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Texas Instruments OPA379AID
- Part No.:
- OPA379AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA379AID.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:476
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Product details
Overview
OPA379AID from Texas Instruments is a single, rail-to-rail input/output micropower operational amplifier optimized for ultra-low-power, battery-powered systems. It delivers 90kHz gain-bandwidth, 2.9µA quiescent current (typ), 1.5mV max offset voltage, and 2.8µVPP (0.1Hz–10Hz) noise - enabling precision signal conditioning in portable medical sensors and handheld test equipment.
For engineers reviewing the OPA379AID datasheet, OPA379AID pinout, OPA379AID application, or OPA379AID equivalent, key selection criteria include its 1.8V to 5.5V supply range, –40°C to +125°C operating temperature, SOIC-8 package compatibility, and verified rail-to-rail I/O performance under microamp-level bias conditions.
Technical Context
The OPA379AID employs a complementary input stage enabling rail-to-rail common-mode input range (V– – 0.1V to V+ + 0.1V) and achieves 100dB CMRR and PSRR at DC. Its low-noise architecture combines 80nV/√Hz wideband density with 2.8µVPP flicker noise, while maintaining 120dB open-loop gain (AOL) and 0.03V/µs slew rate.
Designed for stability with capacitive loads up to 30pF, it supports unity-gain buffer configurations with optional 10Ω–20Ω series output resistance. Input bias current remains ≤50pA over temperature, and output swing reaches within 10mV of rails (RL = 25kΩ), ensuring high dynamic range in single-supply sensor front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct operation from single Li-ion, coin-cell, or regulated 3.3V/5V rails without LDO overhead. |
| Quiescent Current | 2.9µA (typ) at 5.5V - allows >1-year battery life in always-on wearable sensors drawing <10µA system current. |
| Gain-Bandwidth Product | 90kHz - sufficient for ECG amplification, thermistor linearization, and slow-scan ADC driving at ≤10ksps. |
| Input Offset Voltage | 1.5mV (max) - ensures ≤0.03% full-scale error in 50mV-range bridge sensor outputs without trimming. |
| Input Voltage Noise | 2.8µVPP (0.1Hz–10Hz) - preserves signal integrity in low-frequency biomedical measurements like pulse oximetry. |
| Output Swing | Within 10mV of rails (RL = 25kΩ) - maximizes usable dynamic range in 1.8V-supplied data acquisition systems. |
| Operating Temperature | –40°C to +125°C - qualified for industrial monitoring nodes and automotive cabin-sensor interfaces. |
Pinout & Package
OPA379AID is packaged in an 8-pin SOIC (D) body with standard JEDEC outline, 1.27mm pitch, and 5.0mm × 6.2mm footprint. Thermal resistance θJA = 150°C/W supports operation at full spec without heatsinking.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–IN) | Differential input node; accepts signals down to V– – 0.1V with 5pA bias current. |
| 2 | Non-Inverting Input (+IN) | Differential input node; rail-to-rail common-mode range supports single-supply biasing at mid-rail. |
| 3 | Output (OUT) | Capable of sourcing/sinking ±5mA; swings within 10mV of rails into 25kΩ load. |
| 4 | Ground / Negative Supply (V–) | Reference for dual-supply operation or ground return in single-supply configurations. |
| 5 | NC | No internal connection - left unconnected per TI datasheet; no routing required. |
| 6 | NC | No internal connection - left unconnected per TI datasheet; no routing required. |
| 7 | Positive Supply (V+) | Accepts 1.8V–5.5V; bypass capacitor (0.1µF) required adjacent to pin for PSRR optimization. |
| 8 | NC | No internal connection - left unconnected per TI datasheet; no routing required. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail I/O | Enables full utilization of 1.8V supply headroom - eliminates level-shifting circuitry in low-voltage sensor interfaces. |
| 2.9µA Quiescent Current | Reduces battery drain by >5× vs comparable precision op amps - critical for multi-year IoT endpoint deployments. |
| 2.8µVPP Low-Frequency Noise | Minimizes baseline wander in DC-coupled physiological amplifiers - meets AAMI EC11 requirements for ECG front-ends. |
| 100dB PSRR & CMRR | Rejects supply ripple and common-mode interference in noisy industrial environments without external filtering. |
| –40°C to +125°C Operation | Validated performance across automotive under-hood and industrial control cabinet temperature extremes. |
Applications
| Battery-Powered Medical Sensors | Portable Gas Detection |
|---|---|
Use Scenario: Amplifying microvolt-level signals from electrochemical gas sensors in handheld analyzers powered by CR2032 cells. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting sensor current to stable voltage output with rail-to-rail swing. Use Value: 2.9µA IQ extends battery life beyond 2 years; 90kHz GBW supports fast response to gas concentration changes. |
Use Scenario: Signal conditioning for catalytic bead or NDIR sensors in intrinsically safe portable gas meters. IC Role / Device Role / Timing Role: Low-drift, low-noise buffer isolating sensor output from ADC input while rejecting PCB thermal gradients. Use Value: 1.5mV max VOS prevents calibration drift; 100dB PSRR suppresses switching regulator noise in compact enclosures. |
| Handheld Test Equipment | Low-Power Data Loggers |
Use Scenario: Front-end amplifier in pocket-sized multimeters measuring µA currents and mV thermocouple outputs. IC Role / Device Role / Timing Role: Programmable-gain amplifier with rail-to-rail input enabling auto-ranging across 100nA–10mA scales. Use Value: 5pA input bias avoids loading high-impedance probe circuits; SC70/SOT23 variants support miniaturized PCB layouts. |
Use Scenario: Sensor interface in solar-powered environmental monitors logging temperature, humidity, and CO₂ hourly for 5+ years. IC Role / Device Role / Timing Role: Always-on signal conditioner powering up only during ADC sampling bursts to minimize average current. Use Value: Sub-3µA IQ enables >99% duty-cycled operation; 125°C rating supports outdoor deployment in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2241IDBVR | Higher 0.6mV VOS (max), 5.5kHz GBW, 2.5V–12V supply - less bandwidth and higher offset than OPA379AID. | Targeted at general-purpose low-voltage apps where 90kHz is unnecessary; not specified below 2.5V. | Select TLV2241IDBVR only if supply ≥2.5V and bandwidth <10kHz suffices - avoid for sub-2V battery systems. |
| OPA347UA | 20µA IQ (5× higher), 350kHz GBW, 2.3V–5.5V supply - trades power for speed and wider VS range. | Better suited for active filters or faster sensor interfaces where 2.9µA is not mandatory. | Choose OPA347UA when system requires >30kHz closed-loop bandwidth and can tolerate ~20µA supply current. |
Compared with TLV2241IDBVR and OPA347UA, the OPA379AID uniquely balances ultra-low quiescent current (2.9µA), 90kHz bandwidth, and 1.8V operation - making it the only option among the three qualified for long-life, sub-2V, precision analog front-ends.
Availability
OPA379AID is available at Aetrix Electronics and suitable for battery-powered medical sensors, portable gas detection, and handheld test equipment requiring stable component supply across extended product lifecycles.
Supply support for OPA379AID 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 design.
The OPA379 family was engineered specifically for micropower, rail-to-rail signal conditioning in battery-constrained applications - emphasizing ultra-low IQ, low-noise performance, and robust operation from 1.8V.
FAQ
What is the maximum supply voltage for OPA379AID?
The absolute maximum supply voltage for OPA379AID is +7V, but its specified operating range is 1.8V to 5.5V. Operating above 5.5V voids parametric guarantees and risks reliability degradation. For designs using 5V rails, OPA379AID maintains full specification compliance including 2.9µA IQ and 90kHz GBW - confirming its suitability for standard 5V logic-compatible systems.
Does OPA379AID support true rail-to-rail input and output?
Yes, OPA379AID supports rail-to-rail input (VCM = V– – 0.1V to V+ + 0.1V) and rail-to-rail output (swing within 10mV of rails with 25kΩ load). This is confirmed in the Electrical Characteristics table and Typical Characteristics plots. The complementary input stage enables full input range utilization, while the output stage delivers near-zero headroom loss - critical for maximizing dynamic range in 1.8V–3.3V systems.
What is the input bias current specification for OPA379AID?
OPA379AID has a maximum input bias current of ±50pA over –40°C to +125°C, with typical value ±5pA at +25°C. This ultra-low bias enables high-impedance sensor interfacing (e.g., pH electrodes, piezoresistive bridges) without significant voltage error. The specification is validated across temperature and supply voltage per the TI SBOS347D datasheet, Table 1.
Can OPA379AID drive capacitive loads?
OPA379AID is stable with capacitive loads up to 30pF in unity-gain configuration. For larger loads, TI recommends adding a 10Ω–20Ω series resistor between output and load (Figure 21). This preserves DC accuracy while eliminating ringing - verified in Typical Characteristics (Figure 17). Do not exceed 30pF without isolation resistance, as overshoot increases significantly beyond this point.
Is OPA379AID RoHS compliant and lead-free?
Yes, OPA379AID is RoHS compliant and features NiPdAu (NIPDAU) lead finish per the TI Package Option Addendum. Its MSL rating is Level-2-260°C-1 Year, and it ships in tape-and-reel (2500 pcs) or tube (75 pcs) packaging. Full compliance documentation, including material declarations and reflow profiles, is available on ti.com under OPA379AID product folder.
OPA379AID 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:
- 0.03V/µs
- Gain Bandwidth Product:
- 90 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 2.9µA
- Current - Output / Channel:
- 5 mA
- Voltage - Supply Span (Min):
- 1.8 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
OPA379AID FAQ
1.How can I place an order for OPA379AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA379AID 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 OPA379AID reliable?
The price and inventory of OPA379AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA379AID is usually 5 days.
3.What payment methods are accepted for OPA379AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA379AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA379AID?
OPA379AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA379AID 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 OPA379AID?
For technical support, including OPA379AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA379AID requirements.
6.How does Aetrix verify that OPA379AID is sourced from the original manufacturer or authorized distributors?
All OPA379AID 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 OPA379AID meets industry standards.
7.What is the process for return or replacement of OPA379AID?
All OPA379AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA379AID, 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 OPA379AID part is unused and in its original packaging.
Return procedure for OPA379AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA379AID Tags
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