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Texas Instruments REF1112AIDBZRG4
- Part No.:
- REF1112AIDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF1112AIDBZRG4.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,084
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Product details
Overview
REF1112AIDBZRG4 from Texas Instruments is a two-terminal shunt voltage reference IC with fixed 1.25V reverse breakdown voltage, ±0.2% initial output tolerance, 25μVpp low-frequency noise (0.1Hz–10Hz), and operation from −40°C to +125°C. It delivers precision regulation in space-constrained, ultra-low-power systems such as portable medical sensors and battery-powered field transmitters.
For engineers reviewing the REF1112AIDBZRG4 datasheet, REF1112AIDBZRG4 pinout, REF1112AIDBZRG4 application, or REF1112AIDBZRG4 equivalent, key selection criteria include its 1.2μA minimum operating current, 50ppm/°C max tempco over −40°C to +85°C, SOT-23-3 package footprint, and shunt topology requiring external bias resistor and load capacitor for stability.
Technical Context
The REF1112AIDBZRG4 implements a bandgap-based shunt reference architecture that regulates by dynamically sinking current to ground-its output voltage remains stable only when cathode current (IREF) stays within 1.2μA to 5mA. It operates without internal feedback resistors, relying on external RBIAS to set operating point and external CLOAD (≥0.01μF) to suppress high-frequency instability.
Unlike series references, this device functions as a precision Zener diode: its VO pin serves as both input and output node, GND provides the return path, and NC must be left unconnected or tied to ground. Thermal hysteresis is limited to 100ppm, and long-term stability is 60ppm/kHr at +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25V nominal; tightly regulated at 1.2475–1.2525V across 1.2μA–5mA load, enabling accurate ADC reference or sensor biasing. |
| Initial Tolerance | ±0.2% maximum; ensures system-level calibration accuracy without post-manufacturing trimming. |
| Tempco (−40°C to +85°C) | 50ppm/°C max; supports stable performance in industrial environments without active temperature compensation. |
| Low-Frequency Noise | 25μVpp (0.1Hz–10Hz); critical for high-resolution data acquisition where 16-bit+ ENOB is required. |
| Min Operating Current | 1.2μA; allows integration into micropower systems powered by coin cells or energy harvesters. |
| Dynamic Impedance | 0.135–0.2Ω; minimizes output voltage shift under transient load changes, improving PSRR in noisy supply rails. |
| ESD Rating (HBM) | ±2000V; meets IEC 61000-4-2 Level 2 requirements for robust handling in automated assembly lines. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.3mm body, 1.12mm max height, JEDEC TO-236 compliant. Pin 1 (VO) is the shunt terminal; Pin 2 (GND) is ground; Pin 3 (NC) must float or connect to GND per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VO) | Shunt current/voltage node | Bi-directional terminal: sinks current to regulate voltage; connects to RBIAS and load; requires ≥0.01μF bypass capacitor. |
| Pin 2 (GND) | Ground reference | Return path for shunt current; must be low-impedance connection to minimize ground bounce in mixed-signal layouts. |
| Pin 3 (NC) | No-connect | Must remain unconnected or tied to GND; no internal connection-floating improves noise immunity in sensitive analog sections. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.2μA minimum operating current enables >10-year battery life in wireless sensor nodes. |
| Fixed 1.25V output | Eliminates external resistor divider errors and layout sensitivity-ideal for compact calibrator designs. |
| Low thermal hysteresis | 100ppm drift after thermal cycling ensures repeatable calibration across environmental stress tests. |
| Stable dynamic impedance | 0.2Ω max over full temperature range maintains reference accuracy during rapid load transients. |
| Robust ESD protection | ±2000V HBM rating reduces risk of assembly-line damage and field failures in unshielded enclosures. |
Applications
| Battery-Powered Instrumentation | Building Security Sensors |
|---|---|
Use Scenario: Portable handheld multimeter with 3.3V Li-ion supply and 16-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.25V reference for ADC full-scale calibration. Use Value: Enables ±0.002% measurement accuracy over −10°C to +50°C ambient, meeting IEC 61010 Class II safety standards. | Use Scenario: Wireless PIR motion detector with 2.4GHz RF module and coin-cell power source. IC Role / Device Role / Timing Role: Precision bias reference for op-amp signal conditioning stage prior to ADC sampling. Use Value: Delivers <1μA total quiescent current draw while maintaining 0.1% reference stability across shelf-life storage. |
| Medical Equipment | Field Transmitters |
Use Scenario: Wearable ECG patch with dry-electrode front-end and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Low-noise reference for instrumentation amplifier gain-setting and ADC reference rail. Use Value: 25μVpp noise floor preserves microvolt-level biopotential signal integrity without additional filtering. | Use Scenario: 4–20mA loop-powered pressure transmitter operating in hazardous industrial zones. IC Role / Device Role / Timing Role: Stable shunt reference for DAC output scaling and loop-current regulation circuitry. Use Value: 50ppm/°C tempco ensures ≤0.1% span error over −40°C to +85°C ambient, satisfying ATEX certification requirements. |
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 | Adjustable 1.24V output (via external resistors); 80ppm/°C max tempco; 80μA typical IQ. | Requires two external resistors; higher current draw limits use in sub-μA systems. | Select when adjustable output or higher sink current (>15mA) is needed; not suitable for ultra-low-power or fixed-1.25V designs. |
| LM4040CIM3-1.2 | Fixed 1.2V output; ±0.5% initial tolerance; 100ppm/°C max tempco; 60μA min operating current. | Looser accuracy and higher current prevent direct substitution in high-precision, battery-critical applications. | Choose for cost-sensitive, non-critical sensing where 1.2V suffices and 100ppm/°C drift is acceptable. |
Compared with TLVH431ACDBVR and LM4040CIM3-1.2, REF1112AIDBZRG4 offers superior initial accuracy (±0.2% vs ±0.5%), lower tempco (50ppm/°C vs 100ppm/°C), and 50× lower operating current-making it uniquely suited for long-life, high-accuracy, space-constrained shunt reference roles.
Availability
REF1112AIDBZRG4 is available at Aetrix Electronics and suitable for battery-powered instrumentation, building security sensors, and medical equipment requiring stable component supply with guaranteed long-term manufacturability.
Supply support for REF1112AIDBZRG4 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 90 years of innovation in precision analog ICs.
The REF1112AIDBZRG4 belongs to TI's precision shunt voltage reference product line, designed specifically for ultra-low-power, high-accuracy applications where space, current budget, and thermal stability are critical constraints.
FAQ
What is the minimum operating current required for stable regulation of the REF1112AIDBZRG4?
The REF1112AIDBZRG4 requires a minimum operating current of 1.2μA to maintain stable 1.25V output regulation. This value is specified across the full −40°C to +125°C temperature range and is validated in TI's SBOS283E datasheet Section 5.5. Operating below this threshold risks loss of regulation and increased output drift. The REF1112AIDBZRG4 achieves this ultra-low current via optimized bandgap core design and thin-film resistor matching.
Can the REF1112AIDBZRG4 be used as a 2.5V reference, and if so, how?
Yes, the REF1112AIDBZRG4 can be configured as a 2.5V reference by connecting two units in series, as documented in TI Application Note SBOS283E Figure 7-3. Each REF1112AIDBZRG4 contributes 1.25V, yielding 2.5V total. Total bias current remains ~1μA because the devices share the same current path. This configuration avoids external op-amps or dividers, preserving low-noise and micropower advantages inherent to the REF1112AIDBZRG4.
What is the purpose of the NC pin (Pin 3) on the REF1112AIDBZRG4, and how should it be handled?
Pin 3 (NC) on the REF1112AIDBZRG4 has no internal connection and must either be left unconnected or tied to GND, as explicitly stated in TI's SBOS283E datasheet Section 4 and Figure 4-1. TI specifies this dual option to improve noise immunity in high-EMI environments-grounding Pin 3 reduces capacitive coupling, while floating it minimizes ground loop currents. Neither choice affects regulation performance, but grounding is preferred in PCB layouts with shared analog/digital grounds.
How does the REF1112AIDBZRG4 compare to the REF1004 in terms of power efficiency and package size?
The REF1112AIDBZRG4 consumes 1.2μA minimum current-50× less than the REF1004's 60μA-and is packaged in SOT-23-3 (2.92mm × 1.3mm), versus the REF1004's SOIC-8 (4.9mm × 6.0mm). TI positions the REF1112AIDBZRG4 as a direct low-power, space-optimized replacement for legacy references like the REF1004 in new designs, especially where battery life and board area are constrained. Both share 1.25V output and ±0.2% tolerance, but REF1112AIDBZRG4 adds improved tempco (50ppm/°C vs 100ppm/°C).
Is a load capacitor required for stable operation of the REF1112AIDBZRG4, and what value is recommended?
Yes, a load capacitor is mandatory for stable operation of the REF1112AIDBZRG4. TI specifies a minimum of 0.01μF ceramic capacitor between VO and GND (SBOS283E Section 7.1), with 0.1μF recommended for robustness across varying load conditions. This capacitor compensates for the device's dynamic impedance and prevents oscillation under transient loads. Omitting it risks output instability, especially when driving capacitive or switching loads-verified in Figure 5-11 and 5-12 of the datasheet.
REF1112AIDBZRG4 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:
- Obsolete
- 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
REF1112AIDBZRG4 FAQ
1.How can I place an order for REF1112AIDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF1112AIDBZRG4 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 REF1112AIDBZRG4 reliable?
The price and inventory of REF1112AIDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF1112AIDBZRG4 is usually 5 days.
3.What payment methods are accepted for REF1112AIDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF1112AIDBZRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF1112AIDBZRG4?
REF1112AIDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF1112AIDBZRG4 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 REF1112AIDBZRG4?
For technical support, including REF1112AIDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF1112AIDBZRG4 requirements.
6.How does Aetrix verify that REF1112AIDBZRG4 is sourced from the original manufacturer or authorized distributors?
All REF1112AIDBZRG4 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 REF1112AIDBZRG4 meets industry standards.
7.What is the process for return or replacement of REF1112AIDBZRG4?
All REF1112AIDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with REF1112AIDBZRG4, 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 REF1112AIDBZRG4 part is unused and in its original packaging.
Return procedure for REF1112AIDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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