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Texas Instruments OPA333AIDG4
- Part No.:
- OPA333AIDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA333AIDG4.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,592
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Product details
Overview
OPA333AIDG4 from Texas Instruments is a single, zero-drift, rail-to-rail input/output CMOS operational amplifier optimized for precision low-voltage operation. It delivers 10 μV maximum offset voltage, 0.05 μV/°C max drift, 17 μA quiescent current, and operates from 1.8 V to 5.5 V - enabling high-accuracy signal conditioning in battery-powered medical sensors and electronic scales.
For engineers reviewing the OPA333AIDG4 datasheet, OPA333AIDG4 pinout, OPA333AIDG4 application, or OPA333AIDG4 equivalent, key selection criteria include its auto-calibrated architecture eliminating 1/f noise, guaranteed rail-to-rail input beyond rails by ±100 mV, output swing within 50 mV of rails, and SOT23-5 packaging suitable for space-constrained portable instrumentation.
Technical Context
The OPA333AIDG4 employs a proprietary continuous-time auto-calibration architecture with a 350-kHz main amplifier core, zero-corrected every 8 μs, delivering true zero-drift performance without aliasing or flicker noise. Its input stage uses CMOS transistors with ultra-low bias current (±200 pA max) and extended common-mode range (V– – 0.1 V to V+ + 0.1 V).
The output stage supports rail-to-rail swing (within 50 mV of each rail at 10 kΩ load) and is unity-gain stable. Internal protection includes ESD ratings of ±4000 V HBM and ±1000 V CDM, with absolute maximum supply voltage of +7 V - exceeding its 1.8–5.5 V operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 10 μV max - enables sub-0.01% dc accuracy in 12-bit+ sensor front-ends without trimming. |
| Offset Drift | 0.05 μV/°C max - ensures <1 μV total drift over –40°C to +125°C, critical for unattended industrial monitoring. |
| Supply Range | 1.8 V to 5.5 V - supports direct Li-ion (3.0–4.2 V), coin-cell (1.8–3.0 V), and 3.3 V/5 V systems without LDO. |
| Quiescent Current | 17 μA typ - allows >1-year battery life in always-on handheld test equipment with 200 mAh cells. |
| 0.1–10 Hz Noise | 1.1 μVPP - provides clean dc-coupled amplification for thermocouple and strain gauge outputs. |
| CMRR | 130 dB min - rejects common-mode interference in noisy industrial environments with long sensor cables. |
| GBW | 350 kHz - sufficient for anti-alias filtering and closed-loop gain ≤100 in precision data acquisition. |
Pinout & Package
SOT23-5 package (2.90 mm × 1.60 mm body size) with exposed pad not present; thermal resistance RθJA = 140.1°C/W (SOIC-8 reference), RθJB = 80.6°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NC | No internal connection | Must be left floating or tied to ground; no routing or decoupling required. |
| 2 - –IN | Inverting input | Differential node for feedback networks; accepts common-mode voltages down to V– – 0.1 V. |
| 3 - +IN | Noninverting input | High-impedance (≥10¹³ Ω) sensor interface node; immune to leakage-induced offset errors. |
| 4 - V– | Negative supply rail | Reference for all internal biasing; must be connected even in single-supply configurations (e.g., 0 V). |
| 5 - V+ | Positive supply rail | Power source for internal calibration circuitry; requires local 0.1 μF ceramic decoupling per TI layout guidelines. |
| 6 - OUT | Amplifier output | Capable of sourcing/sinking ≥5 mA; swings within 50 mV of V– and V+ under 10 kΩ load. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Auto-calibrates every 8 μs to eliminate time/temperature drift - no external nulling or periodic recalibration needed. |
| Rail-to-rail input | Operates with inputs 100 mV beyond supply rails - enables direct interfacing to resistive bridges and thermistors without level-shifting. |
| Ultra-low power | 17 μA quiescent current at 5 V - reduces self-heating to <0.1°C rise, preserving offset stability in sealed enclosures. |
| No 1/f noise | Flat voltage noise spectral density from 0.1 Hz - eliminates low-frequency drift in precision weighing and pH measurement. |
| Unity-gain stable | Guaranteed phase margin >60° at G = 1 - simplifies design of buffer, follower, and active filter stages without compensation. |
Applications
| Medical Instrumentation | Electronic Scales |
|---|---|
Use Scenario: Amplifying microvolt-level signals from ECG electrodes in portable patient monitors. IC Role / Device Role / Timing Role: Precision dc-coupled front-end amplifier with ultra-low offset and drift to preserve ST-segment morphology. Use Value: 10 μV offset ensures baseline stability over 24-hour recordings; 1.1 μVPP 0.1–10 Hz noise prevents false arrhythmia detection. |
Use Scenario: Conditioning output of load-cell bridges in digital kitchen or industrial platform scales. IC Role / Device Role / Timing Role: Low-noise, low-drift gain stage before 24-bit sigma-delta ADC. Use Value: 0.05 μV/°C drift limits temperature-induced error to <0.005% FS over –10°C to +40°C ambient range. |
| Battery-Powered Instruments | Temperature Measurements |
Use Scenario: Signal conditioning for thermistor-based temperature logging in wireless IoT nodes. IC Role / Device Role / Timing Role: Rail-to-rail input/output amplifier powering ADC reference and sensor excitation from same 3.3 V rail. Use Value: 17 μA IQ extends CR2032 battery life to >2 years in 1-minute sampling intervals; 1.8 V operation enables full functionality down to end-of-life voltage. |
Use Scenario: Amplifying RTD (Pt100) bridge outputs in HVAC control panels with wide ambient temperature range. IC Role / Device Role / Timing Role: Precision instrumentation amplifier input stage rejecting common-mode noise on long sensor wires. Use Value: 130 dB CMRR suppresses 50/60 Hz pickup from adjacent AC wiring; rail-to-rail input accommodates 0–100°C linearization circuits. |
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 | SOT23-5 package with identical electrical specs; differs only in tape-and-reel packaging (DBVR vs DG4) and RoHS compliance status. | No functional difference; both rated for –40°C to +125°C operation and share identical pinout and thermal metrics. | Select OPA333AIDBVR for automated SMT assembly requiring 3000-unit reels; OPA333AIDG4 is tube-packaged for prototyping or low-volume production. |
| MCP6V81T-E/OT | Microchip's zero-drift op-amp: 25 μV max offset, 0.15 μV/°C drift, 650 kHz GBW, 1.6 V to 5.5 V supply - higher bandwidth but looser dc specs. | Acceptable for medium-precision applications (e.g., basic sensor buffering) where 0.025% offset error is tolerable. | Choose MCP6V81T-E/OT only if bandwidth >350 kHz is required and dc accuracy can be relaxed; OPA333AIDG4 remains superior for <0.01% error budgets. |
Compared with OPA333AIDG4, OPA333AIDBVR offers identical performance in a different packaging format ideal for volume manufacturing, while MCP6V81T-E/OT trades dc precision for higher speed - making OPA333AIDG4 the optimal choice for applications demanding sub-10 μV offset and minimal thermal drift.
Availability
OPA333AIDG4 is available at Aetrix Electronics and suitable for medical instrumentation, electronic scales, and battery-powered instruments requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for OPA333AIDG4 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 amplifiers and signal-chain solutions.
The OPA333AIDG4 belongs to TI's Zero-Drift Series, designed specifically for high-accuracy, low-power, single-supply applications in portable medical devices, industrial sensing, and precision measurement systems.
FAQ
What is the maximum supply voltage rating for the OPA333AIDG4?
The OPA333AIDG4 has an absolute maximum supply voltage of +7 V, as specified in Section 6.1 of the SBOS351E datasheet. Exceeding this voltage - even momentarily - may cause permanent damage. Its recommended operating range remains 1.8 V to 5.5 V, and operation above 5.5 V voids parametric guarantees. Always use appropriate overvoltage protection when interfacing with unregulated sources.
Does the OPA333AIDG4 require external capacitors for stability?
No, the OPA333AIDG4 is unity-gain stable and does not require external compensation capacitors. However, TI strongly recommends placing a 0.1 μF ceramic decoupling capacitor between V+ and V– pins, located within 2 mm of the device, to suppress high-frequency noise and ensure robust operation with noisy power supplies - especially in battery-powered instrumentation where supply impedance rises at high frequencies.
Can the OPA333AIDG4 drive capacitive loads directly?
The OPA333AIDG4 is characterized to drive up to 100 pF capacitive loads without oscillation, as confirmed in Figure 15 (Small-Signal Overshoot vs Load Capacitance) of the SBOS351E datasheet. For loads exceeding 100 pF - such as ADC input capacitance plus PCB trace capacitance - add a small series resistor (e.g., 10–50 Ω) between the OPA333AIDG4 output and the load to maintain phase margin and prevent peaking or ringing.
Is the OPA333AIDG4 pin-compatible with other SOT23-5 op-amps?
The OPA333AIDG4 follows the industry-standard SOT23-5 pinout (V+, –IN, +IN, V–, OUT), matching TI's OPAx322, OPAx344, and many third-party rail-to-rail op-amps. However, due to its unique zero-drift architecture and low-IQ design, direct substitution may affect offset, noise, or power consumption - verify system-level performance including startup time (100 μs turn-on) and ESD behavior (±4000 V HBM) before replacement.
How does the auto-calibration architecture of the OPA333AIDG4 impact signal integrity?
The OPA333AIDG4's auto-calibration occurs continuously every 8 μs using a dedicated correction path, resulting in zero observable switching artifacts or intermodulation distortion in the signal band. Unlike chopper-stabilized amplifiers, it exhibits flat 1/f-noise-free voltage noise down to 0.1 Hz - preserving dc fidelity in thermocouple and strain gauge measurements without introducing spurious tones or settling delays.
OPA333AIDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
OPA333AIDG4 FAQ
1.How can I place an order for OPA333AIDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA333AIDG4 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 OPA333AIDG4 reliable?
The price and inventory of OPA333AIDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA333AIDG4 is usually 5 days.
3.What payment methods are accepted for OPA333AIDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA333AIDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA333AIDG4?
OPA333AIDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA333AIDG4 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 OPA333AIDG4?
For technical support, including OPA333AIDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA333AIDG4 requirements.
6.How does Aetrix verify that OPA333AIDG4 is sourced from the original manufacturer or authorized distributors?
All OPA333AIDG4 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 OPA333AIDG4 meets industry standards.
7.What is the process for return or replacement of OPA333AIDG4?
All OPA333AIDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA333AIDG4, 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 OPA333AIDG4 part is unused and in its original packaging.
Return procedure for OPA333AIDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA333AIDG4 Tags
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LM358DT
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