Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

SC59-3D-image.png

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

SOT23.png

Back to Hall Effect Latches and Switches

AH3712A

27V Resistive Pull-Up Hall Effect Latch

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Description

The AH3712 is a high-voltage, high-sensitivity, Hall-effect latch IC designed for commutation of brushless DC motors, flow meters, linear encoders, and position sensors in industrial and consumer home appliances and personal care applications. To support a wide range of demanding applications, the design is optimized to operate over a 3.0V to 27V supply range. With chopper stabilized architecture and an internal bandgap regulator to provide temperature-compensated supply for internal circuits, the AH3712 provides a reliable solution over the whole operating range. The output also has an overcurrent limit.

The single open-drain output can be switched on with a South pole of sufficient strength and switched off with a North pole of sufficient strength. When the magnetic-flux density (B) perpendicular to the package is larger than the operate point (B_OP), the output is switched on (pulled low). The output is held and latched until magnetic-flux density reverses and becomes lower than the release point (B_RP).

Feature(s)

Bipolar Latch
- AH3712/AH3712A: South Pole On, North Pole Off
- AH3712B: South Pole Off, North Pole On
0V to 27V Operating Voltage Range
High Sensitivity: B_OP and B_RP of ±25G Typical
Resistant to physical stress
Single Open-Drain (AH3712, AH3712B) or
Internal Pull-Up Resistor (AH3712A)
Output Polarity:
- Direct: AH3712, AH3712A
- Inverted: AH3712B (*Future product)
Output with Overcurrent Limit
Chopper-Stabilized Design Provides
- Superior Temperature Stability
- Minimal Switch-Point Drift
- Enhanced Immunity to Stress
Good RF Noise Immunity
-40°C to +125°C Operating Temperature
ESD HBM: 8kV, CDM: 1kV
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)
An automotive-compliant part is available under separate datasheet (AH3712Q)

Application(s)

Brushless DC motor commutation
Revolutions per minute (RPM) measurements
Flow meters
Angular and linear encoders and position sensors
Contactless commutation, speed measurements, and angular position sensing/indexing in consumer home appliances, office equipment, and industrial applications

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP)	Standard
AEC Qualified	No
Type	Latch
Outputs	Single
Output Type	Pull-Up Resistor
Active Output State (B > Bop)	Low
Inactive Output State (B < Brp)	High
Key Feature	Resistant to Physical Stress
Operating Voltage (V)	3 to 27
Average Supply Current (mA)	2.8
Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss)	10
Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss)	25
Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss)	40
Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss)	-40
Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss)	-25
Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss)	-10
Output Current Capability (mA)	50
Operating Ambient Temperature (°C)	-40 to 125

Technical Documents

Recommended Soldering Techniques

TN1.pdf