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Texas Instruments REF7012QFKHT
- Part No.:
- REF7012QFKHT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-CLCC
- Datasheet:
-
REF7012QFKHT.pdf
- Description:
- IC VREF SERIES 1.25V 8CLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,220
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Product details
Overview
REF7012QFKHT from Texas Instruments is a precision 1.25 V series voltage reference IC designed for high-resolution data acquisition signal chains. It delivers ±0.025% initial accuracy, 2 ppm/°C max temperature drift (−40°C to +125°C), and ultra-low 0.25 ppmp-p (0.1–10 Hz) noise - enabling sub-18-bit ADC performance in semiconductor test equipment and industrial PLC analog I/O modules.
For engineers reviewing the REF7012QFKHT datasheet, REF7012QFKHT pinout, REF7012QFKHT application, or REF7012QFKHT equivalent, this page provides verified specifications, LCCC-8 package terminal mapping, real-world use cases in medical imaging front-ends and field transmitters, and two validated alternative options with documented functional trade-offs.
Technical Context
The REF7012QFKHT implements a bandgap-based series reference architecture with dual-output force/sense topology (OUTF/OUTS) to reject PCB trace resistance effects under load. Its internal low-dropout regulator supports operation down to 2.75 V input with only 400 mV dropout at ±10 mA output current.
It features an enable pin (EN) with internal pull-up, allowing shutdown mode (5–12 µA quiescent current) and fast 0.5 ms turn-on settling. The hermetic LCCC-8 (FKH) package ensures humidity resistance and long-term stability of 35 ppm over 1000 hours at 35°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25 V nominal; enables direct biasing of 1.25 V reference inputs in precision DACs like DAC11001A without level-shifting. |
| Initial Accuracy | ±0.025% at 25°C; reduces calibration burden in automated test equipment requiring <10 ppm system error budgets. |
| Temp Drift | 2 ppm/°C max (−40°C to +125°C); maintains <25 ppm total drift across full industrial range, critical for uncalibrated field transmitters. |
| Low-Frequency Noise | 0.25 ppmp-p (0.1–10 Hz); supports 24-bit delta-sigma ADCs (e.g., ADS127L01) in ultrasound scanner analog front-ends. |
| PSRR | 107 dB at 1 kHz; rejects switching regulator ripple in mixed-signal PLC modules without additional filtering. |
| Dropout Voltage | 400 mV at ±10 mA; allows operation from 1.65 V supply rails in battery-powered portable instrumentation. |
| Stable Capacitance | 1–100 µF output capacitor range; accommodates low-ESR polymer caps in space-constrained industrial designs. |
Pinout & Package
LCCC-8 (FKH) hermetic ceramic package: 5.00 mm × 5.00 mm body, surface-mount, moisture-resistant, optimized for long-term drift stability in calibration-critical systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high logic; internal pull-up ensures default-on operation; drives >1.6 V to enable, <0.5 V to enter 5–12 µA shutdown mode. |
| 2 - VIN | Power input | Accepts 2.75–18 V; requires ≥0.1 µF decoupling cap to ground for PSRR optimization and noise suppression. |
| 3,4,5,8 - GND | Ground terminals | Four dedicated ground pins minimize ground bounce and improve load regulation under dynamic current steps up to ±10 mA. |
| 6 - OUTS | Sense input | High-impedance feedback node; connects directly to load-side of sense resistor or ADC reference input to eliminate trace IR drop error. |
| 7 - OUTF | Force output | Delivers regulated 1.25 V; must be connected to OUTS externally for closed-loop operation; drives capacitive loads up to 100 µF. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1/f noise | 0.25 ppmp-p (0.1–10 Hz) enables <1 LSB noise floor in 24-bit weight scale systems with 10 SPS sampling. |
| Hermetic LCCC packaging | Eliminates humidity-induced drift; achieves 35 ppm long-term stability over 1000 hours - essential for recalibration-free X-ray detector modules. |
| Force/sense topology | Separates OUTF (power delivery) and OUTS (feedback sensing) to maintain ±0.025% accuracy despite 100 mΩ PCB trace resistance. |
| Wide input voltage range | Operates from 2.75 V to 18 V - supports single-supply designs in both 3.3 V industrial sensors and 15 V legacy test equipment. |
| High PSRR | 107 dB at 1 kHz suppresses DC-DC converter switching noise, reducing need for ferrite beads in compact PLC analog I/O boards. |
Applications
| Semiconductor Test Equipment | Precision Data Acquisition Systems |
|---|---|
Use Scenario: Automated wafer probing with multi-channel parametric testers requiring stable reference for 20+ bit DAC/ADC stimulus/response. IC Role / Device Role / Timing Role: Primary voltage reference for stimulus generation and measurement front-end; referenced by ADS8900B SAR ADCs and DAC11001A. Use Value: 2 ppm/°C drift and 0.25 ppmp-p noise ensure <±1 LSB error across temperature and time, eliminating per-wafer recalibration. |
Use Scenario: High-channel-count data loggers in oil & gas pipeline monitoring, capturing strain gauge and RTD signals over −40°C to +85°C. IC Role / Device Role / Timing Role: Precision reference for multiplexed 24-bit delta-sigma ADCs (e.g., ADS127L01) in isolated analog input modules. Use Value: Force/sense outputs compensate for PCB trace resistance in modular backplane designs, preserving ±0.025% system accuracy. |
| Ultrasound Scanner | Industrial Instrumentation |
Use Scenario: Beamforming analog front-end in portable ultrasound systems where low-noise reference directly impacts image SNR. IC Role / Device Role / Timing Role: Reference source for time-gain compensation (TGC) DACs and receive-path ADCs in channel density >128. Use Value: 0.25 ppmp-p 1/f noise prevents low-frequency artifacts in B-mode imaging; hermetic LCCC prevents moisture-induced baseline drift. |
Use Scenario: Loop-powered 4–20 mA field transmitter with HART modulation, operating continuously at 85°C ambient in process plants. IC Role / Device Role / Timing Role: Stable 1.25 V reference for microcontroller ADC and DAC used in sensor linearization and digital calibration. Use Value: 125°C-rated operation and 35 ppm long-term stability allow 10-year field deployment without recalibration or drift-related maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF7012QDGKR | VSSOP-8 package; 4.2 ppm/°C max drift (−40°C to +125°C); 37 ppm long-term stability (1000 h) | Higher thermal hysteresis (410 ppm vs. 18 ppm) limits use in cyclic temperature environments like outdoor weather stations. | Select for cost-sensitive, space-constrained PCBs where hermetic sealing is not required and recalibration is acceptable. |
| ADR4512B | SOIC-8; 3 ppm/°C max drift; 0.28 ppmp-p noise; no enable pin; 1.25 V output; 10 µA quiescent current | Lacks EN pin and force/sense outputs - unsuitable for high-accuracy remote sensing or low-power shutdown modes. | Choose when board area is constrained and shutdown functionality is unnecessary; verify PSRR (95 dB) meets switching noise rejection needs. |
Compared with REF7012QFKHT, REF7012QDGKR trades hermetic stability for smaller footprint and lower cost, while ADR4512B offers comparable accuracy but lacks enable control and force/sense architecture - making REF7012QFKHT uniquely suited for recalibration-free, low-noise, remotely sensed industrial and medical applications.
Availability
REF7012QFKHT is available at Aetrix Electronics and suitable for semiconductor test equipment, precision data acquisition systems, and industrial instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for REF7012QFKHT 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 signal chain components.
The REF70 family was developed specifically for high-resolution data converters in test & measurement and medical imaging, addressing the need for ultra-low noise, low drift, and long-term stability in harsh industrial environments.
FAQ
What is the maximum operating temperature for REF7012QFKHT?
The REF7012QFKHT is fully specified from −40°C to +125°C ambient temperature. Its LCCC-8 hermetic package enables reliable operation at 125°C continuous, making it suitable for under-hood automotive subsystems and high-temperature industrial enclosures where standard plastic packages fail.
Does REF7012QFKHT require external capacitors, and what values are supported?
Yes, REF7012QFKHT requires a minimum 0.1 µF input capacitor on VIN and supports 1–100 µF output capacitance on OUTF. The wide output capacitor range allows use of low-ESR polymer or tantalum capacitors in space-constrained designs without stability risk - confirmed across −40°C to +125°C.
How does the force/sense (OUTF/OUTS) configuration improve accuracy in REF7012QFKHT?
The REF7012QFKHT uses separate OUTF (force) and OUTS (sense) pins to close the regulation loop at the load point. This compensates for voltage drop across PCB traces or connectors, maintaining ±0.025% output accuracy even with 100 mΩ series resistance - critical for remote sensor interfaces in PLC analog I/O modules.
What is the typical quiescent current of REF7012QFKHT in active and shutdown modes?
In active mode, REF7012QFKHT draws 4–7.5 mA (depending on temperature); in shutdown mode (EN < 0.5 V), it draws 5–12 µA. This enables low-power wake-up architectures in battery-operated field transmitters, where the reference remains off until measurement cycles begin.
Can REF7012QFKHT drive ±10 mA output current while maintaining its specified accuracy?
Yes - REF7012QFKHT is rated for ±10 mA output current with ≤15 ppm/mA load regulation (≤150 ppm total error across full load range). Combined with 400 mV dropout at 10 mA, it sustains 1.25 V output from as low as 1.65 V input, supporting low-voltage portable instrumentation.
REF7012QFKHT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-CLCC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.025%
- Temperature Coefficient:
- 2ppm/°C
- Noise - 0.1Hz to 10Hz:
- 0.25ppmp-p
- Noise - 10Hz to 10kHz:
- 0.35ppmrms
- Voltage - Input:
- 2.75V ~ 18V
- Current - Supply:
- 6.5mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LCCC (5x5)
REF7012QFKHT FAQ
1.How can I place an order for REF7012QFKHT through Aetrix?
Please submit a Request for Quotation (RFQ) for REF7012QFKHT 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 REF7012QFKHT reliable?
The price and inventory of REF7012QFKHT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF7012QFKHT is usually 5 days.
3.What payment methods are accepted for REF7012QFKHT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF7012QFKHT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF7012QFKHT?
REF7012QFKHT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF7012QFKHT 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 REF7012QFKHT?
For technical support, including REF7012QFKHT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF7012QFKHT requirements.
6.How does Aetrix verify that REF7012QFKHT is sourced from the original manufacturer or authorized distributors?
All REF7012QFKHT 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 REF7012QFKHT meets industry standards.
7.What is the process for return or replacement of REF7012QFKHT?
All REF7012QFKHT units undergo pre-shipment inspection (PSI). If there is an issue with REF7012QFKHT, 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 REF7012QFKHT part is unused and in its original packaging.
Return procedure for REF7012QFKHT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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