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Texas Instruments REF3140AQDBZRQ1
- Part No.:
- REF3140AQDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF3140AQDBZRQ1.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,157
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Product details
Overview
REF3140AQDBZRQ1 from Texas Instruments is an AEC-Q100 qualified, precision series voltage reference delivering 4.096 V output with ±0.2% initial accuracy, 15 ppm/°C max drift over –40°C to +125°C, and 115 µA max quiescent current - used in automotive battery management, radar systems, and high-accuracy ADC biasing.
For engineers reviewing the REF3140AQDBZRQ1 datasheet, REF3140AQDBZRQ1 pinout, REF3140AQDBZRQ1 application, or REF3140AQDBZRQ1 equivalent, key selection criteria include its 5 mV dropout, ±10 mA output drive capability, no-output-capacitor operation, and functional safety documentation support for ASIL-B–level system design.
Technical Context
The REF3140AQDBZRQ1 implements a CMOS bandgap topology with curvature compensation, generating a stable 4.096 V reference via temperature-independent summation of PTAT and CTAT voltages. Its low-noise (53 µVP-P, 0.1–10 Hz) and high PSRR (>60 dB up to 10 kHz) enable direct use in 16-bit SAR and delta-sigma data converters without external filtering.
It operates as a three-terminal series reference with input-to-output regulation, supporting sourcing and sinking up to ±10 mA while maintaining <30 µV/mA load regulation. Thermal hysteresis is limited to 100 ppm after one full temperature cycle, and long-term stability is 70 ppm over 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.2% - matches standard 12-bit DAC full-scale and 16-bit ADC reference scaling for LSB-aligned precision. |
| Initial Accuracy | ±0.2% - eliminates need for post-production trimming in automotive sensor signal chains. |
| Temp Drift (–40°C to +125°C) | ≤15 ppm/°C max - ensures ≤±1.25 mV total error across full automotive temperature range. |
| Quiescent Current | 115 µA max - enables continuous operation in always-on vehicle modules with sub-1 µA sleep-state leakage budgets. |
| Dropout Voltage | 5 mV min - allows operation from supplies as low as 4.101 V, critical for post-buck LDO or battery-follower architectures. |
| Output Drive | ±10 mA - supports direct driving of multiple ADC references, op-amp bias networks, and digital isolator VREF inputs. |
| Low-Frequency Noise | 53 µVP-P (0.1–10 Hz) - preserves ENOB >15.5 bits in 16-bit delta-sigma converters at 10 SPS. |
Pinout & Package
REF3140AQDBZRQ1 is housed in a 3-pin SOT-23 (DBZ) package measuring 2.92 mm × 2.37 mm, optimized for space-constrained automotive PCBs and compatible with standard SMT reflow profiles (MSL Level 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply terminal | Accepts 4.101 V to 5.5 V; minimum headroom is 5 mV above VOUT - enables ultra-low-voltage operation in battery-edge scenarios. |
| 2 (OUT) | Reference output terminal | Delivers regulated 4.096 V with ±10 mA bidirectional drive; no external capacitor required for stability. |
| 3 (GND) | Ground reference terminal | Serves as return path for both input and output currents; requires low-impedance connection to solid ground plane to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2 kV / CDM ±1 kV ESD robustness - meets automotive module reliability requirements. |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage guidance - accelerates ISO 26262 ASIL-B hardware compliance. |
| No output capacitor needed | Eliminates 1–10 µF ceramic capacitor and associated board area, BOM cost, and aging-related drift in portable and vibration-prone automotive mounts. |
| Low dropout (5 mV) | Permits integration into power domains where supply margin is constrained - e.g., post-LDO rails feeding isolated CAN transceivers or MCU ADCs. |
| High PSRR (>60 dB @ 1 kHz) | Rejects switching noise from adjacent DC/DC converters, preventing reference modulation that degrades ADC SNR in radar front-ends. |
Applications
| Automotive Battery Management System (BMS) | Radar Signal Processing Unit |
|---|---|
Use Scenario: Precision cell voltage monitoring in 12S–16S EV battery packs using 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Provides stable 4.096 V reference for ADC conversion, enabling ±1 mV cell voltage resolution at 4.2 V full scale. Use Value: Enables accurate state-of-charge estimation within ±0.5% error over lifetime, directly supporting ISO 6469 safety validation. |
Use Scenario: Biasing analog front-end (AFE) stages in 77 GHz automotive radar receivers. IC Role / Device Role / Timing Role: Supplies reference voltage to programmable gain amplifiers (PGAs) and ADC drivers in RF sampling paths. Use Value: Maintains <–100 dBc harmonic distortion and <120 dB SNR by minimizing reference-induced spurs in IF digitization. |
| Electric Power Steering (EPS) Control Module | ADAS Front Camera Image Signal Processor |
Use Scenario: Torque sensor signal conditioning and motor current sensing in ASIL-C EPS ECUs. IC Role / Device Role / Timing Role: Reference source for dual 16-bit sigma-delta ADCs measuring shunt-based phase currents and Hall-effect torque signals. Use Value: Ensures <±0.1° steering angle resolution and <1 ms fault detection latency under thermal stress cycling. |
Use Scenario: Providing reference for analog gamma correction and auto-exposure control circuits in 8 MP front camera ISPs. IC Role / Device Role / Timing Role: Supplies stable bias to CCD/CMOS sensor analog signal chains and ISP ADCs during rapid illumination transitions. Use Value: Prevents reference-induced banding artifacts and maintains dynamic range >120 dB across –40°C to +85°C junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6070BAUT41 | 4.096 V output, ±0.1% initial accuracy, 12 ppm/°C drift, but 65 µA typical IQ and SOT-23-5 package. | Higher accuracy suits metrology-grade calibration tools; extra pins complicate layout in space-constrained automotive modules. | Select when tighter initial tolerance is mandatory and PCB real estate permits 5-pin footprint. |
| ADR3440ARJZ-R7 | 4.096 V output, ±0.1% initial accuracy, 10 ppm/°C drift, 120 µA max IQ, and SOT-23-5 package with enable pin. | Enable functionality supports power-gating in low-duty-cycle ADAS sensors; higher cost and larger footprint than REF3140AQDBZRQ1. | Choose when system-level power sequencing requires active shutdown and thermal drift must be minimized below 10 ppm/°C. |
Compared with MAX6070BAUT41 and ADR3440ARJZ-R7, REF3140AQDBZRQ1 offers optimal balance of AEC-Q100 qualification, minimal board area (3-pin SOT-23), and guaranteed 15 ppm/°C drift - making it the preferred choice for production automotive modules where footprint, qualification, and thermal performance are jointly constrained.
Availability
REF3140AQDBZRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, radar front-ends, and electric power steering control modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for REF3140AQDBZRQ1 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 automotive, industrial, and power management ICs.
REF3140AQDBZRQ1 belongs to the REF31xx-Q1 family of AEC-Q100 qualified voltage references designed specifically for high-reliability automotive subsystems demanding precision, low power, and functional safety readiness.
FAQ
What is the maximum operating temperature range for REF3140AQDBZRQ1?
The REF3140AQDBZRQ1 is rated for continuous operation from –40°C to +125°C ambient temperature, fully qualified per AEC-Q100 Grade 1 standards. This range covers under-hood and transmission-control module environments, and its 15 ppm/°C max drift is specified across this entire interval - not extrapolated.
Does REF3140AQDBZRQ1 require an output capacitor for stability?
No, REF3140AQDBZRQ1 does not require an output capacitor for stability. Its internal design ensures unconditional stability with capacitive loads from 0 pF to ≥10 µF. TI recommends avoiding output capacitors unless needed for specific noise filtering, as they can degrade transient response and increase startup time.
What is the minimum input voltage required for REF3140AQDBZRQ1 to regulate properly?
The minimum input voltage for REF3140AQDBZRQ1 is VOUT + 5 mV = 4.101 V under no-load conditions. Under load, dropout increases linearly - e.g., at ±10 mA, dropout reaches up to 50 mV. This ultra-low dropout enables use in battery-follower and post-LDO configurations where supply headroom is severely limited.
How does REF3140AQDBZRQ1 support functional safety compliance in automotive designs?
REF3140AQDBZRQ1 is functional safety-capable: TI provides documentation including FIT rate calculations, failure mode effect analysis (FMEA), and diagnostic coverage guidance. It supports ASIL-B hardware development per ISO 26262 when integrated with appropriate system-level diagnostics - no additional external safety components are required for basic fault detection.
Can REF3140AQDBZRQ1 sink and source current simultaneously?
No, REF3140AQDBZRQ1 cannot sink and source current simultaneously on the same output node. It operates in either sourcing mode (delivering current to a load referenced to GND) or sinking mode (absorbing current from a load tied to a positive rail). Bidirectional capability means it supports either polarity of load current - not concurrent flow.
REF3140AQDBZRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 53µVp-p
- Noise - 10Hz to 10kHz:
- 78µVrms
- Voltage - Input:
- 4.146V ~ 5.5V
- Current - Supply:
- 135µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
REF3140AQDBZRQ1 FAQ
1.How can I place an order for REF3140AQDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3140AQDBZRQ1 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 REF3140AQDBZRQ1 reliable?
The price and inventory of REF3140AQDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3140AQDBZRQ1 is usually 5 days.
3.What payment methods are accepted for REF3140AQDBZRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3140AQDBZRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3140AQDBZRQ1?
REF3140AQDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3140AQDBZRQ1 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 REF3140AQDBZRQ1?
For technical support, including REF3140AQDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3140AQDBZRQ1 requirements.
6.How does Aetrix verify that REF3140AQDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All REF3140AQDBZRQ1 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 REF3140AQDBZRQ1 meets industry standards.
7.What is the process for return or replacement of REF3140AQDBZRQ1?
All REF3140AQDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF3140AQDBZRQ1, 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 REF3140AQDBZRQ1 part is unused and in its original packaging.
Return procedure for REF3140AQDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3140AQDBZRQ1 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
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AZ431LANTR-G1
Diodes Incorporated
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