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Texas Instruments OPA333AIDCKT
- Part No.:
- OPA333AIDCKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA333AIDCKT.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,941
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Product details
Overview
OPA333AIDCKT from Texas Instruments is a single, zero-drift CMOS operational amplifier in SC70-5 package, delivering 10 μV max offset voltage, 0.05 μV/°C max drift, and 17 μA quiescent current. It operates from 1.8 V to 5.5 V with rail-to-rail input/output, enabling precision signal conditioning in battery-powered medical sensors and electronic scales.
For engineers reviewing the OPA333AIDCKT datasheet, OPA333AIDCKT pinout, OPA333AIDCKT application, or OPA333AIDCKT equivalent, this page provides verified pin functions, thermal metrics for SC70-5, noise performance (1.1 μVPP, 0.1–10 Hz), supply rejection (130 dB CMRR), and validated alternative options for low-power precision amplification.
Technical Context
The OPA333AIDCKT employs a proprietary auto-calibration architecture that corrects input offset every 8 μs using a continuous-time 350-kHz signal-path amplifier-eliminating flicker noise and aliasing while maintaining unity-gain stability. Its input stage supports common-mode voltage from (V−) − 0.1 V to (V+) + 0.1 V, and output swings within 50 mV of both rails.
This architecture enables stable operation in high-impedance sensor interfaces without phase reversal, even under mismatched load conditions. The SC70-5 package features a thermal resistance (RθJA) of 298.4°C/W and junction-to-board (RθJB) of 97.1°C/W, requiring careful PCB copper area design for thermal management in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 10 μV maximum - ensures ≤0.02% error in 50-mV full-scale transducer outputs at room temperature |
| Offset Drift | 0.05 μV/°C maximum - guarantees <0.5 μV total drift over −40°C to +125°C industrial range |
| Supply Range | 1.8 V to 5.5 V - supports direct Li-ion (3.0–3.7 V) and dual AA (2.4–3.2 V) battery operation without regulation |
| Quiescent Current | 17 μA typical - enables >1-year runtime in 10-μA average-power handheld instruments |
| 0.1–10 Hz Noise | 1.1 μVPP - preserves resolution in 24-bit ΔΣ ADC front-ends measuring sub-μV thermocouple signals |
| CMRR | 130 dB minimum - rejects >1000:1 common-mode interference in unshielded PCB traces near switching regulators |
| Gain-Bandwidth | 350 kHz - sufficient for DC–100-Hz sensor bandwidth with ≥20 dB phase margin into 100-pF capacitive loads |
Pinout & Package
OPA333AIDCKT uses the SC70-5 (DCK) package: 2.00 mm × 1.25 mm body, 0.65 mm pitch, 5-terminal leadframe with exposed die pad recommended to be connected to V− or left floating per TI guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +IN | Noninverting input - high-impedance CMOS node; must be guarded against leakage paths in humid environments |
| 2 | −IN | Inverting input - matched to +IN for optimal CMRR; avoid asymmetric trace lengths to prevent thermoelectric offsets |
| 3 | OUT | Output - rail-to-rail swing capable; drives 10-kΩ loads to within 50 mV of rails; stable with ≥100-pF capacitive loads |
| 4 | V− | Negative supply - lowest potential rail; connects to PCB ground plane or negative bias; thermal pad ties here if used |
| 5 | V+ | Positive supply - highest potential rail; requires local 0.1-μF ceramic decoupling within 2 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-calibration | Continuous 350-kHz correction cycle eliminates 1/f noise and holds offset drift ≤0.05 μV/°C across full temp range |
| Rail-to-rail I/O | Input extends 100 mV beyond supplies; output swings to within 50 mV of rails - enables true single-supply 0–5 V signal chains |
| Ultra-low power | 17 μA IQ allows integration into energy-harvesting nodes where average current budget is <20 μA |
| High CMRR without crossover | 130 dB min avoids distortion in differential sensor bridges when common-mode voltage shifts during measurement |
| ESD robustness | ±4000-V HBM rating - survives handling in Class 1B ESD environments without additional protection circuitry |
Applications
| Medical Temperature Sensing | Electronic Weighing Scale |
|---|---|
Use Scenario: Amplifying output of a 100-Ω Pt100 RTD in a portable thermometer with 0.1°C resolution requirement. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with 1.1 μVPP low-frequency noise and 10 μV offset to preserve microvolt-level bridge imbalances. Use Value: Enables direct interface to 24-bit ΣΔ ADC without external trimming; 0.05 μV/°C drift contributes <0.006°C error over −20°C to +50°C operating range. |
Use Scenario: Conditioning mV-level output from a 350-Ω strain gauge load cell in a handheld scale with 1 g resolution. IC Role / Device Role / Timing Role: Low-drift, low-noise gain stage before 20-bit ADC; rail-to-rail output ensures full dynamic range utilization with 3.3-V supply. Use Value: 10 μV offset translates to <0.5 g error on 10-kg scale; 17 μA quiescent current extends battery life to >18 months at 1-sample/sec duty cycle. |
| Battery-Powered pH Meter | Handheld Multimeter Input Stage |
Use Scenario: Buffering high-impedance glass electrode (≥1 GΩ) in a field-deployable pH meter operating from two AA cells. IC Role / Device Role / Timing Role: Unity-gain buffer with 70 pA input bias current and rail-to-rail input to capture full ±400-mV pH range without level-shifting. Use Value: Input bias current generates <0.4 mV error across 1-GΩ source impedance - 4× lower than standard CMOS op-amps, preserving 0.01-pH accuracy. |
Use Scenario: First-stage amplifier in autoranging DMM measuring µV–V signals with 6½-digit resolution. IC Role / Device Role / Timing Role: Zero-drift gain block for nanovolt-level thermocouple measurements; immune to thermal gradients during manual probe handling. Use Value: Eliminates need for periodic null calibration; 1.1 μVPP 0.1–10 Hz noise sets floor for 100-nV RMS resolution in 1-sec integration mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Same silicon, SOT-23-5 package (2.90 mm × 1.60 mm); RθJA = 220.8°C/W vs 298.4°C/W for SC70 | Better thermal performance in space-constrained PCBs with limited copper area; slightly larger footprint | Select when board layout allows SOT-23 and thermal dissipation >15 mW is required at 125°C ambient |
| MCP6V81T-E/OT | Microchip zero-drift op-amp; 2 μV max offset, 15 μA IQ, but only specified to 125°C (not 125°C continuous) | Lower offset improves DC accuracy in lab-grade equipment; lacks extended temperature validation for automotive under-hood use | Choose for cost-sensitive consumer test gear where −40°C to +125°C continuous operation is not required |
Compared with OPA333AIDCKT, the OPA333AIDBVR offers superior thermal resistance in a slightly larger package, while the MCP6V81T-E/OT trades guaranteed 125°C operation for lower initial offset-making the OPA333AIDCKT optimal for industrial sensors needing long-term stability across extreme temperatures.
Availability
OPA333AIDCKT is available at Aetrix Electronics and suitable for battery-powered instrumentation, medical diagnostics equipment, and precision weighing systems requiring stable component supply with full traceability and lifecycle continuity.
Supply support for OPA333AIDCKT 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 with core expertise in analog ICs, embedded processors, and high-reliability power management solutions.
The OPA333AIDCKT belongs to TI's Zero-Drift Operational Amplifier product line, engineered specifically for ultra-precision, low-power signal conditioning in portable and industrial sensing applications where offset stability over temperature and time is critical.
FAQ
What is the maximum operating temperature range for OPA333AIDCKT?
The OPA333AIDCKT is fully specified from −40°C to +125°C for continuous operation, with storage temperature rated to +150°C. Its zero-drift architecture maintains 10 μV max offset and 0.05 μV/°C max drift across this full industrial range, making it suitable for under-hood automotive sensors and factory-floor instrumentation where ambient heat exceeds 85°C.
Does OPA333AIDCKT require external compensation for unity-gain stability?
No, the OPA333AIDCKT is inherently unity-gain stable and does not require external compensation components. Its internal compensation ensures ≥20 dB phase margin into 100-pF capacitive loads, supporting direct driving of ADC input capacitors and long PCB traces without oscillation-verified in TI's SBOS351E datasheet Figure 11 small-signal step response.
Can OPA333AIDCKT drive capacitive loads up to 1 nF?
The OPA333AIDCKT is characterized for stability with up to 100 pF directly at the output. Driving 1 nF loads requires an isolation resistor (typically 10–100 Ω) between the op-amp output and the capacitor to maintain phase margin; TI recommends verifying stability via transient simulation or bench testing when exceeding 100 pF, as large capacitive loads degrade slew rate and increase settling time.
How does the auto-calibration circuit in OPA333AIDCKT affect system noise?
The OPA333AIDCKT's auto-calibration eliminates 1/f (flicker) noise entirely, resulting in flat voltage noise spectral density down to 0.01 Hz. This yields 1.1 μVPP integrated noise from 0.1 Hz to 10 Hz-critical for precision DC measurements-and avoids the noise modulation artifacts seen in chopper-stabilized amplifiers, as confirmed in SBOS351E Figure 17.
Is the exposed thermal pad on OPA333AIDCKT's SC70-5 package electrically connected?
No, the exposed thermal pad on the OPA333AIDCKT SC70-5 (DCK) package is not electrically connected to any internal node. TI documentation specifies it may be soldered to V− or left unconnected-no internal short exists. Thermal performance improves by 20–30% when tied to a V− copper pour, but electrical isolation is maintained regardless of connection choice.
OPA333AIDCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.16V/µs
- Gain Bandwidth Product:
- 350 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 70 pA
- Voltage - Input Offset:
- 2 µV
- Current - Supply:
- 17µA
- Current - Output / Channel:
- 5 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
OPA333AIDCKT FAQ
1.How can I place an order for OPA333AIDCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA333AIDCKT 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 OPA333AIDCKT reliable?
The price and inventory of OPA333AIDCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA333AIDCKT is usually 5 days.
3.What payment methods are accepted for OPA333AIDCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA333AIDCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA333AIDCKT?
OPA333AIDCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA333AIDCKT 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 OPA333AIDCKT?
For technical support, including OPA333AIDCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA333AIDCKT requirements.
6.How does Aetrix verify that OPA333AIDCKT is sourced from the original manufacturer or authorized distributors?
All OPA333AIDCKT 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 OPA333AIDCKT meets industry standards.
7.What is the process for return or replacement of OPA333AIDCKT?
All OPA333AIDCKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA333AIDCKT, 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 OPA333AIDCKT part is unused and in its original packaging.
Return procedure for OPA333AIDCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA333AIDCKT Tags
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