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Texas Instruments OPA335AID
- Part No.:
- OPA335AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA335AID.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:171
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Product details
Overview
OPA335AID from Texas Instruments is a single, zero-drift CMOS operational amplifier in SO-8 package, delivering 5µV max input offset voltage, 0.05µV/°C max drift, 285µA quiescent current, rail-to-rail output swing, and unity-gain stability - optimized for precision transducer signal conditioning in battery-powered medical instrumentation and handheld test equipment.
For engineers reviewing the OPA335AID datasheet, OPA335AID pinout, OPA335AID application, or OPA335AID equivalent, key selection criteria include guaranteed low-drift performance over –40°C to +125°C, single-supply operation down to +2.7V, high CMRR (110 dB min), and compatibility with low-noise, high-impedance sensor interfaces requiring sub-microvolt-level accuracy.
Technical Context
The OPA335AID uses auto-zeroing architecture with a time-continuous 2MHz main amplifier corrected every 100µs, enabling near-zero long-term drift and eliminating 1/f noise without introducing significant 10kHz correction artifacts. Its input stage features CMOS topology with ±70pA typical input bias current and 5pF common-mode input capacitance.
It supports rail-to-rail output swing (15mV from rail at 10kΩ load) and operates across +2.7V to +5.5V supply range. The device is unity-gain stable and immune to output phase reversal, with internal protection limiting input current to ±10mA and supporting safe operation up to +7V absolute maximum supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 5µV max - ensures <1 LSB error in 16-bit systems with 100mV full-scale input. |
| Offset Drift | 0.05µV/°C max - enables stable µV-level measurements over industrial temperature range without recalibration. |
| Quiescent Current | 285µA - allows continuous operation for >1 year on a single CR2032 coin cell in portable instrumentation. |
| Gain-Bandwidth Product | 2MHz - supports closed-loop bandwidths up to ~1.5MHz at G=1, suitable for fast sensor response and anti-alias filtering. |
| CMRR | 110dB min - rejects >100,000:1 common-mode interference in bridge sensor applications. |
| Supply Range | +2.7V to +5.5V - compatible with Li-ion, 3.3V logic, and dual ±1.35V supplies without external regulators. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial control environments. |
Pinout & Package
OPA335AID is housed in an 8-pin SOIC (D) package with standard JEDEC MS-012 footprint (4.9mm × 3.9mm × 1.75mm height). Pin 1 is marked by a beveled corner or dot; leads are gull-wing, RoHS-compliant NiPdAu finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pad - must remain unconnected or grounded per layout best practice; no functional impact. |
| 2 (V+) | Positive supply rail | Accepts +2.7V to +5.5V; requires local 0.1µF ceramic decoupling capacitor placed within 2mm. |
| 3 (Out) | Amplifier output | Rail-to-rail capable; drives ≥10kΩ load to within 15mV of rails; stable with ≥100pF capacitive loads. |
| 4 (NC) | No internal connection | Unused pad - electrically isolated; avoid routing signals or power near this pin. |
| 5 (NC) | No internal connection | Unused pad - no internal bond wire; PCB copper should not connect to adjacent pins. |
| 6 (–In) | Inverting input | High-impedance CMOS node (5pF common-mode CIN); sensitive to EMI - guard ring recommended. |
| 7 (+In) | Non-inverting input | Matches –In in bias current (±70pA typ) and capacitance; critical for thermocouple/bridge applications. |
| 8 (V–) | Negative supply rail | Ground reference for single-supply use; supports true 0V output swing when combined with pull-down resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-zero architecture | Continuous 2MHz signal path with 100µs correction cycle - eliminates 1/f noise while preserving bandwidth and stability. |
| Rail-to-rail output | Swings to within 15mV of V– and V+ at 10kΩ load - enables full utilization of ADC input range in single-supply systems. |
| Low input bias current | ±70pA typical - minimizes voltage error across high-impedance sources like thermistors and pH electrodes. |
| High open-loop gain | 110dB minimum - ensures <0.001% gain error in precision gain stages with feedback resistors ≤1MΩ. |
| Unity-gain stability | No external compensation required - simplifies design of buffer, filter, and sensor interface circuits. |
Applications
| Transducer Signal Conditioning | Temperature Measurement |
|---|---|
Use Scenario: Amplifying low-level mV outputs from load cells, strain gauges, and 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: 5µV offset and 0.05µV/°C drift prevent calibration drift over daily thermal cycles, maintaining ±0.01% full-scale accuracy. | Use Scenario: Cold-junction compensation and linearization of K-type thermocouples in medical patient monitors and environmental data loggers. IC Role / Device Role / Timing Role: Low-drift, low-noise buffer and reference amplifier driving 16-bit delta-sigma ADCs with 0.1°C resolution. Use Value: Sub-µV drift ensures <0.05°C measurement error over –10°C to +50°C ambient range without software correction. |
| Battery-Powered Instrumentation | Handheld Test Equipment |
Use Scenario: Front-end amplification in portable multimeters, insulation testers, and portable oscilloscope probes operating from AA/AAA cells. IC Role / Device Role / Timing Role: Low-quiescent-current (285µA) signal conditioner enabling >500-hour runtime between battery changes. Use Value: 285µA IQ and rail-to-rail output maximize dynamic range and battery life without sacrificing DC accuracy. | Use Scenario: Input buffer and active filter in handheld LCR meters, function generators, and portable spectrum analyzers. IC Role / Device Role / Timing Role: Unity-gain stable, low-noise amplifier isolating sensitive analog inputs from digital switching noise. Use Value: 110dB CMRR and 2MHz GBW suppress digital crosstalk and support accurate AC parameter measurement up to 100kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA335AIDBVR | SOT-23-5 package (5-pin), same electrical specs, lower thermal resistance (θJA = 200°C/W vs 150°C/W), no NC pins. | Better suited for space-constrained PCBs; lacks two NC pins but retains identical performance and pin compatibility for core functions. | Select for compact layouts where SO-8 footprint is prohibitive; verify thermal margin in high-power-density designs. |
| AD8628ARZ | Analog Devices zero-drift op amp: 1µV max offset, 0.002µV/°C drift, 1.2mA IQ, SO-8 package, higher supply current and cost. | Superior drift spec but 4× higher quiescent current - unsuitable for battery-critical applications despite tighter offset. | Choose only when ultra-low drift (<0.01µV/°C) dominates over power budget; otherwise OPA335AID offers optimal balance. |
Compared with OPA335AIDBVR, the OPA335AID provides better thermal dissipation in SO-8 and simplified layout due to standardized footprint; compared with AD8628ARZ, it delivers 90% lower quiescent current while meeting most industrial-grade precision requirements at lower cost.
Availability
OPA335AID is available at Aetrix Electronics and suitable for transducer signal conditioning, temperature measurement, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA335AID 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 OPA335AID belongs to TI's Zerø-Drift Series of CMOS op amps, designed specifically for high-accuracy, low-power sensor interface applications where offset voltage and thermal drift directly impact measurement integrity.
FAQ
What is the maximum supply voltage rating for the OPA335AID?
The OPA335AID has an absolute maximum supply voltage of +7V across V+ to V–. Operation beyond this rating risks permanent damage. For reliable long-term performance, the recommended operating range is +2.7V to +5.5V, as specified in the Electrical Characteristics table. Exceeding +5.5V may degrade offset stability and increase quiescent current unpredictably.
Does the OPA335AID support rail-to-rail input operation?
No, the OPA335AID does not support rail-to-rail input. Its input common-mode voltage range is specified from (V–) – 0.1V to (V+) – 1.5V. At +5V supply, this limits usable input range to –0.1V to +3.5V. For true rail-to-rail input capability, consider TI's OPA377 or OPA320 families - the OPA335AID prioritizes ultra-low drift over input range.
Can the OPA335AID drive capacitive loads without oscillation?
Yes, the OPA335AID is unity-gain stable and can safely drive ≥100pF capacitive loads without external compensation, as confirmed in the Typical Characteristics section. For loads >500pF, TI recommends adding a small series resistor (10–50Ω) between the output and capacitor to maintain phase margin. This behavior stems from its auto-zero architecture's inherent stability.
Is the OPA335AID pin-compatible with the OPA334AID?
No, the OPA335AID is not pin-compatible with the OPA334AID. The OPA334AID is a 6-pin SOT-23 device with an Enable pin, while the OPA335AID is an 8-pin SOIC with three NC pins and no shutdown functionality. Their pinouts, package types, and feature sets differ fundamentally - direct replacement requires PCB redesign.
What is the typical input bias current of the OPA335AID at room temperature?
The typical input bias current of the OPA335AID at +25°C is ±70pA, with a maximum of ±200pA over temperature (–40°C to +125°C). This ultra-low value results from its CMOS input stage and makes it suitable for interfacing with high-impedance sensors such as photodiodes, thermistors, and piezoelectric elements without significant loading error.
OPA335AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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
OPA335AID FAQ
1.How can I place an order for OPA335AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA335AID 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 OPA335AID reliable?
The price and inventory of OPA335AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA335AID is usually 5 days.
3.What payment methods are accepted for OPA335AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA335AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA335AID?
OPA335AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA335AID 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 OPA335AID?
For technical support, including OPA335AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA335AID requirements.
6.How does Aetrix verify that OPA335AID is sourced from the original manufacturer or authorized distributors?
All OPA335AID 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 OPA335AID meets industry standards.
7.What is the process for return or replacement of OPA335AID?
All OPA335AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA335AID, 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 OPA335AID part is unused and in its original packaging.
Return procedure for OPA335AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA335AID Tags
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