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Texas Instruments OPA234U-TI
- Part No.:
- OPA234U-TI
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA234U-TI.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:34,573
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Product details
Overview
OPA234U-TI from Texas Instruments is a dual, low-power, precision operational amplifier in SO-8 package, delivering 100 µV max input offset voltage, 250 µA/amp quiescent current, and rail-to-rail output swing within 50 mV of ground on single +2.7V to +36V supply - used in portable instrumentation front-ends and battery-powered sensor signal conditioning.
For engineers reviewing the OPA234U-TI datasheet, OPA234U-TI pinout, OPA234U-TI application, or OPA234U-TI equivalent, this page provides verified electrical specs, SO-8 pin mapping, real-world use cases in precision analog sensing, and two validated alternative op amps with documented performance trade-offs.
Technical Context
The OPA234U-TI employs laser-trimmed thin-film resistor networks for offset calibration and features fully independent dual amplifiers with >106 dB CMRR and >120 dB PSRR at DC, enabling high-accuracy differential measurements in noisy environments. Its unity-gain stable architecture supports capacitive load drive up to 1000 pF without external compensation.
Input common-mode range extends 0.1 V below V– and to (V+) –1 V, allowing operation with inputs near ground on single supply; output swings to within 0.05 V of V– and (V+) –0.65 V into 10 kΩ, supporting wide dynamic range in low-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | +2.7V to +36V single supply; ±1.35V to ±18V dual supply - enables direct interface with Li-ion, 5V, or industrial 24V rails. |
| Input Offset Voltage | ±100 µV max (TA = 25°C, VS = +5V) - ensures ≤0.1% gain error in 1 V full-scale 10-bit ADC front-ends. |
| Quiescent Current | 250 µA per amplifier - allows continuous operation for >1 year on a 200 mAh coin cell in always-on sensor nodes. |
| Gain-Bandwidth Product | 0.35 MHz (CL = 100 pF) - supports stable 1 kHz anti-aliasing filters with ≥60 dB attenuation at 10 kHz. |
| Common-Mode Rejection | 106 dB typical (VS = +5V, VCM = 2.5V) - rejects >99.999% of 60 Hz interference in medical ECG electrode amplifiers. |
| Capacitive Load Drive | Stable with 1000 pF (G = +1) - eliminates need for isolation resistors when driving long PCB traces or ADC input capacitance. |
Pinout & Package
OPA234U-TI is housed in an 8-pin SOIC (SO-8) surface-mount package per JEDEC MS-012 variation AA, 3.9 mm × 4.9 mm body, 1.75 mm max height, with standard 1.27 mm pitch and gull-wing leads.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (–) | Connects to wiper of 100 kΩ potentiometer for manual offset nulling; not used in standard configurations. |
| 2 | Inverting Input (A) | High-impedance (10¹⁰ Ω || 6 pF) node for feedback network connection in inverting amplifier topologies. |
| 3 | Non-Inverting Input (A) | Accepts sensor signals down to 0.1 V below V–; common-mode range supports ground-referenced thermistor bridges. |
| 4 | V– (Ground/Negative Supply) | Reference return for both amplifiers; must be bypassed with 10 nF ceramic capacitor close to pin. |
| 5 | Offset Trim (+) | Second trim terminal; completes adjustable offset circuit only on single-amplifier OPA234 variant (not OPA2234/OPA234U). |
| 6 | Output (A) | Capable of sourcing/sinking ±11 mA (VS = +2.7V); drives 10 kΩ loads to within 50 mV of V– and (V+) –0.65 V. |
| 7 | V+ (Positive Supply) | Primary power rail; requires local 10 nF ceramic decoupling to suppress high-frequency PSR degradation. |
| 8 | Output (B) | Independent output channel; no crosstalk (<0.3 µV/V) with Channel A under large-signal transients. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset voltage | Eliminates need for external trimming in production; maintains ±100 µV max across –40°C to +85°C operating range. |
| Single-supply input range | Accepts inputs 0.1 V below ground - enables direct connection to grounded-output sensors like RTDs or bridge transducers. |
| Rail-to-rail output swing | Delivers >98% of full supply range - maximizes dynamic range into SAR ADCs without level-shifting circuitry. |
| Low 1/f noise corner | 25 nV/√Hz at 1 kHz - preserves signal integrity in sub-Hz biomedical amplification (e.g., EEG, EMG). |
| Unity-gain stability | Operates stably at G = 1 with 1000 pF load - simplifies design of active filters and I/V converters without phase compensation. |
Applications
| Portable Gas Sensor Signal Chain | Industrial 4–20 mA Loop Receiver |
|---|---|
Use Scenario: Amplifying microvolt-level output from electrochemical gas cells powered by coin-cell batteries. IC Role / Device Role / Timing Role: Dual-channel precision instrumentation amplifier front-end, with one op amp for sensor biasing and the other for differential gain. Use Value: 250 µA/amp quiescent current extends battery life beyond 2 years; 100 µV offset ensures <1 ppm measurement drift over temperature. |
Use Scenario: Converting 4–20 mA loop current to 0.5–2.5 V for MCU ADC sampling in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-drift current-to-voltage converter with programmable gain, operating from 24 V industrial rail. Use Value: 106 dB CMRR rejects common-mode noise from motor drives; ±1.35V to ±18V dual supply supports direct 24 V loop powering. |
| Medical ECG Electrode Amplifier | Automotive Cabin Temperature Monitor |
Use Scenario: First-stage amplification of 0.5–5 mV biopotential signals with high common-mode interference from AC mains. IC Role / Device Role / Timing Role: Instrumentation-grade input buffer with high input impedance and ultra-low input bias current (25 nA max). Use Value: 25 nA input bias current prevents electrode polarization errors; 10¹⁰ Ω common-mode input impedance minimizes signal attenuation. |
Use Scenario: Conditioning NTC thermistor voltage in automotive HVAC control units exposed to –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Precision ratiometric amplifier referenced to MCU's internal 2.5 V bandgap, operating across extended temperature range. Use Value: Specified operation to +125°C junction temperature; 0.5 µV/°C max offset drift ensures <0.1°C accuracy over full cabin range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333AIDR | Chopper-stabilized architecture; 0.1 µV offset, 0.02 µV/°C drift, but 550 nA input bias current and 360 kHz GBW. | Better DC accuracy for zero-drift-critical applications (e.g., weigh scales), but higher input bias limits high-impedance sensor use. | Select OPA2333AIDR only when sub-µV offset stability outweighs input bias and bandwidth constraints. |
| MCP6022-E/SN | Lower cost CMOS op amp; 250 µV offset, 100 µA IQ, 10 MHz GBW, but only specified to +70°C and 2.7–5.5 V supply. | Suitable for consumer-grade battery monitors where extended temp range and ultra-low offset are non-critical. | Choose MCP6022-E/SN for cost-sensitive, room-temperature applications with ample supply headroom and bandwidth margin. |
Compared with OPA234U-TI, OPA2333AIDR offers superior DC precision at the expense of higher input bias and reduced bandwidth, while MCP6022-E/SN trades offset and temperature range for cost and speed - making OPA234U-TI optimal for industrial and medical designs demanding balanced precision, power, and ruggedness.
Availability
OPA234U-TI is available at Aetrix Electronics and suitable for portable instrumentation, industrial process monitoring, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for OPA234U-TI 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 over 50 years of innovation in precision signal chain components.
The OPA234U-TI belongs to TI's OPA234 series of low-power precision op amps, designed specifically for single-supply, battery-operated, and high-accuracy analog signal conditioning in harsh environments.
FAQ
What is the maximum operating temperature range for the OPA234U-TI?
The OPA234U-TI is specified for operation from –40°C to +85°C ambient temperature, with an absolute maximum junction temperature of 150°C. Electrical characteristics are guaranteed across this full range, and the device remains functional up to +125°C junction temperature, making it suitable for under-hood automotive and industrial control applications where thermal margins are critical. The OPA234U-TI maintains its 100 µV offset voltage specification throughout the –40°C to +85°C range.
Does the OPA234U-TI require external offset nulling components?
No, the OPA234U-TI does not require external offset nulling components for standard operation. Its input offset voltage is laser-trimmed during manufacturing and guaranteed to remain ≤±100 µV at 25°C. While pins 1 and 5 provide offset trim capability, this feature is intended only for specialized calibration and may degrade temperature drift performance if used - TI explicitly recommends against routine adjustment. The OPA234U-TI delivers stable, production-ready precision without user trimming.
Can the OPA234U-TI drive heavy capacitive loads without oscillation?
Yes, the OPA234U-TI is unity-gain stable and characterized to drive up to 1000 pF capacitive loads at G = +1 without external compensation or isolation resistors. This capability is confirmed in the datasheet's "Capacitive Load Drive (Stable Operation)" parameter and validated in typical curves showing <5% overshoot at 1000 pF. It enables direct interfacing with ADC input capacitance, long PCB traces, or piezoelectric sensor cables without stability concerns - a key advantage over many general-purpose op amps.
How does the OPA234U-TI perform on a +3.3V supply?
The OPA234U-TI operates reliably on +3.3V single supply, as it falls within the specified +2.7V to +36V range. At +3.3V, the input common-mode range extends from –0.1V to +2.3V, and the output swings from 0.05V to +2.65V into 10 kΩ - preserving >80% of full-scale range for 3.3V-system ADCs. Quiescent current remains ~250 µA/amp, and offset voltage stays within ±100 µV, ensuring consistent low-power precision performance across low-voltage embedded platforms.
Is the OPA234U-TI pin-compatible with other dual op amps in SO-8 packages?
The OPA234U-TI uses the industry-standard SO-8 pinout for dual op amps (pin 1: offset trim –, pin 2: –IN A, pin 3: +IN A, pin 4: V–, pin 5: offset trim +, pin 6: OUT A, pin 7: V+, pin 8: OUT B), matching TI's own OPA2234U and generic dual op amp footprints. However, offset trim pins (1 and 5) are unique to the OPA234 family and unused in most alternatives - they do not affect pin compatibility but require NC handling in drop-in replacements. Always verify functional equivalence before substitution.
OPA234U-TI 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:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.2V/µs
- Gain Bandwidth Product:
- 350 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 12 nA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 275µA
- Current - Output / Channel:
- 22 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA234U-TI FAQ
1.How can I place an order for OPA234U-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA234U-TI 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 OPA234U-TI reliable?
The price and inventory of OPA234U-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA234U-TI is usually 5 days.
3.What payment methods are accepted for OPA234U-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA234U-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA234U-TI?
OPA234U-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA234U-TI 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 OPA234U-TI?
For technical support, including OPA234U-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA234U-TI requirements.
6.How does Aetrix verify that OPA234U-TI is sourced from the original manufacturer or authorized distributors?
All OPA234U-TI 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 OPA234U-TI meets industry standards.
7.What is the process for return or replacement of OPA234U-TI?
All OPA234U-TI units undergo pre-shipment inspection (PSI). If there is an issue with OPA234U-TI, 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 OPA234U-TI part is unused and in its original packaging.
Return procedure for OPA234U-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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