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AH3774
Document number: DS37899 Rev. 1 - 2
1 of 14
www.diodes.com
September 2015
© Diodes Incorporated
AH3774
HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH
Description
The AH3774 is a high-voltage, high-sensitivity Hall Effect Latch IC
designed for commutation of brushless DC motor, flow meters, linear
encoders and position sensors in industrial and consumer home
appliance and personal care applications. To support a wide range of
demanding applications, the design is optimized to operate over the
supply range of 3.0V to 28V. With chopper stabilized architecture and
an internal bandgap regulator to provide temperature compensated
supply for internal circuits, the AH3774 provides a reliable solution
over the whole operating range. For robustness and protection, the
device has a reverse blocking diode with a Zener clamp on the
supply. The output has an over current limit and a Zener clamp.
The single open-drain output can be switched on with South Pole of
sufficient strength and switched off with North Pole of sufficient
strength. When the magnetic flux density (B) perpendicular to the
package is larger than the operate point (Bop) the output is switched
on (pulled low). The output is held latched until magnetic flux density
reverses and becomes lower than the release point (Brp).
The magnetic operating and release polarity is opposite for SOT23
and SC59 packages. SOT23 and SIP-3 packages will require South
Pole to the part marking side to operate while SC59 will require South
Pole to the non-part marking side.
Features
Bipolar Latch (South Pole: On, North Pole: Off)
3.0V to 28V Operating Voltage Range
High Sensitivity: Bop and Brp of +40G and -40G Typical
Single Open Drain Output with Over Current Limit
Chopper Stabilized Design Provides
Superior Temperature Stability
Minimal Switch Point Drift
Enhanced Immunity to Stress
Good RF Noise Immunity
Reverse Blocking Diode and Zener Clamp on Supply
-40°C to +125°C Operating Temperature
ESD (HBM): 6kV
Industry Standard SC59, SOT23 and SIP-3 Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
1 V
DD
GND 2
3 OUTPUT
SC59 and SOT23
(Top View)
1.
V
DD
2.
GND
3.
OUTPUT
SIP-3
Applications
Brushless DC Motor Commutation
Revolution Per Minute (RPM) Measurement
Flow Meters
Angular and Linear Encoder and Position Sensors
Contact-less Commutation, Speed Measurement and Angular
Position Sensing/Indexing in Consumer Home Appliances, Office
Equipments and Industrial Applications
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about ogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-lorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
Verzeichnis
- ・ Konfiguration des Pinbelegungsdiagramms on Seite 1 Seite 2
- ・ Abmessungen des Paketumrisses on Seite 9 Seite 10 Seite 11 Seite 12
- ・ Paket-Footprint-Pad-Layout on Seite 13
- ・ Teilenummerierungssystem on Seite 8
- ・ Markierungsinformationen on Seite 8 Seite 9 Seite 10 Seite 11 Seite 12
- ・ Blockdiagramm on Seite 2
- ・ Typisches Anwendungsschaltbild on Seite 2
- ・ Technische Daten on Seite 3
- ・ Anwendungsbereich on Seite 1 Seite 2
- ・ Elektrische Spezifikation on Seite 3 Seite 7
