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Texas Instruments OPA378AIDCKR
- Part No.:
- OPA378AIDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA378AIDCKR.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,069
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Product details
Overview
OPA378AIDCKR from Texas Instruments is a single-channel, rail-to-rail input/output, zero-drift precision operational amplifier optimized for low-noise, low-power, battery-operated sensor signal conditioning. It delivers 20 µV max input offset voltage, 0.1 µV/°C drift, 20 nV/√Hz voltage noise density at 1 kHz, and 125 µA quiescent current across 2.2 V to 5.5 V supply - enabling high-accuracy front-end amplification in glucose meters and thermopile modules.
For engineers reviewing the OPA378AIDCKR datasheet, OPA378AIDCKR pinout, OPA378AIDCKR application, or OPA378AIDCKR equivalent, key selection criteria include its flicker-noise-free architecture, EMI-filtered SC70-5 package, guaranteed performance from –40°C to +125°C, and compatibility with unregulated single-cell Li-ion or alkaline supplies without external regulation.
Technical Context
The OPA378AIDCKR employs a proprietary auto-calibration technique that continuously corrects input offset every 3 µs using a time-continuous 350 kHz core amplifier - eliminating 1/f (flicker) noise while maintaining unity-gain stability and no phase reversal. Its internal EMI filter provides 29 dB rejection at 800 MHz via integrated 1.5 kΩ resistors and parasitic capacitance on both common-mode and differential inputs.
This architecture enables simultaneous optimization of precision (20 µV VOS, 0.1 µV/°C drift), low noise (0.4 µVPP @ 0.1–10 Hz), and ultra-low power (125 µA IQ) - making it distinct from chopper-stabilized amplifiers with aliasing risks or standard CMOS op amps lacking drift compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 20 µV max - ensures ≤0.02% gain error in 1 V full-scale sensor interfaces without calibration. |
| Offset Drift | 0.1 µV/°C max - maintains <1 µV total drift over 85°C industrial temperature range. |
| Voltage Noise Density | 20 nV/√Hz @ 1 kHz - supports sub-16-bit ENOB in 10 kHz bandwidth ADC driver applications. |
| Quiescent Current | 125 µA typical - enables >1-year battery life in portable medical devices drawing <10 µA average system current. |
| Supply Range | 2.2 V to 5.5 V - operates directly from single-cell Li-ion (3.0–4.2 V) or two alkaline cells (2.4–3.2 V) without LDO. |
| Gain Bandwidth | 900 kHz - sufficient for closed-loop control of thermocouple amplifiers and weigh scale strain gauge bridges. |
| Rail-to-Rail I/O | Input extends 50 mV beyond rails; output swings within 8 mV of rails @ 10 kΩ - maximizes dynamic range in 3.3 V systems. |
Pinout & Package
OPA378AIDCKR is packaged in SC70-5 (DCK), a 1.25 mm × 1.65 mm surface-mount package with 0.65 mm pitch. Pin 1 is marked by a dot; top-view pinout is: 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 all internal biasing; must be connected to lowest system potential (e.g., GND or negative rail). |
| Pin 2 (In−) | Inverting input | Accepts feedback network or inverted signal path; input common-mode range extends to V− − 0.05 V. |
| Pin 3 (In+) | Non-inverting input | Accepts reference or sensor signal; input common-mode range extends to V+ + 0.05 V. |
| Pin 4 (V+) | Positive supply terminal | Supplies core amplifier and output stage; PSRR of 1.5 µV/V minimizes sensitivity to supply ripple. |
| Pin 5 (Out) | Amplifier output | Drives ADC input or next-stage filter; rail-to-rail swing enables full utilization of 3.3 V ADC reference. |
Key Features
| Feature | Design Value |
|---|---|
| Zerø-Drift auto-calibration | Continuous 3 µs offset correction eliminates 1/f noise and guarantees <20 µV VOS over lifetime and temperature. |
| EMI filtering | Integrated 25 MHz low-pass filter on inputs reduces RF rectification effects from GSM, Wi-Fi, or switching regulators. |
| Rail-to-rail input/output | Enables direct interfacing with low-voltage ADCs (e.g., ADS1115) without level-shifting or supply boosting. |
| MicroSIZE SC70-5 | 1.25 mm × 1.65 mm footprint saves PCB area in space-constrained wearables and handheld test equipment. |
| Low 0.1 Hz–10 Hz noise | 0.4 µVPP enables stable DC-coupled amplification of slow thermopile or load cell outputs without AC coupling. |
Applications
| Glucose Meter Front-End | Oxygen Sensor Amplifier |
|---|---|
|
Use Scenario: Amplifies weak current from electrochemical glucose sensor electrodes before ADC conversion. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with ultra-low input bias current (±150 pA) and near-zero drift to preserve calibration stability across shelf life. Use Value: Enables ±0.5% glucose measurement accuracy over 0–50°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 for microamp-level sensor currents with minimal thermal EMF contribution. Use Value: Delivers <1 µV/°C offset drift and 20 nV/√Hz noise to resolve 0.1% O₂ concentration changes in 200 ms response time. |
| Weigh Scale Strain Gauge Interface | Thermopile-Based Temperature Module |
|
Use Scenario: Amplifies mV-level bridge output from precision load cells in retail and industrial scales. IC Role / Device Role / Timing Role: High-PSRR (112 dB) instrumentation-grade amplifier rejecting mains-borne noise in unshielded environments. Use Value: Achieves 100,000-count resolution with <0.001% nonlinearity error, supporting NTEP Class III certification. |
Use Scenario: Amplifies low-amplitude, low-frequency thermopile voltage (µV/°C) in contactless ear or forehead thermometers. IC Role / Device Role / Timing Role: DC-coupled, flicker-noise-free amplifier with 0.4 µVPP 0.1–10 Hz noise for sub-0.1°C resolution. Use Value: Eliminates need for AC coupling and synchronous demodulation, reducing BOM count and firmware complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDCKR | Lower quiescent current (17 µA), but higher 0.1–10 Hz noise (1.4 µVPP) and slower GBW (350 kHz). | Better for multi-year battery life in always-on IoT sensors; less suitable for fast-sampling medical diagnostics. | Select OPA333AIDCKR only when ultra-low IQ dominates over noise and bandwidth requirements. |
| MCP6V81T-E/OT | Higher offset drift (0.25 µV/°C), no integrated EMI filter, but lower cost and same SC70-5 package. | Acceptable for consumer-grade temperature monitors where EMI immunity is not critical. | Choose MCP6V81T-E/OT only if budget constraints outweigh need for medical-grade EMI robustness and drift performance. |
Compared with OPA378AIDCKR, OPA333AIDCKR trades bandwidth and noise for extreme low power, while MCP6V81T-E/OT sacrifices EMI filtering and drift spec for cost - neither offers drop-in replacement due to differing noise profiles and filtering architecture.
Availability
OPA378AIDCKR is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and sensor signal conditioning requiring stable component supply across automotive, industrial, and healthcare design cycles.
Supply support for OPA378AIDCKR 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 over 50 years of innovation in precision signal chain components.
The OPA378AIDCKR belongs to TI's Zerø-Drift Series, designed specifically for high-accuracy, low-power sensor interfaces in unregulated battery-powered systems - emphasizing long-term offset stability, EMI resilience, and rail-to-rail operation.
FAQ
What is the maximum operating temperature range for the OPA378AIDCKR?
The OPA378AIDCKR is fully specified from –40°C to +125°C and rated for continuous operation up to +150°C junction temperature. Its guaranteed performance over this extended industrial range makes it suitable for under-hood automotive sensors and sterilizable medical probes where thermal stress is critical. The OPA378AIDCKR maintains 20 µV max offset and 0.1 µV/°C drift across the full –40°C to +125°C ambient range.
Does the OPA378AIDCKR require external capacitors for stability?
No, the OPA378AIDCKR is unity-gain stable and does not require external compensation capacitors. Its internal architecture ensures stable operation with capacitive loads up to 100 pF, as verified in Figure 18 of the SBOS417D datasheet. However, a 0.1 µF ceramic bypass capacitor placed close to the V+ and V− pins is mandatory to suppress supply noise and ensure optimal PSRR performance in the OPA378AIDCKR.
Can the OPA378AIDCKR drive an ADC input directly?
Yes, the OPA378AIDCKR is explicitly designed to drive SAR and delta-sigma ADCs directly. Its rail-to-rail output swings within 8 mV of both supply rails at 10 kΩ load, and its low 0.4 µVPP 0.1–10 Hz noise preserves DC accuracy. When driving the ADS1115 or similar 16-bit converters, the OPA378AIDCKR achieves >15.5 ENOB without external filtering or buffering stages.
How does the EMI filtering in the OPA378AIDCKR improve system reliability?
The OPA378AIDCKR integrates a 25 MHz low-pass EMI filter on both inputs using 1.5 kΩ series resistors and parasitic capacitance, providing 29 dB attenuation at 800 MHz. This prevents RF rectification-induced offset shifts in noisy environments - such as near GSM transceivers or switch-mode power supplies - ensuring consistent OPA378AIDCKR output accuracy without additional external R-C filtering or shielding.
Is the OPA378AIDCKR compatible with single-cell lithium batteries?
Yes, the OPA378AIDCKR operates across 2.2 V to 5.5 V, covering the full discharge curve of single-cell Li-ion (3.0 V–4.2 V) and LiFePO₄ (2.5 V–3.65 V) batteries. Its 125 µA quiescent current and 1.5 µV/V PSRR allow direct connection without regulation - enabling simplified power architecture in OPA378AIDCKR-based glucose meters and handheld gas analyzers where board space and efficiency are constrained.
OPA378AIDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- SC-70-5
OPA378AIDCKR FAQ
1.How can I place an order for OPA378AIDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA378AIDCKR 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 OPA378AIDCKR reliable?
The price and inventory of OPA378AIDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA378AIDCKR is usually 5 days.
3.What payment methods are accepted for OPA378AIDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA378AIDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA378AIDCKR?
OPA378AIDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA378AIDCKR 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 OPA378AIDCKR?
For technical support, including OPA378AIDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA378AIDCKR requirements.
6.How does Aetrix verify that OPA378AIDCKR is sourced from the original manufacturer or authorized distributors?
All OPA378AIDCKR 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 OPA378AIDCKR meets industry standards.
7.What is the process for return or replacement of OPA378AIDCKR?
All OPA378AIDCKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA378AIDCKR, 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 OPA378AIDCKR part is unused and in its original packaging.
Return procedure for OPA378AIDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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