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Texas Instruments TLV1851DBVR
- Part No.:
- TLV1851DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLV1851DBVR.pdf
- Description:
- SINGLE NANOPOWER HIGH-VOLTAGE CO
- Quantity:
- Payment:
- Shipping:
Inventory:5,867
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Product details
Overview
TLV1851DBVR from Texas Instruments is a single-channel, nanopower comparator with push-pull output, operating from 1.8V to 40V supply and consuming only 440nA per channel. It features over-the-rail inputs (up to 40V above V−), fail-safe input operation with no supply required, and power-on reset for deterministic startup - enabling reliable voltage monitoring in battery-powered gas detectors and smoke sensors.
For engineers reviewing the TLV1851DBVR datasheet, TLV1851DBVR pinout, TLV1851DBVR application, or TLV1851DBVR equivalent, key selection criteria include its 440nA quiescent current, 40V input tolerance independent of V+, ±0.25mV typical offset voltage, 2.8mV internal hysteresis, and SOT-23-5 package compatibility with space-constrained always-on sensing nodes.
Technical Context
The TLV1851DBVR implements a fail-safe input stage with ESD clamps and snapback protection, allowing inputs to remain high-impedance and functional even when V+ is unpowered or below 1.5V. Its over-the-rail capability supports direct sensing of 24V/36V bus voltages without level-shifting circuitry.
Internally, it integrates a power-on reset (POR) circuit that holds the output in a known state until VS exceeds 1.5V, preventing false triggers during brown-out or cold-start conditions. The push-pull output drives loads directly - sinking up to 7mA and sourcing up to 5mA - eliminating external pull-up resistors in discrete threshold detection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply current | 440nA per channel at 12V - enables >10-year battery life in coin-cell–powered smoke detectors |
| Supply range | 1.8V to 40V - supports direct operation from Li-ion, 24V industrial rails, or automotive batteries |
| Input common-mode range | 0V to 40V above V−, independent of V+ - allows direct sensing of 36V battery packs without attenuation |
| Input offset voltage | ±0.25mV typical - ensures <10mV trip-point error across 0–40V input range at room temperature |
| Propagation delay | 13µs (high-to-low, 100mV overdrive, 25pF load) - sufficient for slow-varying housekeeping signals like battery voltage or temperature thresholds |
| Output type | Push-pull - eliminates need for external pull-up, reduces BOM count, and enables direct MOSFET gate drive |
| Operating temperature | –40°C to +125°C - qualified for under-hood automotive and industrial ambient environments |
Pinout & Package
SOT-23-5 package (1.60mm × 2.90mm body), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Comparator output | Push-pull stage - sinks or sources current; must not be wire-OR'd with other outputs |
| V− (Pin 2) | Negative supply | Reference ground node; all inputs and outputs referenced to this pin |
| IN+ (Pin 3) | Non-inverting input | High-impedance (>1TΩ) node; accepts voltages up to 40V above V−, even with V+ unpowered |
| IN− (Pin 4) | Inverting input | Identical over-the-rail capability as IN+; differential input voltage range ±42V |
| V+ (Pin 5) | Positive supply | Supplies internal bias; input common-mode range extends 40V above this pin's potential |
Key Features
| Feature | Design Value |
|---|---|
| Fail-safe inputs | Remain high-impedance and functional with V+ = 0V - eliminates power sequencing constraints in multi-rail systems |
| Over-the-rail input operation | IN+/IN− tolerate up to 40V above V− regardless of V+ value - enables direct high-side sensing without dividers |
| Power-on reset (POR) | Guarantees known output state until VS ≥ 1.5V - prevents spurious alarms during battery insertion or wake-up |
| No phase reversal | Maintains correct output polarity even with severe input overdrive - critical for safety-critical threshold detection |
| Reverse battery protection | Withstands –40V on V+ relative to V− - protects against accidental reverse-polarity installation in field-deployed sensors |
Applications
| Gas Detector | Smoke & Heat Detector |
|---|---|
Use Scenario: Detects electrochemical sensor output crossing preset toxic-gas threshold in portable handheld units. IC Role / Device Role / Timing Role: Single comparator performing analog voltage window comparison with hysteresis to reject noise-induced false alarms. Use Value: 440nA supply current extends AA/AAA battery life beyond 5 years; over-the-rail inputs interface directly with 3.3V reference and 24V sensor bias without attenuation. | Use Scenario: Monitors thermistor or ionization chamber signal to trigger alarm when temperature or smoke density exceeds UL-certified thresholds. IC Role / Device Role / Timing Role: Housekeeping comparator providing fail-safe, low-power voltage supervision during standby and alarm states. Use Value: Fail-safe inputs remain valid during brown-out; POR ensures clean startup after battery replacement; –40°C to +125°C rating covers attic and furnace-mount deployments. |
| Motion Detector | Gas Meter |
Use Scenario: Compares PIR sensor output against adjustable threshold to detect human movement in battery-powered security sensors. IC Role / Device Role / Timing Role: Low-power threshold detector enabling ultra-low-duty-cycle wake-up architecture. Use Value: 440nA IQ allows microamp-level sleep current; push-pull output directly drives MCU interrupt pin or RF transceiver enable line without pull-up resistor. | Use Scenario: Supervises supercapacitor backup voltage and main battery health in ultrasonic gas meters deployed in utility infrastructure. IC Role / Device Role / Timing Role: Dual-function comparator monitoring both charge status and end-of-life battery voltage. Use Value: 40V input tolerance accommodates 36V solar-charged backup systems; reverse-battery protection guards against field maintenance errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanopower comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1861DBVR | Open-drain output instead of push-pull; identical supply current, input range, and temperature rating | Required where output logic levels must translate to higher voltage domains (e.g., 5V or 12V MCU I/O) or multiple comparators share a wired-OR bus | Select TLV1861DBVR only if level translation or bus arbitration is needed; otherwise TLV1851DBVR reduces component count |
| TPS3700DDCR | Higher supply current (600nA), wider hysteresis (5mV typ), no over-the-rail inputs - limited to within-rail operation up to V+ | Suitable for simpler voltage supervisors where input signals stay within supply rails and faster propagation (1.5µs) is prioritized over ultra-low IQ | Choose TPS3700DDCR when speed outweighs power savings and input voltage stays ≤ V+; TLV1851DBVR remains superior for true over-the-rail sensing |
Compared with TLV1861DBVR, TLV1851DBVR eliminates external pull-up resistors and simplifies PCB layout; compared with TPS3700DDCR, it delivers 30% lower quiescent current and unique 40V-over-V− input tolerance - making it the only choice for direct high-voltage sensing in energy-harvesting and battery-backed safety systems.
Availability
TLV1851DBVR is available at Aetrix Electronics and suitable for gas detection, smoke alarm, and motion-sensing applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for TLV1851DBVR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The TLV185x family was designed specifically for ultra-low-power, high-voltage housekeeping functions - including battery voltage monitoring, temperature thresholding, and fault detection - in always-on, safety-critical sensing systems.
FAQ
What is the maximum input voltage the TLV1851DBVR can tolerate on IN+ or IN−?
The TLV1851DBVR supports an input voltage range of –0.1V to 40V relative to V− on both IN+ and IN− pins, independent of the V+ supply voltage. This over-the-rail capability allows direct connection to 24V or 36V sensor outputs without attenuation networks or level shifters - a feature confirmed in Section 5.4 (Recommended Operating Conditions) and Section 6.4.1.1 of the official datasheet.
Does the TLV1851DBVR require external pull-up resistors on its output?
No, the TLV1851DBVR features a push-pull output stage capable of both sourcing and sinking current, eliminating the need for external pull-up resistors. This reduces BOM count and power loss in battery-operated systems. The output can directly drive MCU interrupt pins, LEDs, or MOSFET gates - as specified in Section 6.4.3.1 and confirmed by the "Push-pull output option (TLV185x)" feature bullet in the datasheet.
Can the TLV1851DBVR operate with V+ disconnected or at 0V?
Yes - the TLV1851DBVR has fail-safe inputs that remain high-impedance and functional even when V+ is unpowered or below the minimum operating voltage. Inputs tolerate –0.1V to 40V relative to V− under these conditions, enabling robust operation during power sequencing or brown-out events. This behavior is explicitly documented in Section 6.4.1.2 ("Fail-Safe Inputs") and the "Fail-safe: high impedance inputs with no supply" feature list.
What is the typical propagation delay of the TLV1851DBVR at 12V supply?
At VS = 12V, the TLV1851DBVR exhibits a typical propagation delay of 13µs (high-to-low) and 14µs (low-to-high) with 100mV input overdrive and 10pF–25pF load capacitance. These values are measured under standardized test conditions in Section 5.6 and reflect its optimization for low-power, not high-speed, applications such as battery monitoring and environmental sensing.
How does the power-on reset (POR) function in the TLV1851DBVR?
The TLV1851DBVR incorporates an internal power-on reset circuit that holds the output in a known state until the supply voltage VS exceeds 1.5V. This prevents false triggering during system power-up, battery insertion, or brown-out recovery - ensuring deterministic behavior in safety-critical applications like smoke detectors. The POR threshold (VPOR = 1.5V) and timing (tON = 3ms) are specified in Sections 5.5 and 5.6 of the datasheet.
TLV1851DBVR 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:
- Push-Pull, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 1.8V ~ 40V
- :
- 3.6mV @ 12V
- Voltage - Input Offset (Max):
- 250pA @ 12V
- Current - Input Bias (Max):
- 7mA @ 12V
- Current - Output (Typ):
- 1µA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 45µs
- Propagation Delay (Max):
- 5mV
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
TLV1851DBVR FAQ
1.How can I place an order for TLV1851DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV1851DBVR 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 TLV1851DBVR reliable?
The price and inventory of TLV1851DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV1851DBVR is usually 5 days.
3.What payment methods are accepted for TLV1851DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV1851DBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV1851DBVR?
TLV1851DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV1851DBVR 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 TLV1851DBVR?
For technical support, including TLV1851DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV1851DBVR requirements.
6.How does Aetrix verify that TLV1851DBVR is sourced from the original manufacturer or authorized distributors?
All TLV1851DBVR 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 TLV1851DBVR meets industry standards.
7.What is the process for return or replacement of TLV1851DBVR?
All TLV1851DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TLV1851DBVR, 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 TLV1851DBVR part is unused and in its original packaging.
Return procedure for TLV1851DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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