CQ3300 Equivalent & Substitute Parts

Part Overview

The CQ3300 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 a sensing range of 6.4A and operates across industrial temperature ranges. The product is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production continuity.

Key Parameters

Parameter	CQ3300 Specification
Manufacturer	Asahi Kasei Microdevices (AKM)
Sensor Type	Hall Effect, Open Loop
Current Sensing Range	6.4A
Number of Channels	1
Output Type	Ratiometric, Voltage
Sensitivity	325mV/A
Frequency Response	1MHz
Linearity	±0.6%
Accuracy	±0.5%
Supply Voltage	4.5V ~ 5.5V
Response Time	0.5µs
Supply Current (Max)	11mA
Operating Temperature	-40°C ~ 90°C
Polarization	Bidirectional
Mounting Type	Surface Mount
Package	24-LSSOP (0.220", 5.60mm Width), 10 Leads
RoHS Status	ROHS3 Compliant
MSL Rating	2A (4 Weeks)

Substitute Part Grouping Explanation

Substitution of the CQ3300 is based on functional equivalence within the AKM Hall Effect current sensor product line. The CZ3700 qualifies as a manufacturer-recommended substitute based on the following critical parameters:

Substitution Criteria:

Sensor technology: Hall Effect, open-loop architecture
Measurement capability: AC/DC bidirectional current sensing
Output interface: Ratiometric voltage output
Supply voltage compatibility: 4.5V ~ 5.5V operating range
Polarization: Bidirectional sensing capability
Mounting: Surface mount technology
Compliance: ROHS3 certification maintained

The CZ3700 operates within compatible electrical parameters while offering improved linearity and extended temperature range, though with different current sensing specifications and package form factor.

Parameter Comparison

Parameter	CQ3300	CZ3700 (Substitute)	Compatibility Notes
Manufacturer	AKM	AKM	Same manufacturer
Sensor Type	Hall Effect, Open Loop	Hall Effect, Open Loop	Functionally equivalent
Current Sensing Range	6.4A	5.3A	CZ3700 has lower sensing range
Number of Channels	1	1	Equivalent
Output Type	Ratiometric, Voltage	Ratiometric, Voltage	Equivalent
Sensitivity	325mV/A	400mV/A	CZ3700 has higher sensitivity
Linearity	±0.6%	±0.13%	CZ3700 offers superior linearity
Accuracy	±0.5%	±1%	CQ3300 has tighter accuracy
Supply Voltage	4.5V ~ 5.5V	4.5V ~ 5.5V	Equivalent
Response Time	0.5µs	1µs	CQ3300 has faster response
Supply Current (Max)	11mA	25mA	CZ3700 draws higher current
Operating Temperature	-40°C ~ 90°C	-40°C ~ 105°C	CZ3700 supports extended range
Polarization	Bidirectional	Bidirectional	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package	24-LSSOP (0.220", 5.60mm Width), 10 Leads	16-PowerSOIC (0.303", 7.70mm Width), 10 Leads	Different package footprints
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
MSL Rating	2A (4 Weeks)	2A (4 Weeks)	Equivalent

Engineering Selection Recommendations

CQ3300 (Original Part):

Product status: Discontinued at DiGi Electronics
Inventory availability: 2000 Pcs in stock
Suitable for: Existing designs with established PCB layouts and current sensing requirements up to 6.4A
Compliance: ROHS3 certified

CZ3700 (Manufacturer-Recommended Substitute):

Product status: Active
Inventory availability: 5417 Pcs in stock
Suitable for: New designs or redesigns where current sensing requirements do not exceed 5.3A
Advantages: Superior linearity (±0.13%), extended operating temperature range (-40°C ~ 105°C), active product status ensuring long-term availability
Considerations: Different package footprint requires PCB redesign; higher supply current consumption (25mA vs 11mA); slower response time (1µs vs 0.5µs); lower accuracy specification (±1% vs ±0.5%)

Selection between these parts depends on application current requirements, thermal operating conditions, and PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can the CZ3700 directly replace the CQ3300 on an existing PCB?

A: No. The CQ3300 uses a 24-LSSOP package (0.220", 5.60mm width) while the CZ3700 uses a 16-PowerSOIC package (0.303", 7.70mm width). PCB layout and footprint modifications are required for substitution.

Q: What is the maximum current the CZ3700 can measure compared to the CQ3300?

A: The CQ3300 measures up to 6.4A while the CZ3700 measures up to 5.3A. Applications requiring current sensing above 5.3A cannot use the CZ3700 as a substitute.

Q: Are both parts compatible with 5V supply systems?

A: Yes. Both the CQ3300 and CZ3700 operate within the 4.5V ~ 5.5V supply voltage range, making them compatible with standard 5V logic systems.

Q: What is the difference in output sensitivity between these parts?

A: The CQ3300 provides 325mV/A sensitivity while the CZ3700 provides 400mV/A sensitivity. The higher sensitivity of the CZ3700 results in greater output voltage change per ampere of measured current.

Q: Which part has better measurement linearity?

A: The CZ3700 offers superior linearity at ±0.13% compared to the CQ3300 at ±0.6%, indicating more proportional output across the measurement range.

Q: Can the CZ3700 operate at higher temperatures than the CQ3300?

A: Yes. The CZ3700 operates from -40°C to 105°C while the CQ3300 operates from -40°C to 90°C, providing a 15°C extended upper temperature limit.

Q: What is the response time difference between these sensors?

A: The CQ3300 has a response time of 0.5µs while the CZ3700 has a response time of 1µs. The CQ3300 responds twice as fast to current changes.

Q: Are both parts RoHS compliant?

A: Yes. Both the CQ3300 and CZ3700 are ROHS3 compliant and carry identical MSL ratings of 2A (4 Weeks).

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