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Texas Instruments REF35500QDBVR
- Part No.:
- REF35500QDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-6
- Datasheet:
-
REF35500QDBVR.pdf
- Description:
- IC VREF SERIES SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,660
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Product details
Overview
REF35500QDBVR from Texas Instruments is a 5.0V ultra-low-power, high-precision series voltage reference in a 6-pin SOT-23 package, delivering ±0.05% initial accuracy, 12ppm/°C max temperature coefficient (−40°C to 105°C), 650nA typical quiescent current, and 3.3ppmP-P (0.1Hz–10Hz) output noise - optimized for battery-powered precision sensor signal chains and 12–16-bit data converters.
For engineers reviewing the REF35500QDBVR datasheet, REF35500QDBVR pinout, REF35500QDBVR application, or REF35500QDBVR equivalent, this device supports critical low-drift, low-noise biasing of ADCs/DACs, current-sense amplifiers, and optical modules where long-term stability (40ppm at 1k hour), thermal hysteresis control (70ppm), and enable/shutdown functionality are essential.
Technical Context
The REF35500QDBVR implements a nanopower bandgap-based series reference architecture with integrated noise-reduction (NR) and enable (EN) pins, supporting active operation down to 650nA and shutdown current as low as 100nA. Its design targets minimal thermal drift across industrial temperature ranges while maintaining load regulation of 20ppm/mA (source) and line regulation of ≤120ppm/V (for VREF ≥ 2.5V).
It operates from VIN = VREF + VDO (min 1.7V for lower voltages; 5.25V min for 5.0V output) up to 6V, delivers ±10mA output current, and requires only 0.1µF input and 0.1–10µF output capacitance with ESR ≤ 400mΩ - enabling stable performance in space-constrained, low-power embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 5.0V nominal - provides precise, stable bias for 5V-domain ADCs, DACs, and analog front-ends without external scaling. |
| Initial accuracy | ±0.05% max at 25°C - ensures system-level calibration integrity without post-manufacturing trimming. |
| Tempco | 12ppm/°C max (−40°C to 105°C) - limits full-range drift to < ±1.25mV over industrial temperature span. |
| Quiescent current | 650nA typical active / 100nA max shutdown - enables multi-year battery life in portable medical and IoT sensors. |
| Low-frequency noise | 3.3ppmP-P (0.1Hz–10Hz) - minimizes quantization uncertainty in high-resolution DC measurements. |
| Long-term stability | 40ppm at 1000 hours - predicts minimal calibration drift during first year of field operation. |
| Thermal hysteresis | 70ppm (cycle 1, −40°C to 105°C) - defines repeatability error after thermal cycling in harsh environments. |
Pinout & Package
REF35500QDBVR is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, with pins 1 and 2 internally shorted to GND for enhanced grounding and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1 & 2) | Ground reference | Dual GND pins reduce ground impedance and improve PSRR; internal short ensures consistent reference node potential. |
| EN (Pin 3) | Enable control input | Logic-high (>0.7×VIN) activates reference; logic-low (<0.3×VIN) reduces IQ to ≤500nA - enables power-gating in duty-cycled systems. |
| VIN (Pin 4) | Input supply | Accepts 5.25V–6V input (VREF + VDO to 6V); dropout voltage is 250mV at 10mA load. |
| NR (Pin 5) | Noise reduction | Connect external capacitor (1µF typical) to suppress 1/f noise; floating if unused - adds flexibility in noise-sensitive layouts. |
| VREF (Pin 6) | Precision output | Delivers regulated 5.0V with ±5mA sink/source capability; output impedance <1Ω below 10Hz enables direct driving of ADC reference inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 650nA typical active mode - extends shelf life and runtime in energy-harvesting and coin-cell applications. |
| Integrated EN pin | Reduces shutdown current to ≤500nA - eliminates need for external MOSFET switches in low-duty-cycle sensing nodes. |
| Noise reduction (NR) pin | Enables 3.3ppmP-P (0.1Hz–10Hz) noise floor via optional capacitor - achieves sub-16-bit effective resolution without post-filtering. |
| High output drive | ±10mA sourcing/sinking - directly powers precision op-amps, current-sense amplifiers, and SAR ADC references without buffering. |
| Robust thermal performance | 12ppm/°C tempco and 70ppm thermal hysteresis - maintains accuracy in uncontrolled ambient conditions (e.g., outdoor instrumentation). |
Applications
| Blood Glucose Monitor | Power Quality Analyzer |
|---|---|
|
Use Scenario: Portable handheld device measuring glucose concentration via electrochemical strip with 16-bit ADC sampling. IC Role / Device Role / Timing Role: Provides 5.0V reference for ADC and transimpedance amplifier biasing, ensuring <0.1% measurement linearity across 0–50°C ambient. Use Value: 650nA quiescent current enables >5-year battery life; ±0.05% initial accuracy eliminates factory recalibration. |
Use Scenario: Three-phase grid monitor capturing harmonic distortion and RMS voltage with simultaneous 12–14-bit sampling. IC Role / Device Role / Timing Role: Supplies stable 5.0V reference to multiple SAR ADCs and isolation amplifiers in high-noise industrial environments. Use Value: 12ppm/°C tempco and 70ppm thermal hysteresis ensure repeatable calibration after daily thermal cycles in outdoor enclosures. |
| Oscilloscope Front-End | Optical Module Biasing |
|
Use Scenario: Portable digital oscilloscope with 12-bit ADCs and variable gain amplifiers for 10MHz bandwidth signals. IC Role / Device Role / Timing Role: Delivers low-noise 5.0V reference to ADC reference input and programmable gain stage bias networks. Use Value: 3.3ppmP-P (0.1Hz–10Hz) noise prevents baseline wander in DC-coupled acquisition modes. |
Use Scenario: SFP+ transceiver module requiring precise bias for laser diode drivers and TIA feedback networks. IC Role / Device Role / Timing Role: Generates clean 5.0V reference for current mirror biasing and DAC-controlled bias adjustment circuits. Use Value: NR pin support enables <1µVRMS noise floor - critical for minimizing bit-error-rate in 10Gbps optical links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3450QDBVR | Higher quiescent current (3.5µA typ), no EN/NR pins, 10ppm/°C tempco (−40°C to 125°C) | Lacks shutdown and noise filtering - suited for always-on, higher-accuracy industrial systems where power is not constrained. | Choose REF3450QDBVR when extended temperature range (−40°C to 125°C) and tighter tempco outweigh need for ultra-low power. |
| ADR3450ARJZ-R7 | 2.5µA quiescent current, no EN/NR, 10ppm/°C tempco, 5ppm P-P noise (0.1Hz–10Hz), SOT-23-5 | Lower noise but fixed 5-pin configuration - requires PCB redesign if EN/NR functionality is needed. | Choose ADR3450ARJZ-R7 for applications prioritizing lowest possible noise over power savings and configurability. |
Compared with REF35500QDBVR, REF3450QDBVR trades 5.4× higher quiescent current for wider temperature coverage and slightly better tempco, while ADR3450ARJZ-R7 offers lower noise but eliminates enable and noise-reduction flexibility - making REF35500QDBVR optimal for battery-powered, thermally cycled, and noise-sensitive designs requiring dynamic power control.
Availability
REF35500QDBVR is available at Aetrix Electronics and suitable for blood glucose monitors, power quality analyzers, portable oscilloscopes, and optical modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for REF35500QDBVR 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 references.
The REF35 family was designed specifically for ultra-low-power, high-accuracy applications including portable medical devices, industrial sensors, and battery-operated test equipment - emphasizing nanopower operation, low drift, and robust thermal performance.
FAQ
What is the maximum operating temperature range for the REF35500QDBVR?
The REF35500QDBVR is fully specified from −40°C to +105°C and remains functional across −55°C to +125°C. Its 12ppm/°C temperature coefficient applies within the −40°C to +105°C range, and thermal hysteresis is characterized up to +105°C. This makes REF35500QDBVR suitable for industrial and automotive under-hood applications where extended thermal resilience is required.
Does the REF35500QDBVR require an external capacitor on the NR pin?
No - the NR pin of the REF35500QDBVR may be left floating if noise reduction is not required. When used, a 1µF ceramic capacitor to GND reduces 0.1Hz–10Hz output noise to 3.3ppmP-P; larger values further suppress low-frequency noise but increase turn-on time. The REF35500QDBVR remains stable without NR capacitance, preserving design flexibility.
Can the REF35500QDBVR drive a 10kΩ load directly?
Yes - the REF35500QDBVR delivers ±10mA output current, supporting loads down to 500Ω at 5.0V (10mA). A 10kΩ load draws only 0.5mA, well within its sourcing capability. Load regulation is specified at 20ppm/mA, so 0.5mA load shift contributes <10ppm error - negligible for most 16-bit applications.
What is the minimum input voltage required for the REF35500QDBVR to regulate at 5.0V?
The minimum input voltage for the REF35500QDBVR is VREF + VDO, where VDO = 250mV at 10mA load. Thus, minimum VIN = 5.25V. For lighter loads (e.g., 1mA), VDO drops to ~120mV, allowing regulation from 5.12V. Input must not exceed 6V per absolute maximum ratings.
How does the EN pin behavior affect system power sequencing?
The EN pin of the REF35500QDBVR enables controlled power-up: asserting EN > 0.7×VIN initiates turn-on with 2ms settling (0.1%); pulling EN < 0.3×VIN reduces quiescent current to ≤500nA. This allows synchronized activation with microcontroller GPIOs and avoids reference glitches during brown-out recovery - critical for reliable ADC initialization in REF35500QDBVR-based systems.
REF35500QDBVR 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):
- 5V
- 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:
- 5.25V ~ 6V
- Current - Supply:
- 900nA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
REF35500QDBVR FAQ
1.How can I place an order for REF35500QDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF35500QDBVR 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 REF35500QDBVR reliable?
The price and inventory of REF35500QDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF35500QDBVR is usually 5 days.
3.What payment methods are accepted for REF35500QDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF35500QDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF35500QDBVR?
REF35500QDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF35500QDBVR 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 REF35500QDBVR?
For technical support, including REF35500QDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF35500QDBVR requirements.
6.How does Aetrix verify that REF35500QDBVR is sourced from the original manufacturer or authorized distributors?
All REF35500QDBVR 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 REF35500QDBVR meets industry standards.
7.What is the process for return or replacement of REF35500QDBVR?
All REF35500QDBVR units undergo pre-shipment inspection (PSI). If there is an issue with REF35500QDBVR, 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 REF35500QDBVR part is unused and in its original packaging.
Return procedure for REF35500QDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF35500QDBVR Tags
-
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
-
AZ431LANTR-G1
Diodes Incorporated
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