CQ330G Hall Effect Current Sensor - Equivalent & Substitute Parts

Part Overview

The CQ330G is a coreless Hall Effect current sensor manufactured by Asahi Kasei Microdevices (AKM), designed for AC/DC current measurement applications requiring open-loop bidirectional sensing. This component operates with a 4.5A sensing range and delivers ratiometric voltage output, making it suitable for industrial and automotive current monitoring circuits.

The CQ330G is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this sensor.

Substiute Parts

CQ330G

Asahi Kasei Microdevices/AKMIn Stock: 958CQ330G Datasheet

Current PartRFQ

CZ3700

Asahi Kasei Microdevices/AKMIn Stock: 5515CZ3700 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CQ330G is determined by the following critical parameters:

Functional Compatibility Criteria:

• Sensor technology must remain Hall Effect, open-loop architecture
• Output must be ratiometric voltage type
• Bidirectional polarization capability required
• Single-channel configuration
• AC/DC measurement capability

Electrical Compatibility Criteria:

• Supply voltage range: 4.5V ~ 5.5V (identical or overlapping)
• Current sensing range must equal or exceed 4.5A
• Output sensitivity and accuracy must support equivalent circuit integration

Physical Compatibility Criteria:

• Surface mount technology required
• Package footprint and lead configuration must accommodate existing PCB layouts or allow minor redesign

Compliance Criteria:

• RoHS3 compliance required
• Moisture sensitivity level 2A or better

The CZ3700 qualifies as a manufacturer-recommended substitute based on these parameters. While the CZ3700 introduces package and performance variations, it maintains functional equivalence within the allowed electrical and mechanical parameter space for Hall Effect current sensing applications.

Parameter Comparison

Engineering Selection Recommendations

The CZ3700 is the manufacturer-recommended substitute for the obsolete CQ330G. Both components are manufactured by Asahi Kasei Microdevices and maintain ROHS3 compliance with identical moisture sensitivity levels (2A, 4 Weeks).

The CZ3700 offers extended operating temperature range (-40°C to 105°C versus -40°C to 90°C) and higher current sensing capacity (5.3A versus 4.5A), providing improved thermal margin and headroom for current measurement applications. The active product status of the CZ3700 ensures long-term supply chain availability and ongoing manufacturer support.

Primary design consideration: The CZ3700 uses a 16-PowerSOIC package (0.303", 7.70mm Width) compared to the CQ330G's 24-LSSOP package (0.220", 5.60mm Width). PCB layout modification is required to accommodate the different package footprint and lead configuration.

Secondary consideration: Output sensitivity differs (400mV/A for CZ3700 versus 450mV/A for CQ330G). Signal conditioning circuits must be adjusted to account for the 50mV/A reduction in sensitivity to maintain equivalent measurement resolution.

Frequently Asked Questions (FAQ)

Q: Can the CZ3700 directly replace the CQ330G without PCB modification?

A: No. The CZ3700 uses a 16-PowerSOIC package with different physical dimensions and lead spacing compared to the CQ330G's 24-LSSOP package. PCB layout redesign is required.

Q: Are the electrical supply requirements identical?

A: Yes. Both components operate with 4.5V to 5.5V supply voltage and maintain bidirectional Hall Effect sensing with ratiometric voltage output.

Q: What is the impact of the sensitivity difference (450mV/A vs. 400mV/A)?

A: The CZ3700's lower sensitivity requires adjustment of signal conditioning and analog-to-digital conversion scaling factors. Measurement resolution and circuit gain must be recalibrated accordingly.

Q: Does the CZ3700 support the same current measurement range?

A: The CZ3700 supports 5.3A sensing range, which exceeds the CQ330G's 4.5A range. This provides additional headroom for current measurement applications.

Q: Are both components RoHS compliant?

A: Yes. Both the CQ330G and CZ3700 are ROHS3 compliant with identical moisture sensitivity levels (2A, 4 Weeks).

Q: What is the significance of the CZ3700's active product status?

A: Active product status indicates ongoing manufacturer support, continued availability, and long-term supply chain reliability. The obsolete status of the CQ330G makes the CZ3700 the appropriate path for new designs and production continuity.