CQ3202 Equivalent & Substitute Parts

Part Overview

The CQ3202 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 maximum sensing range of 21.1A. The device is packaged in a 24-LSSOP (0.220", 5.60mm Width) surface mount configuration with 10 leads.

The CQ3202 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this sensor.

Key Parameters

Parameter	CQ3202 Specification
Sensor Type	Hall Effect, Open Loop
Current Sensing Range	21.1A
Number of Channels	1
Output Type	Ratiometric, Voltage
Sensitivity	60mV/A
Accuracy	±1.3%
Supply Voltage	3.3V
Response Time	0.5µs
Supply Current (Max)	6.2mA
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the CQ3202 is determined by the following critical parameters:

Sensor technology: Hall Effect, open-loop configuration
Measurement capability: AC/DC bidirectional current sensing
Current sensing range: Minimum 21.1A
Output characteristics: Voltage output with ratiometric or equivalent behavior
Supply voltage compatibility: 3.3V nominal operation
Mounting standard: Surface mount technology
Package form factor: Compatibility with PCB layout constraints
Environmental compliance: ROHS3 certification

The CZ3A03 qualifies as a substitute based on matching sensor type, bidirectional measurement capability, voltage output, surface mount configuration, and ROHS3 compliance. Differences in specific parameters (current range, sensitivity, accuracy, response time, and package dimensions) must be evaluated against application requirements.

Parameter Comparison

Parameter	CQ3202	CZ3A03	Compatibility Notes
Sensor Type	Hall Effect, Open Loop	Hall Effect, Open Loop	Identical
Current Sensing Range	21.1A	22.1A	CZ3A03 range is 4.7% higher
Number of Channels	1	1	Identical
Output Type	Ratiometric, Voltage	Voltage	Both voltage output; CQ3202 specifies ratiometric
Sensitivity	60mV/A	70mV/A	CZ3A03 sensitivity is 16.7% higher
Accuracy	±1.3%	±2.1%	CQ3202 has tighter tolerance
Supply Voltage	3.3V	3V ~ 3.6V	CZ3A03 has wider supply range; 3.3V within specification
Response Time	0.5µs	1µs	CQ3202 is 2x faster
Supply Current (Max)	6.2mA	16mA (Typ)	CZ3A03 draws significantly higher current
Operating Temperature	-40°C ~ 90°C	-40°C ~ 85°C	CQ3202 has 5°C higher upper limit
Polarization	Bidirectional	Bidirectional	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package	24-LSSOP (0.220", 5.60mm Width), 10 Leads	16-PowerSOIC (0.303", 7.70mm Width), 10 Leads	Different package footprints; PCB redesign required
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Product Status	Obsolete	Active	CZ3A03 is in active production

Engineering Selection Recommendations

The CZ3A03 is an active production substitute for the obsolete CQ3202. Both devices maintain ROHS3 compliance and are manufactured by the same supplier (Asahi Kasei Microdevices).

Selection of the CZ3A03 requires evaluation of the following design considerations:

Package footprint change from 24-LSSOP to 16-PowerSOIC necessitates PCB layout modification
Increased supply current consumption (16mA typical vs. 6.2mA maximum) affects power budget calculations
Higher sensitivity (70mV/A vs. 60mV/A) and reduced accuracy (±2.1% vs. ±1.3%) impact signal conditioning and calibration requirements
Slower response time (1µs vs. 0.5µs) may affect high-frequency measurement applications
Wider supply voltage range (3V–3.6V) provides greater design flexibility compared to fixed 3.3V operation
Slightly higher current sensing range (22.1A vs. 21.1A) provides marginal headroom for peak current conditions

The CZ3A03 is suitable for applications where PCB redesign is feasible and the parameter differences align with system requirements.

Frequently Asked Questions (FAQ)

Q: Can the CZ3A03 be used as a direct pin-for-pin replacement for the CQ3202?

A: No. The CQ3202 uses a 24-LSSOP package while the CZ3A03 uses a 16-PowerSOIC package. Both have 10 leads but different physical dimensions and pin configurations. PCB layout modification is required.

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

A: The CZ3A03 has higher sensitivity (70mV/A vs. 60mV/A), slightly higher current range (22.1A vs. 21.1A), wider supply voltage tolerance (3V–3.6V vs. fixed 3.3V), and higher supply current consumption (16mA typical vs. 6.2mA maximum). The CQ3202 offers better accuracy (±1.3% vs. ±2.1%) and faster response time (0.5µs vs. 1µs).

Q: Are both sensors suitable for AC/DC current measurement?

A: Yes. Both the CQ3202 and CZ3A03 are Hall Effect open-loop sensors with bidirectional measurement capability, supporting AC/DC current sensing applications.

Q: What is the impact of the CZ3A03's higher supply current on system design?

A: The CZ3A03 draws up to 16mA typical supply current compared to the CQ3202's 6.2mA maximum. This 2.6x increase requires verification that the power supply and current distribution network can accommodate the additional load without affecting system performance.

Q: Does the CZ3A03 maintain the same environmental compliance as the CQ3202?

A: Yes. Both devices are ROHS3 compliant with identical moisture sensitivity levels (MSL 2A, 4 weeks). The CZ3A03 operates across -40°C to 85°C, which is 5°C lower than the CQ3202's upper limit.

Q: Is the CZ3A03 available in production quantities?

A: Yes. The CZ3A03 is classified as active product status with current manufacturing availability, unlike the obsolete CQ3202.

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