Silicon Labs SI7210-B-03-IVR

Overview

SI7210-B-03-IVR from Silicon Labs is a programmable I²C Hall effect magnetic position and temperature sensor in SOT23-5 package, featuring 13-bit ADC resolution, ±20 mT full-scale range, ±1°C temperature accuracy, and 50 nA sleep current. It delivers precise z-axis magnetic field measurement for contactless position sensing in industrial encoders and fluid level systems.

For engineers reviewing the SI7210-B-03-IVR datasheet, SI7210-B-03-IVR pinout, SI7210-B-03-IVR application, or SI7210-B-03-IVR equivalent, key selection considerations include its factory-configured 20 mT range, fixed SOT23-5 pinout with open-drain ALERT output, I²C address 0x30, and integrated temperature compensation optimized for neodymium magnets.

Technical Context

The SI7210-B-03-IVR implements a chopper-stabilized Hall element with digital signal processing for real-time temperature and offset drift compensation. Its 13-bit signal path supports configurable digital filtering (FIR/IIR) and burst-mode sampling up to 20 kHz bandwidth.

It operates across 1.7–5.5 V supply and -40°C to +125°C ambient, with factory-programmed I²C address 0x30, 20 mT full-scale range, and open-drain ALERT output configured for omnipolar switching with user-adjustable BOP/BRP thresholds via registers 0xC6–0xC7.

Key Specifications

Pinout & Package

SI7210-B-03-IVR uses the industry-standard SOT23-5 surface-mount package (1.6 × 1.4 × 1.1 mm), optimized for space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall effect magnetic sensor applications.

Compared with A1324LLHLT-T, SI7210-B-03-IVR adds digital configurability and ultra-low-power sleep; compared with MLX90393ELD-ABA-000-TU, it offers lower system cost and simpler firmware integration for single-axis z-field sensing with stringent battery-life requirements.

Availability

SI7210-B-03-IVR is available at Aetrix Electronics and suitable for industrial encoders, utility metering, and consumer HMI requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for SI7210-B-03-IVR 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 secure, intelligent wireless and sensing solutions for IoT, industrial, and automotive markets.

The Si7210 family was designed specifically for high-accuracy, low-power magnetic position sensing in space-constrained, battery-operated, and safety-critical applications-emphasizing factory-calibrated performance and robust EMC behavior.

FAQ

What is the factory-configured I²C address and full-scale range for SI7210-B-03-IVR?

The SI7210-B-03-IVR has a factory-programmed 7-bit I²C address of 0x30 and a fixed full-scale magnetic range of ±20 mT. This configuration is laser-trimmed during manufacturing and cannot be altered post-production. The 20 mT scale provides 0.00125 mT/LSB resolution and is optimized for use with small neodymium magnets in proximity sensing applications. All register access-including field data, temperature, and ALERT configuration-must use this address.

Does SI7210-B-03-IVR support temperature measurement, and what is its accuracy?

Yes, SI7210-B-03-IVR integrates an on-die temperature sensor accessible via I²C register 0xC4 (dspsigsel = 0x01). Its accuracy is ±1°C over -10°C to +85°C ambient for the SOT23-5 package, as specified in Table 1.7 of the datasheet. This value reflects post-gain-and-offset correction error and is independent of magnetic field measurements. The temperature data shares the same 13-bit output path and is updated synchronously with magnetic field conversions.

What is the function of the ALERT pin on SI7210-B-03-IVR, and how is it configured?

The ALERT pin on SI7210-B-03-IVR is a factory-configured open-drain digital output that asserts low when the measured magnetic field crosses user-defined operate (BOP) and release (BRP) thresholds. Configuration is performed via I²C registers 0xC6 (sw_op) and 0xC7 (sw_hyst), supporting omnipolar, unipolar, or latch modes. Unlike programmable variants, SI7210-B-03-IVR's ALERT output type (open-drain) and default polarity are fixed at manufacture and cannot be changed via software.

Can SI7210-B-03-IVR operate from a 1.8 V supply, and what is its active current draw?

Yes, SI7210-B-03-IVR supports 1.71–5.5 V supply voltage, making it fully compatible with 1.8 V systems. At 1.8 V, typical active-mode current consumption during conversion is 3.5 mA (Table 1.2). In idle mode-where the analog front-end remains powered between measurements-current is 360–1000 µA depending on configuration. For lowest power, the device enters sleep mode drawing just 50 nA at 3.3 V and 25°C, waking automatically every factory-set interval (1–20 ms) to take a measurement.

Is SI7210-B-03-IVR suitable for automotive applications, and what is its temperature rating?

SI7210-B-03-IVR is rated for operation from -40°C to +125°C ambient (Table 1.1), meeting AEC-Q200 stress test requirements for passive components but not certified for automotive IC qualification. Its design targets industrial and consumer applications such as smart meters, HVAC controls, and appliance HMI. While the junction temperature capability supports under-hood environments, system-level validation-including EMC, vibration, and extended life testing-is required before deployment in safety-critical automotive subsystems. Silicon Labs does not list SI7210-B-03-IVR in its automotive-grade product portfolio.