Product Overview
The AH3774 is a high-voltage, high-sensitivity Hall Effect Latch IC designed for reliable commutation in brushless DC motors, flow meters, linear encoders, and position sensors. It is optimized for industrial and consumer home appliance applications, operating over a wide supply range of 3.0V to 28V. The device features a chopper-stabilized architecture and an internal bandgap regulator for temperature-compensated performance, ensuring a reliable solution across its operating range. It includes built-in protection with a reverse blocking diode and Zener clamp on the supply, as well as an over-current limit and Zener clamp on the output. The single open-drain output switches on with a South Pole and off with a North Pole of sufficient strength, with latching behavior until the magnetic flux reverses.
Product Attributes
- Brand: Diodes Incorporated
- Document Number: DS37899
- Revision: 1 - 2
- Date: September 2015
- Certifications: Totally Lead-Free & Fully RoHS Compliant, Halogen and Antimony Free (Green Device)
Technical Specifications
| Feature | Specification |
| Device Type | Hall Effect Latch |
| Operating Voltage Range | 3.0V to 28V |
| High Sensitivity | Bop and Brp of +40G and -40G Typical |
| Output Type | Single Open Drain with Over Current Limit |
| Temperature Stability | Chopper Stabilized Design |
| Noise Immunity | Good RF Noise Immunity |
| Protection | Reverse Blocking Diode and Zener Clamp on Supply; Output Over Current Limit and Zener Clamp |
| Operating Temperature Range | -40C to +125C |
| ESD Withstand Capability (HBM) | 6kV |
| Package Options | SC59, SOT23, SIP-3 |
| Supply Current (Typical @ TA=+25C) | 3 mA |
| Supply Current (Typical @ TA=-40C to +125C) | 4 mA |
| Output On Voltage (Typical @ IOUT=20mA) | 0.2V |
| Output Leakage Current (Typical @ VOUT=28V, B < Brp) | <0.1 A |
| Output Current Limit (Typical) | 30 - 55 mA |
| Zener Clamp Voltage (IDD=5mA) | 28V |
| Operation Point (Bop, Typical @ VDD=12V, TA=+25C) | 40 Gauss |
| Release Point (Brp, Typical @ VDD=12V, TA=+25C) | -40 Gauss |
| Hysteresis (Bhy, Typical @ VDD=12V, TA=+25C) | 80 Gauss |
| Device Start-Up Time (Typical) | 10 s |
| Chopping Frequency (Typical) | 800 kHz |
| Output Rising Time (Typical @ RL=1k, CL=20pF) | 0.2 s |
| Output Falling Time (Typical @ RL=1k, CL=20pF) | 0.1 s |
2210281000_DIODES-AH3774-SA-7_C842136.pdf
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