Bourns 7203 Current Sense Transformer - Equivalent & Substitute Parts

Part Overview

The Bourns 7203 is a current sense transformer rated for 35A unidirectional operation in through-hole mounting configuration. This component is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. Current sense transformers are used in power management circuits to provide galvanic isolation while measuring AC or transient current signals. The 7203's discontinuation requires identification of functionally compatible alternatives that maintain electrical and mechanical compatibility within system constraints.

Substiute Parts

7203

Bourns Inc.In Stock: 11337203 Datasheet

Current PartRFQ

PE-51688NL

Pulse ElectronicsIn Stock: 2282PE-51688NL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Bourns 7203 is based on the following criteria derived from provided specifications:

• Mounting Type: Through-hole configuration required for PCB compatibility
• Current Handling Capacity: Substitute must support the application's current requirements
• Physical Envelope: Dimensions must fit within existing PCB layout constraints
• Regulatory Compliance: RoHS and REACH status for supply chain requirements
• Moisture Sensitivity: MSL rating for storage and assembly process compatibility

The Pulse Electronics PE-51688NL qualifies as a substitute based on matching through-hole mounting, compatible physical dimensions, and equivalent moisture sensitivity rating. However, the PE-51688NL is rated for 20A continuous current, which is lower than the original 7203's 35A rating. This substitution is valid only for applications where the 20A rating meets system requirements.

Parameter Comparison

Engineering Selection Recommendations

The Pulse Electronics PE-51688NL is an active product with current RoHS compliance, providing supply chain continuity for new designs. The primary consideration for substitution is current rating: the PE-51688NL's 20A maximum rating is 57% lower than the Bourns 7203's 35A specification. Selection of this substitute is appropriate only when system current requirements do not exceed 20A continuous operation.

Physical dimensions of the PE-51688NL are slightly smaller than the 7203 (17.01mm vs 19.00mm length; 9.90mm vs 11.00mm width), which may provide layout advantages in space-constrained applications. Height-seated dimensions are nearly identical (20.32mm vs 20.10mm), ensuring compatible PCB stack-up.

The PE-51688NL's RoHS compliance status differs from the non-compliant 7203, which may be advantageous for applications subject to RoHS regulations or customer requirements.

Frequently Asked Questions (FAQ)

Q: Can the PE-51688NL directly replace the Bourns 7203 in all applications?

A: No. The PE-51688NL is rated for 20A maximum current, while the 7203 is rated for 35A. Substitution is valid only when the application's continuous current requirement does not exceed 20A. Exceeding this rating will result in transformer saturation and performance degradation.

Q: Are the physical dimensions compatible?

A: The PE-51688NL is slightly smaller in length and width but maintains nearly identical height. Verify that the smaller footprint (17.01mm x 9.90mm vs 19.00mm x 11.00mm) fits within the existing PCB layout. Height-seated dimensions are compatible.

Q: What is the difference in RoHS compliance?

A: The Bourns 7203 is RoHS non-compliant, while the PE-51688NL is RoHS compliant. For new designs or applications subject to RoHS regulations, the PE-51688NL provides regulatory alignment. Existing designs using the 7203 may continue operation without modification.

Q: Are moisture sensitivity levels equivalent?

A: Yes. Both components have MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or assembly processes.

Q: What are the frequency operating ranges?

A: The PE-51688NL operates across 20kHz to 200kHz. Verify that this frequency range matches the application's signal characteristics before substitution.

Q: How do the electrical parameters compare?

A: The PE-51688NL specifies 200Ohm primary DC resistance, 4.5Ohm secondary DC resistance, 80mH inductance, and 200:1 current ratio. The Bourns 7203 specifications for these parameters were not provided in the available data. Confirm that the PE-51688NL's electrical characteristics are compatible with circuit design requirements.