L18P040D15 Hall Effect Current Sensor - Equivalent & Substitute Parts

Part Overview

The L18P040D15 is a Hall Effect open-loop bidirectional current sensor manufactured by Tamura, designed for AC/DC current measurement applications up to 40A. This component features a single-channel ratiometric voltage output with ±1% linearity and operates across a frequency range of DC to 100kHz. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	L18P040D15
Manufacturer	Tamura
Sensor Type	Hall Effect, Open Loop
Current - Sensing	40A
Number of Channels	1
Output Type	Ratiometric, Voltage
Frequency Range	DC ~ 100kHz
Linearity	±1%
Voltage - Supply	±15V
Response Time	5µs
Current - Supply (Max)	15mA
Operating Temperature	-30°C ~ 80°C
Polarization	Bidirectional
Mounting Type	Through Hole
Package / Case	Module
Product Status	Obsolete
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the L18P040D15 is determined by the following critical parameters:

Primary Substitution Criteria:

Sensor Type: Hall Effect, Open Loop
Output Type: Ratiometric, Voltage
Number of Channels: 1
Polarization: Bidirectional
Mounting Type: Through Hole
Package / Case: Module
Linearity: ±1%
Response Time: 5µs
Operating Temperature: -30°C ~ 80°C
RoHS Compliance: Required

Current-Sensing Range Compatibility: The L18P040D15 operates at 40A. Substitute parts are grouped by current-sensing capability. Parts with lower current ratings (3A, 5A, 10A, 25A) function as parametric equivalents within the same sensor family and maintain identical electrical and mechanical characteristics except for current measurement range.

Supply Voltage Consideration: The primary substitute L18P040D15-OP accepts ±12V ~ 15V supply voltage, providing broader compatibility than the original ±15V specification while maintaining all other functional parameters.

Parameter Comparison

Parameter	L18P040D15	L18P040D15-OP	L18P025D15	L18P010D15	L18P005D15	L18P003D15
Manufacturer	Tamura	Tamura	Tamura	Tamura	Tamura	Tamura
Sensor Type	Hall Effect, Open Loop	Hall Effect, Open Loop	Hall Effect, Open Loop	Hall Effect, Open Loop	Hall Effect, Open Loop	Hall Effect, Open Loop
Current - Sensing	40A	40A	25A	10A	5A	3A
Number of Channels	1	1	1	1	1	1
Output Type	Ratiometric, Voltage	Ratiometric, Voltage	Ratiometric, Voltage	Ratiometric, Voltage	Ratiometric, Voltage	Ratiometric, Voltage
Frequency Range	DC ~ 100kHz	Not specified	DC ~ 100kHz	DC ~ 100kHz	DC ~ 100kHz	DC ~ 100kHz
Linearity	±1%	±1%	±1%	±1%	±1%	±1%
Voltage - Supply	±15V	±12V ~ 15V	±15V	±15V	±15V	±15V
Response Time	5µs	5µs	5µs	5µs	5µs	5µs
Current - Supply (Max)	15mA	18mA	15mA	15mA	15mA	15mA
Operating Temperature	-30°C ~ 80°C	-30°C ~ 80°C	-30°C ~ 80°C	-30°C ~ 80°C	-30°C ~ 80°C	-30°C ~ 80°C
Polarization	Bidirectional	Bidirectional	Bidirectional	Bidirectional	Bidirectional	Bidirectional
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Module	Module	Module	Module	Module	Module
Product Status	Obsolete	Active	Obsolete	Obsolete	Obsolete	Obsolete
RoHS Status	RoHS Compliant	Not specified	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant

Engineering Selection Recommendations

Primary Recommendation: L18P040D15-OP

The L18P040D15-OP is the manufacturer-recommended direct substitute for the obsolete L18P040D15. This part maintains identical current-sensing capability (40A) and all critical functional parameters including Hall Effect open-loop topology, ratiometric voltage output, ±1% linearity, 5µs response time, and bidirectional polarization. The L18P040D15-OP features an active product status, ensuring long-term availability and supply chain continuity. The supply voltage specification of ±12V ~ 15V provides enhanced flexibility compared to the original ±15V requirement. Maximum supply current increases from 15mA to 18mA, which remains within typical power budget constraints for most applications.

Secondary Recommendations: L18P025D15, L18P010D15, L18P005D15, L18P003D15

These parts are parametric equivalents within the L18PXXXD15 series, sharing identical electrical characteristics and mechanical form factor. Selection among these lower-current-rated alternatives is appropriate only when application requirements permit reduced current-sensing range. All maintain ±1% linearity, 5µs response time, DC to 100kHz frequency capability, and RoHS compliance. These parts are classified as obsolete; however, inventory availability is documented.

Compliance Considerations:

All recommended substitutes maintain RoHS compliance status. The L18P040D15-OP is the only active-status component in this substitution group, making it the preferred choice for new designs and long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can the L18P040D15-OP directly replace the L18P040D15 without circuit modification?

A: Yes. The L18P040D15-OP is the manufacturer-recommended substitute with identical current-sensing range (40A), output type (ratiometric voltage), response time (5µs), and operating temperature range (-30°C ~ 80°C). The supply voltage specification of ±12V ~ 15V is compatible with standard ±15V supplies. No circuit redesign is required.

Q: What is the difference between the L18P040D15 and L18P040D15-OP?

A: The primary differences are product status and supply voltage specification. The L18P040D15-OP is active, ensuring ongoing availability. The supply voltage range is ±12V ~ 15V versus ±15V, providing broader operational flexibility. Maximum supply current increases from 15mA to 18mA. All other parameters remain identical.

Q: Can lower-current-rated parts (L18P025D15, L18P010D15, L18P005D15, L18P003D15) substitute for the L18P040D15?

A: These parts are parametric equivalents within the same sensor family and share identical electrical characteristics and mechanical form factor. However, they are rated for lower maximum current measurement (25A, 10A, 5A, and 3A respectively). Substitution is appropriate only when application current requirements do not exceed the lower-rated part's specification. Exceeding the rated current range will result in measurement error and potential component damage.

Q: Are all substitute parts RoHS compliant?

A: The L18P040D15, L18P025D15, L18P010D15, L18P005D15, and L18P003D15 are documented as RoHS compliant. RoHS status for the L18P040D15-OP is not specified in available documentation.

Q: What is the frequency response capability of these sensors?

A: The L18P040D15 and all lower-current parametric equivalents (L18P025D15, L18P010D15, L18P005D15, L18P003D15) operate across DC to 100kHz frequency range. The L18P040D15-OP frequency specification is not provided in available data.

Q: Are these sensors suitable for both AC and DC current measurement?

A: Yes. All parts in this substitution group are specified for AC/DC current measurement. The bidirectional polarization enables measurement of current flow in both directions.

Q: What is the mounting configuration for these sensors?

A: All parts are through-hole mounted modules. No surface-mount alternatives are available within this substitution group.

Q: How does the response time of 5µs affect application performance?

A: The 5µs response time is consistent across all parts in this group. This specification indicates the sensor's ability to detect and respond to current changes. Applications requiring faster response times must evaluate alternative sensor technologies outside this product family.

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