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About AKM
CZ370, CZ372 Series
Contributes to reducing design effort with various capacity ratings.
Covers a wide current range with the same package.
CZ370, CZ372 Series
Overview
- Clearance, Creepage distance ≧ 8.0mm
- supporting 60Arms
- Ultra-high Accuracy
What can be done with CZ370, CZ372 Series?
- Low heat generation
- Improve system efficiency
- System downsizing
- Precise control
The CZ370, CZ372 series of coreless current sensor ICs has creepage and clearance distances of 8 mm or more, generates less heat, and is ultra-accurate.
The CZ370, CZ372 series and CZ3A series have the same package profile and support 5V and 3V outputs, respectively.
The CZ370, CZ372 series supports 5V output, making it ideal for products with severe transmission noise.
The product lineup includes a double-pole detection model (CZ370x) that can be used for many applications such as phase current detection for AC motors and general-purpose inverters, as well as a single-pole detection model (CZ372x) that can be used for DC detection of power conditioners for photovoltaic systems.
This page contains information about the features of the CZ370, CZ372 series, product details, datasheets, and product lineup information. It also provides technical information such as safety standard information and application notes.
Features
1. Clearance, Creepage distance≧8mm
By developing AKM's original package, both creepage distance and clearance of 8.0mm or more is achieved.
The CZ370, CZ372 series supports a working voltage of over 550Vrms and can be used with 400V reinforced insulation.
2. Support wide current range and 60Arms Low-heat Generation
The CZ370, CZ372 series has a low resistance of 0.27mΩ as the primary conductor resistance with AKM's original package, As a result, compared to shunt resistors and similar products of other companies, heat generation when applying the current can be greatly suppressed, and 60Arms continuous current is achieved.
Furthermore, availability with wide current detection ranges is available. This enables to adopt common design of system boards, making it easy to roll it out to other models with different ratings.
3. Ultra-high accuracy
CZ370, CZ372 series is the coreless current sensor IC with ultra-high accuracy comparable to a closed-loop current sensor.
It has a built-in disturbance magnetic field suppression function, a change for conventional coreless current sensors, contributing to improvement of system efficiency and precise control in a wide range of applications.
Applications
Bipolar (CZ370x)
- EV quick charge stations
- Packaged Air Conditioners
- General Inverter (Drives)
- Power Conditioners
- UPS (Uninterruptible Power Supply)
Unipolar (CZ372x)
- Power Conditioners (DC side)
- Various overcurrent detection applications
When measuring current flowing in one direction, higher signal noise ratio can be achieved compared to the bipolar detection type.
It is suitable for the application which requires insulation and achieve small size with low heat generation.
Find other products
CZ370, CZ372 Series Block Diagram
| Series | CZ37 Series |
|---|---|
| Current sensor type | Coreless Current Sensor IC : Currentier |
| Package size [mm] | 12.7 x 10.9 x 2.25 |
| Package Type (Mounting style) | (Small-sized) surface mount package (SMD) |
| Power Supply Voltage [V] | 5.0 (4.5 to 5.5) |
| Operating Temperature [℃] | -40 to 105 |
| Maximum Primary Current [Arms] | 60 |
| Working Voltage [Vrms] (pollution degree=2) |
557 (reinforced insulation) |
| Creepage / Clearance Distance (min.) [mm] | 8.0 |
| Primary conductor resistance (Typ.) [mΩ] | 0.27 |
| Isolation Voltage [kVrms] | 3.0 (AC50Hz, 60s) |
| VREF Pin | Existence |
| Disturbance magnetic field fluctuation suppression function | Existence |
| Overcurrent detection function | Non-existence |
| Ratiometric / Non-Ratiometric | Ratiometric |
| Safety Standards | IEC/UL62368-1 certified UL1577 certified |
| Pb Free | Yes |
| Halogen Free | Yes |
| MSL | MSL2a |
| JEDEC Standard Packaging | Compliant |
| Packaging | TAPE |
| Minimum Order Quantity [pcs] | 1000 |
| Part Status | MP |
Lineup / Datasheet
| Product Name |
Linear Sensing Range |
Sensitivity |
Temperature Drift of Sensitivity *1 |
Temperature Drift of Zero-Current Output *1 |
Total Accuracy *2 |
Response time |
Bipolar / Unipolar |
Datasheet Download (PDF) |
|---|---|---|---|---|---|---|---|---|
| [A] | [mV/A] | [%] | [mV] | [%F.S.] | [μs] | |||
| CZ3700 | ±5.3 | 400 | ±0.7 | ±4.9 | ±0.4 -0.7~0.5 |
1 | Bipolar | CZ3700 DS |
| CZ3701 | ±10.7 | 200 | ±4.0 | CZ3701 DS |
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| CZ3702 | ±21.5 | 100 | ±3.5 | CZ3702 DS |
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| CZ3703 | ±36 | 60 | ±3.3 | CZ3703 DS |
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| CZ3704 | ±54 | 40 | ±3.2 | CZ3704 DS |
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| CZ3705 | ±86.4 | 25 | ±3.1 | CZ3705 DS |
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| CZ3706 | ±180 | 12 | ±3.1 | CZ3706 DS |
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| CZ3720 | -0.4 ~ 10.3 |
400 | ±0.7 | ±4.9 | ±0.7 -1.2~0.7 |
1 | Unipolar | CZ3720 DS |
| CZ3721 | -0.8 ~ 20.6 |
200 | ±4.0 | CZ3721 DS |
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| CZ3722 | -1.7 ~ 41.3 |
100 | ±3.5 | CZ3722 DS |
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| CZ3723 | -2.9 ~ 68.8 |
60 | ±3.3 | CZ3723 DS |
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| CZ3724 | -4.4 ~ 103.4 |
40 | ±3.2 | CZ3724 DS |
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| CZ3725 | -7.1 ~ 165.8 |
25 | ±3.1 | CZ3725 DS |
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| CZ3726 | -14.9 ~ 345.2 |
12 | ±3.1 | CZ3726 DS |
[Notes]
*1 It is defined as the "average value ± 3σ" of the actual measurement result (Ta = 0 to 90 °C) in a certain lot.
*2 The typical value is defined as the “average value ± 1σ” of the actual measurement result (Ta = 0 to 90 °C) in a certain lot.
In the same manner, the minimum and maximum values are defined as the “average value ± 3σ” of the actual measurement result (Ta = 0 to 90 °C) in a certain lot.
Technical information
You can use useful simulation or calculation tools for your design.Please note that you are required to register your information when using some of those tools.
Application Note
Download our guide to the CZ370, CZ372 series for key insights and design tips.
PDF (1.89MB)
PCB Design Kit
We provide evaluation board Gerber data, PCB symbol, footprint, and 3D model.
ZIP (1.43MB)
MATLAB Simulation Model
We provide MATLAB/Simulink simulation models
FAQ
Product-related FAQs
Quality Data
The AKM Group prepares quality data.
Certified with safety standards
The CZ370, CZ372 series has UL62368, IEC62368, and UL1577 certifications. You can download a detailed PDF file below.
Design Support
You can use useful simulation or calculation tools for your design.Please note that you are required to register your information when using some of those tools.
Series lineup
ml
| Supply Voltage |
Output Voltage |
Effective Current |
Measurement Range |
Bipolar / Unipolar |
Ratiometric/ Non-Ratiometric |
Creepage Clearance |
Working Voltage * |
Product Name |
Product Series |
Part Status |
|---|---|---|---|---|---|---|---|---|---|---|
| (V) | (V) | (Arms) | (Apeak) | (mm) | (Vrms) | |||||
| 5.0 | 5.0 | 100 | ± 115 to ± 225 | Bipolar | Retiometric | ≧ 8.0 | 1118 | CZ375x | CZ375 Series | MP |
| 60 | ± 5.3 to ± 180 |
CZ370x | CZ370 Series CZ372 Series |
MP | ||||||
| 0 to 345.2 | Unipolar | CZ372x | ||||||||
| 3.0 | 50 | ± 11.6 to ± 166.6 | Bipolar | Non-Ratiometric | CZ3AGx | CZ3A Series | MP | |||
| 3.3 | 3.3 | ± 12.9 to ± 129.1 | CZ3A0x |
* Pollution Degree II with basic insulation
Inquiries about Current Sensors
For any inquiries regarding products, samples, technology, consultations, estimates, or purchases, please feel free to contact us.