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Texas Instruments OPA2237EA/2K5
- Part No.:
- OPA2237EA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA2237EA/2K5.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,048
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Product details
Overview
OPA2237EA/2K5 from Texas Instruments is a dual-channel, single-supply operational amplifier in the MicroAmplifier Series, housed in an 8-pin VSSOP (DGK) package. It delivers 750 µV max input offset voltage at 5 V supply, 1.5 MHz gain bandwidth, and 350 µA max quiescent current per amplifier, enabling precision signal conditioning in space-constrained, battery-powered medical instruments and portable test equipment.
For engineers reviewing the OPA2237EA/2K5 datasheet, OPA2237EA/2K5 pinout, OPA2237EA/2K5 application, or OPA2237EA/2K5 equivalent, key selection criteria include rail-to-rail output swing within 10 mV of ground on single supply, channel separation of 1 µV/V, and stable operation with up to 10,000 pF capacitive loads when sourcing current - critical for low-noise sensor front-ends and portable data acquisition systems.
Technical Context
The OPA2237EA/2K5 implements fully independent dual-amplifier circuitry to minimize crosstalk, with each channel supporting identical specifications across supply voltages from 2.7 V to 36 V (single) or ±1.35 V to ±18 V (dual). Its input common-mode range extends 0.2 V below V– and 1.5 V below V+, while output swings to within 10 mV of ground and up to 0.9 V below V+ under 10 kΩ load.
It is unity-gain stable and optimized for low-power, high-precision DC-coupled applications: input bias current remains below –40 nA, input voltage noise density is 28 nV/√Hz at 1 kHz, and open-loop gain exceeds 75 dB across temperature (–40°C to +85°C), ensuring consistent closed-loop accuracy in varying environmental conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.7 V to 36 V single supply; enables direct integration into 3.3 V, 5 V, and 24 V industrial and portable systems without level-shifting. |
| Input Offset Voltage | ±750 µV max at VS = 5 V; ensures < 0.015% error in 5 V full-scale instrumentation amplifiers. |
| Gain Bandwidth | 1.5 MHz; supports stable unity-gain operation and accurate 100 kHz signal amplification with minimal phase lag. |
| Quiescent Current | 350 µA max per amplifier; allows dual-channel precision amplification in sub-1 mA total system power budgets. |
| Output Swing | Within 10 mV of ground and up to 0.9 V below V+ (RL = 10 kΩ); permits true single-supply operation with ground-referenced sensors and ADCs. |
| Channel Separation | 1 µV/V; guarantees < 1 µV crosstalk between channels at 1 V differential output, critical for dual-sensor monitoring. |
| Input Noise Density | 28 nV/√Hz at 1 kHz; maintains SNR > 80 dB for 100 mVpp signals in 10 kHz bandwidth applications. |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm, 0.65 mm pitch, thermally enhanced exposed pad (not electrically connected), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output; capable of sourcing up to 9.5 mA and sinking up to 10 mA into resistive or capacitive loads. |
| 2 | –IN A | Inverting input for channel A; high-impedance node (5 TΩ || 2 pF common-mode) requiring guarded layout for low-leakage designs. |
| 3 | +IN A | Noninverting input for channel A; shares same impedance and ESD protection as –IN A; referenced to V– for common-mode range extension. |
| 4 | V– | Negative supply terminal; must be tied to lowest potential (e.g., ground in single-supply mode); establishes reference for input common-mode and output swing. |
| 5 | +IN B | Noninverting input for channel B; electrically isolated from channel A; enables independent dual-signal processing without interaction. |
| 6 | –IN B | Inverting input for channel B; identical electrical characteristics to –IN A; supports matched dual configurations like instrumentation amp front-ends. |
| 7 | OUT B | Amplifier B output; fully independent output stage; no shared internal nodes with OUT A, ensuring < 0.001% inter-channel gain error. |
| 8 | V+ | Positive supply terminal; accepts up to 36 V; powers both amplifiers; requires local 10 nF ceramic bypass to V– for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-ground output | Swings to within 10 mV of V– on single supply, eliminating need for negative rail in ground-referenced sensor interfaces. |
| Low quiescent current | 350 µA max per amplifier enables dual-channel precision amplification in battery-powered devices with multi-year runtime. |
| High CMRR | 86 dB min at 5 V supply rejects common-mode noise from noisy digital supplies or shared analog grounds. |
| Capacitive load drive | Stable with up to 10,000 pF when sourcing current - supports direct connection to long PCB traces or ADC input filters without isolation resistors. |
| Wide supply range | Operates from 2.7 V to 36 V, allowing reuse across 3.3 V microcontroller peripherals and 24 V industrial I/O modules without redesign. |
Applications
| Battery-Powered Medical Sensors | Portable Test Equipment |
|---|---|
Use Scenario: Amplifying low-level ECG or pulse oximetry sensor outputs in handheld diagnostic devices powered by two AA cells (3 V). IC Role / Device Role / Timing Role: Dual-channel DC-coupled signal conditioner: one channel for sensor amplification, second for reference or filtering; no external biasing required due to ground-swing capability. Use Value: 350 µA per amplifier enables >100 hours of continuous operation on 500 mAh batteries; 750 µV offset ensures < 0.5% baseline error in 100 mV full-scale biopotential measurements. | Use Scenario: Signal conditioning front-end in handheld multimeters or portable oscilloscope probes with auto-ranging and AC/DC coupling. IC Role / Device Role / Timing Role: Dual op-amp performing simultaneous high-impedance buffer (channel A) and precision gain stage (channel B) with matched thermal drift. Use Value: 1 µV/V channel separation prevents cross-talk between voltage and current measurement paths; 1.5 MHz GBW supports accurate 100 kHz sine wave reproduction with < 0.1% THD. |
| PCMCIA Data Acquisition Cards | Industrial Sensor Signal Chains |
Use Scenario: Analog front-end for legacy PCMCIA-based data loggers interfacing with thermocouples, strain gauges, and RTDs in field-deployed equipment. IC Role / Device Role / Timing Role: Dual amplifier providing programmable gain (via external resistors) and low-drift offset correction in compact card-edge form factor. Use Value: VSSOP-8 footprint (3.0 × 3.0 mm) saves >60% board area vs SOIC-8; –40°C to +85°C rating ensures reliability in uncontrolled environmental deployments. | Use Scenario: Signal conditioning for 4–20 mA loop-powered transmitters in factory automation, where space and power are constrained. IC Role / Device Role / Timing Role: Dual op-amp implementing current-to-voltage conversion (channel A) and linearized temperature compensation (channel B) using single 24 V supply. Use Value: Input common-mode range extending 0.2 V below V– allows direct sensing of grounded shunt resistors; 86 dB CMRR suppresses 50/60 Hz pickup from adjacent motor drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333AIDR | Zero-drift architecture; 0.02 µV/°C max offset drift vs 7.5 µV/°C for OPA2237EA/2K5; higher IQ (17 µA vs 350 µA). | Better for ultra-low-drift DC applications (e.g., precision weigh scales); less suitable for battery life-critical portable instruments. | Choose OPA2237EA/2K5 when low power and proven stability with large capacitive loads outweigh need for sub-µV drift. |
| LMV358IDR | Lower GBW (1 MHz), higher offset (3.5 mV max), but lower cost and wider temp range (–40°C to +125°C); not specified for <10 mV ground swing. | Suitable for cost-sensitive, non-precision applications like motor control feedback or basic sensor buffering where rail-to-rail output is not required. | Choose OPA2237EA/2K5 when design demands <750 µV offset, 1.5 MHz bandwidth, and guaranteed ground-swing capability in portable medical or test gear. |
Compared with OPA2333AIDR and LMV358IDR, the OPA2237EA/2K5 uniquely balances low quiescent current (350 µA), 750 µV offset, and rail-to-ground output in a miniature VSSOP package - making it optimal for battery-powered precision analog front-ends where power, accuracy, and physical size are simultaneously constrained.
Availability
OPA2237EA/2K5 is available at Aetrix Electronics and suitable for battery-powered medical sensors, portable test equipment, PCMCIA data acquisition cards, and industrial sensor signal chains requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for OPA2237EA/2K5 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 OPA2237EA/2K5 belongs to TI's MicroAmplifier Series - designed specifically for space-constrained, single-supply, low-power precision analog signal conditioning in portable and battery-operated instrumentation.
FAQ
What is the maximum capacitive load the OPA2237EA/2K5 can drive stably?
The OPA2237EA/2K5 remains stable with up to 10,000 pF capacitive loads when sourcing current, and up to 4,000 pF when sinking current. This capability is verified in the Stability-Capacitive Load vs Output Current plot (Figure 6-2) and enables direct interface with ADC input filters or long PCB traces without added isolation resistors - a key advantage over many general-purpose op-amps.
Does the OPA2237EA/2K5 support true single-supply operation with ground-referenced inputs and outputs?
Yes. The OPA2237EA/2K5 features an input common-mode range extending 0.2 V below V– and an output that swings to within 10 mV of V– (ground in single-supply mode). When V– = 0 V and V+ = 5 V, both inputs accept signals down to –0.2 V, and the output reaches as low as 0.01 V - enabling seamless interfacing with ground-referenced sensors and unipolar ADCs without level-shifting circuitry.
What is the operating temperature range specified for the OPA2237EA/2K5?
The OPA2237EA/2K5 is specified for operation from –40°C to +85°C ambient temperature. This range is confirmed in Section 5.2 (Recommended Operating Conditions) and Section 9 (Mechanical, Packaging, and Orderable Information) of the SBOS057B datasheet, and applies to the VSSOP-8 (DGK) package variant denoted by the /2K5 suffix.
How does the OPA2237EA/2K5 compare to the single-channel OPA237 in terms of specifications?
The OPA2237EA/2K5 and single-channel OPA237 share identical electrical specifications - including offset voltage (±750 µV max at 5 V), gain bandwidth (1.5 MHz), quiescent current (350 µA max), and output swing - as explicitly stated in the datasheet description: "Single and dual versions have identical specifications for maximum design flexibility." This allows drop-in functional replacement between channels in dual layouts and simplifies qualification across product variants.
Is the OPA2237EA/2K5 pin-compatible with other dual op-amps in VSSOP-8 packages?
No. While the OPA2237EA/2K5 uses the industry-standard 8-pin VSSOP (DGK) footprint, its pinout (OUT A, –IN A, +IN A, V–, +IN B, –IN B, OUT B, V+) is specific to the OPA2x37 family and differs from common dual op-amp pinouts such as the LMV358 or TLV2372. Engineers must verify pin mapping against Figure 4-3 and Table 4-2 in the SBOS057B datasheet to avoid layout errors during migration or second-source evaluation.
OPA2237EA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 1.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 170µA (x2 Channels)
- 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:
- 8-VSSOP
OPA2237EA/2K5 FAQ
1.How can I place an order for OPA2237EA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2237EA/2K5 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 OPA2237EA/2K5 reliable?
The price and inventory of OPA2237EA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2237EA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA2237EA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2237EA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2237EA/2K5?
OPA2237EA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2237EA/2K5 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 OPA2237EA/2K5?
For technical support, including OPA2237EA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2237EA/2K5 requirements.
6.How does Aetrix verify that OPA2237EA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA2237EA/2K5 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 OPA2237EA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA2237EA/2K5?
All OPA2237EA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2237EA/2K5, 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 OPA2237EA/2K5 part is unused and in its original packaging.
Return procedure for OPA2237EA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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