CQ3203 Equivalent & Substitute Parts

Part Overview

The CQ3203 is a coreless current sensor manufactured by Asahi Kasei Microdevices (AKM) designed for AC/DC current measurement applications. It features Hall Effect open-loop technology with bidirectional sensing capability and a 35.7A sensing range. The device operates on a 3.3V supply and delivers ratiometric voltage output with 37mV/A sensitivity.

The CQ3203 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

CQ3203

Asahi Kasei Microdevices/AKMIn Stock: 1194CQ3203 Datasheet

Current PartRFQ

CZ3A04

Asahi Kasei Microdevices/AKMIn Stock: 1684CZ3A04 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CQ3203 is determined by the following critical parameters:

• Sensor technology: Hall Effect, open-loop topology
• Measurement capability: AC/DC bidirectional current sensing
• Output interface: Voltage output (ratiometric preferred)
• Supply voltage compatibility: 3.3V nominal operation
• Current sensing range: Minimum 32.2A to 35.7A
• Single-channel configuration
• Surface mount packaging suitable for PCB integration
• Operating temperature range: Minimum -40°C to 85°C
• RoHS3 compliance and equivalent regulatory certifications

The CZ3A04 meets these substitution criteria as an active product from the same manufacturer (AKM) within the CZ series, offering compatible Hall Effect open-loop current sensing with bidirectional measurement, voltage output, and surface mount packaging.

Parameter Comparison

Engineering Selection Recommendations

The CZ3A04 is the manufacturer-recommended substitute for the obsolete CQ3203. Both devices are ROHS3 compliant and manufactured by AKM, ensuring regulatory equivalence.

Key considerations for substitution:

• Package footprint change from 24-LSSOP to 16-PowerSOIC requires PCB layout modification
• Sensitivity increase (48mV/A vs. 37mV/A) necessitates signal conditioning or firmware adjustment in measurement circuits
• Maximum supply current increases from 6.2mA to 16mA typical, requiring power budget verification
• Response time doubles from 0.5µs to 1µs; verify timing requirements in high-speed applications
• Accuracy specification widens from ±1.3% to ±2.1%; confirm acceptable measurement tolerance
• Operating temperature maximum decreases from 90°C to 85°C; verify thermal environment compatibility
• Current sensing range decreases from 35.7A to 32.2A; confirm measurement ceiling is not exceeded

The CZ3A04 is suitable for applications where the CQ3203 was previously used, provided design modifications address the parameter differences listed above.

Frequently Asked Questions (FAQ)

Q: Can the CZ3A04 directly replace the CQ3203 without PCB modifications?

A: No. The CZ3A04 uses a different package (16-PowerSOIC vs. 24-LSSOP) with different pin configurations and footprints. PCB layout redesign is required. Additionally, the higher sensitivity (48mV/A vs. 37mV/A) requires signal conditioning adjustments.

Q: What is the primary reason for substitution?

A: The CQ3203 is obsolete. The CZ3A04 is the active equivalent from the same manufacturer, ensuring continued supply and support.

Q: Are both devices RoHS compliant?

A: Yes. Both the CQ3203 and CZ3A04 are ROHS3 compliant, meeting equivalent environmental and regulatory standards.

Q: How does the sensitivity difference affect circuit design?

A: The CZ3A04 produces 48mV per ampere compared to 37mV per ampere for the CQ3203. This 30% increase in sensitivity means the output voltage will be proportionally higher for the same input current. Analog-to-digital converter (ADC) scaling, amplifier gain, or firmware calibration must be adjusted accordingly.

Q: Is the CZ3A04 suitable for high-temperature applications?

A: The CZ3A04 operates to 85°C maximum, compared to 90°C for the CQ3203. If the application requires operation above 85°C, the CZ3A04 is not suitable without thermal management modifications.

Q: What is the impact of the response time difference?

A: The CQ3203 responds in 0.5µs while the CZ3A04 responds in 1µs. For applications requiring sub-microsecond measurement updates or high-frequency current transient detection, this 2x increase in response time may be significant. Verify timing requirements in your application.

Q: Can the CZ3A04 measure the same maximum current as the CQ3203?

A: No. The CZ3A04 has a 32.2A sensing range compared to 35.7A for the CQ3203. If your application requires measurement of currents above 32.2A, the CZ3A04 cannot be used without design modification.

Q: What is the supply current difference and why does it matter?

A: The CQ3203 draws 6.2mA maximum while the CZ3A04 draws 16mA typical. This 2.6x increase affects power supply design, thermal dissipation, and battery life in portable applications. Verify your power budget can accommodate this increase.

Q: Are there any other AKM Hall Effect current sensors available as alternatives?

A: This reference covers only the manufacturer-recommended substitute (CZ3A04) based on the provided data. Consult AKM product documentation for additional options within the CZ series or other current sensor families.