REF7012QFKHT

Overview

The REF7012QFKHT is an ultra-high-precision series voltage reference manufactured by Texas Instruments. It provides a fixed output voltage of 1.25 V with an initial accuracy of ±0.025%. The device features a low temperature coefficient of 2 ppm/°C and operates within a wide input voltage range up to 18 V. It supports an output current of ±10 mA and includes no shutdown functionality. The component utilizes an 8-LCCC (LCCC-8) surface-mount package and functions across a temperature range from -40°C to +125°C.

Feature Summary

• Ultra-low noise performance with 0.23 ppm pp for 0.1 Hz to 10 Hz and 0.35 ppm rms for 10 Hz to 1 kHz
• High power supply rejection ratio (PSRR) of 107 dB at 1 kHz
• Moisture-sealed ceramic LCCC package ensuring long-term stability without calibration
• Low dropout voltage of 400 mV with stable operation using 1 μF to 100 μF output capacitors

Applications

• Precision data acquisition systems
• Medical ultrasound scanners
• X-ray imaging systems
• Semiconductor test equipment
• Industrial instruments and PLC analog I/O modules

Procurement Notes

Verify the specific suffix QFKHT to confirm the moisture-sealed ceramic LCCC package and automotive-grade qualification. Ensure compatibility with the required 1.25 V output level and ±10 mA load current. Confirm that the absence of a shutdown pin aligns with the system design requirements, as this variant lacks power-down control. Validate thermal management strategies for the LCCC-8 package under maximum operating temperatures.

Selection Notes

Select this component when designing signal chains requiring minimal drift and noise for high-resolution converters. The 1.25 V output suits applications needing lower reference levels compared to standard 2.5 V or 5 V options. The ceramic package is preferred over plastic variants for environments demanding superior hermeticity and long-term reliability. Consider the lack of shutdown capability if power conservation during idle states is a critical design constraint.

Part Context

This part belongs to the REF70 family of ultra-high-precision voltage references designed for demanding measurement applications. The family offers various fixed output voltages including 2.5 V, 3 V, 3.3 V, 4.096 V, and 5 V. The REF7012QFKHT specifically addresses needs for low-voltage precision references in compact, robust packages suitable for harsh industrial and medical environments.

Replacement Considerations

Other members of the REF70 family such as REF7025QFKHT or REF7050QFKHT share identical electrical characteristics and packaging but provide different fixed output voltages. Substitution requires verifying that the system circuitry can accommodate the alternative reference voltage level without modification.