AH3712 High-Voltage, High-Sensitivity Hall Effect Latch
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 appliance and personal care applications. Optimized for a 3.0V to 27V supply range, it features a chopper-stabilized architecture and internal bandgap regulator for reliable operation across the entire range. The output includes an overcurrent limit. The single open-drain output switches on with a South pole and off with a North pole of sufficient strength. It latches until the magnetic flux density reverses below the release point.
Product Attributes
- Brand: Diodes Incorporated
- Certifications: Totally Lead-Free & Fully RoHS Compliant, Halogen and Antimony Free (Green Device)
- Available Variants: AH3712/AH3712A (South Pole On, North Pole Off), AH3712B (South Pole Off, North Pole On)
- Packages: SC59, SOT23 (Type S), SIP-3
- Automotive-Compliant Part: AH3712Q (available under separate datasheet)
Technical Specifications
| Parameter | Condition | Min | Typ | Max | Unit | Notes |
| Supply Voltage (VDD) | Operating Range | 3.0 | 27 | V | ||
| Load Dump Voltage | 40 | V | Transient stress rating | |||
| Reverse Supply Voltage (AH3712 Only) | -18 | V | ||||
| Operating Temperature Range | -40 | +125 | C | |||
| Output On Voltage (VOUT_ON) | IOUT = 20mA, Output on | 0.42 | V | |||
| Output Leakage Current (IOUT_OFF) | VOUT = 27V, Output off | <0.1 | 10 | A | ||
| Supply Current (IDD) | Output off, TA = +25C | 2.8 | 3.8 | mA | ||
| Output off, TA = -40C to +125C | 2.8 | 4.8 | mA | |||
| Internal Pull-Up Resistance (RPU) | AH3172A only, TA = -40C to +125C | 10 | 14 | 18 | k | |
| Device Start-Up Time (tST) | VDD >= 3V, B > BOP + 10Gs or B < BRP - 10Gs | 13 | s | |||
| Chopping Frequency (fc) | VDD >= 3V | 500 | kHz | |||
| Time Delay (td) | B > 3*BOPMAX, square wave magnetic field | 10 | s | |||
| Output Rising Time (tr) | RL = 1k, CL = 20pF | 0.1 | 1 | s | External pull-up resistor & load capacitance dependent | |
| Output Falling Time (tf) | RL = 1k, CL = 20pF | 0.3 | 1 | s | Internal switch resistance & load capacitance dependent | |
| Output Current Limit (IOCL) | Output on | 30 | 60 | mA | ||
| Zener Clamp Voltage (VZ) | IDD = 8mA, TA = +25C, Output off | 36 | V | |||
| Magnetic Characteristics (BOP) | AH3712 / AH3712A (Direct Polarity) | 10 | 25 | 40 | Gauss | Operation Point |
| AH3712B (Inverted Polarity) | 10 | 25 | 40 | Gauss | Operation Point | |
| All Variants (South pole to part-marking side for SOT23 and SIP-3, South pole to non-part marking side for SC59) | ||||||
| Magnetic Characteristics (BRP) | AH3712 / AH3712A (Direct Polarity) | -40 | -25 | -10 | Gauss | Release Point |
| AH3712B (Inverted Polarity) | -40 | -25 | -10 | Gauss | Release Point | |
| All Variants (North pole to part-marking side for SOT23 and SIP-3, North pole to non-part marking side for SC59) | ||||||
| Hysteresis (BHY) | AH3712 / AH3712A | 20 | 50 | 80 | Gauss | (|BOPX| - |BRPX|) |
| AH3712B | 20 | 50 | 80 | Gauss | (|BOPX| - |BRPX|) | |
| ESD HBM | 8 | kV | ||||
| ESD CDM | 1 | kV |
2401221705_DIODES-AH3712-W-7_C19948384.pdf
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