T1105NL Equivalent & Substitute Parts

Part Overview

The T1105NL is a T1/E1 (Quad) Pulse Transformer manufactured by Pulse Electronics, designed for XFRMR T1/E1/CEPT/ISDN-PRI applications with 1:2CT configuration for both transmitter and receiver functions. This component features 1.2mH inductance on both primary and secondary windings and is optimized for surface mount deployment in telecommunications infrastructure.

The T1105NL is classified as Obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance where this transformer remains in active use.

Substiute Parts

T1105NL

Pulse ElectronicsIn Stock: 787T1105NL Datasheet

Current PartRFQ

T1065NL

Pulse ElectronicsIn Stock: 1258T1065NL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T1105NL are identified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Transformer Type: T1/E1 (Quad) configuration
• Inductance Values: 1.2mH on both primary and secondary windings
• Turns Ratio: 1:2CT Transmitter and 1:2CT Receiver
• Mounting Type: Surface Mount
• Physical Dimensions: 1.125" L x 0.485" W (28.58mm x 12.32mm)
• Height - Seated (Max): 0.230" (5.84mm)
• Moisture Sensitivity Level: MSL 4 (72 Hours)

The T1065NL meets all critical electrical and mechanical parameters required for direct substitution. While operating temperature ranges differ between the main part and substitute, both components share identical transformer specifications, physical footprint, and moisture sensitivity classification, enabling functional equivalence in applications within the overlapping temperature envelope.

Parameter Comparison

Engineering Selection Recommendations

The T1065NL is the primary substitute for the obsolete T1105NL. Both components are manufactured by Pulse Electronics and share identical electrical specifications, physical dimensions, and regulatory compliance classifications.

Key Considerations:

The T1065NL carries Active product status, ensuring ongoing availability and supply chain support compared to the Obsolete T1105NL. Both parts maintain REACH Unaffected and EAR99 export classification status, with identical HTSUS commodity codes.

The operating temperature range difference (T1105NL: -40°C ~ 85°C; T1065NL: 0°C ~ 70°C) requires evaluation against specific application requirements. Applications operating within the 0°C ~ 70°C envelope can utilize the T1065NL without thermal performance compromise. Applications requiring extended low-temperature operation below 0°C or sustained operation above 70°C must assess thermal requirements against the substitute's specified range.

Both components are MSL 4 rated, requiring identical moisture handling and storage protocols during assembly operations.

Frequently Asked Questions (FAQ)

Q: Can the T1065NL directly replace the T1105NL in existing designs?

A: The T1065NL provides electrical and mechanical equivalence to the T1105NL. Both transformers feature identical inductance values (1.2mH primary and secondary), turns ratios (1:2CT Transmitter, 1:2CT Receiver), physical footprint (1.125" L x 0.485" W, 5.84mm height), and MSL 4 moisture sensitivity classification. Direct substitution is supported within the T1065NL operating temperature range of 0°C ~ 70°C.

Q: What is the primary difference between the T1105NL and T1065NL?

A: The T1105NL is Obsolete, while the T1065NL is Active. The T1065NL also features a narrower operating temperature range (0°C ~ 70°C versus -40°C ~ 85°C). All other electrical and mechanical parameters are identical.

Q: Are there any compliance or regulatory differences between these parts?

A: Both the T1105NL and T1065NL share identical REACH status (REACH Unaffected), ECCN classification (EAR99), and HTSUS commodity code (8504.31.2000). No compliance or regulatory differentiation exists between the two components.

Q: What does MSL 4 (72 Hours) mean for handling and storage?

A: MSL 4 classification indicates a moisture sensitivity level requiring storage in controlled humidity environments. The 72-hour specification defines the maximum time the component can remain at 30°C and 85% relative humidity before requiring reflow soldering. Both the T1105NL and T1065NL require identical moisture control protocols during assembly and storage.

Q: Can the T1065NL be used in applications requiring the full -40°C ~ 85°C temperature range of the T1105NL?

A: The T1065NL is specified for 0°C ~ 70°C operation. Applications requiring sustained operation below 0°C or above 70°C must evaluate whether the narrower temperature range of the T1065NL meets specific thermal requirements. Alternative solutions may be necessary for extended temperature applications.

Q: Is the T1065NL available in the same packaging as the T1105NL?

A: Yes. Both components are surface mount transformers with identical physical dimensions (1.125" L x 0.485" W, 5.84mm maximum seated height) and footprint compatibility.