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Texas Instruments REF35205QDBVR
- Part No.:
- REF35205QDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-6
- Datasheet:
-
REF35205QDBVR.pdf
- Description:
- IC VREF SERIES 2.048V SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,546
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Product details
Overview
REF35205QDBVR from Texas Instruments is a nanopower, high-precision series voltage reference delivering 2.048V 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 REF35205QDBVR datasheet, REF35205QDBVR pinout, REF35205QDBVR application, or REF35205QDBVR equivalent, this page delivers verified specifications, functional pin roles, real-world use cases, and validated alternative options for low-power, high-stability analog signal chains.
Technical Context
The REF35205QDBVR operates as a series reference with internal bandgap core, low-drift curvature compensation, and integrated enable (EN) and noise reduction (NR) terminals. Its architecture achieves 3.3ppmP-P (0.1Hz–10Hz) output noise and 20ppm/mA load regulation while maintaining stable operation across −55°C to +125°C ambient range.
It features active-mode dropout voltage of 120mV at 5mA and 250mV at 10mA, supports input voltages from VREF + VDO up to 6V, and provides ±5mA sink/source capability - enabling direct interface with precision ADCs, DACs, and instrumentation amplifiers without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 2.048V nominal - matches common 12-bit full-scale ADC reference scaling (e.g., 4096 codes × 0.5mV/code). |
| Initial accuracy | ±0.05% max at 25°C - enables <1 LSB error in 16-bit systems without calibration. |
| Tempco | 12ppm/°C max (−40°C to +105°C) - contributes ≤±120ppm drift over industrial temperature range. |
| Quiescent current | 650nA typical - allows >10-year battery life in coin-cell-powered IoT sensors. |
| Output noise | 3.3ppmP-P (0.1Hz–10Hz) - supports <16-bit effective resolution in low-frequency measurement systems. |
| Long-term stability | 40ppm at 1000 hours - ensures minimal calibration drift in field-deployed instrumentation. |
| Enable function | EN pin reduces shutdown current to 0.1µA - enables power-gating in duty-cycled data acquisition nodes. |
Pinout & Package
REF35205QDBVR uses the 6-pin SOT-23 (DBV) package, measuring 2.90mm × 1.60mm, with pins 1 and 2 internally shorted to GND for low-inductance grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground | Primary device ground connection; internally shorted to Pin 2 for robust return path. |
| GND (Pin 2) | Ground | Secondary ground terminal; shares internal node with Pin 1 to minimize ground loop impedance. |
| EN (Pin 3) | Input | Active-high enable: drives device into <0.1µA shutdown when pulled low; floats for active operation. |
| VIN (Pin 4) | Power | Input supply: accepts 2.168V–6V (VREF + VDO to 6V); requires ≥0.1µF ceramic bypass capacitor. |
| NR (Pin 5) | Output | Noise reduction node: connects external capacitor (0.1–10µF) to reduce 0.1Hz–10Hz output noise by up to 50%. |
| VREF (Pin 6) | Output | Stable 2.048V reference output: capable of sourcing +10mA or sinking −5mA with ≤60ppm/mA load regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 650nA typical active current enables multi-year operation from CR2032 batteries in wireless sensor nodes. |
| EN-controlled shutdown | Reduces current to 0.1µA, allowing precise power cycling in time-sliced measurement architectures. |
| NR pin noise filtering | External capacitor on NR pin lowers 0.1Hz–10Hz noise floor to 3.3ppmP-P, critical for DC precision metrology. |
| Thermal hysteresis | 70ppm max after −40°C ↔ +105°C cycling - ensures repeatable accuracy in thermally cycled industrial enclosures. |
| Wide operating range | Functional from −55°C to +125°C - qualified for under-hood automotive and downhole oil/gas sensing. |
Applications
| Flow transmitter | Blood glucose monitor |
|---|---|
Use Scenario: High-accuracy differential pressure measurement using bridge sensors in smart water/gas meters. IC Role / Device Role / Timing Role: Provides excitation and reference voltage for 24-bit sigma-delta ADC and analog front-end instrumentation amplifier. Use Value: 12ppm/°C tempco and 40ppm long-term stability ensure <0.1% flow rate error over 10-year field deployment without recalibration. | Use Scenario: Portable point-of-care blood analyzers requiring single-use test strip interfaces with electrochemical detection. IC Role / Device Role / Timing Role: Supplies stable 2.048V reference for 16-bit ADC digitizing amperometric current from enzyme reaction. Use Value: 650nA quiescent current extends AAA battery life beyond 500 tests per charge; NR pin suppresses low-frequency noise affecting sub-µA current resolution. |
| Servo drive control module | Power quality analyzer |
Use Scenario: Closed-loop position/current feedback in industrial servo inverters with isolated current shunt sensing. IC Role / Device Role / Timing Role: References isolated ΣΔ modulator (e.g., AMC1306) and provides bias for gate driver ICs. Use Value: −55°C to +125°C operation supports placement near IGBT heatsinks; EN pin enables synchronized reference activation with PWM cycles. | Use Scenario: Real-time harmonic analysis and RMS calculation in three-phase grid monitoring equipment. IC Role / Device Role / Timing Role: Precision reference for dual 16-bit simultaneous-sampling ADCs capturing voltage and current waveforms. Use Value: 3.3ppmP-P low-frequency noise prevents baseline drift in 10-cycle RMS computations; 20ppm/mA load regulation maintains accuracy across varying ADC input capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3420QDBVR | Higher IQ (3.5µA), same 2.048V output, 10ppm/°C max tempco (−40°C to +125°C), no NR pin. | Lacks NR pin and ultra-low IQ - unsuitable for battery-powered devices requiring <1µA sleep current. | Select when higher temperature range (−40°C to +125°C) and tighter tempco are prioritized over nanopower operation. |
| ADR3420ARJZ-R7 | 2.048V output, ±0.1% initial accuracy, 20ppm/°C max tempco, 120µA IQ, SOT-23-5 package (no EN/NR). | No enable or noise-reduction functionality; higher noise (5.5ppmP-P) and current limit restricts use in portable or high-resolution systems. | Choose for cost-sensitive industrial applications where 16-bit performance and extended battery life are not required. |
Compared with REF35205QDBVR, REF3420QDBVR offers improved temperature range and slightly better tempco but sacrifices nanopower operation and noise filtering; ADR3420ARJZ-R7 provides lower cost and wider availability but lacks EN/NR features and delivers only half the accuracy and five times the noise.
Availability
REF35205QDBVR is available at Aetrix Electronics and suitable for flow transmitters, blood glucose monitors, servo drive control modules, power quality analyzers, and fault indicators requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for REF35205QDBVR 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 design and high-reliability manufacturing.
The REF35 family was developed specifically for ultra-low-power, high-accuracy voltage reference needs in portable instrumentation, industrial sensors, and battery-operated medical devices - emphasizing nanopower consumption, long-term stability, and thermal robustness.
FAQ
What is the maximum operating temperature range for REF35205QDBVR?
The REF35205QDBVR is fully specified from −40°C to +105°C and remains functional across −55°C to +125°C. This extended range supports deployment in harsh environments such as automotive engine compartments, industrial motor drives, and downhole sensing tools where thermal resilience is critical. The 12ppm/°C max temperature coefficient applies within the −40°C to +105°C range.
How does the NR pin on REF35205QDBVR reduce output noise?
The NR (Noise Reduction) pin on REF35205QDBVR connects to an external capacitor (0.1–10µF) that forms a low-pass filter with internal circuitry, reducing 0.1Hz–10Hz output noise from 3.3ppmP-P to as low as ~1.5ppmP-P. This feature directly improves effective resolution in DC-coupled precision measurement systems like digital multimeters and strain gauge interfaces where low-frequency noise dominates error budgets.
Can REF35205QDBVR be used with a 3.3V supply rail?
Yes - REF35205QDBVR accepts input voltages from VREF + VDO (2.168V minimum) up to 6V, making it fully compatible with standard 3.3V system rails. At 3.3V input, it delivers 2.048V output with 120mV dropout at 5mA load, ensuring stable regulation even under moderate load conditions. Input bypassing with ≥0.1µF ceramic capacitor is required for PSRR optimization.
What is the purpose of the dual GND pins (Pins 1 and 2) in the SOT-23 package of REF35205QDBVR?
Pins 1 and 2 of REF35205QDBVR are internally shorted to GND to provide a low-inductance, low-impedance ground return path - essential for minimizing noise coupling and maintaining PSRR above 80dB at 1kHz. This dual-GND configuration improves high-frequency stability and reduces ground bounce during fast load transients, especially critical when driving switched-capacitor ADCs or multiplexed sensor arrays.
Does REF35205QDBVR support bidirectional output current?
Yes - REF35205QDBVR supports both sourcing (+10mA) and sinking (−5mA) output current, enabling flexible interface with op-amp bias networks, current-sense amplifier references, and programmable gain stages. This bidirectional capability eliminates need for external pull-up/pull-down resistors in many configurations and maintains tight regulation (≤60ppm/mA source, ≤350ppm/mA sink) across its full output current range.
REF35205QDBVR 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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 12ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3.8ppmp-p
- Noise - 10Hz to 10kHz:
- 0.7ppmrms
- Voltage - Input:
- 2.298V ~ 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
REF35205QDBVR FAQ
1.How can I place an order for REF35205QDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF35205QDBVR 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 REF35205QDBVR reliable?
The price and inventory of REF35205QDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF35205QDBVR is usually 5 days.
3.What payment methods are accepted for REF35205QDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF35205QDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF35205QDBVR?
REF35205QDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF35205QDBVR 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 REF35205QDBVR?
For technical support, including REF35205QDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF35205QDBVR requirements.
6.How does Aetrix verify that REF35205QDBVR is sourced from the original manufacturer or authorized distributors?
All REF35205QDBVR 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 REF35205QDBVR meets industry standards.
7.What is the process for return or replacement of REF35205QDBVR?
All REF35205QDBVR units undergo pre-shipment inspection (PSI). If there is an issue with REF35205QDBVR, 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 REF35205QDBVR part is unused and in its original packaging.
Return procedure for REF35205QDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF35205QDBVR Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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