CR4420-0.5 Current Sensor Equivalent & Substitute Parts

Part Overview

The CR4420-0.5 is a current transformer sensor manufactured by CR Magnetics Inc., designed for AC current measurement applications with a 500mA sensing range. This component features a single-channel transformer with integrated conditioning circuitry, delivering ratiometric output in the 4mA to 20mA range. The CR4420-0.5 is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing system support. Substitute parts must maintain identical electrical performance characteristics and mechanical compatibility to ensure seamless integration into existing applications.

Key Parameters

Parameter	Value
Current Sensing Range	500mA
Number of Channels	1
Output Type	Ratiometric, 4mA ~ 20mA
Measurement Type	AC
Sensor Type	Transformer w/Conditioning
Supply Voltage	24V
Accuracy	±0.5%
Operating Temperature Range	0°C ~ 60°C
Polarization	Bidirectional
Mounting Type	DIN Rail, Panel
Package Type	Module
Response Time	250ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CR4420-0.5 is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

Current sensing range: 500mA
Number of channels: 1
Output specification: Ratiometric, 4mA ~ 20mA
Measurement type: AC
Sensor type: Transformer w/Conditioning
Supply voltage: 24V
Accuracy: ±0.5%
Operating temperature range: 0°C ~ 60°C
Polarization: Bidirectional
Package type: Module
Response time: 250ms

Allowable Variation Parameters:

Frequency range (provided substitute maintains minimum 50Hz ~ 400Hz coverage)
Mounting type (DIN Rail and/or Panel mounting acceptable)
Maximum supply current (within component design limits)
Product status (Active substitutes preferred for obsolete main part)
Packaging format (Bulk acceptable for module-type components)

Three substitute parts meet these criteria and are classified by substitution type.

Parameter Comparison

Parameter	CR4420-0.5 (Main)	CR4120-0.5	CR4220-0.5	CR4420S-0.5
Manufacturer	CR Magnetics Inc.	CR Magnetics Inc.	CR Magnetics Inc.	CR Magnetics Inc.
Series	CR4400	CR4100	CR4200	CR4400
Product Status	Obsolete	Active	Active	Active
Current Sensing	500mA	500mA	500mA	500mA
Number of Channels	1	1	1	1
Output	Ratiometric, 4mA ~ 20mA	Ratiometric, 4mA ~ 20mA	Ratiometric, 4mA ~ 20mA	Ratiometric, 4mA ~ 20mA
For Measuring	AC	AC	AC	AC
Sensor Type	Transformer w/Conditioning	Transformer w/Conditioning	Transformer w/Conditioning	Transformer w/Conditioning
Frequency Range	50Hz ~ 400Hz	20Hz ~ 5kHz	50Hz ~ 400Hz	50Hz ~ 400Hz
Accuracy	±0.5%	±0.5%	±0.5%	±0.5%
Supply Voltage	24V	24V	24V	24V
Response Time	250ms	250ms	250ms	250ms
Max Supply Current	45mA	40mA	Not specified	45mA
Operating Temperature	0°C ~ 60°C	0°C ~ 60°C	0°C ~ 60°C	0°C ~ 60°C
Polarization	Bidirectional	Bidirectional	Bidirectional	Bidirectional
Mounting Type	DIN Rail, Panel	DIN Rail, Panel	DIN Rail	DIN Rail, Panel
Package / Case	Module	Module	Module	Module
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99	EAR99
HTSUS Code	9030.33.3400	9030.33.3400	9030.33.3400	9030.33.3400

Engineering Selection Recommendations

CR4420S-0.5 (Parametric Equivalent - Preferred Primary Substitute)

The CR4420S-0.5 is the optimal substitute for the obsolete CR4420-0.5. Both components belong to the CR4400 series and share identical electrical specifications, including current sensing range, output characteristics, frequency response, accuracy, and supply requirements. The CR4420S-0.5 maintains active product status, ensuring long-term availability and supply chain continuity. Maximum supply current specification (45mA) matches the original part exactly. Mounting flexibility (DIN Rail and Panel) and module packaging are preserved. All regulatory compliance certifications (ROHS3, REACH Unaffected, EAR99) are maintained. This part provides direct functional replacement with no design modifications required.

CR4220-0.5 (Manufacturer Recommended Substitute)

The CR4220-0.5, from the CR4200 series, meets all mandatory electrical parameters and is designated as manufacturer-recommended. Frequency range (50Hz ~ 400Hz) matches the original specification. All other critical parameters including accuracy, supply voltage, response time, operating temperature, and polarization are identical. The component is active and available. Mounting capability is limited to DIN Rail only, which may require mechanical redesign if panel mounting was utilized in the original application. Maximum supply current is not specified for this part. This substitute is suitable for applications where DIN Rail mounting is the primary or exclusive mounting method.

CR4120-0.5 (Direct Manufacturer Equivalent)

The CR4120-0.5, from the CR4100 series, satisfies all mandatory electrical parameters for substitution. This part is active and available. Frequency range extends to 5kHz, providing broader operational bandwidth than the original 50Hz ~ 400Hz specification. Maximum supply current is specified at 40mA, which is 5mA lower than the original 45mA rating. Mounting options (DIN Rail and Panel) match the original part. This substitute is suitable for applications where extended frequency response is beneficial or where the reduced maximum supply current does not exceed system requirements. The wider frequency range may provide enhanced performance in applications with higher frequency AC current components.

All three substitutes maintain ROHS3 compliance, REACH unaffected status, and identical ECCN/HTSUS classifications, ensuring regulatory and trade compliance equivalence.

Frequently Asked Questions (FAQ)

Q: Can CR4420S-0.5 be used as a direct replacement for CR4420-0.5 without any modifications?

A: Yes. The CR4420S-0.5 is a parametric equivalent with identical electrical specifications, supply voltage, accuracy, response time, and mounting options. No design modifications are required for direct substitution.

Q: What is the key difference between CR4220-0.5 and CR4420-0.5?

A: The CR4220-0.5 differs in mounting capability, offering DIN Rail mounting only, whereas the CR4420-0.5 supports both DIN Rail and Panel mounting. All electrical parameters are identical. Applications requiring panel mounting must use CR4420S-0.5 or CR4120-0.5.

Q: Why does CR4120-0.5 have a wider frequency range (20Hz ~ 5kHz) compared to the original CR4420-0.5 (50Hz ~ 400Hz)?

A: The CR4120-0.5 is from a different series (CR4100) with enhanced frequency response capability. The wider range does not affect substitution eligibility, as it encompasses the original 50Hz ~ 400Hz specification. Applications operating within the original frequency band will function identically.

Q: Is the 5mA difference in maximum supply current (CR4120-0.5 at 40mA vs. CR4420-0.5 at 45mA) significant for substitution?

A: The maximum supply current specification indicates the component's power consumption capability. If the original application draws less than 40mA, the CR4120-0.5 is suitable. If the application requires the full 45mA capacity, use CR4420S-0.5 instead.

Q: Are all three substitutes available in the same packaging format as the original CR4420-0.5?

A: All three substitutes are supplied in Bulk packaging as modules. The original CR4420-0.5 was supplied with unspecified packaging. All maintain identical module package type and form factor.

Q: Do all substitutes maintain the same regulatory compliance as the original part?

A: Yes. All three substitutes (CR4120-0.5, CR4220-0.5, CR4420S-0.5) are ROHS3 compliant, REACH unaffected, and classified as EAR99 with identical HTSUS code 9030.33.3400. Regulatory equivalence is maintained across all substitutes.

Q: Which substitute should be selected for new designs?

A: CR4420S-0.5 is recommended for new designs. It is active, maintains all original specifications including dual mounting capability, and provides the longest product lifecycle support as a current-generation component within the CR4400 series.

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