Equivalent & Substitute Parts for T1091 Pulse Electronics Telecom Transformer

Part Overview

The T1091 is a 1.2mH T1/E1 dual telecom transformer manufactured by Pulse Electronics, designed for surface mount applications with a 1CT:2CT, 1:1.36CT turns ratio configuration. The part is currently obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The T1091NL represents the active production equivalent with identical electrical and mechanical specifications.

Substiute Parts

T1091

Pulse ElectronicsIn Stock: 1138T1091 Datasheet

Current PartRFQ

T1091NL

Pulse ElectronicsIn Stock: 735T1091NL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T1091 is determined by strict equivalence across the following critical parameters:

• Transformer Type: T1/E1 (Dual) configuration
• Inductance: 1.2mH
• Turns Ratio: 1CT:2CT, 1:1.36CT
• Mounting Type: Surface Mount
• Physical Dimensions: 0.505" L x 0.280" W (12.83mm x 7.11mm)
• Height - Seated (Max): 0.245" (6.22mm)
• Operating Temperature Range: -40°C ~ 85°C
• Moisture Sensitivity Level: 3 (168 Hours)

The T1091NL meets all substitution criteria with identical electrical performance and mechanical compatibility. The primary distinction is product status and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The T1091NL is the direct functional equivalent for the obsolete T1091. Both parts share identical electrical specifications (1.2mH inductance, 1CT:2CT, 1:1.36CT turns ratio) and mechanical form factors (0.505" L x 0.280" W, 0.245" max height). The T1091NL is currently in active production status with 690 units available in inventory.

The T1091NL provides improved regulatory compliance through ROHS3 certification, while maintaining REACH Unaffected and EAR99 export classification status identical to the original part. Both components share the same HTSUS classification (8504.31.2000) and operating temperature range (-40°C ~ 85°C).

For new designs or system refreshes, the T1091NL is the appropriate selection. For legacy system maintenance where original T1091 stock is depleted, the T1091NL provides direct substitution without circuit redesign or PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can the T1091NL be used as a direct replacement for the T1091 in existing designs?

A: Yes. The T1091NL is electrically and mechanically identical to the T1091. All critical parameters—inductance (1.2mH), turns ratio (1CT:2CT, 1:1.36CT), physical dimensions (0.505" L x 0.280" W), and operating temperature range (-40°C ~ 85°C)—are equivalent. No circuit modifications or PCB layout changes are required.

Q: What is the primary difference between the T1091 and T1091NL?

A: The T1091 is obsolete, while the T1091NL is in active production. The T1091NL also carries ROHS3 compliance certification, whereas the T1091 is RoHS non-compliant. All electrical and mechanical specifications remain identical.

Q: Are there any packaging or handling differences between these parts?

A: Both parts share identical Moisture Sensitivity Level (MSL) rating of 3 (168 Hours), indicating equivalent handling and storage requirements. No differences in packaging or moisture protection protocols apply.

Q: What certifications and export classifications apply to the T1091NL?

A: The T1091NL maintains REACH Unaffected status and EAR99 export classification, identical to the original T1091. The part carries ROHS3 compliance certification. HTSUS classification is 8504.31.2000 for both parts.

Q: Is the T1091NL suitable for new product designs?

A: Yes. The T1091NL is the recommended choice for new designs requiring T1/E1 dual telecom transformer functionality with 1.2mH inductance and 1CT:2CT, 1:1.36CT turns ratio configuration in surface mount form factor.