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Texas Instruments TLV522DGKT
- Part No.:
- TLV522DGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TLV522DGKT.pdf
- Description:
- IC CMOS 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,070
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Product details
Overview
TLV522DGKT from Texas Instruments is a dual nanopower rail-to-rail input/output (RRIO) CMOS operational amplifier optimized for ultra-low-power sensing front-ends. It delivers 8 kHz gain-bandwidth at 500 nA per channel, 4 mV max offset voltage, and operates from 1.7 V to 5.5 V - enabling precision signal conditioning in oxygen sensor analog stages, battery-powered gas detectors, and energy-harvested remote nodes.
For engineers reviewing the TLV522DGKT datasheet, TLV522DGKT pinout, TLV522DGKT application, or TLV522DGKT equivalent, key selection criteria include its sub-1 µA quiescent current, rail-to-rail operation down to 1.7 V, 1 pA input bias current for high-impedance transducer interfaces, and guaranteed performance across –40°C to 125°C industrial temperature range.
Technical Context
The TLV522DGKT integrates two independent CMOS op-amp channels with complementary differential input pairs enabling true rail-to-rail input operation - including a 400 mV transition region where both N- and P-channel pairs are active. Its unity-gain stable architecture supports direct use in buffer, transimpedance, and filter configurations without external compensation.
Designed specifically for low-leakage, high-impedance signal chains, the device features 10¹³ Ω || 2.5 pF input impedance and EMI-hardened topology to suppress interference from mobile phones, WiFi, and RFID sources - critical for reliable operation in unshielded portable and IoT sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.7 V to 5.5 V - enables direct interface with single-cell Li-ion, CR2032, or energy-harvesting sources without regulation. |
| Quiescent Current | 500 nA per channel - allows multi-year operation on coin cells (e.g., 9.5 years on CR2032 for 5-channel 60 Hz notch filters). |
| Gain-Bandwidth Product | 8 kHz - sufficient for DC–100 Hz sensor signals (e.g., electrochemical O₂, CO, NO₂) with margin for anti-alias filtering. |
| Input Offset Voltage | ±1 mV typical, 4 mV max - ensures <10 µV error in 10 MΩ transimpedance gains used in ppm-level gas detection. |
| Input Bias Current | 1 pA - minimizes voltage error across >100 MΩ feedback resistors in photodiode or electrochemical sensor interfaces. |
| Rail-to-Rail I/O | Input common-mode extends to V− and V+, output swings within 3 mV of rails at 3.3 V - maximizes dynamic range in low-voltage systems. |
| Temperature Range | –40°C to 125°C - qualified for industrial, automotive cabin, and building automation environments. |
Pinout & Package
TLV522DGKT is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm with exposed thermal pad connected internally to V−. The compact footprint supports high-density PCB layouts in space-constrained sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Channel A output | Drives downstream ADC reference or filter stage; rail-to-rail swing preserves full-scale resolution. |
| 2 (–IN A) | Channel A inverting input | Accepts feedback in transimpedance configuration; 1 pA bias current avoids error in >10 MΩ feedback networks. |
| 3 (+IN A) | Channel A non-inverting input | Connects to sensor electrode or reference voltage; rail-to-rail common-mode enables direct connection to V− or V+. |
| 4 (V−) | Negative supply | Reference node for dual-supply operation or ground in single-supply; tied to exposed die attach pad for thermal stability. |
| 5 (+IN B) | Channel B non-inverting input | Supports dual-sensor monitoring (e.g., O₂ + humidity) or reference channel in ratiometric designs. |
| 6 (–IN B) | Channel B inverting input | Enables independent second signal path without cross-talk; identical electrical specs to Channel A. |
| 7 (OUT B) | Channel B output | Provides isolated second analog output; supports redundancy or differential measurement topologies. |
| 8 (V+) | Positive supply | Bypassed with 10 nF ceramic capacitor near pin to suppress noise coupling into sensitive input stages. |
Key Features
| Feature | Design Value |
|---|---|
| EMI-hardened architecture | Reduces RF-induced output errors from mobile/WiFi/RFID sources - validated per IEC 61000-4-3, critical for medical and safety-critical sensors. |
| Ultra-low input bias current (1 pA) | Enables stable operation with >100 MΩ feedback resistors in electrochemical oxygen sensor amplifiers without drift or saturation. |
| CMOS input stage | Eliminates leakage-path errors in high-impedance pH, gas, and photodiode circuits - unlike bipolar-input op-amps requiring guard rings. |
| Low TCVos (1.5 µV/°C) | Minimizes temperature-induced offset drift in unregulated battery-powered systems operating across –40°C to 125°C. |
| Unity-gain stable | Permits direct use as voltage follower or transimpedance amplifier without external compensation components - reduces BOM count and layout area. |
Applications
| Oxygen Sensor Front-End | Battery-Powered Gas Detector |
|---|---|
|
Use Scenario: Amplifying nanoamp-level current from electrochemical O₂ sensor electrodes in portable analyzers or HVAC air quality monitors. IC Role / Device Role / Timing Role: Transimpedance amplifier converting sensor current to voltage with minimal input loading and thermal drift. Use Value: 1 pA input bias current prevents baseline shift; 500 nA quiescent current extends CR2032 battery life beyond 5 years in continuous monitoring mode. |
Use Scenario: Signal conditioning for CO, NO₂, or H₂S sensors in handheld industrial safety meters powered by AA batteries. IC Role / Device Role / Timing Role: Dual-channel amplifier providing simultaneous sensor signal and reference channel buffering with matched drift. Use Value: Rail-to-rail I/O maintains >98% dynamic range at 2.0 V end-of-life battery voltage; 125°C rating supports operation in hot vehicle cabins. |
| Energy-Harvested Wireless Node | PIR-Based Occupancy Sensor |
|
Use Scenario: Analog front-end for solar- or thermal-harvested wireless sensor nodes transmitting air quality data via LoRaWAN or NB-IoT. IC Role / Device Role / Timing Role: Low-power signal amplifier and 60 Hz notch filter driver in always-on wake-up circuitry. Use Value: 8 kHz GBW supports precise 60 Hz rejection while consuming only 900 nA total for dual-channel filter - enabling >10-year deployment. |
Use Scenario: Amplifying microvolt-level pyroelectric signals in battery-operated smart lighting controls and security systems. IC Role / Device Role / Timing Role: High-gain, low-noise preamplifier with AC-coupled input to reject DC drift and power supply ripple. Use Value: 300 nV/√Hz input voltage noise and 1.5 µV/°C TCVos ensure reliable motion detection across temperature gradients without false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanopower operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LPV821DRX | Single-channel, 650 nA IQ, 4.5 kHz GBW, same 1.7–5.5 V range and 1 pA IB. | Lacks dual-channel integration; requires two devices for stereo or reference-channel use. | Choose when board space permits discrete channel routing and lower cost per channel is prioritized over integration. |
| TPS62745DSSR | Not an op-amp - buck converter with integrated LDO; incompatible function. | Cannot replace TLV522DGKT in analog signal path; serves power management only. | Exclude from op-amp replacement analysis; verify functional category before cross-reference. |
Compared with LPV821DRX and TPS62745DSSR, TLV522DGKT uniquely combines dual-channel operation, 8 kHz bandwidth, and 500 nA IQ in a single 3×3 mm VSSOP - making it optimal for space- and power-constrained dual-sensor systems where channel matching and layout simplicity are critical.
Availability
TLV522DGKT is available at Aetrix Electronics and suitable for oxygen sensor front-ends, battery-powered gas detectors, and energy-harvested wireless nodes requiring stable component supply across extended product lifecycles.
Supply support for TLV522DGKT 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 chain solutions.
The TLV522DGKT belongs to TI's nanopower op-amp family designed explicitly for battery- and energy-harvested sensor systems - emphasizing ultra-low IQ, rail-to-rail operation, and robustness in real-world EMI environments.
FAQ
What is the maximum capacitive load the TLV522DGKT can drive without oscillation?
The TLV522DGKT is unity-gain stable but becomes sensitive to capacitive loads above 50 pF. When driving >50 pF (e.g., cables, ADC inputs, or MUXs), a series isolation resistor (RISO) of 10–100 Ω must be placed between the output pin and the load. This isolates the capacitance from the amplifier's output impedance, restoring phase margin and preventing peaking or oscillation - as confirmed in TI's Application Report SBOA112.
Does the TLV522DGKT support true single-supply operation with input signals extending to ground?
Yes. The TLV522DGKT features rail-to-rail input with common-mode range extending to V− (ground in single-supply configurations). Its complementary input stage allows operation with inputs at 0 V, making it suitable for direct interfacing with grounded electrochemical sensors or photodiodes - verified across –40°C to 125°C per Section 7.4.1 of the SNOSD27 datasheet.
Can the TLV522DGKT be used in transimpedance amplifier (TIA) configurations for oxygen sensors?
Yes. With 1 pA input bias current, 500 nA quiescent current, and rail-to-rail output swing, the TLV522DGKT is explicitly validated for TIA use in electrochemical gas sensors. TI's AN-1803 and SNOA514 confirm its suitability for O₂, CO, and NO₂ sensors using feedback resistors up to 100 MΩ - where low IB prevents output saturation and drift.
What is the recommended bypassing scheme for the TLV522DGKT power pins?
Place a 10 nF low-ESR ceramic capacitor between V+ and V− as close as possible to pins 8 and 4. For single-supply operation, connect V− to system ground and place the capacitor directly across those pins. Avoid shared traces - the capacitor must form a low-inductance loop with the IC's supply pins to suppress high-frequency noise coupling into the input stage.
How does the TLV522DGKT handle EMI in noisy environments like industrial IoT gateways?
The TLV522DGKT incorporates on-die EMI hardening circuitry that attenuates RF interference from mobile phones, WiFi, and RFID readers - reducing output perturbation by >20 dB compared to standard op-amps. This is validated per IEC 61000-4-3 testing and documented in TI's SBOA209 application note, ensuring reliable operation in unshielded edge-node deployments.
TLV522DGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.0037V/µs
- Gain Bandwidth Product:
- 8 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 500nA (x2 Channels)
- Current - Output / Channel:
- 5 mA
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
TLV522DGKT FAQ
1.How can I place an order for TLV522DGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV522DGKT 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 TLV522DGKT reliable?
The price and inventory of TLV522DGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV522DGKT is usually 5 days.
3.What payment methods are accepted for TLV522DGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV522DGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV522DGKT?
TLV522DGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV522DGKT 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 TLV522DGKT?
For technical support, including TLV522DGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV522DGKT requirements.
6.How does Aetrix verify that TLV522DGKT is sourced from the original manufacturer or authorized distributors?
All TLV522DGKT 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 TLV522DGKT meets industry standards.
7.What is the process for return or replacement of TLV522DGKT?
All TLV522DGKT units undergo pre-shipment inspection (PSI). If there is an issue with TLV522DGKT, 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 TLV522DGKT part is unused and in its original packaging.
Return procedure for TLV522DGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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