My Inquiry
My Account
Texas Instruments REF3112AQDBZRQ1
- Part No.:
- REF3112AQDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF3112AQDBZRQ1.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,383
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
REF3112AQDBZRQ1 from Texas Instruments is an AEC-Q100 qualified, 1.25V precision series voltage reference IC for automotive analog signal conditioning. It delivers ±0.2% initial accuracy, 15ppm/°C max drift over –40°C to +125°C, and ±10mA output current in a 3-pin SOT-23 package-enabling high-accuracy ADC biasing in battery management systems.
For engineers reviewing the REF3112AQDBZRQ1 datasheet, REF3112AQDBZRQ1 pinout, REF3112AQDBZRQ1 application, or REF3112AQDBZRQ1 equivalent, key selection criteria include its 115µA max quiescent current, 5mV dropout, no-output-capacitor operation, and functional safety documentation support for ASIL-B–aligned designs.
Technical Context
The REF3112AQDBZRQ1 implements a CMOS bandgap topology with curvature compensation to achieve low temperature drift. Its output voltage is derived from the sum of a PTAT (proportional-to-absolute-temperature) voltage across R1 and the CTAT (complementary-to-absolute-temperature) VBE of Q2, yielding stable 1.25V output across automotive temperature extremes.
It operates as a series reference with active pass element, supporting both sourcing and sinking up to ±10mA while maintaining regulation down to 5mV headroom above VOUT. Thermal hysteresis is specified at 100ppm (first cycle), and long-term stability is 70ppm over 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25V ±0.2% - enables direct interface with 12-bit+ SAR/ΔΣ ADCs requiring precise 1.25V reference |
| Initial Accuracy | ±0.2% - eliminates need for system-level calibration in BMS voltage monitoring paths |
| Temp Drift (–40°C to +125°C) | 15ppm/°C max - ensures ≤1.88mV total drift over full automotive range, critical for EV battery cell sensing |
| Quiescent Current | 115µA max - supports >10-year battery life in always-on vehicle subsystems |
| Dropout Voltage | 5mV min - allows operation from 1.8V supply in low-voltage microcontroller domains |
| Output Current | ±10mA - drives ADC reference inputs, op-amp bias networks, and small DAC loads without external buffering |
| Output Noise (0.1–10Hz) | 17µVPP - meets SNR requirements for 16-bit data acquisition in radar front-ends |
Pinout & Package
REF3112AQDBZRQ1 uses the DBZ (SOT-23) package: 2.92mm × 2.37mm, 3-pin surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply voltage | Accepts 1.8V to 5.5V input; minimum 5mV headroom required for regulation under no load |
| 2 (OUT) | Reference output voltage | Provides stable 1.25V ±0.2%; sinks or sources up to ±10mA; no output capacitor required |
| 3 (GND) | Ground reference | Common return for input and output; must connect to low-impedance analog ground plane per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2kV / CDM ±1kV ESD robustness |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage guidance for ISO 26262 ASIL-B integration |
| No output capacitor requirement | Reduces BOM count and PCB area; eliminates capacitor aging and ESR-related drift in long-life automotive modules |
| Low 17µVPP noise (0.1–10Hz) | Enables <70dB SNR in 16-bit ADC applications without external filtering, simplifying sensor front-end design |
| 100ppm thermal hysteresis (first cycle) | Ensures repeatable voltage accuracy after thermal cycling in engine bay or powertrain environments |
Applications
| Automotive Battery Management System | EV Inverter Current Sensing |
|---|---|
Use Scenario: Monitoring individual Li-ion cell voltages in 400V traction battery packs. IC Role / Device Role / Timing Role: Provides 1.25V reference for 16-bit SAR ADCs sampling cell voltage via precision resistor dividers. Use Value: ±0.2% accuracy and 15ppm/°C drift ensure ≤1.5mV measurement error across –40°C to +85°C operating range, meeting ASIL-C voltage monitoring requirements. |
Use Scenario: Biasing shunt-based current sense amplifiers in 3-phase motor control inverters. IC Role / Device Role / Timing Role: Supplies stable 1.25V reference to zero-drift op-amps measuring mΩ-shunt voltage drops. Use Value: 115µA quiescent current minimizes self-heating error; ±10mA drive capability supports multiple parallel sense channels without gain error. |
| Radar Front-End Signal Conditioning | ADAS Camera Power Supply Reference |
Use Scenario: Level-shifting and attenuating bipolar IF signals in 77GHz radar receivers before digitization. IC Role / Device Role / Timing Role: Generates precision 1.25V reference and regulated 3.0V supply for op-amp signal chains feeding ADCs. Use Value: 17µVPP low-frequency noise prevents baseline wander in slow-scan radar processing; no-output-capacitor operation avoids phase lag in fast transient response. |
Use Scenario: Providing reference voltage for image sensor ADCs and LDO feedback networks in surround-view camera ECUs. IC Role / Device Role / Timing Role: Delivers 1.25V reference to CIS ADCs and supplies bias to low-noise LDOs powering pixel arrays. Use Value: AEC-Q100 qualification ensures reliability in high-temperature cabin environments; 5mV dropout enables use with 1.8V domain supplies, reducing thermal stress on PMICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3412RTET | Higher accuracy (±0.05%), lower drift (3ppm/°C), but 250µA IQ and 6-pin WSON package | Better suited for lab-grade instrumentation; not AEC-Q100 qualified | Select when metrology-grade stability is required and automotive qualification is unnecessary |
| MAX6029AESA+ | Same 1.25V output and SOT-23 package, but ±0.5% accuracy and 50ppm/°C drift; no AEC-Q100 rating | Targeted at industrial/commercial portable equipment, not automotive safety-critical systems | Choose only for cost-sensitive non-automotive designs where 15ppm/°C drift is acceptable |
Compared with REF3112AQDBZRQ1, REF3412RTET offers superior precision at higher power and cost, while MAX6029AESA+ provides basic functionality without automotive qualification-making REF3112AQDBZRQ1 the optimal balance of AEC-Q100 compliance, low drift, and ultra-low IQ for EV/ADAS signal chains.
Availability
REF3112AQDBZRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, EV inverter controls, ADAS radar front-ends, and infotainment MCU reference supply applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for REF3112AQDBZRQ1 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 specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management solutions.
The REF31xx-Q1 product line was designed specifically for high-reliability automotive applications demanding AEC-Q100 qualification, functional safety support, and precision voltage references across –40°C to +125°C.
FAQ
What is the minimum supply voltage required for stable operation of REF3112AQDBZRQ1?
The REF3112AQDBZRQ1 requires a minimum input voltage of 1.8V-5mV above its 1.25V output voltage plus 545mV headroom-to maintain regulation across temperature and load. This is explicitly specified in Section 6.3 of the datasheet and differs from other REF31xx-Q1 variants that support lower dropout.
Does REF3112AQDBZRQ1 require an output capacitor for stability?
No, REF3112AQDBZRQ1 does not require an output capacitor for stability. The device is internally compensated and remains stable with capacitive loads up to 10µF, as confirmed in Section 8.1 and Figure 8-1 of the datasheet. Adding one is optional and may reduce high-frequency noise.
How is the 15ppm/°C maximum temperature drift of REF3112AQDBZRQ1 measured?
The 15ppm/°C maximum drift for REF3112AQDBZRQ1 is measured using the box method over the full –40°C to +125°C range, as defined in Equation 2 of Section 7.3.3. This value represents the worst-case slope of the output voltage vs. temperature curve across all production units.
Is REF3112AQDBZRQ1 compatible with force-and-sense load regulation configurations?
Yes, REF3112AQDBZRQ1 supports force-and-sense connections for accurate load regulation measurement, as detailed in Figure 7-4 and Section 7.3.6. This configuration isolates trace resistance effects and enables true characterization of the device's 10–30µV/mA load regulation performance.
What functional safety documentation is available for REF3112AQDBZRQ1?
Texas Instruments provides functional safety documentation for REF3112AQDBZRQ1 including FIT rate data, failure mode effect analysis (FMEA), and diagnostic coverage guidance-specifically intended to support ISO 26262 ASIL-B system-level certification, as stated in Section 1 Features and Section 9 Device Support.
REF3112AQDBZRQ1 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):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 17µVp-p
- Noise - 10Hz to 10kHz:
- 24µVrms
- Voltage - Input:
- 1.8V ~ 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
REF3112AQDBZRQ1 FAQ
1.How can I place an order for REF3112AQDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3112AQDBZRQ1 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 REF3112AQDBZRQ1 reliable?
The price and inventory of REF3112AQDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3112AQDBZRQ1 is usually 5 days.
3.What payment methods are accepted for REF3112AQDBZRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3112AQDBZRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3112AQDBZRQ1?
REF3112AQDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3112AQDBZRQ1 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 REF3112AQDBZRQ1?
For technical support, including REF3112AQDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3112AQDBZRQ1 requirements.
6.How does Aetrix verify that REF3112AQDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All REF3112AQDBZRQ1 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 REF3112AQDBZRQ1 meets industry standards.
7.What is the process for return or replacement of REF3112AQDBZRQ1?
All REF3112AQDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF3112AQDBZRQ1, 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 REF3112AQDBZRQ1 part is unused and in its original packaging.
Return procedure for REF3112AQDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3112AQDBZRQ1 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…
