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Texas Instruments OPA376AIDR
- Part No.:
- OPA376AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA376AIDR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,797
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Product details
Overview
OPA376AIDR from Texas Instruments is a precision rail-to-rail input/output operational amplifier optimized for low-noise, low-quiescent-current signal conditioning in battery-powered and high-resolution data acquisition systems. It delivers 7.5 nV/√Hz input voltage noise at 1 kHz, 5 μV typical offset voltage, 5.5-MHz gain bandwidth, and operates from 2.2 V to 5.5 V single supply - enabling high-fidelity ADC buffering in portable medical and test equipment.
For engineers reviewing the OPA376AIDR datasheet, OPA376AIDR pinout, OPA376AIDR application, or OPA376AIDR equivalent, key selection criteria include its e-trim™-enabled dc precision (25 μV max offset), 760 μA typical quiescent current, 0.8 μVPP 0.1–10 Hz noise, rail-to-rail swing within 20 mV of rails (at 10 kΩ), and stability driving up to 250 pF capacitive loads in unity-gain configuration.
Technical Context
The OPA376AIDR employs TI's proprietary e-trim™ process to achieve factory-trimmed input offset voltage and drift, eliminating post-manufacturing calibration needs. Its CMOS input stage enables ultra-low input bias current (0.2 pA typ) and high input impedance (>1013 Ω), critical for high-source-impedance sensor interfaces.
Internally compensated for unity-gain stability, it features a 5.5-MHz gain-bandwidth product with 2 V/μs slew rate and 0.33 μs overload recovery time. The device maintains >76 dB CMRR and >90 dB PSRR across 2.2–5.5 V supply range and –40°C to +125°C temperature range, supporting robust operation in unregulated battery systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 5.5 MHz - supports stable closed-loop gain ≥1 with bandwidth up to 5.5 MHz for fast settling in data acquisition. |
| Input Offset Voltage (max) | 25 μV - ensures ≤0.001% gain error in 1-V full-scale precision measurement paths. |
| Quiescent Current (typ) | 760 μA - enables multi-channel, always-on sensing in energy-constrained IoT nodes. |
| Voltage Noise Density | 7.5 nV/√Hz at 1 kHz - preserves SNR in 16-bit+ ADC front-ends with source impedances <10 kΩ. |
| Supply Voltage Range | 2.2 V to 5.5 V - directly powers from single Li-ion, two alkaline, or regulated 3.3 V rails without LDO overhead. |
| Output Swing (RL = 10 kΩ) | Within 20 mV of rails - maximizes dynamic range when interfacing with 3.3 V or 5 V SAR ADCs. |
| 0.1–10 Hz Noise | 0.8 μVPP - minimizes baseline drift in DC-coupled medical instrumentation like ECG amplifiers. |
Pinout & Package
OPA376AIDR is packaged in an 8-pin SOIC (D package) with 4.90 mm × 3.91 mm body size, rated for –40°C to +125°C operation and compatible with standard reflow soldering profiles.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output node; rail-to-rail capable, drives 10 kΩ load to within 20 mV of supply rails. |
| 2 | V− | Negative supply terminal; accepts 0 V (single-supply) or negative rail; internal ESD diodes clamp ±0.5 V beyond rails. |
| 3 | +IN | Non-inverting input; CMOS input with 0.2 pA bias current, supports common-mode range from V− −0.1 V to V+ +0.1 V. |
| 4 | V− | Shared negative supply pin (dual-function pin numbering per SOIC layout; electrically identical to Pin 2). |
| 5 | −IN | Inverting input; matched to +IN for optimal CMRR; sensitive to PCB leakage due to femtoamp-level bias current. |
| 6 | OUT | Redundant output pin (dual-function pin numbering); electrically connected to Pin 1 for enhanced thermal/power delivery in SOIC-8. |
| 7 | V+ | Positive supply terminal; operates down to 2.2 V; PSRR >90 dB ensures immunity to supply ripple in noisy environments. |
| 8 | NC | No internal connection; must be left floating or tied to ground for mechanical stability - not usable as guard or shield. |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ DC Precision | Factory-trimmed offset (5 μV typ, 25 μV max) and drift (0.26 μV/°C typ) eliminate system-level calibration. |
| Rail-to-Rail I/O | Input common-mode extends 100 mV beyond supplies; output swings to within 20 mV - maximizes usable signal range in low-voltage systems. |
| Low 0.1–10 Hz Noise | 0.8 μVPP - enables stable DC-coupled amplification in electrochemical sensors and thermopile-based temperature measurement. |
| Capacitive Load Drive | Stable with up to 250 pF in unity-gain buffer configuration - simplifies anti-aliasing filter design without external compensation. |
| High PSRR & CMRR | >90 dB PSRR and >76 dB CMRR over full temp/supply range - rejects power rail noise and common-mode interference in mixed-signal PCBs. |
Applications
| ADC Buffer | Medical Instrumentation |
|---|---|
Use Scenario: Driving the analog input of a 16-bit SAR ADC (e.g., ADS8327) in a portable blood glucose meter. IC Role / Device Role / Timing Role: Precision voltage follower providing low-impedance, low-noise, rail-to-rail buffered signal to ADC sample capacitor. Use Value: 7.5 nV/√Hz noise and 0.33 μs overload recovery prevent sampling errors and maintain ENOB >15 bits at 250 kSPS. |
Use Scenario: Front-end amplification of microvolt-level ECG signals in a wearable Holter monitor. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier gain stage with DC-coupled input and high common-mode rejection. Use Value: 0.8 μVPP 0.1–10 Hz noise and 25 μV max offset preserve ST-segment morphology without baseline wander correction. |
| Handheld Test Equipment | Active Filtering |
Use Scenario: Signal conditioning in a battery-powered handheld multimeter measuring µA-level leakage currents. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photodiode or DUT current into precise voltage with minimal self-heating. Use Value: 0.2 pA input bias current prevents measurement offset errors; 760 μA quiescent current extends battery life beyond 100 hours. |
Use Scenario: Second-order Butterworth anti-aliasing filter preceding a 500 kSPS ADC in an oscilloscope probe interface. IC Role / Device Role / Timing Role: Unity-gain stable active filter stage with 50 kHz cutoff, configured for maximally flat passband response. Use Value: 5.5-MHz GBW and 2 V/μs slew rate ensure <0.01% settling in <2 μs, preserving transient fidelity up to Nyquist frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDR | Zero-drift architecture; 0.1 μV max offset, 0.02 μV/°C drift; higher 17 μA IQ; 350 kHz GBW. | Better for sub-μV offset-critical DC applications (e.g., strain gauge bridges); unsuitable for >100 kHz signal paths. | Select OPA333AIDR only when ultra-low drift dominates over bandwidth and quiescent power. |
| MCP6V81-E/SN | Auto-zero topology; 2 μV max offset, 0.0125 μV/°C drift; 1.1 mA IQ; 10 MHz GBW; requires external 100 nF bypass cap on VDD. | Higher speed and lower drift than OPA376AIDR but consumes >1.4× quiescent current; less suitable for coin-cell operation. | Choose MCP6V81-E/SN when 10 MHz bandwidth and <2 μV offset are mandatory, and supply current <1.1 mA is acceptable. |
Compared with OPA376AIDR, OPA333AIDR trades bandwidth and power efficiency for superior dc stability, while MCP6V81-E/SN offers higher speed and lower drift at significantly higher quiescent current - making OPA376AIDR the optimal balance for portable 16-bit+ data acquisition where noise, power, and 5.5-MHz bandwidth are co-primary constraints.
Availability
OPA376AIDR is available at Aetrix Electronics and suitable for portable medical devices, handheld test instruments, and high-resolution data loggers requiring stable component supply with guaranteed long-term manufacturability and automotive-grade temperature support.
Supply support for OPA376AIDR 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 signal chain solutions.
The OPA376AIDR belongs to TI's e-trim™ precision op amp product line, engineered specifically for battery-powered, high-resolution measurement systems demanding low noise, low power, and exceptional dc accuracy without calibration.
FAQ
What is the maximum capacitive load the OPA376AIDR can drive stably in unity-gain configuration?
The OPA376AIDR is specified to drive up to 250 pF of pure capacitive load stably in unity-gain buffer configuration without external compensation. This capability simplifies anti-aliasing filter design and eliminates need for isolation resistors in many ADC driver applications. For loads exceeding 250 pF, a small series resistor (10–20 Ω) between output and capacitance restores phase margin while preserving dc accuracy - verified in TI's SBOS406G datasheet Figure 16 and Section 7.3.3.
Does the OPA376AIDR support true rail-to-rail input common-mode voltage range?
Yes, the OPA376AIDR supports rail-to-rail input with a common-mode voltage range extending from (V−) − 0.1 V to (V+) + 0.1 V. However, input offset voltage remains lowest (≤5 μV typ) only within the extended range of (V−) to (V+) − 1.3 V. Beyond (V+) − 1.3 V, offset increases - as confirmed in Electrical Characteristics Table 6.7 and Figure 23 of the SBOS406G datasheet. This makes it ideal for single-supply systems where inputs approach but do not exceed the positive rail by more than ~1 V.
What is the typical quiescent current of the OPA376AIDR and how does it vary with supply voltage?
The OPA376AIDR draws 760 μA typical quiescent current at 5.5 V supply and 25°C, rising to 950 μA maximum across temperature and voltage extremes. Per Figure 9 in SBOS406G, IQ remains stable between 2.2 V and 5.5 V - varying by <±5% over that range - confirming consistent low-power operation across battery discharge curves. This stability enables predictable runtime estimation in coin-cell or Li-ion powered devices using OPA376AIDR.
How does the e-trim™ technology in the OPA376AIDR improve system-level performance?
e-trim™ is TI's proprietary wafer-level trimming process that adjusts internal offset voltage and drift during final test, achieving 5 μV typical and 25 μV maximum input offset without post-assembly calibration. This eliminates production-line trimming steps, reduces BOM cost, and ensures consistent performance across temperature (0.26 μV/°C typ drift). As documented in Section 7.3.2 and Feature Description, e-trim™ directly enables OPA376AIDR's use in uncalibrated portable instrumentation where factory calibration is impractical.
Is the OPA376AIDR pin-compatible with other members of the OPAx376 family?
No - the OPA376AIDR (single-channel, SOIC-8) is not pin-compatible with OPA2376 (dual) or OPA4376 (quad), which use different pinouts and package footprints (e.g., VSSOP-8, TSSOP-14). Even among single-channel variants, OPA376AIDR (SOIC-8) differs from OPA376AIDBVR (SOT-23-5) and OPA376AIDCKR (SC70-5) in pin count and assignment. Pin compatibility is only guaranteed within identical package types and channel counts - always verify against the specific device's Pin Configuration diagram in SBOS406G Section 5.
OPA376AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- e-trim™
- 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:
- Single Ended, Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 5.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- 760µA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.2 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
OPA376AIDR FAQ
1.How can I place an order for OPA376AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA376AIDR 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 OPA376AIDR reliable?
The price and inventory of OPA376AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA376AIDR is usually 5 days.
3.What payment methods are accepted for OPA376AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA376AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA376AIDR?
OPA376AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA376AIDR 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 OPA376AIDR?
For technical support, including OPA376AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA376AIDR requirements.
6.How does Aetrix verify that OPA376AIDR is sourced from the original manufacturer or authorized distributors?
All OPA376AIDR 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 OPA376AIDR meets industry standards.
7.What is the process for return or replacement of OPA376AIDR?
All OPA376AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA376AIDR, 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 OPA376AIDR part is unused and in its original packaging.
Return procedure for OPA376AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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