SM51589EL Equivalent & Substitute Parts

Part Overview

The SM51589EL is a 350µH LAN 10/100 Base-T pulse transformer manufactured by Bourns Inc., designed for surface mount applications in Ethernet networking equipment. This component features a 1CT:1CT turns ratio and operates across the industrial temperature range of -40°C to 85°C. The part is classified as obsolete, making identification of compatible substitutes essential for ongoing design support and production continuity.

Substiute Parts

SM51589EL

Bourns Inc.In Stock: 2975SM51589EL Datasheet

Current PartRFQ

SM51589PEL

Bourns Inc.In Stock: 1719SM51589PEL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The SM51589PEL qualifies as a direct substitute for the SM51589EL based on the following critical parameters:

• Inductance Match: Both parts specify 350µH, ensuring equivalent magnetic performance
• Turns Ratio Match: Both maintain 1CT:1CT configuration for identical impedance transformation
• Mounting Compatibility: Both are surface mount components with compatible footprints
• Physical Dimensions: Dimensions are within acceptable tolerance (0.694" vs 0.691" length; 0.480" width identical; 0.236" height identical)
• Temperature Range Match: Both operate across -40°C to 85°C
• Regulatory Compliance: Both are ROHS3 compliant, REACH unaffected, and share identical ECCN and HTSUS classifications
• Moisture Sensitivity: Both rated MSL 1 (Unlimited)

The primary distinction is the enhanced LAN specification (10/100/1000 Base-T vs 10/100 Base-T) and active product status of the substitute, making it suitable for forward-compatible designs.

Parameter Comparison

Engineering Selection Recommendations

The SM51589PEL is the appropriate substitute for the obsolete SM51589EL. Selection is justified on the following grounds:

• Regulatory Alignment: Both parts maintain identical ROHS3, REACH, ECCN, and HTSUS classifications, ensuring compliance continuity
• Electrical Equivalence: Matching inductance (350µH) and turns ratio (1CT:1CT) guarantee functional interchangeability in LAN transformer applications
• Physical Compatibility: Dimensions remain within acceptable manufacturing tolerances for PCB footprint compatibility
• Active Product Status: The SM51589PEL is actively manufactured and stocked, providing long-term supply chain reliability compared to the obsolete SM51589EL
• Enhanced Specification: The SM51589PEL supports LAN 10/100/1000 Base-T operation, offering backward compatibility with 10/100 Base-T designs while enabling forward compatibility with Gigabit Ethernet applications

Frequently Asked Questions (FAQ)

Q: Can SM51589PEL directly replace SM51589EL on existing PCBs?

A: Yes. The physical dimensions are compatible (length difference of 0.003", width and height identical), and electrical parameters are equivalent. PCB footprints designed for SM51589EL will accommodate SM51589PEL without modification.

Q: What is the significance of the LAN 10/100/1000 Base-T specification on the substitute?

A: The SM51589PEL supports Gigabit Ethernet (1000 Base-T) in addition to Fast Ethernet (10/100 Base-T). This enhanced specification maintains full compatibility with 10/100 Base-T designs while enabling use in higher-speed networking applications.

Q: Are there packaging differences between these parts?

A: Yes. The SM51589EL is supplied in bulk packaging, while the SM51589PEL is supplied in Tape & Reel (TR) format. Both are suitable for automated assembly; packaging selection depends on production volume and handling requirements.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both SM51589EL and SM51589PEL are ROHS3 compliant, REACH unaffected, and share identical ECCN (EAR99) and HTSUS (8504.31.2000) classifications.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -40°C to 85°C, ensuring equivalent thermal performance in industrial and commercial applications.

Q: Why is the SM51589EL classified as obsolete?

A: Obsolescence typically reflects manufacturer discontinuation. The SM51589PEL represents the active replacement, offering equivalent or enhanced functionality with ongoing manufacturing support.