OSTT7120350 Equivalent & Substitute Parts

Part Overview

The OSTT7120350 is a 12-position wire-to-board terminal block manufactured by On Shore Technology Inc., designed for horizontal mounting with 0.250" (6.35mm) pitch spacing. This component features screw-rising cage clamp termination and is rated for 25 A at 300 V, supporting wire gauges from 12-24 AWG. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations where equivalent functionality is required.

Key Parameters

Parameter	Value
Positions Per Level	12
Pitch	0.250" (6.35mm)
Mating Orientation	Horizontal with Board
Current Rating	25 A
Voltage Rating	300 V
Wire Gauge Range	12-24 AWG
Mounting Type	Through Hole
Wire Termination	Screw - Rising Cage Clamp
Operating Temperature	-30°C ~ 105°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the OSTT7120350 is determined by strict equivalence across the following critical parameters:

Connector Configuration: 12 positions per level with 0.250" (6.35mm) pitch spacing
Electrical Ratings: 25 A current capacity and 300 V voltage rating
Termination Method: Screw-rising cage clamp wire termination
Mounting Architecture: Through-hole horizontal board mounting
Environmental Compliance: ROHS3 compliance and operating temperature range of -30°C to 105°C

The OSTT7120150 qualifies as a direct substitute based on these parameters. While minor variations exist in wire gauge acceptance and torque specifications, the core electrical and mechanical interfaces remain compatible for applications originally designed around the OSTT7120350.

Parameter Comparison

Parameter	OSTT7120350	OSTT7120150	Compatibility
Positions Per Level	12	12	Identical
Pitch	0.250" (6.35mm)	0.250" (6.35mm)	Identical
Mating Orientation	Horizontal with Board	Horizontal with Board	Identical
Current Rating	25 A	25 A	Identical
Voltage Rating	300 V	300 V	Identical
Wire Gauge Range	12-24 AWG	10-24 AWG	Compatible (substitute accepts wider range)
Mounting Type	Through Hole	Through Hole	Identical
Wire Termination	Screw - Rising Cage Clamp	Screw - Rising Cage Clamp	Identical
Operating Temperature	-30°C ~ 105°C	-30°C ~ 105°C	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Torque - Screw	0.49 Nm (4.3 Lb-In)	1.0 Nm (8.9 Lb-In)	Different (substitute requires higher torque)

Engineering Selection Recommendations

The OSTT7120150 is the designated substitute for the obsolete OSTT7120350. Both components maintain identical electrical ratings, mechanical interfaces, and environmental compliance certifications. The OSTT7120150 carries active product status, ensuring continued availability and supply chain reliability.

The primary distinction between these parts is the screw torque specification: the OSTT7120150 requires 1.0 Nm (8.9 Lb-In) compared to the original 0.49 Nm (4.3 Lb-In). This increased torque value reflects improved clamping force and contact reliability in the substitute design. Installation procedures must account for this specification change to ensure proper termination without over-tightening or under-tightening wire connections.

The OSTT7120150 accepts wire gauges from 10-24 AWG, providing expanded compatibility compared to the original 12-24 AWG specification. This broader wire gauge acceptance does not compromise performance for applications within the original specification range.

Frequently Asked Questions (FAQ)

Q: Can the OSTT7120150 be used as a direct replacement for the OSTT7120350 in existing designs?

A: Yes. The OSTT7120150 maintains identical pitch, position count, electrical ratings, and mounting configuration. The primary consideration is the increased screw torque specification (1.0 Nm versus 0.49 Nm), which must be observed during installation.

Q: What is the significance of the wire gauge range difference between these parts?

A: The OSTT7120350 accepts 12-24 AWG wire, while the OSTT7120150 accepts 10-24 AWG. The substitute's expanded range provides greater flexibility for applications requiring smaller gauge conductors. Existing designs using wire within the 12-24 AWG range experience no functional change.

Q: Are there packaging differences between these substitute parts?

A: The OSTT7120350 was supplied in standard packaging, while the OSTT7120150 is available in bulk packaging. Both components are identical in form, fit, and function. Packaging selection depends on procurement volume and inventory management requirements.

Q: Why is the OSTT7120350 classified as obsolete?

A: The OSTT7120350 has been superseded by the OSTT7120150 within the manufacturer's product line. The OSTT7120150 offers improved specifications and maintains active production status, making it the recommended choice for new designs and ongoing component sourcing.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the OSTT7120350 and OSTT7120150 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

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