A 40-LC-TT DIP Socket 40-Position Equivalent & Substitute Parts

Part Overview

The A 40-LC-TT is a 40-position DIP socket manufactured by Assmann WSW Components, designed for through-hole mounting of dual inline package integrated circuits. This connector features a 0.6" (15.24mm) row spacing with tin-plated phosphor bronze contacts and is rated for 1 A continuous current. The part maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical performance, mechanical compatibility, and environmental specifications within the DIP socket category.

Key Parameters

Parameter	Value
Manufacturer Part Number	A 40-LC-TT
Manufacturer	Assmann WSW Components
Number of Positions	40 (2 x 20)
Row Spacing	0.6" (15.24mm)
Pitch - Mating	0.100" (2.54mm)
Pitch - Post	0.100" (2.54mm)
Contact Finish - Mating	Tin
Contact Material - Mating	Phosphor Bronze
Mounting Type	Through Hole
Termination	Solder
Operating Temperature Range	-55°C ~ 85°C
Current Rating	1 A
Contact Resistance	30mOhm
Housing Material	Polybutylene Terephthalate (PBT)
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters: 40-position configuration, 0.6" row spacing, 0.100" mating and post pitch, through-hole solder termination, and UL94 V-0 flammability rating. All substitute parts listed maintain these core mechanical and electrical specifications. Substitutes are grouped into two categories based on contact finish:

Tin-Plated Substitutes (Direct electrical and mechanical equivalents): Parts with tin-plated mating contacts and phosphor bronze or copper alloy contact materials. These include 1-2199299-5 (TE Connectivity), 243-40-1-06 (CNC Tech), and DILB40P-223TLF (Amphenol ICC). These parts maintain the same contact finish as the primary part and are suitable for direct replacement in applications where tin plating is specified.

Gold-Plated Substitutes (Enhanced contact performance): Parts with gold-plated mating contacts and beryllium copper contact materials. These include 110-87-640-41-001101 (Preci-Dip), 40-6518-10 (Aries Electronics), and the Mill-Max Manufacturing Corp. series (110-13-640-41-001000, 110-13-640-41-801000, 110-41-640-41-001000, 110-43-640-41-001000, 110-43-640-41-801000). Gold plating provides lower contact resistance and enhanced corrosion resistance compared to tin plating.

Parameter Comparison

Part Number	Manufacturer	Positions	Row Spacing	Mating Pitch	Contact Finish	Contact Material (Mating)	Operating Temp	Current Rating	Contact Resistance	Housing Material	RoHS Status
A 40-LC-TT	Assmann WSW	40 (2x20)	0.6"	0.100"	Tin	Phosphor Bronze	-55°C ~ 85°C	1 A	30mOhm	PBT	ROHS3
1-2199299-5	TE Connectivity	40 (2x20)	0.6"	0.100"	Tin	Phosphor Bronze	-40°C ~ 105°C	1 A	20mOhm	PBT, Glass Filled	ROHS3
110-87-640-41-001101	Preci-Dip	40 (2x20)	0.6"	0.100"	Gold	Beryllium Copper	-55°C ~ 125°C	1 A	10mOhm	PCT/Polyester, Glass Filled	ROHS3
243-40-1-06	CNC Tech	40 (2x20)	0.6"	0.100"	Tin	Phosphor Bronze	-40°C ~ 105°C	1 A	20mOhm	PBT, Glass Filled	ROHS3
40-6518-10	Aries Electronics	40 (2x20)	0.6"	0.100"	Gold	Beryllium Copper	Not Specified	3 A	Not Specified	PA46, Nylon 4/6, Glass Filled	ROHS3
DILB40P-223TLF	Amphenol ICC (FCI)	40 (2x20)	0.6"	0.100"	Tin	Copper Alloy	-55°C ~ 105°C	1 A	30mOhm	PA, Nylon	RoHS Compliant
110-13-640-41-001000	Mill-Max Mfg.	40 (2x20)	0.6"	0.100"	Gold	Beryllium Copper	-55°C ~ 125°C	3 A	Not Specified	PCT, Polyester	ROHS3
110-13-640-41-801000	Mill-Max Mfg.	40 (2x20)	0.6"	0.100"	Gold	Beryllium Copper	-55°C ~ 125°C	3 A	Not Specified	PCT, Polyester	ROHS3
110-41-640-41-001000	Mill-Max Mfg.	40 (2x20)	0.6"	0.100"	Gold	Beryllium Copper	-55°C ~ 125°C	3 A	Not Specified	PCT, Polyester	ROHS3
110-43-640-41-001000	Mill-Max Mfg.	40 (2x20)	0.6"	0.100"	Gold	Beryllium Copper	-55°C ~ 125°C	3 A	Not Specified	PCT, Polyester	ROHS3
110-43-640-41-801000	Mill-Max Mfg.	40 (2x20)	0.6"	0.100"	Gold	Beryllium Copper	-55°C ~ 125°C	3 A	Not Specified	PCT, Polyester	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, ensuring regulatory alignment with the primary A 40-LC-TT part. Selection between tin-plated and gold-plated options depends on application requirements. Tin-plated substitutes (1-2199299-5, 243-40-1-06, DILB40P-223TLF) provide cost-effective equivalents with comparable contact resistance and current ratings. Gold-plated substitutes (110-87-640-41-001101, 40-6518-10, Mill-Max series) offer superior contact resistance performance and extended operating temperature ranges, with some variants rated for 3 A current capacity.

For applications operating within the -55°C to 85°C range specified for the A 40-LC-TT, all tin-plated substitutes are mechanically and electrically compatible. For applications requiring extended temperature operation or enhanced contact performance, gold-plated options provide additional margin. The 40-6518-10 and Mill-Max variants with 3 A current rating accommodate higher current applications while maintaining the same 40-position, 0.6" row spacing configuration.

Frequently Asked Questions (FAQ)

Q: Can I substitute a gold-plated socket for a tin-plated socket? A: Yes. Gold-plated substitutes maintain the same 40-position configuration, 0.6" row spacing, and 0.100" pitch specifications. Gold plating provides lower contact resistance (10mOhm versus 30mOhm) and enhanced corrosion resistance. No design changes are required for direct substitution.

Q: What is the difference between the Mill-Max 110-13, 110-41, and 110-43 series? A: All three series share identical electrical and mechanical specifications: 40 positions, 0.6" row spacing, gold-plated beryllium copper contacts, and 3 A current rating. The numeric designations (13, 41, 43) represent different internal design variants within the Mill-Max 110 series. Selection among these variants depends on specific application requirements not detailed in the provided specifications.

Q: Are the Mill-Max parts with decoupling capacitors (801000 suffix) compatible with standard applications? A: The 110-13-640-41-801000 and 110-43-640-41-801000 variants include integrated decoupling capacitors as an additional feature. These parts maintain full mechanical and electrical compatibility with standard 40-position DIP socket applications. The decoupling capacitor feature does not affect substitution compatibility.

Q: What is the operating temperature difference between the A 40-LC-TT and substitute parts? A: The A 40-LC-TT operates from -55°C to 85°C. Tin-plated substitutes (1-2199299-5, 243-40-1-06) extend the upper limit to 105°C. Gold-plated substitutes and Mill-Max variants extend operation to 125°C. For applications within the original -55°C to 85°C specification, all substitutes are compatible. Extended temperature applications require selection of parts rated to 105°C or 125°C.

Q: Does packaging format affect substitution compatibility? A: Packaging format (tube versus bulk) does not affect electrical or mechanical compatibility. The A 40-LC-TT is supplied in tube packaging. Substitutes supplied in bulk packaging (40-6518-10) are electrically and mechanically equivalent; packaging selection depends on procurement and handling requirements.

Q: What contact resistance values should I consider for my application? A: The A 40-LC-TT specifies 30mOhm contact resistance. Tin-plated substitutes (1-2199299-5, 243-40-1-06) provide 20mOhm resistance. Gold-plated substitutes provide 10mOhm resistance (110-87-640-41-001101) or unspecified values (Aries and Mill-Max variants). Lower contact resistance reduces voltage drop and heat generation in high-current or sensitive signal applications.

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