Clearance, Creepage distance ≧ 8.0mm
Coreless Current Sensor ICs
Current Sensor ICs
The CZ37 series of coreless current sensor ICs has creepage and clearance distances of 8 mm or more, generates less heat, and is ultra-accurate.
The CZ37 series and CZ3A series have the same package profile and support 5V and 3V outputs, respectively.
The CZ37 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 CZ37 series, product details, datasheets, and product lineup information. It also provides technical information such as safety standard information and application notes.
1. Clearance, Creepage distance≧8mm
By developing AKM's original package, both creepage distance and clearance of 8.0mm or more is achieved.
The CZ37 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 CZ37 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
CZ37 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.
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.
|Current sensor type||Coreless Current Sensor IC :
|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|
|Creepage / Clearance
|Disturbance magnetic field
fluctuation suppression function
|Safety Standards||IEC/UL62368-1 certified
|JEDEC Standard Packaging||Compliant|
|Minimum Order Quantity||[pcs.]||1000|
CZ37 Series You can download a datasheet (PDF file) below.
|CZ3720||-0.4 ~ 10.3
|CZ3721||-0.8 ~ 20.6
|CZ3722||-1.7 ~ 41.3
|CZ3723||-2.9 ~ 68.8
|CZ3724||-4.4 ~ 103.4
|CZ3725||-7.1 ~ 165.8
|CZ3726||-14.9 ~ 345.2
*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.
You can download documents and data necessary for design. Please make use of them when designing.
Certified with safety standards
The CZ37 series has UL-60950, IEC60950, and UL-1577 certifications. You can download a detailed PDF file below.
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|Coreless||SOP||5.0||5.0||60||± 5.3 to ± 180
||Bipolar||Retiometric||≧ 8.0||1118||CZ370x||CZ37 Series|
|0 to 345.2||Unipolar||CZ372x|
|3.0||50||± 11.6 to ± 166.6||Bipolar||Non-Ratiometric||CZ3AGx||CZ3A Series|
|3.3||3.3||± 12.9 to ± 129.1||CZ3A0x|
|5.0||5.0||20||± 4.5 to ± 42||Bipolar
||Retiometric||≧ 5.0||1000||CQ330x||CQ3 Series|
|± 20.5 to 42||Unipolar|
|3.3||3.3||± 8.5 to ± 44||Bipolar||CQ320x|
|DIP||5.0||5.0||50||± 21 to ± 170||Bipolar||≧ 13.3||1330||CQ233x||CQ2 Series|
|3.3||3.3||± 21 to ± 85||CQ223x|
|5.0||5.0||± 170||≧ 2.7||270||CQ2366|
* Pollution Degree II with reinforced insulation