DF7-9P-3.96DS(25) Equivalent & Substitute Parts

Part Overview

The DF7-9P-3.96DS(25) is a rectangular connector header manufactured by Hirose Electric Co Ltd, designed for through-hole, right-angle board-to-cable/wire applications. This 9-position connector operates at 0.156" (3.96mm) pitch with shrouded 4-wall construction and solder termination. The product is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	9
Pitch - Mating	0.156" (3.96mm)
Mounting Type	Through Hole, Right Angle
Shrouding	Shrouded - 4 Wall
Termination	Solder
Contact Material	Copper Alloy
Contact Finish	Tin
Insulation Material	Polyamide (PA), Nylon, Glass Filled
Operating Temperature Range	-35°C ~ 85°C
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution eligibility for the DF7-9P-3.96DS(25) is determined by the following critical parameters:

Connector Type & Contact Type: Must be Header with Male Pin configuration
Position Count & Pitch: Must maintain 9 positions at 0.156" (3.96mm) mating pitch
Mounting & Orientation: Must support through-hole, right-angle mounting
Shrouding Configuration: Must provide shrouded 4-wall construction
Termination Method: Must use solder termination
Contact Material & Finish: Copper alloy with tin finish required
Insulation Properties: Glass-filled thermoplastic or polyamide acceptable
Flammability Compliance: UL94 V-0 rating mandatory

The substitute part 2-647126-9 (TE Connectivity AMP Connectors, MTA-156 series) meets all critical substitution criteria while offering active product status and enhanced operating temperature range.

Parameter Comparison

Parameter	DF7-9P-3.96DS(25) (Hirose)	2-647126-9 (TE Connectivity)	Compatibility
Connector Type	Header	Header	Match
Contact Type	Male Pin	Male Pin	Match
Number of Positions	9	9	Match
Pitch - Mating	0.156" (3.96mm)	0.156" (3.96mm)	Match
Number of Rows	1	1	Match
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Match
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Match
Termination	Solder	Solder	Match
Contact Material	Copper Alloy	Copper Alloy	Match
Contact Finish - Mating	Tin	Tin	Match
Contact Finish - Post	Tin	Tin	Match
Insulation Material	Polyamide (PA), Nylon, Glass Filled	Thermoplastic, Glass Filled	Compatible
Material Flammability Rating	UL94 V-0	UL94 V-0	Match
Operating Temperature Range	-35°C ~ 85°C	-55°C ~ 105°C	Substitute exceeds range
Product Status	Obsolete	Active	Substitute is current

Engineering Selection Recommendations

The 2-647126-9 (TE Connectivity MTA-156 series) is a direct functional equivalent for the obsolete DF7-9P-3.96DS(25). Selection rationale is based on the following factors:

Product Status: The substitute maintains active product status, ensuring long-term availability and supply chain continuity compared to the obsolete original part.
Compliance & Certification: Both parts meet UL94 V-0 flammability requirements. The substitute carries RoHS Compliance certification, providing additional regulatory alignment for modern applications.
Electrical & Mechanical Compatibility: All critical parameters—connector type, position count, pitch, mounting configuration, shrouding, and termination method—are identical between the original and substitute.
Operating Envelope: The substitute's extended operating temperature range (-55°C ~ 105°C) encompasses the original specification (-35°C ~ 85°C), providing broader application flexibility without thermal derating concerns.
Contact Geometry & Finish: Tin-plated copper alloy contacts with matching mating and post finishes ensure electrical performance equivalence.

Frequently Asked Questions (FAQ)

Q: Can the 2-647126-9 be used as a direct replacement for the DF7-9P-3.96DS(25)?

A: Yes. Both connectors share identical mating pitch (0.156"), position count (9), mounting type (through-hole right-angle), shrouding configuration (4-wall), and termination method (solder). Mechanical and electrical compatibility is confirmed across all critical parameters.

Q: What are the key differences between these two connectors?

A: The primary differences are product status (obsolete vs. active), operating temperature range (DF7 operates -35°C to 85°C; 2-647126-9 operates -55°C to 105°C), insulation material composition (polyamide vs. thermoplastic), and fastening mechanism (latch holder vs. friction lock). The substitute's extended temperature range and active status are advantages for new designs.

Q: Are there any physical dimension concerns when substituting?

A: Contact length and insulation height differ slightly between the two parts. The DF7-9P-3.96DS(25) has a mating contact length of 0.276" (7.00mm) and insulation height of 0.303" (7.70mm), while the 2-647126-9 has a mating contact length of 0.300" (7.62mm) and insulation height of 0.455" (11.56mm). These dimensional variations must be verified against PCB layout and mating connector specifications before implementation.

Q: Does the substitute meet the same compliance standards?

A: Both connectors meet UL94 V-0 flammability requirements. The substitute (2-647126-9) additionally carries RoHS Compliance certification. Both are classified as REACH Unaffected or Vendor Undefined, with matching ECCN (EAR99) and HTSUS (8536.69.4040) classifications.

Q: What is the fastening mechanism difference?

A: The original DF7-9P-3.96DS(25) uses a latch holder fastening type, while the substitute 2-647126-9 uses friction lock. This difference affects mating force and connector retention characteristics and should be evaluated against application requirements.

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