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Texas Instruments OPA237NA/3KG4
- Part No.:
- OPA237NA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA237NA/3KG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,685
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Product details
Overview
OPA237NA/3KG4 from Texas Instruments is a single-channel, rail-to-rail input/output operational amplifier optimized for single-supply battery-powered systems. It delivers 1.5MHz gain-bandwidth, ±750µV max input offset voltage at 5V supply, 350µA max quiescent current, and output swing within 10mV of ground - enabling precision signal conditioning in portable medical instruments and PCMCIA cards.
For engineers reviewing the OPA237NA/3KG4 datasheet, OPA237NA/3KG4 pinout, OPA237NA/3KG4 application, or OPA237NA/3KG4 equivalent, key selection criteria include its 2.7V–36V wide supply range, low 28nV/√Hz input voltage noise density at 1kHz, –40°C to +85°C operating temperature, and compatibility with SOT-23-5 and SOIC-8 packages for space-constrained designs.
Technical Context
The OPA237NA/3KG4 implements a bipolar-input op amp architecture with rail-to-rail input common-mode range extending below ground and output swing to within 10mV of V–. Its unity-gain stability supports direct use in buffer, sensor interface, and active filter configurations without external compensation.
It features low input bias current (–40nA max), high open-loop gain (75dB min), and robust capacitive load drive capability-stable up to 10,000pF when sourcing current-making it suitable for driving ADC inputs and long traces in portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.7V to 36V single supply; enables direct integration into 3.3V, 5V, and 24V battery or industrial rails without regulation. |
| Gain-Bandwidth Product | 1.5MHz at VS = 30V; supports stable amplification of signals up to ~150kHz at gain = 10. |
| Input Offset Voltage | ±750µV max at VS = 5V; ensures <0.075% error in 1V full-scale precision sensing applications. |
| Quiescent Current | 350µA max per amplifier; allows >10-year battery life in always-on 10µA-systems with duty-cycled operation. |
| Output Swing | Within 10mV of V– and (V+) – 0.75V at RL = 10kΩ; enables true single-supply operation with ground-referenced outputs. |
| Input Voltage Noise | 28nV/√Hz at 1kHz; preserves SNR in low-level transducer signal chains (e.g., thermocouples, strain gauges). |
| Common-Mode Rejection | 85dB min at VS = 5V; rejects power rail ripple and EMI coupling in noisy embedded environments. |
Pinout & Package
OPA237NA/3KG4 is packaged in an 8-pin SOIC (D package), pin-compatible with industry-standard operational amplifier footprints. Thermal resistance RθJA is 180.4°C/W, supporting operation up to +85°C ambient with standard PCB copper pour.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No connect - must be left floating; not internally bonded. |
| 2 | –IN | Inverting input - accepts feedback network for closed-loop gain configuration. |
| 3 | +IN | Noninverting input - connects to sensor or reference signal source. |
| 4 | V– | Negative supply rail - tied to ground in single-supply systems; sets lower output limit. |
| 5 | NC | No connect - must be left floating; not internally bonded. |
| 6 | OUT | Amplified output - drives loads ≥10kΩ directly; stable with ≥10,000pF capacitive loads when sourcing. |
| 7 | V+ | Positive supply rail - accepts 2.7V–36V; bypass with 10nF ceramic capacitor per TI recommendation. |
| 8 | NC | No connect - must be left floating; not internally bonded. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Input common-mode extends 0.2V below V– and 1.5V below V+; output swings to within 10mV of V– and 0.75V below V+, enabling full dynamic range utilization on single supplies. |
| Low quiescent current | 350µA max per amplifier - reduces system power budget by >50% vs comparable precision op amps, critical for coin-cell or Li-ion portable devices. |
| Wide supply voltage range | Operates from 2.7V to 36V single supply or ±1.35V to ±18V dual supply - eliminates need for separate LDOs in multi-rail systems like handheld test equipment. |
| Unity-gain stable | Requires no external compensation - simplifies layout and reduces BOM count in buffer, I/V conversion, and active filtering applications. |
| High PSRR and CMRR | 30µV/V PSRR and 85dB CMRR minimize error from supply ripple and common-mode interference in battery-monitoring and medical front-ends. |
Applications
| Battery-Operated Instrumentation | Portable Medical Sensors |
|---|---|
|
Use Scenario: Precision analog front-end in handheld blood glucose meters and pulse oximeters powered by single AA/AAA cells. IC Role / Device Role / Timing Role: Single-supply op amp configured as transimpedance amplifier for photodiode current-to-voltage conversion and DC-coupled buffer for ADC input. Use Value: 350µA quiescent current extends battery life beyond 2 years; rail-to-rail output ensures full 0–3.3V ADC range utilization without level-shifting. |
Use Scenario: Low-noise signal conditioning in wearable ECG/EEG patches with coin-cell power sources. IC Role / Device Role / Timing Role: Instrumentation amplifier input stage and anti-aliasing filter driver, operating from 3.0V supply. Use Value: 28nV/√Hz input voltage noise preserves microvolt-level biopotential signals; ±750µV offset minimizes calibration drift over temperature. |
| PCMCIA Card Signal Conditioning | Industrial Sensor Interface |
|
Use Scenario: Analog signal processing in legacy PCMCIA data acquisition cards requiring compact, low-power op amps. IC Role / Device Role / Timing Role: Gain-setting amplifier and level shifter for sensor outputs before multiplexing and digitization. Use Value: SOIC-8 footprint matches standard card layouts; 1.5MHz bandwidth supports sampling rates up to 150ksps with minimal phase error. |
Use Scenario: 4–20mA loop transmitter front-end in factory automation modules operating from 24V rails. IC Role / Device Role / Timing Role: Voltage-to-current converter and isolation-stage buffer, powered directly from loop supply. Use Value: 36V absolute max supply rating tolerates transient surges; 85dB CMRR rejects common-mode noise from motor drives and solenoids. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Zero-drift architecture; 0.1µV/°C offset drift vs. OPA237NA/3KG4's ±7.5µV/°C; 17µA quiescent current vs. 350µA. | Better for µV-level DC stability over temperature; unsuitable where higher drive strength or wider supply range is required. | Select OPA333AIDBVR only if sub-µV offset drift dominates design requirements and supply voltage ≤5.5V. |
| LMV321IDBVR | Rail-to-rail input/output; 1MHz GBW vs. 1.5MHz; 80µA IQ vs. 350µA; ±900µV VOS max vs. ±750µV. | Lower power but reduced bandwidth and accuracy; optimized for cost-sensitive consumer electronics, not precision instrumentation. | Choose LMV321IDBVR only for non-critical signal paths where 1MHz bandwidth and ±900µV offset are acceptable. |
Compared with OPA333AIDBVR and LMV321IDBVR, the OPA237NA/3KG4 uniquely balances 1.5MHz bandwidth, ±750µV offset, 350µA IQ, and 36V supply tolerance - making it the only option among the three viable for 24V industrial sensors and battery-powered medical devices requiring both precision and drive capability.
Availability
OPA237NA/3KG4 is available at Aetrix Electronics and suitable for battery-powered instruments, portable medical devices, and industrial sensor interfaces requiring stable component supply across extended product lifecycles.
Supply support for OPA237NA/3KG4 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 delivering analog and embedded processing solutions, with over 50 years of op amp innovation and manufacturing excellence.
The OPA237NA/3KG4 belongs to TI's MicroAmplifier series - designed specifically for space-constrained, single-supply, battery-operated applications such as PCMCIA cards and portable instrumentation where size, power, and precision are co-optimized.
FAQ
What is the maximum supply voltage for OPA237NA/3KG4?
The OPA237NA/3KG4 has an absolute maximum supply voltage (VS = V+ – V–) of 36V. Operation beyond this rating risks permanent damage. For reliable long-term performance, TI specifies recommended operation from 2.7V to 36V - meaning the OPA237NA/3KG4 can safely run on 24V industrial rails or 3.3V/5V portable systems without derating.
Does OPA237NA/3KG4 support rail-to-rail output swing?
Yes, the OPA237NA/3KG4 provides rail-to-rail output swing: it drives within 10mV of V– and to within 0.75V of V+ under 10kΩ load conditions. This behavior is confirmed across its full –40°C to +85°C operating range and enables true single-supply operation in ground-referenced circuits - a key advantage of the OPA237NA/3KG4 over older general-purpose op amps.
What package types are available for OPA237NA/3KG4?
The OPA237NA/3KG4 is offered exclusively in the 8-pin SOIC (D) package, as indicated by the "/3KG4" suffix and TI's orderable information. While the broader OPA237 family includes SOT-23-5 (DBV), the OPA237NA/3KG4 variant maps to the SOIC-8 footprint - ensuring compatibility with standard op amp layouts and automated assembly processes.
Is OPA237NA/3KG4 unity-gain stable?
Yes, the OPA237NA/3KG4 is explicitly unity-gain stable per TI's datasheet Section 6.1.1. No external compensation is required for gains ≥1, simplifying circuit design in buffer, voltage follower, and active filter applications. This stability holds across its full supply range (2.7V–36V) and temperature range (–40°C to +85°C), confirming the OPA237NA/3KG4's suitability for production-critical analog signal paths.
What is the input offset voltage specification for OPA237NA/3KG4?
The OPA237NA/3KG4 has a maximum input offset voltage of ±750µV at VS = 5V and TA = 25°C, with ±950µV max at VS = 30V. This parameter is production-tested and guaranteed - not typical-only - making the OPA237NA/3KG4 appropriate for precision DC-coupled applications where offset-induced errors must remain below 0.1% of full-scale.
OPA237NA/3KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 1.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 8.5 nA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 200µA
- Current - Output / Channel:
- 8 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA237NA/3KG4 FAQ
1.How can I place an order for OPA237NA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA237NA/3KG4 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 OPA237NA/3KG4 reliable?
The price and inventory of OPA237NA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA237NA/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA237NA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA237NA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA237NA/3KG4?
OPA237NA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA237NA/3KG4 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 OPA237NA/3KG4?
For technical support, including OPA237NA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA237NA/3KG4 requirements.
6.How does Aetrix verify that OPA237NA/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA237NA/3KG4 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 OPA237NA/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA237NA/3KG4?
All OPA237NA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA237NA/3KG4, 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 OPA237NA/3KG4 part is unused and in its original packaging.
Return procedure for OPA237NA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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