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Texas Instruments OPA378AIDBVT
- Part No.:
- OPA378AIDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA378AIDBVT.pdf
- Description:
- IC OPAMP ZER-DRIFT 1CIRC SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,472
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Product details
Overview
OPA378AIDBVT from Texas Instruments is a single-channel, rail-to-rail input/output, zero-drift precision operational amplifier optimized for low-noise (0.4 µVPP, 0.1–10 Hz), low-power (125 µA quiescent current), 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, delivers 900 kHz gain-bandwidth, and supports medical-grade sensor interfaces such as glucose meters and thermopile modules.
For engineers reviewing the OPA378AIDBVT datasheet, OPA378AIDBVT pinout, OPA378AIDBVT application, or OPA378AIDBVT equivalent, this page provides verified specifications, SC70-5/SOT23-5 package mapping, EMI-filtered input architecture, noise spectral density data, and validated alternatives for portable instrumentation and precision analog front-ends.
Technical Context
The OPA378AIDBVT employs proprietary auto-calibration with continuous 350 kHz core amplification and zero-drift correction every 3 µs-eliminating 1/f flicker noise while maintaining 20 nV/√Hz voltage noise density at 1 kHz. Its internal EMI filter (–3 dB at ~25 MHz) suppresses RF rectification effects on input pins.
It features rail-to-rail input common-mode range extending 50 mV beyond supplies, 112 dB CMRR (typ), 1.5 µV/V PSRR (typ), and output swing within 6 mV of rails (RL = 10 kΩ), enabling direct ADC driving without linearity degradation in unregulated single-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 20 µV max - ensures ≤0.002% error in 1 V full-scale sensor outputs without trimming |
| Offset Drift | 0.1 µV/°C - maintains <1 µV total drift over –40°C to +85°C industrial range |
| Voltage Noise | 0.4 µVPP (0.1–10 Hz) - enables sub-µV resolution in DC-coupled weigh scale and thermocouple circuits |
| Quiescent Current | 125 µA - allows >1-year battery life in coin-cell–powered handheld test equipment |
| Gain Bandwidth | 900 kHz - supports stable unity-gain operation with ≥60° phase margin into 100 pF capacitive loads |
| Supply Range | 2.2 V to 5.5 V - operates directly from single Li-ion or two alkaline cells without LDO regulation |
| Input Common-Mode Range | (V–) – 0.05 V to (V+) + 0.05 V - accommodates signals beyond rails in bridge-sensor applications |
Pinout & Package
OPA378AIDBVT is available in SOT23-5 (DBV) and SC70-5 (DCK) packages. The DBV variant uses the standard SOT23-5 pinout: Pin 1 = V–, Pin 2 = In–, Pin 3 = In+, Pin 4 = V+, Pin 5 = Out.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (V–) | Negative supply terminal | Reference for internal biasing; accepts ground or negative rail; must be ≤0.3 V below In–/In+ to avoid diode conduction |
| Pin 2 (In–) | Inverting input | High-impedance node (±150 pA bias current); connects to feedback network in closed-loop configurations |
| Pin 3 (In+) | Non-inverting input | High-impedance node with EMI filtering; common-mode range extends 50 mV beyond supply rails |
| Pin 4 (V+) | Positive supply terminal | Accepts 2.2–5.5 V; internal ESD clamps limit transient overvoltage to ±0.3 V beyond rails |
| Pin 5 (Out) | Amplifier output | Rail-to-rail capable; drives 10 kΩ load within 6 mV of either rail; stable with ≥100 pF capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Zerø-Drift Auto-Calibration | Continuous 3 µs correction cycle eliminates 1/f noise and holds offset drift ≤0.1 µV/°C over temperature |
| EMI Input Filtering | Integrated 25 MHz low-pass filter reduces RF-induced offset shifts from cellular/WiFi interference |
| Rail-to-Rail I/O | Input common-mode extends 50 mV beyond supplies; output swings to within 6 mV of rails at 10 kΩ |
| Low-Power Precision | 125 µA IQ enables microamp-level system power budgets while delivering 900 kHz bandwidth and 110 dB open-loop gain |
| High PSRR & CMRR | 1.5 µV/V PSRR and 112 dB CMRR ensure stable DC accuracy in noisy, single-supply battery environments |
Applications
| Portable Medical Devices | Battery-Powered Instruments |
|---|---|
Use Scenario: Signal amplification in handheld glucose meters using electrochemical sensors with µA-level output currents. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting sensor current to voltage with minimal offset drift across body-temperature range. Use Value: 20 µV offset and 0.1 µV/°C drift prevent calibration drift errors; 0.4 µVPP noise preserves detection of low-concentration analyte signals. | Use Scenario: Front-end conditioning for thermopile-based non-contact temperature sensors in HVAC remotes. IC Role / Device Role / Timing Role: Low-noise, DC-coupled amplifier boosting µV-level thermopile outputs before 16-bit ADC digitization. Use Value: 20 nV/√Hz noise density and rail-to-rail output maximize dynamic range; 125 µA IQ extends AA-battery life beyond 2 years. |
| Weigh Scales | Sensor Signal Conditioning |
Use Scenario: Amplifying mV-level outputs from strain-gauge bridges in compact digital kitchen scales. IC Role / Device Role / Timing Role: Instrumentation-grade buffer with high CMRR rejecting common-mode noise from AC mains coupling. Use Value: 112 dB CMRR and 1.5 µV/V PSRR reject 50/60 Hz interference without external filtering; SC70-5 footprint saves PCB area. | Use Scenario: Signal conditioning for K-type thermocouples in portable data loggers with cold-junction compensation. IC Role / Device Role / Timing Role: Precision gain stage with low thermal EMF inputs minimizing Seebeck-induced offset errors. Use Value: Ultra-low 150 pA input bias current and matched input traces reduce thermoelectric voltage errors to <0.1 µV/°C gradient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Same Zerø-Drift architecture but lower GBW (350 kHz), higher IQ (17 µA), and no EMI filter | Limited to lower-bandwidth DC applications; unsuitable for ECG or fast step-response designs | Select when ultra-low IQ (<20 µA) is critical and 350 kHz GBW suffices |
| MCP6V81T-E/OT | Zero-drift op-amp with 1.2 MHz GBW, 1.6 µV offset, but higher IQ (170 µA) and no specified EMI rejection | Better bandwidth for active filters, but lacks documented RF immunity for portable medical use | Select when higher speed is required and EMI robustness is secondary |
Compared with OPA333AIDBVR and MCP6V81T-E/OT, the OPA378AIDBVT uniquely balances 900 kHz bandwidth, 125 µA IQ, 0.4 µVPP noise, and integrated EMI filtering-making it optimal for regulated-free, battery-operated precision analog front-ends where RF immunity and DC stability are co-critical.
Availability
OPA378AIDBVT is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instruments, and sensor signal conditioning requiring stable component supply across industrial temperature ranges (–40°C to +125°C).
Supply support for OPA378AIDBVT 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 amplifiers and low-power signal chains.
The OPA378AIDBVT belongs to TI's Zerø-Drift Series, designed specifically for microPOWER, low-noise, rail-to-rail precision amplification in unregulated, single-supply portable instrumentation and medical sensing applications.
FAQ
What is the maximum supply voltage for OPA378AIDBVT?
The absolute maximum supply voltage for OPA378AIDBVT is +7 V. However, the recommended operating range is 2.2 V to 5.5 V. Exceeding +7 V risks permanent damage per TI's Absolute Maximum Ratings. Within its 2.2–5.5 V range, OPA378AIDBVT maintains full specification compliance including 20 µV offset, 0.1 µV/°C drift, and 900 kHz bandwidth.
Does OPA378AIDBVT support rail-to-rail input and output simultaneously?
Yes, OPA378AIDBVT supports rail-to-rail input common-mode range (V– – 0.05 V to V+ + 0.05 V) and rail-to-rail output swing (within 6 mV of either rail at RL = 10 kΩ). This dual rail-to-rail capability enables true single-supply operation in sensor interfaces like thermocouples and bridge amplifiers where input signals approach supply rails and output must drive ADC reference points directly.
How does the EMI filter in OPA378AIDBVT improve system reliability?
The OPA378AIDBVT integrates an internal 25 MHz low-pass EMI filter on both input terminals, reducing susceptibility to RF interference from WiFi, Bluetooth, or cellular sources. This prevents rectification-induced DC offset shifts-verified by TI's testing showing <29 dB attenuation at 800 MHz. In portable medical devices, this eliminates need for external ferrite beads or RC filters, simplifying layout and improving long-term measurement stability of OPA378AIDBVT.
What is the typical quiescent current of OPA378AIDBVT at 5.5 V supply?
The typical quiescent current of OPA378AIDBVT is 125 µA at VS = +5.5 V and TA = +25°C, with a maximum of 150 µA over temperature (–40°C to +125°C). This ultra-low IQ enables multi-year battery life in coin-cell–powered devices. For example, in a 200 µA system budget, OPA378AIDBVT consumes only 62.5% of available current-leaving headroom for MCU sleep modes and wireless transmission bursts.
Can OPA378AIDBVT drive capacitive loads without oscillation?
Yes, OPA378AIDBVT is unity-gain stable and characterized to drive ≥100 pF capacitive loads without peaking or oscillation, as confirmed in Figure 18 of the SBOS417D datasheet. Its internal compensation and low-output-impedance design allow direct connection to ADC input capacitors or long PCB traces. For loads >100 pF, a small series resistor (e.g., 10–50 Ω) between OPA378AIDBVT output and capacitance restores phase margin while preserving DC accuracy.
OPA378AIDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- 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
- 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-23-5
OPA378AIDBVT FAQ
1.How can I place an order for OPA378AIDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA378AIDBVT 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 OPA378AIDBVT reliable?
The price and inventory of OPA378AIDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA378AIDBVT is usually 5 days.
3.What payment methods are accepted for OPA378AIDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA378AIDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA378AIDBVT?
OPA378AIDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA378AIDBVT 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 OPA378AIDBVT?
For technical support, including OPA378AIDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA378AIDBVT requirements.
6.How does Aetrix verify that OPA378AIDBVT is sourced from the original manufacturer or authorized distributors?
All OPA378AIDBVT 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 OPA378AIDBVT meets industry standards.
7.What is the process for return or replacement of OPA378AIDBVT?
All OPA378AIDBVT units undergo pre-shipment inspection (PSI). If there is an issue with OPA378AIDBVT, 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 OPA378AIDBVT part is unused and in its original packaging.
Return procedure for OPA378AIDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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