TTC-8137 Equivalent & Substitute Parts Reference

Part Overview

The TTC-8137 is a LAN 1000 Base-T Pulse Transformer manufactured by Tamura, designed for Gigabit Ethernet applications requiring galvanic isolation and signal conditioning. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and production continuity. The part is supplied in a 24-SOIC surface mount package with a turns ratio of 1CT:1CT and operates across the industrial temperature range of 0°C to 70°C.

Substiute Parts

TTC-8137

TamuraIn Stock: 939TTC-8137 Datasheet

Current PartRFQ

H5007NL

Pulse ElectronicsIn Stock: 1984H5007NL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TTC-8137 is based on the following mandatory alignment criteria:

Primary Compatibility Requirements:

• Transformer classification: LAN 1000 Base-T or Isolation and Data Interface (Encapsulated) for Gigabit Ethernet applications
• Turns ratio: 1CT:1CT (primary to secondary)
• Mounting technology: Surface Mount
• Package format: 24-SOIC
• Operating temperature range: 0°C ~ 70°C minimum

Secondary Considerations:

• Physical dimensions must accommodate existing PCB footprint constraints
• Height clearance must not exceed 0.236" (6.00mm) seated maximum
• Electrical isolation and data interface functionality must be maintained

The H5007NL from Pulse Electronics satisfies all primary compatibility requirements. While classified as an Isolation and Data Interface (Encapsulated) transformer rather than a discrete LAN 1000 Base-T type, it maintains the identical 1CT:1CT turns ratio, 24-SOIC package, surface mount configuration, and 0°C to 70°C operating temperature range. The H5007NL is currently in active production status, ensuring supply continuity.

Parameter Comparison

Engineering Selection Recommendations

For TTC-8137 Replacement:

The H5007NL is the qualified substitute for the obsolete TTC-8137. Selection of this alternative is justified on the following engineering grounds:

1. Functional Equivalence: Both components provide LAN Gigabit Ethernet isolation and data interface functionality with identical 1CT:1CT turns ratios and 24-SOIC surface mount packaging.

2. Supply Continuity: The TTC-8137 is obsolete with no long-term availability guarantee. The H5007NL is in active production status with confirmed inventory of 1885 pieces, ensuring reliable procurement for new designs and production runs.

3. Compliance Status: The H5007NL is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The TTC-8137 compliance status is not specified.

4. Physical Compatibility: The H5007NL footprint (0.690" L x 0.480" W) differs from the TTC-8137 (0.535" L x 0.594" W), requiring PCB layout verification. However, the H5007NL seated height of 0.227" is lower than the TTC-8137 maximum of 0.236", providing improved clearance margins.

5. Moisture Handling: The H5007NL has MSL 4 (72-hour storage window) compared to the TTC-8137 MSL 1 (unlimited). This requires implementation of controlled storage and handling procedures during manufacturing.

Design Validation Required: PCB layout modification to accommodate the different footprint dimensions is necessary before production implementation.

Frequently Asked Questions (FAQ)

Q: Can the H5007NL be used as a direct pin-for-pin replacement for the TTC-8137?

A: The H5007NL is electrically compatible with the TTC-8137 due to identical turns ratio (1CT:1CT), package type (24-SOIC), and operating temperature range (0°C to 70°C). However, the physical footprint dimensions differ: H5007NL is 0.690" L x 0.480" W versus TTC-8137 at 0.535" L x 0.594" W. PCB layout modification is required; direct footprint substitution without layout changes is not possible.

Q: What are the key electrical parameters that determine substitution compatibility?

A: The critical parameters are: (1) Turns ratio 1CT:1CT, (2) LAN Gigabit Ethernet application class, (3) 24-SOIC surface mount package, and (4) 0°C to 70°C operating temperature range. Both the TTC-8137 and H5007NL meet all four criteria.

Q: Does the H5007NL require different handling procedures than the TTC-8137?

A: Yes. The TTC-8137 has MSL 1 (unlimited moisture sensitivity level), while the H5007NL has MSL 4 (72-hour storage window). The H5007NL requires controlled storage in dry conditions and must be baked according to IPC-A-610 standards if the 72-hour window is exceeded before assembly.

Q: Is the H5007NL height difference significant for PCB assembly?

A: The H5007NL seated height is 0.227" (5.76mm) compared to the TTC-8137 maximum of 0.236" (6.00mm). The H5007NL is 0.009" lower, providing improved clearance margins. This difference is not a constraint for most applications.

Q: What is the availability status of both parts?

A: The TTC-8137 is obsolete with no guaranteed long-term supply. The H5007NL is in active production with 1885 pieces currently in stock, ensuring reliable procurement for ongoing production and new designs.

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

A: The H5007NL is ROHS3 compliant and REACH unaffected. The TTC-8137 compliance status is not specified in available documentation. For applications requiring environmental compliance certification, the H5007NL is the appropriate selection.