LTSR 15-NP Current Sensor Equivalent & Substitute Parts

Part Overview

The LTSR 15-NP is a 15A Hall Effect closed-loop bidirectional current sensor manufactured by LEM USA Inc. This single-channel module features ratiometric voltage output and is designed for AC/DC current measurement applications. The product is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. The LTSR 15-NP operates across a wide frequency range (DC to 200kHz) with high linearity (±0.1%) and accuracy (±0.2%), suitable for precision current monitoring in industrial and power management applications.

Key Parameters

Parameter	Value
Current Sensing Range	15A
Measurement Type	AC/DC
Sensor Technology	Hall Effect, Closed Loop
Number of Channels	1
Output Type	Ratiometric, Voltage
Sensitivity	41.6mV/A
Frequency Range	DC ~ 200kHz
Linearity	±0.1%
Accuracy	±0.2%
Supply Voltage	5V
Operating Temperature	-40°C ~ 85°C
Polarization	Bidirectional
Mounting Type	Through Hole
Package Type	Module, Single Pass Through
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the LTSR 15-NP are identified based on strict parameter alignment within the 15A current sensor category. The substitution logic is based on the following critical parameters:

Primary Matching Criteria:

Current sensing capacity: 15A
Measurement capability: AC/DC
Number of channels: 1
Output configuration: Ratiometric voltage
Operating temperature range: -40°C ~ 85°C
Mounting type: Through Hole
Compliance: RoHS and REACH standards

Acceptable Variation Parameters:

Sensor technology (Hall Effect vs. Flux Gate vs. Closed Loop variants)
Sensitivity tolerance (within ±5% of 41.6mV/A baseline)
Frequency response (minimum DC ~ 200kHz or equivalent)
Linearity and accuracy specifications (within ±1% and ±0.8% respectively)
Supply voltage range (4.75V ~ 5.25V acceptable for 5V nominal)
Response time (faster response acceptable)
Polarization (unidirectional acceptable for bidirectional applications)

The identified substitutes meet these criteria while maintaining functional equivalence for current measurement applications.

Parameter Comparison

Parameter	LTSR 15-NP	CASR 15-NP	T60404N4647X662
Manufacturer	LEM USA Inc.	LEM USA Inc.	VACUUMSCHMELZE
Current Sensing	15A	15A	15A
Measurement Type	AC/DC	AC/DC	AC/DC
Sensor Type	Hall Effect, Closed Loop	Flux Gate, Closed Loop	Closed Loop
Number of Channels	1	1	1
Output	Ratiometric, Voltage	Ratiometric, Voltage	Ratiometric, Voltage
Sensitivity	41.6mV/A	41.67mV/A	Not specified
Frequency Range	DC ~ 200kHz	300kHz	DC ~ 200kHz
Linearity	±0.1%	±1%	±0.1%
Accuracy	±0.2%	±0.8%	±0.7%
Supply Voltage	5V	4.75V ~ 5.25V	4.75V ~ 5.25V
Response Time	0.4µs	0.3µs	300ns
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Polarization	Bidirectional	Bidirectional	Unidirectional
Mounting Type	Through Hole	Through Hole	Through Hole
Package Type	Module, Single Pass Through	Module	10-DIP Module
Product Status	Obsolete	Active	Active
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

CASR 15-NP (LEM USA Inc.) - Primary Substitute

The CASR 15-NP is the recommended primary substitute for the obsolete LTSR 15-NP. Both parts are manufactured by LEM USA Inc. and share identical current sensing capacity (15A), channel configuration (1 channel), output type (ratiometric voltage), and operating temperature range (-40°C ~ 85°C). The CASR 15-NP uses Flux Gate technology instead of Hall Effect, providing enhanced frequency response (300kHz vs. 200kHz). The CASR 15-NP maintains active product status, ensuring long-term availability and supply chain continuity. Sensitivity specifications are nearly identical (41.67mV/A vs. 41.6mV/A). Both parts are RoHS Compliant and REACH Unaffected. The CASR 15-NP features improved response time (0.3µs vs. 0.4µs) and operates with a wider supply voltage range (4.75V ~ 5.25V). Linearity tolerance is ±1% and accuracy is ±0.8%, representing acceptable trade-offs for an active, readily available component.

T60404N4647X662 (VACUUMSCHMELZE) - Secondary Substitute

The T60404N4647X662 serves as a secondary substitute option, manufactured by VACUUMSCHMELZE. This part matches the 15A current sensing capacity, AC/DC measurement capability, single-channel configuration, and ratiometric voltage output. Operating temperature range (-40°C ~ 85°C) and frequency response (DC ~ 200kHz) are identical to the LTSR 15-NP. The T60404N4647X662 achieves superior linearity (±0.1%, matching the original) and offers significantly faster response time (300ns vs. 0.4µs). Supply voltage range is 4.75V ~ 5.25V. The primary distinction is unidirectional polarization versus the LTSR 15-NP's bidirectional capability; this substitution is suitable only for applications requiring unidirectional current measurement. The T60404N4647X662 is ROHS3 Compliant and REACH Unaffected, with active product status ensuring availability.

Selection Criteria Summary:

For bidirectional current measurement applications: CASR 15-NP is the appropriate choice
For unidirectional current measurement applications: T60404N4647X662 is acceptable
Both substitutes provide active product status, ensuring supply chain reliability
Both substitutes maintain compliance with RoHS and REACH regulations
Packaging differences (tray vs. box vs. single pass through) should be evaluated against assembly requirements

Frequently Asked Questions (FAQ)

Q: Can the CASR 15-NP directly replace the LTSR 15-NP in existing designs?

A: The CASR 15-NP is functionally equivalent for 15A AC/DC current measurement applications. Both parts share identical current sensing capacity, channel configuration, output type, and operating temperature range. The primary difference is sensor technology (Flux Gate vs. Hall Effect). Verification of frequency response requirements and sensitivity tolerance in your specific application is necessary before implementation.

Q: What is the key difference between the LTSR 15-NP and T60404N4647X662?

A: The primary difference is polarization: the LTSR 15-NP is bidirectional, while the T60404N4647X662 is unidirectional. The T60404N4647X662 is suitable only for applications measuring current in a single direction. Both parts share identical frequency range (DC ~ 200kHz) and linearity (±0.1%).

Q: Are there packaging compatibility issues when substituting these parts?

A: Yes. The LTSR 15-NP uses a single pass-through module package, the CASR 15-NP uses a standard module package, and the T60404N4647X662 uses a 10-DIP module package. PCB layout and mounting hole configurations must be verified for compatibility with your application.

Q: Do all three parts meet current compliance standards?

A: Yes. The LTSR 15-NP and CASR 15-NP are RoHS Compliant. The T60404N4647X662 is ROHS3 Compliant. All three parts are REACH Unaffected. All parts carry EAR99 ECCN classification.

Q: What is the sensitivity difference between these parts?

A: The LTSR 15-NP and CASR 15-NP have nearly identical sensitivity (41.6mV/A and 41.67mV/A respectively), representing a 0.02% difference. The T60404N4647X662 sensitivity is not specified in available documentation.

Q: Which substitute offers the fastest response time?

A: The T60404N4647X662 provides the fastest response time at 300ns, compared to 0.4µs for the LTSR 15-NP and 0.3µs for the CASR 15-NP.

Q: Can I use the CASR 15-NP in applications requiring bidirectional measurement?

A: Yes. The CASR 15-NP is bidirectional, matching the LTSR 15-NP's polarization capability. This makes it suitable for applications requiring current measurement in both directions.

Q: What supply voltage range should I use for these parts?

A: The LTSR 15-NP requires 5V nominal supply. The CASR 15-NP and T60404N4647X662 accept a wider range of 4.75V ~ 5.25V, providing greater design flexibility.

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