300 series connectors (8337-6000, 8337-6003, 8337-6009, 8337-8003) provide functional equivalents with panel mount configurations instead of free hanging in-line mounting. These parts maintain the 37 position, 2 row, IDC ribbon cable termination, and UL94 V-0 flammability rating. All 3M variants are active and RoHS compliant. Current rating is 1A, which is within the 1.25A specification of the original part. Panel mount variants are suitable for applications requiring fixed panel installation rather than in-line cable connection.

Amphenol ICC DFR Series Alternatives:

The Amphenol ICC L117DC series (L117DCFRA37S, L117DCFRAA37S, L117DCFRB37S, L117DCFRBA37S, L117DCFRCA37S) provides free hanging in-line mounting equivalents with enhanced current ratings (3A to 5A) and extended operating temperature ranges (up to -40°C to 125°C for certain variants). These parts are active and RoHS compliant. Variants differ in shell material finish (tin-plated steel, nickel-plated steel, or plastic) and flange features (unthreaded, screwlock, or cable-side configurations). Contact finish thickness is 15.0µin, which is thinner than the original 30.0µin specification but remains within acceptable gold plating standards.

Compliance Considerations:

All recommended substitutes are RoHS compliant, addressing the non-compliance status of the obsolete 747303-1. Selection between ROHS3 compliant (TE Connectivity 1658612-1 and 3M variants) and RoHS compliant (Amphenol ICC variants) depends on specific regulatory requirements of the application. All substitutes maintain UL94 V-0 flammability rating and are suitable for equivalent thermal environments.

Frequently Asked Questions (FAQ)

Q: Can the TE Connectivity 1658612-1 be used as a direct replacement for the 747303-1?

A: Yes. The 1658612-1 maintains identical connector specifications including 37 positions, 2 rows, free hanging in-line mounting, IDC ribbon cable termination, and operating temperature range. The primary advantage is active production status and ROHS3 compliance, addressing the obsolescence of the 747303-1.

Q: What is the difference between free hanging (in-line) and panel mount D-Sub connectors?

A: Free hanging (in-line) connectors are designed for direct cable connection without fixed panel mounting, allowing flexible positioning along the cable. Panel mount connectors are secured to a fixed panel or enclosure surface. The 747303-1 uses free hanging in-line mounting. The 3M 8300 series variants use panel mount configuration and require different installation methods.

Q: Are the Amphenol ICC L117DC series parts compatible with the 747303-1?

A: Yes, the L117DC series maintains electrical and mechanical compatibility for 37 position, 2 row, IDC ribbon cable termination with free hanging in-line mounting. Differences include higher current ratings (3A to 5A versus 1.25A), extended operating temperature ranges for certain variants, and thinner gold contact finish (15.0µin versus 30.0µin). These differences do not prevent functional substitution in applications operating within the 1.25A specification.

Q: What does RoHS compliance mean for connector selection?

A: RoHS (Restriction of Hazardous Substances) compliance indicates the connector meets regulatory requirements restricting lead, cadmium, mercury, and other hazardous materials. The original 747303-1 is RoHS non-compliant. All recommended substitutes are RoHS compliant or ROHS3 compliant, meeting current regulatory standards for new designs and production.

Q: Can I use a 3M 8337 series connector in place of the 747303-1?

A: The 3M 8337 series provides electrical compatibility for 37 position, 2 row, IDC ribbon cable termination with UL94 V-0 flammability rating. The primary difference is mounting type: 3M variants use panel mount configuration while the 747303-1 uses free hanging in-line mounting. Panel mount variants are suitable only for applications where fixed panel installation is acceptable. Current rating is 1A, which is within the 1.25A specification.

Q: What is the significance of contact finish thickness differences?

A: Contact finish thickness affects durability and wear resistance. The 747303-1 specifies 30.0µin (0.76µm) gold plating, while Amphenol ICC L117DC series specifies 15.0µin (0.38µm). Both thicknesses provide adequate gold plating for signal-level applications. Thinner plating may show slightly faster wear in high-cycle mating applications but remains acceptable for standard connector use.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. The 747303-1 has 654 pieces in stock. The 1658612-1 has 1238 pieces available, providing superior availability. The 3M 8337 series variants range from 829 to 1529 pieces in stock. Amphenol ICC L117DC series variants range from 787 to 1120 pieces in stock. Higher inventory levels support longer production runs and reduce lead time risk.

Q: What is the difference between the various Amphenol ICC L117DC part numbers?

A: The L117DC series variants differ in shell material finish, flange features, contact material, and operating temperature range. L117DCFRA37S uses steel tin-plated shell with unthreaded flange and brass contacts. L117DCFRAA37S uses steel nickel-plated shell with female screwlock (M3) and phosphor bronze contacts with extended temperature range. L117DCFRB37S uses plastic shell with unthreaded flange and brass contacts. L117DCFRBA37S uses steel nickel-plated shell with cable-side M3 screwlock and phosphor bronze contacts with extended temperature range. L117DCFRCA37S uses steel nickel-plated shell with mating-side 4-40 screwlock and phosphor bronze contacts with extended temperature range. Selection depends on specific mechanical mounting and environmental requirements.

Q: Is the 747303-1 still available for purchase?

A: The 747303-1 is classified as obsolete but 654 pieces are currently in stock. However, obsolete status indicates no future production. For new designs and ongoing production requirements, selection of an active substitute part is recommended to ensure long-term availability and compliance with current regulatory standards.

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