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Texas Instruments REF3440QDGKRQ1
- Part No.:
- REF3440QDGKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
REF3440QDGKRQ1.pdf
- Description:
- IC VREF SERIES 0.05% 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
REF3440QDGKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified, low-drift (6 ppm/°C max), low-power (95 µA max) CMOS voltage reference delivering 4.096 V output with ±0.05% initial accuracy and ±10 mA output current capability. It features enable-controlled shutdown (3 µA max), 3.8 µVPP/V low-frequency noise, and is designed for precision analog signal chains in automotive battery management and traction inverters.
For engineers reviewing the REF3440QDGKRQ1 datasheet, REF3440QDGKRQ1 pinout, REF3440QDGKRQ1 application, or REF3440QDGKRQ1 equivalent, key selection criteria include its 4.096 V output voltage, 6 ppm/°C temperature coefficient, 3 µA shutdown current, force-sense output architecture, and VSSOP-8 (DGK) package compatibility with high-reliability automotive systems.
Technical Context
The REF3440QDGKRQ1 implements a precision bandgap core with buffered force-sense output topology to minimize load regulation error and thermal hysteresis. Its enable pin controls active/shutdown modes, reducing quiescent current from 95 µA to 3 µA while placing the output in high-impedance state.
It operates across −40°C to +125°C with 12 V maximum input voltage and supports stable operation with 0.1–10 µF output capacitance. Load regulation sinking performance is specified at 98 ppm/mA for REF3440-Q1, reflecting its optimized design for bidirectional current delivery in ADC reference and sensor biasing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V - precisely matches 12-bit full-scale ADC reference scaling (e.g., 4096 LSB = 4.096 V). |
| Initial Accuracy | ±0.05% - enables <1 LSB error in 12-bit systems without calibration. |
| Temp Coefficient | 6 ppm/°C max - ensures ≤0.75 mV drift over −40°C to +125°C ambient range. |
| Quiescent Current | 95 µA max - allows >10-year battery life in always-on automotive monitoring nodes. |
| Shutdown Current | 3 µA max - reduces system standby power by >96% vs active mode. |
| Low-Freq Noise | 3.8 µVPP/V (0.1–10 Hz) - preserves SNR in high-resolution data acquisition (e.g., ADS7828-Q1). |
| Long-Term Stability | 17 ppm/1000 hrs (DGK package) - minimizes calibration interval requirements in safety-critical BMS. |
Pinout & Package
VSSOP-8 (DGK) package: 4.00 mm × 4.00 mm body, 0.65 mm pitch, exposed thermal pad (not electrically connected). Designed for automotive PCB reliability with AEC-Q100 qualification and solder heat shift < ±0.01%.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: GND_F | Ground force connection | Low-impedance return path for output current; separates force/sense grounds to eliminate PCB trace IR drop errors. |
| 2: GND_S | Ground sense connection | Sense node for internal feedback; rejects ground noise up to 100 mV between GND_F and GND_S. |
| 3: ENABLE | Enable control input | Active-high logic: ≥1.6 V enables output; ≤0.5 V disables output and reduces IQ to 3 µA. |
| 4: IN | Input supply voltage | Accepts 4.146–12 V; dropout voltage ≤100 mV at zero load ensures operation with low-headroom supplies. |
| 5: NIC | No internal connection | Unbonded die pad; must be left floating or tied to GND per layout guidelines to avoid parasitic coupling. |
| 6: OUT_S | Output sense connection | Feedback node for output buffer; enables Kelvin sensing to reject trace resistance effects on reference accuracy. |
| 7: OUT_F | Output force connection | Main output drive terminal; delivers ±10 mA while maintaining 4.096 V within 98 ppm/mA load regulation. |
| 8: NIC | No internal connection | Unbonded die pad; same handling as Pin 5 - no electrical function, requires proper PCB routing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 | Qualified for −40°C to +125°C ambient operation with HBM ±2500 V / CDM ±1500 V ESD robustness. |
| Force-Sense Output Architecture | Separates OUT_F (drive) and OUT_S (feedback) pins to maintain 4.096 V accuracy despite PCB trace resistance up to 100 mΩ. |
| Low Thermal Hysteresis | 20 ppm (Cycle 1) / 10 ppm (Cycle 2) for DGK package - ensures repeatable voltage after thermal cycling in engine bay environments. |
| Stable with Ceramic Capacitors | Operates reliably with 0.1–10 µF X7R/X5R ceramic output caps - eliminates need for costly tantalum or electrolytic types. |
| Ultra-Low 1/f Noise | 3.8 µVPP/V (0.1–10 Hz) - directly improves effective resolution of 16-bit+ SAR ADCs like ADS112U04-Q1. |
Applications
| Battery Management Systems | Traction Inverters |
|---|---|
|
Use Scenario: High-accuracy cell voltage monitoring in 400 V EV battery packs under wide temperature and vibration conditions. IC Role / Device Role / Timing Role: Primary 4.096 V reference for isolated delta-sigma ADCs (e.g., AMC1306M25-Q1) measuring individual cell voltages. Use Value: ±0.05% initial accuracy and 6 ppm/°C drift ensure <±1 mV absolute error over lifetime, meeting ISO 26262 ASIL-C voltage measurement requirements. |
Use Scenario: DC-link voltage sensing and IGBT gate driver biasing in 800 V SiC-based traction inverters. IC Role / Device Role / Timing Role: Stable reference for isolated voltage transducers and auxiliary power supply feedback loops. Use Value: Force-sense architecture rejects PCB trace heating effects during high-current switching, maintaining reference integrity during 10 kHz PWM bursts. |
| Advanced Driver Assistance Systems | On-Board Chargers |
|
Use Scenario: Radar front-end power supply monitoring and RF signal chain calibration in 77 GHz ADAS modules. IC Role / Device Role / Timing Role: Low-noise reference for high-speed ADCs (e.g., ADS4149-Q1) digitizing IF signals in FMCW radar receivers. Use Value: 3.8 µVPP/V 0.1–10 Hz noise prevents spurious tones from degrading radar range resolution below 1 cm. |
Use Scenario: Precision voltage sensing in bi-directional AC/DC converters for 11 kW OBCs with active PFC and LLC stages. IC Role / Device Role / Timing Role: Reference for isolated voltage sensors and microcontroller ADCs performing real-time grid synchronization and efficiency optimization. Use Value: 17 ppm/1000 hrs long-term stability reduces recalibration frequency in field-deployed chargers, lowering service cost over 10-year lifespan. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3440QDBVRQ1 | Same 4.096 V output and specs, but in 6-pin SOT-23 (DBV) package with GND_F/GND_S/EN/IN/OUT_S/OUT_F pinout. | Lacks NIC pins; smaller footprint (2.9 × 1.6 mm) but higher thermal resistance (122.6°C/W vs 174.1°C/W). | Select for space-constrained modules where thermal margin >20°C is available and force-sense routing fits 0.95 mm pitch. |
| MAX6070BAUT41+ | 4.096 V, ±0.04% initial accuracy, 3 ppm/°C drift, but no enable pin and only single-output (no force/sense). | Higher accuracy and lower drift, yet lacks shutdown mode and Kelvin sensing - unsuitable for dynamic power management or noisy PCB layouts. | Select when ultimate drift performance is critical and system power budget permits continuous operation without sleep states. |
Compared with REF3440QDGKRQ1, REF3440QDBVRQ1 offers identical electrical performance in a smaller package but reduced thermal capability, while MAX6070BAUT41+ trades enable functionality and force-sense architecture for tighter drift - making REF3440QDGKRQ1 optimal for automotive systems requiring both precision and intelligent power control.
Availability
REF3440QDGKRQ1 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, advanced driver assistance systems, and on-board chargers requiring stable component supply across automotive production lifecycles.
Supply support for REF3440QDGKRQ1 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-grade precision analog ICs and AEC-Q100 qualified products.
The REF34-Q1 product line is engineered specifically for automotive subsystems demanding high accuracy, low drift, and robust operation across −40°C to +125°C - targeting battery monitoring, motor control, ADAS sensing, and charging infrastructure.
FAQ
What is the maximum input voltage for REF3440QDGKRQ1?
The REF3440QDGKRQ1 supports a maximum input voltage of 12 V, with minimum input defined as VOUT + VDO (50 mV typical at zero load). This 12 V rating enables direct connection to standard automotive 12 V rails without external regulators, simplifying power architecture in body control modules and infotainment systems using REF3440QDGKRQ1.
Does REF3440QDGKRQ1 support force-sense output configuration?
Yes, REF3440QDGKRQ1 implements a true force-sense output architecture with separate OUT_F (force) and OUT_S (sense) pins, plus dedicated GND_F and GND_S terminals. This allows compensation for PCB trace resistance and voltage drop, maintaining 4.096 V accuracy at the load even with 100 mΩ path impedance - a key advantage of REF3440QDGKRQ1 in high-current automotive PCBs.
What is the thermal hysteresis performance of REF3440QDGKRQ1?
The REF3440QDGKRQ1 in DGK package exhibits 20 ppm thermal hysteresis (Cycle 1) and 10 ppm (Cycle 2) after temperature cycling from −40°C to +125°C and back to 25°C. This low hysteresis ensures repeatable 4.096 V output in engine compartment applications subject to repeated thermal stress, a verified specification of REF3440QDGKRQ1 per TI SBAS901C characterization data.
Can REF3440QDGKRQ1 operate with ceramic output capacitors?
Yes, REF3440QDGKRQ1 is stable with ceramic output capacitors ranging from 0.1 µF to 10 µF, including common X7R and X5R dielectrics. This eliminates reliance on polarized capacitors and simplifies layout - a confirmed design feature of REF3440QDGKRQ1 validated across temperature and load conditions in the official datasheet.
What is the long-term stability of REF3440QDGKRQ1 over 1000 hours?
The REF3440QDGKRQ1 in DGK package demonstrates 17 ppm typical long-term stability over 1000 hours at 35°C, measured per JEDEC JESD22-A117. This value is lower than the 25 ppm specified for the DBV package, confirming REF3440QDGKRQ1's enhanced aging performance due to VSSOP packaging and die-level construction.
REF3440QDGKRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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:
- ±0.05%
- 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:
- 8-VSSOP
REF3440QDGKRQ1 FAQ
1.How can I place an order for REF3440QDGKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3440QDGKRQ1 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 REF3440QDGKRQ1 reliable?
The price and inventory of REF3440QDGKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3440QDGKRQ1 is usually 5 days.
3.What payment methods are accepted for REF3440QDGKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3440QDGKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3440QDGKRQ1?
REF3440QDGKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3440QDGKRQ1 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 REF3440QDGKRQ1?
For technical support, including REF3440QDGKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3440QDGKRQ1 requirements.
6.How does Aetrix verify that REF3440QDGKRQ1 is sourced from the original manufacturer or authorized distributors?
All REF3440QDGKRQ1 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 REF3440QDGKRQ1 meets industry standards.
7.What is the process for return or replacement of REF3440QDGKRQ1?
All REF3440QDGKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF3440QDGKRQ1, 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 REF3440QDGKRQ1 part is unused and in its original packaging.
Return procedure for REF3440QDGKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3440QDGKRQ1 Tags
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