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Texas Instruments OPA337EA
- Part No.:
- OPA337EA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- -
- Datasheet:
-
OPA337EA.pdf
- Description:
- OP AMP, LOW COST COMO-RESIDUAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,220
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Product details
Overview
OPA337EA from Texas Instruments is a rail-to-rail output, unity-gain stable CMOS operational amplifier in MSOP-8 package, featuring 3MHz gain-bandwidth, 1.2V/µs slew rate, 120dB open-loop gain, 10pA max input bias current, and operation from 2.5V to 5.5V single supply - ideal for photodiode pre-amplification in portable medical instruments.
For engineers reviewing the OPA337EA datasheet, OPA337EA pinout, OPA337EA application, or OPA337EA equivalent, key selection criteria include rail-to-rail output swing (≤125mV from rails), low quiescent current (525µA/amp), FET-input impedance (>10¹³Ω), input common-mode range extending to ground, and G = 1 stability without external compensation.
Technical Context
The OPA337EA employs advanced CMOS process technology to achieve ultra-low input bias current and high open-loop gain while maintaining unity-gain stability. Its input stage includes ESD-protected FET inputs with differential impedance >10¹³Ω and common-mode rejection ratio of 74–90dB over −0.2V to (V+)−1.2V range.
It delivers rail-to-rail output swing into 25kΩ loads (125mV from rails at TA = −40°C to +85°C) and maintains 100dB open-loop gain down to 5kΩ loads. The device operates across 2.5V–5.5V supply with quiescent current tightly specified at 0.525–1.2mA per amplifier and thermal resistance of 150°C/W in MSOP-8 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz at G = 1 - enables stable amplification of signals up to ~300kHz with minimal phase margin degradation |
| Slew Rate | 1.2V/µs - supports 2V step response settling to 0.1% in 2µs with 100pF load |
| Input Bias Current | ±10pA max - preserves signal integrity in high-impedance photodiode and sensor interfaces |
| Open-Loop Gain | 120dB typ - ensures <0.001% gain error in precision DC-coupled configurations |
| Supply Voltage Range | 2.5V to 5.5V - compatible with Li-ion, coin-cell, and regulated 3.3V systems without level-shifting |
| Quiescent Current | 525µA/amp - allows dual-channel operation in battery-powered instruments for >1000-hour runtime |
| Output Swing | 125mV from rails (RL = 25kΩ) - maximizes dynamic range in single-supply data acquisition front-ends |
Pinout & Package
OPA337EA is packaged in an 8-pin MSOP (VSSOP) package (DGK), 3.0mm × 3.0mm × 1.0mm body, RoHS-compliant, moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V− | Negative supply rail connection - referenced to system ground in single-supply operation |
| 2 | +In | Non-inverting input - accepts signals down to (V−) − 0.2V, enabling true ground-referenced sensing |
| 3 | −In | Inverting input - high-impedance node for feedback networks or transimpedance configurations |
| 4 | Out | Amplifier output - rail-to-rail capable, drives 25kΩ loads to within 125mV of V− or V+ |
| 5 | NC | No connection - internally unconnected; must remain floating or grounded per layout guidelines |
| 6 | NC | No connection - internally unconnected; no routing or soldering required |
| 7 | V+ | Positive supply rail - accepts 2.5V–5.5V; bypass with 0.01µF ceramic capacitor near pin |
| 8 | NC | No connection - internally unconnected; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full-scale analog output in single-supply systems without negative rail, reducing BOM count and PCB area |
| FET-input architecture | Enables direct interfacing with high-impedance sources like photodiodes and piezoelectric sensors without signal loading |
| Unity-gain stable | Operates reliably at G = 1 without external compensation components - simplifies design and improves phase margin |
| Low quiescent current | 525µA/amp enables dual op-amp integration in space-constrained, battery-operated devices without thermal derating |
| Input common-mode range includes ground | Supports direct coupling of 0V-referenced sensors and eliminates need for input biasing resistors or level shifters |
Applications
| Photodiode Pre-Amp | Portable Medical Instrumentation |
|---|---|
Use Scenario: Amplifying weak current from reverse-biased photodiodes in pulse oximeters or blood analyzers. IC Role / Device Role / Timing Role: Transimpedance amplifier converting pA-level photocurrent to measurable voltage with minimal noise and offset drift. Use Value: 10pA max input bias current prevents signal corruption; rail-to-rail output maximizes ADC input range from 3.3V supplies. | Use Scenario: Signal conditioning front-end in handheld ECG or glucose meters operating on coin-cell batteries. IC Role / Device Role / Timing Role: Low-power, precision buffer and gain stage preceding 12-bit SAR ADCs such as ADS7822. Use Value: 525µA quiescent current extends battery life; 2.5V minimum supply enables direct use with CR2032 cells. |
| Battery-Powered Test Equipment | Audio System Input Stage |
Use Scenario: Portable multimeter or signal tracer requiring accurate DC and low-frequency AC amplification. IC Role / Device Role / Timing Role: High-input-impedance voltage follower and attenuator driver ensuring measurement fidelity across 1mV–10V ranges. Use Value: 120dB open-loop gain guarantees <0.001% gain error; 3MHz bandwidth supports calibration tone generation up to 300kHz. | Use Scenario: Line-level input buffer in Bluetooth speakers or hearing aids where size and power are critical. IC Role / Device Role / Timing Role: Single-supply audio buffer isolating source impedance while preserving THD+N ≤0.001% at 1kHz. Use Value: Rail-to-rail output delivers full 3VPP swing into 10kΩ loads; CMOS input avoids capacitor-coupled bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA337NA/250 | SOT23-5 package (5-pin), same electrical specs, lower thermal resistance (200°C/W vs 150°C/W) | Space-constrained PCBs where MSOP-8 footprint is prohibitive; requires different land pattern and stencil | Select when board area is more critical than thermal performance or when existing SOT23-5 layout exists |
| OPA340UA/2K5 | Higher GBW (5.5MHz), higher slew rate (6V/µs), same MSOP-8 package, but not unity-gain stable (min G = 5) | Applications needing wider bandwidth at gain ≥5, e.g., active filters or higher-speed sensor interfaces | Choose only if gain ≥5 is guaranteed; requires compensation network for G = 1 use - not drop-in |
Compared with OPA337NA/250, OPA337EA offers better thermal dissipation in compact layouts; versus OPA340UA/2K5, it provides guaranteed unity-gain stability without external components but trades off bandwidth and slew rate for robustness in low-gain configurations.
Availability
OPA337EA is available at Aetrix Electronics and suitable for photodiode pre-amplifiers, portable medical instrumentation, and battery-powered test equipment requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for OPA337EA 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 op amps and low-power signal chain solutions.
The OPA337EA belongs to TI's MicroAmplifier™ series, designed specifically for miniature, single-supply applications demanding rail-to-rail output, ultra-low input bias current, and unity-gain stability in space- and power-constrained systems.
FAQ
What is the maximum operating temperature range for the OPA337EA?
The OPA337EA is specified for operation from −40°C to +85°C ambient temperature, with absolute maximum junction temperature rated at 150°C. Storage and operating temperature limits both extend to −55°C to +125°C, supporting deployment in industrial and automotive-adjacent environments where thermal cycling occurs. This range is validated per JEDEC JESD22-A108.
Does the OPA337EA require external compensation for unity-gain operation?
No, the OPA337EA is internally compensated for unity-gain stability and requires no external capacitors or resistors to operate stably at G = 1. This is confirmed in the datasheet's "DESCRIPTION" section and verified by the "G = 1 STABLE" designation in the package table. Adding compensation would degrade bandwidth and is unnecessary for standard buffer or gain-of-one configurations.
What is the input common-mode voltage range of the OPA337EA?
The OPA337EA supports an input common-mode voltage range from (V−) − 0.2V to (V+) − 1.2V, explicitly including ground in single-supply operation. At VS = 5V, this spans −0.2V to +3.8V. This feature eliminates the need for input biasing networks when interfacing with 0V-referenced sensors, directly enabling true single-supply photodiode or thermistor front-ends.
Can the OPA337EA drive capacitive loads without instability?
The OPA337EA can drive up to 100pF capacitive loads while maintaining 0.1% settling in 2µs, as characterized in the datasheet. For loads exceeding 100pF, isolation resistance (e.g., 10–50Ω in series with the output) is recommended to preserve phase margin. The device does not include internal capacitive-load compensation, so layout parasitics must be minimized in high-frequency applications.
Is the OPA337EA pin-compatible with other op amps in the OPA337 family?
Yes - the OPA337EA (MSOP-8/DGK) shares identical pinout with OPA337UA (SO-8/D) and OPA337PA (DIP-8/P) for pins 1–4 and 7–8; pins 5–6 are NC in all variants. However, thermal and package parasitics differ significantly: MSOP-8 has 150°C/W θJA versus 150°C/W for SO-8 but 100°C/W for DIP-8. Layout and thermal design must be validated per package.
OPA337EA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- -
- Number of Circuits:
- -
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- -
- Voltage - Supply Span (Max):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
OPA337EA FAQ
1.How can I place an order for OPA337EA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA337EA 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 OPA337EA reliable?
The price and inventory of OPA337EA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA337EA is usually 5 days.
3.What payment methods are accepted for OPA337EA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA337EA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA337EA?
OPA337EA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA337EA 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 OPA337EA?
For technical support, including OPA337EA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA337EA requirements.
6.How does Aetrix verify that OPA337EA is sourced from the original manufacturer or authorized distributors?
All OPA337EA 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 OPA337EA meets industry standards.
7.What is the process for return or replacement of OPA337EA?
All OPA337EA units undergo pre-shipment inspection (PSI). If there is an issue with OPA337EA, 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 OPA337EA part is unused and in its original packaging.
Return procedure for OPA337EA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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