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Texas Instruments REF35125QDBVRQ1
- Part No.:
- REF35125QDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-6
- Datasheet:
-
REF35125QDBVRQ1.pdf
- Description:
- AUTOMOTIVE, 650-NA QUIESCENT CUR
- Quantity:
- Payment:
- Shipping:
Inventory:4,023
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Product details
Overview
REF35125QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to +125°C) ultra-low-power, high-precision series voltage reference delivering 1.25 V output with ±0.05 % initial accuracy, 15 ppm/°C max tempco, 3.3 ppmP-P (0.1 Hz–10 Hz) noise, and 650 nA typical quiescent current - deployed in automotive front camera and battery control unit signal chains.
For engineers reviewing the REF35125QDBVRQ1 datasheet, REF35125QDBVRQ1 pinout, REF35125QDBVRQ1 application, or REF35125QDBVRQ1 equivalent, key selection criteria include nanopower operation under 1 µA, automotive-grade thermal stability across −40°C to +125°C, NR-pin noise reduction capability, EN-controlled shutdown, and SOT-23-6 footprint compatibility with space-constrained PCB layouts.
Technical Context
The REF35125QDBVRQ1 implements a precision bandgap core with buffered output and integrated enable logic, supporting active-mode operation down to 650 nA and shutdown current as low as 0.1 µA. Its architecture includes dedicated NR (noise reduction) and EN (enable) pins, enabling system-level power sequencing and low-noise biasing for 12–16-bit data converters.
It operates as a series reference with dropout voltage of 120 mV at 5 mA and 250 mV at 10 mA, accepts input voltages from VREF + VDO (≥1.7 V for 1.25 V output) up to 6 V, and delivers ±5 mA load current while maintaining 20 ppm/mA sourcing load regulation and 350 ppm/mA sinking regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 1.25 V ±0.05 % - precise, stable bias for ADC/DAC reference inputs and sensor excitation circuits |
| Initial accuracy | ±0.05 % max - eliminates need for post-production trimming in automotive sensor modules |
| Tempco | 15 ppm/°C max (−40°C to +125°C) - ensures <±188 ppm total drift over full automotive ambient range |
| Quiescent current | 650 nA typical, 2.6 µA max - enables multi-year battery life in always-on vehicle subsystems |
| Low-frequency noise | 3.3 ppmP-P (0.1 Hz–10 Hz) - supports high-resolution measurements in bridge-based sensors |
| Load current | +10 mA / −5 mA - sufficient to drive SAR ADC references and instrumentation amplifier bias networks |
| NR pin function | Capacitor-connected noise reduction node - reduces 0.1–10 Hz noise by up to 40 % with 1 µF to GND |
Pinout & Package
REF35125QDBVRQ1 is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density automotive PCBs and compatible with standard reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (pins 1, 2) | Ground reference | Dual ground terminals reduce ground loop impedance and improve PSRR in noisy automotive environments |
| EN (pin 3) | Enable control input | Logic-level input enabling zero-current shutdown; no internal pull-up - supports clean power sequencing |
| VIN (pin 4) | Input supply | Accepts 1.7 V to 6 V; dropout as low as 120 mV allows operation from single-cell LiFePO₄ or regulated 3.3 V rails |
| NR (pin 5) | Noise reduction output | Connect external capacitor (0.1–10 µF) to GND to suppress 1/f noise without affecting DC accuracy |
| VREF (pin 6) | Precision reference output | 1.25 V buffered output with 20 ppm/mA load regulation - drives ADC REF pins and op-amp bias networks directly |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation - meets functional safety requirements for ASIL-B systems |
| Ultra-low quiescent current | 650 nA typical active mode - enables continuous monitoring in low-power wake-up domains |
| Long-term stability | 30 ppm at 1000 hours - minimizes calibration drift in battery management and driver monitoring ECUs |
| EN-controlled shutdown | 0.1 µA shutdown current - eliminates standby leakage in infotainment and ADAS submodules |
| Output noise optimization | 3.3 ppmP-P (0.1–10 Hz) with NR pin - achieves <12-bit effective resolution in thermocouple and strain gauge interfaces |
Applications
| Automotive Front Camera | Driver Monitoring System |
|---|---|
Use Scenario: High-dynamic-range image sensor biasing and ADC reference in ADAS vision modules. IC Role / Device Role / Timing Role: Precision 1.25 V reference for analog front-end and column ADCs. Use Value: 15 ppm/°C tempco and 3.3 ppmP-P noise ensure consistent exposure calibration across −40°C to +85°C vehicle cabin temperatures. |
Use Scenario: IR LED driver bias and analog signal conditioning for eye-tracking and drowsiness detection. IC Role / Device Role / Timing Role: Stable reference for current-sense amplifiers and photodiode transimpedance stages. Use Value: Dual GND pins and 650 nA quiescent current support low-noise, always-on sensing without compromising battery runtime. |
| Battery Control Unit | Electric Power Steering |
Use Scenario: Cell voltage monitoring and state-of-charge estimation in 12 V auxiliary battery systems. IC Role / Device Role / Timing Role: Reference for 16-bit delta-sigma ADCs measuring shunt-based current and cell voltages. Use Value: ±0.05 % initial accuracy and 30 ppm long-term stability reduce recalibration frequency and extend service intervals. |
Use Scenario: Torque sensor signal conditioning and motor phase current sensing in EPS control units. IC Role / Device Role / Timing Role: Low-drift reference for CSA biasing and resolver-to-digital converter excitation. Use Value: NR pin integration lowers 1/f noise contribution to torque measurement error, improving steering feel fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF34125QDBVRQ1 | Higher quiescent current (3.5 µA typ), no NR pin, same 1.25 V output and ±0.05 % accuracy | Lacks noise-reduction capability; less suitable for high-resolution sensor interfaces | Select when lowest possible BOM cost is prioritized over sub-ppm noise performance |
| ADR4512BARMZ-R7 | 1.25 V output, ±0.02 % initial accuracy, 3 ppm/°C tempco, but 475 µA quiescent current and SOIC-8 package | Superior accuracy and drift, but incompatible with space-constrained SOT-23 layouts and unsuitable for battery-powered use | Select only when ultra-low drift dominates over power and size constraints |
Compared with REF34125QDBVRQ1, REF35125QDBVRQ1 adds NR-pin noise suppression and cuts quiescent current by >99 %; compared with ADR4512BARMZ-R7, it trades 0.03 % accuracy and 12 ppm/°C tempco improvement for 730× lower IQ and 60 % smaller footprint - making it optimal for automotive edge nodes where power, size, and noise matter most.
Availability
REF35125QDBVRQ1 is available at Aetrix Electronics and suitable for automotive front camera modules, battery control units, and electric power steering systems requiring stable component supply with AEC-Q100 compliance and extended temperature support.
Supply support for REF35125QDBVRQ1 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 automotive-grade product development and manufacturing excellence.
REF35125QDBVRQ1 belongs to the REF35-Q1 family of nanopower, high-precision voltage references engineered specifically for AEC-Q100 Grade 1 automotive applications demanding ultra-low IQ, low noise, and robust thermal stability.
FAQ
What is the maximum input voltage for REF35125QDBVRQ1?
The absolute maximum input voltage for REF35125QDBVRQ1 is 6.5 V, but the recommended operating range is VREF + VDO to 6 V. For this 1.25 V device, minimum VIN is 1.7 V due to its 120–250 mV dropout. Exceeding 6 V risks permanent damage per Absolute Maximum Ratings.
Does REF35125QDBVRQ1 require an external capacitor on the NR pin?
No - the NR pin on REF35125QDBVRQ1 is optional. Leaving it open yields 3.3 ppmP-P (0.1–10 Hz) noise; connecting 1 µF to GND reduces low-frequency noise by ~30 %. Capacitor values from 0.1 µF to 10 µF are supported, with ESR ≤ 400 mΩ.
Can REF35125QDBVRQ1 be used in non-automotive applications?
Yes - while REF35125QDBVRQ1 is AEC-Q100 qualified and optimized for automotive, its 650 nA quiescent current, 15 ppm/°C tempco, and 1.25 V output make it equally suitable for portable medical devices, IoT sensor nodes, and industrial battery monitors requiring precision and ultra-low power.
What is the turn-on time of REF35125QDBVRQ1?
The REF35125QDBVRQ1 has a typical turn-on time of 2 ms to 0.1 % settling with 1 µF output capacitance and 2.5 V output. For its 1.25 V variant, turn-on time scales linearly with VREF, resulting in ~1 ms typical settling - critical for fast-wake applications like driver monitoring triggers.
How does the dual-GND configuration benefit REF35125QDBVRQ1 performance?
The two dedicated GND pins (pins 1 and 2) in REF35125QDBVRQ1 reduce ground path impedance and separate analog return currents from digital switching noise. This improves PSRR by up to 15 dB and stabilizes output voltage under dynamic load conditions common in automotive ECU power domains.
REF35125QDBVRQ1 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:
- 15ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3.3ppmp-p
- Noise - 10Hz to 10kHz:
- 0.7ppmrms
- Voltage - Input:
- 1.5V ~ 6V
- Current - Supply:
- 2.9µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
REF35125QDBVRQ1 FAQ
1.How can I place an order for REF35125QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF35125QDBVRQ1 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 REF35125QDBVRQ1 reliable?
The price and inventory of REF35125QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF35125QDBVRQ1 is usually 5 days.
3.What payment methods are accepted for REF35125QDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF35125QDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF35125QDBVRQ1?
REF35125QDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF35125QDBVRQ1 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 REF35125QDBVRQ1?
For technical support, including REF35125QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF35125QDBVRQ1 requirements.
6.How does Aetrix verify that REF35125QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All REF35125QDBVRQ1 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 REF35125QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of REF35125QDBVRQ1?
All REF35125QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF35125QDBVRQ1, 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 REF35125QDBVRQ1 part is unused and in its original packaging.
Return procedure for REF35125QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF35125QDBVRQ1 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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