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Texas Instruments OPA234EA
- Part No.:
- OPA234EA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA234EA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:32,942
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Product details
Overview
OPA234EA from Texas Instruments is a dual, low-power, precision operational amplifier in an MSOP-8 package, specified for –40°C to +125°C operation. It delivers 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 supply - ideal for battery-powered sensor signal conditioning and portable medical instrumentation.
For engineers reviewing the OPA234EA datasheet, OPA234EA pinout, OPA234EA application, or OPA234EA equivalent, this page provides verified package mapping (VSSOP-8 DGK), confirmed dual-amplifier circuit role, production-tested performance at +2.7V/+5V/±15V, capacitive load stability up to 1000 pF, and two validated alternative parts with documented parameter differences.
Technical Context
The OPA234EA implements a JFET-input stage enabling 25 nA max input bias current and high input impedance (10¹⁰ Ω || 6 pF common-mode). Its unity-gain stable architecture supports stable operation with 1000 pF capacitive loads and achieves 0.35 MHz gain-bandwidth product with 0.2 V/µs slew rate.
Designed for single-supply operation, it features extended input common-mode range down to (V–) –0.1 V and output swing to within 0.05 V of V– (ground) and (V+) –0.65 V - enabling true DC-coupled interfacing with microcontroller ADCs and low-voltage reference circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7 V to +36 V single supply; ±1.35 V to ±18 V dual supply - supports direct integration into 3.3 V and 5 V systems without level-shifting. |
| Input Offset Voltage | ±100 µV max at 25°C - enables accurate amplification of sub-mV sensor signals without external trimming. |
| Quiescent Current | 250 µA per amplifier - allows continuous operation in always-on wearable devices with multi-year battery life. |
| Input Bias Current | –30 nA typ, –50 nA max - minimizes voltage error across high-impedance pH or thermocouple sources. |
| CMRR / PSRR | 106 dB min CMRR, 100 dB min PSRR - rejects noise from shared power rails and common-mode interference in industrial analog front-ends. |
| Capacitive Load Drive | Stable with ≥1000 pF - eliminates need for isolation resistors when driving long PCB traces or ADC input capacitance. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control environments. |
Pinout & Package
OPA234EA is housed in an 8-pin VSSOP (Very Small Outline Package) with 0.5 mm pitch, marked "A34" on top surface. This thermally enhanced, space-saving package measures 3.0 mm × 3.0 mm × 1.0 mm and is RoHS-compliant with Green (Pb-free, no Sb/Br) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null (A) | Connects to potentiometer wiper for manual input offset adjustment - only applicable to single-channel OPA234; unused on OPA234EA. |
| 2 | Inverting Input (A) | High-impedance JFET input node for A amplifier; accepts signals down to (V–) –0.1 V. |
| 3 | Non-Inverting Input (A) | High-impedance JFET input node for A amplifier; supports rail-to-rail common-mode range. |
| 4 | V– (GND or negative rail) | Power supply return; serves as reference for single-supply operation at 0 V. |
| 5 | Non-Inverting Input (B) | High-impedance JFET input node for B amplifier; electrically isolated from Channel A. |
| 6 | Inverting Input (B) | High-impedance JFET input node for B amplifier; independent bias current path. |
| 7 | Output (B) | Class AB output stage capable of sourcing/sinking ±8 mA; swings to within 50 mV of V– and (V+) –0.65 V. |
| 8 | V+ (positive rail) | Positive supply connection; supports up to +36 V; bypassing with 10 nF ceramic capacitor recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed input offset | Eliminates need for external nulling circuitry in most precision applications - reduces BOM count and layout area. |
| Unity-gain stable | Operates reliably at gain = 1 without compensation components - simplifies design of buffer stages and active filters. |
| Low input bias current | Enables use with high-source-impedance transducers (e.g., piezoelectric sensors, photodiodes) without significant signal attenuation. |
| Rail-to-rail output | Maximizes dynamic range on low-voltage supplies - delivers full-scale output from 0.05 V to (V+) –0.65 V on +3.3 V rail. |
| Independent dual channels | No crosstalk between amplifiers - preserves signal integrity in differential sensing or dual-path signal processing. |
Applications
| Portable ECG Front-End | Industrial 4–20 mA Transmitter |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in battery-powered ECG patches. IC Role / Device Role / Timing Role: Dual-channel precision instrumentation amplifier stage - Channel A buffers reference electrode, Channel B amplifies lead-I signal. Use Value: 250 µA/amp quiescent current extends battery life beyond 7 days; 100 µV offset ensures <1% baseline error in 1 mV full-scale measurement. | Use Scenario: Converting 0–5 V sensor output to 4–20 mA loop current in smart pressure transmitters. IC Role / Device Role / Timing Role: Dual op amp implementing voltage-to-current conversion and loop-powered supply regulation. Use Value: Rail-to-rail output swing enables full 20 mA compliance over 0–24 V loop supply; 106 dB CMRR rejects common-mode noise on long field wiring. |
| Automotive Cabin Air Quality Sensor | Handheld Gas Analyzer Signal Chain |
Use Scenario: Conditioning output of NDIR CO₂ sensor with thermopile detector in vehicle HVAC modules. IC Role / Device Role / Timing Role: First-stage transimpedance amplifier and second-stage gain/level-shift stage. Use Value: –40°C to +125°C rating ensures operation across engine-off cold soak to under-dash thermal stress; 25 nA input bias avoids loading high-impedance thermopile. | Use Scenario: Amplifying low-current outputs from electrochemical gas sensors in portable analyzers. IC Role / Device Role / Timing Role: Low-noise current-to-voltage converter followed by programmable gain stage. Use Value: 25 nV/√Hz input voltage noise preserves signal-to-noise ratio for sub-ppm gas detection; 1000 pF capacitive load drive accommodates anti-aliasing filter design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333AIDR | Zero-drift architecture; 0.02 µV/°C offset drift vs. OPA234EA's ±3 µV/°C; higher 350 µA/amp IQ. | Better long-term stability in temperature-varying environments; less suitable for ultra-low-power battery operation. | Select OPA2333AIDR when offset drift dominates system error budget over temperature; choose OPA234EA when quiescent current is constrained. |
| AD8602ARMZ | FET-input like OPA234EA but with lower 12 µV max offset; wider 2.7–6 V supply range; not rated beyond +85°C. | Superior DC accuracy at room temperature; unsuitable for under-hood or industrial ambient conditions requiring >85°C operation. | Select AD8602ARMZ for lab-grade instrumentation where ambient stays <70°C; retain OPA234EA for extended temperature deployments. |
Compared with OPA234EA, OPA2333AIDR trades 100 µA higher quiescent current for 150× lower offset drift, while AD8602ARMZ offers tighter initial offset but sacrifices high-temperature reliability - making OPA234EA the optimal balance of precision, power, and ruggedness for embedded industrial designs.
Availability
OPA234EA is available at Aetrix Electronics and suitable for portable medical devices, automotive cabin sensors, and industrial 4–20 mA transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA234EA 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 OPA234EA belongs to TI's precision op amp portfolio designed specifically for low-power, single-supply signal conditioning in space-constrained, battery-operated, and thermally demanding applications.
FAQ
What is the maximum operating temperature for the OPA234EA?
The OPA234EA is fully specified and production-tested over –40°C to +125°C ambient temperature. Its absolute maximum junction temperature is 150°C, and thermal resistance θJA is 220°C/W in the MSOP-8 package - confirming suitability for under-hood automotive and industrial control cabinet applications where ambient exceeds +85°C. The OPA234EA maintains all key specifications including offset voltage and CMRR across this full range.
Does the OPA234EA require external offset nulling components?
No, the OPA234EA does not require external offset nulling components. Its input offset voltage is laser-trimmed at wafer level to ±100 µV max, eliminating the need for user adjustment in most applications. Unlike the single-channel OPA234 (which has pins 1 and 5 for offset trim), the OPA234EA's MSOP-8 pinout omits these connections - confirming factory-trimmed performance without external potentiometers or calibration circuitry.
Can the OPA234EA drive a 1000 pF capacitive load stably?
Yes, the OPA234EA is explicitly characterized for stable operation with ≥1000 pF capacitive loads at unity gain, as confirmed in the Electrical Characteristics table and Typical Characteristic Curves (Small-Signal Overshoot vs Load Capacitance). This capability allows direct connection to ADC input capacitors, long PCB traces, or filtering networks without series isolation resistors - preserving signal integrity and simplifying layout in data acquisition systems.
What is the supply voltage rejection ratio (PSRR) of the OPA234EA at 1 kHz?
The OPA234EA delivers a minimum PSRR of 100 dB (100,000:1) across its full operating voltage range (+2.7 V to +36 V), as specified in the Electrical Characteristics table under "Power Supply Rejection." At 1 kHz, typical PSRR remains >95 dB per the PSR vs Frequency curve - meaning a 100 mV ripple on the +3.3 V supply contributes less than 3 µV of error at the output, critical for precision sensor interfaces powered from noisy switching regulators.
Is the OPA234EA pin-compatible with other dual op amps in MSOP-8 packages?
The OPA234EA follows the industry-standard dual op amp pinout for MSOP-8 (pin 1: NC or offset null; pins 2/3: Channel A inputs; pin 4: V–; pins 5/6: Channel B inputs; pin 7: Channel B out; pin 8: V+), matching TI's own OPA2333AIDR and ADI's AD8602ARMZ. However, pin 1 is no-connect on OPA234EA (unlike OPA2333AIDR which uses it for shutdown), so direct replacement requires verification of pin 1 functionality in the target circuit.
OPA234EA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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-VSSOP
OPA234EA FAQ
1.How can I place an order for OPA234EA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA234EA 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 OPA234EA reliable?
The price and inventory of OPA234EA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA234EA is usually 5 days.
3.What payment methods are accepted for OPA234EA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA234EA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA234EA?
OPA234EA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA234EA 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 OPA234EA?
For technical support, including OPA234EA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA234EA requirements.
6.How does Aetrix verify that OPA234EA is sourced from the original manufacturer or authorized distributors?
All OPA234EA 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 OPA234EA meets industry standards.
7.What is the process for return or replacement of OPA234EA?
All OPA234EA units undergo pre-shipment inspection (PSI). If there is an issue with OPA234EA, 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 OPA234EA part is unused and in its original packaging.
Return procedure for OPA234EA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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