HTST-120-04-T-D-RA Equivalent & Substitute Parts

Part Overview

The HTST-120-04-T-D-RA is a rectangular connector header manufactured by Samtec Inc., designed for through-hole, right-angle board-to-cable/wire applications. This 40-position connector operates at 0.100" (2.54mm) pitch with a 2-row configuration and features shrouded 4-wall construction with push-pull fastening. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified to support design flexibility, inventory optimization, and supply chain continuity while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	40
Number of Rows	2
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle
Shrouding	Shrouded - 4 Wall
Termination	Solder
Fastening Type	Push-Pull
Contact Shape	Square
Material Flammability Rating	UL94 V-0
Operating Temperature	-55°C ~ 105°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts are grouped based on strict alignment with the following critical parameters:

Primary Compatibility Criteria:

Connector Type: Header
Contact Type: Male Pin
Pitch - Mating: 0.100" (2.54mm)
Number of Positions: 40
Number of Rows: 2
Row Spacing - Mating: 0.100" (2.54mm)
Mounting Type: Through Hole, Right Angle
Shrouding: Shrouded - 4 Wall
Termination: Solder
Contact Shape: Square
Material Flammability Rating: UL94 V-0

Group 1 - Direct Right-Angle Equivalents (Fastening Type: Push-Pull):

HTST-120-04-T-D-RA (Samtec Inc.) - Main Part
09185406924 (HARTING) - Through Hole vertical mounting; differs in mounting orientation
75867-107LF (Amphenol ICC/FCI) - Right-angle, push-pull fastening
75867-307LF (Amphenol ICC/FCI) - Right-angle, push-pull fastening
HIF3FC-40PA-2.54DS(71) (Hirose Electric Co Ltd) - Right-angle, push-pull fastening

Group 2 - Right-Angle with Latch Holder Fastening:

09185406323 (HARTING) - Right-angle, latch holder fastening
09185407323 (HARTING) - Right-angle, latch holder fastening

Group 3 - Right-Angle with Alternative Fastening:

3-1761605-3 (TE Connectivity AMP Connectors) - Right-angle, push-pull fastening

Substitution is valid when the application accommodates differences in contact finish, insulation material, operating temperature range, and fastening mechanism while maintaining the core electrical and mechanical interface.

Parameter Comparison

Parameter	HTST-120-04-T-D-RA (Samtec)	09185406323 (HARTING)	09185406924 (HARTING)	09185407323 (HARTING)	3-1761605-3 (TE Connectivity)	75867-107LF (Amphenol ICC)	75867-307LF (Amphenol ICC)	HIF3FC-40PA-2.54DS(71) (Hirose)
Connector Type	Header	Header	Header	Header	Header	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Positions	40	40	40	40	40	40	40	40
Number of Rows	2	2	2	2	2	2	2	2
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Fastening Type	Push-Pull	Latch Holder	Push-Pull	Latch Holder	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Contact Length - Mating	0.250" (6.35mm)	0.242" (6.15mm)	0.240" (6.10mm)	0.242" (6.15mm)	0.240" (6.10mm)	0.236" (6.00mm)	0.236" (6.00mm)	0.236" (6.00mm)
Contact Length - Post	0.130" (3.30mm)	0.114" (2.90mm)	0.114" (2.90mm)	0.114" (2.90mm)	0.102" (2.60mm)	0.120" (3.05mm)	0.120" (3.05mm)	0.118" (3.00mm)
Insulation Height	0.365" (9.27mm)	0.366" (9.30mm)	0.681" (17.30mm)	0.366" (9.30mm)	0.350" (8.89mm)	0.362" (9.20mm)	0.362" (9.20mm)	0.335" (8.51mm)
Contact Shape	Square	Square	Square	Square	Square	Square	Square	Square
Contact Finish - Mating	Tin	Gold	Gold	Gold	Gold	Gold, GXT™	Gold, GXT™	Gold
Contact Material	Phosphor Bronze	Copper Alloy	Copper Alloy	Copper Alloy	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Brass
Insulation Material	Liquid Crystal Polymer (LCP)	Polybutylene Terephthalate (PBT), Glass Filled	Polybutylene Terephthalate (PBT), Glass Filled	Polybutylene Terephthalate (PBT), Glass Filled	Polybutylene Terephthalate (PBT)	Thermoplastic, Glass Filled	Thermoplastic, Glass Filled	Polybutylene Terephthalate (PBT)
Operating Temperature	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-65°C ~ 105°C	Not Specified	Not Specified	-55°C ~ 85°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
Current Rating (Amps)	3.4A per Contact	Not Specified	Not Specified	Not Specified	1A per Contact	Not Specified	Not Specified	1A
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and comply with ROHS3 or RoHS standards, ensuring regulatory compliance and long-term availability. Selection between the main part and substitutes depends on application-specific requirements:

For Push-Pull Fastening Applications: The HTST-120-04-T-D-RA, 09185406924, 75867-107LF, 75867-307LF, 3-1761605-3, and HIF3FC-40PA-2.54DS(71) are functionally equivalent in fastening mechanism. The HTST-120-04-T-D-RA offers the highest current rating at 3.4A per contact and operates to 105°C. The 3-1761605-3 operates to 105°C with 1A per contact rating. The HIF3FC-40PA-2.54DS(71) operates to 85°C with 1A per contact rating.

For Latch Holder Fastening Applications: The 09185406323 and 09185407323 provide latch holder fastening with extended operating temperature to 125°C. These parts are suitable where push-pull fastening is not required and higher temperature operation is beneficial.

For Vertical Mounting: The 09185406924 is configured for through-hole vertical mounting rather than right-angle, making it suitable for applications requiring vertical board-to-cable orientation.

Contact Finish Considerations: The main part features tin contact finish on mating surfaces. All substitute parts except the main part feature gold contact finish on mating surfaces, which may provide enhanced corrosion resistance in specific environments.

Insulation Material Variations: The main part uses Liquid Crystal Polymer (LCP) insulation. Substitute parts employ Polybutylene Terephthalate (PBT) or thermoplastic materials, which may affect mechanical and thermal properties in specific applications.

Frequently Asked Questions (FAQ)

Q: Can I substitute 09185406924 for HTST-120-04-T-D-RA in my design?

A: The 09185406924 shares the same pitch, position count, row configuration, and shrouding. However, it is configured for through-hole vertical mounting rather than right-angle mounting. Substitution is valid only if your PCB layout accommodates vertical connector orientation.

Q: What is the difference between push-pull and latch holder fastening types?

A: Push-pull fastening uses a simple push-to-connect, pull-to-disconnect mechanism. Latch holder fastening uses a latching mechanism for more secure mating. Both provide equivalent electrical connectivity; selection depends on application requirements for connection security and ease of mating/unmating.

Q: Are the HARTING 09185406323 and 09185407323 interchangeable?

A: Both parts share identical electrical and mechanical specifications, including right-angle mounting, latch holder fastening, 40-position configuration, and 0.100" pitch. They are functionally interchangeable. Differences in part numbering may reflect manufacturing or packaging variations.

Q: Why does the main part specify 3.4A per contact while some substitutes do not specify current rating?

A: Current rating is determined by contact material, contact geometry, and insulation material. The main part's 3.4A rating reflects its specific design. Substitute parts with unspecified current ratings may have different contact designs. Consult manufacturer datasheets for detailed current-carrying specifications when current rating is critical to your application.

Q: Can I use HIF3FC-40PA-2.54DS(71) in applications requiring operation above 85°C?

A: No. The HIF3FC-40PA-2.54DS(71) is rated for -55°C to 85°C operation. For applications requiring operation above 85°C, select the main part (to 105°C), the HARTING parts (to 125°C), or the TE Connectivity 3-1761605-3 (to 105°C).

Q: What packaging formats are available for these parts?

A: The main part HTST-120-04-T-D-RA is supplied in Tube packaging. Substitute parts are available in Bulk (HARTING parts), Tube (Amphenol ICC parts), or Tray (Hirose part) packaging. Packaging selection may affect procurement lead times and minimum order quantities.

Q: Are all these parts ROHS3 compliant?

A: The main part and most substitutes are ROHS3 compliant. The Amphenol ICC parts (75867-107LF and 75867-307LF) are RoHS compliant. All parts meet regulatory requirements for lead-free solder applications.

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