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Silicon Labs SI7205-B-00-IV
- Part No.:
- SI7205-B-00-IV
- Manufacturer:
- Silicon Labs
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SI7205-B-00-IV.pdf
- Description:
- MAGNETIC SWITCH OMNIPOL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,750
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Product details
Overview
SI7205-B-00-IV from Silicon Labs is a high-voltage omnipolar Hall-effect switch sensor in SOT23-3 package, delivering 3.0 mT maximum operate point (BOP), 0.8 mT minimum release point (BRP), open-drain output, and operation across 3.3–26.5 V supply with −40 to +125 °C temperature range. It enables robust position sensing in automotive HVAC actuators and industrial motor control where high-voltage tolerance and field immunity are critical.
For engineers reviewing the SI7205-B-00-IV datasheet, SI7205-B-00-IV pinout, SI7205-B-00-IV application, or SI7205-B-00-IV equivalent, key selection criteria include its 1000 Hz sample rate, 950 µA typical current consumption at full rate, open-drain output drive capability up to 11.4 mA sink, and compatibility with high-voltage automotive transients per ISO 7637-2-2-11.
Technical Context
The SI7205-B-00-IV integrates a chopper-stabilized Hall element, 13-bit ADC, digital signal processing for temperature/offset drift compensation, and configurable magnetic threshold detection logic. Its output toggles based on z-axis magnetic field crossing pre-programmed BOP/BRP thresholds without external components.
It operates in a fixed configuration: omnipolar switching mode, open-drain output, 20 mT full-scale range, and factory-set hysteresis of 0.6 mT. Power management supports continuous sampling at up to 1 kHz or low-duty-cycle operation via internal timing - no external clock or control required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| BOP max | 3.0 mT - defines strongest field needed to reliably trigger output transition in presence of noise and temperature variation |
| BRP min | 0.8 mT - ensures clean release after magnet removal, preventing chatter near threshold |
| Supply voltage | 3.3–26.5 V - supports direct connection to automotive battery rails and industrial 24 V systems without regulation |
| Output type | Open-drain - allows wired-OR logic, level shifting, and direct interface with microcontroller GPIO or PLC inputs |
| Sample rate | 1000 Hz - enables real-time detection of fast mechanical motion such as BLDC rotor position or valve actuation |
| Current consumption | 950 µA typical at 1000 Hz - balances responsiveness and power budget in always-on industrial sensors |
| ESD rating | 8 kV HBM - provides robustness against handling and system-level electrostatic discharge in manufacturing and field service |
Pinout & Package
SOT23-3 surface-mount package (JEDEC MO-193 AB), 2.9 mm × 2.75 mm × 1.15 mm body height, with gull-wing leads and standard reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 3.3–26.5 V; includes internal protection against ISO 7637-2-2-11 automotive transients when used with 220 Ω series resistor |
| OUT1 | Digital output terminal | Open-drain output capable of sinking 11.4 mA at VDD > 6 V; requires external pull-up for logic-high assertion |
| GND | Reference ground | Common return path for supply and output; must be low-impedance to maintain noise immunity and thermal stability |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar switching | Detects both north and south magnetic poles - eliminates need for magnet polarity alignment during assembly |
| Chopper stabilization + DSP | Reduces offset drift to < ±3% over temperature - maintains accuracy without calibration in wide-temperature environments |
| High-voltage operation | Rated for 26.5 V max supply - enables direct integration into 24 V industrial controls and 12/24 V automotive subsystems |
| Automotive transient immunity | Withstands ISO 7637-2-2-11 pulses on VDD and output pins - reduces need for external TVS or RC filtering |
| Low-noise magnetic sensing | 30 µT RMS noise at room temperature - supports reliable detection through plastic housings and air gaps up to 3 mm |
Applications
| Automotive HVAC Actuators | Industrial BLDC Motor Commutation |
|---|---|
Use Scenario: Detecting rotary position of blend door actuators in climate control systems under under-hood temperature extremes. IC Role / Device Role / Timing Role: Hall switch providing discrete on/off feedback for closed-loop position control of DC gearmotor-driven dampers. Use Value: Omnipolar operation tolerates magnet misalignment during high-volume assembly; 26.5 V rating avoids need for local LDO in 12 V/24 V vehicle architectures. | Use Scenario: Rotor position sensing for 3-phase brushless DC motors in conveyor drives and pumps operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: Magnetic switch generating commutation timing edges for inverter gate drivers. Use Value: 1000 Hz sample rate captures rotor transitions at up to 20,000 RPM; open-drain output interfaces directly with 3.3 V MCU GPIO or optocoupler inputs. |
| Factory Automation Valve Position | Medical Infusion Pump Mechanism |
Use Scenario: Monitoring linear travel of solenoid-actuated pneumatic valves in PLC-controlled packaging lines. IC Role / Device Role / Timing Role: Proximity switch confirming end-of-travel for safety interlock and cycle validation. Use Value: 8 kV HBM ESD rating withstands repeated handling in factory environments; 0.8 mT BRP prevents false release due to stray fields near motors or transformers. | Use Scenario: Detecting plunger position in syringe-based infusion pumps requiring fail-safe mechanical feedback independent of motor current. IC Role / Device Role / Timing Role: Redundant position sensor verifying dose delivery accuracy and detecting occlusion-induced stalling. Use Value: Chopper-stabilized architecture ensures < ±3% sensitivity drift over −40 to +125 °C - critical for medical device shelf-life and sterilization validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Melexis US1881EUA-ABA-000-RE | Unipolar switch, 3.3–24 V supply, 3.5 mT BOP, push-pull output, TO-92 package | Lacks omnipolar detection and automotive transient immunity; suited for cost-sensitive consumer devices | Select when magnet polarity is fixed and board space permits through-hole mounting |
| Allegro A1120ELHLT-T | Unipolar switch, 3–24 V, 2.5 mT BOP, open-drain, SOT23-3, −40 to +150 °C | No integrated temperature compensation; higher offset drift (> ±10% over temp); lower ESD (4 kV HBM) | Choose for extended temperature range where precision drift is less critical than ultimate operating ceiling |
Compared with US1881EUA-ABA-000-RE and A1120ELHLT-T, the SI7205-B-00-IV delivers superior magnetic sensitivity stability, built-in ISO 7637-2-2-11 resilience, and true omnipolar operation - making it the preferred choice for automotive and industrial designs demanding field-robust, maintenance-free position feedback.
Availability
SI7205-B-00-IV is available at Aetrix Electronics and suitable for automotive HVAC systems, industrial BLDC motor controllers, factory automation valve monitoring, and medical infusion pump mechanisms requiring stable component supply across extended temperature and voltage ranges.
Supply support for SI7205-B-00-IV includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Silicon Labs is a fabless semiconductor company specializing in mixed-signal ICs for sensing, connectivity, and timing, with design centers in Austin, Boston, and Taipei.
The Si720x family was engineered specifically for high-reliability magnetic position sensing in harsh environments - emphasizing low-drift performance, high-voltage tolerance, and automotive-grade EMC robustness without external compensation circuitry.
FAQ
What is the magnetic operate point specification for SI7205-B-00-IV?
The SI7205-B-00-IV has a maximum operate point (BOP) of 3.0 mT and a minimum release point (BRP) of 0.8 mT, measured at −40 to +125 °C. These values define the magnetic field thresholds at which the open-drain output switches state, with 0.6 mT hysteresis ensuring noise immunity. The SI7205-B-00-IV uses factory-programmed thresholds and does not support user adjustment.
Does SI7205-B-00-IV support unipolar or omnipolar magnetic field detection?
The SI7205-B-00-IV is configured as an omnipolar Hall-effect switch, meaning it responds to both north and south magnetic poles - triggering on either polarity exceeding the 3.0 mT BOP threshold. This eliminates magnet orientation constraints during mechanical assembly and improves reliability in dynamic field environments where pole direction may vary.
What is the recommended external circuitry for SI7205-B-00-IV's open-drain output?
The SI7205-B-00-IV open-drain output requires an external pull-up resistor to the host system's logic rail (e.g., 3.3 V or 5 V). A 4.7 kΩ resistor is typical for 3.3 V systems. For ISO 7637-2-2-11 transient protection on the output line, Silicon Labs recommends a 220 Ω series resistor and 0.1 µF local bypass capacitor to ground - identical to the VDD protection network.
Can SI7205-B-00-IV be used in automotive applications requiring ISO 7637-2 compliance?
Yes - the SI7205-B-00-IV is designed for automotive use with explicit support for ISO 7637-2-2-11 pulse testing on both VDD and OUT1 pins when implemented with a 220 Ω current-limiting resistor. Its 8 kV HBM ESD rating and 26.5 V absolute maximum supply further validate suitability for 12 V/24 V vehicle subsystems including HVAC, seat controls, and throttle position feedback.
Is SI7205-B-00-IV pin-compatible with other Si720x family members in SOT23-3 package?
Yes - all Si720x parts in SOT23-3 (including SI7201, SI7202, SI7205, SI7206) share identical pinout: Pin 1 = VDD, Pin 2 = OUT1, Pin 3 = GND. However, electrical behavior differs: SI7205-B-00-IV is a high-voltage omnipolar switch with open-drain output, while SI7201-B-00-FV is a low-voltage omnipolar switch with push-pull output - direct substitution requires verification of supply voltage and load interface.
SI7205-B-00-IV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Strip
- Product Status:
- Obsolete
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±3mT Trip, ±0.8mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 3.3V ~ 26.5V
- Current - Supply (Max):
- 950µA (Typ)
- Current - Output (Max):
- -
- Output Type:
- Open Drain
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SI7205-B-00-IV FAQ
1.How can I place an order for SI7205-B-00-IV through Aetrix?
Please submit a Request for Quotation (RFQ) for SI7205-B-00-IV on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SI7205-B-00-IV reliable?
The price and inventory of SI7205-B-00-IV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI7205-B-00-IV is usually 5 days.
3.What payment methods are accepted for SI7205-B-00-IV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI7205-B-00-IV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI7205-B-00-IV?
SI7205-B-00-IV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI7205-B-00-IV order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SI7205-B-00-IV?
For technical support, including SI7205-B-00-IV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI7205-B-00-IV requirements.
6.How does Aetrix verify that SI7205-B-00-IV is sourced from the original manufacturer or authorized distributors?
All SI7205-B-00-IV products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI7205-B-00-IV meets industry standards.
7.What is the process for return or replacement of SI7205-B-00-IV?
All SI7205-B-00-IV units undergo pre-shipment inspection (PSI). If there is an issue with SI7205-B-00-IV, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SI7205-B-00-IV part is unused and in its original packaging.
Return procedure for SI7205-B-00-IV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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