D37P91C6PI9C Equivalent & Substitute Parts Reference

Part Overview

The D37P91C6PI9C is a 37-position D-Sub plug connector with male pins manufactured by Amphenol ICC (FCI) in the Delta D series. This through-hole mounted connector features press-fit termination, tin-plated steel shell, and gold-plated contacts rated for 5A at 300V across an operating temperature range of -55°C to 125°C. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations.

Key Parameters

Parameter	Value
Connector Type	Plug, Male Pins
Number of Positions	37
Shell Size / Layout	4 (DC, C)
Mounting Type	Through Hole
Termination	Press-Fit
Shell Material / Finish	Steel, Tin Plated
Contact Finish	Gold
Current Rating	5A
Voltage Rating	300V
Operating Temperature	-55°C to 125°C
Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution for the D37P91C6PI9C is determined by strict alignment with the following electrical and mechanical parameters:

Direct Equivalents (Plug, Male Pins Configuration):

Connector type: Plug with male pins
Position count: 37
Shell size: 4 (DC, C)
Mounting: Through hole
Termination: Press-fit
Operating temperature: -55°C to 125°C
Flammability: UL94 V-0

Mating Receptacle Alternatives (Receptacle, Female Sockets Configuration):

Connector type: Receptacle with female sockets
Position count: 37
Shell size: 4 (DC, C)
Mounting: Through hole
Termination: Press-fit
Operating temperature: -55°C to 125°C
Flammability: UL94 V-0

These parameters define functional compatibility within D-Sub 37-position connector systems. Variations in flange features, contact finish thickness, and shell material finish do not prevent substitution when core electrical and mechanical specifications align.

Parameter Comparison

Part Number	Manufacturer	Connector Type	Positions	Shell Size	Mounting	Termination	Shell Finish	Contact Finish	Current (A)	Voltage (V)	Temp Range (°C)	Status	RoHS
D37P91C6PI9C	Amphenol ICC (FCI)	Plug, Male Pins	37	4 (DC, C)	Through Hole	Press-Fit	Steel, Tin	Gold	5	300	-55 to 125	Obsolete	Non-compliant
D37P91C6PI9CLF	Amphenol ICC (FCI)	Plug, Male Pins	37	4 (DC, C)	Through Hole	Press-Fit	Steel, Tin	Gold	5	300	-55 to 125	Active	Compliant
5788458-1	TE Connectivity AMP	Plug, Male Pins	37	4 (DC, C)	Through Hole	Press-Fit	Steel, Tin	Gold	—	—	—	Active	Compliant
191-037-123R001	NorComp Inc.	Plug, Male Pins	37	4 (DC, C)	Panel Mount	Press-Fit	Steel, Nickel	Gold	5	—	-55 to 125	Active	Compliant
L17TF3700112	Amphenol ICC (Commercial)	Receptacle, Female Sockets	37	4 (DC, C)	Through Hole	Press-Fit	Steel, Tin	Gold	3	300	-55 to 125	Active	Compliant
L17TF3701100	Amphenol ICC (Commercial)	Receptacle, Female Sockets	37	4 (DC, C)	Through Hole	Press-Fit	Steel, Tin	Gold	3	300	-55 to 125	Active	Compliant
L17TF3701101	Amphenol ICC (Commercial)	Receptacle, Female Sockets	37	4 (DC, C)	Through Hole	Press-Fit	Steel, Tin	Gold	3	300	-55 to 125	Active	Compliant
L17TF3701102	Amphenol ICC (Commercial)	Receptacle, Female Sockets	37	4 (DC, C)	Through Hole	Press-Fit	Steel, Tin	Gold	3	300	-55 to 125	Active	Compliant
L17TF3701104	Amphenol ICC (Commercial)	Receptacle, Female Sockets	37	4 (DC, C)	Through Hole	Press-Fit	Steel, Tin	Gold	3	300	-55 to 125	Active	Compliant
L17TF3701105	Amphenol ICC (Commercial)	Receptacle, Female Sockets	37	4 (DC, C)	Through Hole	Press-Fit	Steel, Tin	Gold	3	300	-55 to 125	Active	Compliant
L17TF3701111	Amphenol ICC (Commercial)	Receptacle, Female Sockets	37	4 (DC, C)	Through Hole	Press-Fit	Steel, Tin	Gold	3	300	-55 to 125	Active	Compliant

Engineering Selection Recommendations

For Direct Plug Replacement (Same Connector Type):

D37P91C6PI9CLF is the primary direct equivalent. It maintains identical electrical and mechanical specifications to the obsolete D37P91C6PI9C while offering active product status and RoHS compliance. This part is recommended for applications requiring a direct form-fit-function replacement with current manufacturing support.

5788458-1 (TE Connectivity AMPLIMITE HD-20 series) provides an alternative plug configuration from an established connector manufacturer. While electrical ratings are not specified in available documentation, the part shares core mechanical parameters: 37-position, shell size 4, through-hole mounting, and press-fit termination. This part carries ROHS3 compliance and active status.

191-037-123R001 (NorComp Inc.) is a panel-mount variant rather than through-hole. This configuration difference makes it unsuitable for direct replacement in through-hole applications. Selection of this part requires design modification to accommodate panel mounting geometry.

For Receptacle Pairing (Mating Connector Selection):

The L17TF37 series receptacles (L17TF3700112, L17TF3701100, L17TF3701101, L17TF3701102, L17TF3701104, L17TF3701105, L17TF3701111) are active, RoHS-compliant female socket connectors that mate with 37-position D-Sub plugs. These parts maintain the same shell size, mounting type, and termination method as the main part. Current rating is 3A versus 5A for the plug; voltage rating and operating temperature range align at 300V and -55°C to 125°C. Flange feature variations (housing/shell unthreaded, M3, 4-40 threaded) determine specific mounting configurations but do not affect electrical compatibility.

Compliance Considerations:

The original D37P91C6PI9C is RoHS non-compliant and obsolete. All recommended substitutes carry either RoHS or ROHS3 compliance, meeting current regulatory requirements for new designs and procurement.

Frequently Asked Questions (FAQ)

Q: Can D37P91C6PI9CLF directly replace D37P91C6PI9C in existing assemblies?

A: Yes. D37P91C6PI9CLF is electrically and mechanically identical to the obsolete part. Both are 37-position D-Sub plugs with through-hole press-fit termination, 5A current rating, 300V voltage rating, and -55°C to 125°C operating range. The primary difference is product status (active vs. obsolete) and RoHS compliance.

Q: What is the difference between plug and receptacle connectors in this series?

A: Plugs (male pins) and receptacles (female sockets) are complementary connector types that mate together. The D37P91C6PI9C is a plug; the L17TF37 series are receptacles. Both types are required to form a complete mated pair connection. They share identical shell size, position count, and mounting specifications.

Q: Why do receptacle parts show 3A current rating while the plug shows 5A?

A: Current rating differences reflect the contact design and material specifications of each connector type. Both ratings are provided by manufacturers based on contact geometry and material properties. System current capacity is determined by the lower rating in a mated pair.

Q: Can 191-037-123R001 replace D37P91C6PI9C?

A: No. While both are 37-position D-Sub plugs with identical shell size and press-fit termination, 191-037-123R001 is panel-mount configured, whereas D37P91C6PI9C is through-hole. Mounting type determines PCB installation method and cannot be interchanged without design modification.

Q: What does RoHS compliance mean for connector selection?

A: RoHS (Restriction of Hazardous Substances) compliance indicates the part meets regulatory requirements restricting lead, cadmium, mercury, and other hazardous materials. Current designs and procurement typically require RoHS or ROHS3 compliant parts. The obsolete D37P91C6PI9C is non-compliant; all active substitutes listed are compliant.

Q: Are there packaging differences between substitute parts?

A: Yes. D37P91C6PI9CLF is supplied in trays; 5788458-1 is supplied in bulk. Packaging affects handling, storage, and ordering quantities but does not affect electrical or mechanical performance. Verify packaging requirements with procurement specifications.

Q: Can L17TF3701102 and L17TF3701104 be used interchangeably?

A: Both are 37-position receptacles with identical electrical specifications. The difference is flange feature: L17TF3701102 has mating-side female screwlock (4-40), while L17TF3701104 has housing/shell (M3). Selection depends on the specific mounting interface required in your application. They are not interchangeable if flange geometry is constrained.

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