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Texas Instruments OPA379AIDR
- Part No.:
- OPA379AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA379AIDR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,733
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Product details
Overview
OPA379AIDR from Texas Instruments is a single-channel, rail-to-rail input/output micropower operational amplifier optimized for ultra-low-power battery-operated systems. It delivers 90kHz gain-bandwidth, 2.9µA quiescent current, 1.5mV max offset voltage, and operates from 1.8V to 5.5V supply - enabling precision signal conditioning in portable gas meters and handheld medical sensors.
For engineers reviewing the OPA379AIDR datasheet, OPA379AIDR pinout, OPA379AIDR application, or OPA379AIDR equivalent, key selection criteria include its 2.8µVPP (0.1Hz–10Hz) noise performance, 5pA input bias current, rail-to-rail I/O swing within 10mV of rails (RL = 25kΩ), and guaranteed operation across –40°C to +125°C industrial temperature range.
Technical Context
The OPA379AIDR employs a complementary differential input stage to achieve rail-to-rail common-mode input range extending 100mV beyond both supply rails, with CMRR ≥100dB at 25°C. Its low-noise, low-drift architecture supports DC-precision applications despite sub-3µA quiescent current.
It features unity-gain stable operation with capacitive load drive up to 30pF, and includes internal ESD protection (HBM: 2000V, CDM: 1000V). The device is fully specified over 1.8V–5.5V supply and supports single-supply configurations without external level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct interface with Li-ion, coin-cell, and 3.3V/5V logic rails without regulators. |
| Quiescent Current | 2.9µA (typ), 5.5µA (max) - extends battery life in always-on sensor front-ends and wearable monitors. |
| Gain-Bandwidth Product | 90kHz - sufficient for DC-coupled biosignal amplification, battery voltage monitoring, and slow analog sensor interfaces. |
| Input Offset Voltage | 1.5mV (max) - ensures <±1LSB error in 12-bit ADC systems with 3V full-scale reference. |
| Input Bias Current | ±5pA (typ) - minimizes voltage error in high-impedance pH, thermopile, or photodiode transimpedance circuits. |
| Output Swing (RL=25kΩ) | Within 10mV of rails - preserves dynamic range in single-supply data acquisition with rail-referenced references. |
| 0.1Hz–10Hz Noise | 2.8µVPP - critical for low-frequency medical instrumentation (ECG, EEG) where 1/f noise dominates. |
Pinout & Package
OPA379AIDR is housed in an 8-pin SOIC (D) package with standard JEDEC outline, 1.27mm pitch, and 5.0mm × 6.2mm footprint. Thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pad; must be left floating or grounded per layout best practice - no functional impact. |
| 2 (V−) | Negative supply rail | Ground reference for single-supply operation; accepts 0V or negative voltage down to –0.5V relative to V+. |
| 3 (+IN) | Inverting input | Differential input node; rail-to-rail common-mode range supports direct sensing of signals near supply rails. |
| 4 (OUT) | Amplifier output | Capable of sourcing/sinking ±5mA; drives 25kΩ loads to within 10mV of V+ or V−. |
| 5 (−IN) | Non-inverting input | High-impedance input (1013Ω||6pF); enables precision buffer and instrumentation amplifier topologies. |
| 6 (V+) | Positive supply rail | Accepts 1.8V–5.5V; PSRR = 2µV/V ensures immunity to supply ripple in noisy embedded systems. |
| 7 (NC) | No internal connection | Unused pad; electrically isolated - no routing or thermal tie required. |
| 8 (NC) | No internal connection | Unused pad; not bonded - leave unconnected per TI package documentation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full utilization of supply voltage headroom in single-supply systems - eliminates need for dual supplies or level shifters. |
| 2.9µA quiescent current | Reduces average power to <16µW at 5.5V - suitable for multi-year battery life in wireless sensor nodes. |
| 5pA input bias current | Minimizes offset error in high-Z sensor interfaces (e.g., electrochemical gas sensors, piezoresistive bridges). |
| 2.8µVPP 0.1Hz–10Hz noise | Supports accurate DC and low-frequency measurements in clinical-grade portable diagnostics. |
| –40°C to +125°C operation | Validated for automotive cabin modules, industrial field transmitters, and outdoor IoT edge devices. |
Applications
| Battery Voltage Monitoring | Portable Gas Detection |
|---|---|
Use Scenario: Real-time measurement of lithium coin-cell or alkaline battery voltage in handheld test equipment. IC Role / Device Role / Timing Role: Precision unity-gain buffer and comparator front-end, referenced to low-power voltage reference (e.g., REF3312). Use Value: 1.5mV max offset ensures ≤0.5% error at 3V battery level; 2.9µA IQ prevents self-discharge during standby. | Use Scenario: Signal conditioning for electrochemical gas sensor output in personal safety monitors. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier converting picoamp-level sensor current to measurable voltage. Use Value: 5pA input bias avoids loading high-impedance sensor electrodes; 2.8µVPP noise preserves resolution of sub-ppm gas concentration readings. |
| Handheld Medical Sensors | Low-Power Data Acquisition |
Use Scenario: Front-end amplification for skin-contact biopotential sensors (e.g., pulse oximetry, EMG) in battery-powered wearables. IC Role / Device Role / Timing Role: Rail-to-rail input instrumentation amplifier stage rejecting common-mode motion artifacts. Use Value: 100dB CMRR suppresses 50/60Hz interference; rail-to-rail input accommodates electrode offsets up to ±0.3V without clipping. | Use Scenario: Analog signal conditioning for 16-bit ADCs in energy-harvesting environmental sensor nodes. IC Role / Device Role / Timing Role: Programmable-gain amplifier (PGA) driver with selectable gain and low-noise buffering. Use Value: 90kHz GBW supports settling in <10µs for 100ksps sampling; 80nV/√Hz wideband noise maintains SNR >85dB. |
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 IQ (7µA), lower GBW (5.5kHz), 0.6mV VOS - less bandwidth but better DC precision. | Better suited for ultra-low-frequency DC amplification (e.g., strain gauge bridges) where speed is secondary. | Select TLV2241IDBVR when offset drift (<0.5µV/°C) and long-term stability outweigh bandwidth needs. |
| OPA347UA | Higher IQ (20µA), higher GBW (350kHz), 2mV VOS - trades power for speed and drive capability. | Preferred for driving capacitive loads >100pF or interfacing with fast SAR ADCs requiring faster settling. | Choose OPA347UA when system requires >200kHz closed-loop bandwidth or >10mA output drive. |
Compared with TLV2241IDBVR and OPA347UA, the OPA379AIDR uniquely balances sub-3µA quiescent current, 90kHz bandwidth, and rail-to-rail I/O - making it optimal for battery-constrained applications needing both precision and moderate speed.
Availability
OPA379AIDR is available at Aetrix Electronics and suitable for battery voltage monitoring, portable gas detection, and handheld medical sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA379AIDR 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 chains.
The OPA379 family was designed specifically for micropower, rail-to-rail precision amplification in battery-powered instrumentation - targeting portable medical devices, handheld test gear, and industrial sensor nodes operating from 1.8V supplies.
FAQ
What is the maximum operating temperature range for the OPA379AIDR?
The OPA379AIDR is fully specified and tested from –40°C to +125°C. This extended industrial temperature range is validated across all key parameters including offset voltage, CMRR, and quiescent current - ensuring reliable operation in automotive cabin modules, outdoor IoT sensors, and industrial field transmitters where ambient temperatures exceed standard commercial limits.
Does the OPA379AIDR support true rail-to-rail input and output operation?
Yes, the OPA379AIDR supports rail-to-rail input common-mode range extending 100mV beyond both supply rails (V− – 0.1V to V+ + 0.1V) and rail-to-rail output swing within 10mV of each rail under 25kΩ load. This allows direct interfacing with single-supply references and maximizes dynamic range without external level-shifting circuitry - a key advantage over legacy micropower op amps.
Can the OPA379AIDR drive capacitive loads, and what is the recommended approach?
The OPA379AIDR is stable with capacitive loads up to 30pF in unity-gain configuration. For larger loads, TI recommends adding a 10Ω–20Ω series resistor (RS) between the output and load to reduce ringing while preserving DC accuracy. This technique is validated in Figure 21 of the SBOS347D datasheet and maintains output swing integrity without requiring feedback capacitor compensation.
What is the typical input bias current of the OPA379AIDR, and why does it matter in sensor applications?
The OPA379AIDR has a typical input bias current of ±5pA. This ultra-low value prevents loading errors in high-impedance sensor interfaces such as electrochemical gas sensors (100MΩ–1GΩ output impedance), thermopiles, and pH electrodes - where even 100pA bias current would introduce significant offset and drift. Its 5pA spec enables accurate transimpedance gain without calibration overhead.
Is the OPA379AIDR pin-compatible with other members of the OPA379 family, such as the OPA2379 or OPA4379?
No, the OPA379AIDR (SOIC-8) is not pin-compatible with the OPA2379 (also SOIC-8 but dual-channel) or OPA4379 (TSSOP-14, quad-channel). While all share identical electrical specifications and pin function definitions per channel, the OPA379AIDR's SOIC-8 package contains only one amplifier with NC pins at positions 1, 7, and 8 - unlike the OPA2379 which uses those pins for second amplifier I/O. Board redesign is required for substitution.
OPA379AIDR 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:
- 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
OPA379AIDR FAQ
1.How can I place an order for OPA379AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA379AIDR 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 OPA379AIDR reliable?
The price and inventory of OPA379AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA379AIDR is usually 5 days.
3.What payment methods are accepted for OPA379AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA379AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA379AIDR?
OPA379AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA379AIDR 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 OPA379AIDR?
For technical support, including OPA379AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA379AIDR requirements.
6.How does Aetrix verify that OPA379AIDR is sourced from the original manufacturer or authorized distributors?
All OPA379AIDR 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 OPA379AIDR meets industry standards.
7.What is the process for return or replacement of OPA379AIDR?
All OPA379AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA379AIDR, 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 OPA379AIDR part is unused and in its original packaging.
Return procedure for OPA379AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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