PB0027 Current Sense Transformer 200:1 35A SMD

Part Overview

The PB0027 is a 35 A current sense transformer with a 200:1 turns ratio, designed for invasive current sensing applications across the 50kHz to 500kHz frequency range. This component features a primary DC resistance of 2.8mOhm and secondary resistance of 2.9Ohm, with an inductance of 22.4 mH. The PB0027 is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement.

Substiute Parts

PB0027

Pulse ElectronicsIn Stock: 1017PB0027 Datasheet

Current PartRFQ

PB0027NL

Pulse ElectronicsIn Stock: 2115PB0027NL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PB0027 is determined by the following critical parameters:

• Current Rating: 35 A (must match exactly)
• Turns Ratio: 200:1 (must match exactly)
• Frequency Range: 50kHz – 500kHz (must match exactly)
• Inductance: 22.4 mH (must match exactly)
• Mounting Type: Surface Mount (must match exactly)
• Termination Style: Gull Wing (must match exactly)
• Height (Seated Max): 0.394" / 10.00mm (must match exactly)

The PB0027NL qualifies as a direct substitute based on these core electrical and mechanical parameters. While the primary DC resistance differs (0.42mOhm vs. 2.8mOhm), the secondary resistance remains constant at 2.9Ohm, and all other critical specifications align with the original component.

Parameter Comparison

Engineering Selection Recommendations

The PB0027NL is the direct substitute for the obsolete PB0027. Selection of the PB0027NL is supported by the following factors:

• Active product status ensures ongoing availability and supply chain continuity
• RoHS compliance of the PB0027NL meets current regulatory requirements, whereas the PB0027 is non-compliant
• All critical electrical parameters (current rating, turns ratio, frequency range, inductance, and secondary resistance) are identical
• Mechanical compatibility is maintained through identical mounting type, termination style, and height specifications
• The reduced primary DC resistance (0.42mOhm vs. 2.8mOhm) in the PB0027NL represents an improvement in efficiency and reduced power dissipation

Frequently Asked Questions (FAQ)

Q: Can the PB0027NL replace the PB0027 in existing designs?

A: Yes. The PB0027NL meets all critical electrical and mechanical specifications of the PB0027. The reduced primary DC resistance is a performance improvement that does not compromise compatibility.

Q: What is the significance of the primary DC resistance difference?

A: The primary DC resistance of 0.42mOhm in the PB0027NL is lower than the 2.8mOhm of the PB0027. This reduction decreases power loss in the primary winding and improves overall transformer efficiency. This change does not affect the core function of current sensing.

Q: Are there packaging differences between these parts?

A: Yes. The PB0027 is supplied in bulk packaging, while the PB0027NL is supplied in trays. Both use identical surface mount gull wing termination and are mechanically interchangeable on PCBs.

Q: Why is the PB0027 obsolete?

A: The PB0027 has been superseded by the PB0027NL, which offers improved performance characteristics and RoHS compliance. New designs should specify the PB0027NL.

Q: Are there any compliance differences?

A: Yes. The PB0027NL is RoHS compliant, while the PB0027 is non-compliant. For applications requiring RoHS compliance, the PB0027NL is the required choice.