OSTHM045081 Equivalent & Substitute Parts

Part Overview

The OSTHM045081 is a 4-position wire-to-board terminal block manufactured by On Shore Technology Inc., designed for vertical mounting with 0.200" (5.08mm) pitch spacing. This component features press-fit termination and screwless push-in spring wire connections, supporting currents up to 8 A at 250 V. The part is classified as obsolete, making identification of active equivalent components essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Positions Per Level	4
Pitch	0.200" (5.08mm)
Mating Orientation	Vertical with Board
Current Rating	8 A
Voltage Rating	250 V
Wire Gauge	12-28 AWG
Mounting Type	Press Fit
Wire Termination	Screwless - Leg Spring, Push-In Spring
Operating Temperature Range	-30°C ~ 105°C
Housing Material	Thermoplastic
Contact Material - Plating	Brass
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the OSTHM045081 is determined by strict equivalence across the following critical parameters:

Electrical Compatibility: Current rating (8 A), voltage rating (250 V), and wire gauge acceptance (12-28 AWG) must match or exceed the original specification
Physical Compatibility: Position count (4), pitch spacing (0.200" / 5.08mm), and mating orientation (vertical with board) must be identical
Termination Method: Wire termination type (screwless push-in spring) must be functionally equivalent
Environmental Compliance: RoHS3 compliance and operating temperature range must be maintained or improved

The substitute part HM0450810000G, manufactured by Amphenol Anytek, meets all critical substitution criteria while offering enhanced specifications in operating temperature range and contact plating (tin-plated brass).

Parameter Comparison

Parameter	OSTHM045081	HM0450810000G	Compatibility
Manufacturer	On Shore Technology Inc.	Amphenol Anytek	Different manufacturer
Positions Per Level	4	4	Equivalent
Pitch	0.200" (5.08mm)	0.200" (5.08mm)	Equivalent
Mating Orientation	Vertical with Board	Vertical with Board	Equivalent
Current Rating	8 A	8 A	Equivalent
Voltage Rating	250 V	250 V	Equivalent
Wire Gauge	12-28 AWG	12-28 AWG	Equivalent
Mounting Type	Press Fit	Through Hole, Press-Fit	Compatible (HM0450810000G supports both)
Wire Termination	Screwless - Leg Spring, Push-In Spring	Screwless - Leg Spring, Push-In Spring	Equivalent
Operating Temperature Range	-30°C ~ 105°C	-40°C ~ 115°C	HM0450810000G exceeds specification
Housing Material	Thermoplastic	Thermoplastic	Equivalent
Contact Material - Plating	Brass	Brass - Tin Plated	Compatible (tin plating enhances corrosion resistance)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Obsolete	Active	Substitute is actively manufactured

Engineering Selection Recommendations

The HM0450810000G from Amphenol Anytek is a direct functional equivalent to the obsolete OSTHM045081. Both components maintain ROHS3 compliance and identical electrical and mechanical specifications across all critical parameters. The substitute part offers the additional advantage of active product status, ensuring long-term availability and supply chain continuity.

The HM0450810000G supports both through-hole and press-fit mounting configurations, providing design flexibility beyond the original press-fit-only specification. The extended operating temperature range (-40°C ~ 115°C versus -30°C ~ 105°C) and tin-plated brass contacts provide enhanced environmental performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can HM0450810000G be used as a direct replacement for OSTHM045081?

A: Yes. Both components share identical electrical ratings (8 A, 250 V), mechanical configuration (4 positions, 5.08mm pitch), wire termination method (screwless push-in spring), and wire gauge acceptance (12-28 AWG). Both are ROHS3 compliant.

Q: What is the difference in mounting capability between these parts?

A: OSTHM045081 supports press-fit mounting only. HM0450810000G supports both through-hole and press-fit mounting, providing additional design flexibility for board layout modifications.

Q: Does the tin plating on HM0450810000G contacts affect compatibility?

A: No. Tin plating on brass contacts is a compatible enhancement that improves corrosion resistance and contact reliability. It does not affect electrical or mechanical compatibility with the original specification.

Q: Why is the operating temperature range different?

A: HM0450810000G has an extended operating temperature range (-40°C ~ 115°C) compared to OSTHM045081 (-30°C ~ 105°C). This represents an improvement in thermal performance and does not create compatibility issues for applications within the original temperature specification.

Q: Are both parts available in the same packaging?

A: OSTHM045081 packaging is not specified in the original documentation. HM0450810000G is supplied in bulk packaging. Confirm packaging requirements with your procurement specification.

Q: What compliance certifications apply to both parts?

A: Both OSTHM045081 and HM0450810000G are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8536.90.4000.

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