AH3774 High-Voltage High-Sensitivity Hall Effect Latch
The AH3774 is a high-voltage, high-sensitivity Hall Effect Latch IC designed for applications such as brushless DC motor commutation, flow meters, linear encoders, and position sensors in industrial and consumer home appliances. Optimized for a wide supply range of 3.0V to 28V, it features a chopper-stabilized architecture and an internal bandgap regulator for temperature-compensated performance. The device includes robust protection mechanisms like a reverse blocking diode with a Zener clamp on the supply and an over-current limit with a Zener clamp on the output. Its single open-drain output switches on with a sufficient South Pole magnetic field and switches off with a sufficient North Pole field, latching the state 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
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VDD) | Operating | 3.0 | 28 | V | |
| Operating Temperature Range | Operating | -40 | +125 | C | |
| Output On Voltage | IOUT = 20mA | 0.2 | 0.4 | V | |
| Output Leakage Current | VOUT = 28V, B < Brp, Output Off | <0.1 | 10 | A | |
| Supply Current (IDD) | Output Open, TA = +25C | 3 | mA | ||
| Supply Current (IDD) | Output Open, TA = -40C to +125C | 4 | mA | ||
| Device Start-Up Time | VDD >= 3V, B > Bop | 10 | s | ||
| Chopping Frequency (fc) | VDD >= 3V | 800 | kHz | ||
| Output Current Limit (IOCL) | B>Bop | 30 | 55 | mA | |
| Zener Clamp Voltage (VZ) | IDD = 5mA | 28 | V | ||
| Operation Point (Bop) | VDD = 12V, TA = +25C | 40 | Gauss | ||
| Operation Point (Bop) | TA = -40C to +125C | 20 | 40 | 60 | Gauss |
| Release Point (Brp) | VDD = 12V, TA = +25C | -40 | Gauss | ||
| Release Point (Brp) | TA = -40C to +125C | -60 | -40 | -20 | Gauss |
| Hysteresis (Bhy) | VDD = 12V, TA = +25C | 80 | Gauss | ||
| Hysteresis (Bhy) | TA = -40C to +125C | 40 | 80 | 120 | Gauss |
2210281000_DIODES-AH3774-P-A_C842096.pdf
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