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Texas Instruments REF102AU
- Part No.:
- REF102AU
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF102AU.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,634
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Product details
Overview
REF102AU from Texas Instruments is a precision 10V voltage reference IC with ±10mV initial accuracy, 2.5ppm/°C max temperature drift, and 5ppm/1000hr typical long-term stability-designed for high-accuracy A/D and D/A converter reference applications in industrial instrumentation.
For engineers reviewing the REF102AU datasheet, REF102AU pinout, REF102AU application, or REF102AU equivalent, key selection considerations include its SO-8 package, 11.4V–36V wide input range, low 5µVPP (0.1Hz–10Hz) noise, and laser-trimmed drift performance over –25°C to +85°C.
Technical Context
The REF102AU employs a compensated buried zener diode with laser-trimmed resistor network (R1–R3) to achieve precise 10V output without thermal stabilization. Its architecture delivers exceptional line regulation (1ppm/V max) and load regulation (10ppm/mA max), enabling stable reference operation under varying supply and load conditions.
Pin 5 (Trim) allows external adjustment of output voltage (±3% range) with minimal impact on drift (≈0.008ppm/°C per mV trimmed), while Pin 7 (Noise Reduction) supports capacitor-based high-frequency noise filtering via internal 7kΩ resistor R6.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 10.00 V ±10 mV at +25°C - defines absolute calibration baseline for ADC/DAC full-scale reference |
| Temp Drift | 2.5 ppm/°C max - ensures ≤0.275 mV total error across –25°C to +85°C operating range |
| Long-Term Stability | 5 ppm/1000 hr typ - guarantees <0.005% output shift after 42 days of continuous operation |
| Line Regulation | 1 ppm/V max - limits output change to ≤10 µV per volt input variation across 11.4V–36V supply range |
| Load Regulation | 10 ppm/mA max - restricts output deviation to ≤0.1 mV per mA load current change (0 to +10 mA) |
| Low-Frequency Noise | 5 µVPP (0.1Hz–10Hz) - enables sub-16-bit effective resolution in precision measurement systems |
| Quiescent Current | 1.4 mA max - supports low-power operation while maintaining full specification performance |
Pinout & Package
REF102AU is housed in an 8-pin SOIC (D) package with 1.27 mm lead pitch, 3.9 mm body width, and 1.75 mm max height-compatible with standard surface-mount assembly processes and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Noise Reduction | Connects to internal 7kΩ resistor R6; adding capacitor to ground forms low-pass filter to reduce zener high-frequency noise |
| 2 | Common | Reference ground node; must be star-connected to minimize ground loop errors and noise coupling |
| 3 | NC | No internal connection; left unconnected per design-no routing or termination required |
| 4 | V+ | Positive supply input (11.4V–36V); provides bias for zener and amplifier circuitry |
| 5 | Trim | Adjusts output voltage via external potentiometer; ±3% range with <0.008ppm/°C drift penalty per mV |
| 6 | VOUT | 10V precision output; capable of sourcing +10mA / sinking –5mA with specified regulation |
| 7 | NC | No internal connection; electrically isolated-must remain unconnected |
| 8 | NC | No internal connection; electrically isolated-must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed zener + op-amp topology | Eliminates need for heater-based stabilization-reducing power consumption and warm-up time to 15 µs (to 0.1%) |
| External trim capability | Enables system-level calibration without degrading core drift spec beyond 0.008ppm/°C per mV adjusted |
| Noise reduction pin | Supports 1µF capacitor to cut broadband noise from ~800µVPP to <200µVPP (f−3dB ≈22Hz) |
| Wide supply range | Operates from 11.4V to 36V-enables direct use with common industrial DC rails (e.g., 12V, 24V, 32V) |
| Short-circuit protection | Withstands continuous short to common or V+-enhances robustness in test equipment and automated systems |
Applications
| Digital Voltmeter Reference | A/D Converter Reference |
|---|---|
Use Scenario: High-resolution benchtop digital voltmeter requiring 6½-digit accuracy and stable 10V reference for autoranging. IC Role / Device Role / Timing Role: Primary voltage reference source for integrating ADC and scaling circuitry. Use Value: 2.5ppm/°C drift and 5ppm/1000hr stability ensure calibration validity over extended measurement sessions without recalibration. | Use Scenario: 16-bit SAR ADC in programmable logic controller analog input module. IC Role / Device Role / Timing Role: Precision reference for ADC conversion, directly determining full-scale voltage and LSB size. Use Value: 5µVPP (0.1Hz–10Hz) noise enables >15.6 ENOB at 10V FS, meeting industrial accuracy requirements. |
| Precision Current Source | Comparator Threshold Reference |
Use Scenario: Programmable 4–20mA transmitter with microcontroller-controlled current setpoint. IC Role / Device Role / Timing Role: Stable 10V reference feeding precision current-sense resistor and op-amp feedback loop. Use Value: 1ppm/V line regulation prevents current error due to supply ripple-critical for field instrument EMC compliance. | Use Scenario: Overvoltage protection circuit in battery management system using fast comparator. IC Role / Device Role / Timing Role: Fixed threshold reference for comparator detecting cell voltage exceedance. Use Value: ±10mV initial accuracy and low drift ensure trip point remains within ±0.1% over temperature and lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF102BU | ±5mV initial error (vs ±10mV), same SO-8 package and 2.5ppm/°C drift | Higher initial accuracy required for metrology-grade calibration standards | Select REF102BU when tighter initial tolerance is mandatory and budget allows premium grade |
| REF5010AID | 10V output, 3ppm/°C max drift, 3µVPP noise, SO-8, but requires ≥12V supply | Lower noise and improved drift for next-generation test equipment | Choose REF5010AID when upgrading legacy designs needing enhanced noise performance and modern process reliability |
Compared with REF102BU, REF102AU trades 5mV initial accuracy for cost efficiency while retaining identical drift and stability specs; versus REF5010AID, it offers wider supply range (11.4V vs 12V min) and proven field reliability in industrial instrumentation, albeit with higher noise.
Availability
REF102AU is available at Aetrix Electronics and suitable for precision instrumentation, automated test equipment, and industrial data acquisition systems requiring stable component supply and long-term calibration integrity.
Supply support for REF102AU 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.
The REF102 product line was engineered specifically for high-stability, low-drift voltage reference needs in industrial and test instrumentation-prioritizing laser-trimmed accuracy, thermal robustness, and noise performance without heater-based architectures.
FAQ
What is the maximum operating temperature range for the REF102AU?
The REF102AU is specified for operation from –25°C to +85°C, with storage temperature rated from –40°C to +125°C. This industrial-grade range supports deployment in factory automation, motor drives, and environmental monitoring systems where ambient temperatures fluctuate significantly. The REF102AU maintains its 2.5ppm/°C max drift and ±10mV initial accuracy across this full range.
Can the REF102AU drive a 10kΩ load directly?
Yes, the REF102AU can drive a 10kΩ load directly at 10V output, drawing only 1mA-well within its +10mA sourcing capability. Load regulation is specified at 10ppm/mA max, so the output will shift by ≤10µV, preserving accuracy. For loads below 1kΩ or dynamic current demands, consider buffering with an op-amp such as OPA227 as shown in REF102AU application Figure 7a.
Does the REF102AU require an external capacitor on the Noise Reduction pin?
No, the REF102AU operates fully specified without any external capacitor on Pin 1 (Noise Reduction). However, adding a 1µF capacitor between Pin 1 and ground reduces high-frequency noise from ~800µVPP to <200µVPP, which is beneficial in sensitive measurement circuits. The internal 7kΩ resistor forms a 22Hz low-pass filter with that capacitor-no additional components are needed.
Is the REF102AU pin-compatible with other REF102 variants like REF102CU?
Yes, all REF102 variants-including REF102AU, REF102BU, and REF102CU-are pin-compatible in SO-8 (D) and DIP-8 packages. They share identical pinout, electrical interface, and footprint. The differences lie solely in initial accuracy (±10mV, ±5mV, ±2.5mV) and corresponding drift specifications-all maintain the same 2.5ppm/°C max drift for the 'A' and 'B' grades in SO-8.
What is the purpose of the Trim pin (Pin 5) on the REF102AU?
The Trim pin (Pin 5) on the REF102AU allows external adjustment of the output voltage over a ±3% range (±300mV) using a potentiometer, enabling system-level calibration. Each mV of trim introduces approximately 0.008ppm/°C additional drift-so trimming 10mV adds ~0.08ppm/°C to the base 2.5ppm/°C spec. The REF102AU datasheet provides two recommended circuits (Figures 3 and 4) for coarse and fine adjustment.
REF102AU 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:
- ±0.1%
- Temperature Coefficient:
- 10ppm/°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
REF102AU FAQ
1.How can I place an order for REF102AU through Aetrix?
Please submit a Request for Quotation (RFQ) for REF102AU 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 REF102AU reliable?
The price and inventory of REF102AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF102AU is usually 5 days.
3.What payment methods are accepted for REF102AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF102AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF102AU?
REF102AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF102AU 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 REF102AU?
For technical support, including REF102AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF102AU requirements.
6.How does Aetrix verify that REF102AU is sourced from the original manufacturer or authorized distributors?
All REF102AU 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 REF102AU meets industry standards.
7.What is the process for return or replacement of REF102AU?
All REF102AU units undergo pre-shipment inspection (PSI). If there is an issue with REF102AU, 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 REF102AU part is unused and in its original packaging.
Return procedure for REF102AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF102AU Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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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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