OSTTT084180 Terminal Block Plug - Equivalent & Substitute Parts

Part Overview

The OSTTT084180 is an 8-position terminal block plug manufactured by On Shore Technology Inc., designed for unshrouded headers with 0.150" (3.81mm) pitch spacing. This component features screw termination, free-hanging in-line mounting, and operates across -40°C to 115°C. The product is classified as obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations where equivalent functionality is required.

Key Parameters

Parameter	Value
Manufacturer Part Number	OSTTT084180
Manufacturer	On Shore Technology Inc.
Category	Terminal Blocks
Type	Plug for Unshrouded Header
Number of Positions	8
Pitch	0.150" (3.81mm)
Termination Style	Screw
Mounting Type	Free Hanging (In-Line)
Voltage - UL	300 V
Wire Gauge - AWG	16-28 AWG
Operating Temperature	-40°C ~ 115°C
Contact Material	Phosphor Bronze
Housing Material	Thermoplastic
Torque - Screw	0.2 Nm (1.7 Lb-In)
Wire Strip Length	5-6mm
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the OSTTT084180 is determined by strict equivalence across the following critical parameters:

Position Count & Pitch: 8 positions at 0.150" (3.81mm) spacing (non-negotiable for header compatibility)
Termination Method: Screw termination (functional requirement)
Mounting Configuration: Free-hanging in-line orientation
Electrical Ratings: 300 V UL voltage rating and 16-28 AWG wire gauge compatibility
Temperature Range: -40°C to 115°C operating envelope
Contact & Housing Materials: Phosphor bronze contacts with thermoplastic housing
Compliance: UL94 V-0 flammability rating, ROHS3 compliance, and REACH unaffected status

The substitute part A-TB381-TT08 meets all critical substitution criteria. Differences in plug wire entry orientation (90° vs. unspecified in original) and additional electrical specifications (10 A UL current rating) represent enhancements that do not compromise backward compatibility.

Parameter Comparison

Parameter	OSTTT084180	A-TB381-TT08	Compatibility
Number of Positions	8	8	Equivalent
Pitch	0.150" (3.81mm)	0.150" (3.81mm)	Equivalent
Type	Plug for Unshrouded Header	Plug for Unshrouded Header	Equivalent
Termination Style	Screw	Screw	Equivalent
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)	Equivalent
Voltage - UL	300 V	300 V	Equivalent
Wire Gauge - AWG	16-28 AWG	16-28 AWG	Equivalent
Operating Temperature	-40°C ~ 115°C	-40°C ~ 115°C	Equivalent
Contact Material	Phosphor Bronze	Phosphor Bronze	Equivalent
Housing Material	Thermoplastic	Thermoplastic	Equivalent
Torque - Screw	0.2 Nm (1.7 Lb-In)	0.2 Nm (1.7 Lb-In)	Equivalent
Wire Strip Length	5-6mm	5-6mm	Equivalent
Material Flammability Rating	UL94 V-0	UL94 V-0	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Obsolete	Active	Substitute is active
Plug Wire Entry	Not specified	90°	Enhanced specification
Current - UL	Not specified	10 A	Enhanced specification

Engineering Selection Recommendations

The A-TB381-TT08 manufactured by Assmann WSW Components is a direct functional equivalent to the obsolete OSTTT084180. Both components share identical electrical ratings, mechanical dimensions, and compliance certifications. The substitute part carries active product status, ensuring ongoing availability and supply chain continuity.

The A-TB381-TT08 provides additional specifications not present in the original part documentation: a defined 90° plug wire entry orientation and a 10 A UL current rating. These specifications enhance the component's functional definition without introducing incompatibility. The substitute maintains ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the original design.

Selection of the A-TB381-TT08 is appropriate for direct replacement applications where the OSTTT084180 is no longer available, as well as for new designs requiring 8-position, 3.81mm pitch terminal block plugs with screw termination and free-hanging mounting.

Frequently Asked Questions (FAQ)

Q: Can the A-TB381-TT08 be used as a direct replacement for the OSTTT084180 in existing assemblies?

A: Yes. Both components share identical position count (8), pitch spacing (3.81mm), termination method (screw), mounting type (free-hanging in-line), voltage rating (300 V), wire gauge compatibility (16-28 AWG), operating temperature range (-40°C to 115°C), and material specifications. The substitute part is mechanically and electrically compatible.

Q: What is the significance of the 90° plug wire entry specification in the A-TB381-TT08?

A: The 90° wire entry orientation is a defined mechanical characteristic of the A-TB381-TT08. This specification clarifies the wire approach angle to the terminal block. Compatibility depends on the physical layout requirements of the target application.

Q: Are there compliance or regulatory differences between the two parts?

A: No. Both components are ROHS3 compliant, REACH unaffected, and carry UL94 V-0 flammability ratings. Regulatory compliance is equivalent.

Q: Why is the OSTTT084180 classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by On Shore Technology Inc. The A-TB381-TT08 provides equivalent functionality with active product status and ongoing manufacturer support.

Q: Does the 10 A UL current rating of the A-TB381-TT08 affect compatibility?

A: No. The current rating is an additional specification that defines the component's electrical capacity. The absence of a specified current rating in the OSTTT084180 documentation does not create incompatibility; the substitute part's current rating represents a defined electrical characteristic suitable for applications requiring this component type.

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