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Texas Instruments REF35500QDBVRQ1
- Part No.:
- REF35500QDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-6
- Datasheet:
-
REF35500QDBVRQ1.pdf
- Description:
- AUTOMOTIVE, 650-NA QUIESCENT CUR
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
REF35500QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to +125°C) ultra-low-power, high-precision series voltage reference delivering 5.0 V output with ±0.05 % initial accuracy, 15 ppm/°C max temperature coefficient, 3.3 ppmP-P (0.1 Hz–10 Hz) low-frequency noise, and 650 nA typical quiescent current. It serves as a stable reference for precision ADCs, sensor signal chains, and automotive power management in space-constrained modules.
For engineers reviewing the REF35500QDBVRQ1 datasheet, REF35500QDBVRQ1 pinout, REF35500QDBVRQ1 application, or REF35500QDBVRQ1 equivalent, this page delivers verified technical context, real-world design implications of its nanopower operation, noise-reduction architecture, and automotive-grade thermal stability - all grounded in TI's SNAS845 production data sheet.
Technical Context
The REF35500QDBVRQ1 implements a precision band-gap core with integrated low-noise buffer and active EN control logic, enabling clean startup/shutdown without internal pull-ups. Its architecture supports bidirectional load capability (±5 mA sink/source) and features a dedicated NR pin for external capacitor-based noise filtering.
It operates across −55°C to +125°C with functional specification over −40°C to +125°C, uses a 6-pin SOT-23 package with dual GND pins for improved thermal and noise performance, and achieves 30 ppm long-term stability at 1k hours under 35°C oil-bath conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 5.0 V nominal - enables direct interface with 5 V ADC references and analog front-ends without level-shifting. |
| Initial accuracy | ±0.05 % max - reduces system calibration burden and improves end-product test yield in automotive sensor modules. |
| Tempco | 15 ppm/°C max (−40°C to +125°C) - ensures < ±187.5 ppm total drift over full automotive ambient range. |
| Quiescent current | 650 nA typical - allows >10-year battery life in always-on vehicle monitoring systems drawing <1 µA standby current. |
| Low-frequency noise | 3.3 ppmP-P (0.1 Hz–10 Hz) - supports 16-bit effective resolution in precision bridge-sensor measurements. |
| Load current | +10 mA / −5 mA - drives multiple op-amps or SAR ADC references while maintaining regulation under dynamic loads. |
| Dropout voltage | 250 mV max at 10 mA - permits operation from single-cell LiFePO₄ (3.2 V min) or 5 V rail with margin. |
| EN pin behavior | No internal pull-up; zero current draw when pulled low - eliminates leakage path in deep-sleep MCU states. |
Pinout & Package
REF35500QDBVRQ1 is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for automotive PCB layouts requiring thermal robustness and minimal footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary device ground connection; must be tied to low-impedance system ground plane. |
| GND (Pin 2) | Ground reference | Secondary ground terminal - improves thermal dissipation and reduces ground bounce in high-dynamic-load scenarios. |
| EN (Pin 3) | Enable control input | Logic-level enable: floating or high (>0.7×VIN) activates device; low (<0.3×VIN) places REF35500QDBVRQ1 in shutdown (0.1 µA IQ). |
| VIN (Pin 4) | Power supply input | Accepts 5.25 V to 6 V (for 5 V output); minimum = VREF + VDO = 5.25 V (typical) to ensure regulation. |
| NR (Pin 5) | Noise reduction node | Connects to external capacitor (1 µF–10 µF) to reduce 0.1–10 Hz noise by up to 50%; open for default noise performance. |
| VREF (Pin 6) | Reference output | Stable 5.0 V output; capable of sourcing 10 mA or sinking 5 mA while maintaining ±20 ppm/mA load regulation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation - meets automotive front-camera and EPS ECU reliability requirements. |
| NR pin with external capacitor support | Reduces 0.1–10 Hz noise by >30% with 1 µF to GND - critical for thermocouple and strain-gauge measurement stability. |
| "Clean EN" architecture | Zero static current on EN pin in shutdown - eliminates parasitic discharge paths in battery-backed safety-critical systems. |
| Long-term stability | 30 ppm drift over 1000 hours at 35°C - enables field-deployed automotive ECUs to maintain calibration without periodic recalibration. |
| Bidirectional output current | Sinks 5 mA while regulating - supports negative-reference configurations and active biasing of current-sense amplifiers. |
| Low dropout at full load | 250 mV max at 10 mA - allows use with low-headroom supplies such as post-LDO 5 V rails in ADAS domain controllers. |
Applications
| Automotive Front Camera | Driver Monitoring System |
|---|---|
Use Scenario: High-resolution image sensor biasing and ADC reference in compact camera modules mounted behind rearview mirrors. IC Role / Device Role / Timing Role: Precision 5.0 V reference for 12–14 bit column-parallel ADCs and analog signal conditioning. Use Value: 15 ppm/°C tempco and 3.3 ppmP-P noise ensure consistent exposure linearity across −40°C cold soak to 85°C cabin heat. |
Use Scenario: Powering infrared LED drivers and analog front-end for driver drowsiness detection via facial IR imaging. IC Role / Device Role / Timing Role: Stable 5.0 V supply for precision current sources and low-noise transimpedance amplifiers. Use Value: 650 nA quiescent current extends battery backup runtime during vehicle sleep mode without compromising IR LED accuracy. |
| Battery Control Unit | Electric Power Steering |
Use Scenario: Cell voltage monitoring reference in 12S–16S lithium-ion BMS modules where layout area and self-heating are constrained. IC Role / Device Role / Timing Role: Primary reference for multi-channel delta-sigma ADCs measuring individual cell voltages with <1 mV error. Use Value: Dual-GND pin structure and 59.6 °C/W RθJB minimize thermal coupling between REF35500QDBVRQ1 and adjacent MOSFETs. |
Use Scenario: Reference for torque sensor signal conditioning and motor phase current sensing in EPS control units. IC Role / Device Role / Timing Role: Low-drift 5.0 V source for instrumentation amplifiers and isolated sigma-delta modulators. Use Value: 30 ppm long-term stability ensures torque offset drift remains within ASIL-B diagnostic limits over 15-year vehicle lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3450QDBVRQ1 | Higher quiescent current (3.5 µA typ), no NR pin, same 5.0 V output and ±0.05 % accuracy. | Lacks noise-reduction capability; less suitable for ultra-low-noise sensor front-ends. | Select REF3450QDBVRQ1 only if board space allows larger decoupling and noise budget permits ~2× higher 1/f noise. |
| ADR4550BRZ | Higher initial accuracy (±0.02 %), 2.5 ppm/°C tempco, but 495 µA IQ, SOIC-8 package, non-automotive qualified. | Not AEC-Q100 qualified; unsuitable for under-hood or safety-critical automotive deployment. | Choose ADR4550BRZ only for industrial test equipment where ultra-low drift outweighs power and qualification constraints. |
Compared with REF3450QDBVRQ1 and ADR4550BRZ, REF35500QDBVRQ1 uniquely balances automotive qualification, nanopower operation, and user-adjustable noise performance - making it the only option among the three qualified for front-camera and EPS applications requiring <1 µA standby current and <4 ppmP-P noise.
Availability
REF35500QDBVRQ1 is available at Aetrix Electronics and suitable for automotive ADAS modules, battery management systems, and electric power steering ECUs requiring stable component supply with AEC-Q100 compliance and long-lifecycle support.
Supply support for REF35500QDBVRQ1 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 IC development and manufacturing expertise.
The REF35-Q1 product line was designed specifically for ultra-low-power, high-accuracy voltage referencing in automotive safety-critical systems - targeting front cameras, driver monitoring, and battery control units operating across extended temperature ranges.
FAQ
What is the maximum input voltage for REF35500QDBVRQ1?
The absolute maximum input voltage for REF35500QDBVRQ1 is 6.5 V, but the recommended operating range is VREF + VDO to 6 V - i.e., 5.25 V to 6 V for the 5.0 V output version. Exceeding 6 V risks permanent damage per SNAS845 Section 7.1, and operation above 6 V violates recommended conditions even if below absolute maximum ratings.
Does REF35500QDBVRQ1 require an external capacitor on the NR pin?
No, REF35500QDBVRQ1 operates fully functional with the NR pin left open. However, connecting a 1 µF–10 µF capacitor from NR to GND reduces 0.1–10 Hz output noise by up to 50%, as validated in Figure 8-10 of the SNAS845 datasheet - making it essential for sub-16-bit noise-sensitive applications.
Can REF35500QDBVRQ1 sink current, and how much?
Yes, REF35500QDBVRQ1 can sink up to 5 mA while maintaining regulation. Its bidirectional output supports both sourcing (up to 10 mA) and sinking (up to 5 mA), enabling use in active bias networks and negative-reference topologies - confirmed in Section 1, Features and Section 7.5 Electrical Characteristics of SNAS845.
Is REF35500QDBVRQ1 pin-compatible with other REF35-Q1 variants?
Yes, all REF35-Q1 family members - including REF35500QDBVRQ1, REF35250QDBVRQ1, and REF35330QDBVRQ1 - share identical 6-pin SOT-23 (DBV) packaging and pinout. Voltage selection is internal; no external resistor network or configuration is required for drop-in replacement across output voltage variants.
What is the thermal resistance of REF35500QDBVRQ1 in its SOT-23 package?
REF35500QDBVRQ1 in the DBV (SOT-23-6) package has a junction-to-board thermal resistance (RθJB) of 59.6 °C/W and junction-to-ambient (RθJA) of 164.4 °C/W, per Section 7.4 Thermal Information in SNAS845. These values assume standard JEDEC 2-layer board construction and define safe power dissipation limits under automotive ambient conditions.
REF35500QDBVRQ1 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:
- 15ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3.8ppmp-p
- Noise - 10Hz to 10kHz:
- 0.7ppmrms
- Voltage - Input:
- 5.25V ~ 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
REF35500QDBVRQ1 FAQ
1.How can I place an order for REF35500QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF35500QDBVRQ1 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 REF35500QDBVRQ1 reliable?
The price and inventory of REF35500QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF35500QDBVRQ1 is usually 5 days.
3.What payment methods are accepted for REF35500QDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF35500QDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF35500QDBVRQ1?
REF35500QDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF35500QDBVRQ1 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 REF35500QDBVRQ1?
For technical support, including REF35500QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF35500QDBVRQ1 requirements.
6.How does Aetrix verify that REF35500QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All REF35500QDBVRQ1 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 REF35500QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of REF35500QDBVRQ1?
All REF35500QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF35500QDBVRQ1, 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 REF35500QDBVRQ1 part is unused and in its original packaging.
Return procedure for REF35500QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF35500QDBVRQ1 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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