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Texas Instruments REF02BU/2K5G4
- Part No.:
- REF02BU/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF02BU/2K5G4.pdf
- Description:
- IC VREF SERIES 0.2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,768
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Product details
Overview
REF02BU/2K5G4 from Texas Instruments is a precision +5V voltage reference IC with ±10mV initial accuracy (±0.2%), 10ppm/°C max temperature drift over –40°C to +85°C, 10µVPP low-frequency noise (0.1Hz–10Hz), and operates from 8V to 40V supply. It delivers stable 5V output for high-accuracy A/D and D/A converters, digital voltmeters, and calibration standards.
For engineers reviewing the REF02BU/2K5G4 datasheet, REF02BU/2K5G4 pinout, REF02BU/2K5G4 application, or REF02BU/2K5G4 equivalent, key selection factors include its SOIC-8 package, trimmable ±6% output adjustment, industrial temperature range, and guaranteed line/load regulation performance under real-world supply and load variations.
Technical Context
The REF02BU/2K5G4 employs a laser-trimmed bandgap core with external trim capability via Pin 6 (Trim), enabling precise system-level calibration without degrading temperature stability. Its internal architecture integrates short-circuit protection and thermal shutdown, supporting indefinite output shorting to ground or VIN.
It features a dedicated Temperature (Temp) pin (Pin 3) providing a linear 630mV output at +25°C with 2.1mV/°C coefficient - usable for on-chip temperature monitoring or compensation circuits. The device draws only 1.4mA max quiescent current and sustains up to 21mA source/sink load current within specified regulation limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +5.000V ±10mV (±0.2%) at 25°C - ensures direct compatibility with 5V logic and ADC reference rails without recalibration. |
| Temp Drift | ≤10ppm/°C (–40°C to +85°C) - guarantees ≤±0.5mV total drift across full industrial range, critical for metrology-grade systems. |
| Noise (0.1–10Hz) | ≤10µVPP - minimizes quantization uncertainty in 16-bit+ data acquisition systems. |
| Line Regulation | ≤0.01%/V (8V–33V) - maintains output stability despite unregulated supply ripple or variation in battery-powered instruments. |
| Load Regulation | ≤0.008%/mA (0–10mA) - supports dynamic loads like multiplexed sensor front-ends without reference droop. |
| Supply Range | 8V to 40V - enables use with standard industrial power rails and eliminates need for pre-regulation in 24V systems. |
| Quiescent Current | ≤1.4mA - allows integration into low-power portable test equipment with minimal battery drain. |
Pinout & Package
REF02BU/2K5G4 is housed in an SOIC-8 (D) package per JEDEC MS-012AA, 1.75mm max height, with standard 1.27mm pitch and Q1 pin-1 orientation in tape-and-reel packaging.
| 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 | Main input supply connection; accepts 8V–40V DC; requires local 0.1µF 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 clean system ground plane with low-impedance path. |
| 5 | No Connect | Internally unused; must be left floating or tied to GND. |
| 6 | Trim | Adjustment terminal; ±6% output tuning via 10kΩ potentiometer between VOUT and GND; minimal TCVO impact. |
| 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 output | Guarantees ±10mV (±0.2%) initial accuracy - eliminates need for post-assembly trimming in production test. |
| External output adjustment | ±6% tuning range via single 10kΩ potentiometer - enables system-level calibration for offset/gain error correction. |
| Integrated temp sensor | Dedicated Temp pin outputs linear 630mV @ 25°C with 2.1mV/°C slope - provides on-chip temperature monitoring without external sensors. |
| Short-circuit protection | Indefinite output shorting to GND or VIN - enhances reliability in field-deployed instrumentation with accidental wiring faults. |
| Low-noise design | 10µVPP (0.1Hz–10Hz) - meets noise floor requirements for 18-bit+ SAR and sigma-delta ADCs. |
Applications
| Digital Voltmeters | A/D and D/A Converters |
|---|---|
Use Scenario: High-resolution benchtop and handheld DVMs requiring stable 5V reference for accurate digitization of analog inputs. IC Role / Device Role / Timing Role: Primary voltage reference for dual-slope or sigma-delta ADC front-end; sets absolute measurement scale. Use Value: ±0.2% initial accuracy and 10ppm/°C drift ensure <±0.005% reading error over temperature - meeting Class 0.01 DVM specifications. | Use Scenario: Precision data acquisition systems using 16-bit+ ADCs and DACs in industrial control and test equipment. IC Role / Device Role / Timing Role: Reference source for ADC full-scale and DAC output scaling; referenced by both conversion paths. Use Value: 10µVPP low-frequency noise prevents LSB toggling in 18-bit conversions; load regulation ensures consistent reference under dynamic channel switching. |
| Precision Calibration Standards | Constant Current Source/Sink |
Use Scenario: Portable calibration tools used to verify multimeters, transmitters, and process calibrators in field service. IC Role / Device Role / Timing Role: Traceable 5V reference node; often trimmed to exact 5.000V for NIST-traceable calibration points. Use Value: Laser-trimmed ±10mV tolerance and long-term stability (100ppm/1000h) support annual recalibration intervals without drift-induced failures. | Use Scenario: LED driver and sensor excitation circuits requiring stable current independent of supply or load variation. IC Role / Device Role / Timing Role: Voltage reference for op-amp-based current mirror or Howland source configurations. Use Value: 0.008%/mA load regulation ensures <±80ppm current error across 10mA load range - critical for photodiode and RTD biasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF02AU/2K5 | ±15mV (±0.3%) initial accuracy; 15ppm/°C max drift - looser tolerance than REF02BU/2K5G4. | Suitable for cost-sensitive applications where ±0.3% accuracy suffices, e.g., non-critical sensor signal chains. | Select REF02AU/2K5 only if system-level calibration can absorb higher initial error and drift budget. |
| ADR441BRZ | ±0.12% initial accuracy; 3ppm/°C max drift; 1.8µVPP noise; requires 4.5V–18V supply - superior specs but narrower input range. | Better suited for ultra-low-noise, low-voltage embedded systems (e.g., battery-powered DAQ) where 8V minimum supply is unavailable. | Choose ADR441BRZ when sub-3ppm/°C drift and µV-level noise are mandatory, and supply voltage is constrained below 8V. |
Compared with REF02BU/2K5G4, REF02AU/2K5 trades accuracy and stability for lower cost in less demanding applications, while ADR441BRZ offers higher precision and lower noise at the expense of reduced supply voltage flexibility and higher unit price.
Availability
REF02BU/2K5G4 is available at Aetrix Electronics and suitable for precision calibration standards, A/D and D/A converters, and digital voltmeters requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for REF02BU/2K5G4 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 over 90 years of innovation in precision analog ICs.
The REF02 product line delivers high-stability, low-drift voltage references for metrology, industrial instrumentation, and test equipment where absolute accuracy and long-term repeatability are essential.
FAQ
What is the initial output voltage tolerance of the REF02BU/2K5G4?
The REF02BU/2K5G4 has a guaranteed initial output voltage tolerance of ±10mV (±0.2%) at +25°C, as specified in the TI SBVS003B datasheet. This tighter tolerance versus the REF02AU variant makes REF02BU/2K5G4 suitable for applications requiring higher baseline accuracy without factory trimming. The REF02BU/2K5G4 achieves this via laser trimming during production.
Can the REF02BU/2K5G4 output voltage be adjusted, and if so, how?
Yes, the REF02BU/2K5G4 output voltage can be externally adjusted over a ±6% range using a 10kΩ potentiometer connected between VOUT (Pin 7) and GND (Pin 4), with its wiper connected to the Trim pin (Pin 6). This adjustment introduces minimal degradation to temperature stability - approximately 0.7ppm/°C per 100mV of output change. The REF02BU/2K5G4 retains its 10ppm/°C max drift specification even when trimmed.
What is the maximum supply voltage the REF02BU/2K5G4 can withstand?
The REF02BU/2K5G4 has an absolute maximum input voltage rating of +40V, with recommended operating range from +8V to +40V. Exceeding +40V may cause permanent damage. The device includes internal protection circuitry that allows indefinite short-circuit operation at the output, but input overvoltage remains outside safe operating area. Always limit VIN to ≤40V in all conditions for reliable operation of the REF02BU/2K5G4.
Does the REF02BU/2K5G4 provide any built-in temperature sensing capability?
Yes, the REF02BU/2K5G4 features a dedicated Temperature (Temp) pin (Pin 3) that outputs a linear voltage proportional to die temperature: 630mV at +25°C with a coefficient of 2.1mV/°C across –55°C to +125°C. This output is insensitive to capacitive loading and can be used directly for on-chip temperature monitoring or compensation algorithms. The REF02BU/2K5G4's Temp pin does not require external components for basic readout.
What package type and RoHS status does the REF02BU/2K5G4 use?
REF02BU/2K5G4 is supplied in an SOIC-8 (D) package per JEDEC MS-012AA, with 1.27mm lead pitch and 1.75mm max height. It is RoHS-compliant (lead-free), with NIPDAU (nickel-palladium-gold) lead finish and MSL Level-3 moisture sensitivity rating (260°C peak reflow, 168-hour floor life). The "/2K5" suffix indicates 2500-unit tape-and-reel packaging, and "G4" denotes TI's green (halogen-free) material set. All REF02BU/2K5G4 units meet TI's production quality and environmental standards.
REF02BU/2K5G4 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:
- Discontinued at Digi-Key
- 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
REF02BU/2K5G4 FAQ
1.How can I place an order for REF02BU/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02BU/2K5G4 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 REF02BU/2K5G4 reliable?
The price and inventory of REF02BU/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02BU/2K5G4 is usually 5 days.
3.What payment methods are accepted for REF02BU/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02BU/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02BU/2K5G4?
REF02BU/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02BU/2K5G4 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 REF02BU/2K5G4?
For technical support, including REF02BU/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02BU/2K5G4 requirements.
6.How does Aetrix verify that REF02BU/2K5G4 is sourced from the original manufacturer or authorized distributors?
All REF02BU/2K5G4 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 REF02BU/2K5G4 meets industry standards.
7.What is the process for return or replacement of REF02BU/2K5G4?
All REF02BU/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with REF02BU/2K5G4, 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 REF02BU/2K5G4 part is unused and in its original packaging.
Return procedure for REF02BU/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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