PE-51686 Current Sense Transformer Equivalent & Substitute Parts

Part Overview

The PE-51686 is a 20 A current sense transformer designed for non-invasive measurement applications operating in the 20kHz to 200kHz frequency range. This component features a 50:1 current ratio, 5 mH inductance, and through-hole mounting with PC pin termination. The PE-51686 is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

PE-51686

Pulse ElectronicsIn Stock: 844PE-51686 Datasheet

Current PartRFQ

PE-51686NL

Pulse ElectronicsIn Stock: 2154PE-51686NL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PE-51686 is determined by the following critical parameters:

• Current Rating: 20 A (exact match required)
• Frequency Range: 20kHz – 200kHz (exact match required)
• Current Ratio: 50:1 (exact match required)
• Inductance: 5 mH (exact match required)
• Mounting Type: Through Hole (exact match required)
• Termination Style: PC Pin (exact match required)

The PE-51686NL satisfies all substitution criteria. While the PE-51686NL is classified as invasive (versus non-invasive for the original), it maintains identical electrical performance parameters, current handling capacity, frequency response, and physical mounting characteristics. The PE-51686NL is manufactured by Pulse Electronics and carries active product status with RoHS compliance.

Parameter Comparison

Engineering Selection Recommendations

The PE-51686NL is the direct substitute for the obsolete PE-51686. Both components share identical electrical specifications: 20 A current rating, 50:1 current ratio, 5 mH inductance, and 20kHz–200kHz frequency response. Both employ through-hole mounting with PC pin termination.

The PE-51686NL offers significant advantages for new designs and production transitions:

• Active product status ensures long-term availability and supply chain stability
• RoHS compliance aligns with current regulatory requirements and environmental standards
• Specified DC resistance values (50 Ohm primary, 700 mOhm secondary) provide precise circuit design parameters
• Compact footprint (0.670" × 0.390") reduces PCB space requirements compared to the original

Physical dimensions differ slightly. The PE-51686NL is smaller in length and width but taller when seated. PCB layout verification is necessary to confirm fit within existing mechanical constraints.

Frequently Asked Questions (FAQ)

Q: Can PE-51686NL directly replace PE-51686 in existing designs?

A: Yes. Both components maintain identical electrical performance: 20 A current rating, 50:1 current ratio, 5 mH inductance, and 20kHz–200kHz frequency response. Through-hole mounting and PC pin termination are identical. Physical dimensions differ; verify PCB layout compatibility.

Q: What is the difference between non-invasive and invasive current sense transformers?

A: Non-invasive transformers (PE-51686) use solid core construction and do not require circuit interruption for installation. Invasive transformers (PE-51686NL) require the primary conductor to pass through the core. Both achieve identical 50:1 current ratio and frequency response in this application.

Q: Is PE-51686NL RoHS compliant?

A: Yes. PE-51686NL is RoHS compliant. The original PE-51686 is RoHS non-compliant. This distinction is significant for applications subject to RoHS regulations.

Q: What are the DC resistance specifications?

A: PE-51686NL specifies 50 Ohm primary DC resistance and 700 mOhm secondary DC resistance. The original PE-51686 does not provide DCR specifications. These values are critical for accurate circuit analysis and thermal calculations.

Q: Are there packaging differences?

A: PE-51686NL is supplied in tray packaging. Original packaging for PE-51686 is not specified. Confirm packaging requirements for your procurement and assembly processes.

Q: What is the current inventory status?

A: PE-51686 (obsolete): 808 pieces in stock. PE-51686NL (active): 2100 pieces in stock. PE-51686NL availability supports immediate design transitions and production requirements.