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Texas Instruments OPA734AIDR
- Part No.:
- OPA734AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA734AIDR.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,574
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Product details
Overview
OPA734AIDR from Texas Instruments is a zero-drift, single-supply CMOS operational amplifier with 5µV max offset voltage, 0.05µV/°C max drift, 750µA max quiescent current, rail-to-rail output swing within 50mV of rails, and integrated shutdown control. It serves as a precision signal-conditioning front-end in low-voltage, battery-powered instrumentation requiring long-term DC accuracy.
For engineers reviewing the OPA734AIDR datasheet, OPA734AIDR pinout, OPA734AIDR application, or OPA734AIDR equivalent, this page delivers verified specifications, SO-8 package terminal mapping, real-world use cases in transducer interfaces and medical sensing, and validated alternative options for design continuity.
Technical Context
The OPA734AIDR employs auto-zeroing architecture with a time-continuous 1.6MHz main amplifier corrected every 100µs, enabling simultaneous low offset (5µV) and near-zero thermal drift (0.05µV/°C). Its input stage features CMOS topology with ±200pA max bias current and rail-to-rail common-mode range from (V−) − 0.1V to (V+) − 1.5V.
Shutdown functionality is implemented via a CMOS-compatible enable pin referenced to V−, with logic HIGH (> V− + 2V) activating the amplifier and logic LOW (< V− + 0.8V) reducing supply current to 9µA max while placing output in high-impedance state. The device is unity-gain stable and immune to output phase reversal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 5µV (max) - enables sub-10µV system-level DC error in precision bridge or thermocouple amplifiers |
| Drift vs Temperature | 0.05µV/°C (max) - ensures <0.5µV total drift over 10°C ambient change, critical for unattended temperature measurement |
| Quiescent Current | 750µA (max) - supports >1-year battery life in handheld test equipment operating at 3V supply |
| Supply Range | 2.7V to 12V (single or ±1.35V to ±6V) - compatible with Li-ion, 3.3V, and 5V systems without level-shifting |
| Input Bias Current | 200pA (max) - minimizes voltage error across high-impedance sensor sources like piezoresistive bridges |
| Output Swing | Within 50mV of rails - preserves full dynamic range when driving SAR ADCs with 0–VREF input ranges |
| Enable Response | tON = 150µs (includes one auto-zero cycle), tOFF = 1.5µs - allows fast power gating in multiplexed sensor arrays |
Pinout & Package
OPA734AIDR is packaged in an 8-pin SOIC (D package), 3.9mm × 4.9mm body, RoHS-compliant, moisture sensitivity level 2 (260°C peak reflow).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Enable | CMOS-compatible digital input; logic HIGH (> V− + 2V) enables amplifier, logic LOW disables output to high-Z |
| 2 | Inverting Input (−IN) | Differential input node; accepts signals within (V−) − 0.1V to (V+) − 1.5V common-mode range |
| 3 | Non-Inverting Input (+IN) | Differential input node; matched impedance and bias current to −IN for optimal CMRR |
| 4 | V− | Negative supply rail; reference for enable pin and internal circuitry; must be connected even in single-supply operation |
| 5 | Output (OUT) | Rail-to-rail output capable of sourcing/sinking ±20mA; high-impedance when disabled |
| 6 | V+ | Positive supply rail; supports up to +12V or ±6V; requires 0.1µF bypass capacitor placed adjacent to pin |
| 7 | NC | No connection - internally unused; must remain unconnected per datasheet |
| 8 | NC | No connection - internally unused; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Auto-zero architecture | Continuous 1.6MHz signal-path amplifier corrected every 100µs - eliminates 1/f noise and guarantees initial VOS accuracy after power-up |
| Rail-to-rail output | Swings within 50mV of V+ and V− - maximizes usable ADC input range without external level-shifting circuitry |
| Low-input-bias-current CMOS inputs | ±200pA max over temperature - prevents gain error in high-impedance transducer interfaces (e.g., load cells, pH electrodes) |
| Integrated shutdown | Reduces IQ from 750µA to 9µA - enables microamp-level sleep modes in portable instrumentation with fast wake-up (150µs) |
| Unity-gain stability | No external compensation required - simplifies layout and reduces BOM count in gain-of-1 buffer and sensor interface applications |
Applications
| Transducer Signal Conditioning | Medical Instrumentation Front-End |
|---|---|
|
Use Scenario: Amplifying mV-level outputs from strain-gauge load cells or pressure sensors in electronic scales. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with programmable gain and offset nulling. Use Value: 5µV offset and 0.05µV/°C drift ensure ≤0.005% full-scale error over industrial temperature range without recalibration. |
Use Scenario: Biopotential signal acquisition in ECG or EEG patient monitors with isolated analog front-ends. IC Role / Device Role / Timing Role: Low-noise, high-impedance buffer and differential amplifier for electrode interface. Use Value: 200pA input bias current prevents electrode polarization errors; rail-to-rail output drives 16-bit SAR ADC directly. |
| Battery-Powered Test Equipment | Temperature Measurement Systems |
|
Use Scenario: Portable multimeter or handheld oscilloscope input stage operating from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: High-precision, low-power signal conditioner for AC/DC voltage and current measurement paths. Use Value: 750µA quiescent current extends battery life beyond 12 months; shutdown mode cuts standby current to 9µA. |
Use Scenario: Cold-junction compensation and linearization in thermocouple-based temperature controllers. IC Role / Device Role / Timing Role: Precision reference buffer and thermistor interface amplifier in analog domain. Use Value: Near-zero drift eliminates thermal EMF-induced drift in multi-sensor systems; 2.7V min supply supports energy-harvesting nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA735AIDR | No shutdown pin; SOT23-5 and SO-8 variants available; identical offset (5µV), drift (0.05µV/°C), and supply range | Lacks enable control; suited for always-on, space-constrained designs where shutdown is unnecessary | Select OPA735AIDR when board area is limited and continuous operation is acceptable |
| AD8628ARZ | Zero-drift amplifier with 1µV max offset, 0.002µV/°C drift, 1.2mA IQ, SO-8 package; no shutdown function | Lower drift but higher quiescent current; optimized for ultra-stable lab-grade instruments rather than portable devices | Select AD8628ARZ when ultimate DC stability outweighs battery-life requirements |
Compared with OPA734AIDR, OPA735AIDR removes shutdown capability to reduce cost and footprint, while AD8628ARZ trades higher supply current for significantly lower drift-making OPA734AIDR the optimal balance of precision, power efficiency, and controllability in portable instrumentation.
Availability
OPA734AIDR is available at Aetrix Electronics and suitable for transducer signal conditioning, medical instrumentation front-ends, and battery-powered test equipment requiring stable component supply across extended production lifecycles.
Supply support for OPA734AIDR 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 OPA734AIDR belongs to TI's Zerø-Drift Series of CMOS op amps, engineered specifically for high-accuracy, low-power, single-supply applications in instrumentation, industrial sensing, and portable medical devices.
FAQ
What is the maximum allowable supply voltage for OPA734AIDR?
The absolute maximum supply voltage for OPA734AIDR is +13.2V. Operation above this rating risks permanent damage. The recommended operating range is +2.7V to +12V for single-supply configurations or ±1.35V to ±6V for dual supplies. Exceeding +12V during normal operation degrades long-term reliability, even if below the absolute maximum limit. Always include transient protection if the system may experience voltage spikes.
Does OPA734AIDR require external compensation for unity-gain stability?
No, OPA734AIDR is internally compensated for unity-gain stability. It does not require external capacitors or resistors to maintain phase margin in gain-of-1 configurations. This simplifies PCB layout and eliminates tuning steps in precision buffer or follower applications. The device maintains >60° phase margin across its full operating temperature range and supply voltage span.
How does the enable pin on OPA734AIDR behave when left floating?
When the enable pin of OPA734AIDR is left unconnected, internal pull-up circuitry activates the amplifier by default. The device operates normally with full performance (750µA IQ, 5µV offset). To disable the amplifier, the enable pin must be actively driven to a logic LOW (< V− + 0.8V); floating is functionally equivalent to logic HIGH. This behavior ensures fail-safe operation in case of control-line open-circuit faults.
Can OPA734AIDR drive capacitive loads without oscillation?
OPA734AIDR can safely drive ≥1000pF capacitive loads with minimal overshoot (<5%), as confirmed in typical characteristics. For loads >1000pF, a small series resistor (10–50Ω) between output and capacitance restores stability. The device's robust phase margin and auto-zero architecture prevent sustained ringing or latch-up, making it suitable for driving ADC input capacitors and long cables in data acquisition systems.
What is the output impedance of OPA734AIDR in shutdown mode?
In shutdown mode, OPA734AIDR places its output in a true high-impedance state with leakage current <10nA - effectively disconnecting the amplifier from downstream circuitry. This allows safe multiplexing of multiple OPA734AIDR outputs onto a shared analog bus without interaction or loading effects. The high-Z state is maintained regardless of input signal levels or supply voltage, ensuring signal integrity in gated amplifier architectures.
OPA734AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.5V/µs
- Gain Bandwidth Product:
- 1.6 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 pA
- Voltage - Input Offset:
- 1 µV
- Current - Supply:
- 600µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA734AIDR FAQ
1.How can I place an order for OPA734AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA734AIDR 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 OPA734AIDR reliable?
The price and inventory of OPA734AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA734AIDR is usually 5 days.
3.What payment methods are accepted for OPA734AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA734AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA734AIDR?
OPA734AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA734AIDR 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 OPA734AIDR?
For technical support, including OPA734AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA734AIDR requirements.
6.How does Aetrix verify that OPA734AIDR is sourced from the original manufacturer or authorized distributors?
All OPA734AIDR 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 OPA734AIDR meets industry standards.
7.What is the process for return or replacement of OPA734AIDR?
All OPA734AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA734AIDR, 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 OPA734AIDR part is unused and in its original packaging.
Return procedure for OPA734AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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