News Release

- New Product Information -

AKM releases an ultra-high accuracy coreless current sensor supporting 60Arms with more than 8mm of Creepage / Clearance Distance

Product Name
CZ-370x (x: 0 to 6)
Product Category:
Current Sensors > Ultra-high Accuracy Coreless Current Sensors
Ultra-high accuracy coreless current sensor
Supporting 60 Arms
Creepage / Clearance Distance > 8mm
AC Motors, DC Motors, UPS’s,
General Inverters, Power Conditioners


Corresponding to the UL safety standard UL61800-5-1 for industrial equipment, Asahi Kasei Microdevices Corporation, (AKM), has developed the CZ-370x series coreless current sensor, which achieving both creepage distance and clearance distance greater than 8 mm.  With a wide current detection lineup from ±5.3 to ±180 App, 60 Arms, the CZ-370x series can be used for many applications including AC motors and general inverters.


● Creepage / Clearance Distance > 8mm

By developing AKM’s original package, both creepage distance and clearance distance of 8 mm or more are achieved.  It supports a Working Voltage of 600 Vrms (with reinforced insulation), making insulation design easy.

● Support ±5 to ±180App and 60Arms Low-heat Generation

The CZ-370x series has a low resistance of 0.27 mΩ 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 60 Arms continuous current can be applied.  Furthermore, availability with wide current detection ranges from ± 5.3 App (CZ-3700) to ± 180 App (CZ-3706) is achieved.  This enables to adopt a common design of system boards, making it easy to roll it out to other models with different ratings.

● Ultra-High Accuracy

The CZ-370x series is ultra-high accurate coreless current sensor with 0.5% F.S. (typical).  In addition, it has a built-in stray magnetic field reduction function, a challenge for conventional coreless current sensors, contributing to improvement of system efficiency and precise control in a wide range of applications.

Main Specifications of the CZ-370x series

Product NameLinear Sensing Range
Temperature Drift of Sensitivity
(%) *1
Temperature Drift of Zero-Current Output
(mV) *1
Total Accuracy
(%F.S.) *2
Response Time
CZ-3700 ±5.3 400



-0.4 to 0.8
(Min. to Max.)

CZ-3701 ±10.7 200 ±4.4
CZ-3702 ±21.5100±3.8
CZ-3703 ±3660±3.6
CZ-3704 ±5440±3.5
CZ-3705 ±86.425±3.5
CZ-3706 ±18012±3.4
*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.

* Information on this page is current on the date of press release.
* AKM is a trademark of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States.
* Currentier is a trademark of Asahi Kasei Microdevices Corporation (under registration review).

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