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Texas Instruments REF5025SHKQ
- Part No.:
- REF5025SHKQ
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-CSOIC (0.220", 5.65mm Width)
- Datasheet:
-
REF5025SHKQ.pdf
- Description:
- IC VREF SERIES 0.9% 8CFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,552
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Product details
Overview
REF5025SHKQ from Texas Instruments is a low-noise, very-low-drift, precision 2.5 V voltage reference IC designed for high-accuracy data acquisition systems. It delivers ±7 mA output current, 40 ppm/°C max temperature drift over –55°C to +210°C, 3 μVPP/V noise, and initial accuracy of ±0.9% - enabling stable reference performance in aerospace-grade instrumentation and high-reliability industrial control.
For engineers reviewing the REF5025SHKQ datasheet, REF5025SHKQ pinout, REF5025SHKQ application, or REF5025SHKQ equivalent, this page provides verified technical context, package-specific pin functions, real-world design implications of TRIM/NR filtering and TEMP monitoring, and validated alternative options for extreme-temperature precision reference designs.
Technical Context
The REF5025SHKQ implements a proprietary bandgap core with buffered output amplifier capable of both sourcing and sinking up to ±7 mA while maintaining <40 ppm/°C drift across –55°C to +210°C. Its TRIM/NR pin provides direct access to the internal bandgap node, enabling external RC filtering (e.g., 1 µF to GND) to reduce 0.1–10 Hz noise by 50%.
It integrates a dedicated TEMP pin (pin 3) delivering 575 mV at 25°C with 2.64 mV/°C slope and ~60 kΩ output impedance - intended for on-die temperature monitoring or analog compensation, not precision sensing. The device requires 1–50 µF output capacitance with 1–1.5 Ω ESR for stability and specifies 200 µs turn-on settling time to 0.1% with 1 µF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal; factory-trimmed for ±0.9% initial accuracy at 25°C - sets absolute scaling for 16-bit ADCs without calibration. |
| Temp Drift | 40 ppm/°C max over –55°C to +210°C - contributes ≤±10.4 mV error across full range, critical for uncooled avionics sensors. |
| Noise (0.1–10 Hz) | 7.5 μVPP typical - limits effective resolution in low-frequency precision measurements; halved using TRIM/NR 1 µF filter. |
| Output Current | ±7 mA - supports direct driving of SAR ADC reference inputs and op-amp bias networks without external buffers. |
| Input Voltage Range | 3.25 V to 18 V - allows operation from 5 V or 12 V rails with ≥0.75 V headroom; dropout voltage remains <0.8 V at full load. |
| PSRR | ≥60 dB at 1 kHz - rejects supply ripple in noisy switching power domains common in motor-control PCBs. |
| Quiescent Current | 0.8–1.5 mA - enables low-power operation in battery-backed instrumentation with minimal thermal drift impact. |
Pinout & Package
REF5025SHKQ uses an 8-pin CFP (Ceramic Flatpack) HKQ package (6.9 mm × 5.65 mm), a "dead bug" variant of the HKJ package optimized for high-reliability hermetic sealing and thermal cycling endurance in aerospace applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DNC (1, 8) | Do Not Connect | Unbonded pads; must remain floating - solder mask coverage required to prevent contamination-induced leakage. |
| VIN (2) | Power Input | Accepts 3.25–18 V; requires 1–10 µF bypass capacitor close to pin to suppress supply transients and ensure PSRR performance. |
| TEMP (3) | Temperature Monitor Output | Provides 575 mV @ 25°C +2.64 mV/°C; high-impedance (60 kΩ) - must be buffered (e.g., OPA335) before ADC sampling to avoid loading error. |
| GND (4) | System Ground | Primary return path for output current and internal circuitry; requires low-inductance connection to minimize ground bounce in high-speed DAQ systems. |
| TRIM/NR (5) | Bandgap Access & Noise Filter | Connect 1 µF to GND to create ~15 Hz low-pass filter - reduces 0.1–10 Hz noise by 50%, at cost of increased start-up time (~2×). |
| VOUT (6) | Precision Reference Output | 2.5 V ±0.9%; requires 1–50 µF output capacitor with 1–1.5 Ω ESR to maintain stability and minimize gain peaking-induced noise. |
| NC (7) | No Internal Connection | Internally open; may be grounded or left floating per layout requirements - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Extended Temperature Operation | Specified from –55°C to +210°C - qualified for downhole drilling tools, jet engine controllers, and space-grade electronics without derating. |
| Bipolar Output Drive | ±7 mA sourcing/sinking capability - eliminates need for external buffer op-amps when driving switched-capacitor ADC references or precision DACs. |
| On-Die Temperature Monitoring | Integrated TEMP pin with calibrated 2.64 mV/°C slope - enables real-time thermal compensation of sensor front-ends without discrete thermistors. |
| Bandgap Noise Reduction | TRIM/NR pin exposes internal bandgap node - adding 1 µF capacitor cuts 0.1–10 Hz noise in half, directly improving ENOB in 16-bit data converters. |
| Controlled Baseline Manufacturing | Single assembly/test site and single fabrication site - ensures lot-to-lot parametric consistency critical for medical and defense qualification programs. |
Applications
| 16-Bit Data Acquisition Systems | High-Temperature Industrial Process Control |
|---|---|
Use Scenario: Precision analog input conditioning for pipeline or SAR ADCs in oilfield logging tools operating at 175°C ambient. IC Role / Device Role / Timing Role: Primary 2.5 V reference for ADS8326-type converters, providing absolute voltage scaling and noise floor control. Use Value: 40 ppm/°C drift and 7.5 μVPP noise ensure <1 LSB error over full temperature range without recalibration. |
Use Scenario: Closed-loop feedback reference in turbine exhaust gas temperature controllers exposed to 200°C cabinet environments. IC Role / Device Role / Timing Role: Stable excitation source for RTD bridge circuits and reference for analog output drivers (4–20 mA loops). Use Value: ±7 mA drive strength powers Wheatstone bridges directly; TEMP pin enables self-compensation of amplifier offset drift. |
| Aerospace Avionics Sensors | Medical Imaging Signal Chains |
Use Scenario: Reference for radiation-tolerant ADCs in satellite star trackers requiring 10-year mission life at junction temperatures up to 105°C. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage基准 for analog front-end gain stages and ADC reference inputs in inertial measurement units. Use Value: Extended product lifecycle and controlled baseline manufacturing support DO-254 certification and long-term BOM stability. |
Use Scenario: High-fidelity reference in portable ultrasound beamformer ASICs where thermal gradients cause baseline drift in analog receive paths. IC Role / Device Role / Timing Role: 2.5 V reference for time-of-flight ADCs and programmable gain amplifiers in multi-channel echo processing chains. Use Value: TRIM/NR 1 µF filtering reduces sub-10 Hz noise critical for Doppler signal integrity; ±7 mA drive supports multiple parallel channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5025AIDR | SOIC-8 package; 3 ppm/°C max drift (–40°C to +125°C); 0.05% initial accuracy; 1.2 μVPP/V noise; rated only to +125°C. | Targets commercial/industrial DAQ boards, not extended-temp or hermetic systems; lacks TEMP pin and TRIM/NR functionality. | Select for cost-sensitive, non-military applications where full –55°C to +210°C range and on-die temperature monitoring are unnecessary. |
| ADR4525BRTZ-R7 | SOT-23-5 package; 3 ppm/°C max drift (–40°C to +125°C); 0.02% initial accuracy; 1.75 μVPP/V noise; no TEMP or TRIM pins; 10 mA output. | Optimized for space-constrained portable instrumentation; no high-temp qualification or military screening; no integrated temp monitoring. | Choose when board area is critical and operating temperature stays below 125°C; avoid where thermal compensation or extreme environment reliability is required. |
Compared with REF5025SHKQ, REF5025AIDR offers tighter drift and accuracy in standard temperature ranges but sacrifices military-grade packaging, extended temperature operation, and diagnostic features like TEMP monitoring. ADR4525BRTZ-R7 delivers superior noise and accuracy in compact form but lacks the robustness, thermal range, and system-level features needed for aerospace or downhole use.
Availability
REF5025SHKQ is available at Aetrix Electronics and suitable for aerospace instrumentation, downhole drilling systems, and high-reliability industrial process control requiring stable component supply across extended temperature and long-life program cycles.
Supply support for REF5025SHKQ 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, high-reliability ICs, and industrial-grade signal chain solutions.
The REF50xx family is engineered for ultra-stable voltage references in safety-critical and extreme-environment applications - emphasizing low drift, low noise, and extended temperature operation for data acquisition, test equipment, and aerospace systems.
FAQ
What is the maximum operating temperature of the REF5025SHKQ?
The REF5025SHKQ is fully specified and tested from –55°C to +210°C, with guaranteed performance including 40 ppm/°C max drift, ±7 mA output current, and 7.5 μVPP noise across this entire range. Its CFP-HKQ ceramic package and die construction enable reliable operation in jet engine controllers and downhole tools where ambient temperatures exceed 175°C.
Does the REF5025SHKQ include a temperature monitoring pin?
Yes, the REF5025SHKQ includes a dedicated TEMP pin (pin 3) that outputs a voltage proportional to die temperature: 575 mV at 25°C with a slope of 2.64 mV/°C. This pin has ~60 kΩ output impedance and must be buffered with a low-drift op-amp (e.g., OPA335) before connection to an ADC to avoid loading errors - it is intended for thermal compensation, not precision temperature measurement.
How does the TRIM/NR pin reduce noise in the REF5025SHKQ?
The TRIM/NR pin (pin 5) provides direct access to the internal bandgap node. Connecting a 1 µF capacitor from TRIM/NR to GND creates a low-pass filter with corner frequency ~15 Hz, reducing 0.1–10 Hz output noise by approximately 50%. This directly improves effective number of bits (ENOB) in precision data acquisition systems, though it increases turn-on settling time from 200 µs to ~400 µs.
What output capacitance is required for stable operation of the REF5025SHKQ?
The REF5025SHKQ requires an output capacitor between 1 µF and 50 µF with an ESR of 1–1.5 Ω for optimal stability and noise performance. Ceramic capacitors with low ESR (<100 mΩ) can cause gain peaking and increased noise; tantalum or polymer capacitors within the specified ESR range are preferred. Layout must minimize trace inductance between VOUT and capacitor.
Is the REF5025SHKQ pin-compatible with other REF5025 variants?
The REF5025SHKQ shares identical pin configuration and function mapping with the REF5025-HT HKJ package (pins: DNC, VIN, TEMP, GND, TRIM/NR, VOUT, NC, DNC), but differs in mechanical construction - HKQ is a "dead bug" variant with inverted die orientation for enhanced thermal and hermetic performance. Electrical behavior and pinout are identical; PCB layout must accommodate HKQ's specific footprint and sealing requirements.
REF5025SHKQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-CSOIC (0.220", 5.65mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 7 mA
- Tolerance:
- ±0.9%
- Temperature Coefficient:
- 40ppm/°C
- Noise - 0.1Hz to 10Hz:
- 7.5µVpp/V
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.25V ~ 18V
- Current - Supply:
- 1.5mA
- Current - Cathode:
- -
- Operating Temperature:
- -55°C ~ 210°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-CFP
REF5025SHKQ FAQ
1.How can I place an order for REF5025SHKQ through Aetrix?
Please submit a Request for Quotation (RFQ) for REF5025SHKQ 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 REF5025SHKQ reliable?
The price and inventory of REF5025SHKQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF5025SHKQ is usually 5 days.
3.What payment methods are accepted for REF5025SHKQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF5025SHKQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF5025SHKQ?
REF5025SHKQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF5025SHKQ 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 REF5025SHKQ?
For technical support, including REF5025SHKQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF5025SHKQ requirements.
6.How does Aetrix verify that REF5025SHKQ is sourced from the original manufacturer or authorized distributors?
All REF5025SHKQ 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 REF5025SHKQ meets industry standards.
7.What is the process for return or replacement of REF5025SHKQ?
All REF5025SHKQ units undergo pre-shipment inspection (PSI). If there is an issue with REF5025SHKQ, 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 REF5025SHKQ part is unused and in its original packaging.
Return procedure for REF5025SHKQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF5025SHKQ Tags
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