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Texas Instruments OPA379AIDRG4
- Part No.:
- OPA379AIDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA379AIDRG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,024
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Product details
Overview
OPA379AIDRG4 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 2.8µVPP (0.1Hz–10Hz) noise - enabling precision signal conditioning in portable medical sensors and handheld test equipment.
For engineers reviewing the OPA379AIDRG4 datasheet, OPA379AIDRG4 pinout, OPA379AIDRG4 application, or OPA379AIDRG4 equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for low-voltage (1.8V–5.5V), high-precision, microamp-level analog front-ends.
Technical Context
The OPA379AIDRG4 employs a complementary input stage to achieve rail-to-rail common-mode input range (V– – 0.1V to V+ + 0.1V) and rail-to-rail output swing (≤10mV from rails at 25kΩ load). Its 120dB open-loop gain and 100dB CMRR support high-accuracy DC-coupled amplification in single-supply configurations.
Designed for stability with capacitive loads up to 30pF, it features internal compensation and supports unity-gain operation. The device operates across –40°C to +125°C and maintains 5.5µA max quiescent current over full temperature range - critical for long-life battery applications where power budget is constrained to sub-µA standby modes.
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 energy-harvesting sources without LDO overhead. |
| Quiescent Current | 2.9µA typical (5.5µA max) - allows >1-year runtime on a CR2032 in always-on sensor nodes. |
| Gain Bandwidth Product | 90kHz - sufficient for ECG, pulse oximetry, and gas sensor signal bandwidths while preserving micropower operation. |
| Input Offset Voltage | 1.5mV max - ensures ≤0.3% error in 0.5V full-scale biomedical sensor outputs without trimming. |
| Input Voltage Noise | 2.8µVPP (0.1Hz–10Hz) - supports low-frequency bio-potential measurements with minimal baseline drift. |
| CMRR | 100dB (typical) - rejects supply ripple and common-mode interference in unshielded portable enclosures. |
| Output Swing | Within 10mV of rails (RL = 25kΩ) - maximizes dynamic range in 1.8V/3.3V ADC interfaces. |
Pinout & Package
OPA379AIDRG4 is packaged in an 8-pin SOIC (D) with standard JEDEC outline and moisture sensitivity level 2 (260°C peak reflow). Thermal resistance θJA = 150°C/W supports operation at full ambient range without derating.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–IN) | High-impedance node accepting differential feedback; clamped ±0.5V beyond rails for ESD protection. |
| 2 | Non-Inverting Input (+IN) | Rail-to-rail input capable of operating down to V– – 0.1V; bias current ≤50pA minimizes resistor-induced errors. |
| 3 | Output (OUT) | Capable of driving 25kΩ load within 10mV of supply rails; short-circuit protected to ±5mA. |
| 4 | Ground / Negative Supply (V–) | Reference return for single-supply operation; must be low-impedance to maintain PSRR >100dB. |
| 5 | NC | No internal connection - left unconnected per TI design; not used for thermal pad or biasing. |
| 6 | NC | No internal connection - electrically isolated; no routing or grounding required. |
| 7 | Positive Supply (V+) | Accepts 1.8V–5.5V; requires 0.1µF ceramic bypass capacitor placed <2mm from pin for stable PSRR performance. |
| 8 | NC | No internal connection - unused pin; no electrical or thermal function in SOIC-8 variant. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full utilization of 1.8V supply headroom - eliminates need for level-shifting in low-voltage ADC drivers. |
| 2.9µA quiescent current | Reduces battery drain by >5× vs comparable 100kHz op amps - extends shelf life of disposable diagnostic devices. |
| 2.8µVPP 0.1Hz–10Hz noise | Supports sub-µV bio-signal amplification without external filtering - lowers BOM cost vs multi-stage designs. |
| 1.5mV max offset voltage | Permits DC-coupled sensor interfacing (e.g., thermopile, strain gauge) without factory calibration in cost-sensitive OEMs. |
| –40°C to +125°C operation | Validated for automotive cabin modules and industrial handheld tools exposed to wide ambient extremes. |
Applications
| Battery-Powered Instrumentation | Portable Medical Sensors |
|---|---|
Use Scenario: Precision voltage monitoring of lithium-thionyl chloride primary cells in remote environmental loggers. IC Role / Device Role / Timing Role: Single-supply buffer and level-shifter for 12-bit SAR ADC input, rejecting supply ripple during RF transmission bursts. Use Value: 2.9µA IQ enables >5-year battery life; rail-to-rail output ensures full 0–1.8V ADC code utilization without gain loss. |
Use Scenario: Amplifying low-amplitude ECG signals from dry-electrode patches in wearable heart-rate monitors. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier gain block with DC-coupled input and 90kHz bandwidth. Use Value: 2.8µVPP noise preserves P-wave morphology; 1.5mV VOS avoids baseline wander correction firmware overhead. |
| Handheld Test Equipment | Low-Power Gas Detection |
Use Scenario: Signal conditioning for MEMS-based accelerometers in portable vibration analyzers powered by rechargeable LiPo. IC Role / Device Role / Timing Role: Anti-aliasing filter driver and ADC interface with programmable gain via external resistors. Use Value: 90kHz GBW supports 20kHz measurement bandwidth; 150°C/W θJA prevents thermal shutdown during extended field use. |
Use Scenario: Transimpedance amplifier for electrochemical CO sensor output in personal safety meters. IC Role / Device Role / Timing Role: Low-bias-current (5pA typ) current-to-voltage converter with rail-to-rail output swing. Use Value: 5pA IB minimizes sensor polarization error; 1.8V operation matches ultra-low-power MCU sleep states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower, rail-to-rail operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2241IDBVR | Higher 0.6mV VOS (vs 1.5mV max), 5.5kHz GBW (vs 90kHz), 1µA IQ - trades bandwidth for lower offset. | Better for DC-stable pH sensors; unsuitable for AC-coupled bio-signals requiring >10kHz response. | Select when ultra-low offset dominates over bandwidth; verify layout stability with 5.5kHz pole placement. |
| OPA347UA | 20µA IQ (vs 2.9µA), 350kHz GBW, 2mV VOS - higher power, wider bandwidth, same voltage range. | Suitable for active filters in portable audio; not viable for 10-year battery life targets. | Choose only if system requires >50kHz closed-loop bandwidth and can tolerate 7× higher current draw. |
Compared with TLV2241IDBVR and OPA347UA, the OPA379AIDRG4 uniquely balances sub-3µA quiescent current, 90kHz bandwidth, and rail-to-rail I/O in a production-qualified SOIC-8 - making it optimal for space-constrained, long-duration, low-noise sensing nodes where power and precision are co-constrained.
Availability
OPA379AIDRG4 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical sensors, and handheld test equipment requiring stable component supply with guaranteed long-term manufacturability.
Supply support for OPA379AIDRG4 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 ultra-low-power, high-precision analog front-ends in battery-operated medical, industrial, and portable instrumentation - emphasizing rail-to-rail operation, nanovolt-level noise, and microamp quiescent current at 1.8V.
FAQ
What is the maximum capacitive load the OPA379AIDRG4 can drive stably in unity-gain configuration?
The OPA379AIDRG4 is characterized for stable operation with up to 30pF capacitive load in unity-gain buffer configuration. Exceeding this value may cause overshoot or ringing, as shown in Figure 17 of the SBOS347D datasheet. For loads >30pF, TI recommends adding a 10Ω–20Ω series resistor (RS) between the output and load to restore phase margin without degrading DC accuracy - a technique validated in Figure 21 for the OPA379AIDRG4.
Does the OPA379AIDRG4 support true rail-to-rail input common-mode range?
Yes, the OPA379AIDRG4 supports rail-to-rail input common-mode voltage from V– – 0.1V to V+ + 0.1V, as specified in the Electrical Characteristics table. However, CMRR degrades above (V+ – 1V), and offset voltage increases in the transition region near the positive rail - so for highest precision, keep VCM within (V–) to (V+ – 1V), as confirmed in Figure 8 of the OPA379AIDRG4 datasheet.
What is the thermal resistance (θJA) of the OPA379AIDRG4 in its SOIC-8 package?
The OPA379AIDRG4 in SOIC-8 (package D) has a thermal resistance θJA of 150°C/W, as documented in the "Thermal Resistance" row of the Electrical Characteristics table. This value assumes standard JEDEC 2-layer board conditions and enables full –40°C to +125°C operation without derating at ambient temperatures ≤85°C under typical PCB copper pour layouts.
Can the OPA379AIDRG4 operate from a single 1.8V supply?
Yes, the OPA379AIDRG4 is fully specified and tested for operation from a single 1.8V supply (or dual ±0.9V), with all key parameters - including 90kHz GBW, 2.9µA IQ, and rail-to-rail I/O - guaranteed across the entire 1.8V–5.5V range. Performance curves in Figures 4–7 of the SBOS347D datasheet confirm stable behavior at 1.8V, making the OPA379AIDRG4 suitable for energy-harvesting and coin-cell applications.
Is the OPA379AIDRG4 pin-compatible with other members of the OPA379 family?
No - the OPA379AIDRG4 is a single-channel SOIC-8 variant, while the OPA2379 (dual) and OPA4379 (quad) share the same SOIC-8 and TSSOP-14 footprints respectively but differ in pinout. The OPA379AIDRG4 pin 1 is –IN, whereas OPA2379 SOIC-8 pin 1 is +IN for Channel A. Direct substitution is not possible without PCB redesign; always consult the Pin Configurations section (page 3) of the OPA379AIDRG4 datasheet before interchanging.
OPA379AIDRG4 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:
- 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
OPA379AIDRG4 FAQ
1.How can I place an order for OPA379AIDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA379AIDRG4 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 OPA379AIDRG4 reliable?
The price and inventory of OPA379AIDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA379AIDRG4 is usually 5 days.
3.What payment methods are accepted for OPA379AIDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA379AIDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA379AIDRG4?
OPA379AIDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA379AIDRG4 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 OPA379AIDRG4?
For technical support, including OPA379AIDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA379AIDRG4 requirements.
6.How does Aetrix verify that OPA379AIDRG4 is sourced from the original manufacturer or authorized distributors?
All OPA379AIDRG4 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 OPA379AIDRG4 meets industry standards.
7.What is the process for return or replacement of OPA379AIDRG4?
All OPA379AIDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA379AIDRG4, 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 OPA379AIDRG4 part is unused and in its original packaging.
Return procedure for OPA379AIDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA379AIDRG4 Tags
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