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Texas Instruments OPA333AIDR
- Part No.:
- OPA333AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA333AIDR.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,773
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Product details
Overview
OPA333AIDR 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 maximum drift, and 17 μA quiescent current across 1.8 V to 5.5 V supply, enabling high-accuracy signal conditioning in battery-powered medical sensors and electronic scales.
For engineers reviewing the OPA333AIDR datasheet, OPA333AIDR pinout, OPA333AIDR application, or OPA333AIDR equivalent, key selection criteria include its auto-calibrated architecture eliminating 1/f noise, guaranteed rail-to-rail output swing within 50 mV of rails, –40°C to 125°C operating range, and SOT23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The OPA333AIDR employs a proprietary auto-calibration technique that corrects input offset every 8 μs using a time-continuous 350-kHz signal-path amplifier, achieving near-zero drift without aliasing or flicker noise. Its CMOS input stage provides 70 pA typical input bias current and supports common-mode voltage from (V–) – 0.1 V to (V+) + 0.1 V.
This architecture enables stable unity-gain operation with 350 kHz gain-bandwidth product and 0.16 V/μs slew rate while maintaining 130 dB open-loop gain and 130 dB CMRR at DC. The device is free from output phase reversal and features internal ESD protection rated at ±4000 V HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 10 μV max - ensures ≤0.02% error in 50-mV full-scale sensor outputs without trimming |
| Drift vs Temperature | 0.05 μV/°C max - maintains <1 μV total drift over industrial temperature range (–40°C to 125°C) |
| Supply Range | 1.8 V to 5.5 V - supports direct connection to Li-ion, coin-cell, or 3.3-V logic rails without regulation |
| Quiescent Current | 17 μA - enables >1-year battery life in 10-μA sleep-mode handheld instruments |
| Input Common-Mode Range | (V–) – 0.1 V to (V+) + 0.1 V - accepts signals beyond rails for robust interfacing with transducers |
| Output Swing | Within 50 mV of both rails - delivers full dynamic range into ADCs with 0–V reference inputs |
| 0.1-Hz to 10-Hz Noise | 1.1 μVPP - preserves resolution in DC-coupled thermocouple or strain-gauge amplifiers |
Pinout & Package
SOT23-5 package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Positive power supply | Highest potential rail; must be decoupled with 0.1-μF capacitor placed ≤2 mm from pin |
| 2 - IN− | Inverting input | Differential node for feedback networks; matched layout critical to minimize thermoelectric offset |
| 3 - IN+ | Noninverting input | High-impedance sensor interface point; accepts voltages 100 mV beyond supply rails |
| 4 - V− | Negative power supply | Lowest potential rail; connects to system ground or negative supply in dual-rail configurations |
| 5 - OUT | Amplifier output | Rail-to-rail capable stage; drives 10-kΩ loads while maintaining 50-mV headroom to rails |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-calibration | Continuous 8-μs correction cycle eliminates aging and thermal drift without introducing switching artifacts |
| Rail-to-rail I/O | Full input range and output swing enable single-supply operation with no level-shifting circuitry |
| Ultra-low quiescent current | 17 μA per amplifier allows integration into always-on sensor nodes without compromising battery life |
| No phase reversal | Guaranteed stable polarity under common-mode overload conditions prevents system latch-up |
| High PSRR & CMRR | 130 dB at DC rejects supply ripple and noise coupling in noisy embedded environments |
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 front-end amplifier conditioning biopotential signals prior to 24-bit delta-sigma ADC sampling. Use Value: 10 μV offset and 0.05 μV/°C drift ensure diagnostic-grade accuracy across body-temperature variations without recalibration. | Use Scenario: Reading bridge outputs from load cells in retail or industrial weighing platforms. IC Role / Device Role / Timing Role: Low-noise, low-drift gain stage converting mV-level differential signals into ratiometric ADC inputs. Use Value: 1.1 μVPP 0.1–10 Hz noise and rail-to-rail output maximize effective resolution of 20-bit weigh-scale ADCs. |
| Battery-Powered Instruments | Temperature Measurements |
Use Scenario: Signal conditioning in handheld multimeters and insulation testers operating from AA batteries. IC Role / Device Role / Timing Role: Core amplifier in autoranging voltage/current measurement paths with programmable gain. Use Value: 1.8-V minimum supply and 17 μA IQ enable continuous operation for >500 hours on two alkaline cells. | Use Scenario: Linearizing and amplifying outputs from RTDs and thermistors in HVAC control units. IC Role / Device Role / Timing Role: Precision buffer and gain stage driving SAR ADCs in closed-loop temperature regulation. Use Value: Input common-mode range extending 100 mV beyond rails accommodates self-heating compensation circuits without external biasing. |
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, SC70-5 package (2.00 mm × 1.25 mm); 298.4°C/W θJA vs 220.8°C/W for SOT23-5 | Higher thermal resistance limits continuous output current in high-ambient environments | Select when board area is constrained and thermal load is light (e.g., sensor buffering only) |
| LTC2050CS5#TRMPBF | 1.5 μV max offset, 0.015 μV/°C drift, but 55 μA IQ and 1.8–5.5 V supply; SOIC-5 package | Lower drift suits ultra-high-precision lab equipment; higher IQ precludes long-life battery use | Select when sub-microvolt stability outweighs power budget, and SOIC-5 footprint is acceptable |
Compared with OPA333AIDR, OPA333AIDBVR offers identical electrical performance in a smaller footprint but requires tighter thermal management, while LTC2050CS5#TRMPBF trades 3× higher quiescent current for 6× lower drift-making it suitable for mains-powered metrology but not portable instrumentation.
Availability
OPA333AIDR 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 production lifecycles.
Supply support for OPA333AIDR 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 delivering analog and embedded processing solutions, with leadership in precision analog ICs since 1930.
The OPA333AIDR belongs to TI's Zero-Drift Operational Amplifier product line, designed specifically for high-accuracy, low-power signal conditioning in sensor interfaces, portable test equipment, and industrial process control systems.
FAQ
What is the maximum operating temperature range specified for the OPA333AIDR?
The OPA333AIDR is fully specified from –40°C to +125°C ambient temperature, with junction temperature limited to 150°C. This range is validated across all electrical parameters including offset voltage drift, CMRR, and open-loop gain, making OPA333AIDR suitable for under-hood automotive and industrial control applications where thermal stability is critical.
Does the OPA333AIDR require external capacitors for stability in unity-gain configuration?
No, the OPA333AIDR is unity-gain stable and does not require external compensation capacitors. Its internal design ensures phase margin >60° at unity gain with capacitive loads up to 100 pF. However, a 0.1-μF ceramic decoupling capacitor must be placed within 2 mm of the V+ and V− pins to maintain PSRR and prevent oscillation from supply impedance.
Can the OPA333AIDR drive ADC inputs directly without additional buffering?
Yes, the OPA333AIDR can directly drive SAR and delta-sigma ADC inputs due to its rail-to-rail output swing (within 50 mV of rails), low output impedance (<2 kΩ at 350 kHz), and 130 dB CMRR. For 16-bit+ ADCs, ensure layout minimizes thermoelectric offsets by matching trace lengths and materials on IN+ and IN− paths to preserve OPA333AIDR's 10 μV offset advantage.
How does the auto-calibration architecture of the OPA333AIDR affect noise performance?
The OPA333AIDR's auto-calibration eliminates 1/f (flicker) noise entirely, resulting in flat voltage noise spectral density above 0.1 Hz and 1.1 μVPP integrated noise from 0.1 Hz to 10 Hz. Unlike chopper-stabilized amplifiers, this architecture introduces no switching artifacts or intermodulation distortion, preserving signal integrity in precision DC and low-frequency AC measurements using the OPA333AIDR.
Is the OPA333AIDR pin-compatible with other SOT23-5 op-amps like the TLV2461 or MCP6001?
No, the OPA333AIDR uses a nonstandard SOT23-5 pinout: Pin 1 = V+, Pin 2 = IN−, Pin 3 = IN+, Pin 4 = V−, Pin 5 = OUT. TLV2461 and MCP6001 follow different assignments (e.g., V− on Pin 1). Swapping them without PCB revision causes immediate functional failure. Always verify pin mapping using the OPA333AIDR datasheet Figure 5 before layout or replacement.
OPA333AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
OPA333AIDR FAQ
1.How can I place an order for OPA333AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA333AIDR 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 OPA333AIDR reliable?
The price and inventory of OPA333AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA333AIDR is usually 5 days.
3.What payment methods are accepted for OPA333AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA333AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA333AIDR?
OPA333AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA333AIDR 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 OPA333AIDR?
For technical support, including OPA333AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA333AIDR requirements.
6.How does Aetrix verify that OPA333AIDR is sourced from the original manufacturer or authorized distributors?
All OPA333AIDR 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 OPA333AIDR meets industry standards.
7.What is the process for return or replacement of OPA333AIDR?
All OPA333AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA333AIDR, 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 OPA333AIDR part is unused and in its original packaging.
Return procedure for OPA333AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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