CQ330F Hall Effect Current Sensor - Equivalent & Substitute Parts

Part Overview

The CQ330F is a Hall Effect current sensor manufactured by Asahi Kasei Microdevices (AKM) designed for AC/DC current measurement applications. This open-loop, bidirectional sensor provides ratiometric voltage output with 42A sensing capability and operates across industrial temperature ranges. The product is currently obsolete, making equivalent substitutes necessary for ongoing design requirements and production continuity.

Substiute Parts

CQ330F

Asahi Kasei Microdevices/AKMIn Stock: 946CQ330F Datasheet

Current PartRFQ

CZ3722

Asahi Kasei Microdevices/AKMIn Stock: 1739CZ3722 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The CZ3722 is identified as the manufacturer-recommended substitute for the CQ330F. Substitution eligibility is determined by the following critical parameters:

Substitution Criteria:

• Sensor technology: Hall Effect, Open Loop architecture
• Measurement capability: AC/DC current sensing
• Output configuration: Ratiometric voltage output
• Supply voltage compatibility: 4.5V ~ 5.5V operating range
• Single-channel configuration
• Surface mount technology
• RoHS compliance status

The CZ3722 maintains functional equivalence through identical sensor technology, measurement methodology, and electrical interface specifications. Both devices operate within the same supply voltage window and deliver ratiometric voltage outputs suitable for direct signal conditioning.

Parameter Comparison

Engineering Selection Recommendations

The CZ3722 is the active production substitute for the obsolete CQ330F. Both devices maintain AKM manufacturer lineage and Hall Effect open-loop architecture with ratiometric voltage output.

Design Considerations:

The CZ3722 introduces the following parameter variations requiring circuit evaluation:

• Sensitivity increase (80mV/A to 100mV/A): Requires signal conditioning adjustment for equivalent output scaling
• Accuracy tolerance (±0.5% to ±1.7%): Affects measurement precision in applications requiring tight error budgets
• Response time (0.5µs to 1µs): Impacts bandwidth-limited applications
• Polarization change (Bidirectional to Unidirectional): Restricts measurement to single current direction
• Package footprint change (24-LSSOP to 16-PowerSOIC): Requires PCB layout redesign
• Supply current increase (11mA to 25mA): Affects power budget calculations

Both devices maintain identical 4.5V ~ 5.5V supply voltage compatibility and RoHS compliance status. The CZ3722 supports extended operating temperature to 105°C compared to the CQ330F's 90°C maximum.

Frequently Asked Questions (FAQ)

Q: Can the CZ3722 directly replace the CQ330F without circuit modifications?

A: No. While both devices use identical Hall Effect open-loop technology and ratiometric voltage output, the CZ3722 has different sensitivity (100mV/A vs 80mV/A), accuracy (±1.7% vs ±0.5%), and polarization (unidirectional vs bidirectional). Signal conditioning and measurement direction must be re-evaluated.

Q: What is the primary difference in measurement capability between these sensors?

A: The CQ330F measures bidirectional current (AC and DC in both directions), while the CZ3722 measures unidirectional current only. Applications requiring AC current measurement or bidirectional DC sensing must account for this functional difference.

Q: Are there package compatibility issues when substituting the CZ3722?

A: Yes. The CQ330F uses 24-LSSOP (0.220", 5.60mm width) packaging while the CZ3722 uses 16-PowerSOIC (0.303", 7.70mm width). PCB footprint, trace routing, and thermal management layouts require redesign.

Q: How do the accuracy specifications compare?

A: The CQ330F provides ±0.5% accuracy while the CZ3722 provides ±1.7% accuracy. Applications with tight measurement error requirements may require additional calibration or signal processing when using the CZ3722.

Q: What is the impact of the sensitivity difference on circuit design?

A: The CZ3722's higher sensitivity (100mV/A vs 80mV/A) produces 25% greater output voltage per ampere. Analog-to-digital converter input ranges, amplifier gains, and threshold detection circuits must be recalibrated accordingly.

Q: Does the CZ3722 support the same operating temperature range?

A: No. The CZ3722 extends the upper operating temperature to 105°C compared to the CQ330F's 90°C maximum. Both maintain the same -40°C minimum. Applications operating above 90°C benefit from the CZ3722's extended range.

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

A: The CQ330F responds in 0.5µs while the CZ3722 responds in 1µs. High-frequency current measurement applications or fast transient detection may be affected by this 2x difference in response time.