CZ370, CZ372 Series

Creepage and clearance distances of 8 mm or more, generates less heat, and  is ultra-accurate.

The CZ370, CZ372 series includes a double-pole detection model (CZ370x) and a single-pole detection model (CZ372x).

CZ370, CZ372 Series 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 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
(Typ.)

-0.7~0.5
(Min. Max.)

1 Bipolar CZ3700 DS
CZ3701 ±10.7 200 ±4.0 CZ3701 DS
CZ3702 ±21.5 100 ±3.5 CZ3702 DS
CZ3703 ±36 60 ±3.3 CZ3703 DS
CZ3704 ±54 40 ±3.2 CZ3704 DS
CZ3705 ±86.4 25 ±3.1 CZ3705 DS
CZ3706 ±180 12 ±3.1 CZ3706 DS
CZ3720 -0.4 ~ 10.3
400 ±0.7 ±4.9

±0.7
(Typ.)

-1.2~0.7
(Min. Max.)

1 Unipolar CZ3720 DS
CZ3721 -0.8 ~ 20.6
200 ±4.0 CZ3721 DS
CZ3722 -1.7 ~ 41.3
100 ±3.5 CZ3722 DS
CZ3723 -2.9 ~ 68.8
60 ±3.3 CZ3723 DS
CZ3724 -4.4 ~ 103.4
40 ±3.2 CZ3724 DS
CZ3725 -7.1 ~ 165.8
25 ±3.1 CZ3725 DS
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

Application Note

Download our guide to the CZ370, CZ372 series for key insights and design tips.

PDF (1.89MB)

PCB

PCB Design Kit

We provide evaluation board Gerber data, PCB symbol, footprint, and 3D model.

 ZIP (1.43MB)

CZ370x

CZ370x Simulation Model

Coming soon

CZ372x

CZ372x Simulation Model

Coming soon

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.