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Texas Instruments OPA369AIDCKT
- Part No.:
- OPA369AIDCKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA369AIDCKT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:474
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Product details
Overview
OPA369AIDCKT from Texas Instruments is a single, ultra-low-power, rail-to-rail input/output operational amplifier optimized for 1.8V–5.5V battery-powered systems. It delivers 250µV max offset voltage, 700nA quiescent current, 12kHz gain-bandwidth, 114dB CMRR, and zero-crossover architecture to eliminate input-stage distortion in low-voltage sensing. It is used in precision battery monitoring circuits where supply headroom is constrained.
For engineers reviewing the OPA369AIDCKT datasheet, OPA369AIDCKT pinout, OPA369AIDCKT application, or OPA369AIDCKT equivalent, key selection criteria include sub-1µA IQ, true rail-to-rail I/O at 1.8V, 0.4µV/°C offset drift, SC70-5 package footprint, and compatibility with high-impedance sensor interfaces requiring minimal loading.
Technical Context
The OPA369AIDCKT employs a zero-crossover input stage that eliminates the dead zone and associated crossover distortion typical of complementary-input rail-to-rail op amps below 3V. Its CMOS input stage draws only 10pA bias current and supports common-mode input voltages from V– to V+, enabling direct interfacing with sensors operating near supply rails.
It features a unity-gain-stable, internally compensated architecture with 12kHz GBW and 0.005V/µs slew rate-optimized for DC-coupled, low-frequency signal conditioning rather than AC amplification. The device maintains 134dB open-loop gain (AOL) and 106dB PSRR across its full 1.8V–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.8V to 5.5V - enables operation directly from single-cell Li-ion, alkaline, or coin-cell batteries without regulation. |
| Quiescent Current | 0.8µA typ - reduces system standby power by >90% vs. conventional rail-to-rail op amps, extending battery life in always-on sensors. |
| Input Offset Voltage | 250µV max - ensures <0.025% error in 10mV full-scale medical or industrial sensor outputs without trimming. |
| Offset Drift | 0.4µV/°C typ - limits temperature-induced error to <4µV over –40°C to +85°C, critical for uncalibrated portable instrumentation. |
| Gain-Bandwidth Product | 12kHz - sufficient for DC–100Hz biosignal amplification (ECG, pulse oximetry) and slow thermistor/RTD conditioning. |
| CMRR | 114dB min - rejects >5M:1 common-mode noise in bridge-based pressure or load-cell interfaces. |
| Output Swing | 10mV from rail (RL = 100kΩ) - preserves dynamic range when driving ADC reference buffers or low-VDD comparators. |
Pinout & Package
OPA369AIDCKT is housed in a 5-pin SC70 package (JEDEC MO-203, TI drawing DCK), measuring 2.2mm × 1.35mm × 1.1mm, with pin 1 marked by a dot in the top-left corner. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–IN) | High-impedance CMOS node; accepts signals from V– to V+; requires current limiting if driven beyond rails. |
| 2 | Non-Inverting Input (+IN) | Identical to Pin 1; differential pair input with 10pA bias current and 10¹³Ω input impedance. |
| 3 | V– (Ground/–VS) | Power return path; must be low-impedance; bypass capacitor (0.1µF) required between Pins 3 and 5. |
| 4 | Output (OUT) | Rail-to-rail output capable of sourcing/sinking ±10mA; drives 100kΩ loads within 10mV of supply rails. |
| 5 | V+ (+VS) | Positive supply input; operates down to 1.8V; PSRR of 106dB minimizes supply ripple coupling into signal path. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-Crossover Input Stage | Eliminates input transition distortion at rail crossings, enabling accurate DC gain and linearity in low-voltage (<3V) sensor front-ends. |
| True Rail-to-Rail I/O | Supports input common-mode range from V– to V+ and output swing to within 10mV of either rail-maximizing usable dynamic range in 1.8V systems. |
| NanoPower Operation | 0.8µA quiescent current allows continuous operation on nanoampere-level energy harvesters or multi-year coin-cell deployments. |
| Low-Drift Precision | 0.4µV/°C offset drift and 114dB CMRR maintain accuracy across temperature without calibration in portable diagnostic devices. |
| SC70-5 Footprint | 2.2mm × 1.35mm body size saves >60% board area vs. SOT-23-5, enabling miniaturized wearables and implantable sensor nodes. |
Applications
| Battery Voltage Monitoring | Medical Sensor Signal Conditioning |
|---|---|
Use Scenario: Real-time detection of lithium coin-cell depletion in glucose meters or hearing aids using a resistive divider and reference comparator. IC Role / Device Role / Timing Role: Precision comparator front-end amplifier providing rail-to-rail input swing and sub-µA bias to avoid loading the divider network. Use Value: Enables accurate 2.0V trip-point detection with <50mV hysteresis while consuming <1µA total system current. | Use Scenario: Amplifying microvolt-level EEG or ECG signals from dry electrodes in ambulatory monitors. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier gain block with ultra-low input bias (10pA) to prevent electrode polarization errors. Use Value: Preserves signal integrity at <100Hz bandwidth with <4µV total offset drift over clinical operating temperature range. |
| Portable Gas Detector Front-End | Low-Power RTD Temperature Sensing |
Use Scenario: Conditioning output of electrochemical gas sensors with high source impedance (>100MΩ) and low output current (nA). IC Role / Device Role / Timing Role: Transimpedance amplifier with FET-input-equivalent bias current and rail-to-rail output for ADC interface. Use Value: Achieves <1pA input leakage and 12-bit effective resolution without active guarding or guard rings. | Use Scenario: Linearizing and amplifying resistance changes from Pt100 RTDs in handheld thermal imagers or HVAC sensors. IC Role / Device Role / Timing Role: Constant-current excitation buffer and ratiometric measurement amplifier with matched CMRR/PSRR. Use Value: Delivers ±0.1°C accuracy from –20°C to +70°C using only passive component matching, no software calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1540CS5#TRMPBF | Higher IQ (1.1µA), wider supply (2.7V–10V), no zero-crossover architecture; 10µV offset but higher drift (2µV/°C). | Requires ≥2.7V supply; unsuitable for 1.8V coin-cell systems; better for higher-precision, higher-VDD industrial sensors. | Select only if supply ≥2.7V and offset drift tolerance >2µV/°C; not drop-in for OPA369AIDCKT's 1.8V operation. |
| MAX40007AXT+T | Lower IQ (500nA), same 1.8V min, but lower CMRR (100dB) and no zero-crossover; 150µV offset, 1.5µV/°C drift. | Acceptable for cost-sensitive consumer wearables where <0.1% linearity error is tolerable; lacks OPA369AIDCKT's distortion-free rail crossing. | Choose when ultra-low IQ is primary constraint and distortion-free DC performance is secondary; verify layout stability per MAX40007 layout guidelines. |
Compared with LTC1540CS5#TRMPBF and MAX40007AXT+T, OPA369AIDCKT uniquely combines 1.8V operation, zero-crossover linearity, and 0.4µV/°C drift-making it the only option for calibrated, battery-constrained medical front-ends demanding sub-0.025% DC accuracy.
Availability
OPA369AIDCKT is available at Aetrix Electronics and suitable for battery-powered instruments, portable medical devices, and low-power sensor signal conditioning requiring stable component supply across long-lifecycle OEM programs.
Supply support for OPA369AIDCKT 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 design.
The OPA369 family was engineered specifically for ultra-low-power, rail-to-rail signal conditioning in battery-operated medical, industrial, and portable instrumentation-prioritizing DC precision, supply flexibility, and miniature packaging.
FAQ
What is the maximum operating temperature range for the OPA369AIDCKT?
The OPA369AIDCKT is specified for operation from –40°C to +85°C (industrial grade), with an extended survival range up to +125°C. All electrical parameters-including offset voltage, CMRR, and quiescent current-are guaranteed across the full –40°C to +85°C range per the SBOS414B datasheet.
Does the OPA369AIDCKT require external compensation for unity-gain stability?
No, the OPA369AIDCKT is internally compensated and unity-gain stable. It does not require external capacitors or feedback networks to ensure stability in standard configurations such as voltage followers or non-inverting amplifiers with G ≥ 1.
Can the OPA369AIDCKT drive capacitive loads, and what is the recommended limit?
Yes, the OPA369AIDCKT can drive moderate capacitive loads. Per Figure 20 in the datasheet, small-signal overshoot remains <20% with up to 20pF load capacitance in G = +1 configuration. For loads >20pF, a series isolation resistor (e.g., 10Ω–100Ω) at the output is recommended to maintain phase margin.
Is the OPA369AIDCKT pin-compatible with other SC70-5 op amps like the OPA333 or TLV2369?
No, the OPA369AIDCKT has a unique pinout: Pin 1 = –IN, Pin 2 = +IN, Pin 3 = V–, Pin 4 = OUT, Pin 5 = V+. This differs from TLV2369 (Pin 1 = OUT, Pin 2 = –IN, Pin 3 = +IN, Pin 4 = V–, Pin 5 = V+) and OPA333 (Pin 1 = NC, Pin 2 = –IN, Pin 3 = +IN, Pin 4 = V–, Pin 5 = V+). PCB redesign is required for substitution.
How does the zero-crossover feature improve performance in low-voltage applications?
The zero-crossover feature eliminates the input-stage transition region found in conventional rail-to-rail op amps, preventing distortion and gain nonlinearity when the common-mode input voltage crosses mid-supply-especially critical below 3V. In the OPA369AIDCKT, this ensures monotonic, distortion-free amplification across the full V– to V+ input range at 1.8V operation.
OPA369AIDCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.005V/µs
- Gain Bandwidth Product:
- 12 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 800nA
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
OPA369AIDCKT FAQ
1.How can I place an order for OPA369AIDCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA369AIDCKT 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 OPA369AIDCKT reliable?
The price and inventory of OPA369AIDCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA369AIDCKT is usually 5 days.
3.What payment methods are accepted for OPA369AIDCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA369AIDCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA369AIDCKT?
OPA369AIDCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA369AIDCKT 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 OPA369AIDCKT?
For technical support, including OPA369AIDCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA369AIDCKT requirements.
6.How does Aetrix verify that OPA369AIDCKT is sourced from the original manufacturer or authorized distributors?
All OPA369AIDCKT 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 OPA369AIDCKT meets industry standards.
7.What is the process for return or replacement of OPA369AIDCKT?
All OPA369AIDCKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA369AIDCKT, 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 OPA369AIDCKT part is unused and in its original packaging.
Return procedure for OPA369AIDCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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