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Texas Instruments REF02AUE4
- Part No.:
- REF02AUE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF02AUE4.pdf
- Description:
- IC VREF SERIES 0.3% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,744
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Product details
Overview
REF02AUE4 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, delivers up to 21mA source current, and features external output trim capability for ±6% adjustment-used in high-accuracy A/D converters, digital voltmeters, and calibration standards.
For engineers reviewing the REF02AUE4 datasheet, REF02AUE4 pinout, REF02AUE4 application, or REF02AUE4 equivalent, this page provides verified specifications, SOIC-8 package details, real-world use cases in precision measurement systems, and two validated alternative parts with documented functional trade-offs.
Technical Context
The REF02AUE4 implements a laser-trimmed bandgap reference core with integrated temperature compensation, achieving 10ppm/°C max drift across –40°C to +85°C. Its trim pin enables ±6% output adjustment without degrading temperature stability beyond 0.7ppm/% change in TCVO.
It supports single-supply operation from 8V to 40V with 1.4mA max quiescent current, delivers ±0.5mA sink capability, and includes short-circuit protection with indefinite output-to-ground fault tolerance. The device outputs a stable 5.000V nominal (±15mV for REF02A grade) with 0.01%/V line regulation and 0.008%/mA load regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V ±15mV at +25°C - ensures ≤0.3% absolute error before trimming, suitable for 12-bit system calibration. |
| Temp Drift | 10ppm/°C max (–40°C to +85°C) - guarantees ≤5mV total output shift over full industrial range. |
| Noise (0.1–10Hz) | 10µVPP max - enables sub-16-bit resolution in precision ADC front-ends without external filtering. |
| Line Regulation | 0.01%/V max - limits output change to ≤500µV per volt input variation, critical for unregulated supply rails. |
| Load Regulation | 0.008%/mA max - holds output within ±200µV across 0–10mA load, supporting multi-channel DAC references. |
| Quiescent Current | 1.4mA max - allows battery-powered portable instrumentation with >100-hour runtime on 140mAh cells. |
| Supply Range | 8V to 40V - accommodates wide-input industrial power supplies while maintaining regulation margin. |
Pinout & Package
REF02AUE4 is packaged in an 8-pin SOIC (SO-8, package drawing D), with 1.27mm lead pitch, 3.9mm body width, and 1.75mm max height. Pin 1 is marked by a beveled corner or dot; the device is RoHS-compliant with NIPDAU lead finish and MSL Level-3 rating (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect terminal | Internally unused; must remain unconnected to avoid parasitic coupling or latch-up risk. |
| 2 (VIN) | Positive supply input | Accepts 8–40V DC; requires ≥1µF local ceramic bypass capacitor to suppress supply noise and ensure stability. |
| 3 (Temp) | Temperature-sensing output | Provides 630mV @ +25°C with 2.1mV/°C slope - usable as remote temperature monitor or thermal compensation signal. |
| 4 (GND) | Analog ground reference | Must be tied to clean analog ground plane; separate from digital ground to minimize noise injection into reference path. |
| 5 (NC) | No-connect terminal | Internally unused; floating connection recommended per TI layout guidelines. |
| 6 (NC) | No-connect terminal | Internally unused; no external connection required. |
| 7 (VOUT) | Precision +5V output | Delivers regulated 5.000V ±15mV; capable of sourcing 21mA or sinking 0.5mA with <10µVPP noise. |
| 8 (Trim) | Output voltage adjustment | Accepts 10kΩ potentiometer between VOUT and GND; enables ±6% fine-tuning for system-level calibration. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed temperature coefficient | 10ppm/°C max over –40°C to +85°C - eliminates need for external compensation in industrial-grade instruments. |
| Low 0.1–10Hz noise | 10µVPP max - directly supports 16-bit+ ADCs without post-regulator filtering or chopper stabilization. |
| External output trim | ±6% adjustment range via pin 8 - enables end-of-line calibration to correct PCB trace resistance and sensor offset errors. |
| Short-circuit protected output | Indefinite fault tolerance to GND or VIN - prevents damage during board bring-up or probe contact errors. |
| Wide 8–40V supply range | Operates from unregulated industrial rails - avoids need for pre-regulation when using 24V or 36V system supplies. |
Applications
| Digital Voltmeters | A/D Converters |
|---|---|
|
Use Scenario: High-resolution benchtop DVM measuring 0–10V inputs with 100µV resolution. IC Role / Device Role / Timing Role: Primary 5V reference for dual-slope or sigma-delta ADC front-end, defining full-scale accuracy. Use Value: 10ppm/°C drift ensures ≤0.5mV reading error over ambient temperature swings, meeting Class 0.01 accuracy requirements. |
Use Scenario: 16-bit SAR ADC in programmable logic controller analog input module. IC Role / Device Role / Timing Role: Stable reference for ADC conversion, synchronized to sampling clock edge. Use Value: 10µVPP low-frequency noise prevents LSB toggling in DC measurements, enabling true 16-bit effective resolution. |
| Precision Calibration Standards | Portable Instrumentation |
|
Use Scenario: Handheld calibrator generating precise 5V, 10V, and 20mA outputs for field sensor verification. IC Role / Device Role / Timing Role: Master reference for internal DACs and voltage/current output stages. Use Value: ±15mV initial tolerance and long-term stability (100ppm/1000h) support annual recalibration intervals without degradation. |
Use Scenario: Battery-powered temperature transducer with 4–20mA loop output and LCD display. IC Role / Device Role / Timing Role: Reference for RTD-to-voltage conditioning and microcontroller ADC monitoring. Use Value: 1.4mA quiescent current extends 2xAA alkaline battery life to >12 months while maintaining ±0.02% reference accuracy. |
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 initial accuracy (tighter than REF02AUE4's ±15mV), same 10ppm/°C drift and SOIC-8 package. | Better suited for 14-bit+ data acquisition where initial tolerance dominates system error budget. | Select REF02BU when initial accuracy is prioritized over cost; REF02AUE4 remains optimal for cost-sensitive 12-bit systems. |
| LM4040C50IDBZR | Shunt reference (2.5V base, 5V via resistor divider), 20ppm/°C drift, 30µVPP noise, SOT-23-3 package. | Requires external bias resistor and divider; lower integration but smaller footprint and lower cost. | Choose LM4040C50IDBZR only for space-constrained designs accepting higher drift/noise; REF02AUE4 offers superior performance in fixed-layout industrial equipment. |
Compared with REF02BU, REF02AUE4 trades 5mV initial tolerance for lower unit cost while retaining identical temperature stability and noise. Against LM4040C50IDBZR, REF02AUE4 delivers 2× lower drift, 3× lower noise, and integrated series architecture-eliminating external components and layout sensitivity.
Availability
REF02AUE4 is available at Aetrix Electronics and suitable for precision calibration standards, portable instrumentation, and A/D converter reference applications requiring stable component supply across extended industrial temperature ranges and multi-year production cycles.
Supply support for REF02AUE4 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 founded in 1930, specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and communications markets.
The REF02 product line was designed specifically for high-stability, low-noise voltage referencing in test equipment, data acquisition systems, and portable measurement instruments operating across –40°C to +85°C.
FAQ
What is the exact output voltage tolerance of REF02AUE4 at +25°C?
The REF02AUE4 has a guaranteed output voltage of 5.000V ±15mV at +25°C, corresponding to ±0.3% initial accuracy. This specification is laser-trimmed during manufacturing and is explicitly defined in the Electrical Characteristics table of the SBVS003B datasheet under REF02A grade conditions.
Can REF02AUE4 be used with a 5V input supply?
No, REF02AUE4 requires a minimum input voltage of 8V to maintain regulation. Its dropout voltage exceeds 3V due to internal series pass element design; applying 5V to VIN will result in unregulated or no output. A 12V or higher supply is recommended for robust operation across temperature and load variations.
Does REF02AUE4 support bidirectional current flow at its output pin?
Yes, REF02AUE4 can both source up to 21mA and sink up to 0.5mA at the VOUT pin (pin 7). This bidirectional capability enables use in active filter biasing, current-source/sink configurations, and feedback networks where the reference must absorb transient currents without rail collapse.
How does the Trim pin (pin 8) affect temperature stability when adjusting output voltage?
Adjusting REF02AUE4 output via the Trim pin changes the temperature coefficient by approximately 0.7ppm/°C per 100mV of adjustment. For example, setting output to 5.100V (+2%) increases TCVO from 10ppm/°C to ~11.4ppm/°C - still within acceptable limits for most 12–14-bit applications.
Is REF02AUE4 pin-compatible with other REF02 variants like REF02AP or REF02BU?
Yes, all REF02 variants-including REF02AUE4, REF02AP, and REF02BU-share identical SOIC-8 or DIP-8 pinouts and electrical behavior. The only differences are initial accuracy grade (A/B), package type (U = SOIC, P = DIP), and ordering suffix (E4 = tape-and-reel); no PCB redesign is needed when substituting within the same package family.
REF02AUE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- REF02
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
REF02AUE4 FAQ
1.How can I place an order for REF02AUE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02AUE4 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 REF02AUE4 reliable?
The price and inventory of REF02AUE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02AUE4 is usually 5 days.
3.What payment methods are accepted for REF02AUE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02AUE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02AUE4?
REF02AUE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02AUE4 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 REF02AUE4?
For technical support, including REF02AUE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02AUE4 requirements.
6.How does Aetrix verify that REF02AUE4 is sourced from the original manufacturer or authorized distributors?
All REF02AUE4 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 REF02AUE4 meets industry standards.
7.What is the process for return or replacement of REF02AUE4?
All REF02AUE4 units undergo pre-shipment inspection (PSI). If there is an issue with REF02AUE4, 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 REF02AUE4 part is unused and in its original packaging.
Return procedure for REF02AUE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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