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Texas Instruments OPA378AIDCKT
- Part No.:
- OPA378AIDCKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA378AIDCKT.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,317
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Product details
Overview
OPA378AIDCKT from Texas Instruments is a single-channel, rail-to-rail input/output, zero-drift precision operational amplifier optimized for low-noise, low-power, single-supply sensor signal conditioning. It delivers 20 µV max input offset voltage, 0.1 µV/°C offset drift, 20 nV/√Hz voltage noise density at 1 kHz, 900 kHz gain-bandwidth, and 125 µA quiescent current - enabling high-accuracy measurements in battery-powered medical and industrial instrumentation.
For engineers reviewing the OPA378AIDCKT datasheet, OPA378AIDCKT pinout, OPA378AIDCKT application, or OPA378AIDCKT equivalent, key selection criteria include its flicker-noise-free architecture, EMI-hardened SC70-5 package, ±10 mA input current tolerance with rail-exceeding capability, and guaranteed operation from –40°C to +125°C in unregulated 2.2 V to 5.5 V supplies.
Technical Context
The OPA378AIDCKT 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.
This architecture enables simultaneous optimization of DC precision (20 µV VOS, 0.1 µV/°C drift), AC performance (900 kHz GBW, 0.4 V/µs slew rate), and ultra-low power (125 µA IQ), making it suitable for driving 16-bit ADCs without degrading differential linearity in portable measurement systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 20 µV max - ensures ≤0.002% error in 1 V full-scale sensor outputs without calibration. |
| Offset Drift | 0.1 µV/°C max - maintains <1 µV total drift over 100°C ambient range, critical for thermocouple or strain gauge interfaces. |
| Voltage Noise Density | 20 nV/√Hz at 1 kHz - supports sub-µV signal amplification in low-bandwidth sensor front-ends (e.g., thermopiles). |
| Gain-Bandwidth Product | 900 kHz - enables stable closed-loop gain ≥10 up to ~90 kHz, sufficient for ECG and oxygen metering bandwidths. |
| Quiescent Current | 125 µA typical - allows continuous operation >1 year on a single CR2032 coin cell in handheld glucose meters. |
| Rail-to-Rail I/O | Input extends 50 mV beyond rails; output swings within 6 mV of rails at 10 kΩ load - maximizes dynamic range in 3.3 V or lower single-supply systems. |
| Supply Range | 2.2 V to 5.5 V - operates directly from unregulated alkaline, Li-ion, or coin-cell sources without LDO overhead. |
Pinout & Package
OPA378AIDCKT is packaged in SC70-5 (DCK), a 1.25 mm × 1.65 mm surface-mount package with 0.65 mm pitch. This micro-size footprint supports high-density PCB layouts in space-constrained portable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V–) | Negative supply rail | Connects to system ground or negative rail; supports common-mode input down to V– – 0.05 V. |
| 2 (+In) | Non-inverting input | High-impedance node (≥1013 Ω); accepts signals up to V– – 0.3 V or V+ + 0.3 V with current limiting. |
| 3 (–In) | Inverting input | Differential input terminal; internal EMI filter reduces RF rectification effects above 25 MHz. |
| 4 (Out) | Amplifier output | Rail-to-rail capable; drives 10 kΩ loads with ≤8 mV headroom at temperature extremes. |
| 5 (V+) | Positive supply rail | Accepts 2.2 V to 5.5 V; PSRR of 1.5 µV/V minimizes battery voltage ripple coupling into output. |
Key Features
| Feature | Design Value |
|---|---|
| Flicker-noise-free architecture | Zero 1/f noise component enables stable DC-coupled amplification of µV-level thermocouple or bridge outputs. |
| EMI-hardened input stage | Integrated 25 MHz low-pass filter suppresses RF interference from Bluetooth/WiFi modules in handheld test equipment. |
| Ultra-low quiescent current | 125 µA per amplifier allows always-on sensor biasing in battery-powered weigh scales without compromising runtime. |
| Rail-to-rail input common-mode range | Operates with inputs 50 mV beyond supply rails - simplifies interfacing to sensors with floating or wide-output swing. |
| Guaranteed operation to +125°C | Validated performance across –40°C to +125°C enables use in automotive cabin sensors and industrial motor controllers. |
Applications
| Portable Medical Devices | Weigh Scales |
|---|---|
Use Scenario: Signal conditioning for electrochemical glucose sensors in handheld meters requiring stable baseline and low drift over 10-hour shelf life. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting pA-level sensor current to voltage with minimal offset-induced zero-error. Use Value: 20 µV VOS and 0.1 µV/°C drift ensure <0.5% full-scale error across operating temperature, meeting ISO 15197 accuracy requirements. | Use Scenario: Amplifying mV-level output from load-cell bridges in consumer kitchen scales powered by two AA batteries. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail instrumentation front-end providing 100× gain before 24-bit sigma-delta ADC. Use Value: 20 nV/√Hz noise density and 900 kHz GBW enable 1 µg resolution at 10 Hz update rate with <1 LSB noise floor. |
| Battery-Powered Instruments | Sensor Signal Conditioning |
Use Scenario: Front-end amplifier in handheld multimeters measuring µA currents via shunt resistors with auto-ranging. IC Role / Device Role / Timing Role: Zero-drift current-sense amplifier with programmable gain, rejecting supply ripple during battery discharge. Use Value: 1.5 µV/V PSRR and 125 µA IQ extend battery life to >500 hours while maintaining 0.1% reading accuracy across 2.2–5.5 V supply range. | Use Scenario: Amplifying thermopile output (10–100 µV) in non-contact infrared thermometers with ambient temperature compensation. IC Role / Device Role / Timing Role: Low-noise, DC-stable amplifier with EMI filtering to reject switching regulator noise in compact PCB layouts. Use Value: Flicker-noise-free design eliminates baseline wander during 1-second measurement cycles, improving repeatability to ±0.1°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDCKT | Same zero-drift architecture but higher 175 µA IQ; 35 nV/√Hz noise; 350 kHz GBW | Better for ultra-low-power sleep modes; less suitable for >50 kHz sensor bandwidths | Select when lowest possible IQ dominates over noise or speed requirements |
| MCP6V81T-E/OT | Microchip zero-drift op-amp; 130 µA IQ; 22 nV/√Hz; 1 MHz GBW; different SC70-5 pinout (V+ and Out swapped) | Requires PCB layout revision; offers slightly higher speed but no EMI filtering | Choose only if redesign accommodates pinout change and EMI immunity is not critical |
Compared with OPA333AIDCKT and MCP6V81T-E/OT, the OPA378AIDCKT uniquely balances 900 kHz bandwidth, 20 nV/√Hz noise, and integrated EMI filtering in a standard SC70-5 footprint - making it optimal for portable medical and industrial sensors where signal integrity, speed, and size are jointly constrained.
Availability
OPA378AIDCKT is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instruments, and sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA378AIDCKT 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs for industrial, automotive, and personal electronics markets.
The OPA378AIDCKT belongs to TI's Zerø-Drift Series, designed specifically for high-accuracy, low-power, single-supply applications including portable medical diagnostics, precision weighing, and environmental sensing where DC stability and noise performance are critical.
FAQ
What is the maximum supply voltage for OPA378AIDCKT?
The absolute maximum supply voltage for OPA378AIDCKT is +7 V, but the recommended operating range is 2.2 V to 5.5 V. Exceeding +7 V risks permanent damage. Within the specified range, OPA378AIDCKT maintains guaranteed performance including 20 µV offset voltage and 900 kHz gain-bandwidth. Operation at 5.5 V yields optimal PSRR (1.5 µV/V) and output drive capability.
Does OPA378AIDCKT require external capacitors for stability?
No, OPA378AIDCKT 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. However, a 0.1 µF ceramic bypass capacitor placed close to the V+ and V– pins is mandatory to suppress supply noise and maintain PSRR performance, especially in battery-powered systems.
Can OPA378AIDCKT drive an ADC input directly?
Yes, OPA378AIDCKT is optimized to drive SAR and delta-sigma ADCs directly. Its rail-to-rail output swings within 6 mV of the rails at 10 kΩ load, and its low 0.4 V/µs slew rate prevents overshoot into 16-bit+ converters. When paired with a 24-bit ADC like ADS1220, OPA378AIDCKT contributes <0.5 LSB noise floor due to its 20 nV/√Hz density and flicker-noise-free design - preserving effective resolution.
How does the EMI filtering in OPA378AIDCKT improve system robustness?
OPA378AIDCKT integrates a 25 MHz low-pass EMI filter on both inputs, reducing RF rectification effects from 800 MHz cellular or WiFi signals by 29 dB. This prevents DC offset shifts during RF exposure - a critical failure mode in handheld test equipment and clinical devices. Unlike external RC filters, this on-die solution avoids adding thermal EMFs or parasitic capacitance that degrade precision.
Is OPA378AIDCKT compatible with lead-free reflow processes?
Yes, OPA378AIDCKT in SC70-5 (DCK) package is rated for standard lead-free reflow profiles per JEDEC J-STD-020. Its moisture sensitivity level (MSL) is 1, meaning it can be stored indefinitely at ≤30°C/85% RH without baking. The device withstands peak reflow temperatures up to 260°C for 30 seconds, ensuring compatibility with automated SMT assembly lines used in high-volume medical and industrial manufacturing.
OPA378AIDCKT 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
OPA378AIDCKT FAQ
1.How can I place an order for OPA378AIDCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA378AIDCKT 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 OPA378AIDCKT reliable?
The price and inventory of OPA378AIDCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA378AIDCKT is usually 5 days.
3.What payment methods are accepted for OPA378AIDCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA378AIDCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA378AIDCKT?
OPA378AIDCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA378AIDCKT 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 OPA378AIDCKT?
For technical support, including OPA378AIDCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA378AIDCKT requirements.
6.How does Aetrix verify that OPA378AIDCKT is sourced from the original manufacturer or authorized distributors?
All OPA378AIDCKT 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 OPA378AIDCKT meets industry standards.
7.What is the process for return or replacement of OPA378AIDCKT?
All OPA378AIDCKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA378AIDCKT, 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 OPA378AIDCKT part is unused and in its original packaging.
Return procedure for OPA378AIDCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA378AIDCKT Tags
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