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Texas Instruments OPA335AIDR
- Part No.:
- OPA335AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA335AIDR.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,110
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Product details
Overview
OPA335AIDR from Texas Instruments is a single-channel, zero-drift CMOS operational amplifier in SO-8 package, featuring 5 µV max input offset voltage, 0.05 µV/°C max offset drift, 285 µA quiescent current, rail-to-rail output swing, and operation from +2.7 V to +5.5 V. It is optimized for precision transducer signal conditioning in battery-powered instrumentation.
For engineers reviewing the OPA335AIDR datasheet, OPA335AIDR pinout, OPA335AIDR application, or OPA335AIDR equivalent, key selection criteria include ultra-low drift performance at extended temperature range (–40°C to +125°C), single-supply compatibility down to 2.7 V, and verified rail-to-rail output capability under 10 kΩ load.
Technical Context
The OPA335AIDR employs auto-zeroing architecture with a time-continuous 2 MHz main amplifier corrected every 100 µs, enabling near-zero drift without chopper-induced switching artifacts. Its input stage uses CMOS technology for ultra-low input bias current (±70 pA typ) and high input impedance.
It supports unity-gain stable operation with 2 MHz gain-bandwidth product and 1.6 V/µs slew rate, and delivers rail-to-rail output swing within 15 mV of each rail at 10 kΩ load across –40°C to +125°C. The device lacks shutdown functionality-distinct from the OPA334 family-and is specified for continuous operation only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 5 µV (max) - enables sub-10 µV system-level offset error in precision sensor front-ends without trimming. |
| Offset Drift | 0.05 µV/°C (max) - ensures <0.6 µV total drift over 125°C temperature span, critical for unattended industrial measurement. |
| Quiescent Current | 285 µA - allows >1-year battery life in handheld test equipment operating from 2 × AA cells. |
| Supply Voltage Range | +2.7 V to +5.5 V - supports direct interface with 3.3 V and 5 V logic rails and low-voltage ADC references. |
| Gain-Bandwidth Product | 2 MHz - sufficient for closed-loop gains up to 200 at 10 kHz while maintaining phase margin >60°. |
| Output Swing | Rail-to-rail, within 15 mV of rails (10 kΩ load) - permits full-scale utilization of 16-bit SAR ADC input range. |
| Common-Mode Rejection | 110 dB (min) - rejects >100,000:1 of power supply ripple and EMI-coupled noise in noisy environments. |
Pinout & Package
OPA335AIDR is housed in an 8-pin SOIC (D) package per JEDEC MS-012, with standard 1.27 mm pitch, 3.9 mm × 4.9 mm body, and exposed pad not present. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must remain unconnected; floating or tied to ground degrades PSRR. |
| 2 | Inverting Input (–In) | Differential input node with ±70 pA bias current; requires matched trace impedance for optimal CMRR. |
| 3 | Non-Inverting Input (+In) | Differential input node referenced to V–; common-mode range extends to (V+) – 1.5 V. |
| 4 | V– | Negative supply terminal - must be decoupled with 0.1 µF ceramic capacitor placed ≤2 mm from pin. |
| 5 | Output (Out) | Rail-to-rail output capable of sourcing/sinking ±50 mA; drives 10 kΩ load to within 15 mV of rails. |
| 6 | NC | No internal connection - electrically isolated; avoid routing signals adjacent to minimize coupling. |
| 7 | NC | No internal connection - unused silicon pad; leave unconnected per TI layout guidelines. |
| 8 | V+ | Positive supply terminal - shares same decoupling requirement as V–; supports 2.7–5.5 V operation. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift auto-zero architecture | Eliminates thermal drift-induced errors in long-duration measurements without external calibration. |
| Rail-to-rail output stage | Delivers full dynamic range to downstream ADCs, maximizing effective number of bits (ENOB) in 16-bit systems. |
| Ultra-low input bias current | ±70 pA typical enables use with high-impedance sources (e.g., thermocouples, pH electrodes) without gain error. |
| Single-supply optimization | Operates down to +2.7 V with input common-mode range extending to V– – 0.1 V, simplifying 3.3 V system design. |
| Extended temperature rating | Specified from –40°C to +125°C ambient, validated for automotive under-hood and industrial control cabinet deployment. |
Applications
| Transducer Signal Conditioning | Temperature Measurement |
|---|---|
Use Scenario: Amplifying low-level mV outputs from load cells, strain gauges, or pressure sensors in electronic scales and industrial weighing systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with gain ≥100, rejecting common-mode noise from long sensor cables. Use Value: 5 µV max offset and 0.05 µV/°C drift ensure ≤0.01% FS error drift over full industrial temperature range without recalibration. | Use Scenario: Cold-junction compensation and linearization of K-type thermocouple outputs in medical patient monitors and lab analyzers. IC Role / Device Role / Timing Role: Low-noise, low-drift buffer and reference amplifier driving 24-bit delta-sigma ADCs with 0.1°C resolution. Use Value: 1.4 µVPP 0.01–10 Hz noise and rail-to-rail swing preserve SNR when digitizing microvolt-level thermocouple signals. |
| Medical Instrumentation | Battery-Powered Handheld Test Equipment |
Use Scenario: Front-end amplification of ECG, EEG, or bioimpedance signals where DC accuracy and long-term stability are critical. IC Role / Device Role / Timing Role: High-input-impedance, low-drift DC-coupled amplifier with gain ≥1000 for analog front-end signal chain. Use Value: ±70 pA input bias current prevents electrode polarization errors; 110 dB CMRR suppresses 50/60 Hz mains interference. | Use Scenario: Portable multimeters, oscilloscope probes, and loop calibrators requiring multi-decade dynamic range and field reliability. IC Role / Device Role / Timing Role: Precision reference buffer, autoranging amplifier, and ADC driver in compact, low-power portable instruments. Use Value: 285 µA quiescent current enables >500 hours of continuous operation on two AA alkaline cells at 3.3 V supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDR | Same zero-drift architecture but 17 µV max offset, 0.1 µV/°C max drift, and 17 µA quiescent current - lower power, higher drift. | Targeted at ultra-low-power sensor nodes where sub-µA IQ dominates over drift; unsuitable for <0.1°C temperature accuracy. | Select OPA333AIDR only if system-level drift budget allows >2× higher drift and IQ <200 µA is mandatory. |
| LTC2050CS8#TRPBF | 0.5 µV max offset, 0.015 µV/°C max drift, 650 µA IQ, SO-8 package - tighter drift spec but 2.3× higher supply current. | Preferred in metrology-grade equipment where drift is primary constraint and power is secondary; requires additional decoupling due to higher IQ noise. | Choose LTC2050CS8#TRPBF when drift must be <0.02 µV/°C and system can accommodate 650 µA IQ and tighter layout tolerances. |
Compared with OPA335AIDR, OPA333AIDR trades drift performance for ultra-low power, while LTC2050CS8#TRPBF delivers superior drift at higher current and cost - making OPA335AIDR the balanced choice for industrial instrumentation requiring both low drift and sub-300 µA operation.
Availability
OPA335AIDR is available at Aetrix Electronics and suitable for transducer signal conditioning, temperature measurement, medical instrumentation, and battery-powered handheld test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA335AIDR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPA335AIDR belongs to TI's Zerø-Drift Series of precision op amps, designed specifically for high-accuracy DC-coupled signal chains in harsh thermal environments where traditional op amps exhibit unacceptable drift-induced errors.
FAQ
What is the maximum operating temperature range for the OPA335AIDR?
The OPA335AIDR is specified for operation from –40°C to +125°C ambient temperature, with absolute maximum junction temperature rated at +150°C. This extended range supports deployment in automotive under-hood modules, industrial PLCs, and outdoor environmental monitoring equipment where thermal stress is significant. The device maintains its 5 µV max offset and 0.05 µV/°C max drift specifications across this full range.
Does the OPA335AIDR include a shutdown pin or enable function?
No, the OPA335AIDR does not include a shutdown pin or enable function. It is the non-shutdown variant of the Zerø-Drift Series - distinct from the OPA334 family which integrates an Enable pin. The OPA335AIDR operates continuously when powered; any power-gating must be implemented externally via supply rail control. This simplifies layout but precludes dynamic current reduction during idle periods.
What package type and pin count does the OPA335AIDR use?
The OPA335AIDR uses an 8-pin SOIC (D) package per JEDEC MS-012 standard, with 1.27 mm lead pitch, 3.9 mm × 4.9 mm body size, and no exposed thermal pad. Pins 1, 6, and 7 are no-connect (NC) terminals - internally unconnected and must remain unattached in PCB layout to prevent parasitic coupling or reliability risks.
Can the OPA335AIDR drive capacitive loads, and what is its stability behavior?
Yes, the OPA335AIDR is unity-gain stable and characterized to drive capacitive loads up to 300 pF without oscillation, as confirmed in the Small-Signal Response plot (CL = 50 pF) and Large-Signal Response (CL = 300 pF) in the datasheet. For loads >300 pF, a series isolation resistor (typically 10–100 Ω) between output and capacitance is recommended to maintain phase margin >45° and prevent peaking or ringing.
How does the auto-zeroing architecture of the OPA335AIDR affect its noise performance?
The OPA335AIDR's auto-zeroing architecture produces 1.4 µVPP integrated noise from 0.01 Hz to 10 Hz and negligible fundamental energy at the 10 kHz correction frequency - aliasing is suppressed to >20 MHz where it is easily filtered. Unlike chopper amplifiers, it exhibits no switching artifacts in the audio or sensor bandwidth, making it suitable for DC-coupled precision measurement without post-processing filtering.
OPA335AIDR 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:
- 1.6V/µs
- Gain Bandwidth Product:
- 2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 70 pA
- Voltage - Input Offset:
- 1 µV
- Current - Supply:
- 285µA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.7 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
OPA335AIDR FAQ
1.How can I place an order for OPA335AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA335AIDR 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 OPA335AIDR reliable?
The price and inventory of OPA335AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA335AIDR is usually 5 days.
3.What payment methods are accepted for OPA335AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA335AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA335AIDR?
OPA335AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA335AIDR 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 OPA335AIDR?
For technical support, including OPA335AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA335AIDR requirements.
6.How does Aetrix verify that OPA335AIDR is sourced from the original manufacturer or authorized distributors?
All OPA335AIDR 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 OPA335AIDR meets industry standards.
7.What is the process for return or replacement of OPA335AIDR?
All OPA335AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA335AIDR, 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 OPA335AIDR part is unused and in its original packaging.
Return procedure for OPA335AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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