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Texas Instruments REF2912AIDBZR
- Part No.:
- REF2912AIDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF2912AIDBZR.pdf
- Description:
- IC VREF SERIES 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,861
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Product details
Overview
REF2912AIDBZR from Texas Instruments is a precision 1.25 V CMOS band-gap voltage reference in a 3-pin SOT-23 package, delivering ±2% initial accuracy, 100 ppm/°C max temperature drift, and ultra-low 1 mV dropout voltage. It supplies up to 25 mA with only 50 µA quiescent current, enabling use in high-accuracy ADC biasing and portable medical instrumentation.
For engineers reviewing the REF2912AIDBZR datasheet, REF2912AIDBZR pinout, REF2912AIDBZR application, or REF2912AIDBZR equivalent, key selection criteria include its 1.25 V output stability across –40°C to 125°C, load regulation of ≤100 µV/mA, and compatibility with capacitive loads without mandatory output capacitance.
Technical Context
The REF2912AIDBZR implements a curvature-corrected band-gap topology using two bipolar transistors (Q1, Q2) biased at different current densities to generate a PTAT voltage across R1, summed with a CTAT VBE to achieve near-zero thermal coefficient. Its CMOS architecture enables rail-to-rail operation down to 1.8 V supply.
It operates without an output capacitor but remains stable with any capacitive load-including low-ESR types-due to internal compensation. Thermal hysteresis is specified at ≤100 ppm after cycling from –40°C to 125°C and return to 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25 V ±2% (1.225–1.275 V); provides precise scaling for 12-bit+ SAR/ΔΣ ADCs requiring tight reference tolerance. |
| Temperature Drift | Max 100 ppm/°C (–40°C to 125°C); ensures ≤±15.6 µV/°C output variation, critical for industrial sensor front-ends. |
| Dropout Voltage | 1 mV (unloaded); allows operation with VIN as low as 1.8 V, enabling direct use from single-cell Li-ion or coin-cell sources. |
| Quiescent Current | Max 50 µA (–40°C to 125°C); supports >10-year battery life in always-on portable monitors and IoT edge nodes. |
| Load Regulation | ≤100 µV/mA (0–25 mA); maintains <0.008% output shift under full load, eliminating need for external force-sense routing in compact layouts. |
| Noise (0.1–10 Hz) | 14 µVPP; contributes <0.011 LSB error in 16-bit systems, suitable for high-resolution weigh scales and precision DAQ. |
| Long-Term Stability | 24 ppm (0–1000 hrs); predicts <0.0024% output drift over first 42 days, supporting calibration-interval planning in test equipment. |
Pinout & Package
SOT-23 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount with gull-wing leads. RoHS-compliant, moisture sensitivity level 1 (MSL-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply connection | Accepts 1.8 V to 5.5 V; minimum headroom = 1 mV above VOUT for unloaded operation. |
| 2 (OUT) | Precision reference output | Delivers regulated 1.25 V; stable with no output capacitor; supports up to 25 mA sink/source. |
| 3 (GND) | Analog ground reference | Must connect to clean analog ground plane; shared ground with load improves PSRR and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| MicroSIZE SOT-23 packaging | Enables placement within 1 mm of ADC reference pins, minimizing trace inductance and noise pickup in space-constrained PCBs. |
| Low dropout (1 mV) | Permits direct regulation from low-voltage rails (e.g., 1.8 V LDO outputs), eliminating cascaded regulators in multi-rail systems. |
| No output capacitor required | Reduces BOM count and board area; simplifies layout while maintaining stability with 10 µF ceramic or bulk electrolytic loads. |
| High output current (25 mA) | Drives multiple ADCs, op-amps, or DACs simultaneously-eliminates need for external buffer stages in multi-channel data acquisition. |
| Low IQ (50 µA max) | Enables continuous reference operation during deep-sleep MCU states, preserving system wake-up accuracy without power cycling. |
Applications
| Portable Medical Sensors | Data Acquisition Systems |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) with integrated 16-bit ADC sampling electrochemical sensor output. IC Role / Device Role / Timing Role: Provides stable 1.25 V reference for ADC conversion and biasing of transimpedance amplifier. Use Value: 100 ppm/°C drift ensures <±0.2% measurement error across patient body temperature range (32–42°C), meeting ISO 15197 clinical accuracy requirements. |
Use Scenario: Industrial PLC analog input module digitizing 4–20 mA current loops with 24-bit ΔΣ ADC. IC Role / Device Role / Timing Role: Supplies precision reference voltage and excitation for RTD/thermocouple signal conditioning circuits. Use Value: 14 µVPP low-frequency noise prevents aliasing into 0.1 Hz–10 Hz process control bandwidth, preserving sub-LSB resolution. |
| Hand-Held Test Equipment | Battery-Powered Instrumentation |
Use Scenario: Portable multimeter with autoranging and auto-zero functions requiring stable reference across battery discharge (3.6 V → 2.8 V). IC Role / Device Role / Timing Role: Reference source for dual-slope integrator and comparator thresholds in DC voltage measurement path. Use Value: 1 mV dropout allows uninterrupted operation down to 1.8 V supply, extending usable battery life by 35% versus 2.5 V references. |
Use Scenario: Wireless environmental sensor node (temperature/humidity/pressure) powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supplies reference for microcontroller's internal ADC and powers low-noise signal chain amplifiers. Use Value: 50 µA quiescent current enables >5-year shelf life with 220 mAh capacity, assuming 10-second wake-up intervals and 1 µA sleep current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AASA12+ | 1.2 V output, 3 ppm/°C max drift, 12 µVPP noise, 65 µA IQ, SO-8 package | Higher precision for metrology-grade instruments; larger footprint limits portable designs | Select when drift budget <50 ppm/°C is required and board space permits SO-8 |
| ADR3412ARJZ-R7 | 1.2 V output, 30 ppm/°C max drift, 10 µVPP noise, 120 µA IQ, SOT-23-5 package | Lower noise and drift than REF2912AIDBZR but higher IQ and 2 extra pins for enable/shutdown | Choose when ultra-low noise dominates over battery life, and enable control is needed |
Compared with MAX6126AASA12+ and ADR3412ARJZ-R7, REF2912AIDBZR offers the lowest quiescent current and smallest footprint among 1.2–1.25 V references, making it optimal for size- and power-constrained portable systems where ±2% initial accuracy is sufficient.
Availability
REF2912AIDBZR is available at Aetrix Electronics and suitable for portable medical sensors, data acquisition systems, hand-held test equipment, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for REF2912AIDBZR 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 expertise in precision reference design and high-reliability manufacturing.
The REF29xx family was engineered for ultra-low-power, high-accuracy voltage referencing in portable and industrial measurement systems-prioritizing minimal dropout, wide temperature operation, and robust capacitive-load stability.
FAQ
What is the minimum input voltage required for stable operation of the REF2912AIDBZR?
The REF2912AIDBZR requires a minimum input voltage of 1.8 V, which is 550 mV above its 1.25 V nominal output. In unloaded conditions, it can operate with as little as 1 mV headroom (i.e., VIN ≥ VOUT + 1 mV), but the 1.8 V specification ensures guaranteed performance across temperature and load extremes per the datasheet's Recommended Operating Conditions.
Does the REF2912AIDBZR require an output capacitor for stability?
No, the REF2912AIDBZR does not require an output capacitor for stability-it is internally compensated and remains stable with any capacitive load, including zero capacitance. However, a 0.47 µF ceramic bypass capacitor on the input is recommended to suppress supply noise and improve transient response.
How does the REF2912AIDBZR perform under varying load current conditions?
The REF2912AIDBZR exhibits ≤100 µV/mA load regulation from 0 to 25 mA, meaning its output shifts less than 2.5 mV across full load. This performance holds without force-sense connections, though using them further reduces trace-resistance effects-critical for maintaining accuracy in multi-ADC or high-current sensor-biasing applications.
Can the REF2912AIDBZR be used in automotive applications?
The REF2912AIDBZR is specified for –40°C to 125°C operating temperature and qualified to JEDEC standards, making it suitable for under-hood and cabin-located automotive subsystems such as battery monitoring, ADAS sensor interfaces, and infotainment analog front-ends-provided system-level AEC-Q200 stress testing is performed.
What is the long-term output voltage drift behavior of the REF2912AIDBZR?
The REF2912AIDBZR shows 24 ppm drift over the first 1000 hours and 15 ppm over the subsequent 1000 hours (total 39 ppm at 2000 hrs), based on accelerated life testing of 30 units. This predictable aging profile supports calibration interval planning in test equipment and medical devices requiring traceable metrology.
REF2912AIDBZR 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:
- 25 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 14µVp-p
- Noise - 10Hz to 10kHz:
- 42µVrms
- Voltage - Input:
- 1.8V ~ 5.5V
- Current - Supply:
- 59µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
REF2912AIDBZR FAQ
1.How can I place an order for REF2912AIDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2912AIDBZR 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 REF2912AIDBZR reliable?
The price and inventory of REF2912AIDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2912AIDBZR is usually 5 days.
3.What payment methods are accepted for REF2912AIDBZR?
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4.How is shipping managed for REF2912AIDBZR?
REF2912AIDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2912AIDBZR 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 REF2912AIDBZR?
For technical support, including REF2912AIDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2912AIDBZR requirements.
6.How does Aetrix verify that REF2912AIDBZR is sourced from the original manufacturer or authorized distributors?
All REF2912AIDBZR 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 REF2912AIDBZR meets industry standards.
7.What is the process for return or replacement of REF2912AIDBZR?
All REF2912AIDBZR units undergo pre-shipment inspection (PSI). If there is an issue with REF2912AIDBZR, 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 REF2912AIDBZR part is unused and in its original packaging.
Return procedure for REF2912AIDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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