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Texas Instruments OPA373AIDG4
- Part No.:
- OPA373AIDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA373AIDG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,483
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Product details
Overview
OPA373AIDG4 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 OPA373AIDG4 datasheet, OPA373AIDG4 pinout, OPA373AIDG4 application, or OPA373AIDG4 equivalent, key selection criteria include its rail-to-rail I/O swing (within 25 mV of rails), ultra-low input bias current (≤10 pA), 5 mV max offset voltage, and operation up to +125°C - all in a space-constrained 8-pin SOIC package.
Technical Context
The OPA373AIDG4 uses a complementary N/P-channel input stage enabling rail-to-rail common-mode input range extending 200 mV beyond both supply rails. Its class AB output stage supports rail-to-rail output swing under light loads (≤100 kΩ), with output voltage typically within 18 mV of V+ or V− at 25°C.
It features logic-controlled shutdown (Enable pin) that disables the amplifier and reduces quiescent current to <1 µA. The device maintains stability driving capacitive loads up to 250 pF in unity-gain configuration and is specified across –40°C to +125°C for industrial and automotive-adjacent applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 6.5 MHz - enables stable unity-gain operation and supports bandwidth-critical signal chains up to ~6 MHz. |
| Slew rate | 5 V/µs - supports fast settling of 2-V steps in ≤1 µs (0.1%) for data acquisition front-ends. |
| Input bias current | ≤10 pA (max) - minimizes voltage error in high-impedance sensor interfaces (e.g., photodiode, pH electrode). |
| Input offset voltage | ≤5 mV (max) - ensures DC accuracy in precision amplification without external trimming. |
| Supply voltage range | 2.3 V to 5.5 V - compatible with single-cell Li-ion, 3.3 V, and 5 V systems without level-shifting. |
| Operating temperature | –40°C to +125°C - qualified for extended-temperature industrial and under-hood automotive subsystems. |
| Shutdown current | <1 µA - enables ultra-low-power sleep modes in portable devices with periodic wake-up cycles. |
Pinout & Package
OPA373AIDG4 is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with exposed thermal pad on underside connected to V− for improved thermal performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection; must be left floating or grounded per layout best practice. |
| 2 | –IN | Inverting input terminal; accepts differential signals with rail-to-rail common-mode range (V− −0.2 V to V+ +0.2 V). |
| 3 | +IN | Noninverting input terminal; same rail-to-rail common-mode capability as –IN. |
| 4 | V− | Negative supply pin; also serves as thermal reference for exposed die pad (must be connected to system ground plane). |
| 5 | NC | No internal connection; electrically isolated; no routing required. |
| 6 | OUT | Amplifier output; delivers rail-to-rail swing (within 25 mV of rails) into ≥100 kΩ loads. |
| 7 | V+ | Positive supply pin; supports 2.3 V to 5.5 V operation; decoupling capacitor required near pin. |
| 8 | Enable | Active-high shutdown control; drives amplifier into sub-1-µA quiescent state when logic low (≤0.8 V). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in low-voltage (e.g., 3.3 V) systems without supply headroom loss. |
| Shutdown mode with Enable pin | Reduces total system power by disabling amplifier core while preserving PCB footprint and signal path integrity. |
| Ultra-low input bias current (≤10 pA) | Eliminates significant offset errors in high-Z transducer interfaces, avoiding need for guard traces or active guarding. |
| Specified up to +125°C | Supports deployment in thermally demanding environments such as motor control feedback loops or engine management sensors. |
| 6.5-MHz GBW at 585 µA | Delivers high-speed performance with minimal power penalty-ideal for portable oscilloscopes and handheld test equipment. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Amplifying low-level analog outputs from wearable ECG electrodes or pulse oximetry photodiodes. IC Role / Device Role: Precision, low-noise signal conditioning stage before ADC sampling. Use Value: Rail-to-rail I/O preserves full sensor dynamic range at 3.3 V supply; 10 pA IB prevents loading of high-impedance biopotential sources. |
Use Scenario: Signal buffering and anti-aliasing filtering in multi-channel environmental monitoring nodes powered by coin cells. IC Role / Device Role: Low-power op-amp in sensor front-end with periodic shutdown between measurement cycles. Use Value: 585 µA IQ and sub-1 µA shutdown current extend battery life; 6.5 MHz GBW supports oversampling filter design. |
| Active Filters for Audio Interfaces | Driving SAR ADC Inputs |
Use Scenario: Implementing 2nd-order Sallen-Key low-pass filters in USB-C audio adapters or Bluetooth speaker DAC outputs. IC Role / Device Role: Unity-gain stable, low-distortion buffer/filter amplifier. Use Value: 0.0013% THD+N at 1 kHz and rail-to-rail output ensure clean audio signal delivery without clipping. |
Use Scenario: Driving the switched-capacitor input of 12-bit to 16-bit SAR ADCs in industrial PLC analog input modules. IC Role / Device Role: High-speed, low-output-impedance driver with fast settling (≤1.5 µs, 0.01%). Use Value: 5 V/µs slew rate and 1 µs settling guarantee accurate sampling even at 1 MSPS ADC rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA373AIDR | Same silicon, tape-and-reel packaging (SOIC-8); identical electrical specs and pinout. | No functional difference; selected for automated SMT assembly vs. tube-based prototyping. | Choose OPA373AIDR for volume production; OPA373AIDG4 for evaluation and small-batch builds. |
| OPA374AIDG4 | No shutdown function; otherwise identical GBW (6.5 MHz), IQ (585 µA), and rail-to-rail I/O. | Used where continuous operation is required and power cycling is not needed - e.g., always-on sensor hubs. | Select OPA374AIDG4 only if shutdown capability is unnecessary; OPA373AIDG4 provides design flexibility for power gating. |
Compared with OPA373AIDR, OPA373AIDG4 offers identical performance in tube packaging for lab use; compared with OPA374AIDG4, it adds enable-controlled shutdown - critical for duty-cycled systems where µA-level sleep current directly impacts battery runtime.
Availability
OPA373AIDG4 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, active audio filters, and SAR ADC driver applications requiring stable component supply and extended-temperature qualification.
Supply support for OPA373AIDG4 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 deep expertise in precision amplifiers, power management, and signal chain ICs.
The OPA373 family was designed specifically for low-power, rail-to-rail signal conditioning in space- and energy-constrained applications - emphasizing speed-per-microamp efficiency and robust operation across industrial temperature ranges.
FAQ
What is the maximum operating supply voltage for OPA373AIDG4?
The absolute maximum supply voltage for OPA373AIDG4 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 below 2.3 V may cause degraded AC performance or failure to meet datasheet specifications. Always refer to the Recommended Operating Conditions table in the official OPA373AIDG4 datasheet for validated limits.
Does OPA373AIDG4 support true rail-to-rail input and output?
Yes, OPA373AIDG4 supports rail-to-rail input (common-mode range extends to V− −0.2 V and V+ +0.2 V) and rail-to-rail output (swing within 18 mV of rails into 100 kΩ at 25°C). This is enabled by its complementary input stage and class AB output architecture - confirmed in Section 8.3.3 and 8.3.4 of the SBOS279F datasheet.
How does the Enable pin on OPA373AIDG4 function?
The Enable pin (Pin 8) is active-high: logic high (≥2 V relative to V−) enables normal operation; logic low (≤0.8 V) places the amplifier in shutdown mode, reducing quiescent current to <1 µA. The turnon time is 12 µs and turnoff time is 3 µs - values measured under CL = 100 pF conditions per the Electrical Characteristics table.
Can OPA373AIDG4 drive capacitive loads reliably?
Yes - OPA373AIDG4 is stable driving up to 250 pF in unity-gain configuration. For larger loads, adding a small series resistor (10 Ω to 20 Ω) between the output and capacitive load improves phase margin. This behavior is documented in Figure 17 and Section 8.3.5 of the SBOS279F datasheet.
Is OPA373AIDG4 qualified for operation at +125°C?
Yes, OPA373AIDG4 is fully specified and tested over –40°C to +125°C ambient temperature. Key parameters including offset voltage (6.5 mV max), open-loop gain (80 dB min), and output swing (25 mV from rail) are guaranteed across this range - per Section 7.3 and Table 7.9 of the SBOS279F datasheet.
OPA373AIDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
OPA373AIDG4 FAQ
1.How can I place an order for OPA373AIDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA373AIDG4 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 OPA373AIDG4 reliable?
The price and inventory of OPA373AIDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA373AIDG4 is usually 5 days.
3.What payment methods are accepted for OPA373AIDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA373AIDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA373AIDG4?
OPA373AIDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA373AIDG4 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 OPA373AIDG4?
For technical support, including OPA373AIDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA373AIDG4 requirements.
6.How does Aetrix verify that OPA373AIDG4 is sourced from the original manufacturer or authorized distributors?
All OPA373AIDG4 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 OPA373AIDG4 meets industry standards.
7.What is the process for return or replacement of OPA373AIDG4?
All OPA373AIDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA373AIDG4, 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 OPA373AIDG4 part is unused and in its original packaging.
Return procedure for OPA373AIDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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