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Texas Instruments REF1112AIDBZT
- Part No.:
- REF1112AIDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF1112AIDBZT.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,013
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Product details
Overview
REF1112AIDBZT from Texas Instruments is a two-terminal shunt voltage reference delivering 1.25V ±0.2% output with 25μVpp low-frequency noise (0.1Hz–10Hz), 50ppm/°C max tempco over −40°C to +85°C, and ultra-low 1.2μA minimum operating current in SOT-23-3 package - used for precision biasing in battery-powered medical sensors and field transmitters.
For engineers reviewing the REF1112AIDBZT datasheet, REF1112AIDBZT pinout, REF1112AIDBZT application, or REF1112AIDBZT equivalent, key selection criteria include guaranteed 1.2μA start-up current, 0.2% initial accuracy, 50ppm/°C tempco over industrial temperature range, and compatibility with micropower op-amps like TLV240x in space-constrained analog front-ends.
Technical Context
The REF1112AIDBZT operates as a bandgap-based shunt reference requiring external bias resistor and load capacitor; regulation is achieved by dynamically shunting excess current to ground while maintaining stable 1.25V across its terminals. Its internal thin-film resistors enable 0.2% initial tolerance and low thermal hysteresis (100ppm).
It functions only in closed-loop mode with fixed output - no external feedback or adjustment possible. Stable operation requires cathode current between 1.2μA and 5mA across −40°C to +125°C, with dynamic impedance as low as 0.135Ω and reverse breakdown voltage tightly distributed (±0.0025V at 1.2μA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25V ±0.0025V (±0.2%) at 1.2μA - enables direct replacement of legacy references without recalibration in 12-bit+ data acquisition systems. |
| Tempco (−40°C to +85°C) | ≤50ppm/°C - ensures ≤0.625mV drift over full industrial range, critical for calibrators and portable test equipment. |
| Low-Frequency Noise | 25μVpp (0.1Hz–10Hz) - supports high-resolution delta-sigma ADCs without added filtering overhead. |
| Min Operating Current | 1.2μA - allows operation from coin cells or energy-harvesting sources where supply current must stay below 2μA. |
| Dynamic Impedance | 0.135Ω (typical) - minimizes load-induced voltage shift during transient current steps in sensor signal chains. |
| Long-Term Stability | 60ppm/kHr - guarantees <±0.01% output drift over 5 years in unattended field transmitter deployments. |
| ESD Rating (HBM) | ±2000V - meets IEC 61000-4-2 Level 2 for robustness in building security sensor assembly lines. |
Pinout & Package
SOT-23-3 (DBZ) package, 2.92mm × 1.3mm body size, 1.12mm max height, RoHS-compliant NIPDAU/SN lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Vo) | Shunt current/voltage terminal | Anode connection - sinks total cathode current (IREF + ILOAD); must be biased above 1.25V via RBIAS for regulation. |
| Pin 2 (GND) | Ground reference | Common return path for load current and bias current; low-impedance PCB pour required for noise-sensitive applications. |
| Pin 3 (NC) | No-connect terminal | Must remain unconnected or tied to GND - floating NC pin causes instability; not usable as auxiliary signal node. |
Key Features
| Feature | Design Value |
|---|---|
| 1.25V fixed shunt reference | Eliminates external resistor divider and trimming in 1.25V reference designs - reduces BOM count and layout area by 30% vs adjustable solutions. |
| 1.2μA minimum operating current | Enables continuous operation from 3.0V coin cell for >10 years (assuming 50nA system sleep current), ideal for wireless sensor nodes. |
| 25μVpp low-frequency noise | Permits direct interface to 24-bit sigma-delta ADCs (e.g., ADS1262) without post-filtering, preserving SNR in medical ECG front-ends. |
| 0.2% initial accuracy | Reduces factory calibration time by eliminating first-pass trim in handheld calibrators and portable multimeters. |
| −40°C to +125°C operation | Supports under-hood automotive sensor modules and industrial process transmitters without derating or heatsinking. |
Applications
| Battery-Powered Instrumentation | Building Security Sensors |
|---|---|
Use Scenario: Portable pH meter powered by CR2032 coin cell with 16-bit SAR ADC sampling at 10ksps. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.25V reference for ADC and analog front-end op-amp biasing. Use Value: 1.2μA min current enables >7-year battery life; 25μVpp noise avoids digital filtering latency in real-time measurement. |
Use Scenario: Wireless PIR motion detector with ultra-low-power MCU and RF transceiver operating on AA batteries. IC Role / Device Role / Timing Role: Precision voltage reference for comparator threshold setting and sensor signal conditioning. Use Value: 0.2% accuracy ensures consistent detection sensitivity across temperature; SOT-23-3 footprint saves 40% board area vs SOIC-8 alternatives. |
| Medical Equipment | Field Transmitters |
Use Scenario: Handheld pulse oximeter with analog photodiode front-end and 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Low-noise shunt reference for transimpedance amplifier gain-setting and ADC reference rail. Use Value: 25μVpp noise prevents baseline wander in SpO₂ calculation; 50ppm/°C tempco maintains clinical-grade accuracy from 0°C to 40°C ambient. |
Use Scenario: 4–20mA HART-enabled pressure transmitter mounted in oil refinery piping (−40°C to +85°C ambient). IC Role / Device Role / Timing Role: Primary voltage reference for DAC output scaling and loop current regulation circuitry. Use Value: 60ppm/kHr long-term stability ensures <±0.05% span error over 15-year service life; MSL Level-1 supports automated reflow assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 2.5V fixed output, 80μA min operating current, ±0.5% initial tolerance, SOT-23-3 | Higher power consumption limits use in sub-μA energy harvesting; 2.5V output requires redesign of existing 1.25V circuits | Select when 2.5V reference is acceptable and higher accuracy is not required - lower cost but sacrifices micropower advantage. |
| MAX6008AEUR+T | 1.25V output, ±0.2% tolerance, 3.5μA min current, SC70-3 package, 75ppm/°C tempco (−40°C to +85°C) | Larger tempco increases drift by 0.5mV over industrial range; SC70-3 has tighter placement constraints than SOT-23 | Choose if SOT-23 footprint is unavailable - same voltage and accuracy, but reduced thermal performance and higher quiescent current. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, REF1112AIDBZT uniquely delivers 1.25V ±0.2% accuracy with 1.2μA start-up current and 50ppm/°C tempco in standard SOT-23-3 - making it the only option meeting simultaneous requirements for ultra-low power, tight voltage tolerance, and industrial temperature stability.
Availability
REF1112AIDBZT is available at Aetrix Electronics and suitable for battery-powered instrumentation, building security sensors, and field transmitters requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for REF1112AIDBZT 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 since 1930.
The REF1112AIDBZT belongs to TI's precision shunt voltage reference product line, designed specifically for ultra-low-power, space-constrained applications such as portable medical devices and wireless industrial sensors.
FAQ
What is the minimum operating current required for stable regulation of the REF1112AIDBZT?
The REF1112AIDBZT requires a minimum operating current of 1.2μA to maintain stable 1.25V output regulation across −40°C to +125°C. Below this threshold, output voltage drops nonlinearly and noise increases significantly. This value is verified per Electrical Characteristics table in SBOS283E Rev E, tested at 1.2μA with 10nF load capacitance.
Can the REF1112AIDBZT be used as a 2.5V reference, and if so, how?
Yes - the REF1112AIDBZT can generate 2.5V by stacking two units in series, as documented in Figure 7-3 of SBOS283E. Each REF1112AIDBZT contributes 1.25V, yielding 2.5V total with combined 1μA bias current. This configuration preserves micropower operation and requires no additional active components.
What is the maximum allowable reverse current for the REF1112AIDBZT?
The absolute maximum reverse current for the REF1112AIDBZT is 10mA, per Absolute Maximum Ratings section of SBOS283E. However, the recommended operating range is 1.2μA to 5mA - exceeding 5mA risks increased dynamic impedance and thermal drift without improving regulation performance.
Does the REF1112AIDBZT require an external capacitor, and what value is recommended?
Yes - a minimum 0.01μF ceramic capacitor at the Vo pin is required for stable operation, and 0.1μF is recommended for varying load conditions per Section 7.1 of SBOS283E. This capacitor suppresses high-frequency oscillation and improves transient response; placement within 2mm of Vo and GND pins is critical for noise-sensitive applications.
How does the REF1112AIDBZT compare to the REF1004 in terms of power efficiency?
The REF1112AIDBZT draws 1.2μA minimum current - a 10× reduction versus the REF1004's 12μA typical minimum. This enables direct replacement in space- and power-constrained designs using SOT-23-3 instead of larger SOIC-8 packaging, reducing PCB area by 70% while maintaining ±0.2% accuracy and extended temperature operation.
REF1112AIDBZT 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:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 15ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- 25µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1.2 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
REF1112AIDBZT FAQ
1.How can I place an order for REF1112AIDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for REF1112AIDBZT 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 REF1112AIDBZT reliable?
The price and inventory of REF1112AIDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF1112AIDBZT is usually 5 days.
3.What payment methods are accepted for REF1112AIDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF1112AIDBZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF1112AIDBZT?
REF1112AIDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF1112AIDBZT 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 REF1112AIDBZT?
For technical support, including REF1112AIDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF1112AIDBZT requirements.
6.How does Aetrix verify that REF1112AIDBZT is sourced from the original manufacturer or authorized distributors?
All REF1112AIDBZT 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 REF1112AIDBZT meets industry standards.
7.What is the process for return or replacement of REF1112AIDBZT?
All REF1112AIDBZT units undergo pre-shipment inspection (PSI). If there is an issue with REF1112AIDBZT, 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 REF1112AIDBZT part is unused and in its original packaging.
Return procedure for REF1112AIDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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