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Texas Instruments OPA2379AIDR
- Part No.:
- OPA2379AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2379AIDR.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,516
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Product details
Overview
OPA2379AIDR from Texas Instruments is a dual micropower rail-to-rail input/output operational amplifier designed for ultra-low-power signal conditioning in battery-powered systems. It delivers 90kHz gain-bandwidth, 2.9µA quiescent current per amplifier, 1.5mV max offset voltage, and operates from 1.8V to 5.5V supply - enabling precision sensing in portable gas meters and handheld medical instruments.
For engineers reviewing the OPA2379AIDR datasheet, OPA2379AIDR pinout, OPA2379AIDR application, or OPA2379AIDR equivalent, key selection criteria include its 2.8µVPP (0.1Hz–10Hz) noise floor, ±5pA input bias current, –40°C to +125°C operating range, and SOIC-8 package compatibility with space-constrained PCB layouts.
Technical Context
The OPA2379AIDR uses a complementary input stage to achieve rail-to-rail common-mode input range extending 100mV beyond each supply rail, with CMRR ≥100dB and PSRR ≤10µV/V at 25°C. Its low-noise architecture combines 80nV/√Hz wideband density with 2.8µVPP flicker noise, optimized for DC-coupled sensor interfaces where power and precision coexist.
Stability is maintained up to 30pF capacitive load in unity-gain buffer configurations; overshoot is minimized via internal compensation, and output swing remains within 10mV of rails at 25kΩ load. The device avoids external compensation in most single-supply applications due to its robust phase margin across voltage and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - supports direct connection to single-cell Li-ion (3.0V), alkaline (1.8V), or regulated 3.3V/5V rails without level-shifting. |
| Quiescent Current | 2.9µA per amplifier (typ) - enables >1-year battery life in always-on wearable sensors drawing <10µA system current. |
| Gain-Bandwidth Product | 90kHz - sufficient for DC–10kHz physiological signals (ECG, pulse oximetry) and slow industrial transducer outputs. |
| Input Offset Voltage | 1.5mV (max) - ensures ≤0.03% full-scale error in 50mV-range thermopile or strain gauge amplification. |
| Input Bias Current | ±5pA (typ) - prevents significant voltage drop across >10MΩ source impedances (e.g., pH electrodes, piezoresistive sensors). |
| Output Swing | Within 10mV of rails (RL = 25kΩ) - maximizes dynamic range in 1.8V-supplied ADC front-ends with no headroom loss. |
| Operating Temperature | –40°C to +125°C - qualified for automotive cabin modules, industrial field transmitters, and outdoor medical devices. |
Pinout & Package
OPA2379AIDR is housed in an 8-pin SOIC (D) package with standard 1.27mm pitch, 3.9mm × 4.9mm body, and RoHS-compliant NiPdAu lead finish. Thermal resistance θJA is 150°C/W, supporting operation at full spec under natural convection.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input B (IN–B) | High-impedance node for differential feedback networks; accepts rail-to-rail common-mode voltages from V– – 0.1V to V+ + 0.1V. |
| 2 | Non-inverting Input B (IN+B) | Direct connection point for reference voltage or sensor high-side signal; immune to ESD diode clamping distortion below rail limits. |
| 3 | Output B (OUTB) | Capable of sourcing/sinking ±5mA; drives 25kΩ loads to within 10mV of supply rails; stable with ≤30pF capacitive loads. |
| 4 | Ground / Negative Supply (V–) | Return path for both amplifiers; must be low-impedance to minimize PSRR degradation and ground-loop errors in dual-supply use. |
| 5 | Non-inverting Input A (IN+A) | Independent input for first amplifier channel; shares same DC precision specs (1.5mV VOS, 100dB CMRR) as Pin 2. |
| 6 | Inverting Input A (IN–A) | Feedback node for Channel A; compatible with resistor networks up to 10MΩ without significant bias-current-induced offset. |
| 7 | Output A (OUTA) | Matched performance to OUTB: identical slew rate (0.03V/µs), overload recovery (25µs), and short-circuit protection. |
| 8 | Positive Supply (V+) | Accepts 1.8V–5.5V; bypass capacitor (0.1µF ceramic) required adjacent to pin for PSRR optimization and noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full utilization of 1.8V supply in single-ended ADC interfaces - eliminates need for level-shifting or negative bias rails. |
| 2.8µVPP 0.1Hz–10Hz noise | Reduces baseline drift in DC-coupled biosensors (e.g., ECG front-ends), avoiding post-acquisition digital filtering overhead. |
| 5pA input bias current | Permits direct interfacing with high-impedance sources like photodiodes, electret mics, and electrochemical cells without guard traces. |
| 100dB CMRR & PSRR | Maintains accuracy in noisy environments (e.g., motor-driven portable tools) by rejecting supply ripple and common-mode interference. |
| –40°C to +125°C operation | Supports deployment in under-hood automotive sensors and industrial process controllers without derating or thermal management. |
Applications
| Portable Gas Meter | Battery-Powered ECG Monitor |
|---|---|
Use Scenario: Amplifying low-level analog output from electrochemical CO sensor with 100mV full-scale range and 100MΩ source impedance. IC Role / Device Role / Timing Role: Dual-channel signal conditioner: Channel A buffers reference voltage; Channel B amplifies sensor current via transimpedance configuration. Use Value: 5pA bias current prevents >5mV offset error; 2.8µVPP noise ensures sub-ppm resolution over 10-second integration window. |
Use Scenario: Front-end amplification of 1mV–5mV differential ECG signals in wrist-worn patch monitor powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Instrumentation-grade dual op-amp implementing 100x gain, high-pass filtering, and rail-to-rail output drive into 12-bit SAR ADC. Use Value: 2.9µA per amplifier extends battery life to 18 months; 1.5mV VOS allows calibration-free operation across temperature. |
| Handheld Insulation Tester | Low-Power Industrial Transmitter |
Use Scenario: Precision voltage reference buffer and high-voltage sense amplifier in 500V insulation resistance tester using switched-capacitor topology. IC Role / Device Role / Timing Role: Reference stabilizer (Channel A) and isolated feedback amplifier (Channel B) operating from 3.3V LDO derived from boost converter. Use Value: 100dB PSRR rejects switching noise from 1MHz boost regulator; rail-to-rail output ensures full ADC code usage despite 3.3V supply. |
Use Scenario: 4–20mA loop transmitter conditioning thermocouple output in hazardous-area field device with intrinsic safety barrier. IC Role / Device Role / Timing Role: Cold-junction compensation amplifier and loop-driver interface stage, operating from 3.6V primary cell with energy harvesting backup. Use Value: 125°C rating permits enclosure mounting near hot pipelines; 5.5µA max IQ meets SIL-2 functional safety current budget constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2242IDR | Higher 0.6mV max VOS but wider 2.5V–12V supply range; 5.5kHz GBW vs 90kHz. | Better for higher-voltage industrial sensors (>5V); unsuitable for sub-2V battery operation or bandwidth-critical designs. | Select TLV2242IDR only when supply exceeds 5.5V or VOS tolerance <0.6mV is mandatory - not a drop-in replacement. |
| OPA2347UA | 20µA IQ (vs 2.9µA), 350kHz GBW, 2.3V–5.5V range; 2mV max VOS. | Higher speed suits active filters or faster sensor sampling; 7× higher IQ reduces battery life in always-on devices. | Choose OPA2347UA when bandwidth >100kHz is required and power budget allows ≥20µA per channel. |
Compared with TLV2242IDR and OPA2347UA, the OPA2379AIDR uniquely balances ultra-low IQ (2.9µA), rail-to-rail I/O at 1.8V, and 90kHz bandwidth - making it optimal for long-life, low-voltage, precision-sensing nodes where every nanoamp counts.
Availability
OPA2379AIDR is available at Aetrix Electronics and suitable for portable medical devices, handheld test equipment, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for OPA2379AIDR 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 OPA2379AIDR belongs to TI's OPAx379 micropower op-amp family, engineered specifically for battery-operated instrumentation where nanoscale power efficiency must not compromise DC accuracy or noise performance.
FAQ
What is the maximum capacitive load the OPA2379AIDR can drive stably in unity-gain buffer configuration?
The OPA2379AIDR maintains stability with up to 30pF capacitive load in unity-gain buffer mode, as verified in Figure 17 of the SBOS347D datasheet. Exceeding this value may cause overshoot or ringing; for larger loads, insert a 10Ω–20Ω series resistor between output and capacitance to restore phase margin without degrading DC accuracy.
Does the OPA2379AIDR support true rail-to-rail input common-mode range?
Yes, the OPA2379AIDR achieves rail-to-rail input operation: its common-mode voltage range extends from (V–) – 0.1V to (V+) + 0.1V, confirmed in the Electrical Characteristics table. However, CMRR degrades above (V+) – 1V due to input stage transition - keep inputs within (V–) to (V+) – 1V for full 100dB rejection.
Can the OPA2379AIDR operate from a 1.8V single supply while driving a 25kΩ load?
Yes, the OPA2379AIDR is fully specified at 1.8V supply and delivers rail-to-rail output swing within 10mV of both rails into 25kΩ, per the "Voltage Output Swing from Rail" specification. This enables direct interfacing with 1.8V ADCs without level-shifting circuitry or supply boosting.
What is the typical input bias current of the OPA2379AIDR at 25°C and how does it affect high-impedance sensor interfaces?
The OPA2379AIDR exhibits ±5pA typical input bias current at 25°C, with ±50pA maximum over temperature. When interfacing with >10MΩ sources (e.g., pH probes or photodiodes), this introduces <0.05mV offset error - negligible compared to its 1.5mV max VOS, preserving measurement integrity without guard-ring layout.
Is the OPA2379AIDR pin-compatible with other dual op-amps in SOIC-8 package such as the LM358?
No, the OPA2379AIDR is not pin-compatible with LM358 or other legacy dual op-amps. Its SOIC-8 pinout (IN–B, IN+B, OUTB, V–, IN+A, IN–A, OUTA, V+) differs fundamentally from LM358's (IN–A, IN+A, OUTA, V–, IN–B, IN+B, OUTB, V+). PCB redesign is required for migration.
OPA2379AIDR 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:
- 2
- 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 (x2 Channels)
- 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
OPA2379AIDR FAQ
1.How can I place an order for OPA2379AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2379AIDR 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 OPA2379AIDR reliable?
The price and inventory of OPA2379AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2379AIDR is usually 5 days.
3.What payment methods are accepted for OPA2379AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2379AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2379AIDR?
OPA2379AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2379AIDR 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 OPA2379AIDR?
For technical support, including OPA2379AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2379AIDR requirements.
6.How does Aetrix verify that OPA2379AIDR is sourced from the original manufacturer or authorized distributors?
All OPA2379AIDR 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 OPA2379AIDR meets industry standards.
7.What is the process for return or replacement of OPA2379AIDR?
All OPA2379AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2379AIDR, 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 OPA2379AIDR part is unused and in its original packaging.
Return procedure for OPA2379AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2379AIDR Tags
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