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Texas Instruments REF3120AQDBZRQ1
- Part No.:
- REF3120AQDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF3120AQDBZRQ1.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,418
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Product details
Overview
REF3120AQDBZRQ1 from Texas Instruments is an AEC-Q100 qualified, precision series voltage reference delivering 2.048 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 as a stable reference for automotive ADCs, battery monitoring, and sensor signal conditioning circuits.
For engineers reviewing the REF3120AQDBZRQ1 datasheet, REF3120AQDBZRQ1 pinout, REF3120AQDBZRQ1 application, or REF3120AQDBZRQ1 equivalent, this page provides verified electrical specifications, SOT-23 pin mapping, automotive-grade thermal and ESD performance data, and real-world use cases in HEV/EV powertrain and ADAS subsystems.
Technical Context
The REF3120AQDBZRQ1 implements a CMOS-based precision bandgap topology with curvature compensation, enabling near-zero temperature coefficient output. Its architecture supports sourcing and sinking up to ±10 mA while maintaining low dropout (5 mV min) and high PSRR (>60 dB at 100 Hz).
It operates across –40°C to +125°C without external capacitors, features functional safety documentation support, and meets AEC-Q100 Grade 1 requirements including HBM ±2000 V and CDM ±1000 V ESD ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V ±0.2% - enables precise 12-bit ADC full-scale alignment without trimming |
| Initial Accuracy | ±0.2% - eliminates need for system-level calibration in automotive BMS |
| Temp Drift (–40°C to +125°C) | ≤15 ppm/°C - ensures ≤±2.5 mV total output shift across full automotive temperature range |
| Quiescent Current | 115 µA max - supports always-on battery monitoring with <1 µA standby contribution |
| Dropout Voltage | 5 mV min - allows operation from supply rails as low as VOUT + 5 mV, critical for low-voltage HEV systems |
| Output Current | ±10 mA - drives SAR and ΔΣ ADC references directly without buffer amplifiers |
| Low-Frequency Noise | 27 µVPP (0.1–10 Hz) - maintains SNR >90 dB in 16-bit data acquisition front-ends |
Pinout & Package
REF3120AQDBZRQ1 uses a 3-pin SOT-23 (DBZ) package measuring 2.92 mm × 2.37 mm, optimized for space-constrained automotive PCBs and compatible with standard reflow profiles (MSL Level 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply voltage | Accepts VIN ≥ VOUT + 5 mV; no bypass capacitor required but 0.47 µF ceramic recommended |
| 2 (OUT) | Reference output voltage | Provides stable 2.048 V; capable of sourcing/sinking ±10 mA with <30 µV/mA load regulation |
| 3 (GND) | Ground reference | Single-point connection to solid ground plane; critical for minimizing thermal EMF and noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with HBM ±2000 V and CDM ±1000 V ESD robustness |
| No output capacitor required | Enables ultra-low-power, space-constrained designs such as battery cell monitors and radar sensor nodes |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage guidance for ISO 26262 ASIL-B systems |
| Low thermal hysteresis | ≤100 ppm after first thermal cycle - preserves calibration integrity in cyclic thermal environments |
| High PSRR | ≥65 dB at 100 Hz - rejects ripple from switching DC/DC converters powering ADAS ECUs |
Applications
| Automotive Battery Management System | Electric Power Steering (EPS) Control Unit |
|---|---|
|
Use Scenario: Monitoring individual Li-ion cell voltages in 48V mild-hybrid battery packs with 16-bit ADC resolution. IC Role / Device Role / Timing Role: Provides 2.048 V reference for simultaneous sampling of 12-cell stacks via multiplexed SAR ADCs. Use Value: ±0.2% accuracy and 15 ppm/°C drift ensure <±5 mV total error over lifetime, meeting ASIL-C voltage monitoring requirements. |
Use Scenario: Supplying reference voltage to torque-sensing ADCs and motor phase current sensors in EPS ECU. IC Role / Device Role / Timing Role: Delivers stable 2.048 V reference for dual 16-bit sigma-delta converters sampling at 10 kSPS. Use Value: 27 µVPP low-frequency noise and ±10 mA drive capability eliminate external op-amp buffers, reducing BOM count. |
| Radar Signal Processing Module | Front Camera Image Signal Processor |
|
Use Scenario: Biasing RF front-end components and calibrating ADCs in 77 GHz automotive radar transceivers. IC Role / Device Role / Timing Role: Supplies clean 2.048 V reference to high-speed ADCs digitizing IF signals with 12+ ENOB. Use Value: 65 dB PSRR at 100 Hz suppresses switching noise from radar SoC power domains, preserving dynamic range. |
Use Scenario: Reference source for analog front-end (AFE) ADCs capturing raw image data from CMOS image sensors. IC Role / Device Role / Timing Role: Generates 2.048 V reference for 14-bit column-parallel ADCs operating at 60 fps. Use Value: 115 µA max IQ enables always-on camera wake-up functionality with sub-µA system standby current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3420RTET | Higher accuracy (±0.05%), lower drift (3 ppm/°C), but 2× higher IQ (220 µA) and larger 6-pin WSON package | Better suited for lab-grade instrumentation; less optimal for space/thermal-constrained automotive modules | Choose REF3420RTET only when absolute long-term stability outweighs size and power constraints |
| ADR3420ARMZ | Same 2.048 V output and SOT-23 package, but wider drift spec (20 ppm/°C max) and no AEC-Q100 qualification | Limited to industrial or consumer applications; not certified for automotive safety-critical functions | Select ADR3420ARMZ only for non-automotive designs where cost is prioritized over qualification and drift margin |
Compared with REF3120AQDBZRQ1, REF3420RTET offers superior accuracy at the expense of power and footprint, while ADR3420ARMZ reduces cost but sacrifices automotive qualification and thermal stability - making REF3120AQDBZRQ1 the optimal balance for production HEV/EV systems.
Availability
REF3120AQDBZRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, electric power steering control units, and radar signal processing modules requiring stable component supply under AEC-Q100 compliance and extended temperature operation.
Supply support for REF3120AQDBZRQ1 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 specializing in analog and embedded processing technologies, with decades of automotive IC design expertise and ISO/TS 16949-certified manufacturing.
The REF31xx-Q1 product line was engineered specifically for automotive safety-critical applications, delivering precision voltage references with AEC-Q100 qualification, functional safety documentation, and robust performance across –40°C to +125°C.
FAQ
What is the maximum operating temperature range for REF3120AQDBZRQ1?
The REF3120AQDBZRQ1 is rated for continuous operation from –40°C to +125°C ambient temperature, fully compliant with AEC-Q100 Grade 1 requirements. This range is validated across all electrical parameters including output voltage drift, quiescent current, and load regulation - ensuring reliability in under-hood and powertrain environments where REF3120AQDBZRQ1 is commonly deployed.
Does REF3120AQDBZRQ1 require an output capacitor for stability?
No, REF3120AQDBZRQ1 does not require an output capacitor for stability - a key design advantage confirmed in TI's official datasheet Section 8.1. It remains stable with capacitive loads up to 10 µF, but zero-output-capacitor operation is supported and recommended for ultra-low-power applications like always-on battery monitoring where REF3120AQDBZRQ1 minimizes leakage and board area.
What is the minimum input voltage needed for REF3120AQDBZRQ1 to regulate properly?
The minimum input voltage for REF3120AQDBZRQ1 is VOUT + 5 mV in unloaded conditions, per Section 6.5 of the datasheet. At full ±10 mA load, dropout rises to ≤50 mV (typical 15 mV), meaning REF3120AQDBZRQ1 can operate from supplies as low as 2.063 V at 10 mA sink - enabling direct use with low-headroom 2.2 V or 3.3 V rails common in REF3120AQDBZRQ1-based automotive sensor interfaces.
Is REF3120AQDBZRQ1 pin-compatible with other REF31xx-Q1 variants?
Yes, all REF31xx-Q1 devices - including REF3112AQDBZRQ1, REF3125AQDBZRQ1, and REF3133AQDBZRQ1 - share identical 3-pin SOT-23 (DBZ) pinout (IN, OUT, GND) and package dimensions. This allows drop-in replacement across output voltages without PCB redesign, simplifying BOM consolidation and variant management for REF3120AQDBZRQ1 users scaling across multiple automotive platforms.
How does the functional safety support for REF3120AQDBZRQ1 assist ISO 26262 development?
REF3120AQDBZRQ1 includes dedicated functional safety documentation - such as FIT rate calculations, failure mode effect analysis (FMEA), and diagnostic coverage guidance - enabling system architects to integrate REF3120AQDBZRQ1 into ASIL-B or ASIL-C subsystems with reduced validation effort. This support is explicitly referenced in the device's "Functional Safety-Capable" feature list and documented in TI's safety manual for REF31xx-Q1.
REF3120AQDBZRQ1 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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 27µVp-p
- Noise - 10Hz to 10kHz:
- 39µVrms
- Voltage - Input:
- 2.098V ~ 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
REF3120AQDBZRQ1 FAQ
1.How can I place an order for REF3120AQDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3120AQDBZRQ1 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 REF3120AQDBZRQ1 reliable?
The price and inventory of REF3120AQDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3120AQDBZRQ1 is usually 5 days.
3.What payment methods are accepted for REF3120AQDBZRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3120AQDBZRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3120AQDBZRQ1?
REF3120AQDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3120AQDBZRQ1 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 REF3120AQDBZRQ1?
For technical support, including REF3120AQDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3120AQDBZRQ1 requirements.
6.How does Aetrix verify that REF3120AQDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All REF3120AQDBZRQ1 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 REF3120AQDBZRQ1 meets industry standards.
7.What is the process for return or replacement of REF3120AQDBZRQ1?
All REF3120AQDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF3120AQDBZRQ1, 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 REF3120AQDBZRQ1 part is unused and in its original packaging.
Return procedure for REF3120AQDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3120AQDBZRQ1 Tags
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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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