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Texas Instruments REF3125AQDBZRQ1
- Part No.:
- REF3125AQDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF3125AQDBZRQ1.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:226
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Product details
Overview
REF3125AQDBZRQ1 from Texas Instruments is an AEC-Q100 qualified, precision 2.5V series voltage reference IC designed for automotive signal conditioning and data acquisition subsystems. It delivers ±0.2% initial accuracy, 15ppm/°C max drift over –40°C to +125°C, 115µA max quiescent current, and ±10mA output drive capability - enabling high-accuracy ADC biasing in HEV/EV battery monitors and ADAS radar front-ends.
For engineers reviewing the REF3125AQDBZRQ1 datasheet, REF3125AQDBZRQ1 pinout, REF3125AQDBZRQ1 application, or REF3125AQDBZRQ1 equivalent, this page provides verified technical context, automotive-grade thermal and ESD specifications, functional safety documentation support, and validated alternative options for precision voltage reference selection in safety-critical automotive systems.
Technical Context
The REF3125AQDBZRQ1 implements a CMOS bandgap topology with curvature-compensated VBE summation, achieving temperature-invariant output via proportional-to-absolute-temperature (PTAT) voltage generation across matched transistors and negative-TC base-emitter voltage offset. Its low-dropout architecture enables operation with only 5mV headroom above 2.5V output under no-load conditions.
It supports bidirectional 10mA load current without external capacitors, features 17µVP-P (0.1–10Hz) noise performance at 2.5V, and maintains 20ppm/°C max drift across the full –40°C to +125°C automotive temperature range - validated per AEC-Q100 Grade 1 requirements including HBM ±2kV and CDM ±1kV ESD ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V ±0.2% (2.495–2.505V) - ensures direct compatibility with 2.5V ADC references and microcontroller analog supply rails. |
| Initial Accuracy | ±0.2% - eliminates need for post-manufacturing trimming in automotive BMS and radar sensor signal chains. |
| Temp Drift (–40°C to +125°C) | ≤20ppm/°C - guarantees ≤±500µV total output variation across full automotive operating range. |
| Quiescent Current | 115µA max - enables multi-year battery life in always-on ADAS modules and portable diagnostic tools. |
| Dropout Voltage | 5mV min (unloaded), ≤50mV (full load) - allows operation from ultra-low-headroom supplies like LDO outputs or partially discharged batteries. |
| Output Current | ±10mA - supports driving multiple ADC references, op-amp bias networks, or small-signal transducers without external buffers. |
| Noise (0.1–10Hz) | 33µVP-P - limits quantization error contribution to <0.05 LSB in 16-bit data acquisition systems. |
Pinout & Package
REF3125AQDBZRQ1 uses the 3-pin SOT-23 (DBZ) package measuring 2.92mm × 2.37mm - 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 2.55V–5.5V input; minimum 5mV above VOUT for regulation - enables use with low-noise LDOs or battery-derived rails. |
| 2 (OUT) | Reference output voltage | Stable 2.5V source with ±10mA sourcing/sinking capability - directly interfaces with SAR/ΔΣ ADC VREF pins and precision op-amp feedback networks. |
| 3 (GND) | Ground reference | Low-impedance return path; requires solid ground plane connection to minimize thermal EMF errors and PSRR degradation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with HBM ±2kV / CDM ±1kV ESD robustness - meets automotive electronics reliability standards. |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage guidance - accelerates ISO 26262 ASIL-B system certification. |
| No output capacitor required | Enables zero-component reference design - reduces BOM count and PCB area in space-limited modules like radar MMIC power supplies. |
| Low noise & high PSRR | 33µVP-P (0.1–10Hz) and >60dB PSRR at 1kHz - preserves signal integrity in noisy automotive environments with switching regulators. |
| Thermal hysteresis | ≤100ppm (first cycle) - ensures repeatable voltage accuracy after thermal cycling in engine bay or powertrain control units. |
Applications
| Automotive Battery Management System (BMS) | Radar Front-End Signal Conditioning |
|---|---|
Use Scenario: Precision cell voltage monitoring in 48V mild-hybrid battery packs with isolated CAN communication. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for 16-bit SAR ADCs measuring individual Li-ion cell voltages under varying thermal loads. Use Value: Enables ≤1mV measurement resolution across –40°C to +125°C ambient, meeting ASIL-C voltage monitoring requirements. |
Use Scenario: Biasing low-noise amplifiers and ADCs in 77GHz automotive radar receivers. IC Role / Device Role / Timing Role: Supplies regulated 2.5V reference to RF signal chain components requiring sub-µV noise and minimal thermal drift. Use Value: Maintains <0.05 LSB error in 16-bit digitization of Doppler-shifted IF signals despite rapid engine-bay temperature transients. |
| Electric Power Steering (EPS) Control Unit | ADAS Camera Module Analog Front-End |
Use Scenario: Torque sensor signal conditioning and motor phase current sensing in steer-by-wire systems. IC Role / Device Role / Timing Role: Generates reference for dual 12-bit delta-sigma ADCs sampling Hall-effect and shunt-based current sensors. Use Value: Delivers <±0.5% total unadjusted error over lifetime, supporting ISO 26262 ASIL-D torque estimation accuracy targets. |
Use Scenario: Reference voltage for image sensor ADCs and auto-exposure control circuits in surround-view camera ECUs. IC Role / Device Role / Timing Role: Supplies 2.5V reference to high-speed image pipeline ADCs operating at 60+ fps with variable gain. Use Value: Ensures consistent color fidelity and dynamic range across wide ambient temperature swings during vehicle startup and parking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6025AESA+ | 2.5V, ±0.15% initial accuracy, 25ppm/°C max drift, 65µA IQ, SO-8 package | Higher accuracy but wider drift and larger footprint - suitable for non-automotive industrial data loggers | Prefer when tighter initial tolerance outweighs automotive qualification and thermal stability needs |
| ADR3425ARJZ-R7 | 2.5V, ±0.1% initial accuracy, 10ppm/°C max drift, 120µA IQ, SOT-23 package, AEC-Q100 Grade 2 (–40°C to +105°C) | Narrower temp range and higher cost - fits ADAS vision systems with less extreme under-hood exposure | Select when 10ppm/°C drift is mandatory and Grade 2 temperature range suffices for cabin-mounted modules |
Compared with MAX6025AESA+ and ADR3425ARJZ-R7, REF3125AQDBZRQ1 uniquely balances AEC-Q100 Grade 1 qualification, 20ppm/°C drift over –40°C to +125°C, and 3-pin SOT-23 size - making it optimal for space- and temperature-constrained powertrain and radar applications where full automotive grade compliance is non-negotiable.
Availability
REF3125AQDBZRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, ADAS radar front-ends, and electric power steering control units requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for REF3125AQDBZRQ1 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 electronics experience and broad AEC-Q100 qualified product portfolios.
The REF31xx-Q1 family was engineered specifically for high-reliability automotive signal chains - delivering precision voltage references that meet stringent drift, noise, ESD, and thermal hysteresis requirements in powertrain, ADAS, and infotainment systems.
FAQ
What is the maximum operating temperature range for REF3125AQDBZRQ1?
REF3125AQDBZRQ1 is rated for continuous operation from –40°C to +125°C, fully compliant with AEC-Q100 Grade 1 requirements. This range covers under-hood environments in HEV/EV powertrain systems and engine control units where ambient temperatures exceed 105°C. The device maintains specified electrical characteristics - including 20ppm/°C max drift and 115µA max quiescent current - across this full range.
Does REF3125AQDBZRQ1 require an output capacitor for stability?
No, REF3125AQDBZRQ1 does not require an output capacitor for stability. Its internal compensation enables unconditional stability with capacitive loads from 0pF to 10µF. This eliminates BOM cost and PCB area for external capacitors in space-constrained automotive modules. However, if used, TI recommends a low-ESR capacitor ≥0.5Ω to avoid potential peaking in transient response.
What is the minimum input voltage needed for REF3125AQDBZRQ1 to regulate at 2.5V?
REF3125AQDBZRQ1 requires a minimum input voltage of VOUT + 5mV = 2.505V under no-load conditions. With 10mA load, dropout rises to ≤50mV, requiring ≥2.55V input. This ultra-low dropout enables operation from marginally regulated supplies such as buck converter outputs or partially discharged 3.3V battery rails - critical for fail-safe operation in automotive safety systems.
How does REF3125AQDBZRQ1 support functional safety compliance in automotive designs?
REF3125AQDBZRQ1 is functional safety-capable with documented FIT rate, failure mode effects analysis (FMEA), and diagnostic coverage guidance provided by Texas Instruments. These resources assist system architects in meeting ISO 26262 ASIL-B requirements for voltage reference subsystems in battery monitors and radar controllers - reducing validation effort and accelerating safety case development.
What packaging and marking information is associated with REF3125AQDBZRQ1?
REF3125AQDBZRQ1 uses the 3-pin SOT-23 (DBZ) package with dimensions 2.92mm × 2.37mm. The orderable part number is laser-marked on the top surface per TI's standard SOT-23 marking convention. RoHS-compliant, lead-free finish with MSL Level 1 rating (unlimited floor life at ≤30°C/60% RH) ensures compatibility with standard automotive PCB assembly processes.
REF3125AQDBZRQ1 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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 33µVp-p
- Noise - 10Hz to 10kHz:
- 48µVrms
- Voltage - Input:
- 2.55V ~ 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
REF3125AQDBZRQ1 FAQ
1.How can I place an order for REF3125AQDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3125AQDBZRQ1 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 REF3125AQDBZRQ1 reliable?
The price and inventory of REF3125AQDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3125AQDBZRQ1 is usually 5 days.
3.What payment methods are accepted for REF3125AQDBZRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3125AQDBZRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3125AQDBZRQ1?
REF3125AQDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3125AQDBZRQ1 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 REF3125AQDBZRQ1?
For technical support, including REF3125AQDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3125AQDBZRQ1 requirements.
6.How does Aetrix verify that REF3125AQDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All REF3125AQDBZRQ1 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 REF3125AQDBZRQ1 meets industry standards.
7.What is the process for return or replacement of REF3125AQDBZRQ1?
All REF3125AQDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF3125AQDBZRQ1, 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 REF3125AQDBZRQ1 part is unused and in its original packaging.
Return procedure for REF3125AQDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3125AQDBZRQ1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
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
-
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
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