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Texas Instruments TLV1821DBVR
- Part No.:
- TLV1821DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLV1821DBVR.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,478
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Product details
Overview
TLV1821DBVR from Texas Instruments is a single-channel, 40V rail-to-rail input comparator with open-drain output, 5 μA quiescent current per channel, 420 ns typical propagation delay at 12 V, and Power-On Reset (POR) for deterministic startup-used in motor drive voltage monitoring and factory automation threshold detection.
For engineers reviewing the TLV1821DBVR datasheet, TLV1821DBVR pinout, TLV1821DBVR application, or TLV1821DBVR equivalent, this page delivers verified electrical specs, package-validated pin functions, thermal performance data, functional safety documentation status, and real-world implementation guidance for high-voltage industrial sensing.
Technical Context
The TLV1821DBVR implements an open-drain output stage with sink-only capability, enabling independent pull-up to voltages up to 40 V regardless of its own 2.4–40 V supply range. Its rail-to-rail input operates from (V−) − 0.2 V to (V+) + 0.2 V, supporting wide common-mode sensing in battery-powered and industrial systems.
An integrated Power-On Reset circuit holds the output in a known state for ≤200 μs during supply ramp-up or ramp-down, preventing false triggering. Input bias current is 150 fA at 25 °C, and input offset voltage is ±0.5 mV (typ), enabling precision level detection without external trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.4 V to 40 V - supports direct connection to 24 V industrial rails and 36 V battery systems without regulation. |
| Quiescent Current | 5 μA per channel - enables always-on monitoring in energy-constrained applications like portable test equipment. |
| Propagation Delay | 420 ns (typ) at 100 mV overdrive, 12 V supply - provides fast response for overvoltage/undervoltage fault detection in motor drives. |
| Input Offset Voltage | ±0.5 mV (typ), ±4 mV (max, –40°C to +125°C) - ensures accurate threshold comparison across automotive and industrial temperature ranges. |
| Input Bias Current | 150 fA (typ) - minimizes loading error when used with high-impedance sensor interfaces (e.g., thermistor dividers). |
| Output Type | Open-drain - allows logic-level translation and wired-OR configuration with other comparators or microcontroller GPIOs. |
| Power-On Reset Threshold | 1.7 V - guarantees stable output behavior during brown-out conditions down to sub-2.4 V supply levels. |
Pinout & Package
TLV1821DBVR is packaged in SOT-23-5 (DBV), with 1.60 mm × 2.90 mm body size and standard "North West" pinout orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Open-drain output | Sinks current only; requires external pull-up to define logic-high level-supports 0–40 V pull-up independent of V+. |
| 2: V− | Negative supply | Reference ground for inputs and output clamp; thermal pad (in DSG variants) must be connected directly to V−. |
| 3: IN+ | Non-inverting input | Rail-to-rail capable (V− − 0.2 V to V+ + 0.2 V); 150 fA bias current enables high-Z source interfacing. |
| 4: IN− | Inverting input | Matches IN+ in voltage range and bias characteristics; differential input voltage (VID) must stay within ±40 V absolute max. |
| 5: V+ | Positive supply | Accepts 2.4–40 V; powers internal bias, POR, and output stage; ESD clamps limit input/output excursions to ±0.2 V beyond rails. |
Key Features
| Feature | Design Value |
|---|---|
| 40 V open-drain output compatibility | Enables direct interface to 24 V PLC I/O lines or 36 V battery monitors without level-shifting components. |
| Power-On Reset (POR) | Holds output low for ≤200 μs during power ramp-up/down-eliminates spurious logic transitions in safety-critical startup sequences. |
| Rail-to-rail input stage | Supports full-supply-range sensing (e.g., detecting 0 V to 40 V signals on same device), reducing need for input scaling networks. |
| 2 kV HBM ESD rating | Meets industrial IEC 61000-4-2 Level 2 requirements for board-level robustness in factory automation environments. |
| Functional Safety-Capable | TI provides FIT rate data, failure mode analysis, and safety manual-supports ISO 26262 ASIL-B and IEC 61508 SIL-2 system design. |
Applications
| Motor Drive Overcurrent Detection | Industrial Sensor Threshold Monitoring |
|---|---|
|
Use Scenario: Detecting shunt voltage exceeding 50 mV in a 48 V BLDC motor controller to trigger gate shutdown. IC Role / Device Role / Timing Role: Comparator compares amplified shunt signal against reference; open-drain output drives FPGA interrupt pin via 3.3 V pull-up. Use Value: 420 ns propagation delay enables <1 μs fault response; 40 V output tolerance allows direct connection to 24 V control bus. |
Use Scenario: Monitoring thermistor-based temperature in HVAC duct sensors across –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Compares ratiometric thermistor divider output to fixed reference; POR prevents false alarms during cold start. Use Value: 150 fA input bias avoids measurement error in 100 kΩ+ sensor networks; rail-to-rail input captures full 0–3.3 V range. |
| Appliance Door Interlock Sensing | Factory Automation Limit Switch Interface |
|
Use Scenario: Validating mechanical door latch position in commercial laundry equipment using magnetic reed switch. IC Role / Device Role / Timing Role: Converts reed switch closure into clean logic signal; open-drain output pulled to 5 V MCU I/O. Use Value: 5 μA quiescent current extends battery life in cordless portable appliances; 2 kV ESD withstand protects against user-handling transients. |
Use Scenario: Converting 24 V PNP proximity sensor output to 3.3 V logic for PLC digital input module. IC Role / Device Role / Timing Role: Acts as level translator and noise filter; hysteresis added externally to reject EMI in noisy factory floors. Use Value: 40 V output capability accepts 24 V sensor supply directly; rail-to-rail input handles 0–24 V common-mode swing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1821DCKR | SC-70-5 package (1.25 mm × 2.00 mm); identical electrical specs and pinout; lower thermal resistance (RθJA = 185.6°C/W vs. 203.4°C/W). | Better suited for space-constrained PCBs where footprint reduction is critical; same functional behavior in motor drive feedback loops. | Select TLV1821DCKR when board area is limited and thermal margin above 85°C ambient is sufficient. |
| LMV7219M5X | 36 V max supply; 7 ns propagation delay; push-pull output; no POR; higher 85 μA quiescent current. | Optimized for high-speed analog-to-digital conversion timing, not low-power industrial monitoring. | Choose LMV7219M5X only when nanosecond-level response is required and 5 μA quiescent current is not mandatory. |
Compared with TLV1821DCKR, TLV1821DBVR offers larger SOT-23-5 land pattern ease-of-handling and slightly better thermal dissipation in forced-air environments; versus LMV7219M5X, TLV1821DBVR trades speed for 17× lower power and adds POR and 40 V tolerance-making it superior for battery-backed or safety-critical industrial sensing.
Availability
TLV1821DBVR is available at Aetrix Electronics and suitable for motor drive protection, factory automation I/O conditioning, and appliance safety interlocks requiring stable component supply across extended temperature and voltage ranges.
Supply support for TLV1821DBVR 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, embedded processing, and connectivity technologies, with decades of experience in industrial and automotive-grade precision signal chain solutions.
The TLV1821DBVR belongs to TI's TLV18xx family of micro-power, high-voltage comparators designed specifically for robust, low-power threshold detection in harsh industrial and automotive environments.
FAQ
What is the maximum allowable pull-up voltage on the TLV1821DBVR open-drain output?
The TLV1821DBVR open-drain output supports pull-up voltages up to 40 V, independent of its own supply voltage (V+). This allows direct interfacing with 24 V control buses or 36 V battery monitors without level-shifting circuitry. The absolute maximum rating for output voltage relative to V− is 42 V, but operation above 40 V risks exceeding safe operating area limits under load.
Does TLV1821DBVR include Power-On Reset, and how does it behave?
Yes, TLV1821DBVR includes an integrated Power-On Reset (POR) circuit that holds the open-drain output in a known state (high-impedance, effectively pulled high by external resistor) for up to 200 μs during supply ramp-up or ramp-down. The POR activates when V+ crosses 1.7 V and ensures no false outputs occur before the supply stabilizes-critical for safety-critical motor control and appliance interlock systems.
Can TLV1821DBVR operate from a 2.4 V supply while maintaining full specifications?
Yes, TLV1821DBVR is fully specified from 2.4 V to 40 V supply. At 2.4 V, it maintains rail-to-rail input operation (V− − 0.2 V to V+ + 0.2 V), 5 μA quiescent current, and 900 ns propagation delay (typ, 10 mV overdrive). This makes TLV1821DBVR suitable for ultra-low-voltage battery-powered instrumentation where supply headroom is minimal.
What is the input bias current of TLV1821DBVR, and why does it matter in sensor applications?
TLV1821DBVR has a typical input bias current of 150 fA at 25°C, rising to ±1.2 nA over –40°C to +125°C. This ultra-low value minimizes voltage error when interfacing with high-impedance sources such as thermistors, RTDs, or photodiode amplifiers-ensuring accurate threshold detection without adding series resistance or active buffering.
Is TLV1821DBVR pin-compatible with older TI comparators like TLV7211 or LMC7211?
No-TLV1821DBVR uses the standard SOT-23-5 "North West" pinout (OUT, V−, IN+, IN−, V+), whereas TLV7211/LMC7211 use alternate pinouts (e.g., V+, IN−, IN+, OUT, V−). For drop-in replacement, use TLV1821L variants (e.g., TLV1821LDBVR), which match the legacy pin assignment and enable seamless upgrade of existing designs without PCB revision.
TLV1821DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- Open-Drain, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2.4V ~ 40V
- :
- 3mV @ 12V
- Voltage - Input Offset (Max):
- 0.15pA @ 12V
- Current - Input Bias (Max):
- 30mA
- Current - Output (Typ):
- 7.5µA
- Current - Quiescent (Max):
- 100dB PSRR
- CMRR, PSRR (Typ):
- 450ns (Typ)
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
TLV1821DBVR FAQ
1.How can I place an order for TLV1821DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV1821DBVR 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 TLV1821DBVR reliable?
The price and inventory of TLV1821DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV1821DBVR is usually 5 days.
3.What payment methods are accepted for TLV1821DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV1821DBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV1821DBVR?
TLV1821DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV1821DBVR 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 TLV1821DBVR?
For technical support, including TLV1821DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV1821DBVR requirements.
6.How does Aetrix verify that TLV1821DBVR is sourced from the original manufacturer or authorized distributors?
All TLV1821DBVR 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 TLV1821DBVR meets industry standards.
7.What is the process for return or replacement of TLV1821DBVR?
All TLV1821DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TLV1821DBVR, 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 TLV1821DBVR part is unused and in its original packaging.
Return procedure for TLV1821DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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