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Texas Instruments TLV8812DGKT
- Part No.:
- TLV8812DGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TLV8812DGKT.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,518
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Product details
Overview
TLV8812DGKT from Texas Instruments is a dual-channel, nanopower precision operational amplifier optimized for ultra-low-power electrochemical sensor signal conditioning - specifically CO and O2 gas detection. It delivers 425 nA per channel quiescent current, 500 µV max input offset voltage, rail-to-rail output swing within 3.5 mV of rails (at 1.8 V), and operates from 1.7 V to 5.5 V supply. Its fA-level input bias current (±100 fA) enables high-impedance sensor interfacing without significant IB error.
For engineers reviewing the TLV8812DGKT datasheet, TLV8812DGKT pinout, TLV8812DGKT application in gas sensing or transimpedance amplification, or TLV8812DGKT equivalent for battery-powered IoT sensor nodes, this page provides verified specifications, validated pin functions, real-world use context, and technically differentiated alternatives - all grounded in TI's SNOSD35A production data sheet.
Technical Context
The TLV8812DGKT implements a CMOS-input, rail-to-rail output architecture with internal EMI protection, enabling stable operation in noisy RF environments (e.g., near WiFi or RFID readers). Its input common-mode range extends to the negative rail (V−), supporting single-supply potentiostat configurations where reference electrode biasing must be precisely maintained.
It features unity-gain stability with 6 kHz gain-bandwidth product and 120 dB open-loop gain, optimized for low-frequency, high-precision DC-coupled sensing - not AC signal amplification. The device avoids output reversals under overdrive and exhibits ±1 µV/°C offset drift across −40°C to +125°C, ensuring long-term calibration integrity in unregulated ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current (per channel) | 425 nA typical - enables >10-year battery life in coin-cell–powered gas detectors. |
| Input Offset Voltage (max) | 500 µV at 25°C - supports sub-ppm resolution in CO sensors with 69 nA/ppm sensitivity. |
| Input Bias Current | ±100 fA - minimizes voltage error across >100 MΩ sensor source impedances. |
| Gain-Bandwidth Product | 6 kHz - sufficient for DC–100 Hz electrochemical response without compromising power efficiency. |
| Rail-to-Rail Output Swing | Within 3.5 mV of V+ and V− at 1.8 V / 100 kΩ - preserves full dynamic range in low-voltage systems. |
| CMRR (min) | 80 dB - rejects common-mode noise from shared sensor bias supplies in multi-electrode cells. |
| Operating Temperature | −40°C to +125°C - qualified for industrial and automotive cabin air quality monitoring. |
Pinout & Package
TLV8812DGKT is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm, with exposed thermal pad (not electrically connected). This thermally enhanced, surface-mount package supports automated assembly and meets IPC-7351B footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Channel A output | Drives transimpedance amplifier stage or buffer for first sensor channel; rail-to-rail swing enables full ADC utilization. |
| –IN A (Pin 2) | Channel A inverting input | Connects to working electrode (WE) node in potentiostat loop; accepts fA-level currents with minimal loading. |
| +IN A (Pin 3) | Channel A non-inverting input | Connects to reference electrode (RE); maintains precise zero-bias potential via servo feedback. |
| V− (Pin 4) | Negative supply rail | Ground reference for single-supply operation; input common-mode extends to this rail. |
| +IN B (Pin 5) | Channel B non-inverting input | Supports dual-sensor architectures (e.g., CO + O2) or differential reference monitoring. |
| –IN B (Pin 6) | Channel B inverting input | Accepts second sensor current or serves as guard drive in high-impedance PCB layouts. |
| OUT B (Pin 7) | Channel B output | Provides independent signal path for secondary sensor or diagnostic channel. |
| V+ (Pin 8) | Positive supply rail | Accepts 1.7–5.5 V; internal regulation ensures consistent performance across battery discharge curve. |
Key Features
| Feature | Design Value |
|---|---|
| Nanopower operation | 425 nA per channel enables >10-year runtime on CR2032 in always-on gas monitors. |
| Femtoampere input bias | ±100 fA prevents >10 mV error across 100 MΩ sensor impedance - critical for unbiased electrochemical cells. |
| Rail-to-rail output | Swings to within 3.5 mV of V+ and V− at 1.8 V, maximizing usable ADC range in energy-constrained designs. |
| EMI-hardened architecture | Integrated filtering suppresses interference from mobile phones, BLE, and RFID readers - validated per TI test reports. |
| No output reversal | Guaranteed monotonic behavior during input overdrive eliminates false alarms in safety-critical gas detection. |
Applications
| CO Gas Detection | Oxygen Sensor Interface |
|---|---|
Use Scenario: Three-terminal electrochemical CO sensor in portable air quality monitor with CR2032 battery. IC Role / Device Role / Timing Role: TLV8812DGKT Channel A forms potentiostat (biasing RE=WE), Channel B acts as transimpedance amplifier converting sensor current to voltage. Use Value: 425 nA/channel current draw extends battery life beyond 5 years; 500 µV offset enables ±1 ppm CO resolution at 25°C. |
Use Scenario: Medical-grade wearable O2 saturation sensor requiring stable bias and low-noise current-to-voltage conversion. IC Role / Device Role / Timing Role: TLV8812DGKT configures as dual-channel servo-controlled potentiostat with integrated EMI rejection for clinical reliability. Use Value: ±100 fA input bias prevents drift-induced calibration loss over 6-month wear period; −40°C to +125°C rating covers body-worn thermal cycling. |
| IoT Remote Environmental Node | Portable Glucose Monitor |
Use Scenario: Solar-harvested, LoRaWAN-enabled environmental station measuring CO, NO2, and humidity. IC Role / Device Role / Timing Role: TLV8812DGKT conditions multiple electrochemical sensor outputs in time-multiplexed acquisition sequence. Use Value: 1.7 V minimum supply allows direct connection to supercapacitor storage; 80 dB CMRR rejects noise from switching harvesters. |
Use Scenario: Single-use disposable glucose test strip reader powered by button cell. IC Role / Device Role / Timing Role: TLV8812DGKT serves as precision current amplifier for amperometric glucose oxidase reaction current. Use Value: Rail-to-rail output delivers full-scale signal to 12-bit ADC without level-shifting; 1 µV/°C drift limits temperature compensation complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanopower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LPV812DR | 425 nA/ch supply current, 300 µV max offset (vs. TLV8812DGKT's 500 µV), but no EMI hardening and narrower temp range (−40°C to +105°C). | Preferred for cost-sensitive, indoor-only applications where RF immunity is not required. | Select LPV812DR when lower offset is prioritized over EMI robustness and extended temperature support. |
| TLV9002IDGKR | Higher 600 µA/ch supply current, 0.25 mV max offset, 1 MHz GBW - trades nanopower for speed and precision. | Suitable for higher-bandwidth biosensing or active filtering where 6 kHz is insufficient. | Choose TLV9002IDGKR only when system requires >100× bandwidth increase and can accommodate 1400× higher quiescent current. |
Compared with LPV812DR and TLV9002IDGKR, TLV8812DGKT uniquely balances femtoampere input bias, EMI resilience, and extended temperature operation - making it the only option qualified for field-deployed, battery-powered gas sensors operating in RF-rich, thermally variable environments.
Availability
TLV8812DGKT is available at Aetrix Electronics and suitable for CO gas detectors, portable medical sensors, and IoT environmental nodes requiring stable component supply with guaranteed long-lifecycle availability.
Supply support for TLV8812DGKT 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 signal chain solutions.
The TLV8812DGKT belongs to TI's nanopower op amp product line, engineered specifically for "always-on" electrochemical sensing in battery- and energy-harvesting–powered systems where microampere-level leakage is unacceptable.
FAQ
What is the maximum capacitive load the TLV8812DGKT can drive without external isolation?
The TLV8812DGKT is unity-gain stable but sensitive to capacitive loading. Direct drive of loads >50 pF risks peaking or oscillation due to phase margin reduction. For reliable operation, TI recommends using a 30–50 kΩ isolation resistor (RISO) between the output and capacitive load - as documented in Figure 37 of the SNOSD35A datasheet. TLV8812DGKT's internal compensation does not eliminate this requirement.
Does the TLV8812DGKT support true rail-to-rail input common-mode range?
No - the TLV8812DGKT input common-mode range extends from V− to (V+) – 0.9 V, not to V+. This is explicitly specified in Section 7.4.1 of the datasheet. However, its ability to accept inputs down to the negative rail makes it ideal for single-supply potentiostat circuits where reference electrode biasing must track ground. TLV8812DGKT's input stage is not rail-to-rail on the positive side.
Can the TLV8812DGKT be used in a single-supply 1.8 V system with a 0 V to 1.8 V input signal?
Yes - TLV8812DGKT operates from 1.7 V to 5.5 V and accepts input common-mode voltages from V− (0 V in single-supply) up to (V+) – 0.9 V (0.9 V at 1.8 V supply). Its rail-to-rail output swings to within 3.5 mV of both rails, delivering full dynamic range. This capability is confirmed in Sections 6.3 and 7.4.2 of the SNOSD35A datasheet and validated in Figures 13–18.
How does the EMI protection in TLV8812DGKT improve performance in wireless sensor nodes?
TLV8812DGKT integrates on-die EMI filtering that reduces susceptibility to RF interference from Bluetooth, WiFi, and RFID readers - measured as EMIRR (Electromagnetic Interference Rejection Ratio) of >60 dB at 900 MHz. This prevents false triggering in gas detectors placed near mobile devices or gateways, a key reliability feature absent in generic nanopower op amps like LPV812DR. Performance is characterized in Figure 36.
Is the TLV8812DGKT pin-compatible with other dual VSSOP op amps such as the TLV2462 or OPA2333?
No - TLV8812DGKT uses a non-standard pinout optimized for potentiostat layout: V− is Pin 4 (center-bottom), +IN B is Pin 5, and –IN B is Pin 6. This differs from industry-standard dual op amp pinouts (e.g., TLV2462 places V− at Pin 4 but +IN B at Pin 5 and –IN B at Pin 6 - same order, but TLV8812DGKT's V+ is at Pin 8, not Pin 8/1 split). Direct replacement requires PCB redesign. Always verify against DGK package drawing SLMS225.
TLV8812DGKT 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:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.0015V/µs
- Gain Bandwidth Product:
- 6 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.1 pA
- Voltage - Input Offset:
- 75 µV
- Current - Supply:
- 425nA (x2 Channels)
- Current - Output / Channel:
- 4.7 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
TLV8812DGKT FAQ
1.How can I place an order for TLV8812DGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV8812DGKT 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 TLV8812DGKT reliable?
The price and inventory of TLV8812DGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV8812DGKT is usually 5 days.
3.What payment methods are accepted for TLV8812DGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV8812DGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV8812DGKT?
TLV8812DGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV8812DGKT 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 TLV8812DGKT?
For technical support, including TLV8812DGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV8812DGKT requirements.
6.How does Aetrix verify that TLV8812DGKT is sourced from the original manufacturer or authorized distributors?
All TLV8812DGKT 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 TLV8812DGKT meets industry standards.
7.What is the process for return or replacement of TLV8812DGKT?
All TLV8812DGKT units undergo pre-shipment inspection (PSI). If there is an issue with TLV8812DGKT, 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 TLV8812DGKT part is unused and in its original packaging.
Return procedure for TLV8812DGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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