Texas Instruments REF7025QFKHT

Overview

REF7025QFKHT from Texas Instruments is a precision 2.5 V series voltage reference in an 8-pin LCCC hermetic ceramic package, delivering ±0.025% initial accuracy, 2 ppm/°C max temperature drift (−40°C to +125°C), 0.23 ppmp-p 0.1–10 Hz noise, and ±10 mA output current. It serves as the stable reference backbone in high-resolution data acquisition systems paired with ADCs like ADS127L01.

For engineers reviewing the REF7025QFKHT datasheet, REF7025QFKHT pinout, REF7025QFKHT application, or REF7025QFKHT equivalent, key selection criteria include low 1/f noise for sub-µV measurement integrity, hermetic LCCC packaging for long-term stability in uncalibrated industrial instrumentation, and dropout voltage ≤400 mV at 10 mA load across extended temperature range.

Technical Context

The REF7025QFKHT implements a precision bandgap-based series reference architecture with dual-output force-sense topology (OUTF/OUTS) to reject PCB trace resistance effects under varying load. Its internal enable circuitry supports shutdown mode with <12 µA quiescent current and 1.6 V logic-compatible activation threshold.

Designed for signal-chain criticality, it achieves 107 dB PSRR at 1 kHz and maintains stability with 1–100 µF low-ESR output capacitors-enabling robust operation in noisy industrial power environments where supply ripple rejection and thermal hysteresis (<180 ppm over −40°C to +125°C cycle) directly impact system calibration validity.

Key Specifications

Pinout & Package

REF7025QFKHT uses an 8-pin LCCC (Leadless Ceramic Chip Carrier) package, 5.00 mm × 5.00 mm, hermetically sealed for humidity resistance and long-term drift control in harsh environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with ADR4525BRTZ-REEL7 and LT6657AHMS8-2.5#PBF, REF7025QFKHT uniquely combines hermetic LCCC packaging, enable functionality, and force-sense architecture-making it the only option among the three qualified for uncalibrated 15-year deployments in safety-critical medical and energy infrastructure applications.

Availability

REF7025QFKHT is available at Aetrix Electronics and suitable for semiconductor test equipment, precision medical imaging systems, and industrial process instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for REF7025QFKHT 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

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog ICs for industrial, automotive, and medical markets.

The REF70 family was designed specifically to address the noise, drift, and long-term stability requirements of next-generation high-resolution data converters in test and measurement and medical imaging-where reference performance directly limits overall system accuracy.

FAQ

What is the maximum allowable input voltage for REF7025QFKHT?

The absolute maximum input voltage for REF7025QFKHT is 20 V, but the recommended operating range is VOUT + VDO (minimum 2.9 V) to 18 V. At 10 mA load and −40°C to +125°C, VDO reaches 400 mV, so minimum VIN is 2.9 V. Exceeding 18 V continuously risks reliability degradation per TI's absolute maximum ratings table.

Does REF7025QFKHT require external capacitors, and what values are supported?

Yes, REF7025QFKHT requires a minimum 0.1 µF input capacitor and supports 1–100 µF output capacitors with ESR between 1 mΩ and 400 mΩ. The wide output capacitance range simplifies design in space-constrained applications like portable test gear, and the low-ESR tolerance avoids instability issues common with polymer or MLCC types.

How does the force-sense (OUTF/OUTS) configuration improve accuracy in REF7025QFKHT?

The OUTF/OUTS configuration in REF7025QFKHT enables remote sensing at the load point, compensating for voltage drop across PCB traces or connectors. When OUTS is connected directly to the load-side ground or reference node, the internal amplifier adjusts OUTF to maintain exact 2.5 V at the sense point-reducing errors from trace resistance up to ~1 Ω, critical in high-precision PLC analog I/O modules.

What is the long-term stability specification for REF7025QFKHT, and how is it measured?

REF7025QFKHT delivers 35 ppm long-term stability over 1000 hours at 35°C, measured per JEDEC JESD22-A117. This value reflects real-world aging under accelerated thermal stress and is validated on units in the LCCC (FKH) package. It is significantly better than the DGK-package variant (75 ppm), confirming the hermetic ceramic construction's role in minimizing time-dependent drift.

Can REF7025QFKHT operate in shutdown mode, and what is its quiescent current in that state?

Yes, REF7025QFKHT supports shutdown mode via the EN pin: driving EN <0.5 V disables the output and reduces quiescent current to 5–12 µA across −40°C to +125°C. This feature enables power cycling in battery-operated semiconductor test fixtures, extending operational life while maintaining fast 0.5 ms turn-on time when reactivated.