CQ3303 Equivalent & Substitute Parts

Part Overview

The CQ3303 is a Hall Effect current sensor manufactured by Asahi Kasei Microdevices (AKM) designed for AC/DC current measurement applications. This component features open-loop bidirectional sensing with a 35A current range and ratiometric voltage output. The CQ3303 is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity. The CZ3703 serves as the primary manufacturer-recommended alternative for new designs and replacement applications.

Substiute Parts

CQ3303

Asahi Kasei Microdevices/AKMIn Stock: 1095CQ3303 Datasheet

Current PartRFQ

CZ3703

Asahi Kasei Microdevices/AKMIn Stock: 1501CZ3703 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The CZ3703 qualifies as a direct substitute for the CQ3303 based on the following critical parameters:

Functional Equivalence Criteria:

• Identical sensor technology: Hall Effect, open-loop architecture
• Matching output configuration: Ratiometric voltage output
• Identical sensitivity specification: 60mV/A
• Matching supply voltage range: 4.5V ~ 5.5V
• Identical polarization: Bidirectional current sensing
• Equivalent current sensing capability: 36A (CZ3703) vs. 35A (CQ3303)
• Identical channel count: 1 channel
• Surface mount technology compatibility

Substitution Basis: The CZ3703 maintains functional and electrical compatibility with the CQ3303 across all primary sensing parameters. Both components operate within the same supply voltage window, deliver identical sensitivity characteristics, and support bidirectional AC/DC current measurement. The CZ3703's 36A rating provides equivalent or superior current handling compared to the CQ3303's 35A specification. Both devices are RoHS3 compliant and share identical moisture sensitivity levels.

Parameter Comparison

Engineering Selection Recommendations

For Obsolete Part Replacement: The CQ3303 is classified as obsolete. The CZ3703 is the manufacturer-recommended substitute and is actively produced, ensuring long-term availability and supply chain continuity.

Electrical Compatibility: Both components operate within identical supply voltage specifications (4.5V ~ 5.5V) and deliver matching sensitivity (60mV/A). The CZ3703 maintains functional equivalence for AC/DC current measurement applications requiring bidirectional sensing.

Performance Considerations: The CZ3703 provides improved linearity (±0.13% vs. ±0.6%) and extended operating temperature range (-40°C ~ 105°C vs. -40°C ~ 90°C). The CQ3303 offers faster response time (0.5µs vs. 1µs) and lower supply current consumption (11mA vs. 25mA). The CZ3703 supports higher current sensing (36A vs. 35A).

Package and PCB Layout: The CZ3703 uses a 16-PowerSOIC package (0.303", 7.70mm width) compared to the CQ3303's 24-LSSOP package (0.220", 5.60mm width). PCB layout modifications are required for substitution. Both packages maintain 10-lead configurations.

Compliance: Both components are RoHS3 compliant with identical moisture sensitivity levels (2A, 4 weeks), supporting equivalent environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the CZ3703 directly replace the CQ3303 without circuit modifications?

A: The CZ3703 provides electrical and functional equivalence but requires PCB layout changes due to different package footprints. The CQ3303 uses 24-LSSOP packaging while the CZ3703 uses 16-PowerSOIC packaging. Pin configuration and lead spacing differ, necessitating PCB redesign.

Q: What are the key electrical differences between these parts?

A: Both components share identical sensitivity (60mV/A), supply voltage range (4.5V ~ 5.5V), output type (ratiometric voltage), and polarization (bidirectional). The CZ3703 offers improved linearity (±0.13% vs. ±0.6%) and extended temperature range (-40°C ~ 105°C vs. -40°C ~ 90°C). The CQ3303 provides faster response time (0.5µs vs. 1µs) and lower supply current (11mA vs. 25mA).

Q: Why is the CQ3303 obsolete?

A: The CQ3303 is classified as obsolete by the manufacturer. The CZ3703 represents the current-generation alternative for new designs and production applications.

Q: Are both parts RoHS compliant?

A: Yes, both the CQ3303 and CZ3703 are RoHS3 compliant with identical moisture sensitivity levels (2A, 4 weeks).

Q: What is the current sensing capability difference?

A: The CQ3303 supports 35A sensing while the CZ3703 supports 36A sensing. This difference is negligible for most applications, with the CZ3703 providing equivalent or superior current handling.

Q: Can I use the CZ3703 in applications requiring the CQ3303's faster response time?

A: The CQ3303 has a 0.5µs response time compared to the CZ3703's 1µs response time. For applications with strict response time requirements below 1µs, the CZ3703 may not be suitable. Evaluate your circuit's timing requirements before substitution.

Q: What supply current should I budget for the CZ3703?

A: The CZ3703 draws a maximum of 25mA supply current compared to the CQ3303's 11mA. Verify that your power supply design accommodates this higher current draw.