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Texas Instruments REF02AU
- Part No.:
- REF02AU
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF02AU.pdf
- Description:
- IC VREF SERIES 0.3% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:142
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Product details
Overview
REF02AU 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), designed for high-stability analog signal chains in A/D converters, digital voltmeters, and calibration standards.
For engineers reviewing the REF02AU datasheet, REF02AU pinout, REF02AU application, or REF02AU equivalent, this page delivers verified specifications, SO-8 package details, trim-adjustable output behavior, industrial-grade thermal performance, and direct alternative comparisons - all grounded in TI's SBVS003B production data sheet.
Technical Context
The REF02AU implements a laser-trimmed bandgap core with external trim capability via Pin 6, enabling ±6% output adjustment (±300mV) while maintaining <0.7ppm/°C/100mV degradation in temperature coefficient. Its architecture supports single-supply operation from 8V to 40V with internal short-circuit protection and no need for external pass components.
It features a dedicated temperature-sensing output on Pin 3 (630mV at +25°C, 2.1mV/°C), decoupled from VOUT loading effects, and achieves 0.008%/mA load regulation and 0.01%/V line regulation across its full operating range - critical for metrology-grade reference stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +5.000V ±15mV at +25°C - enables binary-aligned 5.12V trimming for 8-bit systems without recalibration. |
| Temp Drift | ≤10ppm/°C (–40°C to +85°C) - ensures ≤±0.5mV total drift across industrial temperature range. |
| Noise (0.1–10Hz) | ≤10µVPP - preserves SNR in high-resolution ADCs and precision DACs. |
| Line Regulation | ≤0.01%/V (8V–33V) - minimizes supply ripple coupling into reference output. |
| Load Regulation | ≤0.008%/mA (0–10mA) - maintains accuracy under dynamic load conditions in active reference buffers. |
| Quiescent Current | ≤1.4mA - supports low-power portable instrumentation without sacrificing stability. |
| Supply Range | 8V to 40V - accommodates unregulated rails and wide-input industrial power supplies. |
Pinout & Package
REF02AU is packaged in an 8-pin SOIC (SO-8, package drawing D, MSL Level-3, 260°C peak reflow), with 1.27mm pitch, 3.9mm body width, and 1.75mm max height per JEDEC MS-012 AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | Internally unused; must be left floating or tied to GND per layout best practice. |
| 2 | VIN | Input supply pin; accepts 8V–40V DC; requires local 0.1µF ceramic bypass capacitor. |
| 3 | Temp | Temperature-sensing output (630mV @ +25°C, 2.1mV/°C); insensitive to capacitive loading. |
| 4 | GND | Analog ground reference; must be connected to low-impedance system ground plane. |
| 5 | No Connect | Internally unused; must be left floating or tied to GND. |
| 6 | Trim | Adjustment terminal; connects to wiper of 10kΩ potentiometer between VOUT and GND for ±6% output tuning. |
| 7 | VOUT | Stable +5V reference output; capable of sourcing up to 21mA or sinking 0.5mA. |
| 8 | No Connect | Internally unused; must be left floating or tied to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed drift | 10ppm/°C max over –40°C to +85°C - eliminates need for external temperature compensation circuitry. |
| External output trim | ±6% adjustable range with <0.7ppm/°C/100mV TC shift - enables system-level calibration without degrading long-term stability. |
| Low-noise architecture | 10µVPP (0.1Hz–10Hz) - directly supports 16-bit+ ADCs without additional filtering. |
| Short-circuit protection | Indefinite output short to GND or VIN - prevents damage during test or fault conditions without external current limiting. |
| Wide supply tolerance | Operates from 8V to 40V - compatible with legacy industrial rails and unregulated transformer-based supplies. |
Applications
| Precision A/D Conversion | Digital Voltmeter (DVM) |
|---|---|
Use Scenario: High-resolution 16-bit successive-approximation ADC in automated test equipment requiring stable full-scale reference. IC Role / Device Role / Timing Role: Primary voltage reference defining LSB step size and conversion linearity. Use Value: 10ppm/°C drift and 10µVPP noise ensure <±0.5LSB error contribution over temperature and time. | Use Scenario: 5½-digit handheld DVM where reference stability determines absolute measurement accuracy. IC Role / Device Role / Timing Role: Calibration-grade reference source for autoranging and zero-offset correction. Use Value: ±0.2% initial accuracy and 150ppm long-term stability (2000h) support NIST-traceable field calibration. |
| Portable Instrumentation | Constant Current Source |
Use Scenario: Battery-powered pH meter with integrated sensor signal conditioning and display. IC Role / Device Role / Timing Role: Low-quiescent-current (1.4mA max) reference powering op-amp gain stages and ADC front-end. Use Value: Enables >100-hour battery life while maintaining ±0.01% reading repeatability across ambient temperature swings. | Use Scenario: Precision LED driver or RTD excitation circuit requiring stable current setpoint. IC Role / Device Role / Timing Role: Reference input to op-amp current mirror or Howland source configuration. Use Value: 0.008%/mA load regulation ensures <10ppm current error variation when driving variable sensor loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF02BU | ±10mV (±0.2%) initial accuracy vs. REF02AU's ±15mV (±0.3%) - tighter VOUT tolerance at +25°C. | Preferred for metrology-grade calibrators where initial accuracy dominates long-term drift budget. | Select REF02BU when initial tolerance is prioritized over cost; identical pinout, temp range, and trim capability. |
| ADR445BRZ | 2.5ppm/°C max drift, 1.8µVPP noise, but fixed +5.000V output - no trim capability and higher quiescent current (1.5mA). | Better suited for ultra-low-drift lab instruments; not suitable for systems requiring output adjustment or wide supply range. | Choose ADR445BRZ only if sub-3ppm/°C drift is mandatory and external trim is unnecessary; SO-8 compatible but not pin-to-pin. |
Compared with REF02AU, REF02BU offers tighter initial accuracy without trade-offs in drift or noise, making it ideal for calibration-critical roles; ADR445BRZ delivers superior drift and noise but sacrifices adjustability and supply flexibility - neither is pin-compatible, but both serve overlapping high-precision reference functions.
Availability
REF02AU is available at Aetrix Electronics and suitable for precision A/D conversion, digital voltmeter design, and portable instrumentation requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for REF02AU 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 connectivity technologies, with decades of heritage in precision analog design.
The REF02 product line was engineered specifically for industrial and instrumentation applications demanding high-accuracy, low-drift, and robust single-supply voltage references - emphasizing long-term stability, thermal resilience, and ease of system integration.
FAQ
What is the maximum allowable input voltage for REF02AU?
The absolute maximum input voltage for REF02AU is +40V DC. Operation within the recommended 8V to 40V range ensures specified performance including line regulation ≤0.01%/V and thermal stability. Exceeding +40V risks permanent damage, as confirmed in TI's SBVS003B Absolute Maximum Ratings table. REF02AU includes internal protection but is not rated for transient overvoltage beyond this limit.
Can REF02AU be used to generate a precise 5.12V reference for 8-bit systems?
Yes, REF02AU supports precise 5.12V output via its Trim pin (Pin 6). Using a 10kΩ potentiometer between VOUT and GND with the wiper connected to Trim enables ±6% adjustment - covering 5.12V (a +2.4% offset). The datasheet confirms this use case explicitly, noting "5.12V for binary applications" and quantifying TC degradation as ~0.7ppm/°C per 100mV of adjustment.
Does REF02AU require an external capacitor on the Temp pin (Pin 3)?
No, REF02AU's Temp pin (Pin 3) is explicitly stated to be "insensitive to capacitive loading" in the SBVS003B datasheet. It provides a ratiometric temperature voltage (630mV at +25°C, 2.1mV/°C) for monitoring or compensation, and adding capacitance does not improve stability or accuracy - unlike VOUT, which benefits from a 0.1µF ceramic capacitor.
What is the long-term stability specification for REF02AU over 2000 hours?
REF02AU exhibits ±100ppm drift in the first 1000 hours and ±50ppm in the second 1000 hours under standard test conditions (TA = +25°C, VIN = +15V), totaling ±150ppm maximum change over 2000 hours. This value is measured and published in the Electrical Specifications table of SBVS003B and applies to all REF02A-grade devices including REF02AU.
Is REF02AU pin-compatible with REF02AP (DIP-8 version)?
No, REF02AU (SO-8) and REF02AP (DIP-8) share identical electrical functionality and pin assignments (e.g., Pin 2 = VIN, Pin 7 = VOUT), but they are not mechanically pin-compatible due to differing package footprints, lead pitches, and mounting requirements. Layout redesign is required when substituting between SOIC and PDIP packages - though schematic symbol and net connections remain identical.
REF02AU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- REF02
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for REF02AU through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02AU 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 reliable?
The price and inventory of REF02AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02AU is usually 5 days.
3.What payment methods are accepted for REF02AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02AU?
REF02AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02AU 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?
For technical support, including REF02AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02AU requirements.
6.How does Aetrix verify that REF02AU is sourced from the original manufacturer or authorized distributors?
All REF02AU 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 meets industry standards.
7.What is the process for return or replacement of REF02AU?
All REF02AU units undergo pre-shipment inspection (PSI). If there is an issue with REF02AU, 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 part is unused and in its original packaging.
Return procedure for REF02AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF02AU Tags
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