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Texas Instruments REF2033AIDDCT
- Part No.:
- REF2033AIDDCT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
REF2033AIDDCT.pdf
- Description:
- IC VREF SERIES 0.05% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,664
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Product details
Overview
REF2033AIDDCT from Texas Instruments is a dual-output, low-drift, low-power voltage reference IC providing precise 3.3 V (VREF) and 1.65 V (VBIAS = VREF/2) outputs in a single SOT-23-5 package. It delivers ±0.05% initial accuracy, 8 ppm/°C max temperature drift over –40°C to 125°C, and ±20 mA output current capability - enabling high-precision biasing of bipolar ADC inputs in single-supply industrial measurement systems.
For engineers reviewing the REF2033AIDDCT datasheet, REF2033AIDDCT pinout, REF2033AIDDCT application, or REF2033AIDDCT equivalent, this page provides verified specifications, validated pin functions, confirmed dual-output tracking behavior, real-world load/line regulation performance, and qualified alternative options for precision analog signal chains requiring stable mid-rail biasing and reference voltages.
Technical Context
The REF2033AIDDCT implements a band-gap core with e-Trim™ post-mold calibration to achieve tight initial accuracy and low temperature drift on both outputs. Its architecture uses two independent buffers - one for VREF and one for VBIAS - driven from a common trimmed band-gap voltage source, ensuring matched thermal behavior.
VREF and VBIAS track within ±6 ppm/°C (–40°C to 85°C) and ±7 ppm/°C (–40°C to 125°C), while maintaining identical electrical specs: ±0.05% accuracy, 3 ppm/V line regulation, 8 ppm/mA load regulation, and 10 mV dropout at 20 mA - all critical for minimizing differential error in ratiometric ADC systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Output | 3.3 V ±0.05% - enables direct use as ADC reference without external scaling in 3.3-V systems |
| VBIAS Output | 1.65 V (VREF/2) ±0.05% - provides exact mid-rail bias for bipolar input stages without resistor dividers |
| Temp Drift (VREF/VBIAS) | ≤8 ppm/°C (–40°C to 125°C) - ensures <±0.01% total drift across full industrial range |
| Output Current | ±20 mA - supports driving ADC reference inputs, op-amp bias networks, and small DAC loads directly |
| Dropout Voltage | 10 mV at 20 mA - allows operation from VIN ≥ 3.31 V, ideal for battery-powered or low-headroom supplies |
| Quiescent Current | 360 µA - enables ultra-low-power precision reference in always-on monitoring circuits |
| Enable Function | EN pin controls active/shutdown mode; active when EN ≥ VIN – 0.7 V - supports power sequencing and system-level sleep control |
Pinout & Package
SOT-23-5 (DDC) package: 2.90 mm × 1.60 mm body size, matte-tin (Sn) termination, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VBIAS | Output | Provides 1.65 V reference/bias voltage with same accuracy and drift as VREF; sinks/sources ±20 mA |
| 2 - GND | Ground | Analog ground return for both outputs; must be low-impedance connection to minimize noise coupling |
| 3 - EN | Input | Enable control: device active when voltage ≥ VIN – 0.7 V; shutdown draws ≤5 µA |
| 4 - VIN | Input | Supply input: operates from VREF + 0.02 V (≥3.32 V) to 5.5 V; supports low-dropout operation |
| 5 - VREF | Output | Primary 3.3 V reference output; identical specs to VBIAS, including tracking and regulation performance |
Key Features
| Feature | Design Value |
|---|---|
| Dual matched outputs | VREF = 3.3 V and VBIAS = 1.65 V with ≤7 ppm/°C tracking - eliminates need for external resistor divider and associated matching errors |
| e-Trim™ calibration | Post-mold trimming of both outputs ensures ±0.05% initial accuracy and low drift without laser trimming cost or yield loss |
| Low-noise performance | 12 ppmPP (0.1–10 Hz), 0.25 ppm/√Hz noise density - preserves SNR in high-resolution (≥16-bit) data acquisition systems |
| Stable capacitive loading | Operates with 0–10 µF output capacitance - simplifies layout and supports ceramic decoupling without oscillation risk |
| Robust supply rejection | ≥80 dB PSRR at 100 Hz (CL = 10 µF) - maintains output stability despite noisy or unregulated input rails |
Applications
| Electricity Meter | Analog Input Module |
|---|---|
Use Scenario: High-accuracy energy measurement using 24-bit sigma-delta ADCs with bipolar input ranges. IC Role / Device Role / Timing Role: Provides 3.3 V reference for ADC and 1.65 V mid-rail bias for current/voltage sensor front-ends. Use Value: Eliminates resistor-divider drift and mismatch, reducing total system error by up to 0.02% over temperature. | Use Scenario: Industrial PLC analog input card acquiring ±10 V or ±5 V signals with 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Supplies matched VREF and VBIAS to drive ADC reference and level-shift sensor outputs into ADC range. Use Value: Enables true bipolar acquisition from single 3.3 V supply while maintaining ±0.05% absolute accuracy. |
| Servo Drive Control Module | Clinical Digital Thermometer |
Use Scenario: Precision current sensing and position feedback conditioning in closed-loop motor controllers. IC Role / Device Role / Timing Role: Generates stable 3.3 V reference for current-sense amplifier gain setting and 1.65 V bias for differential op-amp stages. Use Value: Ensures consistent gain and offset across –40°C to 125°C ambient, critical for torque accuracy and safety compliance. | Use Scenario: High-stability temperature measurement using platinum RTD or thermistor bridges with 20-bit ADCs. IC Role / Device Role / Timing Role: Delivers ultra-low-drift 3.3 V reference and 1.65 V excitation/bias for bridge completion and ADC reference. Use Value: Reduces self-heating-induced drift and improves long-term calibration stability beyond 1000-hour test cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF2030AIDDCT | 3.0 V / 1.5 V outputs; otherwise identical specs, pinout, and performance | Used where system ADC requires 3.0 V reference (e.g., 3.0 V microcontroller interfaces) | Select when 3.0 V reference compatibility outweighs 3.3 V requirement; no PCB changes needed |
| ADR4533BRZ | Single-output 3.3 V reference only; higher initial accuracy (±0.02%), lower drift (3 ppm/°C), but no VBIAS output | Requires external precision resistor network to generate 1.65 V, increasing board area and thermal mismatch risk | Choose when ultimate drift performance is prioritized and space exists for discrete bias generation |
Compared with REF2030AIDDCT, the REF2033AIDDCT offers higher reference voltage for improved noise immunity in 3.3-V systems; compared with ADR4533BRZ, it integrates VBIAS generation to reduce component count, layout complexity, and thermal tracking error - making it optimal for compact, high-channel-count industrial DAQ modules.
Availability
REF2033AIDDCT is available at Aetrix Electronics and suitable for electricity metering, analog I/O modules, and servo drive control applications requiring stable component supply, long-term calibration integrity, and industrial temperature range support.
Supply support for REF2033AIDDCT 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 for industrial, automotive, and medical applications.
The REF20xx product line was designed specifically for high-accuracy, dual-output voltage referencing in single-supply data acquisition systems - addressing the need for matched, low-drift VREF and VBIAS without external components.
FAQ
What is the output voltage specification of the REF2033AIDDCT?
The REF2033AIDDCT provides two precisely matched outputs: VREF = 3.3 V ±0.05% and VBIAS = 1.65 V (exactly VREF/2) ±0.05%, both specified over –40°C to 125°C with ≤8 ppm/°C maximum temperature drift. These outputs share identical electrical characteristics including line/load regulation, noise, and output current capability - confirmed in TI's SBOS600E datasheet Section 7.5.
Does the REF2033AIDDCT require an external capacitor for stability?
No, the REF2033AIDDCT is internally compensated and remains stable with output capacitance from 0 µF to 10 µF, as verified in Section 7.5 of the datasheet. This allows direct use of standard 100-nF ceramic decoupling capacitors without risk of oscillation - eliminating the need for external compensation networks required by many older reference designs.
How does the enable (EN) pin function on the REF2033AIDDCT?
The EN pin on the REF2033AIDDCT controls active/shutdown mode: the device operates normally when EN voltage is ≥ VIN – 0.7 V; it enters shutdown drawing ≤5 µA when EN < 0.7 V. This threshold-based logic simplifies interface with standard GPIOs and supports robust power sequencing in multi-rail systems - detailed in Pin Functions Table (Section 6) of the SBOS600E datasheet.
Can the REF2033AIDDCT drive a 20-mA load on both outputs simultaneously?
Yes - each output (VREF and VBIAS) independently sources or sinks up to ±20 mA, as specified in Section 7.5 Electrical Characteristics. The device maintains regulation and accuracy under full load, with dropout voltage remaining ≤20 mV at 20 mA (typical 10 mV), enabling reliable operation even with marginal input headroom in battery-powered equipment.
What is the long-term stability performance of the REF2033AIDDCT?
The REF2033AIDDCT exhibits ≤25 ppm long-term stability over 1000 hours at 35°C, measured per JEDEC JESD22-A117 methodology (Section 8.2). This value reflects real-world soldered-board aging behavior and supports extended calibration intervals in field-deployed instrumentation - a key differentiator versus references lacking validated 1000-hour stability data.
REF2033AIDDCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.65V, 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 8ppm/°C
- Noise - 0.1Hz to 10Hz:
- 12ppmp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.32V ~ 5.5V
- Current - Supply:
- 460µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
REF2033AIDDCT FAQ
1.How can I place an order for REF2033AIDDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2033AIDDCT 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 REF2033AIDDCT reliable?
The price and inventory of REF2033AIDDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2033AIDDCT is usually 5 days.
3.What payment methods are accepted for REF2033AIDDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF2033AIDDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF2033AIDDCT?
REF2033AIDDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2033AIDDCT 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 REF2033AIDDCT?
For technical support, including REF2033AIDDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2033AIDDCT requirements.
6.How does Aetrix verify that REF2033AIDDCT is sourced from the original manufacturer or authorized distributors?
All REF2033AIDDCT 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 REF2033AIDDCT meets industry standards.
7.What is the process for return or replacement of REF2033AIDDCT?
All REF2033AIDDCT units undergo pre-shipment inspection (PSI). If there is an issue with REF2033AIDDCT, 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 REF2033AIDDCT part is unused and in its original packaging.
Return procedure for REF2033AIDDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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