The BLR3XX series is the third-generation high-precision voltage reference launched by Shanghai Belling. It features high output accuracy, low power consumption, low noise, and low temperature coefficient.

This series adopts Shanghai Belling's patented core architecture to achieve high precision, while improved thermal management enhances system accuracy.

With a maximum operating current of 110μA and a low dropout voltage of 100mV, the BLR3XX voltage reference is well-suited for industrial control equipment.

Compatible with three package types—SOT-23-3, SOT23-6, and MSOP8—each offers multiple output voltage versions. All devices support an extended industrial temperature range of -40°C to +125°C across a wide input voltage range.

Application Scenarios

Precision Data Acquisition Systems

High-Resolution Data Converters

High-Precision Measurement Instruments

Industrial Instrumentation

Medical Equipment

Automotive Battery Monitoring

Selection Guide 

Parameter Comparison 

The BLR3XX series demonstrates significant improvements over Belling's first and second-generation voltage references, with optimized power consumption and enhanced current load capability up to +25mA.

Additionally, the BLR3XX series offers comprehensive packaging solutions tailored for diverse application scenarios.

Pin Configuration

MSOP8 Pin Configuration (Top View) 

SSOT-23-3 Pin Configuration (Top View)

SOT23-6 Pin Configuration (Top View)

Note:

NIC=NOT INTERNALLY CONNECTED.

Core Performance

Low Temperature Drift

The BLR3XX series features low temperature drift characteristics. As shown in the BLR325C model data below, it maintains a drift of 5ppm/°C across the full temperature range, meeting external reference requirements for various applications including ADC/DAC. 

BLR325C Output Voltage Temperature Drift Curve

High Load Capability

The BLR3XX series voltage reference features high load capability, supporting up to 25mA load current with a maximum load regulation of 80ppm across the full temperature range. This ensures stable performance in high-load applications requiring precise external voltage references.

Load Regulation and Temperature curve (Sourcing Current)

Low Noise

In high-precision applications, noise is a critical parameter affecting system performance. As shown in the figure below, the BLR325C delivers noise performance of 15μVp-p, meeting external reference requirements for precision test systems. 

BLR325C Output Voltage Noise (0.1Hz-10Hz)

Low Power Consumption

The BLR3XX series consumes 10uA in shutdown mode, with a typical operating current of 80uA and maximum current below 110uA for the entire series. Within the rated input voltage range at room temperature, it can provide up to 25mA source current and 10mA sink current to the load. 

Supply Current vs. Temperature

Application Solutions

Bipolar Output Voltage Reference

Bipolar Voltage Reference Configuration

By connecting the output of the BLR3XX series to the inverting input of an operational amplifier, both positive and negative reference voltages can be obtained simultaneously.

Enhanced Output Current Capability

Enhanced Output Current Reference Circuit

The circuit below enables high-current drive applications without sacrificing precision.