H1081T Equivalent & Substitute Parts

Part Overview

The H1081T is a LAN 10/100 Base-T Pulse Transformer manufactured by Pulse Electronics, designed for 1:1.41 transmitter and 1:1 receiver applications in network interface circuits. This component features surface mount packaging with compact dimensions of 1.000" L x 0.395" W (25.40mm x 10.03mm). The H1081T is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

H1081T

Pulse ElectronicsIn Stock: 2154H1081T Datasheet

Current PartRFQ

H1081NLT

Pulse ElectronicsIn Stock: 1492H1081NLT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the H1081T is determined by the following critical parameters:

• Turns Ratio: Primary:Secondary ratio of 1:1.41 (transmitter) and 1:1 (receiver) must be maintained or functionally equivalent
• Mounting Type: Surface mount configuration required for PCB compatibility
• Physical Dimensions: Footprint of 1.000" L x 0.395" W and height of 0.230" maximum to ensure mechanical fit
• Operating Temperature Range: 0°C to 70°C operational specification
• Transformer Classification: LAN 10/100 Base-T or equivalent isolation and data interface functionality

The H1081NLT qualifies as a direct substitute based on matching turns ratio (1:1.141 transmitter, 1:1 receiver), identical physical dimensions, surface mount configuration, and compatible operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The H1081NLT is the qualified substitute for the obsolete H1081T. Selection of the H1081NLT provides the following advantages:

• Active Product Status: The H1081NLT maintains active production status, ensuring long-term availability and supply chain continuity
• RoHS3 Compliance: The substitute meets ROHS3 compliance requirements, whereas the original H1081T is non-compliant
• Improved Moisture Sensitivity: MSL rating of 3 (168 hours) provides extended handling and storage capability compared to MSL 4 (72 hours)
• Functional Equivalence: Turns ratio of 1:1.141 transmitter and 1:1 receiver maintains circuit performance within acceptable tolerances
• Identical Mechanical Fit: Matching dimensions and surface mount configuration ensure direct PCB compatibility without layout modifications

Frequently Asked Questions (FAQ)

Q: Can the H1081NLT directly replace the H1081T without circuit modifications?

A: Yes. The H1081NLT provides functional equivalence through matching turns ratios (1:1.141 vs. 1:1.41 transmitter; 1:1 receiver), identical physical dimensions, and surface mount configuration. No circuit modifications are required.

Q: What is the difference between LAN 10/100 Base-T and Isolation and Data Interface (Encapsulated) transformer types?

A: Both designations describe transformers suitable for LAN 10/100 applications. The H1081NLT uses the encapsulated classification, indicating improved isolation characteristics and environmental protection compared to the original H1081T specification.

Q: Does the improved MSL rating of the H1081NLT affect circuit performance?

A: No. MSL rating pertains to moisture absorption during storage and handling, not circuit performance. The improved MSL 3 rating of the H1081NLT provides extended shelf life and handling flexibility compared to MSL 4.

Q: Is the H1081NLT available in packaging formats other than Tape & Reel?

A: The provided data specifies H1081NLT availability in Tape & Reel (TR) packaging. Consult the manufacturer for alternative packaging options if required.

Q: What compliance certifications apply to the H1081NLT?

A: The H1081NLT is ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8504.31.2000.