Si72xx Hall Effect Sensor Demos - from Silicon Labs
MAG SWITCH OMNIPOLAR SOT23-3
SI7201-B-05-IV is a magnetic sensor. This article is going to introduce pinout, applications, features, and more details about SI7201-B-05-IV.
MAG SWITCH OMNIPOLAR SOT23-3 SI7201-B-05-IV is a magnetic sensor. This article is going to introduce pinout, applications, features, and more details about SI7201-B-05-IV.
SI7201-B-05-IV samples the magnetic field on a regular basis and has a digital output pin that goes high or low depending on the magnetic field.
SI7201-B-05-IV samples the magnetic field at regular intervals and outputs the data on a pin using analog, pulse width modulation (PWM), or Single Edge Nibble Transmission (SENT) protocols.
SI7201-B-05-IV provides for digital magnetic field reading in I2C format. The part can also be configured via I2C commands.
The Si72xx devices come in three or five-pin SOT23 packages, as well as a 1.4 mm1.6 mm0.35 mm dual-flat no-leads, 8-pin package (DFN-8), and a TO-92 package.
High-Sensitivity Hall Effect Sensor
Maximum BOP operating point/minimum field strength of <1.1 mT
Omnipolar or unipolar operation
Integrated digital signal processing for temperature and offset drift compensation
Low 400 nA Typical Current Consumption 5 samples per second
Selectable Sensitivity, Hysteresis, OutputPolarity and Sample Rate
Sensitivity Drift < ±3% over Temperature
Wide Power Supply Voltage
1.71 to 5.5 V
3.3 to 26.5 V
Selectable Output Options
Open-drain output
Digital high/low output
Industry-Standard Packaging
Surface mount SOT-23 (3 or 5 pins)
Through-hole TO-92 (3-pin)
1.4 x 1.6 mm 8-pin DFN package (coming soon)


SI7201-B-05-IV Block Diagram
Silicon Labs SI7201-B-05-IV technical specifications, attributes, parameters and parts with similar specifications to Silicon Labs SI7201-B-05-IV.
| Product Attribute | Attribute Value | |
|---|---|---|
| Factory Lead Time | 10 Weeks | |
| Mounting Type | Surface Mount | |
| Package / Case | TO-236-3, SC-59, SOT-23-3 | |
| Test Conditions | -40°C ~ 125°C | |
| Operating Temperature | -40°C~125°C TA | |
| Packaging | Strip |
| Product Attribute | Attribute Value | |
|---|---|---|
| Part Status | Active | |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) | |
| Voltage - Supply | 1.7V~5.5V | |
| Function | Omnipolar Switch | |
| Current - Supply (Max) | 0.4μA Typ | |
| Output Type | Push-Pull |
| Product Attribute | Attribute Value | |
|---|---|---|
| Polarization | North Pole, South Pole | |
| Sensing Range | ±2.0mT Trip, ±0.6mT Release | |
| Features | Tamper Detection | |
| RoHS Status | RoHS Compliant |


| Parameter | Symbol | Test Condition | Min | Typ | Max | Unit |
| Ambient Temperature Under Bias | -55 | 125 | °C | |||
| Storage Temperature | -65 | 150 | °C | |||
| Si7201/2/3/4 | ||||||
| The voltage on I/O Pins | -0.3 | VDD+0.3 | V | |||
| The voltage on VDD with Respect to Ground |
-0.3 | 6 | V | |||
| ESD Tolerance | HBM | 2 | kV | |||
| CDM | 500 | V | ||||
| Si7205/6 | ||||||
| The voltage on Output pin2 | -21 | 40 | V | |||
| The voltage on VDD with Respect to Ground3 |
-21 | 40 | V | |||
| ESD Tolerance | HBM | 8 | kV | |||
| CDM | 500 | V | ||||
| Notes: 1. Absolute maximum ratings are stress ratings only, operation at or beyond these conditions is not implied and may shorten the life of the device or alter its performance. 2. The output pin can withstand EMC transients per ISO 7637-2-2-11 and Ford EMC-CS-2009.1 with a current limiting resistor of 220 Ω to a local bypass cap of 0.1 μF and an additional 22 Ω between the capacitor and ground. 3. VDD can withstand automotive EMC transients per ISO 7637-2-2-11 and Ford EMC-CS-2009.1 with a current limiting resistor of 220 Ω. |
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• Replacement of reed switches in consumer, and security applications
• Position sensing of HVAC knob, door locks, windows, and other mechanical devices
• BLDC motor control
• Camera image stabilization, zoom, and autofocus
• Fluid level sensing
• Control knobs and selector switches
• General-purpose mechanical position sensing

SI7201-B-05-IV package information
| Dimension | Min | Max |
| A | -- | 1.25 |
| A1 | 0 | 0.1 |
| A2 | 0.85 | 1.15 |
| b | 0.3 | 0.5 |
| c | 0.1 | 0.2 |
| D | 2.90 BSC | |
| E | 2.75 BSC | |
| E1 | 1.60 BSC | |
| e | 0.95 BSC | |
| e1 | 1.90 BSC | |
| L | 0.3 | 0.6 |
| θ | 0° | 8° |
| aaa | 0.15 | |
| BBB | 0.2 | |
| ccc | 0.1 | |
| DDD | 0.2 | |
| Note: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing per ANSI Y14.5M-1994. 3. This drawing conforms to the JEDEC Solid State Outline MO-193, Variation AB. 4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020D specification for Small Body Components. |
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Download datasheets and manufacturer documentation for SI7201-B-05-IV
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