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Texas Instruments OPA373AID
- Part No.:
- OPA373AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA373AID.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,654
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Product details
Overview
OPA373AID from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, battery-operated systems. It delivers 6.5 MHz gain-bandwidth, 5 V/µs slew rate, and 585 µA quiescent current per amplifier while operating from 2.3 V to 5.5 V. Its shutdown mode reduces supply current to <1 µA, making it ideal for portable instrumentation and sensor signal conditioning.
For engineers reviewing the OPA373AID datasheet, OPA373AID pinout, OPA373AID application, or OPA373AID equivalent, key selection criteria include its 5 mV max input offset voltage, 10 pA max input bias current, rail-to-rail I/O swing within 25 mV of rails, operation up to 125°C, and availability in SOIC-8 package with verified enable control functionality.
Technical Context
The OPA373AID employs a complementary input stage-N-channel and P-channel differential pairs-to achieve rail-to-rail input common-mode range extending 200 mV beyond both supply rails. This architecture enables stable operation across the full 2.3 V–5.5 V supply range without phase inversion, even when inputs exceed rails (with current limiting).
Its class AB output stage supports rail-to-rail output swing: typically within 18 mV of rails at light loads (100 kΩ) and within 125 mV at 5 kΩ loads across –40°C to 125°C. The device is unity-gain stable and specified with 6.5 MHz GBW and 5 V/µs slew rate under 100 pF capacitive load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 6.5 MHz - Enables stable unity-gain buffering and closed-loop amplification up to ~5 MHz with adequate phase margin. |
| Slew rate | 5 V/µs - Supports clean 1-MHz, 5-VPP small-signal output without distortion; sufficient for fast-settling sensor interfaces. |
| Input offset voltage | 5 mV (max) - Limits DC error in precision gain stages; drift ≤3 µV/°C ensures stability over industrial temperature range. |
| Supply current | 585 µA (typ) - Enables multi-year battery life in always-on portable devices; drops to <1 µA in shutdown mode. |
| Input bias current | 10 pA (max) - Minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiode transimpedance inputs). |
| Rail-to-rail I/O | Input: (V−) −0.2 V to (V+) + 0.2 V; Output: within 25 mV of rails - Maximizes dynamic range in low-voltage (e.g., 3.3 V or 2.5 V) systems. |
| Operating temperature | –40°C to +125°C - Qualified for automotive cabin, industrial motor control, and outdoor sensor node applications. |
Pinout & Package
OPA373AID is packaged in an 8-pin SOIC (D package) with 4.90 mm × 3.91 mm body size. The exposed thermal pad on underside is not present in this variant; all pins are surface-mount compatible with standard reflow profiles.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Enable | Active-high digital control: drives amplifier into shutdown state (<1 µA IQ) when logic low; requires ≥(V−)+2 V to activate. |
| 2 | –IN | Inverting input terminal; accepts signals from (V−) −0.2 V to (V+) + 0.2 V; 10 pA max IB enables high-Z source interfacing. |
| 3 | +IN | Noninverting input terminal; identical common-mode range and bias current spec as Pin 2. |
| 4 | V− | Negative supply rail connection; must be tied to system ground or negative reference; serves as return path for input bias currents. |
| 5 | NC | No internal connection - electrically isolated; may be left floating or grounded for mechanical stability (no functional impact). |
| 6 | OUT | Amplifier output; delivers rail-to-rail swing (within 25 mV) into ≥5 kΩ loads; capable of driving 100 pF directly. |
| 7 | V+ | Positive supply rail; accepts 2.3 V to 5.5 V; PSRR ≥128 dB at DC ensures immunity to supply noise in mixed-signal systems. |
| 8 | NC | No internal connection - electrically isolated; no routing or grounding required. |
Key Features
| Feature | Design Value |
|---|---|
| Shutdown mode with logic-enable | Reduces total supply current to <1 µA per amplifier, enabling ultra-low-power sleep states in microcontroller-based data loggers. |
| Extended input common-mode range | Operates with inputs 200 mV beyond rails - eliminates level-shifting requirements in single-supply front-end designs. |
| Low input bias current (10 pA max) | Preserves signal integrity when interfacing with megohm-range sensors (e.g., thermistors, piezoelectric elements) without added error. |
| High open-loop gain (94 dB min) | Ensures <0.1% gain error in 100× closed-loop configurations, critical for precision analog front-ends in medical and test equipment. |
| Specified performance at 125°C | Validates reliability in under-hood automotive modules, industrial PLC I/O, and high-ambient-temperature edge AI inference nodes. |
Applications
| Portable Medical Sensors | Battery-Powered Data Acquisition |
|---|---|
|
Use Scenario: Amplifying weak bio-potential signals (ECG, EMG) from dry electrodes in handheld diagnostic tools. IC Role / Device Role / Timing Role: Single-supply, rail-to-rail input/output op amp configured as noninverting amplifier with programmable gain. Use Value: 10 pA input bias current prevents electrode polarization; 5 mV offset minimizes baseline drift; shutdown extends battery life between measurements. |
Use Scenario: Signal conditioning for 16-bit SAR ADC inputs in wireless environmental monitoring nodes. IC Role / Device Role / Timing Role: Buffer and level-shifter driving ADC reference and input channels with minimal settling time. Use Value: 6.5 MHz GBW and 5 V/µs slew rate ensure <1 µs 0.1% settling for 100-kSPS sampling; rail-to-rail output maximizes ADC dynamic range. |
| Industrial Temperature Transmitters | Automotive Cabin Air Quality Modules |
|
Use Scenario: Conditioning resistance-to-voltage outputs from Pt100 RTDs in 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with programmable gain and cold-junction compensation. Use Value: Specified operation to 125°C ensures accuracy in hot industrial enclosures; low power allows operation within loop power budget. |
Use Scenario: Signal amplification for NDIR CO₂ and VOC sensors in HVAC control units mounted near vehicle dashboards. IC Role / Device Role / Timing Role: Low-noise, low-drift amplifier in analog sensor interface chain prior to MCU ADC sampling. Use Value: 3 µV/°C offset drift maintains calibration stability across cabin temperature swings; shutdown disables during vehicle sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA374AID | No shutdown pin; otherwise identical GBW (6.5 MHz), supply range (2.3–5.5 V), and rail-to-rail I/O. | Preferred where continuous operation is required and board space permits removal of enable logic. | Select OPA374AID if shutdown functionality is unnecessary and lower BOM count is prioritized. |
| MCP6001T-I/SN | Lower bandwidth (1 MHz), higher offset (1.5 mV typ), no shutdown, but lower quiescent current (100 µA). | Better suited for ultra-low-power, low-speed sensor buffering where speed is not critical. | Choose MCP6001T-I/SN only for sub-100-kHz applications with strict µA-level current budgets and no need for 6.5 MHz performance. |
Compared with OPA373AID, OPA374AID removes shutdown capability but simplifies layout and reduces component count, while MCP6001T-I/SN trades significant bandwidth and precision for ultra-low quiescent current - making OPA373AID the optimal balance of speed, accuracy, and power control in portable industrial and medical systems.
Availability
OPA373AID is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data acquisition, industrial temperature transmitters, and automotive cabin air quality modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA373AID 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 OPA373 family was designed specifically for portable, battery-constrained applications demanding rail-to-rail operation, low offset, and integrated power management - targeting medical wearables, IoT sensor nodes, and industrial handheld instruments.
FAQ
What is the maximum operating supply voltage for OPA373AID?
The absolute maximum supply voltage for OPA373AID is 7 V, but the recommended operating range is 2.3 V to 5.5 V. Operation above 5.5 V risks permanent damage, while operation down to 2.3 V maintains full functionality including shutdown mode and rail-to-rail I/O performance. Always observe the 7 V absolute maximum rating to prevent junction breakdown.
Does OPA373AID require external components to enter shutdown mode?
No, OPA373AID enters shutdown mode when the Enable pin (Pin 1) is driven to a logic low level ≤(V−)+0.8 V. No external pull-down resistor is required, though a series resistor (≤10 kΩ) is recommended for ESD protection. In shutdown, quiescent current drops to <1 µA per amplifier, and output enters high-impedance state.
Can OPA373AID drive a 100-pF capacitive load in unity-gain configuration?
Yes, OPA373AID is unity-gain stable and characterized to drive up to ~250 pF capacitive loads without oscillation. At 100 pF, it exhibits <1% overshoot and settles to 0.1% in <1 µs. For loads >250 pF, adding a 10–20 Ω isolation resistor in series with the output restores stability while maintaining signal fidelity.
How does the input common-mode range of OPA373AID compare to standard rail-to-rail op amps?
OPA373AID extends its input common-mode range 200 mV beyond both supply rails - i.e., from (V−) −0.2 V to (V+) + 0.2 V - exceeding typical rail-to-rail specs. This eliminates need for external level shifters when interfacing with signals that swing slightly outside the supply domain, such as AC-coupled sensor outputs or DAC references.
Is OPA373AID pin-compatible with other members of the OPAx373 family?
OPA373AID (SOIC-8) shares the same pinout as OPA2373 and OPA4373 in SOIC packages, but differs from OPA373 variants in SOT-23 (6-pin) and VSON (10-pin) packages. Pin compatibility is guaranteed only within the same package type; cross-package substitution requires PCB redesign due to differing enable pin placement and NC pin locations.
OPA373AID 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:
- Rail-to-Rail
- Slew Rate:
- 5V/µs
- Gain Bandwidth Product:
- 6.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 585µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.3 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA373AID FAQ
1.How can I place an order for OPA373AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA373AID 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 OPA373AID reliable?
The price and inventory of OPA373AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA373AID is usually 5 days.
3.What payment methods are accepted for OPA373AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA373AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA373AID?
OPA373AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA373AID 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 OPA373AID?
For technical support, including OPA373AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA373AID requirements.
6.How does Aetrix verify that OPA373AID is sourced from the original manufacturer or authorized distributors?
All OPA373AID 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 OPA373AID meets industry standards.
7.What is the process for return or replacement of OPA373AID?
All OPA373AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA373AID, 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 OPA373AID part is unused and in its original packaging.
Return procedure for OPA373AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA373AID Tags
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LM358DT
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LM358DR
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