LTSR 25-NP Current Sensor Equivalent & Substitute Parts

Part Overview

The LTSR 25-NP is a Hall Effect closed-loop current sensor manufactured by LEM USA Inc., designed for AC/DC current measurement applications with a 25A sensing range. This component features a single-channel configuration with ratiometric voltage output and bidirectional polarization capability. The product is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new design implementations. Substitute parts must maintain compatibility across critical electrical parameters including current sensing range, output characteristics, supply voltage, and operating temperature specifications.

Substiute Parts

LTSR 25-NP

LEM USA Inc.In Stock: 5913LTSR 25-NP Datasheet

Current PartRFQ

CASR 25-NP

LEM USA Inc.In Stock: 40847CASR 25-NP Datasheet

DirectRFQ

T60404N4647X661

VACUUMSCHMELZEIn Stock: 1183T60404N4647X661 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTSR 25-NP is determined by strict alignment with the following critical parameters:

Primary Compatibility Criteria:

• Current sensing capacity: 25A
• Measurement capability: AC/DC
• Closed-loop sensor architecture
• Single-channel configuration
• Ratiometric voltage output
• Operating temperature range: -40°C to 85°C minimum
• Through-hole mounting compatibility
• Supply voltage compatibility with 5V nominal operation

Identified Substitutes:

CASR 25-NP (LEM USA Inc.): Qualifies as a direct substitute based on identical current sensing range (25A), AC/DC measurement capability, closed-loop architecture, single-channel design, ratiometric voltage output, matching operating temperature range (-40°C to 85°C), through-hole mounting, and compatible supply voltage specification (4.75V ~ 5.25V encompasses 5V nominal). Sensor technology differs (Flux Gate vs. Hall Effect) but maintains equivalent functional performance within specified parameters.

T60404N4647X661 (VACUUMSCHMELZE): Qualifies as a substitute based on 25A current sensing range, AC/DC measurement capability, closed-loop architecture, single-channel configuration, ratiometric voltage output, matching operating temperature range (-40°C to 85°C), through-hole mounting, and compatible supply voltage (4.75V ~ 5.25V). Polarization is unidirectional rather than bidirectional; this represents a functional constraint requiring application-level verification for directional current measurement requirements.

Parameter Comparison

Engineering Selection Recommendations

CASR 25-NP Selection Rationale:

The CASR 25-NP represents the primary substitute for LTSR 25-NP applications. Both components are manufactured by LEM USA Inc., ensuring design continuity and supply chain consistency. The CASR 25-NP maintains active product status, providing long-term availability and manufacturing support. Electrical parameters align within acceptable tolerances: identical 25A current sensing, matching AC/DC measurement capability, equivalent operating temperature range, and compatible supply voltage specification. The CASR 25-NP demonstrates superior frequency response (300 kHz vs. 200 kHz) and faster response time (0.3 µs vs. 0.4 µs), representing performance enhancement. Sensor technology transition from Hall Effect to Flux Gate does not compromise functional equivalence within the specified parameter set. Both components carry RoHS compliance and REACH unaffected status, satisfying regulatory requirements. Packaging format (Tray) supports production-scale implementation.

T60404N4647X661 Selection Rationale:

The T60404N4647X661 qualifies as a secondary substitute when CASR 25-NP availability is constrained. This component maintains 25A current sensing, AC/DC measurement capability, and matching operating temperature range. Electrical performance characteristics include linearity (±0.1%) and accuracy (±0.7%) within acceptable substitution parameters. Response time (300 ns) exceeds LTSR 25-NP performance. Supply voltage specification (4.75V ~ 5.25V) provides compatible operation. ROHS3 compliance satisfies regulatory requirements. Critical constraint: unidirectional polarization limits application scope to single-direction current measurement. Applications requiring bidirectional current sensing must employ CASR 25-NP. Package format (10-DIP Module) differs from original single pass-through configuration, requiring PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can CASR 25-NP directly replace LTSR 25-NP in existing designs?

A: Yes. Both components share identical current sensing range (25A), AC/DC measurement capability, single-channel configuration, ratiometric voltage output, operating temperature range (-40°C to 85°C), and through-hole mounting. Supply voltage compatibility (5V nominal operation within 4.75V ~ 5.25V specification) is confirmed. Sensor technology differs (Flux Gate vs. Hall Effect), but functional performance remains equivalent within specified parameters. Physical package dimensions require verification for PCB layout compatibility.

Q: What is the primary limitation of T60404N4647X661 as a substitute?

A: The T60404N4647X661 operates with unidirectional polarization, whereas LTSR 25-NP supports bidirectional measurement. Applications requiring bidirectional current sensing (measurement of current flow in both directions) cannot use this substitute. Unidirectional operation restricts measurement to single-direction current flow only. Verify application current flow requirements before selection.

Q: Are there packaging differences between substitute parts?

A: Yes. LTSR 25-NP uses a single pass-through module package. CASR 25-NP uses a standard module package in tray format. T60404N4647X661 uses a 10-DIP module package. Physical dimensions, pin configuration, and PCB footprint differ. Mechanical compatibility and PCB layout must be verified for each substitute before implementation.

Q: Do all substitute parts meet regulatory compliance requirements?

A: CASR 25-NP carries RoHS compliance and REACH unaffected status, matching LTSR 25-NP certifications. T60404N4647X661 carries ROHS3 compliance. Both substitutes satisfy RoHS requirements. REACH status for T60404N4647X661 is not specified in available documentation. Regulatory compliance verification is required for applications subject to specific regional requirements.

Q: How do accuracy specifications compare across parts?

A: LTSR 25-NP specifies ±0.2% accuracy. CASR 25-NP specifies ±0.8% accuracy. T60404N4647X661 specifies ±0.7% accuracy. LTSR 25-NP provides superior accuracy performance. Applications with strict accuracy requirements (±0.2% or better) may require design-level evaluation of substitute performance impact. CASR 25-NP and T60404N4647X661 remain functionally equivalent for applications tolerating ±0.8% or ±0.7% accuracy respectively.

Q: What is the frequency response difference between LTSR 25-NP and CASR 25-NP?

A: LTSR 25-NP supports DC ~ 200 kHz frequency response. CASR 25-NP supports 300 kHz frequency response. CASR 25-NP provides extended high-frequency capability. Applications operating within 200 kHz bandwidth experience no functional difference. Applications requiring frequency response above 200 kHz benefit from CASR 25-NP enhanced specification.

Q: Can supply voltage variation affect substitute part selection?

A: LTSR 25-NP specifies 5V nominal supply. CASR 25-NP and T60404N4647X661 specify 4.75V ~ 5.25V supply range. Both substitutes tolerate wider voltage variation, providing improved supply regulation tolerance. Systems operating at strict 5V nominal with minimal variation experience no functional difference. Systems with supply voltage variation within 4.75V ~ 5.25V range benefit from substitute part tolerance specification.