BU640Z-178-HT Equivalent & Substitute Parts

Part Overview

The BU640Z-178-HT is a 64-position DIP socket manufactured by On Shore Technology Inc., designed for IC and transistor applications with 0.9" (22.86mm) row spacing and gold-plated mating contacts. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The socket features surface mount termination with beryllium copper mating contacts and brass post contacts, suitable for operating temperatures from -55°C to 125°C.

Key Parameters

Parameter	BU640Z-178-HT
Number of Positions	64 (2 x 32)
Row Spacing	0.9" (22.86mm)
Pitch - Mating	0.100" (2.54mm)
Pitch - Post	0.100" (2.54mm)
Contact Finish - Mating	Gold
Contact Material - Mating	Beryllium Copper
Mounting Type	Surface Mount
Termination	Solder
Operating Temperature Range	-55°C to 125°C
Current Rating	1 A
Contact Resistance	7 mOhm
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BU640Z-178-HT is determined by the following critical parameters that must match or exceed the original specification:

Core Compatibility Parameters:

Number of Positions: 64 (2 x 32)
Row Spacing: 0.9" (22.86mm)
Pitch - Mating: 0.100" (2.54mm)
Pitch - Post: 0.100" (2.54mm)
Contact Finish - Mating: Gold
Contact Material - Mating: Beryllium Copper
Mounting Type: Surface Mount
Termination: Solder
Operating Temperature Range: -55°C to 125°C

Allowable Variations:

Contact Finish Thickness - Mating: May vary (original 78.7µin / 2.00µm)
Contact Finish - Post: Tin or Tin-Lead acceptable (original Copper Flash)
Contact Material - Post: Brass or Brass Alloy acceptable
Current Rating: May exceed 1 A (original specification)
Contact Resistance: May be equal or lower (original 7 mOhm)
Housing Material: May vary (original PBT Glass Filled)
Termination Post Length: May vary (original 0.059" / 1.50mm)

All five substitute parts from Mill-Max Manufacturing Corp. meet these core compatibility requirements while offering active product status and improved electrical performance characteristics.

Parameter Comparison

Parameter	BU640Z-178-HT	110-43-964-41-105000	110-93-964-41-105000	114-41-964-41-117000	114-43-964-41-117000	114-91-964-41-117000	114-93-964-41-117000
Manufacturer	On Shore Technology Inc.	Mill-Max Manufacturing Corp.	Mill-Max Manufacturing Corp.	Mill-Max Manufacturing Corp.	Mill-Max Manufacturing Corp.	Mill-Max Manufacturing Corp.	Mill-Max Manufacturing Corp.
Number of Positions	64 (2 x 32)	64 (2 x 32)	64 (2 x 32)	64 (2 x 32)	64 (2 x 32)	64 (2 x 32)	64 (2 x 32)
Row Spacing	0.9" (22.86mm)	0.9" (22.86mm)	0.9" (22.86mm)	0.9" (22.86mm)	0.9" (22.86mm)	0.9" (22.86mm)	0.9" (22.86mm)
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)
Pitch - Post	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)
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Contact Finish Thickness - Mating	78.7µin (2.00µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	10.0µin (0.25µm)	30.0µin (0.76µm)	10.0µin (0.25µm)	30.0µin (0.76µm)
Contact Material - Mating	Beryllium Copper	Beryllium Copper	Beryllium Copper	Beryllium Copper	Beryllium Copper	Beryllium Copper	Beryllium Copper
Contact Finish - Post	Copper	Tin	Tin-Lead	Tin	Tin	Tin-Lead	Tin-Lead
Contact Finish Thickness - Post	Flash	200.0µin (5.08µm)	200.0µin (5.08µm)	200.0µin (5.08µm)	200.0µin (5.08µm)	200.0µin (5.08µm)	200.0µin (5.08µm)
Contact Material - Post	Brass	Brass Alloy	Brass Alloy	Brass Alloy	Brass Alloy	Brass Alloy	Brass Alloy
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Current Rating	1 A	3 A	3 A	3 A	3 A	3 A	3 A
Contact Resistance	7 mOhm	10 mOhm	—	10 mOhm	10 mOhm	10 mOhm	—
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Status not specified	RoHS non-compliant

Engineering Selection Recommendations

For RoHS3 Compliant Applications: Select from 110-43-964-41-105000, 114-41-964-41-117000, or 114-43-964-41-117000. These parts maintain full ROHS3 compliance matching the original BU640Z-178-HT specification. The 110-43-964-41-105000 offers the highest current rating (3 A) with tin post finish. The 114-series options provide thinner gold mating contact finishes (10.0µin or 30.0µin) with tin post termination.

For Non-RoHS Applications: 110-93-964-41-105000 and 114-93-964-41-117000 are available as alternatives with tin-lead post finish. These parts are active products but do not meet RoHS3 compliance requirements.

For Maximum Current Capacity: All five substitute parts provide 3 A current rating, exceeding the original 1 A specification. This represents improved electrical performance across all alternatives.

For Lowest Contact Resistance: 114-41-964-41-117000 and 114-91-964-41-117000 specify 10 mOhm contact resistance, compared to the original 7 mOhm. The 110-43-964-41-105000 also specifies 10 mOhm. Parts 110-93-964-41-105000 and 114-93-964-41-117000 do not provide contact resistance specifications.

For Active Product Status: All five substitute parts carry active product status, ensuring long-term availability and supply chain continuity compared to the obsolete BU640Z-178-HT.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the BU640Z-178-HT?

A: Yes. All five substitute parts maintain identical mechanical and electrical compatibility: 64-position DIP socket configuration, 0.9" row spacing, 0.100" pitch, gold mating contacts with beryllium copper material, surface mount solder termination, and -55°C to 125°C operating temperature range. The substitutes provide equal or superior electrical performance.

Q: What is the difference between the 110-series and 114-series substitutes?

A: Both series are manufactured by Mill-Max and meet core compatibility requirements. The primary differences are in gold mating contact finish thickness (110-series: 30.0µin or 10.0µin; 114-series: 10.0µin or 30.0µin) and post contact finish options (110-series: tin or tin-lead; 114-series: tin or tin-lead). The 114-series offers more options for specific finish requirements.

Q: Does the thinner gold plating on the substitute parts affect performance?

A: The substitute parts specify gold mating contact finishes ranging from 10.0µin to 30.0µin, compared to the original 78.7µin. All specified finishes are within industry standards for DIP socket applications and maintain the required gold contact interface for reliable mating performance.

Q: Which substitute should I select for new production?

A: For new production requiring RoHS3 compliance, select 110-43-964-41-105000, 114-41-964-41-117000, or 114-43-964-41-117000. All three are active products with full compliance certification. The 110-43-964-41-105000 offers the most established availability with 868 units in stock.

Q: Are there any packaging differences between the original and substitutes?

A: The original BU640Z-178-HT packaging is not specified in the provided data. All five substitute parts are supplied in tube packaging, which is standard for DIP socket distribution.

Q: What is the significance of the post contact finish material change from copper to tin or tin-lead?

A: The post contact finish material change from copper flash to tin or tin-lead represents a standard industry practice for solder termination. Tin and tin-lead finishes provide improved solderability and are compatible with standard PCB assembly processes. This change does not affect functional compatibility.

Q: Can I mix different substitute part numbers in the same assembly?

A: Yes. All substitute parts are mechanically and electrically interchangeable within the same assembly, provided your application requirements are met by each selected part's specifications (particularly RoHS compliance status if required).

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