TE Connectivity 747051-1 D-Sub 37-Position Receptacle Connector: Equivalent & Substitute Parts

Part Overview

The TE Connectivity 747051-1 is a 37-position D-Sub receptacle connector with female sockets, designed for IDC ribbon cable termination in free-hanging inline applications. This connector is part of the AMPLIMITE HDF-20 series and features gold-plated phosphor bronze contacts rated for 1.25A at operating temperatures from -55°C to 105°C.

The 747051-1 is classified as obsolete. Locating equivalent and substitute components is necessary to support legacy system maintenance, repair, and continued field deployment where this connector type remains in use.

Substiute Parts

747051-1

TE Connectivity AMP ConnectorsIn Stock: 1211747051-1 Datasheet

Current PartRFQ

1658609-1

TE Connectivity AMP ConnectorsIn Stock: 9391658609-1 Datasheet

DirectRFQ

A-DFF 37 LPIII/Z

Assmann WSW ComponentsIn Stock: 6424A-DFF 37 LPIII/Z Datasheet

SimilarRFQ

A-DFF 37 LPIII/Z-UNC

Assmann WSW ComponentsIn Stock: 1994A-DFF 37 LPIII/Z-UNC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 747051-1 is determined by strict equivalence across the following critical parameters:

Core Compatibility Parameters:

• Connector style (D-Sub)
• Connector type (Receptacle, Female Sockets)
• Number of positions (37)
• Number of rows (2)
• Shell size and connector layout (4, DC, C)
• Mounting type (Free Hanging, In-Line)
• Termination method (IDC, Ribbon Cable)
• Flange feature (Housing/Shell with 4-40 threading)
• Feed-through capability
• Operating temperature range (-55°C to 105°C)
• Material flammability rating (UL94 V-0)

Acceptable Variations:

• Contact finish thickness (Flash or 30.0µin/0.76µm gold)
• Current rating (equal to or greater than 1.25A)
• Voltage rating (equal to or greater than specified)
• Shell material composition (steel or phosphor bronze base)
• Dielectric material (thermoplastic or glass-filled PBT)
• Contact material (phosphor bronze or copper alloy)
• Wire gauge compatibility (26-28 AWG)
• Product status (active substitutes preferred for obsolete originals)
• RoHS compliance status

Substitutes must maintain identical mechanical fit, electrical performance within or above rated specifications, and functional compatibility with IDC ribbon cable assemblies designed for the 747051-1.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TE Connectivity 1658609-1

The 1658609-1 is the direct equivalent substitute for the 747051-1. Both connectors are manufactured by TE Connectivity within the AMPLIMITE HDF-20 series and share identical electrical and mechanical specifications. The 1658609-1 is currently in active production status, whereas the 747051-1 is obsolete. The 1658609-1 carries ROHS3 compliance, addressing regulatory requirements for new designs and system updates. Wire gauge specification (26-28 AWG, stranded or solid) is explicitly documented for the 1658609-1, providing clarity for ribbon cable assembly compatibility. Current inventory of 908 pieces supports immediate procurement for replacement applications.

Secondary Substitutes: Assmann WSW A-DFF 37 LPIII/Z and A-DFF 37 LPIII/Z-UNC

Both Assmann WSW components provide functional equivalence with enhanced electrical performance. These connectors maintain the required 37-position, 2-row D-Sub configuration with 4-40 flange threading (A-DFF 37 LPIII/Z-UNC) or unthreaded housing (A-DFF 37 LPIII/Z). Both are rated for 3A current, exceeding the 1.25A specification of the 747051-1, and include 250V voltage rating. Both incorporate strain relief features and are ROHS3 compliant with REACH unaffected status. The A-DFF 37 LPIII/Z-UNC is the preferred Assmann alternative when 4-40 flange threading is required to match the 747051-1 mounting interface. The A-DFF 37 LPIII/Z provides an alternative for applications where unthreaded housing is acceptable. Both are available in active production with substantial inventory (6335 and 1957 pieces respectively).

Selection Criteria:

For direct replacement in existing systems designed for the 747051-1, use TE Connectivity 1658609-1. For new designs or system upgrades requiring enhanced electrical performance and modern compliance certifications, either the 1658609-1 or A-DFF 37 LPIII/Z-UNC are suitable. The Assmann WSW A-DFF 37 LPIII/Z-UNC provides identical flange threading compatibility with additional current capacity and voltage rating. All three substitutes maintain the critical feed-through capability, IDC ribbon cable termination, and -55°C to 105°C operating temperature range required for legacy system support.

Frequently Asked Questions (FAQ)

Q: Can the 1658609-1 be used as a direct replacement for the 747051-1 in existing assemblies?

A: Yes. The 1658609-1 is a direct equivalent. Both connectors share identical specifications for connector style, type, position count, row configuration, shell size, mounting type, termination method, flange feature, and operating temperature range. The 1658609-1 is the recommended substitute for the obsolete 747051-1.

Q: What is the difference between the TE Connectivity 1658609-1 and the Assmann WSW A-DFF 37 LPIII/Z-UNC?

A: Both connectors are mechanically and electrically compatible with the 747051-1. The primary differences are manufacturer, shell material composition, and electrical ratings. The 1658609-1 uses phosphor bronze contacts with 1.25A rating. The A-DFF 37 LPIII/Z-UNC uses copper alloy contacts with 3A rating and includes 250V voltage specification. The A-DFF 37 LPIII/Z-UNC features strain relief, whereas the 1658609-1 does not. Both maintain 4-40 flange threading and are ROHS3 compliant.

Q: Is the A-DFF 37 LPIII/Z (unthreaded) compatible with the 747051-1?

A: The A-DFF 37 LPIII/Z is functionally equivalent in all electrical and termination specifications. However, it features unthreaded housing, whereas the 747051-1 has 4-40 threaded flange. If the mounting interface requires 4-40 threading, use the A-DFF 37 LPIII/Z-UNC instead. If the application permits unthreaded housing, the A-DFF 37 LPIII/Z is a valid substitute.

Q: What wire gauge is compatible with these connectors?

A: All substitute connectors support 26-28 AWG wire gauge for IDC ribbon cable termination. The 1658609-1 explicitly specifies compatibility with both stranded and solid conductors in this gauge range. The Assmann WSW connectors specify 26-28 AWG without distinction between stranded and solid types.

Q: Are all substitute parts RoHS compliant?

A: The 747051-1 is RoHS non-compliant. All three substitute parts (1658609-1, A-DFF 37 LPIII/Z, and A-DFF 37 LPIII/Z-UNC) are ROHS3 compliant. If RoHS compliance is required for your application, any of the three substitutes are suitable.

Q: What is the current rating difference between the 747051-1 and the Assmann substitutes?

A: The 747051-1 and 1658609-1 are both rated for 1.25A. The Assmann WSW A-DFF 37 LPIII/Z and A-DFF 37 LPIII/Z-UNC are rated for 3A. The higher rating of the Assmann connectors provides additional margin for applications with higher current demands, though they remain compatible with systems designed for 1.25A operation.

Q: Can I use the A-DFF 37 LPIII/Z-UNC in place of the 747051-1 without any modifications?

A: Yes. The A-DFF 37 LPIII/Z-UNC maintains identical mechanical fit with 4-40 flange threading, identical connector configuration (37 positions, 2 rows, shell size 4), and identical termination method (IDC ribbon cable). No modifications to the mounting interface or cable assembly are required.

Q: What is the difference between flash gold plating and 30.0µin gold plating?

A: Both provide gold contact finish for corrosion resistance and electrical conductivity. The 747051-1 and 1658609-1 specify 30.0µin (0.76µm) thickness. The Assmann WSW connectors specify flash thickness, which is a thinner gold layer. Both thicknesses are suitable for the specified current ratings and operating conditions.

Q: Are there any packaging differences between these connectors?

A: The 747051-1 packaging is not specified. The 1658609-1 is supplied in bulk packaging. The Assmann WSW A-DFF 37 LPIII/Z and A-DFF 37 LPIII/Z-UNC are supplied in tray packaging. Packaging differences do not affect connector performance or compatibility; they relate only to order quantity and handling.