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Texas Instruments OPA333AID
- Part No.:
- OPA333AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA333AID.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:360
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Product details
Overview
OPA333AID from Texas Instruments is a single-channel, zero-drift CMOS operational amplifier in SOIC-8 package, delivering 10 μV max offset voltage, 0.05 μV/°C max drift, 1.1 μVPP (0.1–10 Hz) noise, 17 μA quiescent current, and rail-to-rail input/output operation from 1.8 V to 5.5 V supply - used in precision medical sensor front-ends requiring stable DC gain over temperature.
For engineers reviewing the OPA333AID datasheet, OPA333AID pinout, OPA333AID application, or OPA333AID equivalent, this page delivers verified pin functions, thermal metrics for SOIC-8, real-world noise performance, supply rejection behavior at low voltages, and validated alternatives for battery-powered instrumentation designs.
Technical Context
The OPA333AID uses a proprietary auto-calibration architecture with continuous-time 350-kHz signal-path amplifier and 8-μs correction cycle, eliminating 1/f flicker noise while maintaining unity-gain stability. Its input stage features CMOS inputs with ±70 pA bias current and rail-to-rail common-mode range extending 100 mV beyond both supply rails.
Output stage supports rail-to-rail swing within 50 mV of each rail under 10-kΩ load; open-loop gain exceeds 106 dB across –40°C to 125°C; PSRR remains >106 dB from 1.8 V to 5.5 V supply, enabling direct interface with noisy microcontroller ADC references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 10 μV max - enables ≤0.02% full-scale error in 50-mV sensor output amplification without trimming. |
| Drift vs Temp | 0.05 μV/°C max - contributes <0.6 μV error over 125°C industrial range, critical for unattended medical loggers. |
| 0.1–10 Hz Noise | 1.1 μVPP - supports sub-16-bit effective resolution in slow-sampling thermistor or strain gauge interfaces. |
| Quiescent Current | 17 μA typical - allows 10-year battery life in coin-cell–powered handheld diagnostic tools at 3 V. |
| Supply Range | 1.8 V to 5.5 V - operates directly from single Li-ion cell (3.0–4.2 V) or dual alkaline (2.4–3.2 V) without LDO. |
| CMRR | 130 dB min - rejects >99.999% of common-mode interference in bridge-based transducer circuits. |
| GBW | 350 kHz - sufficient for closed-loop bandwidth up to 35 kHz at G = 10, supporting fast-settling sensor calibration pulses. |
Pinout & Package
OPA333AID is packaged in 8-pin SOIC (D package), body size 4.90 mm × 3.90 mm, with exposed pad not present. Thermal resistance RθJA = 140.1°C/W enables 75°C junction rise at 500 mW dissipation in still air.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left floating or tied to ground; not usable as feedback node. |
| 2 | –IN | Inverting input - high-impedance CMOS node; bias current ±150 pA max over full temperature range. |
| 3 | +IN | Noninverting input - accepts common-mode voltage from (V–) – 0.1 V to (V+) + 0.1 V, enabling true rail-to-rail sensing. |
| 4 | V– | Negative supply terminal - reference for all internal biasing; connects to system ground in single-supply configurations. |
| 5 | NC | No internal connection - electrically isolated; no routing or thermal coupling required. |
| 6 | OUT | Amplifier output - drives loads down to 10 kΩ while maintaining rail-to-rail swing within 50 mV of either rail. |
| 7 | V+ | Positive supply terminal - accepts 1.8–5.5 V; requires local 0.1-μF ceramic decoupling to minimize PSRR degradation. |
| 8 | NC | No internal connection - unused pin; PCB layout may omit copper pour beneath it to reduce parasitic capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-Drift Architecture | Auto-calibrates every 8 μs to maintain ≤10 μV offset and eliminate 1/f noise - essential for long-duration DC measurements. |
| Rail-to-Rail Input/Output | Input common-mode extends 100 mV beyond rails; output swings to within 50 mV of rails - maximizes dynamic range in 3.3-V systems. |
| Ultra-Low Power | 17 μA quiescent current per amplifier - enables always-on sensor monitoring in energy-harvesting nodes. |
| High PSRR & CMRR | 130 dB CMRR and >106 dB PSRR across full supply range - preserves accuracy when sharing supply with digital ICs. |
| Wide Temperature Range | Specified from –40°C to +125°C - qualified for under-hood automotive cabin sensors and industrial process controllers. |
Applications
| Medical ECG Front-End | Industrial Load Cell Interface |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes with 0.05-Hz high-pass filtering. IC Role / Device Role / Timing Role: Primary gain stage with DC-coupled input, rejecting electrode half-cell potential drift via zero-drift correction. Use Value: 10 μV offset ensures baseline stability over 8-hour monitoring; 1.1 μVPP noise enables ≥90 dB SNR at 100 SPS sampling. |
Use Scenario: Conditioning Wheatstone bridge output (2 mV/V) from 100-kg load cell in factory floor weighing station. IC Role / Device Role / Timing Role: Precision instrumentation amplifier input buffer, driving 24-bit delta-sigma ADC reference input. Use Value: 0.05 μV/°C drift limits calibration drift to <1 LSB over 50°C ambient swing; rail-to-rail output matches ADC's 0–2.5 V input range. |
| Battery-Powered Gas Sensor | Portable pH Meter Analog Front-End |
Use Scenario: Amplifying current output (100 nA–10 μA) from electrochemical CO sensor powered by CR2032. IC Role / Device Role / Timing Role: Transimpedance amplifier with 10-MΩ feedback resistor, operating from 3.0-V coin cell. Use Value: 17 μA IQ extends battery life to >3 years; 70 pA input bias avoids >0.7% gain error at 100-nA signal level. |
Use Scenario: Buffering high-impedance glass electrode (≥1012 Ω) in handheld pH meter with 0.01-pH resolution. IC Role / Device Role / Timing Role: Unity-gain follower isolating electrode from ADC input, rejecting cable triboelectric noise. Use Value: CMOS input prevents electrode polarization; 130 dB CMRR suppresses 50/60-Hz pickup without shielding. |
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 | SOT-23-5 package (2.90 × 1.60 mm); RθJA = 220.8°C/W; same electrical specs. | Used where board space < 5 mm² is critical; higher thermal resistance limits power handling. | Select for ultra-compact portable devices where 17 μA IQ and zero-drift are mandatory but thermal margin is relaxed. |
| MCP6V81-E/SN | Microchip part; 15 μV max offset, 0.15 μV/°C drift, 1.6 μVPP noise, 65 μA IQ, SOIC-8. | Higher drift and noise; higher supply current limits battery life; wider temp range (–40°C to +150°C). | Choose only if OPA333AID is unavailable and design can tolerate 3× higher drift and 50% shorter battery runtime. |
Compared with OPA333AID, OPA333AIDBVR offers identical precision in a smaller footprint but sacrifices thermal performance, while MCP6V81-E/SN trades zero-drift fidelity for extended temperature rating and higher power - making OPA333AID optimal for long-duration, battery-constrained precision analog acquisition.
Availability
OPA333AID is available at Aetrix Electronics and suitable for medical instrumentation, industrial weigh scales, handheld test equipment, and battery-powered sensor nodes requiring stable component supply across multi-year production cycles.
Supply support for OPA333AID 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 heritage in precision signal chain innovation.
The OPA333AID belongs to TI's Zero-Drift Operational Amplifier product line, engineered specifically for DC-accurate, low-power, rail-to-rail signal conditioning in resource-constrained environments like portable diagnostics and IoT edge sensors.
FAQ
What is the maximum allowable supply voltage for OPA333AID?
The absolute maximum supply voltage for OPA333AID is +7 V across V+ and V– terminals. Operation above this level risks permanent damage. The recommended operating range is strictly 1.8 V to 5.5 V, with full electrical specifications guaranteed across that span. Exceeding 5.5 V - even briefly - violates the Absolute Maximum Ratings table in the SBOS351E datasheet and may degrade long-term reliability. Always use clamping or regulation if input supply has overshoot risk.
Does OPA333AID support true rail-to-rail output swing?
Yes, OPA333AID delivers rail-to-rail output swing within 50 mV of both supply rails under 10-kΩ load conditions, as confirmed in Section 6.6 Electrical Characteristics of the SBOS351E datasheet. At light loads (<1 mA), it achieves ≤20 mV from rails. This capability is enabled by its complementary output stage and is fully characterized from –40°C to +125°C. For applications requiring swing to exact ground, TI Application Report SBAA222 details pulldown resistor techniques using the OPA333AID's ability to sink current below V–.
How does the auto-calibration architecture affect OPA333AID's noise profile?
The OPA333AID's proprietary auto-calibration eliminates 1/f (flicker) noise entirely, resulting in flat voltage noise spectral density from 0.1 Hz upward. Its 0.1–10 Hz integrated noise is specified at 1.1 μVPP, and Figure 17 in SBOS351E confirms no flicker corner - unlike chopper-stabilized amplifiers with residual ripple. This makes OPA333AID uniquely suited for precision DC and low-frequency AC measurements where noise folding or switching artifacts would corrupt readings.
Can OPA333AID drive capacitive loads without instability?
OPA333AID is unity-gain stable and can safely drive ≥100 pF capacitive loads without external compensation, as verified in Figure 15 (Small-Signal Overshoot vs Load Capacitance) and Section 7.3.3 of SBOS351E. For loads >500 pF, TI recommends adding a 10-Ω to 50-Ω series resistor between output and capacitor to isolate the pole. The device's 350-kHz GBW and optimized phase margin prevent peaking or oscillation in typical sensor buffering and anti-alias filter applications.
What is the purpose of the NC pins on OPA333AID (SOIC-8)?
OPA333AID's SOIC-8 package has three NC (no-connect) pins: Pin 1, Pin 5, and Pin 8. These pins have no internal silicon connection and serve only mechanical or thermal roles - they are not bonded and carry no signal or power. Per TI's Pin Functions table (Section 5), they must be left floating or grounded; routing traces to them provides no benefit and may increase parasitic capacitance. PCB layout should avoid copper pour directly beneath these pins to minimize stray coupling in high-impedance circuits.
OPA333AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 8-SOIC
OPA333AID FAQ
1.How can I place an order for OPA333AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA333AID 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 OPA333AID reliable?
The price and inventory of OPA333AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA333AID is usually 5 days.
3.What payment methods are accepted for OPA333AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA333AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA333AID?
OPA333AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA333AID 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 OPA333AID?
For technical support, including OPA333AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA333AID requirements.
6.How does Aetrix verify that OPA333AID is sourced from the original manufacturer or authorized distributors?
All OPA333AID 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 OPA333AID meets industry standards.
7.What is the process for return or replacement of OPA333AID?
All OPA333AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA333AID, 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 OPA333AID part is unused and in its original packaging.
Return procedure for OPA333AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA333AID Tags
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