Product Overview
The LF21235TMR is a digital omni-polar magnetic switch integrating TMR and CMOS technology. It offers high sensitivity, high speed, and low power consumption, drawing only 1.5A. The device features a Z-axis sensing direction, push-pull output, and an on-chip TMR voltage generator for precise magnetic sensing. It includes a Schmitt trigger for noise rejection and a band gap regulator for a stable supply voltage across a wide range. The output switches low when the magnetic field exceeds the operate point (BOP) and high when it drops below the release point (BRP). It is available in a SOT23-3 package and is RoHS compliant.
Product Attributes
- Brand: Littelfuse
- Technology: Tunneling Magnetoresistance (TMR)
- Certifications: RoHS compliant
- Package: SOT23-3
- Sensing Direction: Z axis
Technical Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit | Notes |
| Operating Point (South Pole) | TA = +25C, Vcc = 3.0V | 8 | 17 | 34 | Gauss | BOPS |
| Operating Point (North Pole) | TA = +25C, Vcc = 3.0V | -34 | -17 | -8 | Gauss | BOPN |
| Release Point (South Pole) | TA = +25C, Vcc = 3.0V | 5 | 10 | 30 | Gauss | BRPS |
| Release Point (North Pole) | TA = +25C, Vcc = 3.0V | -30 | -10 | -5 | Gauss | BRPN |
| Hysteresis | TA = +25C, Vcc = 3.0V | -- | 7 | -- | Gauss | BH |
| Supply Voltage | Operating | 1.8 | 3.0 | 5.5 | V | VCC |
| Output High Voltage | Vcc = 3.0V | Vcc - 0.3 | -- | Vcc | V | VOH |
| Output Low Voltage | Vcc = 3.0V | 0 | -- | 0.2 | V | VOL |
| Supply Current | Output Open | -- | 1.5 | 2.5 | A | Icc |
| Frequency Response | -- | -- | 1.0 | -- | kHz | - |
| Supply Voltage | Absolute Maximum | -- | -- | 7.0 | V | VCC |
| Reverse Supply Voltage | Absolute Maximum | -- | -- | 0.3 | V | VRCC |
| Output Current | Absolute Maximum | -- | -- | 9.0 | mA | IOUTSINK |
| Magnetic Flux Density | Absolute Maximum | -- | -- | 2800 | Gauss | B |
| ESD Level (HBM) | Absolute Maximum | -- | -- | 4 | kV | VESD |
| Operating Temperature | Absolute Maximum | -40 | -- | 125 | C | TA |
| Storage Temperature | Absolute Maximum | -50 | -- | 150 | C | Tstg |
2412061703_Littelfuse-LF21235TMR_C1851961.pdf
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