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Texas Instruments REF35125QDBVR
- Part No.:
- REF35125QDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-6
- Datasheet:
-
REF35125QDBVR.pdf
- Description:
- IC VREF SERIES 1.25V SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,860
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Product details
Overview
REF35125QDBVR from Texas Instruments is a nanopower, high-precision series voltage reference delivering 1.25V 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 serves as a stable excitation source for precision bridge sensors and biasing reference for low-power 12–16-bit ADCs in battery-operated instrumentation.
For engineers reviewing the REF35125QDBVR datasheet, REF35125QDBVR pinout, REF35125QDBVR application, or REF35125QDBVR equivalent, key selection considerations include ultra-low IQ, NR/EN pin functionality for noise reduction and shutdown control, thermal hysteresis (70ppm), long-term stability (40ppm at 1k hour), and SOT-23 package compatibility with space-constrained PCB layouts.
Technical Context
The REF35125QDBVR implements a bandgap-based series reference architecture with integrated noise-reduction (NR) and enable (EN) terminals. Its 12ppm/°C drift specification applies specifically to the DBV (SOT-23) package over −40°C to +105°C, and it supports bidirectional load current (±10mA sourcing/sinking) while maintaining 3.3ppmP-P 0.1Hz–10Hz output noise when VREF < 2.5V.
It operates from VIN = VREF + VDO (min 1.7V for 1.25V output) up to 6V, with dropout voltage of 120mV at 5mA and 250mV at 10mA. The device features internal thermal hysteresis compensation and is functional across −55°C to +125°C, though full specifications are guaranteed only from −40°C to +105°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 1.25V ±0.05% (max initial error at 25°C - enables direct use with 12-bit ADCs without calibration) |
| Tempco | 12ppm/°C max (−40°C to +105°C, SOT-23) - ensures ≤±150ppm total drift over industrial range |
| Quiescent current | 650nA typical (active mode) - supports >10-year battery life in µA-level systems |
| Noise (0.1–10Hz) | 3.3ppmP-P (VREF < 2.5V) - provides sub-µVP-P noise floor for high-resolution sensor signal chains |
| Long-term stability | 40ppm at 1000 hours - quantifies aging-induced drift critical for field-deployed metrology equipment |
| Thermal hysteresis | 70ppm (cycle 1, −40°C to +105°C) - defines repeatability error after thermal cycling in harsh environments |
| Load regulation | 20ppm/mA (source), 40ppm/mA (sink) - limits output shift under dynamic sensor excitation loads |
Pinout & Package
REF35125QDBVR 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 integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1 & 2) | Ground reference | Dual-GND configuration reduces ground path impedance and improves PSRR in noisy mixed-signal layouts |
| EN (Pin 3) | Enable control input | Active-high logic; floating or pulled high enables operation; driven low reduces IQ to 0.1µA for system sleep modes |
| VIN (Pin 4) | Input supply | Accepts 1.7V to 6V; dropout voltage ≤250mV ensures operation from single Li-ion or regulated 3.3V rails |
| NR (Pin 5) | Noise reduction node | External capacitor (0.1–10µF) lowers 0.1–10Hz noise; left floating for standard performance |
| VREF (Pin 6) | Precision output | 1.25V reference source capable of ±10mA bidirectional current - supports ratiometric sensor excitation and DAC reference |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (650nA) | Enables multi-year operation from coin-cell batteries in portable diagnostic and IoT edge nodes |
| NR pin with external capacitor | Reduces low-frequency noise by up to 50% - critical for DC-coupled strain gauge and thermocouple front-ends |
| EN pin with sub-µA shutdown | Allows precise power gating in time-sliced measurement systems without external MOSFET switches |
| 12ppm/°C tempco (−40°C to +105°C) | Meets Class A accuracy requirements for industrial process transmitters operating across wide ambient ranges |
| 40ppm long-term stability (1k hr) | Supports 5+ year calibration intervals in flow meter and power quality analyzer applications |
| Bidirectional ±10mA output drive | Eliminates need for external buffer op-amps when driving low-impedance bridge sensors or reference inputs of SAR ADCs |
Applications
| Flow Transmitter | Blood Glucose Monitor |
|---|---|
Use Scenario: Precision analog front-end for differential pressure sensing in Coriolis and magnetic flow meters. IC Role / Device Role / Timing Role: Provides stable 1.25V excitation for Wheatstone bridge sensors and reference for 16-bit sigma-delta ADCs. Use Value: 12ppm/°C tempco and 40ppm long-term drift ensure <0.1% full-scale error over 5 years and temperature cycling. | Use Scenario: Portable handheld glucose meter requiring single-button operation and >2-year shelf life. IC Role / Device Role / Timing Role: Supplies excitation voltage to electrochemical test strips and reference for low-power ADC during measurement bursts. Use Value: 650nA IQ extends battery life; EN pin enables microcontroller-controlled power gating between tests. |
| Servo Drive Control Module | Power Quality Analyzer |
Use Scenario: Current sensing and feedback path in industrial servo amplifiers with isolated gate drivers. IC Role / Device Role / Timing Role: Biasing reference for isolated current-sense amplifiers (CSA) and ADC reference for motor phase current sampling. Use Value: Dual-GND pins minimize ground bounce; ±10mA drive handles CSA bias current without external buffering. | Use Scenario: High-accuracy voltage and current channel conditioning in DIN-rail mounted PQ analyzers. IC Role / Device Role / Timing Role: Reference for 16-bit simultaneous-sampling ADCs capturing harmonics up to 50th order. Use Value: 3.3ppmP-P low-frequency noise prevents baseline drift in 10-second RMS calculations per IEC 61000-4-30. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF34125RTER | Higher IQ (3.5µA), lower tempco (3ppm/°C), no EN/NR pins, 3mm × 3mm WSON package | Requires external enable circuitry; better suited for mains-powered lab equipment than battery devices | Select when ultra-low drift outweighs power savings and board area constraints |
| ADR3412ARJZ-R7 | 5.5µA IQ, 10ppm/°C tempco, no EN/NR, 5-lead TSOT-23, ±0.1% initial accuracy | Lacks shutdown capability; wider initial tolerance increases calibration burden in medical devices | Choose for cost-sensitive industrial controls where 650nA IQ is not required |
Compared with REF34125RTER and ADR3412ARJZ-R7, REF35125QDBVR uniquely balances nanopower operation, integrated EN/NR control, and industrial-grade drift performance in the smallest SOT-23 footprint-making it optimal for space- and energy-constrained portable instrumentation.
Availability
REF35125QDBVR is available at Aetrix Electronics and suitable for flow transmitter design, blood glucose monitoring systems, and servo drive control modules requiring stable component supply with guaranteed long-term availability and traceable lot history.
Supply support for REF35125QDBVR 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The REF35 family was designed for ultra-low-power, high-accuracy voltage references in portable and battery-operated instrumentation-targeting applications demanding sub-ppm/°C stability, nanoscale quiescent current, and robust thermal performance across extended temperature ranges.
FAQ
What is the maximum operating temperature range for REF35125QDBVR?
The REF35125QDBVR is fully specified from −40°C to +105°C and remains functional across −55°C to +125°C. Its 12ppm/°C temperature coefficient guarantee applies strictly within the −40°C to +105°C range for the SOT-23 (DBV) package. Operation beyond +105°C may result in degraded drift performance but does not cause immediate failure.
Does REF35125QDBVR require an external capacitor on the NR pin?
No, the NR pin of REF35125QDBVR can be left floating for standard operation. Connecting a capacitor (0.1–10µF) between NR and GND reduces 0.1Hz–10Hz output noise-typically by 30–50%-which is beneficial in high-resolution DC measurements. The device remains stable without it, as confirmed in TI's SNAS809C datasheet Section 6.5.
What is the minimum input voltage required for REF35125QDBVR to regulate properly?
For REF35125QDBVR (1.25V output), the minimum input voltage is 1.7V per datasheet Section 6.3. This accounts for the dropout voltage (VDO), which is 120mV at 5mA and 250mV at 10mA load. At light loads (<1mA), VIN as low as 1.37V may sustain regulation, but 1.7V is the guaranteed minimum across all conditions and temperatures.
Can REF35125QDBVR sink current, and how much?
Yes, REF35125QDBVR supports bidirectional output current: it can source up to +10mA and sink up to −5mA. This capability allows it to actively pull down reference nodes during power-down sequencing or drive sinking loads like certain DAC reference inputs. Sink performance is characterized with 40ppm/mA load regulation up to 5mA.
How does the dual-GND configuration (Pins 1 & 2) improve performance in REF35125QDBVR?
The internally shorted GND pins (1 and 2) in REF35125QDBVR reduce ground path inductance and impedance asymmetry, improving PSRR by up to 15dB at 100kHz and minimizing ground bounce in high-speed ADC sampling events. This layout-aware feature enhances noise immunity in mixed-signal PCBs without requiring external star-ground routing.
REF35125QDBVR 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):
- 1.25V
- 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:
- 1.5V ~ 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
REF35125QDBVR FAQ
1.How can I place an order for REF35125QDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF35125QDBVR 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 REF35125QDBVR reliable?
The price and inventory of REF35125QDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF35125QDBVR is usually 5 days.
3.What payment methods are accepted for REF35125QDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF35125QDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF35125QDBVR?
REF35125QDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF35125QDBVR 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 REF35125QDBVR?
For technical support, including REF35125QDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF35125QDBVR requirements.
6.How does Aetrix verify that REF35125QDBVR is sourced from the original manufacturer or authorized distributors?
All REF35125QDBVR 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 REF35125QDBVR meets industry standards.
7.What is the process for return or replacement of REF35125QDBVR?
All REF35125QDBVR units undergo pre-shipment inspection (PSI). If there is an issue with REF35125QDBVR, 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 REF35125QDBVR part is unused and in its original packaging.
Return procedure for REF35125QDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF35125QDBVR 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
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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