AK3103 Equivalent & Substitute Parts

Part Overview

The AK3103 is a coreless current sensor IC manufactured by Asahi Kasei Microdevices (AKM) designed for AC/DC current measurement applications. This Hall Effect, open loop sensor provides unidirectional current sensing up to 35A with ratiometric voltage output. The device is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support and new design implementations where this sensor type is required.

Substiute Parts

AK3103

Asahi Kasei Microdevices/AKMIn Stock: 852AK3103 Datasheet

Current PartRFQ

CZ3703

Asahi Kasei Microdevices/AKMIn Stock: 1501CZ3703 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AK3103 is based on the following critical parameters that must be maintained or improved:

• Sensor Technology: Hall Effect, open loop architecture
• Current Sensing Capability: Minimum 35A rating
• Output Configuration: Ratiometric voltage output
• Sensitivity: 60mV/A
• Supply Voltage Compatibility: 4.5V ~ 5.5V operation
• Single Channel: 1-channel configuration
• Surface Mount Packaging: SMD form factor
• Compliance: ROHS3 certification

The CZ3703 qualifies as a manufacturer-recommended substitute based on these parameters. While package geometry differs, the electrical characteristics and functional performance parameters align with or exceed the AK3103 specifications.

Parameter Comparison

Engineering Selection Recommendations

The CZ3703 is the manufacturer-recommended substitute for the obsolete AK3103. Selection of the CZ3703 is supported by the following factors:

• Product Status: The CZ3703 is actively manufactured by AKM, ensuring long-term availability and supply chain continuity compared to the obsolete AK3103.
• Electrical Compatibility: Both devices operate on identical 4.5V ~ 5.5V supply voltage with matching 60mV/A sensitivity and ratiometric voltage output architecture.
• Performance Enhancement: The CZ3703 provides improved linearity (±0.13% vs ±0.6%), superior accuracy (±1% vs ±1.5%), and faster response time (1µs vs 2µs).
• Compliance Certification: Both parts maintain ROHS3 compliance and identical MSL ratings, meeting regulatory and environmental requirements.
• Current Rating: The CZ3703 36A rating exceeds the AK3103 35A specification, providing margin for application requirements.
• Temperature Range: Extended operating temperature range (-40°C ~ 105°C) of the CZ3703 accommodates broader thermal environments.

Critical Consideration: Package geometry differs significantly. The AK3103 uses 24-PowerLSSOP (14 leads) while the CZ3703 uses 16-PowerSOIC (10 leads). PCB layout and footprint redesign is required for physical integration.

Frequently Asked Questions (FAQ)

Q: Can the CZ3703 directly replace the AK3103 without PCB modification?

A: No. While electrically compatible, the package geometries differ substantially. The AK3103 uses a 24-PowerLSSOP package with 14 leads, whereas the CZ3703 uses a 16-PowerSOIC package with 10 leads. PCB footprint redesign and layout modification are necessary.

Q: What is the key difference between unidirectional and bidirectional polarization in these sensors?

A: The AK3103 operates in unidirectional mode, measuring current flow in one direction only. The CZ3703 operates in bidirectional mode, capable of measuring current flow in both directions. For applications requiring unidirectional sensing only, the bidirectional capability of the CZ3703 does not create incompatibility; it provides expanded functionality.

Q: Are the supply voltage requirements identical between AK3103 and CZ3703?

A: Yes. Both devices operate on 4.5V ~ 5.5V supply voltage with identical ratiometric output architecture. No power supply modifications are required.

Q: Does the CZ3703 maintain the same sensitivity as the AK3103?

A: Yes. Both devices provide 60mV/A sensitivity, ensuring equivalent signal scaling and analog-to-digital conversion characteristics in measurement circuits.

Q: What is the significance of the improved linearity specification in the CZ3703?

A: The CZ3703 linearity of ±0.13% compared to the AK3103 ±0.6% indicates superior proportionality between input current and output voltage across the measurement range. This improvement reduces measurement error and enhances signal fidelity in precision current monitoring applications.

Q: Is the CZ3703 suitable for applications requiring the full -40°C ~ 90°C temperature range of the AK3103?

A: Yes. The CZ3703 operating range of -40°C ~ 105°C encompasses and exceeds the AK3103 specification, ensuring compatibility across the entire original temperature envelope with additional margin for higher temperature environments.

Q: What is the impact of the 5mA increase in maximum supply current (CZ3703 25mA vs AK3103 20mA)?

A: The 5mA increase represents a 25% rise in maximum supply current consumption. For battery-powered or power-constrained applications, this difference should be evaluated against total system power budget requirements.

Q: Are both devices available in tape and reel packaging for automated assembly?

A: The CZ3703 is specified as available in Tape & Reel (TR) packaging. Confirm AK3103 packaging availability through your component supplier, as this device is obsolete and may have limited packaging options.