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Texas Instruments REF02BU/2K5
- Part No.:
- REF02BU/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF02BU/2K5.pdf
- Description:
- IC VREF SERIES 0.2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:540
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Product details
Overview
REF02BU/2K5 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, draws ≤1.4mA quiescent current, and delivers up to ±21mA load current - ideal for high-accuracy A/D and D/A converters requiring stable excitation.
For engineers reviewing the REF02BU/2K5 datasheet, REF02BU/2K5 pinout, REF02BU/2K5 application, or REF02BU/2K5 equivalent, this device serves as a trimmable, industrial-grade 5V reference with verified line regulation (0.01%/V), load regulation (0.008%/mA), short-circuit protection, and SOIC-8 packaging compatible with automated assembly.
Technical Context
The REF02BU/2K5 implements a laser-trimmed bandgap core with external trim capability via Pin 5 (Trim), enabling ±6% output adjustment while maintaining <0.7ppm/°C/100mV degradation in temperature coefficient. Its internal architecture includes thermal compensation circuitry and on-chip short-circuit current limiting.
It features a dedicated Temperature (Temp) output (Pin 3) delivering 630mV at +25°C with 2.1mV/°C slope, usable for remote temperature sensing or self-calibration. The device achieves 5µs turn-on settling time to ±0.1% and supports indefinite short-circuit duration without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +5.000V ±10mV (±0.2%) at +25°C - ensures binary-compatible 5.12V system calibration when trimmed. |
| Temp Drift | ≤10ppm/°C (–40°C to +85°C) - guarantees ≤±0.5mV total drift across full industrial range. |
| Noise (0.1–10Hz) | ≤10µVPP - minimizes quantization error in 16-bit+ ADC systems. |
| Line Regulation | ≤0.01%/V (8V–33V) - maintains stability under varying input conditions common in unregulated supplies. |
| Load Regulation | ≤0.008%/mA (0–10mA) - sustains accuracy despite dynamic load changes in active filter or DAC bias circuits. |
| Quiescent Current | ≤1.4mA - enables low-power portable instrumentation operation with minimal thermal self-heating. |
| Supply Range | 8V to 40V - accommodates wide-input industrial power rails without external regulators. |
Pinout & Package
REF02BU/2K5 is housed in an SOIC-8 (Package Drawing D) package with 1.27mm lead pitch, 330mm reel diameter, and MSL Level-3 moisture sensitivity rating. Dimensions: 4.90mm × 6.00mm × 1.75mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left floating or grounded per layout guidelines. |
| 2 | VIN | Main power input (8V–40V); internal current limiting protects against overvoltage transients. |
| 3 | Temp | Temperature-sensing output (630mV @ +25°C, 2.1mV/°C); insensitive to capacitive loading. |
| 4 | GND | Analog ground reference; requires low-impedance connection to minimize noise coupling. |
| 5 | Trim | Adjustment terminal for ±6% output tuning using 10kΩ potentiometer; minimal impact on tempco. |
| 6 | NC | No internal connection - no routing required. |
| 7 | VOUT | Stable +5V reference output; capable of sourcing/sinking ±21mA with <0.01% regulation. |
| 8 | NC | No internal connection - must remain unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed output | ±10mV (±0.2%) initial accuracy eliminates need for system-level trimming in calibrated test equipment. |
| External output adjust | ±6% tuning range via Trim pin enables precise offset correction in sensor signal chains without redesign. |
| Integrated temp sensor | Dedicated Temp pin provides factory-calibrated 2.1mV/°C analog output for dual-purpose board-level monitoring. |
| Short-circuit robustness | Indefinite output short-to-ground or VIN tolerance allows safe use in fault-prone industrial environments. |
| Low-noise design | 10µVPP (0.1–10Hz) supports high-resolution metrology applications where flicker noise dominates error budget. |
Applications
| Digital Voltmeters | A/D and D/A Converters |
|---|---|
Use Scenario: High-accuracy benchtop and handheld DVMs requiring stable 5V reference for 6½-digit resolution. IC Role / Device Role / Timing Role: Primary voltage reference for integrating ADC front-end, defining full-scale input range. Use Value: 10ppm/°C drift and 10µVPP noise ensure <0.005% measurement uncertainty over temperature and time. |
Use Scenario: Precision data acquisition systems using 16-bit+ SAR or sigma-delta ADCs/DACs. IC Role / Device Role / Timing Role: Reference source for converter analog section; Trim pin enables gain calibration against known standard. Use Value: 0.008%/mA load regulation prevents code-dependent errors during dynamic conversion sequences. |
| Precision Calibration Standards | Test Equipment |
Use Scenario: Portable calibration sources used in field service for calibrating multimeters and process instruments. IC Role / Device Role / Timing Role: Stable 5V output serving as traceable reference node; Temp pin enables on-board self-diagnostic. Use Value: ±0.2% initial accuracy and 100ppm long-term stability (first 1000h) meet ANSI/NCSL Z540 requirements. |
Use Scenario: Automated test equipment (ATE) fixture boards requiring multiple synchronized reference points. IC Role / Device Role / Timing Role: Reference generator for stimulus generation and measurement subsystems; SOIC-8 enables dense PCB layout. Use Value: 8V–40V supply range simplifies power architecture by eliminating pre-regulation stages in mixed-voltage test racks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF02AU/2K5 | ±15mV (±0.3%) initial accuracy; 15ppm/°C max drift - looser tolerance grade. | Suitable for cost-sensitive industrial controls where ±0.3% system accuracy is acceptable. | Select REF02AU/2K5 only if tighter REF02BU/2K5 specs are unnecessary and BOM cost reduction is prioritized. |
| LM4040CIM3-5.0 | Shunt topology; 0.5% initial accuracy; 100ppm/°C drift; 60µA typical IQ - lower performance, lower cost. | Used in space-constrained, low-power applications like battery-powered sensors where absolute accuracy is secondary. | Choose LM4040CIM3-5.0 only for non-critical references with <1mA load; REF02BU/2K5 is not pin-compatible and requires series-pass configuration. |
Compared with REF02AU/2K5, REF02BU/2K5 delivers tighter initial accuracy and lower drift for metrology-grade designs; versus LM4040CIM3-5.0, it offers superior noise, regulation, and temperature stability but requires higher supply voltage and board area.
Availability
REF02BU/2K5 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/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 and embedded processing technologies, with decades of expertise in precision analog ICs and voltage reference design.
The REF02 family was developed specifically for high-stability, low-drift voltage reference applications in industrial instrumentation, test equipment, and data conversion systems where long-term reliability and temperature resilience are critical.
FAQ
What is the initial output voltage tolerance of the REF02BU/2K5?
The REF02BU/2K5 has a guaranteed initial output voltage tolerance of ±10mV (±0.2%) at +25°C, as specified in the TI SBVS003B datasheet. This tighter tolerance distinguishes it from the REF02AU variant (±15mV) and ensures higher system-level accuracy without post-manufacture trimming. The REF02BU/2K5 achieves this via laser trimming during production.
Can the REF02BU/2K5 be used in a shunt configuration?
No, the REF02BU/2K5 is a series-connected (three-terminal) voltage reference and cannot operate as a shunt device. It requires a minimum 8V input and delivers regulated +5V at Pin 7 (VOUT), with current sourced from VIN through internal pass elements. Attempting shunt operation will result in improper regulation or device damage.
What is the purpose of the Temp pin (Pin 3) on the REF02BU/2K5?
The Temp pin (Pin 3) on the REF02BU/2K5 provides a factory-calibrated analog voltage proportional to die temperature: 630mV at +25°C with a slope of 2.1mV/°C. It is electrically isolated from VOUT and GND, insensitive to capacitive loading, and intended for board-level temperature monitoring or self-compensation algorithms - not for powering external circuitry.
Does the REF02BU/2K5 require an external capacitor on the VOUT pin?
Yes, the REF02BU/2K5 datasheet recommends a 0.1µF ceramic capacitor between VOUT and GND for optimal noise suppression and transient response. This capacitor stabilizes the output under dynamic load conditions and reduces high-frequency noise; omission may increase output ripple and degrade regulation performance in sensitive measurement circuits.
Is the REF02BU/2K5 RoHS compliant and what is its moisture sensitivity level?
Yes, the REF02BU/2K5 is RoHS compliant (lead-free NIPDAU finish) and rated MSL Level-3 (260°C peak reflow, 168-hour floor life), per TI's official packaging addendum. This allows standard SMT assembly processes without special baking requirements, supporting reliable high-volume manufacturing for industrial and test equipment applications.
REF02BU/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:
- ±0.2%
- 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/2K5 FAQ
1.How can I place an order for REF02BU/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02BU/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 REF02BU/2K5 reliable?
The price and inventory of REF02BU/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02BU/2K5 is usually 5 days.
3.What payment methods are accepted for REF02BU/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02BU/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02BU/2K5?
REF02BU/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02BU/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 REF02BU/2K5?
For technical support, including REF02BU/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02BU/2K5 requirements.
6.How does Aetrix verify that REF02BU/2K5 is sourced from the original manufacturer or authorized distributors?
All REF02BU/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 REF02BU/2K5 meets industry standards.
7.What is the process for return or replacement of REF02BU/2K5?
All REF02BU/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with REF02BU/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 REF02BU/2K5 part is unused and in its original packaging.
Return procedure for REF02BU/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF02BU/2K5 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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