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Texas Instruments OPA378AIDBVR
- Part No.:
- OPA378AIDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA378AIDBVR.pdf
- Description:
- IC OPAMP ZER-DRIFT 1CIRC SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,773
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Product details
Overview
OPA378AIDBVR from Texas Instruments is a single-channel, rail-to-rail input/output zero-drift operational amplifier optimized for precision, low-noise, micro-power applications. It delivers 20 µV max input offset voltage, 0.1 µV/°C drift, 20 nV/√Hz voltage noise density at 1 kHz, and operates from 2.2 V to 5.5 V with only 125 µA quiescent current - enabling high-accuracy signal conditioning in portable medical devices and battery-powered instrumentation.
For engineers reviewing the OPA378AIDBVR datasheet, OPA378AIDBVR pinout, OPA378AIDBVR application, or OPA378AIDBVR equivalent, key selection criteria include its flicker-noise-free architecture, EMI-filtered inputs, ±150 pA typical input bias current, and guaranteed performance from –40°C to +125°C in the SOT23-5 package.
Technical Context
The OPA378AIDBVR employs proprietary auto-calibration circuitry that continuously corrects input offset every 3 µs without introducing aliasing or 1/f noise - resulting in stable DC precision over time and temperature. Its internal EMI filter (–3 dB at ~25 MHz) suppresses high-frequency interference before rectification occurs at input junctions.
This device integrates a 900 kHz gain-bandwidth product with 0.4 V/µs slew rate and unity-gain stability, while maintaining rail-to-rail output swing within 6 mV of supply rails (RL = 10 kΩ). Its 110 dB open-loop gain and 112 dB CMRR at 5.5 V ensure minimal error in high-resolution ADC driver configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 20 µV max - enables sub-16-bit accuracy in 3.3 V systems without calibration. |
| Offset Drift | 0.1 µV/°C typ - ensures <1 µV total drift across –40°C to +85°C industrial range. |
| Voltage Noise Density | 20 nV/√Hz at 1 kHz - supports low-noise sensor amplification without dominant 1/f component. |
| Quiescent Current | 125 µA typ - allows continuous operation for >1 year on a single CR2032 coin cell in handheld meters. |
| Supply Range | 2.2 V to 5.5 V - compatible with unregulated Li-ion, alkaline, or coin-cell sources without LDO. |
| Gain-Bandwidth Product | 900 kHz - sufficient for anti-alias filtering and sensor signal conditioning up to ~100 kHz. |
| CMRR | 112 dB typ at 5.5 V - rejects common-mode noise in bridge-based transducer interfaces. |
Pinout & Package
OPA378AIDBVR is packaged in a 5-pin SOT23-5 (DBV) surface-mount package with 0.95 mm pitch, thermal resistance θJA = 200°C/W, and rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V−) | Negative Supply Rail | Connects to ground or negative rail; supports rail-to-rail input down to V− − 0.05 V. |
| 2 (In−) | Inverting Input | Differential input node with 4 pF differential capacitance; protected by EMI filter and clamp diodes. |
| 3 (Out) | Output | Rail-to-rail output capable of sourcing/sinking ±30 mA; swings within 6 mV of rails at 10 kΩ load. |
| 4 (In+) | Non-inverting Input | High-impedance input (±150 pA bias current); common-mode range extends 50 mV beyond supplies. |
| 5 (V+) | Positive Supply Rail | Accepts 2.2 V to 5.5 V; PSRR is 1.5 µV/V typical, enabling direct battery connection. |
Key Features
| Feature | Design Value |
|---|---|
| Zerø-Drift Auto-Calibration | Continuous 3 µs offset correction eliminates 1/f noise and ensures <0.25 µV/°C max drift over full temp range. |
| Flicker-Noise-Free Operation | No 0.1 Hz–10 Hz 1/f corner - 0.4 µVPP integrated noise enables stable DC measurements. |
| EMI Filtering | Integrated 25 MHz low-pass filter on both inputs reduces RF rectification-induced offset shifts. |
| Rail-to-Rail I/O | Input accepts signals from V− − 0.05 V to V+ + 0.05 V; output drives within 6 mV of either rail at 10 kΩ. |
| Low Quiescent Power | 125 µA IQ enables always-on sensing in portable devices without compromising precision. |
Applications
| Glucose Meter Front-End | Oxygen Sensor Signal Chain |
|---|---|
Use Scenario: Amplifies low-level current from electrochemical glucose sensor electrodes under varying temperature and humidity. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with ultra-low input bias current and near-zero drift to preserve calibration integrity over shelf life. Use Value: Enables <±2% measurement accuracy across –20°C to +50°C without recalibration, meeting ISO 15197:2013 requirements. | Use Scenario: Conditions analog output of Clark-type oxygen sensor in portable ventilators and pulse oximeters. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail buffer and gain stage driving 16-bit SAR ADC with no missing codes. Use Value: 20 nV/√Hz noise floor and 112 dB CMRR prevent ambient EMI and supply ripple from degrading SpO₂ resolution. |
| Weigh Scale Load Cell Interface | Thermopile-Based Temperature Monitor |
Use Scenario: Amplifies µV-level Wheatstone bridge output from strain-gauge load cells in battery-powered scales. IC Role / Device Role / Timing Role: Zero-drift instrumentation front-end with 20 µV offset and 0.1 µV/°C drift for stable zero-point reference. Use Value: Eliminates warm-up drift and temperature-induced zero-shift, enabling <10 mg repeatability on 5 kg full-scale units. | Use Scenario: Amplifies low-amplitude, high-impedance thermopile voltage in contactless ear thermometers and HVAC sensors. IC Role / Device Role / Timing Role: High-input-impedance, low-bias-current amplifier with EMI filtering to reject 50/60 Hz and RF interference. Use Value: ±150 pA input bias and 25 MHz EMI filter prevent thermoelectric errors and ambient noise corruption of <100 µV signals. |
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. | Better for ultra-low-power (<10 µA) DC-coupled applications where bandwidth <100 kHz suffices. | Select when power budget is tighter than noise or EMI immunity requirements. |
| MCP6V81T-E/OT | 1.8 V min supply, 1.2 µV/°C max drift, 12 nV/√Hz noise, no integrated EMI filter. | Suitable for 1.8 V–5.5 V systems requiring wider supply range but less stringent EMI rejection. | Prefer when operating below 2.2 V or when external EMI filtering is already implemented. |
Compared with OPA333AIDBVR and MCP6V81T-E/OT, the OPA378AIDBVR uniquely combines 900 kHz bandwidth, 20 nV/√Hz noise, and on-die 25 MHz EMI filtering - making it optimal for precision, battery-powered sensor interfaces where signal integrity and RF immunity are co-critical.
Availability
OPA378AIDBVR 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 long production lifecycles.
Supply support for OPA378AIDBVR 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 innovation in precision amplifiers and signal-chain solutions.
The OPA378AIDBVR belongs to TI's Zerø-Drift Series, designed specifically for high-accuracy, low-power, single-supply sensor signal conditioning in portable and industrial measurement systems.
FAQ
What is the maximum supply voltage for OPA378AIDBVR?
The absolute maximum supply voltage for OPA378AIDBVR is +7 V, but 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 the 2.2–5.5 V range, OPA378AIDBVR maintains full specification compliance including 20 µV offset and 125 µA quiescent current. Always observe derating guidelines for reliability at temperature extremes.
Does OPA378AIDBVR require external capacitors for stability?
No, OPA378AIDBVR is unity-gain stable and does not require external compensation capacitors. Its internal architecture ensures phase margin >60° at all gains ≥1 with capacitive loads up to 100 pF (per Figure 18). For loads >100 pF, a small series resistor (e.g., 10–50 Ω) between output and load is recommended to maintain stability - verified in TI's SBOS417D datasheet.
How does the EMI filter in OPA378AIDBVR improve system-level robustness?
The OPA378AIDBVR integrates a 25 MHz low-pass EMI filter on both inputs to attenuate RF energy before it reaches the core amplifier, preventing rectification-induced offset shifts. This design reduces susceptibility to GSM bursts, Wi-Fi harmonics, and switching regulator noise - confirmed by TI's testing showing 29 dB suppression at 800 MHz. In real-world portable medical designs, this eliminates need for external RC filters, saving board space and cost.
Can OPA378AIDBVR drive a 16-bit SAR ADC directly?
Yes, OPA378AIDBVR is well-suited to drive 16-bit SAR ADCs such as the ADS8325 or ADS1115. Its rail-to-rail output swings within 6 mV of supply rails (at 10 kΩ), 110 dB open-loop gain ensures <0.001% gain error, and 0.4 µVPP 0.1–10 Hz noise prevents code transitions from being obscured. Layout best practices - including 0.1 µF supply bypass and short traces - are recommended to preserve SNR.
What is the input common-mode voltage range of OPA378AIDBVR?
The input common-mode voltage range of OPA378AIDBVR extends from (V−) − 0.05 V to (V+) + 0.05 V, enabling true rail-to-rail input operation. At 5.5 V supply, this covers –0.05 V to +5.55 V. This feature allows direct interfacing with sensors whose outputs exceed the supply (e.g., thermocouples), provided input current is limited to ≤10 mA using series resistors - as specified in TI's Applications Information section.
OPA378AIDBVR 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
OPA378AIDBVR FAQ
1.How can I place an order for OPA378AIDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA378AIDBVR 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 OPA378AIDBVR reliable?
The price and inventory of OPA378AIDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA378AIDBVR is usually 5 days.
3.What payment methods are accepted for OPA378AIDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA378AIDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA378AIDBVR?
OPA378AIDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA378AIDBVR 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 OPA378AIDBVR?
For technical support, including OPA378AIDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA378AIDBVR requirements.
6.How does Aetrix verify that OPA378AIDBVR is sourced from the original manufacturer or authorized distributors?
All OPA378AIDBVR 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 OPA378AIDBVR meets industry standards.
7.What is the process for return or replacement of OPA378AIDBVR?
All OPA378AIDBVR units undergo pre-shipment inspection (PSI). If there is an issue with OPA378AIDBVR, 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 OPA378AIDBVR part is unused and in its original packaging.
Return procedure for OPA378AIDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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