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Texas Instruments REF02BUE4
- Part No.:
- REF02BUE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF02BUE4.pdf
- Description:
- IC VREF SERIES 0.2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,204
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Product details
Overview
REF02BUE4 from Texas Instruments is a precision +5V voltage reference IC with ±10mV (±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 trim-adjustable output (±6%) for system calibration in high-accuracy data converters and test equipment.
For engineers reviewing the REF02BUE4 datasheet, REF02BUE4 pinout, REF02BUE4 application, or REF02BUE4 equivalent, this device is selected for precision analog signal chains requiring stable 5V reference voltage under industrial temperature conditions, low-noise operation, and external trimming capability without compromising thermal stability.
Technical Context
The REF02BUE4 uses a laser-trimmed bandgap core with internal temperature compensation to achieve 10ppm/°C max drift across –40°C to +85°C. Its trim pin enables ±6% output adjustment via external potentiometer while adding only 0.7ppm/°C per 1% adjustment to temperature coefficient.
It integrates short-circuit protection, operates with 1.4mA max quiescent current, and maintains 0.008%/mA load regulation and 0.01%/V line regulation - critical for A/D and D/A converter reference rails where supply and load variations must not perturb reference integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V ±10mV at +25°C - ensures ≤0.2% absolute error before trimming, enabling direct use in 12-bit+ systems without calibration. |
| Temp Drift | ≤10ppm/°C (–40°C to +85°C) - guarantees ≤±0.5mV total drift over full industrial range, supporting stable metrology-grade references. |
| Low-Freq Noise | ≤10µVPP (0.1Hz–10Hz) - minimizes quantization uncertainty in high-resolution ADCs and digital voltmeters. |
| Line Regulation | ≤0.01%/V (8V–33V) - rejects input supply ripple, preserving reference accuracy even with unregulated or noisy DC supplies. |
| Load Regulation | ≤0.008%/mA (0–10mA) - maintains voltage stability across varying DAC or sensor bias loads without external buffering. |
| Quiescent Current | ≤1.4mA - enables low-power portable instrumentation and battery-backed calibration standards. |
| Supply Range | 8V to 40V - supports wide-input industrial power rails and eliminates need for pre-regulation in many applications. |
Pinout & Package
REF02BUE4 is housed in an SOIC-8 (D) package with 1.27mm lead pitch, 3.9mm body width, and 1.75mm max height - compatible with standard surface-mount assembly and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unused; must be left floating or tied to GND per layout best practice - no electrical function. |
| 2 (VIN) | Positive Supply Input | Accepts 8V–40V unregulated DC; internal current limiting protects against overvoltage transients. |
| 3 (Temp) | Temperature Monitor Output | Provides 630mV ±7mV at +25°C, linear 2.1mV/°C slope - usable for on-chip temperature sensing or thermal compensation circuits. |
| 4 (GND) | Analog Ground Reference | Primary return path for reference output and internal circuitry; requires low-impedance connection to system AGND plane. |
| 5 (NC) | No Connect | Internally unused; must be left floating - no thermal or electrical role. |
| 6 (NC) | No Connect | Internally unused; must be left floating - no thermal or electrical role. |
| 7 (VOUT) | Precision +5V Output | Stable, low-noise 5V reference; capable of sourcing up to 21mA - directly drives ADC reference inputs or op-amp gain stages. |
| 8 (Trim) | Output Adjustment Terminal | Accepts external 10kΩ potentiometer between VOUT and GND to adjust output ±6% with <0.7ppm/°C/1% added drift. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed temperature coefficient | 10ppm/°C max over –40°C to +85°C - eliminates need for external thermal compensation in industrial-grade instruments. |
| Trim-adjustable output | ±6% range via single external potentiometer - enables end-system calibration to correct for board-level errors without redesign. |
| Low 0.1Hz–10Hz noise | 10µVPP max - preserves effective resolution in 16-bit+ ADCs and precision digital multimeters. |
| Short-circuit protected output | Indefinite short-to-ground or VIN tolerance - prevents latch-up or damage during test fixture misconnection or board debug. |
| Wide 8V–40V supply range | Operates directly from unregulated industrial rails - avoids extra LDO or switching regulator stage in power-constrained designs. |
Applications
| Precision A/D and D/A Converters | Digital Voltmeters |
|---|---|
Use Scenario: High-resolution data acquisition system digitizing sensor outputs with 16-bit SAR or delta-sigma ADCs. IC Role / Device Role / Timing Role: Provides stable, low-noise 5V reference voltage for ADC reference input and DAC output buffer biasing. Use Value: Enables ≤0.5LSB integral nonlinearity error over temperature by maintaining <±0.5mV total drift and <10µVPP noise floor. | Use Scenario: Portable handheld digital multimeter measuring DC voltage with 0.01% basic accuracy. IC Role / Device Role / Timing Role: Serves as primary calibration reference for autoranging front-end and ADC scaling. Use Value: Delivers ±0.2% initial accuracy and <10ppm/°C drift - meets IEC 61010 Class II accuracy requirements without periodic recalibration. |
| Precision Calibration Standards | Constant Current Source/Sink |
Use Scenario: Benchtop calibration source generating traceable 5V output for field instrument verification. IC Role / Device Role / Timing Role: Acts as the primary voltage standard, trimmed to exact 5.000V using external potentiometer on Trim pin. Use Value: Achieves ±10mV absolute accuracy after trimming, with long-term stability of ≤100ppm over first 1000h - suitable for ISO/IEC 17025 accredited labs. | Use Scenario: Precision LED driver or sensor excitation circuit requiring stable current independent of supply variation. IC Role / Device Role / Timing Role: Supplies reference voltage to op-amp current mirror or Howland source configuration. Use Value: Maintains ≤0.008%/mA load regulation and ≤0.01%/V line regulation - ensures current accuracy remains within ±0.01% across 5–20V supply and 0–10mA load changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5050IDR | 5.000V ±0.05% initial accuracy, 3ppm/°C drift, 5.6µVPP noise, SO-8 package | Higher accuracy and lower drift/noise; requires 3.3V–18V supply - unsuitable for 8V–40V direct-input systems | Select when ultimate stability and noise performance justify tighter supply constraints and higher cost. |
| ADR4550BRZ | 5.000V ±0.02% initial accuracy, 2ppm/°C drift, 1.2µVPP noise, SO-8 package | Superior specs across all parameters but limited 3.3V–15V supply range and no trim pin - lacks field calibration capability | Choose for metrology-grade applications where external trimming is unnecessary and supply is regulated. |
Compared with REF02BUE4, REF5050IDR offers better drift and noise but cannot operate below 3.3V supply, while ADR4550BRZ provides highest precision but removes the critical trim functionality needed for system-level calibration - making REF02BUE4 uniquely suited for industrial field instruments requiring both rugged supply tolerance and post-assembly adjustment.
Availability
REF02BUE4 is available at Aetrix Electronics and suitable for precision data converters, portable test equipment, industrial calibration standards, and sensor excitation circuits requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for REF02BUE4 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and silicon technology for industrial, automotive, and communications markets.
The REF02 family was designed as a robust, wide-supply, trimmable precision voltage reference for industrial instrumentation, data acquisition, and calibration systems where reliability across –40°C to +85°C and field-adjustability are essential.
FAQ
What is the initial output voltage tolerance of the REF02BUE4 at +25°C?
The REF02BUE4 has an initial output voltage tolerance of ±10mV (±0.2%) at +25°C, specified as 4.990V to 5.010V. This tight tolerance enables direct use in 12-bit analog systems without factory calibration. The REF02BUE4 achieves this via laser trimming during production, and its output can be further adjusted using the Trim pin to compensate for system-level errors.
Can the REF02BUE4 operate from a 12V supply in a battery-powered application?
Yes, the REF02BUE4 operates from 8V to 40V, so a nominal 12V battery supply is fully supported. Its quiescent current is ≤1.4mA, enabling >1-year operation from a 20Ah lead-acid or LiFePO₄ battery. The REF02BUE4 also maintains 0.01%/V line regulation across this range, ensuring stable 5V output despite battery voltage sag from 12.8V to 10.5V.
Does the REF02BUE4 include a temperature sensor output, and how is it used?
Yes, Pin 3 (Temp) provides a linear temperature-proportional voltage: 630mV at +25°C with 2.1mV/°C slope over –55°C to +125°C. This output is insensitive to capacitive loading and can be used for on-board thermal monitoring or feed-forward compensation. The REF02BUE4 datasheet specifies that each µA of loading modifies the output by 7mV, so high-impedance buffering is recommended for accurate readings.
Is the REF02BUE4 pin-compatible with other members of the REF02 family, such as REF02AU or REF02AP?
Yes, the REF02BUE4 shares identical SOIC-8 (D) pinout and electrical behavior with all REF02xU variants (e.g., REF02AU, REF02CU), differing only in initial voltage tolerance and temperature drift specifications. REF02BUE4 (±10mV, 10ppm/°C) and REF02AU (±15mV, 15ppm/°C) are mechanically and functionally interchangeable in PCB layouts - no redesign is required when upgrading to tighter specs.
What is the maximum load current the REF02BUE4 can source while maintaining specification?
The REF02BUE4 can source up to 21mA while maintaining output voltage accuracy within datasheet limits. At 10mA load, load regulation is ≤0.008%/mA - meaning ≤±0.08mV deviation. The device includes short-circuit protection and thermal shutdown, allowing indefinite output shorting to ground or VIN without damage. This makes the REF02BUE4 suitable for driving multiple op-amps or ADC reference inputs simultaneously.
REF02BUE4 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:
- ±0.2%
- Temperature Coefficient:
- 10ppm/°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
REF02BUE4 FAQ
1.How can I place an order for REF02BUE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02BUE4 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 REF02BUE4 reliable?
The price and inventory of REF02BUE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02BUE4 is usually 5 days.
3.What payment methods are accepted for REF02BUE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02BUE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02BUE4?
REF02BUE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02BUE4 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 REF02BUE4?
For technical support, including REF02BUE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02BUE4 requirements.
6.How does Aetrix verify that REF02BUE4 is sourced from the original manufacturer or authorized distributors?
All REF02BUE4 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 REF02BUE4 meets industry standards.
7.What is the process for return or replacement of REF02BUE4?
All REF02BUE4 units undergo pre-shipment inspection (PSI). If there is an issue with REF02BUE4, 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 REF02BUE4 part is unused and in its original packaging.
Return procedure for REF02BUE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF02BUE4 Tags
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