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Texas Instruments OPA2378AIDCNR
- Part No.:
- OPA2378AIDCNR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
OPA2378AIDCNR.pdf
- Description:
- IC OPAMP ZER-DRIFT 2CIRC SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:6,907
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Product details
Overview
OPA2378AIDCNR from Texas Instruments is a dual, rail-to-rail input/output, zero-drift precision operational amplifier optimized for low-noise (0.4 µVPP, 0.1 Hz to 10 Hz), low-power (125 µA per amplifier), and high-precision (20 µV max offset voltage, 0.1 µV/°C drift) signal conditioning in battery-powered systems. It operates from 2.2 V to 5.5 V and delivers 900 kHz gain-bandwidth with EMI filtering, targeting medical sensor front-ends and portable instrumentation.
For engineers reviewing the OPA2378AIDCNR datasheet, OPA2378AIDCNR pinout, OPA2378AIDCNR application, or OPA2378AIDCNR equivalent, key selection criteria include its flicker-noise-free voltage noise density (20 nV/√Hz at 1 kHz), rail-to-rail output swing within 6 mV of rails (RL = 10 kΩ), and guaranteed performance over –40°C to +125°C for industrial and automotive-grade designs.
Technical Context
The OPA2378AIDCNR employs proprietary auto-calibration every 3 µs to eliminate 1/f noise and maintain ultra-low offset drift, using a time-continuous 350 kHz core amplifier. Its internal EMI filter (–3 dB at ~25 MHz) suppresses RF rectification effects without external components.
This dual op amp features matched channel characteristics-including 135 dB dc channel separation-and supports unity-gain stable operation with rail-to-rail input common-mode range extending 50 mV beyond supplies and output swing to within 6 mV of rails under 10 kΩ load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 20 µV max (ensures <0.002% error in 1 V full-scale precision ADC driver applications) |
| Offset Drift | 0.1 µV/°C typ (maintains calibration stability across wide temperature ranges without recalibration) |
| Voltage Noise | 0.4 µVPP (0.1–10 Hz); 20 nV/√Hz @ 1 kHz (enables accurate thermopile and strain gauge signal amplification) |
| Quiescent Current | 125 µA per amplifier (supports >1-year battery life in glucose meters with intermittent sampling) |
| Gain Bandwidth | 900 kHz (allows stable closed-loop gain ≥10 at 50 kHz for anti-aliasing filter interfaces) |
| Supply Range | 2.2 V to 5.5 V (directly powers from single Li-ion or two alkaline cells without regulation) |
| CMRR | 112 dB typ (rejects common-mode interference in unshielded handheld test equipment) |
Pinout & Package
SOT23-8 package: 2.9 mm × 2.8 mm × 1.3 mm body, surface-mount, moisture-sensitive level 1, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Positive supply rail | Accepts 2.2 V to 5.5 V; requires local 0.1 µF bypass capacitor to ground for stability |
| 2 - Out B | Amplifier B output | Rail-to-rail swing (6 mV from rail, RL = 10 kΩ); drives ADC inputs or low-impedance loads directly |
| 3 - In– B | Inverting input B | High-impedance node (±150 pA bias current); connects to feedback network or sensor return path |
| 4 - In+ B | Non-inverting input B | Common-mode range extends 50 mV beyond V– and V+; accepts signals down to –0.05 V with 2.2 V supply |
| 5 - Out A | Amplifier A output | Electrically isolated from Out B; enables independent dual-channel signal paths on single die |
| 6 - In– A | Inverting input A | Matched to In– B for differential pair configurations; supports precision instrumentation amplifier topologies |
| 7 - In+ A | Non-inverting input A | Used with In+ B for common-mode rejection in bridge sensor interfaces (e.g., load cells) |
| 8 - V– | Negative supply rail | Ground reference for single-supply operation; must be connected even when V– = 0 V |
Key Features
| Feature | Design Value |
|---|---|
| Zerø-Drift architecture | Auto-calibrates every 3 µs to eliminate 1/f noise and ensure <0.1 µV/°C drift-critical for long-duration medical measurements |
| EMI filtering | Integrated 25 MHz low-pass filter on inputs rejects RF interference from cellular/WiFi sources without external RC networks |
| Rail-to-rail I/O | Input common-mode range includes both supply rails; output swings to within 6 mV-maximizes dynamic range in 3.3 V systems |
| Low quiescent current | 125 µA per amplifier enables dual-channel precision amplification in sub-250 µA total system sleep modes |
| Channel separation | 135 dB at dc prevents crosstalk between channels in dual-sensor ECG front-ends or stereo audio preamps |
Applications
| Portable Medical Devices | Weigh Scales |
|---|---|
Use Scenario: Signal conditioning for electrochemical glucose sensors in handheld meters, where microamp-level currents require ultra-low-noise, low-drift amplification. IC Role / Device Role / Timing Role: Dual-channel transimpedance amplifier and reference buffer-Amplifier A converts sensor current to voltage; Amplifier B buffers reference electrode potential. Use Value: 0.4 µVPP low-frequency noise ensures ±0.1 mmol/L glucose accuracy; 20 µV offset enables <1% full-scale error without trimming. | Use Scenario: Amplifying mV-level outputs from strain-gauge load cells in battery-powered retail scales. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end-dual op amps configured as difference amplifier with matched gain-setting resistors. Use Value: 135 dB channel separation eliminates inter-channel coupling; rail-to-rail output drives 16-bit SAR ADCs with no headroom loss. |
| Battery-Powered Instruments | Sensor Signal Conditioning |
Use Scenario: Low-power oscilloscope front-end in handheld multimeters, amplifying AC-coupled signals while preserving bandwidth. IC Role / Device Role / Timing Role: Unity-gain buffer and active high-pass filter-Amplifier A buffers probe signal; Amplifier B implements 0.5 Hz HPF with minimal DC drift. Use Value: 900 kHz GBW supports 50 kHz small-signal bandwidth; 125 µA IQ allows continuous operation on AA batteries for >200 hours. | Use Scenario: Thermopile-based non-contact temperature sensing in smart thermostats, where weak DC signals (<100 µV) must be amplified without 1/f noise corruption. IC Role / Device Role / Timing Role: Low-noise DC-coupled amplifier-single amplifier stage with gain ≥100, leveraging zero-drift to avoid thermal drift errors. Use Value: Flicker-noise-free 20 nV/√Hz density at 1 kHz enables sub-0.1°C resolution; 0.1 µV/°C drift prevents calibration drift over seasonal temperature cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333AIDR | Lower IQ (17 µA), lower GBW (350 kHz), same zero-drift architecture and noise profile | Better suited for ultra-low-power wake-on-event systems; insufficient bandwidth for >10 kHz sensor signals | Select OPA2333AIDR only when average current <50 µA is mandatory and bandwidth ≤350 kHz suffices |
| MCP6V82-E/SN | Higher IQ (165 µA), higher offset (25 µV max), no integrated EMI filter | Requires external R-C EMI suppression; better PSRR (120 dB) but less robust in noisy RF environments | Choose MCP6V82-E/SN when PSRR is prioritized over EMI immunity and layout space permits external filtering |
Compared with OPA2378AIDCNR, OPA2333AIDR trades bandwidth for ultra-low power, while MCP6V82-E/SN offers higher PSRR but lacks on-die EMI filtering-making OPA2378AIDCNR optimal for compact, noise-immune, medium-bandwidth precision analog front-ends.
Availability
OPA2378AIDCNR is available at Aetrix Electronics and suitable for portable medical devices, weigh scales, and battery-powered instrumentation requiring stable component supply with guaranteed long-term manufacturability.
Supply support for OPA2378AIDCNR 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 OPA2378AIDCNR belongs to TI's Zerø-Drift Series, designed specifically for high-accuracy, low-drift, low-noise amplification in unregulated battery-powered systems-from glucose meters to industrial sensor nodes.
FAQ
What is the maximum operating temperature range for the OPA2378AIDCNR?
The OPA2378AIDCNR is specified for continuous operation from –40°C to +125°C, with absolute maximum junction temperature rated at +150°C. This extended range supports deployment in automotive cabin modules and industrial control enclosures where ambient temperatures exceed standard commercial limits. The device maintains its 20 µV offset voltage and 0.1 µV/°C drift specification across this full range, as verified in TI's SBOS417D datasheet.
Does the OPA2378AIDCNR require external capacitors for stability?
No, the OPA2378AIDCNR is unity-gain stable and does not require external compensation capacitors. Its internal design ensures phase margin >60° at all gains ≥1, even with capacitive loads up to 100 pF. However, a 0.1 µF ceramic capacitor must be placed between V+ and V– pins, as close as possible to the SOT23-8 package, to suppress supply noise and prevent oscillation-this is mandatory per TI's layout guidelines in SBOS417D.
How does the EMI filtering in the OPA2378AIDCNR improve system-level robustness?
The OPA2378AIDCNR integrates a 25 MHz low-pass filter on both inputs that attenuates RF energy before it reaches the core amplifier, preventing rectification-induced offset shifts during exposure to GSM, WiFi, or Bluetooth signals. Unlike external filters, this on-die solution avoids added parasitics and maintains 900 kHz bandwidth for intended signals-verified by TI's EMI susceptibility testing showing <1 µV offset shift at 800 MHz. This eliminates the need for board-level ferrite beads or RC networks in handheld medical devices.
Can the OPA2378AIDCNR drive an ADC input directly?
Yes, the OPA2378AIDCNR can directly drive SAR and delta-sigma ADC inputs due to its rail-to-rail output swing (within 6 mV of rails at 10 kΩ load), low output impedance (<1 Ω at dc), and fast settling time (7 µs to 0.1%). Its 0.003% THD+N at 1 kHz ensures minimal distortion when buffering full-scale sine waves into 16-bit converters. For optimal performance, use a 10 Ω isolation resistor between OPA2378AIDCNR output and ADC input to dampen charge kickback, as recommended in TI's application notes.
What is the typical channel-to-channel crosstalk performance of the OPA2378AIDCNR?
The OPA2378AIDCNR provides 135 dB of dc channel separation, meaning a full-scale signal on Amplifier A induces less than 1 µV of error on Amplifier B's output. This is achieved through physical layout isolation and matched process design-critical for dual-sensor applications like ECG limb leads or stereo microphone preamps. At 10 kHz, separation remains >100 dB, ensuring clean independent signal paths without external shielding or guard traces.
OPA2378AIDCNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 900 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 150 pA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 125µA (x2 Channels)
- Current - Output / Channel:
- 30 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:
- SOT-23-8
OPA2378AIDCNR FAQ
1.How can I place an order for OPA2378AIDCNR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2378AIDCNR 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 OPA2378AIDCNR reliable?
The price and inventory of OPA2378AIDCNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2378AIDCNR is usually 5 days.
3.What payment methods are accepted for OPA2378AIDCNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2378AIDCNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2378AIDCNR?
OPA2378AIDCNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2378AIDCNR 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 OPA2378AIDCNR?
For technical support, including OPA2378AIDCNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2378AIDCNR requirements.
6.How does Aetrix verify that OPA2378AIDCNR is sourced from the original manufacturer or authorized distributors?
All OPA2378AIDCNR 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 OPA2378AIDCNR meets industry standards.
7.What is the process for return or replacement of OPA2378AIDCNR?
All OPA2378AIDCNR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2378AIDCNR, 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 OPA2378AIDCNR part is unused and in its original packaging.
Return procedure for OPA2378AIDCNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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