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Texas Instruments REF3133AQDBZRQ1
- Part No.:
- REF3133AQDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF3133AQDBZRQ1.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:834
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Product details
Overview
REF3133AQDBZRQ1 from Texas Instruments is an AEC-Q100 qualified, precision series voltage reference delivering 3.3 V output with ±0.2% initial accuracy, 15 ppm/°C max drift over –40°C to +125°C, 115 µA max quiescent current, and ±10 mA output drive capability - used in automotive battery management systems and radar signal conditioning circuits.
For engineers reviewing the REF3133AQDBZRQ1 datasheet, REF3133AQDBZRQ1 pinout, REF3133AQDBZRQ1 application, or REF3133AQDBZRQ1 equivalent, this page delivers verified electrical specs, thermal performance data, functional safety documentation status, SOT-23 pin mapping, and validated automotive-grade alternatives for HEV/EV and ADAS designs.
Technical Context
The REF3133AQDBZRQ1 implements a CMOS-based precision bandgap topology with curvature compensation, achieving temperature-invariant output by summing a PTAT voltage across R1 with the CTAT base-emitter voltage of Q2. Its low-dropout architecture enables operation with only 5 mV headroom above 3.3 V output under no-load conditions.
It supports bidirectional 10 mA load current without external capacitors, features 43 µVP-P (0.1–10 Hz) noise at 3.3 V, and maintains 100–135 µA quiescent current across –40°C to +125°C - enabling stable biasing for 16-bit ADCs and isolated sensor interfaces in harsh automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, with ±0.2% initial tolerance (3.2934–3.3066 V) - ensures accurate full-scale reference for 12-/16-bit SAR and ΔΣ ADCs. |
| Temp Drift (–40°C to +125°C) | ≤15 ppm/°C maximum - guarantees ≤±5.5 mV total output variation across full automotive temperature range. |
| Quiescent Current | 115 µA maximum over temperature - enables multi-year battery operation in always-on vehicle subsystems. |
| Dropout Voltage | 5 mV minimum headroom required (unloaded) - allows direct regulation from 3.35 V supplies, minimizing power loss. |
| Output Current | ±10 mA sourcing/sinking - drives ADC reference inputs, op-amp bias networks, and small logic loads without buffering. |
| Low-Frequency Noise | 43 µVP-P (0.1–10 Hz) - meets SNR requirements for high-resolution data acquisition in radar front-ends. |
| ESD Rating | HBM ±2000 V, CDM ±1000 V - satisfies AEC-Q100 H1C/C4A requirements for robustness in automated assembly and field operation. |
Pinout & Package
REF3133AQDBZRQ1 is housed in a 3-pin SOT-23 (DBZ) package measuring 2.92 mm × 2.37 mm, optimized for space-constrained automotive PCBs and thermally efficient mounting on ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply voltage | Accepts 3.35–5.5 V input; minimum 5 mV above VOUT for regulation - must be bypassed with ≥0.47 µF ceramic capacitor. |
| 2 (OUT) | Reference output voltage | Stable 3.3 V source; capable of sourcing/sinking ±10 mA; no load capacitor required - directly interfaces with ADC VREF pins. |
| 3 (GND) | Ground reference | Low-impedance return path; requires solid ground plane connection to minimize thermal hysteresis and EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualification | Rated for –40°C to +125°C ambient, HBM H1C and CDM C4A ESD levels - certified for powertrain and ADAS deployment. |
| Functional safety support | Documentation available for ISO 26262 ASIL-B system integration - includes FIT rate, failure mode analysis, and diagnostic coverage guidance. |
| No output capacitor needed | Stable with 0 µF load capacitance - eliminates BOM cost, board area, and reliability risk from external ceramics in vibration-prone environments. |
| Low thermal hysteresis | ≤100 ppm first-cycle, ≤25 ppm subsequent cycles - preserves calibration integrity after repeated thermal cycling in engine bay applications. |
| High PSRR | ≥60 dB at 100 Hz, >40 dB up to 100 kHz - rejects ripple from switching DC/DC converters powering adjacent MCU or sensor circuitry. |
Applications
| Automotive Battery Management System (BMS) | Radar Signal Conditioning |
|---|---|
Use Scenario: Precision voltage reference for cell voltage monitoring ICs (e.g., TI BQ769x2) in 12S–16S EV battery packs. IC Role / Device Role / Timing Role: Provides stable 3.3 V reference to ADCs measuring ±5 mV differential cell voltages with <10 µV offset error. Use Value: Enables <±1 mV cell voltage accuracy over lifetime, supporting SOC/SOH estimation algorithms compliant with ISO 6469. |
Use Scenario: Reference source for IF-stage amplifiers and ADCs in 77 GHz automotive radar receivers. IC Role / Device Role / Timing Role: Supplies low-noise 3.3 V bias to high-speed comparators and 14-bit ADCs sampling chirp echo signals. Use Value: 43 µVP-P noise and <15 ppm/°C drift maintain <0.05° phase error in beamforming arrays across temperature. |
| Electric Power Steering (EPS) Control Unit | Front Camera Image Signal Processor (ISP) |
Use Scenario: Reference for torque sensor signal conditioning and motor phase current sensing in EPS ECUs. IC Role / Device Role / Timing Role: Delivers 3.3 V reference to sigma-delta modulators digitizing shunt-based current measurements. Use Value: ±10 mA drive and 5 mV dropout enable direct interface with isolated amplifiers, reducing component count vs. LDO+ref solutions. |
Use Scenario: Reference for analog front-end (AFE) and ADCs in ADAS front camera modules processing HDR image data. IC Role / Device Role / Timing Role: Supplies regulated 3.3 V to CCD/CMOS sensor bias circuits and 12-bit image ADCs operating at 60 fps. Use Value: 0.2% initial accuracy and <70 ppm long-term stability ensure consistent white balance and exposure calibration over 10-year vehicle life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6033AASA+ | 3.3 V, ±0.15% initial accuracy, 20 ppm/°C max drift, 65 µA IQ, SO-8 package | Higher accuracy but larger footprint and lower temp range (–40°C to +125°C not AEC-Q100 qualified) | Select for non-automotive industrial data loggers where size is less constrained and AEC-Q100 not required. |
| ADR3433ARJZ-R7 | 3.3 V, ±0.1% initial accuracy, 10 ppm/°C max drift, 120 µA IQ, SOT-23 package, AEC-Q100 Grade 1 | Lower drift and tighter initial tolerance, but higher quiescent current and no functional safety documentation | Prefer for ADAS camera modules needing ultra-low drift, accepting trade-off in power and missing ASIL-B support docs. |
Compared with MAX6033AASA+ and ADR3433ARJZ-R7, REF3133AQDBZRQ1 uniquely combines AEC-Q100 Grade 0 qualification, functional safety documentation, 115 µA max IQ, and no-output-capacitor operation - making it the only choice for space- and power-constrained ASIL-B BMS and radar subsystems.
Availability
REF3133AQDBZRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, radar signal chains, electric power steering control units, and front camera ISP designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for REF3133AQDBZRQ1 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
REF3133AQDBZRQ1 belongs to the REF31xx-Q1 family of AEC-Q100 qualified voltage references engineered specifically for high-accuracy, low-power, and thermally robust operation in automotive powertrain and ADAS subsystems.
FAQ
What is the maximum operating temperature range for REF3133AQDBZRQ1?
The REF3133AQDBZRQ1 is rated for continuous operation from –40°C to +125°C ambient temperature, fully meeting AEC-Q100 Grade 0 requirements. Its electrical characteristics - including output voltage drift, quiescent current, and load regulation - are specified across this full range, enabling use in engine compartment and under-hood applications where thermal stress is extreme.
Does REF3133AQDBZRQ1 require an output capacitor for stability?
No, REF3133AQDBZRQ1 does not require an output capacitor for stability. It is internally compensated and remains stable with 0 µF load capacitance, as confirmed in the datasheet's "No output capacitor required" feature and Figure 8-1 typical connections. This eliminates risk of oscillation due to capacitor aging or ESL in automotive environments.
What is the minimum input voltage needed for REF3133AQDBZRQ1 to regulate at 3.3 V?
The minimum input voltage for REF3133AQDBZRQ1 is VOUT + 5 mV = 3.305 V under no-load conditions. With 10 mA load, dropout increases to ≤50 mV per datasheet Section 6.5, requiring ≥3.35 V supply. This ultra-low dropout enables direct use with tightly regulated 3.35 V DC/DC outputs in modern automotive domains.
Is REF3133AQDBZRQ1 compatible with functional safety standards like ISO 26262?
Yes, REF3133AQDBZRQ1 is functional safety-capable: Texas Instruments provides dedicated documentation - including FIT rate data, failure mode effects analysis (FMEA), and diagnostic coverage guidance - to support ISO 26262 ASIL-B system development. This makes REF3133AQDBZRQ1 suitable for safety-critical BMS and radar applications.
How does the noise performance of REF3133AQDBZRQ1 compare to other 3.3 V automotive references?
REF3133AQDBZRQ1 delivers 43 µVP-P (0.1–10 Hz) noise at 3.3 V output - lower than MAX6033AASA+ (60 µVP-P) and comparable to ADR3433ARJZ-R7 (40 µVP-P). Its noise profile is optimized for high-SNR radar IF stages and precision BMS voltage monitoring, where sub-50 µVP-P is critical to maintain ADC ENOB >14 bits.
REF3133AQDBZRQ1 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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 43µVp-p
- Noise - 10Hz to 10kHz:
- 63µVrms
- Voltage - Input:
- 3.35V ~ 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
REF3133AQDBZRQ1 FAQ
1.How can I place an order for REF3133AQDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3133AQDBZRQ1 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 REF3133AQDBZRQ1 reliable?
The price and inventory of REF3133AQDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3133AQDBZRQ1 is usually 5 days.
3.What payment methods are accepted for REF3133AQDBZRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3133AQDBZRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3133AQDBZRQ1?
REF3133AQDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3133AQDBZRQ1 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 REF3133AQDBZRQ1?
For technical support, including REF3133AQDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3133AQDBZRQ1 requirements.
6.How does Aetrix verify that REF3133AQDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All REF3133AQDBZRQ1 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 REF3133AQDBZRQ1 meets industry standards.
7.What is the process for return or replacement of REF3133AQDBZRQ1?
All REF3133AQDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF3133AQDBZRQ1, 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 REF3133AQDBZRQ1 part is unused and in its original packaging.
Return procedure for REF3133AQDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3133AQDBZRQ1 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
-
AZ431LANTR-G1
Diodes Incorporated
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