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Texas Instruments REF102BU
- Part No.:
- REF102BU
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF102BU.pdf
- Description:
- IC VREF SERIES 0.05% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:435
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Product details
Overview
REF102BU from Texas Instruments is a precision 10V voltage reference IC with ±5mV initial accuracy and ±5ppm/°C max temperature drift over –25°C to +85°C. It delivers ultra-low noise (5µVPP, 0.1Hz–10Hz), excellent line regulation (1ppm/V max), and load regulation (10ppm/mA max), operating from 11.4V to 36V supply. It serves as a stable reference in high-resolution data acquisition systems requiring traceable calibration.
For engineers reviewing the REF102BU datasheet, REF102BU pinout, REF102BU application, or REF102BU equivalent, key selection criteria include its SO-8 package, laser-trimmed drift performance, external trim capability (±3% range), noise reduction pin functionality, and compatibility with precision ADC/DAC reference, comparator threshold, and digital voltmeter designs.
Technical Context
The REF102BU uses a compensated buried zener diode combined with a precision op amp and laser-trimmed resistor network to generate its 10V output-achieving stability without thermal heating. Its drift specification follows the box method over –25°C to +85°C, with worst-case output variation bounded by ±2.75mV across temperature.
It features a dedicated Noise Reduction pin that forms a low-pass filter (f−3dB ≈ 22Hz with 1µF) with internal R6 (7kΩ), reducing broadband noise from ~800µVPP to <200µVPP. Output voltage can be externally trimmed via the VTRIM pin with minimal impact on drift (≈0.008ppm/°C per mV adjusted).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 10.000V ±0.005V at 25°C - enables sub-0.05% absolute accuracy in 16-bit+ converter references. |
| Temp Drift | ±5ppm/°C max - ensures ≤±0.55mV total deviation over full industrial range (–25°C to +85°C). |
| Line Regulation | 1ppm/V max - maintains output stability despite ±1V supply variation, critical for unregulated supplies. |
| Load Regulation | 10ppm/mA max (0 to +10mA) - supports direct driving of 10kΩ loads with <0.1mV error. |
| Low-Freq Noise | 5µVPP (0.1Hz–10Hz) - minimizes quantization uncertainty in precision DC measurements. |
| Quiescent Current | 1.4mA max - allows operation in low-power instrumentation with minimal self-heating. |
| Supply Range | +11.4V to +36V - accommodates wide-input industrial power rails without external regulators. |
Pinout & Package
REF102BU is housed in an SOIC-8 (D) package, 3.94mm height, JEDEC MS-012 AA compliant, with 1.27mm pitch and NIPDAU lead finish. MSL Level-2-260°C-1 year rating supports standard reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Noise Reduction | Connects to internal 7kΩ resistor; adding 1µF capacitor to ground reduces high-frequency zener noise by >75%. |
| 2 | Common | Reference ground node; must be star-connected to minimize ground loop errors and noise coupling. |
| 3 | VOUT | 10V precision output; capable of sourcing +10mA/sinking –5mA with <0.01% load-induced error. |
| 4 | Trim | Adjusts output voltage ±3% via external potentiometer; TCR-matched internal resistors limit drift impact. |
| 5 | NC | No connection - left floating; no internal circuitry attached. |
| 6 | V+ | Positive supply input; accepts 11.4V–36V; includes internal short-circuit protection to V+ or Common. |
| 7 | NC | No connection - left floating; no internal circuitry attached. |
| 8 | NC | No connection - left floating; no internal circuitry attached. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed zener-based architecture | Eliminates heater requirement, enabling fast warm-up (<15µs to 0.1%), low power, and superior long-term stability (5ppm/1000hr typ). |
| Dedicated noise reduction terminal | Enables configurable low-pass filtering (22Hz cutoff with 1µF) to suppress zener broadband noise without external op amps. |
| External output trim with drift compensation | ±3% adjustment range with <0.008ppm/°C/mV drift penalty - preserves metrology-grade accuracy after field calibration. |
| Robust supply rejection | 130dB PSRR at DC, >100dB up to 1kHz - rejects ripple from switching supplies in mixed-signal PCBs. |
| Wide operating supply range | 11.4V–36V operation supports direct use with 12V/24V industrial rails and eliminates need for pre-regulation. |
Applications
| High-Accuracy Data Acquisition | Precision Test Equipment |
|---|---|
Use Scenario: 24-bit delta-sigma ADC front-end in portable calibrators requiring NIST-traceable voltage standards. IC Role / Device Role / Timing Role: Primary reference source for ADC conversion, defining full-scale voltage with sub-ppm stability over time and temperature. Use Value: ±5ppm/°C drift and 5µVPP noise ensure <0.001% measurement uncertainty across 0–50°C ambient shifts. | Use Scenario: Digital multimeter (DMM) reference subsystem where auto-ranging and autoranging require consistent 10V baseline. IC Role / Device Role / Timing Role: Stable 10V reference for internal DACs, integrator resets, and analog switch thresholds in dual-slope architectures. Use Value: 1ppm/V line regulation prevents reading errors during battery voltage sag or AC adapter ripple events. |
| Calibration Lab Standards | Industrial Sensor Signal Conditioning |
Use Scenario: Benchtop voltage calibrator used to verify 7½-digit DMMs and process calibrators in ISO/IEC 17025 labs. IC Role / Device Role / Timing Role: Primary 10V reference in programmable voltage sources, supporting manual and automated calibration workflows. Use Value: 5ppm/1000hr stability enables 90-day calibration intervals without recalibration drift exceeding tolerance limits. | Use Scenario: Strain gauge bridge excitation and offset nulling in load cell transmitters deployed in factory automation. IC Role / Device Role / Timing Role: Precision excitation source and zero-reference for INA126/INA105 instrumentation amplifiers. Use Value: Low quiescent current (1.4mA) and wide supply range allow direct integration into 24V loop-powered transmitters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5010IDR | 10V, ±10ppm/°C max, 3.8µVPP noise, SO-8, 3.3V–36V supply | Higher drift and lower noise floor; optimized for low-voltage systems with tighter supply constraints | Choose when supply headroom is limited below 11.4V or when cost sensitivity outweighs drift requirements |
| ADR441BRZ | 10V, ±3ppm/°C max, 1.8µVPP noise, SO-8, 10.5V–36V supply | Lower drift and noise, but higher quiescent current (4.5mA); requires external decoupling for optimal PSRR | Choose for metrology-grade applications demanding <3ppm/°C drift and sub-2µVPP noise, accepting higher power draw |
Compared with REF102BU, REF5010IDR offers wider supply flexibility but trades 2× drift and higher noise, while ADR441BRZ delivers superior drift/noise performance at nearly 3× quiescent current and stricter layout sensitivity-making REF102BU the balanced choice for industrial instrumentation where 5ppm/°C and 5µVPP meet design margins.
Availability
REF102BU is available at Aetrix Electronics and suitable for precision test equipment, industrial sensor signal conditioning, and calibration lab standards requiring stable component supply with guaranteed long-term continuity.
Supply support for REF102BU 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 high-reliability components for industrial, automotive, and precision measurement markets.
The REF102 product line was engineered specifically for metrology-grade voltage referencing in instrumentation, calibration, and high-resolution data conversion-prioritizing long-term stability, low thermal drift, and noise immunity over cost or speed.
FAQ
What is the maximum allowable supply voltage for REF102BU?
The absolute maximum input voltage for REF102BU is +40V, but its specified operating range is +11.4V to +36V DC. Operation above +36V risks exceeding safe power dissipation limits and may degrade long-term stability. The device includes continuous short-circuit protection to both V+ and Common, enhancing robustness in industrial environments where supply transients occur.
Can REF102BU drive a 10kΩ load without significant error?
Yes, REF102BU can drive a 10kΩ load with ≤0.1mV error. With a maximum load regulation of 10ppm/mA and rated output current of +10mA/–5mA, a 1mA load (as drawn by a 10kΩ resistor at 10V) introduces only 10ppm × 1mA = 0.01mV shift - well within its ±5mV initial accuracy. Layout best practices (star grounding, short traces) are recommended to preserve this performance.
How does the Noise Reduction pin on REF102BU function in practice?
The Noise Reduction pin on REF102BU connects internally to a 7kΩ resistor; adding a 1µF capacitor to ground forms a first-order RC low-pass filter with f−3dB ≈ 22Hz. This attenuates high-frequency zener noise, reducing broadband noise from ~800µVPP to under 200µVPP. TI's typical characteristics show >75% noise suppression without requiring external op amps or complex filtering networks.
Is REF102BU pin-compatible with other REF102 variants like REF102AU or REF102CU?
Yes, all REF102 variants-including REF102AU, REF102BU, and REF102CU-are fully pin-compatible in SO-8 (D) and DIP-8 (P) packages. They share identical pinouts, electrical interfaces, and thermal characteristics. Performance differences (initial accuracy ±10mV/±5mV/±2.5mV and drift ±10/±5/±2.5ppm/°C) are achieved through laser trimming during final test, not structural changes.
What is the warm-up time specification for REF102BU?
REF102BU achieves 0.1% output stability in ≤15µs after power application, as measured with the Noise Reduction pin floating. This fast warm-up results from its heaterless zener architecture-eliminating thermal inertia-and makes it suitable for applications requiring rapid power cycling or burst-mode operation, such as automated test equipment (ATE) and portable calibration tools.
REF102BU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 10V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 5ppm/°C
- Noise - 0.1Hz to 10Hz:
- 5µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 11.4V ~ 36V
- Current - Supply:
- 1.4mA
- Current - Cathode:
- -
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF102BU FAQ
1.How can I place an order for REF102BU through Aetrix?
Please submit a Request for Quotation (RFQ) for REF102BU 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 REF102BU reliable?
The price and inventory of REF102BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF102BU is usually 5 days.
3.What payment methods are accepted for REF102BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF102BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF102BU?
REF102BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF102BU 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 REF102BU?
For technical support, including REF102BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF102BU requirements.
6.How does Aetrix verify that REF102BU is sourced from the original manufacturer or authorized distributors?
All REF102BU 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 REF102BU meets industry standards.
7.What is the process for return or replacement of REF102BU?
All REF102BU units undergo pre-shipment inspection (PSI). If there is an issue with REF102BU, 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 REF102BU part is unused and in its original packaging.
Return procedure for REF102BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF102BU 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
Microchip Technology
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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