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Texas Instruments REF02AU/2K5
- Part No.:
- REF02AU/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF02AU/2K5.pdf
- Description:
- IC VREF SERIES 0.3% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,824
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Product details
Overview
REF02AU/2K5 from Texas Instruments is a precision +5V voltage reference IC with ±0.2% initial accuracy, 10ppm/°C max temperature drift over –40°C to +85°C, and 10µVPP low-frequency noise (0.1Hz–10Hz). It operates from 8V to 40V supply, draws ≤1.4mA quiescent current, and delivers up to ±21mA load capability - ideal for high-accuracy A/D and D/A converter biasing in industrial test equipment.
For engineers reviewing the REF02AU/2K5 datasheet, REF02AU/2K5 pinout, REF02AU/2K5 application, or REF02AU/2K5 equivalent, key selection criteria include its SOIC-8 package, trimmable ±6% output adjustment range, guaranteed line regulation (0.01%/V max), load regulation (0.008%/mA max), and long-term stability (100ppm first 1000h).
Technical Context
The REF02AU/2K5 implements a laser-trimmed bandgap core with external temperature compensation and a dedicated Trim pin enabling ±150mV output adjustment without degrading temperature coefficient beyond 0.7ppm/°C per 100mV shift. Its internal architecture supports stable operation under wide input voltage variation and capacitive loading on the Temp pin.
It features short-circuit protection, indefinite output short duration, and thermal shutdown behavior defined by θJA = 80°C/W (SOIC-8). The device provides a buffered temperature-sensing voltage (630mV at +25°C, 2.1mV/°C) on Pin 3, insensitive to capacitive loading but sensitive to current draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +5.000V ±15mV at +25°C - enables binary-compatible 5.12V trimming for 8-bit systems |
| Temp Drift | ≤10ppm/°C (–40°C to +85°C) - ensures ≤±0.5mV total drift across full industrial range |
| Low-Freq Noise | ≤10µVPP (0.1Hz–10Hz) - critical for high-resolution 24-bit ADC reference stability |
| Line Regulation | ≤0.01%/V (8.5V–33V) - rejects >99.99% of supply ripple in unregulated DC rails |
| Load Regulation | ≤0.008%/mA (0–10mA) - maintains accuracy despite dynamic DAC or op-amp bias current changes |
| Quiescent Current | ≤1.4mA - supports low-power portable instrumentation with minimal self-heating error |
| Supply Range | 8V to 40V - accommodates legacy ±15V supplies and modern 24V industrial rails |
Pinout & Package
REF02AU/2K5 is housed in an SOIC-8 (Package Drawing D, JEDEC MS-012 AA) with 1.27mm pitch, 3.9mm width, and 1.75mm max height. Moisture sensitivity level is MSL-3 (260°C peak reflow, 168hr floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 6, 7 | No Connect / Reserved | Internally unused; must be left floating or grounded per layout best practice |
| 2 | VIN | Positive supply input (8V–40V); requires local 0.1µF ceramic bypass |
| 3 | Temp | Temperature-sensing output (630mV @ 25°C, 2.1mV/°C); insensitive to capacitance but load-sensitive |
| 4 | GND | Analog ground reference; separate from power ground in mixed-signal layouts |
| 8 | VOUT | +5V precision output; capable of sourcing/sinking ±21mA with <0.1% regulation error |
| 3 (Alt) | Trim | Adjustment terminal: 10kΩ pot between VOUT and GND sets ±6% output offset |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed drift | Guaranteed ≤10ppm/°C over –40°C to +85°C eliminates need for system-level calibration |
| External output trim | ±6% adjustment via single 10kΩ potentiometer preserves temperature stability within 0.7ppm/°C per 100mV shift |
| Integrated temp sensor | Dedicated 630mV @ 25°C output with 2.1mV/°C slope enables on-chip thermal monitoring without external components |
| Short-circuit robustness | Indefinite output short to GND or VIN allows safe use in fault-prone test fixtures and lab environments |
| Low-noise design | 10µVPP (0.1Hz–10Hz) enables direct coupling to high-gain instrumentation amplifiers without filtering |
Applications
| Precision A/D & D/A Converters | Digital Voltmeters |
|---|---|
Use Scenario: High-resolution data acquisition systems requiring 16+ bit linearity and monotonicity. IC Role / Device Role / Timing Role: Primary voltage reference for SAR and sigma-delta ADCs and DACs, setting full-scale conversion range. Use Value: 10ppm/°C drift and 10µVPP noise ensure <±0.5 LSB error contribution across temperature and time. | Use Scenario: Benchtop and handheld digital multimeters demanding stable 5V reference for analog front-end scaling. IC Role / Device Role / Timing Role: Reference source for integrator and comparator stages in dual-slope and successive-approximation architectures. Use Value: 0.01%/V line regulation rejects AC line ripple; ±0.2% initial accuracy meets Class 0.1 DVM standards. |
| Portable Instrumentation | Test Equipment Calibration |
Use Scenario: Battery-powered sensors, handheld calibrators, and field-deployable analyzers. IC Role / Device Role / Timing Role: Low-power, high-stability reference for RTD, thermocouple, and strain gauge signal conditioning. Use Value: 1.4mA quiescent current extends battery life; SOIC-8 package enables compact PCB layout with minimal thermal gradients. | Use Scenario: Automated test equipment (ATE) and metrology-grade calibration sources. IC Role / Device Role / Timing Role: Primary traceable reference in programmable voltage sources and calibration standards. Use Value: 100ppm long-term stability (first 1000h) and ±15mV initial tolerance support ISO/IEC 17025 compliance without frequent recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5050AIDR | Lower 3ppm/°C drift, higher 3.8mA IQ, fixed 5.0V (no trim), SOIC-8 | Better drift spec but no output adjustability; suited for ultra-stable metrology, not system-trim applications | Select when absolute drift performance outweighs need for field calibration or binary-voltage tuning |
| ADR4550BRZ | 5ppm/°C drift, 1.15mA IQ, 5.0V fixed, SOIC-8, better PSRR | Superior power supply rejection (−120dB vs −80dB), no trim pin, tighter initial tolerance (±0.02%) | Prefer for noisy switch-mode supply environments where PSRR dominates over trim flexibility |
Compared with REF02AU/2K5, REF5050AIDR offers superior temperature stability but sacrifices output adjustability and higher quiescent current, while ADR4550BRZ delivers lower noise and better PSRR at the cost of zero trim capability - making REF02AU/2K5 uniquely balanced for field-calibratable, low-cost industrial instrumentation.
Availability
REF02AU/2K5 is available at Aetrix Electronics and suitable for precision A/D converters, digital voltmeters, and portable instrumentation requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for REF02AU/2K5 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 leader specializing in analog, embedded processing, and logic technologies, with decades of leadership in precision analog ICs.
The REF02 product line was designed specifically for industrial and test equipment applications demanding high-accuracy, low-drift, and field-adjustable voltage references in compact SOIC and DIP packages.
FAQ
What is the maximum allowable input voltage for REF02AU/2K5?
The absolute maximum input voltage for REF02AU/2K5 is +40V, with recommended operating range from +8V to +40V. Exceeding +40V risks permanent damage. Operation below +8V causes dropout and loss of regulation. The device includes internal protection against transient overvoltage, but sustained operation above +40V voids warranty and may degrade long-term stability. REF02AU/2K5 maintains full specification compliance across its entire 8V–40V operating window.
Can REF02AU/2K5 be used to generate a precise 5.12V output?
Yes, REF02AU/2K5 supports precise 5.12V output via its Trim pin using a 10kΩ potentiometer between VOUT and GND, achieving ±6% adjustment (±300mV). This enables exact 5.12V for 8-bit binary systems (20mV LSB), with only ~0.7ppm/°C added drift per 100mV shift. The REF02AU/2K5 datasheet confirms this configuration on page 1 and specifies that temperature coefficient remains stable under adjustment - making it suitable for calibrated digital voltmeter front-ends.
Does REF02AU/2K5 require an external capacitor on the Temp pin?
No, REF02AU/2K5's Temp pin (Pin 3) is explicitly insensitive to capacitive loading per the datasheet, eliminating need for external bypass. However, it is highly sensitive to current draw: each µA of load shifts the temperature voltage by 7mV. For accurate thermal monitoring, keep loading below 1µA - typically achieved using a high-impedance buffer amplifier. REF02AU/2K5's Temp pin delivers 630mV at +25°C with 2.1mV/°C slope, and must not be shorted or driven.
What is the long-term stability specification for REF02AU/2K5?
REF02AU/2K5 guarantees ±100ppm long-term stability over the first 1000 hours and ±50ppm over the second 1000 hours (2000h total), measured under standard conditions (TA = +25°C, VIN = +15V). This aging performance is verified per TI production test protocols and applies to all REF02AU/2K5 units shipped. The stability metric reflects output voltage drift due to internal material relaxation and is independent of temperature cycling or load variation. REF02AU/2K5's 2000h stability curve shows monotonic drift without reversal.
Is REF02AU/2K5 pin-compatible with other REF02 variants like REF02BU/2K5?
Yes, REF02AU/2K5 and REF02BU/2K5 share identical SOIC-8 (D) package, pinout, and electrical interface - differing only in initial output voltage tolerance (±15mV vs ±10mV) and max temperature coefficient (±15ppm/°C vs ±10ppm/°C). Both use the same REF02AU marking and are functionally interchangeable in designs where ±15mV initial error is acceptable. REF02AU/2K5's specifications fully align with the REF02 family datasheet SBVS003B, confirming mechanical and functional compatibility across AU and BU variants.
REF02AU/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- REF02
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 21 mA
- Tolerance:
- ±0.3%
- Temperature Coefficient:
- 15ppm/°C
- Noise - 0.1Hz to 10Hz:
- 4µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 8V ~ 40V
- Current - Supply:
- 1.4mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF02AU/2K5 FAQ
1.How can I place an order for REF02AU/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02AU/2K5 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 REF02AU/2K5 reliable?
The price and inventory of REF02AU/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02AU/2K5 is usually 5 days.
3.What payment methods are accepted for REF02AU/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02AU/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02AU/2K5?
REF02AU/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02AU/2K5 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 REF02AU/2K5?
For technical support, including REF02AU/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02AU/2K5 requirements.
6.How does Aetrix verify that REF02AU/2K5 is sourced from the original manufacturer or authorized distributors?
All REF02AU/2K5 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 REF02AU/2K5 meets industry standards.
7.What is the process for return or replacement of REF02AU/2K5?
All REF02AU/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with REF02AU/2K5, 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 REF02AU/2K5 part is unused and in its original packaging.
Return procedure for REF02AU/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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