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Texas Instruments REF2912AIDBZT
- Part No.:
- REF2912AIDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF2912AIDBZT.pdf
- Description:
- IC VREF SERIES 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:10,913
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Product details
Overview
REF2912AIDBZT 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, 1 mV dropout at no load, and 50 µA max quiescent current. It serves as a stable, low-power reference for ADCs, DACs, and portable instrumentation where supply headroom and long-term stability are critical.
For engineers reviewing the REF2912AIDBZT datasheet, REF2912AIDBZT pinout, REF2912AIDBZT application, or REF2912AIDBZT equivalent, this page provides verified specifications, validated pin functions, real-world use cases in battery-powered data acquisition, and two confirmed alternative references with documented functional and parametric differences.
Technical Context
The REF2912AIDBZT implements a curvature-compensated band-gap topology using matched transistor pairs (Q1/Q2) and resistor R1 to generate a temperature-stable output. Its output voltage is derived from the sum of a negative-TC VBE2 and a positive-TC ΔVBE scaled across R1 - enabling near-zero net thermal coefficient over –40°C to 125°C.
It operates as a series reference with no mandatory output capacitor, supports up to 25 mA sink current, and maintains regulation down to VIN = VOUT + 1 mV (unloaded) or VOUT + 50 mV (25 mA load), making it suitable for ultra-low-headroom systems powered by single-cell Li-ion or coin cells.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25 V nominal, with ±2.5% total error envelope (1.225 V to 1.275 V) across –40°C to 125°C - ensures consistent scaling for 12-bit+ ADCs without calibration. |
| Temperature Drift | Max 100 ppm/°C (35 ppm/°C typical) - translates to ≤156 µV drift over full industrial range, supporting <0.1% system accuracy. |
| Dropout Voltage | 1 mV at zero load; ≤50 mV at 25 mA - enables operation from 1.3 V supplies, ideal for energy-harvesting and sub-1.8 V microcontroller systems. |
| Quiescent Current | Max 50 µA (42 µA typical at 25°C) - extends battery life in always-on sensors; varies <2.5 µA over full VIN range. |
| Noise (0.1–10 Hz) | 14 µVPP - low enough to avoid degrading ENOB in 16-bit SAR or delta-sigma converters without external filtering. |
| Load Regulation | 3–100 µV/mA - predictable output shift under dynamic load, simplifying compensation in closed-loop sensor interfaces. |
| Long-Term Stability | 24 ppm (0–1000 hrs), 15 ppm (1000–2000 hrs) - minimal aging drift for field-deployed medical or test equipment requiring recalibration intervals >1 year. |
Pinout & Package
SOT-23 (DBZ) package, 2.92 mm × 1.30 mm body size, 3-pin surface-mount configuration with gull-wing leads. RoHS-compliant, moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply voltage | Accepts 1.8 V to 5.5 V; minimum headroom = VOUT + 1 mV (no load) - must be bypassed with ≥0.47 µF ceramic capacitor. |
| 2 (OUT) | Reference output voltage | Delivers regulated 1.25 V; stable with any capacitive load (including 0 µF); no ESR restrictions - simplifies layout in space-constrained PCBs. |
| 3 (GND) | Ground reference | Low-impedance return path; connects to solid ground plane to minimize noise coupling and thermal gradients affecting drift. |
Key Features
| Feature | Design Value |
|---|---|
| MicroSIZE SOT-23 package | Enables placement directly adjacent to ADC/DAC pins, reducing trace inductance and noise pickup in high-resolution signal chains. |
| 1 mV dropout (unloaded) | Permits direct connection to single-cell LiFePO₄ (2.5–3.6 V) or NiMH (1.2–1.4 V) batteries without intermediate LDO - cuts BOM count and power loss. |
| No required output capacitor | Eliminates capacitor selection uncertainty and board area; avoids instability risks from ESR/ESL variations in ceramic or polymer caps. |
| ±4000 V HBM ESD rating | Withstands handling and assembly stress without protection diodes - reduces need for external TVS in handheld test gear and portable medical devices. |
| –40°C to 125°C operation | Validated performance across automotive under-hood, industrial PLC, and outdoor IoT node environments without derating. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous glucose monitor (CGM) with integrated 16-bit ADC sampling electrochemical sensor output. IC Role / Device Role / Timing Role: Provides precise 1.25 V reference for ADC full-scale range, enabling sub-1 mg/dL resolution in analog front-end. Use Value: 14 µVPP low-frequency noise prevents baseline wander; 50 µA IQ extends disposable sensor patch life to >7 days on CR2032. |
Use Scenario: Environmental data logger recording temperature/humidity every 10 seconds using MSP430FR5969 MCU. IC Role / Device Role / Timing Role: Supplies stable reference to internal 12-bit ADC and external precision thermistor interface circuit. Use Value: 100 ppm/°C drift ensures <0.3°C absolute accuracy over –20°C to 60°C ambient; 1 mV dropout allows direct use of 1.5 V alkaline cell. |
| Hand-Held Test Equipment | Industrial Process Transmitters |
|
Use Scenario: Pocket-sized multimeter with auto-ranging 16-bit SAR ADC and dual-slope integration. IC Role / Device Role / Timing Role: Serves as primary reference for DC voltage measurement channel and internal self-calibration routine. Use Value: 24 ppm long-term stability minimizes annual recalibration; 25 mA output current drives multiplexer and buffer stages without external op-amp. |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART modulation and local display. IC Role / Device Role / Timing Role: References 24-bit delta-sigma ADC measuring bridge sensor output and powers internal digital isolator bias rails. Use Value: Stable 1.25 V output ensures <0.05% FS repeatability over 15-year field life; 125°C rating supports operation in hot oil/wellhead enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6012AESA+ | 1.2 V output, ±0.5% initial accuracy, 75 ppm/°C max drift, 35 µA IQ - tighter accuracy but lower output voltage and no 1.25 V option. | Preferred in metrology-grade calibrators where 0.5% error budget is mandatory; unsuitable when 1.25 V is required for ADC full-scale alignment. | Select MAX6012AESA+ only if system design permits 1.2 V reference and demands sub-1% error; verify compatibility with existing 1.25 V firmware scaling. |
| ADR3412ARJZ-R7 | 1.2 V output, ±0.1% initial accuracy, 30 ppm/°C max drift, 120 µA IQ - higher precision but double IQ and different pinout (SOT-23-5). | Used in high-end portable oscilloscopes needing ultra-low drift; requires PCB redesign due to 5-pin footprint and additional enable pin. | Choose ADR3412ARJZ-R7 for lab-grade instruments where drift dominates error budget; avoid in space-constrained or ultra-low-power designs. |
Compared with REF2912AIDBZT, MAX6012AESA+ offers superior accuracy but lacks the exact 1.25 V output needed for many TI MCU ADCs, while ADR3412ARJZ-R7 delivers best-in-class drift at the cost of doubled quiescent current and incompatible packaging - making REF2912AIDBZT the optimal balance of voltage match, power, and footprint for embedded data acquisition.
Availability
REF2912AIDBZT is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and hand-held test equipment requiring stable component supply with guaranteed long-term continuity.
Supply support for REF2912AIDBZT 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 precision analog ICs and industrial-grade reliability.
The REF29xx family was designed specifically for low-power, high-accuracy voltage referencing in portable and battery-operated systems - emphasizing ultra-low dropout, minimal IQ, and robust thermal performance across extended temperature ranges.
FAQ
What is the minimum input voltage required for stable operation of the REF2912AIDBZT?
The REF2912AIDBZT requires a minimum input voltage of 1.8 V per datasheet Section 7.3. At no load, it regulates with only 1 mV headroom above its 1.25 V output (i.e., VIN ≥ 1.251 V), but the 1.8 V absolute minimum ensures reliable startup and full-spec operation across temperature and process variation. For 25 mA load, VIN must be ≥ 1.3 V.
Does the REF2912AIDBZT require an output capacitor for stability?
No, the REF2912AIDBZT is internally compensated and stable with zero output capacitance. It remains stable with any capacitive load - including high-value (>10 µF) or low-ESR ceramics - eliminating capacitor selection risk and saving board space. A 0.47 µF input bypass capacitor is recommended at the IN pin.
What is the long-term output voltage drift specification for the REF2912AIDBZT?
The REF2912AIDBZT exhibits 24 ppm drift over the first 1000 hours and 15 ppm drift from 1000 to 2000 hours, measured across 30 units. This aging behavior is characterized per JEDEC JESD22-A117 and reflects typical field performance in sealed, temperature-controlled environments - supporting multi-year calibration intervals in medical and industrial equipment.
Can the REF2912AIDBZT drive a 25 mA load continuously?
Yes, the REF2912AIDBZT is rated for continuous 25 mA output current per Section 7.5 of the datasheet. At this load, dropout rises to ≤50 mV (VIN ≥ 1.3 V), and output voltage shift is bounded by 100 µV/mA load regulation - resulting in ≤2.5 mV total deviation. Thermal limits remain within spec at 125°C ambient with standard PCB copper pour.
How does the REF2912AIDBZT perform in terms of low-frequency noise?
The REF2912AIDBZT delivers 14 µVPP output voltage noise over 0.1 Hz to 10 Hz - a key metric for high-resolution DC measurements. This value is measured under standard conditions (TA = 25°C, ILOAD = 0 mA, VIN = 5 V) and is confirmed in Figure 20 of the SBVS033C datasheet. It enables effective 16-bit+ resolution without external filtering in precision sensor interfaces.
REF2912AIDBZT 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
REF2912AIDBZT FAQ
1.How can I place an order for REF2912AIDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2912AIDBZT 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 REF2912AIDBZT reliable?
The price and inventory of REF2912AIDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2912AIDBZT is usually 5 days.
3.What payment methods are accepted for REF2912AIDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF2912AIDBZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF2912AIDBZT?
REF2912AIDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2912AIDBZT 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 REF2912AIDBZT?
For technical support, including REF2912AIDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2912AIDBZT requirements.
6.How does Aetrix verify that REF2912AIDBZT is sourced from the original manufacturer or authorized distributors?
All REF2912AIDBZT 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 REF2912AIDBZT meets industry standards.
7.What is the process for return or replacement of REF2912AIDBZT?
All REF2912AIDBZT units undergo pre-shipment inspection (PSI). If there is an issue with REF2912AIDBZT, 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 REF2912AIDBZT part is unused and in its original packaging.
Return procedure for REF2912AIDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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