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Texas Instruments REF35120QDBVR
- Part No.:
- REF35120QDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-6
- Datasheet:
-
REF35120QDBVR.pdf
- Description:
- IC VREF SERIES 1.2V SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,424
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Product details
Overview
REF35120QDBVR from Texas Instruments is a nanopower, high-precision series voltage reference delivering 1.2V output with ±0.05% initial accuracy, 12ppm/°C max temperature coefficient (−40°C to 105°C), and 650nA typical quiescent current in a 6-pin SOT-23 package. It supports precision sensor biasing and 12–16-bit data converter reference applications in portable and industrial systems.
For engineers reviewing the REF35120QDBVR datasheet, REF35120QDBVR pinout, REF35120QDBVR application, or REF35120QDBVR equivalent, key selection factors include ultra-low IQ, 3.3ppmP-P 0.1Hz–10Hz noise, EN/NR pin control, −55°C to +125°C operating range, and SOT-23 footprint compatibility for space-constrained designs.
Technical Context
The REF35120QDBVR employs a bandgap-based series reference architecture with integrated noise-reduction (NR) and enable (EN) circuitry. Its low-drift design achieves 12ppm/°C TC over −40°C to 105°C and 40ppm long-term stability at 1k hour, enabling stable reference performance in unregulated supply environments.
It operates from VIN = VREF + VDO (min 1.7V for 1.2V output) up to 6V, delivers ±10mA output current, and maintains 20ppm/mA load regulation (source) and 40ppm/mA (sink), supporting dynamic load conditions in precision analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 1.2V nominal - precisely sets ADC/DAC full-scale or sensor excitation level with minimal calibration overhead |
| Initial accuracy | ±0.05% max at 25°C - reduces system-level gain error without per-unit trimming |
| Temp coefficient | 12ppm/°C max (−40°C to 105°C) - limits drift to ±1.26mV over full industrial range |
| Quiescent current | 650nA typical - enables multi-year battery life in always-on IoT sensors and wearables |
| Low-frequency noise | 3.3ppmP-P (0.1Hz–10Hz) - critical for high-resolution DC measurements and low-speed data acquisition |
| Output current | +10mA / −5mA - drives ADC reference inputs, op-amp bias networks, and small-signal transducers directly |
| Enable function | EN pin reduces shutdown current to 0.1µA - allows dynamic power gating in duty-cycled systems |
Pinout & Package
REF35120QDBVR uses a 6-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm with standard lead pitch. Pin 1 and Pin 2 are internally shorted GND connections, optimizing ground path integrity for low-noise operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground | Primary device ground connection; internally shorted to Pin 2 for low-impedance return path |
| GND (Pin 2) | Ground | Secondary ground terminal; enhances thermal and electrical stability in high-PSRR layouts |
| EN (Pin 3) | Input | Active-high enable; floats to enable, pulled low to reduce IQ to 0.1µA in shutdown mode |
| VIN (Pin 4) | Power | Input supply; requires ≥1.7V for 1.2V output and ≤6V absolute max rating |
| NR (Pin 5) | Output | Noise reduction node; connects external capacitor to suppress 1/f noise below 10Hz |
| VREF (Pin 6) | Output | Stable 1.2V reference output; capable of sourcing 10mA or sinking 5mA into load |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 650nA typical active current enables >10-year coin-cell operation in metering and remote sensors |
| NR pin noise control | External capacitor on NR pin reduces 0.1Hz–10Hz noise by up to 50%, improving DC measurement resolution |
| EN pin shutdown | Reduces total supply current to 0.1µA, eliminating standby loss in intermittent-sampling architectures |
| Thermal hysteresis | 70ppm max after −40°C/105°C cycling ensures repeatable accuracy across thermal cycles in field-deployed gear |
| Long-term stability | 40ppm drift at 1k hour confirms reliability for 10+ year deployments in infrastructure monitoring systems |
Applications
| Blood Glucose Monitor | Flow Transmitter |
|---|---|
Use Scenario: Portable handheld medical device measuring glucose concentration via electrochemical sensor. IC Role / Device Role / Timing Role: Provides stable 1.2V reference for ADC converting sensor current to digital value. Use Value: ±0.05% initial accuracy and 3.3ppmP-P noise ensure <1% measurement error without recalibration between tests. |
Use Scenario: Industrial flow meter using differential pressure sensing in water/gas pipelines. IC Role / Device Role / Timing Role: Supplies precision bias to bridge amplifier and reference to 16-bit sigma-delta ADC. Use Value: 12ppm/°C TC and −55°C to +125°C operation maintain accuracy across outdoor ambient swings and process heat. |
| Servo Drive Control Module | Power Quality Analyzer |
Use Scenario: Closed-loop motor controller requiring accurate current sensing and position feedback. IC Role / Device Role / Timing Role: References current-sense amplifier and analog front-end for torque/current loop stability. Use Value: 10mA sourcing capability drives multiple op-amps simultaneously; EN pin enables synchronized sleep during idle periods. |
Use Scenario: Three-phase grid monitor capturing harmonics, THD, and RMS voltage/current waveforms. IC Role / Device Role / Timing Role: Low-noise reference for dual 16-bit simultaneous-sampling ADCs digitizing voltage and current channels. Use Value: 3.3ppmP-P noise and 20ppm/mA load regulation preserve SNR >95dB across full dynamic range and varying line loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3412QDBVR | Higher IQ (3.5µA), same 1.2V output and ±0.05% accuracy, but no NR pin or EN pin | Lacks dynamic noise reduction and shutdown control; suited for fixed-power, non-battery systems | Select when lowest possible cost is prioritized over ultra-low power or noise optimization |
| ADR3412ARJZ-R7 | 1.2V output, ±0.1% initial accuracy, 20ppm/°C TC, 4.5µA IQ, SOT-23-5 package | Lower accuracy and higher drift limit use in sub-12-bit systems; no EN/NR functionality | Choose for legacy designs where ADR34x footprint compatibility is required and 12ppm/°C TC is not mandatory |
Compared with REF35120QDBVR, REF3412QDBVR trades nanopower operation for lower BOM cost, while ADR3412ARJZ-R7 offers Analog Devices' qualification pedigree but sacrifices 0.05% accuracy and ultra-low noise-making REF35120QDBVR optimal for battery-powered, high-resolution metrology.
Availability
REF35120QDBVR is available at Aetrix Electronics and suitable for blood glucose monitors, flow transmitters, servo drive control modules, and power quality analyzers requiring stable component supply across extended temperature and long-lifecycle deployments.
Supply support for REF35120QDBVR 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 power management technologies, serving industrial, automotive, and consumer markets since 1930.
The REF35 family was designed for ultra-low-power, high-precision reference needs in portable instrumentation, medical devices, and industrial sensing-prioritizing nanoscale IQ, sub-10ppm noise, and robust thermal performance.
FAQ
What is the minimum input voltage required for stable operation of REF35120QDBVR?
The minimum input voltage for REF35120QDBVR is 1.7V, as specified for VREF = 1.024V to 1.5V outputs. This ensures sufficient headroom above the 1.2V output to maintain regulation under all load and temperature conditions. Operating below 1.7V risks dropout and output inaccuracy. The REF35120QDBVR datasheet confirms this requirement in Section 6.3 Recommended Operating Conditions.
Does REF35120QDBVR support bidirectional output current, and what are the limits?
Yes, REF35120QDBVR supports both sourcing and sinking current: +10mA maximum source (e.g., driving ADC reference inputs) and −5mA maximum sink (e.g., biasing current-sense amplifiers). These values are specified in Section 6.5 Electrical Characteristics and remain valid across −40°C to 125°C. The REF35120QDBVR maintains 20ppm/mA load regulation when sourcing and 40ppm/mA when sinking.
How does the NR pin on REF35120QDBVR reduce noise, and what capacitor value is recommended?
The NR pin on REF35120QDBVR connects to an external capacitor that forms a low-pass filter with internal impedance, reducing 0.1Hz–10Hz 1/f noise. TI recommends 1µF to 10µF ceramic capacitors (ESR ≤ 400mΩ); 1µF yields ~50% noise reduction versus open NR, while 10µF provides near-maximum suppression. This feature is documented in Section 7.5 Noise Performance and Figure 6-15 of the REF35120QDBVR datasheet.
What is the thermal hysteresis specification for REF35120QDBVR, and how is it measured?
REF35120QDBVR has a maximum thermal hysteresis of 70ppm after one cycle from 25°C → −40°C → 105°C → 25°C. It is measured per JEDEC JESD22-A103 on a standard FR4 PCB, with pre- and post-cycle VREF readings at 25°C. This value reflects real-world board-level stress and ensures repeatability in field-deployed equipment. Full test methodology is detailed in Section 7.4 of the REF35120QDBVR datasheet.
Can REF35120QDBVR be used in automotive applications, and what temperature range does it support?
REF35120QDBVR is functional from −55°C to +125°C and specified for −40°C to +105°C operation, meeting extended temperature requirements for under-hood and cabin electronics. While not AEC-Q200 qualified, its wide range, 12ppm/°C TC, and 40ppm long-term stability make it suitable for non-safety-critical automotive subsystems like body control modules and infotainment sensors-subject to customer qualification. This is confirmed in Section 3 Description and Table 6-1 of the REF35120QDBVR datasheet.
REF35120QDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SOT-23-6
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 12ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3.3ppmp-p
- Noise - 10Hz to 10kHz:
- 0.7ppmrms
- Voltage - Input:
- 1.45V ~ 6V
- Current - Supply:
- 2.6µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
REF35120QDBVR FAQ
1.How can I place an order for REF35120QDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF35120QDBVR 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 REF35120QDBVR reliable?
The price and inventory of REF35120QDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF35120QDBVR is usually 5 days.
3.What payment methods are accepted for REF35120QDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF35120QDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF35120QDBVR?
REF35120QDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF35120QDBVR 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 REF35120QDBVR?
For technical support, including REF35120QDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF35120QDBVR requirements.
6.How does Aetrix verify that REF35120QDBVR is sourced from the original manufacturer or authorized distributors?
All REF35120QDBVR 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 REF35120QDBVR meets industry standards.
7.What is the process for return or replacement of REF35120QDBVR?
All REF35120QDBVR units undergo pre-shipment inspection (PSI). If there is an issue with REF35120QDBVR, 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 REF35120QDBVR part is unused and in its original packaging.
Return procedure for REF35120QDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF35120QDBVR 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
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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