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BU240Z-178-HT DIP Socket 24-Position Equivalent & Substitute Parts
Part Overview
The BU240Z-178-HT is a 24-position DIP socket manufactured by On Shore Technology Inc., designed for surface mount applications with 0.6" row spacing and gold-plated mating contacts. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The socket accommodates standard 24-pin DIP integrated circuits with 0.100" pitch and provides reliable electrical connection through beryllium copper contacts with gold surface finish.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | BU240Z-178-HT |
| Manufacturer | On Shore Technology Inc. |
| Number of Positions | 24 (2 x 12) |
| Row Spacing | 0.6" (15.24mm) |
| Pitch - Mating | 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 |
| Housing Material | Polybutylene Terephthalate (PBT), Glass Filled |
| Flammability Rating | UL94 V-0 |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution eligibility for the BU240Z-178-HT is determined by the following critical parameters:
- Position Count & Row Spacing: All substitutes must maintain 24 positions in 2 x 12 configuration with 0.6" (15.24mm) row spacing
- Pitch - Mating: 0.100" (2.54mm) pitch is mandatory for DIP IC compatibility
- Contact Material - Mating: Beryllium copper is the standard contact material across all qualified substitutes
- Mounting Type: Surface mount configuration required
- Termination Method: Solder termination only
- Operating Temperature: -55°C to 125°C range must be maintained
- Contact Finish - Mating: Gold plating is the primary finish; tin and tin-lead alternatives are available for specific applications
Substitutes are grouped by manufacturer and series designation. Active product status substitutes from Mill-Max Manufacturing Corp. (Series 110 and 114) and Preci-Dip (Series 114) provide direct functional equivalence. The Samtec Inc. ICF-624-F-O variant offers alternative construction with open frame design.
Parameter Comparison
| Parameter | BU240Z-178-HT | 110-43-624-41-105000 | 110-93-624-41-105000 | 114-41-624-41-117000 | 114-43-624-41-117000 | 114-87-624-41-117101 | 114-91-624-41-117000 | 114-93-624-41-117000 | 214-44-624-01-670800 | 214-99-624-01-670800 | ICF-624-F-O |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | On Shore Technology Inc. | Mill-Max | Mill-Max | Mill-Max | Mill-Max | Preci-Dip | Mill-Max | Mill-Max | Mill-Max | Mill-Max | Samtec Inc. |
| Positions | 24 (2x12) | 24 (2x12) | 24 (2x12) | 24 (2x12) | 24 (2x12) | 24 (2x12) | 24 (2x12) | 24 (2x12) | 24 (2x12) | 24 (2x12) | 24 (2x12) |
| Row Spacing | 0.6" (15.24mm) | 0.6" (15.24mm) | 0.6" (15.24mm) | 0.6" (15.24mm) | 0.6" (15.24mm) | 0.6" (15.24mm) | 0.6" (15.24mm) | 0.6" (15.24mm) | 0.6" (15.24mm) | 0.6" (15.24mm) | 0.6" (15.24mm) |
| 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) | 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 | Gold | Tin | Tin-Lead | Gold |
| Contact Material - Mating | Beryllium Copper | Beryllium Copper | Beryllium Copper | Beryllium Copper | Beryllium Copper | Beryllium Copper | Beryllium Copper | Beryllium Copper | Beryllium Copper | Beryllium Copper | Beryllium Copper |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Operating Temperature | -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 | -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 | 1 A | 3 A | 3 A | 3 A | 3 A | Not specified |
| Contact Resistance | 7 mOhm | 10 mOhm | Not specified | 10 mOhm | 10 mOhm | 10 mOhm | 10 mOhm | Not specified | Not specified | Not specified | Not specified |
| Housing Material | PBT, Glass Filled | PCT, Polyester | PCT, Polyester | PCT, Polyester | PCT, Polyester | PCT, Polyester, Glass Filled | PCT, Polyester | PCT, Polyester | PCT, Polyester | PCT, Polyester | Liquid Crystal Polymer (LCP) |
| Flammability Rating | UL94 V-0 | UL94 V-0 | Not specified | UL94 V-0 | UL94 V-0 | UL94 V-0 | UL94 V-0 | Not specified | Not specified | Not specified | Not specified |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | Not specified | RoHS non-compliant | ROHS3 Compliant | RoHS non-compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Primary Substitutes (ROHS3 Compliant, Active Status)
The Mill-Max 110-43-624-41-105000 and 114-series variants (114-41-624-41-117000, 114-43-624-41-117000, 114-91-624-41-117000) are recommended as primary substitutes. These parts maintain ROHS3 compliance, active product status, and full functional compatibility with the BU240Z-178-HT. The 114-series offers enhanced current rating (3 A versus 1 A) and improved contact finish thickness specifications. The Preci-Dip 114-87-624-41-117101 provides an alternative with glass-filled housing material and active status.
Secondary Substitutes (Compliance Considerations)
The Mill-Max 214-series (214-44-624-01-670800 and 214-99-624-01-670800) offer closed frame construction with active status. The 214-44 variant maintains ROHS3 compliance with tin mating finish. The 214-99 variant uses tin-lead finish and is RoHS non-compliant; selection requires compliance verification for the target application.
Alternative Construction (Samtec ICF-624-F-O)
The Samtec ICF-624-F-O provides ROHS3-compliant construction with liquid crystal polymer housing and open frame design. This variant offers alternative material selection for applications requiring specific thermal or mechanical properties.
Non-Recommended Substitutes
The Mill-Max 110-93-624-41-105000 and 114-93-624-41-117000 are RoHS non-compliant and lack specified flammability ratings. These parts are suitable only for legacy applications without RoHS requirements.
Frequently Asked Questions (FAQ)
Q: Can the BU240Z-178-HT be directly replaced with any of these substitutes?
A: Direct replacement is possible only with substitutes maintaining identical mechanical and electrical parameters. The Mill-Max 110-43-624-41-105000, 114-41-624-41-117000, and 114-43-624-41-117000 provide direct functional equivalence with enhanced specifications. Substitutes with different contact finishes (tin or tin-lead) require application-specific compatibility assessment.
Q: What is the difference between gold, tin, and tin-lead contact finishes?
A: Contact finish affects corrosion resistance and solderability. Gold provides superior corrosion resistance and is suitable for high-reliability applications. Tin and tin-lead finishes are cost-effective alternatives with adequate performance for standard applications. The BU240Z-178-HT uses gold finish; substitutes with tin or tin-lead finishes (214-series) represent functional alternatives with different material properties.
Q: Are there current rating differences between the main part and substitutes?
A: Yes. The BU240Z-178-HT is rated at 1 A, while most Mill-Max substitutes (110-43, 114-41, 114-43, 114-91, 214-series) are rated at 3 A. The Preci-Dip 114-87-624-41-117101 maintains 1 A rating. Higher current ratings indicate improved electrical capacity and are backward-compatible with 1 A applications.
Q: What is the significance of open frame versus closed frame construction?
A: Open frame design (BU240Z-178-HT, 110-series, 114-series, ICF-624-F-O) provides easier IC insertion and removal. Closed frame design (214-series) offers enhanced mechanical stability and contact retention. Both designs are functionally equivalent for standard DIP socket applications.
Q: Which substitutes maintain ROHS3 compliance?
A: ROHS3-compliant substitutes include 110-43-624-41-105000, 114-41-624-41-117000, 114-43-624-41-117000, 114-87-624-41-117101, 214-44-624-01-670800, and ICF-624-F-O. The 110-93, 114-93, and 214-99 variants are RoHS non-compliant and require compliance verification before selection.
Q: What housing material differences exist among substitutes?
A: The BU240Z-178-HT uses polybutylene terephthalate (PBT) with glass filler. Most Mill-Max substitutes use polycyclohexylenedimethylene terephthalate (PCT) polyester. The Preci-Dip 114-87 uses PCT polyester with glass filler. The Samtec ICF-624-F-O uses liquid crystal polymer (LCP). All materials meet UL94 V-0 flammability requirements where specified and are suitable for surface mount applications.
Q: Are contact resistance specifications critical for substitution?
A: Contact resistance values are provided for most substitutes (10 mOhm) and are comparable to the original part (7 mOhm). Substitutes without specified contact resistance (214-series, ICF-624-F-O) are functionally equivalent for standard DIP socket applications where contact resistance is not a critical design parameter.
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