My Inquiry
My Account
Texas Instruments REF3440QDBVRQ1
- Part No.:
- REF3440QDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-6
- Datasheet:
-
REF3440QDBVRQ1.pdf
- Description:
- IC VREF SERIES 0.05% SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,731
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
REF3440QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified precision voltage reference delivering 4.096 V output with ±0.05% initial accuracy, 6 ppm/°C max temperature coefficient, and ±10 mA load capability - deployed in high-reliability automotive signal chains such as battery management systems and traction inverters.
For engineers reviewing the REF3440QDBVRQ1 datasheet, REF3440QDBVRQ1 pinout, REF3440QDBVRQ1 application, or REF3440QDBVRQ1 equivalent, this page provides verified package mapping (SOT-23-6 DBV), confirmed enable-controlled shutdown (3 µA), low-noise performance (3.8 µVPP/V), thermal hysteresis data (30 ppm cycle 1), and validated automotive-grade operating range (−40°C to +125°C).
Technical Context
The REF3440QDBVRQ1 implements a CMOS bandgap core with force-sense output architecture (OUT_F/OUT_S) and dedicated ground sense (GND_S) to minimize PCB trace resistance errors. Its enable pin controls active mode (72–95 µA IQ) and shutdown mode (≤3 µA), with logic thresholds referenced to VIN.
It achieves 3.8 µVPP/V (0.1 Hz–10 Hz) noise via internal filtering and low-output-impedance buffering, supporting 16-bit+ ADCs like ADS7828-Q1. Thermal hysteresis is characterized across −40°C → +125°C → 25°C cycles, with 30 ppm (cycle 1) and 10 ppm (cycle 2) for the DBV package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V - precisely matches 12-bit full-scale LSB step for 5-V ADC references and enables direct interface with TI's ADS7828-Q1. |
| Initial Accuracy | ±0.05% max - ensures ≤2 mV absolute error at 25°C, critical for calibration-critical BMS cell voltage monitoring. |
| Temp Coefficient | 6 ppm/°C max - contributes ≤0.8 mV drift over −40°C to +125°C, enabling stable operation in under-hood environments. |
| Quiescent Current | 95 µA max - supports always-on monitoring in low-power EV subsystems without compromising battery life. |
| Shutdown Current | 3 µA max - reduces system standby power by >95% vs active mode, essential for ISO 16750-compliant sleep modes. |
| Low-Frequency Noise | 3.8 µVPP/V (0.1–10 Hz) - maintains SNR >100 dB for 16-bit SAR ADCs in ADAS sensor front-ends. |
| Long-Term Stability | 25 ppm / 1000 hrs - limits calibration drift in battery pack lifetime monitoring without field recalibration. |
Pinout & Package
SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, surface-mount, RoHS-compliant. Designed for high-density automotive PCBs with thermal pad omitted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND_F | Force Ground | Primary return path for output current; connects directly to power ground plane to minimize IR drop in high-current paths. |
| GND_S | Sense Ground | High-impedance reference return; routed separately to analog ground to reject PCB trace resistance errors. |
| EN | Enable Input | Active-high digital control; ≥1.6 V activates device, ≤0.5 V enters shutdown; no external pull-up required. |
| OUT_F | Force Output | Delivers regulated 4.096 V to load; used when precise sourcing is required without sense compensation. |
| IN | Supply Input | Accepts 4.146 V to 12 V input; dropout as low as 50 mV at zero load enables use with low-headroom LDOs. |
| OUT_S | Sense Output | Feedback node for closed-loop regulation; connects to high-impedance ADC reference inputs to eliminate trace loss. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 | Qualified for −40°C to +125°C ambient operation with HBM ±2.5 kV and CDM ±1.5 kV ESD robustness - meets automotive electronics reliability requirements. |
| Force-Sense Output Architecture | Separate OUT_F/OUT_S and GND_F/GND_S terminals enable Kelvin sensing to cancel PCB trace resistance effects up to 100 mΩ. |
| Ultra-Low 1/f Noise | 3.8 µVPP/V (0.1–10 Hz) - preserves dynamic range in high-resolution data acquisition for battery cell voltage monitoring. |
| Thermal Hysteresis Control | 30 ppm (cycle 1), 10 ppm (cycle 2) - ensures repeatable voltage output after thermal cycling in engine bay or powertrain modules. |
| Stable Capacitive Loading | Operates with 0.1 µF to 10 µF output capacitance - compatible with standard ceramic decoupling without oscillation risk. |
Applications
| Body Control Module | On-Board Charger |
|---|---|
Use Scenario: Monitoring 12-V battery health and load-dump transients in vehicle body electronics. IC Role / Device Role / Timing Role: Provides stable 4.096-V reference for microcontroller ADCs measuring battery voltage, interior lighting current, and door actuator feedback. Use Value: ±0.05% accuracy ensures <±5 mV absolute error across temperature, enabling precise state-of-charge estimation without recalibration. |
Use Scenario: Precision voltage sensing of DC-link capacitors and AC input rectified waveforms during EV charging. IC Role / Device Role / Timing Role: Supplies reference to isolated sigma-delta ADCs (e.g., AMC1306-Q1) for current shunt measurement and voltage monitoring. Use Value: 6 ppm/°C drift and 3.8 µVPP/V noise maintain <0.1% measurement linearity over 85°C ambient rise, meeting IEC 61851-23 compliance. |
| Traction Inverter | Battery Management System |
Use Scenario: Real-time phase current sensing and DC-link voltage feedback in 400-V/800-V inverter control loops. IC Role / Device Role / Timing Role: Reference source for dual-channel isolated amplifiers (e.g., AMC1311-Q1) feeding motor control MCU ADCs. Use Value: Force-sense architecture rejects PCB trace resistance up to 100 mΩ, eliminating gain error in high-current PCB layouts. |
Use Scenario: Cell voltage measurement across 96-series Li-ion packs with 1-mV resolution requirement. IC Role / Device Role / Timing Role: Primary reference for 16-bit SAR ADCs (e.g., ADS7951-Q1) in passive balancing BMS controllers. Use Value: 25 ppm/1000 hrs long-term stability limits calibration drift to <0.1 mV over 5-year pack lifetime, reducing service interval frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3440QDGKRQ1 | Same electrical specs but in 8-pin VSSOP (DGK) package; includes NC and NIC pins; higher RθJA (174.1°C/W) vs DBV (122.6°C/W). | Preferred for space-constrained layouts requiring larger thermal relief pads; not suitable for ultra-dense SOT-23 footprints. | Select REF3440QDGKRQ1 when board layout allows larger 4.0 mm × 4.0 mm footprint and thermal management requires lower junction-to-board resistance. |
| MAX6070AUT4096 | 4.096 V output, ±0.04% initial accuracy, 3 ppm/°C drift, but only −40°C to +105°C rating and no AEC-Q100 qualification. | Valid for industrial or commercial automotive-adjacent systems, but not certified for safety-critical powertrain or chassis modules. | Choose MAX6070AUT4096 only for non-safety-critical applications where extended temperature range and automotive qualification are not required. |
Compared with REF3440QDGKRQ1, the REF3440QDBVRQ1 offers superior thermal performance in compact layouts; compared with MAX6070AUT4096, it delivers guaranteed automotive qualification and wider temperature coverage at the cost of slightly higher drift - making it the sole choice for ASIL-B compliant BMS and inverter designs.
Availability
REF3440QDBVRQ1 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, on-board chargers, and advanced driver assistance systems requiring stable component supply across automotive production lifecycles.
Supply support for REF3440QDBVRQ1 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 focused on analog and embedded processing technologies, with leadership in automotive, industrial, and high-reliability analog ICs.
The REF34-Q1 product line is designed specifically for AEC-Q100 Grade 1 automotive applications demanding precision, low drift, and robustness in harsh thermal and ESD environments - including electric powertrain, battery monitoring, and ADAS sensor interfaces.
FAQ
What is the maximum input voltage for REF3440QDBVRQ1?
The REF3440QDBVRQ1 supports an absolute maximum input voltage of 13 V, with recommended operation up to 12 V. Exceeding 13 V risks permanent damage per absolute maximum ratings. The device maintains regulation down to VOUT + VDO (50 mV typical at zero load), enabling use with low-dropout supplies in automotive 12-V systems.
Does REF3440QDBVRQ1 support sinking current?
Yes, REF3440QDBVRQ1 supports bidirectional load current: ±10 mA. When sinking current (e.g., driving a DAC reference input), its load regulation is specified at 60 ppm/mA (max) - a value confirmed in Section 7.5 of the SBAS901C datasheet for the REF3440-Q1 variant.
What is the purpose of the GND_S pin on REF3440QDBVRQ1?
The GND_S (ground sense) pin on REF3440QDBVRQ1 provides a dedicated Kelvin return path for the reference output, isolating the high-impedance sense node from power ground currents. This eliminates voltage error caused by PCB trace resistance between GND_F and the load, ensuring accuracy in precision ADC applications.
How does the EN pin function on REF3440QDBVRQ1?
The EN pin on REF3440QDBVRQ1 is an active-high digital control: ≥1.6 V enables normal operation (IQ ≤95 µA); ≤0.5 V places the device in shutdown mode (IQ ≤3 µA). No external pull-up is required, and the pin tolerates voltages up to VIN, simplifying interface with automotive MCUs.
Is REF3440QDBVRQ1 qualified for automotive safety applications?
Yes, REF3440QDBVRQ1 is AEC-Q100 Grade 1 qualified (−40°C to +125°C ambient), with HBM ±2.5 kV and CDM ±1.5 kV ESD ratings. It is designed for ASIL-B capable systems and widely deployed in battery management, traction inverters, and ADAS - though final safety certification depends on system-level integration and validation.
REF3440QDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SOT-23-6
- Series:
- REF34xx
- 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:
- ±0.05%
- Temperature Coefficient:
- 6ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3.8µVp-p
- Noise - 10Hz to 10kHz:
- 24µVrms
- Voltage - Input:
- 4.596V ~ 12V
- Current - Supply:
- 95µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
REF3440QDBVRQ1 FAQ
1.How can I place an order for REF3440QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3440QDBVRQ1 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 REF3440QDBVRQ1 reliable?
The price and inventory of REF3440QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3440QDBVRQ1 is usually 5 days.
3.What payment methods are accepted for REF3440QDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3440QDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3440QDBVRQ1?
REF3440QDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3440QDBVRQ1 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 REF3440QDBVRQ1?
For technical support, including REF3440QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3440QDBVRQ1 requirements.
6.How does Aetrix verify that REF3440QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All REF3440QDBVRQ1 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 REF3440QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of REF3440QDBVRQ1?
All REF3440QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF3440QDBVRQ1, 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 REF3440QDBVRQ1 part is unused and in its original packaging.
Return procedure for REF3440QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3440QDBVRQ1 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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
