TML-120-03-G-D Equivalent & Substitute Parts

Part Overview

The TML-120-03-G-D is a shrouded rectangular connector header manufactured by Samtec Inc., designed for through-hole board-to-board applications. This 40-position connector operates across a wide temperature range of -55°C to 125°C and features gold-plated phosphor bronze contacts with 0.050" (1.27mm) pitch spacing. The part is currently in active production status with 1143 units available in inventory. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design alternatives when the primary part becomes unavailable or when application requirements permit functional alternatives.

Substiute Parts

TML-120-03-G-D

Samtec Inc.In Stock: 1158TML-120-03-G-D Datasheet

Current PartRFQ

5-104068-4

TE Connectivity AMP ConnectorsIn Stock: 644685-104068-4 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TML-120-03-G-D is determined by strict alignment of the following critical parameters:

Primary Matching Criteria:

• Connector Type: Header
• Contact Type: Male Pin
• Number of Positions: 40
• Number of Rows: 2
• Pitch - Mating: 0.050" (1.27mm)
• Row Spacing - Mating: 0.100" (2.54mm)
• Mounting Type: Through Hole
• Termination: Solder

Secondary Compatibility Factors:

• Operating Temperature Range: Must support minimum -55°C to 125°C or equivalent
• Contact Finish - Mating: Gold plating required
• Insulation Material: LCP or equivalent thermoplastic
• Product Status: Active

The substitute part 5-104068-4 (TE Connectivity AMP Connectors) meets all primary matching criteria and maintains functional compatibility for board-to-board through-hole solder applications with identical pitch and position specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (TML-120-03-G-D): Select the TML-120-03-G-D when applications require the full operating temperature range of -55°C to 125°C, 4-wall shrouding for enhanced EMI shielding, square contact geometry, or when design specifications explicitly call for Samtec TML series connectors. This part is ROHS3 compliant and maintains active production status.

Substitute Part Selection (5-104068-4): The 5-104068-4 serves as a functional substitute when the primary part is unavailable and the application operates within the reduced temperature range of -65°C to 105°C. This TE Connectivity part maintains identical pitch, position count, and row spacing specifications. The substitute features 2-wall shrouding, circular contacts, and copper alloy contact material. Both parts are RoHS compliant and carry EAR99 export classification. The substitute part is available in higher inventory quantities (64,420 units) and is packaged in tube format versus bulk packaging.

Compatibility Considerations: Substitution is permissible for board-to-board through-hole solder applications where mechanical fit and electrical connectivity are the primary requirements. The differences in shrouding design, contact geometry, and contact finish thickness do not prevent functional interchangeability in standard PCB applications. However, applications with strict thermal requirements above 105°C or below -65°C require the primary part.

Frequently Asked Questions (FAQ)

Q: Can the 5-104068-4 be used as a direct replacement for the TML-120-03-G-D in all applications?

A: The 5-104068-4 is functionally compatible for board-to-board through-hole solder applications with identical pitch and position specifications. However, applications operating above 105°C or below -65°C require the TML-120-03-G-D due to its extended temperature range of -55°C to 125°C. Additionally, designs requiring 4-wall shrouding or square contact geometry must use the primary part.

Q: What are the key differences between these two connectors?

A: The primary differences are: (1) Shrouding design—TML-120-03-G-D features 4-wall shrouding versus 2-wall on the substitute; (2) Contact geometry—square contacts on the primary part versus circular on the substitute; (3) Operating temperature range—TML-120-03-G-D supports -55°C to 125°C versus -65°C to 105°C for the substitute; (4) Contact finish thickness—10.0µin on the primary versus 30.0µin on the substitute; (5) Contact material—phosphor bronze versus copper alloy; (6) Insulation material—LCP versus thermoplastic.

Q: Are both parts RoHS compliant?

A: Yes. The TML-120-03-G-D is ROHS3 compliant, and the 5-104068-4 is RoHS compliant. Both parts meet environmental compliance requirements for restricted substance use.

Q: What is the difference in packaging between these parts?

A: The TML-120-03-G-D is supplied in bulk packaging with 1,143 units in stock. The 5-104068-4 is supplied in tube packaging with 64,420 units available. Packaging format may affect handling, storage, and integration into automated assembly processes.

Q: Can I use the substitute part if my application requires operation at -55°C?

A: No. The 5-104068-4 has a minimum operating temperature of -65°C, which exceeds the -55°C requirement. However, the TML-120-03-G-D supports -55°C operation and is the appropriate selection for this thermal requirement.

Q: Are the electrical specifications identical between these connectors?

A: The substitute part specifies a 30VAC voltage rating, while the primary part does not specify a voltage rating in the provided data. Both parts are designed for identical pitch (0.050"), position count (40), and row spacing (0.100") specifications, ensuring electrical compatibility for standard board-to-board interconnections.

Q: What export classification applies to both parts?

A: Both the TML-120-03-G-D and 5-104068-4 carry EAR99 export classification and share the same HTSUS code (8536.69.4040), indicating equivalent regulatory treatment for international trade purposes.