STO-41T-187N Equivalent & Substitute Parts

Part Overview

The STO-41T-187N is a 0.187" (4.75mm) Quick Connect Female crimp connector manufactured by JST Sales America Inc., designed for 16-20 AWG wire termination. This non-insulated terminal operates as a free-hanging in-line component and is classified as Active product status. Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, enabling direct functional replacement in applications where the connector interfaces with standard quick-connect receptacles.

Key Parameters

Parameter	Value
Tab Width	0.187" (4.75mm)
Tab Thickness	0.032" (0.81mm)
Tab Length	0.250" (6.35mm)
Wire Gauge	16-20 AWG
Termination Method	Crimp
Gender	Female
Insulation Type	Non-Insulated
Contact Material	Brass
Contact Finish	Tin
Mounting Type	Free Hanging (In-Line)

Substitute Part Grouping Explanation

Substitution eligibility for the STO-41T-187N is determined by strict alignment of the following critical parameters:

Tab Width: 0.187" (4.75mm) — must match exactly for mechanical fit
Wire Gauge: 16-20 AWG — must match for proper crimp contact
Gender: Female — must match for connector pairing
Termination: Crimp — must match for assembly compatibility
Contact Material and Finish: Brass with Tin — must match for electrical performance and corrosion resistance
Mounting Type: Free Hanging (In-Line) — must match for application fit

The substitute part 42617-2 (TE Connectivity AMP Connectors, Faston series) meets all critical electrical and mechanical parameters. Variations in tab thickness (0.032" vs. 0.020"), overall length (0.591" vs. 0.585"), and insulation diameter ranges represent acceptable manufacturing tolerances within the 0.187" quick-connect standard and do not preclude functional equivalence.

Parameter Comparison

Parameter	STO-41T-187N (JST)	42617-2 (TE Connectivity)	Match Status
Tab Width	0.187" (4.75mm)	0.187" (4.75mm)	Exact Match
Tab Thickness	0.032" (0.81mm)	0.020" (0.51mm)	Within Tolerance
Tab Length	0.250" (6.35mm)	0.250" (6.35mm)	Exact Match
Wire Gauge	16-20 AWG	16-20 AWG	Exact Match
Termination	Crimp	Crimp	Exact Match
Gender	Female	Female	Exact Match
Insulation Type	Non-Insulated	Non-Insulated	Exact Match
Contact Material	Brass	Brass	Exact Match
Contact Finish	Tin	Tin	Exact Match
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)	Exact Match
Overall Length	0.591" (15.00mm)	0.585" (14.86mm)	Within Tolerance
Insulation Diameter Range	0.102" ~ 0.138" (2.59mm ~ 4.61mm)	0.090" ~ 0.130" (2.29mm ~ 3.30mm)	Overlapping Range

Engineering Selection Recommendations

Both the STO-41T-187N and 42617-2 maintain Active product status and comply with RoHS standards (RoHS Compliant and ROHS3 Compliant respectively), ensuring regulatory alignment for current manufacturing and procurement. Both parts carry ECCN EAR99 and HTSUS 8536.90.4000 classifications and feature MSL 1 (Unlimited) moisture sensitivity ratings, indicating equivalent environmental performance.

The 42617-2 substitute is available in higher inventory volume (238,673 pcs vs. 810 pcs) and is supplied in Cut Tape packaging, which may provide procurement advantages in high-volume applications. Selection between these parts should be based on availability, lead time, and packaging requirements rather than electrical or mechanical performance, as both deliver equivalent functionality within the 0.187" quick-connect terminal standard.

Frequently Asked Questions (FAQ)

Q: Can the 42617-2 directly replace the STO-41T-187N in existing assemblies?

A: Yes. Both terminals meet the critical substitution parameters: identical tab width (0.187"), tab length (0.250"), wire gauge (16-20 AWG), gender (Female), termination method (Crimp), and contact material/finish (Brass/Tin). Variations in tab thickness and overall length fall within acceptable manufacturing tolerances for the 0.187" quick-connect standard.

Q: What is the significance of the tab thickness difference (0.032" vs. 0.020")?

A: Tab thickness affects contact pressure and retention force within the mating receptacle. The 42617-2 uses a thinner tab (0.020"), which is characteristic of the Faston series design. Both thicknesses are engineered to function within the 0.187" quick-connect standard and deliver equivalent electrical contact performance.

Q: Are there packaging differences between these parts?

A: Yes. The STO-41T-187N is supplied with unspecified packaging, while the 42617-2 is supplied in Cut Tape (CT) format. Cut Tape packaging is standard for high-volume automated assembly and may offer cost and handling advantages.

Q: Do both parts meet the same compliance standards?

A: Both parts are RoHS compliant, carry identical ECCN and HTSUS classifications, and feature MSL 1 ratings. The STO-41T-187N is RoHS Compliant; the 42617-2 is ROHS3 Compliant. Both meet current regulatory requirements for electronic component procurement.

Q: What is the insulation diameter range overlap?

A: The STO-41T-187N accommodates 0.102" ~ 0.138" insulation diameter, while the 42617-2 accommodates 0.090" ~ 0.130". The overlapping range is 0.102" ~ 0.130", ensuring compatibility for wire gauges within this specification window. Applications using wire insulation outside this overlap should be evaluated individually.

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