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Texas Instruments REF3433SQDBVRQ1
- Part No.:
- REF3433SQDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
REF3433SQDBVRQ1.pdf
- Description:
- IC VREF SERIES 0.05% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:433
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Product details
Overview
REF3433SQDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to +125°C) precision CMOS voltage reference delivering 3.3 V output with ±0.05% initial accuracy, 6 ppm/°C max temperature coefficient, 95 μA max quiescent current, and 3.8 µVPP/V low-frequency noise - used as a stable reference for high-resolution ADCs in automotive battery management and ADAS sensor signal chains.
For engineers reviewing the REF3433SQDBVRQ1 datasheet, REF3433SQDBVRQ1 pinout, REF3433SQDBVRQ1 application, or REF3433SQDBVRQ1 equivalent, this page delivers verified technical context, package-specific pin functions, real-world automotive use cases, and validated alternative options - all grounded in TI's SBAS901C production data sheet.
Technical Context
The REF3433SQDBVRQ1 implements a precision bandgap core with dual-output force/sense architecture (OUT_F/OUT_S) and dedicated ground sense (GND_S) to minimize PCB trace resistance errors. Its enable-controlled shutdown mode reduces current to ≤3 μA while maintaining high-impedance output.
It operates across 3.35 V to 12 V input range with 50 mV typical dropout at zero load, supports ±10 mA sourcing/sinking, and achieves 25 ppm/1000 hrs long-term stability in its SOT-23-6 (DBV) package - meeting stringent requirements for automotive body control modules and traction inverter feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal - precisely sets full-scale reference for 12–16-bit automotive ADCs like ADS7828-Q1. |
| Initial Accuracy | ±0.05% max - enables <1 LSB error in 16-bit systems without calibration. |
| Temp Coefficient | 6 ppm/°C max - ensures <±0.8 mV drift over −40°C to +125°C ambient. |
| Quiescent Current | 95 μA max - allows continuous operation in always-on vehicle subsystems with minimal battery drain. |
| Noise (0.1–10 Hz) | 3.8 µVPP/V - maintains SNR >100 dB for precision current sensing in BMS shunt monitors. |
| Load Current | ±10 mA - drives multiple ADC reference inputs or op-amp bias networks without external buffering. |
| Shutdown Current | 3 μA max - supports deep-sleep modes in ADAS ECUs during vehicle ignition-off states. |
Pinout & Package
SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND_F | Ground force | Primary return path for output current - connects directly to power ground plane under device. |
| GND_S | Ground sense | High-impedance sense node for Kelvin ground measurement - minimizes voltage drop error from PCB trace resistance. |
| EN | Enable input | Active-high logic control: ≥1.6 V enables reference; ≤0.5 V places device in 3 μA shutdown mode. |
| OUT_F | Output force | Main reference output - delivers regulated 3.3 V to load; requires local decoupling capacitor. |
| IN | Input supply | Accepts 3.35 V to 12 V - supports direct connection to 5 V or 12 V automotive rails with 50 mV dropout. |
| OUT_S | Output sense | Feedback node for internal amplifier - connects to high-impedance ADC VREF+ input to reject trace IR drop. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation, HBM ±2500 V, CDM ±1500 V - suitable for under-hood and powertrain applications. |
| Dual-output force/sense topology | Separates high-current OUT_F and precision-sense OUT_S/GND_S paths - eliminates PCB trace resistance impact on reference accuracy. |
| Low 1/f noise | 3.8 µVPP/V (0.1–10 Hz) - preserves dynamic range in slow-sampling battery cell voltage monitoring. |
| Thermal hysteresis control | 30 ppm max (Cycle 1), 10 ppm max (Cycle 2) - ensures repeatable voltage after thermal cycling in ADAS camera modules. |
| Stable capacitive loading | 0.1–10 µF output capacitance range - accommodates ceramic or tantalum bulk decoupling without oscillation risk. |
Applications
| Body Control Module | Battery Management System |
|---|---|
Use Scenario: Monitoring door latch position, window motor current, and interior lighting via 12-bit SAR ADCs. IC Role / Device Role / Timing Role: Provides stable 3.3 V reference for ADC conversion of analog sensor signals. Use Value: Enables <±1 LSB linearity over full automotive temperature range without recalibration. |
Use Scenario: Measuring individual Li-ion cell voltages (±1 mV accuracy required) in EV traction battery packs. IC Role / Device Role / Timing Role: Supplies precision reference to isolated delta-sigma ADCs (e.g., AMC1306-Q1) in cell monitor ICs. Use Value: Supports ISO 26262 ASIL-B compliance by limiting voltage drift to <±0.8 mV across −40°C to +125°C. |
| On-Board Charger | Advanced Driver Assistance Systems |
Use Scenario: Sensing AC input voltage, DC link voltage, and IGBT gate drive levels in bidirectional OBC power stages. IC Role / Device Role / Timing Role: Reference source for voltage scaling and fault detection comparators in digital power controllers. Use Value: Ensures consistent overvoltage trip thresholds across lifetime and temperature - critical for functional safety. |
Use Scenario: Providing reference voltage to radar front-end ADCs (e.g., AWR2944-Q1) and camera ISP analog signal chains. IC Role / Device Role / Timing Role: Low-noise 3.3 V reference for high-SNR RF sampling and image sensor biasing. Use Value: Maintains >90 dB SNR in 77 GHz radar receivers by contributing <0.05% of total system noise floor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3433QDBVRQ1 | Same 3.3 V output and DBV package, but lacks EN pin - fixed-enable only; no shutdown capability. | Not suitable for systems requiring low-power sleep modes; higher standby current (95 μA vs 3 μA). | Select REF3433SQDBVRQ1 when enable-controlled power gating is required for ASIL-B compliant ECU sleep states. |
| MAX6070AASA+T | 3.3 V, ±0.04% initial accuracy, 3 ppm/°C drift, but only −40°C to +105°C rating and no AEC-Q100 qualification. | Limited to cabin electronics; not approved for powertrain or chassis control modules per ISO 26262. | Choose REF3433SQDBVRQ1 for under-hood or safety-critical automotive applications requiring Grade 1 temperature range and AEC-Q100 certification. |
Compared with REF3433QDBVRQ1 and MAX6070AASA+T, REF3433SQDBVRQ1 uniquely combines AEC-Q100 Grade 1 qualification, enable-controlled shutdown, and force/sense outputs - making it the only option qualified for ASIL-B BMS and ADAS reference design requirements.
Availability
REF3433SQDBVRQ1 is available at Aetrix Electronics and suitable for battery management systems, advanced driver assistance systems, and on-board chargers requiring stable component supply across extended automotive temperature ranges and long product lifecycles.
Supply support for REF3433SQDBVRQ1 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 headquartered in Dallas, Texas, designing analog and embedded processing solutions for automotive, industrial, and communications markets.
The REF34-Q1 family was engineered specifically for high-reliability automotive applications - delivering precision voltage references with AEC-Q100 qualification, ultra-low drift, and robust noise performance for safety-critical signal chains.
FAQ
What is the maximum input voltage for REF3433SQDBVRQ1?
The absolute maximum input voltage for REF3433SQDBVRQ1 is 13 V, but the recommended operating maximum is 12 V per TI's SBAS901C datasheet. Exceeding 12 V risks violating the 50–100 mV dropout specification and may increase thermal stress - especially at high ambient temperatures where junction temperature must remain below 150°C.
Does REF3433SQDBVRQ1 support force-sense configuration?
Yes, REF3433SQDBVRQ1 supports true force-sense operation via dedicated OUT_F/OUT_S and GND_F/GND_S pins. This 6-pin SOT-23 layout enables Kelvin sensing to eliminate voltage drop errors from PCB traces - a key differentiator versus standard 3-pin references and essential for <±0.01% system-level accuracy in BMS applications.
What is the typical turn-on time of REF3433SQDBVRQ1?
The typical turn-on time for REF3433SQDBVRQ1 is 2.5 ms (measured to 0.1% of final output settling with CL = 10 µF), as specified in Section 7.5 of the SBAS901C datasheet. This value applies to the REF3425–Q1 variant; REF3433SQDBVRQ1 exhibits comparable behavior due to identical internal architecture and output capacitance dependency.
Is REF3433SQDBVRQ1 qualified for automotive safety standards?
Yes, REF3433SQDBVRQ1 is AEC-Q100 qualified (Grade 1: −40°C to +125°C ambient), with HBM ±2500 V and CDM ±1500 V ESD ratings. It meets foundational requirements for ASIL-B systems per ISO 26262, though final safety case validation remains the responsibility of the system integrator per TI's application note guidance.
Can REF3433SQDBVRQ1 drive a 10 µF output capacitor?
Yes, REF3433SQDBVRQ1 is explicitly characterized for stable operation with output capacitance from 0.1 µF to 10 µF, including ceramic and tantalum types. The 10 µF value is used in TI's typical performance curves (e.g., turn-on time, load transient) and ensures optimal noise filtering and transient response in automotive ADC reference designs.
REF3433SQDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 6ppm/°C
- Noise - 0.1Hz to 10Hz:
- 5µVp-p
- Noise - 10Hz to 10kHz:
- 24µVrms
- Voltage - Input:
- 3.8V ~ 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-23-5
REF3433SQDBVRQ1 FAQ
1.How can I place an order for REF3433SQDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3433SQDBVRQ1 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 REF3433SQDBVRQ1 reliable?
The price and inventory of REF3433SQDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3433SQDBVRQ1 is usually 5 days.
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4.How is shipping managed for REF3433SQDBVRQ1?
REF3433SQDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3433SQDBVRQ1 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 REF3433SQDBVRQ1?
For technical support, including REF3433SQDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3433SQDBVRQ1 requirements.
6.How does Aetrix verify that REF3433SQDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All REF3433SQDBVRQ1 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 REF3433SQDBVRQ1 meets industry standards.
7.What is the process for return or replacement of REF3433SQDBVRQ1?
All REF3433SQDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF3433SQDBVRQ1, 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 REF3433SQDBVRQ1 part is unused and in its original packaging.
Return procedure for REF3433SQDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3433SQDBVRQ1 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
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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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