My Inquiry
My Account
Texas Instruments REF2033AIDDCR
- Part No.:
- REF2033AIDDCR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
REF2033AIDDCR.pdf
- Description:
- IC VREF SERIES 0.05% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,136
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
REF2033AIDDCR from Texas Instruments is a dual-output, low-drift, low-power voltage reference IC delivering precise VREF = 3.3 V and VBIAS = 1.65 V outputs in a single SOT-23-5 package. It achieves ±0.05% initial accuracy, 8 ppm/°C max temperature drift (–40°C to 125°C), and 6 ppm/°C max VREF–VBIAS tracking (–40°C to 85°C), enabling high-precision biasing of bipolar ADC inputs in single-supply industrial measurement systems.
For engineers reviewing the REF2033AIDDCR datasheet, REF2033AIDDCR pinout, REF2033AIDDCR application, or REF2033AIDDCR equivalent, this device supports critical design tasks including analog input/output module calibration, electricity meter signal chain referencing, and servo drive control loop stability-where dual-rail referencing, microamp quiescent current, and sub-10-mV dropout are essential.
Technical Context
The REF2033AIDDCR implements a band-gap core with e-Trim™ post-mold calibration for both VREF and VBIAS outputs, ensuring matched initial accuracy and temperature coefficient. Its architecture uses two independent buffers-one for VREF and one for VBIAS-to maintain tight tracking (≤7 ppm/°C over –40°C to 125°C) while supporting bidirectional ±20 mA load current.
It operates from a minimum input voltage of VREF + 20 mV (3.32 V typical), enabled by ultra-low 10 mV dropout, and features enable-controlled shutdown (3.3–5 µA ICC) with 500 µs turn-on settling. Line regulation (3 ppm/V) and load regulation (8 ppm/mA) are specified identically for both outputs across full temperature and load ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Output | 3.3 V nominal; used as primary ADC reference voltage with ±0.05% initial tolerance |
| VBIAS Output | 1.65 V nominal (exactly VREF / 2); provides mid-rail bias for bipolar analog signal conditioning |
| Temp Drift (VREF/VBIAS) | ≤8 ppm/°C max (–40°C to 125°C); ensures <±0.01% output shift over full industrial range |
| VREF–VBIAS Tracking | ≤6 ppm/°C max (–40°C to 85°C); maintains <±0.005% matching between outputs for differential sensing |
| Quiescent Current | 360 µA typical (active mode); enables battery-operated field instrumentation with multi-year runtime |
| Dropout Voltage | 10 mV at 20 mA load; allows operation from 3.32 V supply-critical for low-voltage energy harvesting systems |
| Output Current | ±20 mA sourcing/sinking per output; supports direct driving of ADC reference inputs and op-amp bias networks |
Pinout & Package
SOT-23-5 (DDC) package: 2.90 mm × 1.60 mm body, matte-tin (Sn) plating, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VBIAS | Output | Provides stable 1.65 V bias voltage; identical accuracy/drift specs as VREF; sinks/sources ±20 mA |
| 2 - GND | Reference | Analog ground return for both outputs; must be low-impedance connection to minimize noise coupling |
| 3 - EN | Input | Enable control: device active when EN ≥ VIN – 0.7 V; shutdown draws ≤5 µA |
| 4 - VIN | Input | Supply input (3.32 V to 5.5 V); dropout as low as 10 mV enables use with LDOs or battery rails |
| 5 - VREF | Output | Primary 3.3 V reference output; used for ADC, DAC, or precision comparator references |
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 discrete resistor divider + buffer |
| e-Trim™ calibration | Post-package trimming of both outputs for ±0.05% initial accuracy and matched tempco-reduces system calibration overhead |
| Ultra-low dropout | 10 mV at full 20 mA load-enables operation from 3.3-V rails with margin for aging and ripple |
| Bidirectional output drive | ±20 mA capability per output-supports direct interfacing to SAR ADC reference pins and op-amp feedback networks |
| Low-noise performance | 12 ppmPP (0.1–10 Hz), 0.25 ppm/√Hz noise density-preserves SNR in 16-bit+ data acquisition systems |
Applications
| Electricity Meter | Analog Input Module |
|---|---|
Use Scenario: High-accuracy energy measurement in Class 0.2 and 0.5 smart meters under varying grid voltage and temperature. IC Role / Device Role / Timing Role: Provides VREF for 24-bit delta-sigma ADC and VBIAS for offsetting CT/PT sensor signals into ADC's bipolar input range. Use Value: Dual-output matching (≤6 ppm/°C) ensures consistent gain/offset error compensation across –40°C to 85°C, meeting IEC 62053 long-term stability requirements. |
Use Scenario: Industrial PLC analog input card acquiring ±10 V or 4–20 mA sensor signals with 16-bit resolution. IC Role / Device Role / Timing Role: Supplies VREF to ADC and VBIAS to op-amp level-shifting circuitry for unipolar-to-bipolar conversion. Use Value: ±0.05% initial accuracy and 8 ppm/°C drift reduce factory calibration frequency; 360 µA ICC lowers thermal drift in densely packed modules. |
| Servo Drive Control Module | Clinical Digital Thermometer |
Use Scenario: Closed-loop position/current control in motor drives requiring precise current sense amplifier referencing. IC Role / Device Role / Timing Role: Delivers VREF to current-sense ADC and VBIAS to bias shunt amplifier common-mode voltage at mid-rail. Use Value: 10 mV dropout allows direct use of 3.3-V system rail; ±20 mA drive eliminates external buffer, saving board space and cost. |
Use Scenario: Medical-grade handheld thermometer with thermistor or RTD front-end and low-power MCU. IC Role / Device Role / Timing Role: Generates VREF for 16-bit ADC and VBIAS for ratiometric sensor excitation and signal centering. Use Value: 360 µA quiescent current extends battery life; long-term stability (25 ppm/1000 hrs) ensures calibration validity over device lifetime. |
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 |
|---|---|---|---|
| REF2030AIDDCR | VREF = 3.0 V, VBIAS = 1.5 V; otherwise identical specs (drift, accuracy, package, pinout) | Used where 3.0-V ADC reference or lower bias voltage is required-e.g., legacy 3.0-V system rails | Select when system supply or ADC VREF requirement matches 3.0 V; pin-compatible drop-in replacement |
| REF2041AIDDCR | VREF = 4.096 V, VBIAS = 2.048 V; same accuracy/drift but higher output voltages | Preferred for 12-/16-bit SAR ADCs with 4.096-V full-scale range and ratiometric sensor interfaces | Choose for higher-resolution data acquisition; requires verification of VIN headroom (min 4.116 V) |
Compared with REF2033AIDDCR, REF2030AIDDCR offers identical performance at 3.0 V for compatibility with existing 3.0-V designs, while REF2041AIDDCR delivers higher reference voltage for improved ADC LSB resolution-both retain the same SOT-23-5 footprint, tracking, and low-power operation.
Availability
REF2033AIDDCR 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 operation.
Supply support for REF2033AIDDCR 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 voltage references and signal-chain solutions.
The REF20xx family was designed specifically for high-accuracy, dual-output referencing in single-supply industrial measurement systems-addressing the need for matched VREF/VBIAS without external components or calibration.
FAQ
What is the exact output voltage specification of REF2033AIDDCR?
The REF2033AIDDCR provides two precisely trimmed outputs: VREF = 3.300 V ±0.05% (±1.65 mV) and VBIAS = 1.650 V ±0.05% (±0.825 mV) at 25°C. Both outputs share identical initial accuracy, temperature drift (≤8 ppm/°C), and long-term stability (25 ppm over 1000 hours), as confirmed in the SBOS600E datasheet Section 7.5.
Does REF2033AIDDCR support bidirectional current on both outputs?
Yes, REF2033AIDDCR supports ±20 mA sourcing and sinking capability on both VREF and VBIAS outputs, as specified in Section 7.5 Electrical Characteristics. This enables direct interfacing with ADC reference inputs, op-amp bias networks, and current-sense amplifier common-mode circuits without external buffers.
What is the minimum input voltage required for REF2033AIDDCR to regulate properly?
The minimum input voltage for REF2033AIDDCR is VREF + 20 mV (3.32 V typical) at 20 mA load, per Section 7.3 Recommended Operating Conditions and Figure 7-28. Dropout is specified at 10 mV (max 20 mV), allowing reliable operation from standard 3.3-V supplies with margin for ripple and aging.
How does VREF–VBIAS tracking perform across temperature for REF2033AIDDCR?
REF2033AIDDCR guarantees VREF–VBIAS tracking of ≤6 ppm/°C (max) from –40°C to 85°C and ≤7 ppm/°C (max) from –40°C to 125°C, as stated in Section 7.5. This ensures the ratio remains within ±0.005% over the extended range, critical for ratiometric sensor interfaces and differential signal conditioning.
Is REF2033AIDDCR pin-compatible with other devices in the REF20xx family?
Yes, all REF20xx variants-including REF2025AIDDCR, REF2030AIDDCR, REF2033AIDDCR, and REF2041AIDDCR-share identical SOT-23-5 (DDC) pinout, electrical behavior, and functional operation. Only the output voltage values differ; no PCB layout change is needed when substituting within the family.
REF2033AIDDCR 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
REF2033AIDDCR FAQ
1.How can I place an order for REF2033AIDDCR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2033AIDDCR 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 REF2033AIDDCR reliable?
The price and inventory of REF2033AIDDCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2033AIDDCR is usually 5 days.
3.What payment methods are accepted for REF2033AIDDCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF2033AIDDCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF2033AIDDCR?
REF2033AIDDCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2033AIDDCR 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 REF2033AIDDCR?
For technical support, including REF2033AIDDCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2033AIDDCR requirements.
6.How does Aetrix verify that REF2033AIDDCR is sourced from the original manufacturer or authorized distributors?
All REF2033AIDDCR 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 REF2033AIDDCR meets industry standards.
7.What is the process for return or replacement of REF2033AIDDCR?
All REF2033AIDDCR units undergo pre-shipment inspection (PSI). If there is an issue with REF2033AIDDCR, 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 REF2033AIDDCR part is unused and in its original packaging.
Return procedure for REF2033AIDDCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF2033AIDDCR Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
