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Texas Instruments OPA373AIDRG4
- Part No.:
- OPA373AIDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA373AIDRG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,583
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Product details
Overview
OPA373AIDRG4 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 supply. Its shutdown mode reduces current to <1 µA, making it ideal for portable instrumentation and sensor signal conditioning.
For engineers reviewing the OPA373AIDRG4 datasheet, OPA373AIDRG4 pinout, OPA373AIDRG4 application, or OPA373AIDRG4 equivalent, key selection criteria include rail-to-rail I/O swing (≤25 mV from rails), ultra-low input bias current (≤10 pA), and guaranteed operation up to 125°C - critical for high-precision, thermally constrained designs.
Technical Context
The OPA373AIDRG4 uses a complementary CMOS input stage enabling rail-to-rail input common-mode 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 typical output voltage swing within 18 mV of V+ and V− at 25°C.
It features logic-controlled shutdown (Enable pin) that disables the amplifier and reduces quiescent current to <1 µA. The device is unity-gain stable and specified across –40°C to +125°C, with electrical characteristics validated at 2.7 V to 5.5 V supply and tested with 10 kΩ load referenced to VS/2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 6.5 MHz - enables stable closed-loop operation up to ~500 kHz at G = +10 without compensation |
| Slew rate | 5 V/µs - supports fast settling of 2-V step inputs in ≤1.5 µs (0.01% accuracy) |
| Input bias current | ≤10 pA max - minimizes offset error in high-impedance sensor interfaces (e.g., photodiode, pH electrode) |
| Input offset voltage | ≤5 mV max - ensures ≤0.1% gain error in unity-gain buffer configurations with 5 V full-scale |
| Supply voltage range | 2.3 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V), 3.3 V logic, and dual AA/AAA battery systems |
| Quiescent current | 585–750 µA per amplifier - balances speed and power for always-on sensing nodes |
| Shutdown current | <1 µA - extends battery life during idle periods in duty-cycled measurement systems |
Pinout & Package
OPA373AIDRG4 is packaged in an 8-pin SOIC (D package) with 4.90 mm × 3.91 mm body size. Pin 1 is marked with a dot or beveled corner; orientation follows standard TI SOIC top-view convention.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left floating or tied to ground per layout best practice |
| 2 | –IN | Inverting input - accepts differential signal referenced to noninverting input; high-impedance node |
| 3 | +IN | Noninverting input - primary signal reference point; matched to –IN for optimal CMRR |
| 4 | V– | Negative supply terminal - connects to system ground or lowest potential rail (e.g., 0 V) |
| 5 | NC | No internal connection - electrically isolated; no routing required |
| 6 | OUT | Amplifier output - drives resistive or capacitive loads up to 250 pF in unity-gain configuration |
| 7 | V+ | Positive supply terminal - accepts 2.3–5.5 V; decoupling capacitor (0.1 µF) required near pin |
| 8 | Enable | Active-high shutdown control - logic high (>2 V above V–) enables operation; low disables amplifier |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Common-mode range extends from (V–) – 0.2 V to (V+) + 0.2 V - preserves dynamic range in low-voltage ADC front-ends |
| Rail-to-rail output | Swings within 18 mV of rails at light load - maximizes usable signal swing in 3.3 V or lower systems |
| Ultra-low input bias current | ≤10 pA - eliminates significant offset drift in high-Z transducer interfaces without external guard traces |
| Shutdown mode | Logic-controlled enable pin reduces IQ to <1 µA - enables microamp-level system sleep states |
| High temperature rating | Specified from –40°C to +125°C - supports automotive cabin, industrial motor control, and outdoor sensor deployments |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Amplifying low-level signals from electrochemical sensors (e.g., glucose strips) in handheld diagnostic devices. IC Role / Device Role: Precision DC-coupled buffer and gain stage preceding 12-bit SAR ADC. Use Value: 10 pA input bias prevents polarization errors in µA-range sensor currents; rail-to-rail I/O captures full 0–3.3 V ADC range. |
Use Scenario: Signal conditioning for thermistor and humidity sensor outputs in field-deployed environmental monitors. IC Role / Device Role: Low-drift, low-power amplifier driving multiplexed analog inputs. Use Value: 585 µA quiescent current enables multi-year battery life; shutdown mode cuts leakage during 99% idle time. |
| Active Filter for Audio Front-End | Industrial 4–20 mA Loop Receiver |
Use Scenario: 2nd-order anti-aliasing filter before audio codec in voice-enabled IoT edge nodes. IC Role / Device Role: Unity-gain stable Sallen-Key topology amplifier with 6.5 MHz GBW. Use Value: 5 V/µs slew rate prevents distortion on 20 kHz sine waves; rail-to-rail output avoids clipping at 3.3 V supply. |
Use Scenario: Converting 4–20 mA loop current to 0–5 V voltage for PLC analog input modules. IC Role / Device Role: Precision current-to-voltage converter with 250 Ω shunt resistor interface. Use Value: 5 mV max offset ensures ≤0.1% full-scale error; 125°C rating supports operation near hot industrial enclosures. |
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; 0.1 µV/°C offset drift vs. 3 µV/°C for OPA373AIDRG4; higher cost; 350 kHz GBW | Better for DC-critical applications (e.g., precision weigh scales); insufficient bandwidth for audio filtering | Select OPA333AIDBVR when offset drift dominates error budget over bandwidth needs |
| MCP6001T-E/OT | Lower bandwidth (1 MHz); higher input bias (1 pA typical but not guaranteed max); no shutdown pin; SOT-23-5 package | Suitable for basic sensor buffering where shutdown and 6.5 MHz are unnecessary | Select MCP6001T-E/OT only when cost sensitivity outweighs need for shutdown control and extended bandwidth |
Compared with OPA333AIDBVR and MCP6001T-E/OT, the OPA373AIDRG4 uniquely balances 6.5 MHz bandwidth, shutdown capability, rail-to-rail I/O, and 125°C operation - making it the optimal choice for thermally demanding, battery-constrained signal chains requiring both speed and power control.
Availability
OPA373AIDRG4 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, active audio filters, and industrial 4–20 mA loop receivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA373AIDRG4 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 battery-powered, space-constrained applications demanding rail-to-rail performance, low quiescent current, and robust operation from –40°C to +125°C - targeting portable instrumentation and industrial sensing.
FAQ
What is the maximum operating temperature for OPA373AIDRG4?
The OPA373AIDRG4 is fully specified and tested from –40°C to +125°C ambient temperature. Its electrical characteristics, including offset voltage, gain-bandwidth, and quiescent current, are guaranteed across this full industrial temperature range - enabling reliable deployment in automotive engine compartments, factory-floor controllers, and outdoor environmental sensors.
Does OPA373AIDRG4 support true rail-to-rail input and output?
Yes. The OPA373AIDRG4 provides rail-to-rail input with a common-mode range from (V–) – 0.2 V to (V+) + 0.2 V, and rail-to-rail output capable of swinging within 18 mV of both supply rails under light loads (100 kΩ). This preserves maximum dynamic range in low-voltage systems such as 3.3 V or single-cell battery supplies.
How does the Enable pin function on OPA373AIDRG4?
The Enable pin (Pin 8) is an active-high logic control: applying ≥2 V above V– enables normal operation, while pulling ≤0.8 V above V– places the amplifier in shutdown mode, reducing quiescent current to <1 µA. No external pull-up/down is required; the pin has 0.2 µA input bias current and is TTL/CMOS compatible.
Can OPA373AIDRG4 drive capacitive loads?
Yes - the OPA373AIDRG4 is unity-gain stable and can safely drive up to 250 pF with minimal overshoot. For larger capacitive loads (e.g., ADC input capacitance + PCB trace), adding a small series resistor (10–20 Ω) between the output and load restores phase margin without degrading DC accuracy.
What is the typical quiescent current of OPA373AIDRG4 at 3.3 V supply?
At 3.3 V supply and 25°C, the OPA373AIDRG4 draws 585–750 µA quiescent current in active mode. This value increases to ≤800 µA across the full –40°C to +125°C operating range. In shutdown mode, current drops below 1 µA - critical for extending battery life in intermittent-sampling applications.
OPA373AIDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
OPA373AIDRG4 FAQ
1.How can I place an order for OPA373AIDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA373AIDRG4 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 OPA373AIDRG4 reliable?
The price and inventory of OPA373AIDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA373AIDRG4 is usually 5 days.
3.What payment methods are accepted for OPA373AIDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA373AIDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA373AIDRG4?
OPA373AIDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA373AIDRG4 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 OPA373AIDRG4?
For technical support, including OPA373AIDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA373AIDRG4 requirements.
6.How does Aetrix verify that OPA373AIDRG4 is sourced from the original manufacturer or authorized distributors?
All OPA373AIDRG4 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 OPA373AIDRG4 meets industry standards.
7.What is the process for return or replacement of OPA373AIDRG4?
All OPA373AIDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA373AIDRG4, 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 OPA373AIDRG4 part is unused and in its original packaging.
Return procedure for OPA373AIDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA373AIDRG4 Tags
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