M20-9751946 Equivalent & Substitute Parts

Part Overview

The M20-9751946 is a rectangular connector header manufactured by Harwin Inc., designed for through-hole, right-angle mounting with 19 positions at 0.100" (2.54mm) pitch. This connector is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The part serves board-to-board or cable connection applications with male pin contacts and push-pull fastening.

Key Parameters

Parameter	Value
Connector Type	Header, Through Hole, Right Angle
Number of Positions	19
Pitch - Mating	0.100" (2.54mm)
Contact Type	Male Pin
Mounting Type	Through Hole, Right Angle
Termination	Solder
Current Rating	3A per Contact
Operating Temperature	-40°C ~ 105°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the M20-9751946 is determined by strict alignment with the following electrical and mechanical parameters:

Connector Configuration: Header type, through-hole mounting, right-angle orientation, 19-position, single-row layout
Mating Interface: 0.100" (2.54mm) pitch with male pin contacts
Electrical Performance: 3A per contact current rating, operating temperature range -40°C ~ 105°C
Compliance Requirements: UL94 V-0 flammability rating, ROHS3 compliance, MSL 1 rating
Termination Method: Solder termination with push-pull fastening

The substitute part PREC019SBAN-M71RC from Sullins Connector Solutions meets all critical substitution criteria within allowable tolerances for contact dimensions and insulation material composition.

Parameter Comparison

Parameter	M20-9751946 (Harwin)	PREC019SBAN-M71RC (Sullins)	Compatibility
Connector Type	Header, Cuttable	Header, Breakaway	Compatible
Number of Positions	19	19	Identical
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	Identical
Contact Type	Male Pin	Male Pin	Identical
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Identical
Termination	Solder	Solder	Identical
Contact Length - Mating	0.228" (5.80mm)	0.230" (5.84mm)	Compatible
Contact Length - Post	0.118" (3.00mm)	0.120" (3.05mm)	Compatible
Insulation Height	0.100" (2.54mm)	0.098" (2.50mm)	Compatible
Contact Shape	Square	Square	Identical
Contact Finish - Mating	Tin	Tin	Identical
Contact Material	Brass	Brass	Identical
Insulation Material	Polyamide (PA6T), Nylon 6T	Polybutylene Terephthalate (PBT)	Compatible
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	Identical
Material Flammability Rating	UL94 V-0	UL94 V-0	Identical
Current Rating	3A per Contact	3A per Contact	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Obsolete	Active	Substitute is active

Engineering Selection Recommendations

The PREC019SBAN-M71RC from Sullins Connector Solutions is a direct functional equivalent for the obsolete M20-9751946. Both parts maintain identical electrical specifications, current ratings, and operating temperature ranges. Contact dimension variations (mating contact 0.228" vs. 0.230", post contact 0.118" vs. 0.120", insulation height 0.100" vs. 0.098") fall within standard manufacturing tolerances for 0.100" pitch connectors and do not affect mating compatibility or performance.

Both parts carry UL94 V-0 flammability certification, ROHS3 compliance, and MSL 1 moisture sensitivity ratings, ensuring equivalent environmental and regulatory performance. The primary material difference—polyamide (PA6T) versus polybutylene terephthalate (PBT)—represents a common industry substitution within the same connector class, with both materials meeting identical thermal and electrical requirements.

The substitute part's active product status provides supply chain continuity and ongoing manufacturer support, addressing the obsolescence of the original M20-9751946.

Frequently Asked Questions (FAQ)

Q: Are the contact dimension differences between M20-9751946 and PREC019SBAN-M71RC significant?

A: No. The variations in mating contact length (0.228" to 0.230"), post contact length (0.118" to 0.120"), and insulation height (0.100" to 0.098") are within standard manufacturing tolerances for 0.100" pitch rectangular connectors and do not affect mating interface compatibility or electrical performance.

Q: Does the insulation material change from polyamide to PBT affect performance?

A: No. Both polyamide (PA6T) and polybutylene terephthalate (PBT) are standard insulation materials for 0.100" pitch connectors. Both materials meet identical UL94 V-0 flammability requirements, operating temperature ranges (-40°C ~ 105°C), and moisture sensitivity specifications (MSL 1).

Q: Can PREC019SBAN-M71RC be used as a direct replacement in existing designs?

A: Yes. The PREC019SBAN-M71RC maintains identical electrical specifications (3A per contact), pitch (0.100"), position count (19), contact type (male pin), mounting method (through-hole, right-angle), and termination (solder). PCB footprints and mating connector designs require no modification.

Q: What is the difference between "Cuttable" and "Breakaway" connector types?

A: Both designations refer to headers that allow individual pins or pin groups to be separated from the main connector body. This feature does not affect electrical or mechanical compatibility when the full 19-position connector is used as specified.

Q: Are compliance certifications equivalent between the two parts?

A: Yes. Both M20-9751946 and PREC019SBAN-M71RC carry identical certifications: UL94 V-0 flammability rating, ROHS3 compliance, and MSL 1 moisture sensitivity level. REACH and ECCN classifications are also equivalent.

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