My Inquiry
My Account
Texas Instruments OPA373AIDR
- Part No.:
- OPA373AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA373AIDR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,499
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA373AIDR 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, 585 µA quiescent current, and 5 mV maximum input offset voltage across –40°C to 125°C, enabling precision signal conditioning in portable medical sensors and handheld test equipment.
For engineers reviewing the OPA373AIDR datasheet, OPA373AIDR pinout, OPA373AIDR application, or OPA373AIDR equivalent, this page provides verified specifications, validated pin functions for the SOIC-8 package, confirmed shutdown behavior, real-world application constraints (e.g., 2.3 V–5.5 V supply, 25 mV output swing at 125°C), and two technically documented alternative parts with explicit functional and packaging differences.
Technical Context
The OPA373AIDR uses a complementary differential input stage-N-channel and P-channel pairs-to achieve rail-to-rail input operation extending 200 mV beyond both supply rails. Its class AB output stage supports rail-to-rail output swing within 25 mV of rails under light loads (100 kΩ) and maintains >80 dB CMRR over –40°C to 125°C.
It features logic-controlled shutdown with <1 µA standby current, 5 V/µs slew rate, and unity-gain stability. The device operates from 2.3 V to 5.5 V single supply and is specified for automotive-grade temperature range (–40°C to 125°C), making it suitable for harsh-environment sensor front-ends where power efficiency and input voltage headroom are critical.
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 |
| Quiescent current per amplifier | 585 µA typical at 25°C - allows continuous operation for >1 year on a single CR2032 coin cell in sleep-wake sensor nodes |
| Input offset voltage | 5 mV maximum - sets baseline DC error floor for 12-bit ADC interfacing without trimming |
| Rail-to-rail input range | (V−) −0.2 V to (V+) + 0.2 V - accepts signals beyond supply rails, simplifying level-shifting in multi-supply systems |
| Output voltage swing | Within 25 mV of rails (100 kΩ load, TA = 125°C) - preserves dynamic range in low-voltage (2.3 V) battery-powered designs |
| Shutdown current | <1 µA - reduces system standby power by >99.8% versus active mode, critical for IoT endpoint duty cycling |
| Common-mode rejection ratio | 70 dB minimum (–40°C to 125°C) - ensures robustness against supply noise in noisy industrial environments |
Pinout & Package
OPA373AIDR is supplied in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with exposed thermal pad not present. Pin 1 is marked by a beveled corner or dot; orientation follows standard JEDEC SOIC top-view convention.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Enable | Active-high digital control: drives amplifier into <1 µA shutdown when logic low (≤0.8 V); requires no external pull-up |
| 2 | –IN | Inverting input node - accepts common-mode voltages down to (V−) −0.2 V, enabling true single-supply transimpedance configurations |
| 3 | +IN | Noninverting input node - complements –IN with identical rail-to-rail common-mode range and 10 pA max input bias current |
| 4 | V− | Negative supply terminal - must be connected to ground or lowest system potential; not internally tied to substrate |
| 5 | NC | No internal connection - electrically isolated; may be left floating or grounded for mechanical stability |
| 6 | OUT | Amplifier output - capable of sourcing/sinking ±20 mA short-circuit current; stable driving 250 pF capacitive loads at unity gain |
| 7 | V+ | Positive supply terminal - supports 2.3 V–5.5 V operation; decoupling capacitor (0.1 µF) required within 5 mm |
| 8 | NC | No internal connection - electrically isolated; no routing or thermal relief needed |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in 2.3 V–3.3 V systems without level-shifting circuitry or supply boosting |
| Shutdown mode with <1 µA IQ | Permits microcontroller-driven power gating in battery-constrained devices, reducing average system current by orders of magnitude |
| 6.5-MHz GBW at 585 µA | Delivers high-speed performance per unit power-ideal for anti-aliasing filters ahead of 1 MSPS SAR ADCs in portable instrumentation |
| Specified from –40°C to 125°C | Validates operation in automotive engine compartments, industrial PLC I/O modules, and outdoor environmental sensors |
| Low 10 pA input bias current | Minimizes voltage error in high-impedance sensor interfaces (e.g., pH electrodes, photodiode TIA feedback networks) |
Applications
| Portable ECG Monitor Front-End | Battery-Powered Gas Sensor Signal Chain |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in a handheld ECG device powered by a 3.0 V Li-ion cell. IC Role / Device Role / Timing Role: Primary instrumentation amplifier gain stage with programmable gain and shutdown control synchronized to measurement bursts. Use Value: Rail-to-rail input accepts electrode offsets up to ±300 mV; 585 µA IQ extends battery life to >72 hours continuous operation; 6.5 MHz GBW supports 100 Hz high-pass filtering without phase lag. |
Use Scenario: Conditioning output from a metal-oxide semiconductor (MOS) gas sensor whose resistance varies from 1 kΩ to 100 kΩ across target gas concentrations. IC Role / Device Role / Timing Role: Transconductance amplifier converting sensor resistance changes into precise voltage outputs for 12-bit ADC sampling. Use Value: 10 pA IB prevents loading of high-resistance sensor elements; rail-to-rail output maximizes ADC utilization across 2.3–3.6 V battery discharge curve; shutdown cuts idle current during 10-s sampling intervals. |
| Active Filter for Audio DAC Output | Industrial Temperature Transmitter Interface |
Use Scenario: Implementing a 2nd-order low-pass filter between a 24-bit audio DAC and headphone driver in a Bluetooth speaker. IC Role / Device Role / Timing Role: Unity-gain stable Sallen-Key filter stage with adjustable cutoff frequency set by external RC network. Use Value: 6.5 MHz GBW ensures flat frequency response up to 20 kHz; 5 mV VOS avoids audible DC offset in headphones; SOIC-8 footprint allows compact PCB layout near DAC. |
Use Scenario: Isolating and scaling the 4–20 mA loop signal from a RTD-based temperature transmitter before feeding to a PLC analog input module. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with gain calibration and cold-junction compensation support. Use Value: 70 dB CMRR rejects common-mode noise on long industrial cables; 125°C rating matches transmitter housing temperature; NC pins simplify layout routing around sensitive analog traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDR | Zero-drift architecture; 0.02 µV/°C offset drift vs. 3 µV/°C for OPA373AIDR; 350 kHz GBW; no shutdown pin | Required for µV-level DC stability in precision weigh scales; unsuitable where 6.5 MHz bandwidth or shutdown control is mandatory | Select OPA333AIDR only when ultra-low drift dominates over speed and power control needs |
| MCP6001T-I/OT | Lower cost CMOS op amp; 1 MHz GBW; 100 nA IB; no shutdown; SOT-23-5 package | Acceptable for non-critical sensor buffering where 6.5 MHz and 10 pA IB are unnecessary; incompatible pinout and missing enable function | Choose MCP6001T-I/OT only for cost-sensitive, low-bandwidth applications with no thermal or shutdown requirements |
Compared with OPA333AIDR and MCP6001T-I/OT, the OPA373AIDR uniquely balances 6.5 MHz bandwidth, rail-to-rail operation, integrated shutdown, and 10 pA input bias-making it the only option among the three that meets simultaneous requirements for portable, battery-powered, high-fidelity signal acquisition with thermal resilience.
Availability
OPA373AIDR is available at Aetrix Electronics and suitable for portable medical devices, battery-powered environmental sensors, and industrial analog front-ends requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for OPA373AIDR 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 amplifiers and low-power signal chain solutions.
The OPA373 family was designed specifically for portable, battery-powered instrumentation requiring rail-to-rail operation, low quiescent current, and robust performance across –40°C to 125°C-targeting medical, industrial, and consumer sensing applications.
FAQ
What is the absolute maximum supply voltage for OPA373AIDR?
The absolute maximum supply voltage for OPA373AIDR is 7 V, as stated in the Absolute Maximum Ratings table. Exceeding this voltage-even momentarily-can cause permanent damage. The recommended operating range is 2.3 V to 5.5 V, and the device is fully specified across that range. Always include overvoltage protection (e.g., Zener clamp or TVS diode) if system-level transients could breach 7 V.
Does OPA373AIDR support true rail-to-rail input with signals below ground?
Yes, OPA373AIDR supports true rail-to-rail input down to (V−) −0.2 V. When V− is connected to ground, the input common-mode range extends to –0.2 V, allowing slightly negative signals without clamping or phase inversion. This capability is enabled by its complementary N/P-channel input stage and is validated across –40°C to 125°C per the datasheet's VCM specification.
How does the shutdown pin (Pin 1) behave in OPA373AIDR?
Pin 1 of OPA373AIDR is an active-high Enable input. When driven ≥2 V above V− (logic high), the amplifier operates normally. When held ≤0.8 V above V− (logic low), it enters shutdown with total supply current <1 µA. No external pull-up resistor is required-the internal logic threshold is fixed relative to V−, ensuring reliable operation across voltage and temperature.
Can OPA373AIDR drive a 1000-pF capacitive load stably?
No-OPA373AIDR is characterized for stable unity-gain operation with up to ~250 pF capacitive load. Driving 1000 pF directly causes excessive overshoot and potential oscillation due to phase margin degradation. To interface with heavy capacitive loads, add a small isolation resistor (10–20 Ω) between the output and the capacitance, as shown in Figure 23 of the datasheet, or use a higher-gain configuration to improve stability margin.
Is OPA373AIDR pin-compatible with OPA374AIDR?
No-OPA373AIDR and OPA374AIDR are not pin-compatible. While both are offered in SOIC-8 packages, OPA373AIDR includes an Enable pin (Pin 1) and two NC pins (Pins 5 and 8), whereas OPA374AIDR has NC pins at Pins 1, 5, and 8 and no Enable function. Swapping them requires PCB redesign and firmware updates to manage shutdown control, making them functionally distinct despite shared package outline.
OPA373AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
OPA373AIDR FAQ
1.How can I place an order for OPA373AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA373AIDR 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 OPA373AIDR reliable?
The price and inventory of OPA373AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA373AIDR is usually 5 days.
3.What payment methods are accepted for OPA373AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA373AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA373AIDR?
OPA373AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA373AIDR 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 OPA373AIDR?
For technical support, including OPA373AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA373AIDR requirements.
6.How does Aetrix verify that OPA373AIDR is sourced from the original manufacturer or authorized distributors?
All OPA373AIDR 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 OPA373AIDR meets industry standards.
7.What is the process for return or replacement of OPA373AIDR?
All OPA373AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA373AIDR, 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 OPA373AIDR part is unused and in its original packaging.
Return procedure for OPA373AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA373AIDR Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
