Texas Instruments TLV1821DCKR

Overview

TLV1821DCKR 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. It operates across –40°C to +125°C and supports industrial motor drive voltage monitoring.

For engineers reviewing the TLV1821DCKR datasheet, TLV1821DCKR pinout, TLV1821DCKR application, or TLV1821DCKR equivalent, this page delivers verified electrical specs, SC-70-6 package mapping, functional safety documentation support, and real-world implementation guidance for high-voltage sensing in constrained-power systems.

Technical Context

The TLV1821DCKR implements an open-drain output stage with ESD-rated sink capability up to 40 V independent of its 2.4–40 V supply rails, enabling level translation and wired-OR logic. Its rail-to-rail input range extends from (V−) − 0.2 V to (V+) + 0.2 V, and internal POR holds output low until V+ ≥ 2.4 V with 200 μs activation window.

Input bias current is 150 fA (typ), offset voltage is ±0.5 mV (25°C), and PSRR is 100 dB - enabling precision threshold detection in noisy factory automation environments without external filtering. The device uses TI's proprietary low-leakage input structure and snapback ESD clamps on the output for robust 2 kV HBM operation.

Key Specifications

Pinout & Package

TLV1821DCKR is housed in a 6-pin SC-70 package (1.25 mm × 2.00 mm body), optimized for space-constrained PCB layouts in motor control modules and appliance power supplies.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar comparator applications.

Compared with TLV1821DBVR and LMV7219M5X, TLV1821DCKR uniquely combines 40 V operation, open-drain flexibility, POR assurance, and ultra-low IQ in a miniature SC-70-6 package - making it irreplaceable for robust, wide-supply industrial sensing where voltage range and startup integrity are non-negotiable.

Availability

TLV1821DCKR is available at Aetrix Electronics and suitable for motor drives, factory automation systems, and appliance power sequencing requiring stable component supply across extended temperature and voltage ranges.

Supply support for TLV1821DCKR 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 and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TLV1821DCKR belongs to TI's TLV18xx family of micro-power comparators designed specifically for high-voltage, low-quiescent-current sensing in harsh industrial environments with guaranteed startup behavior.

FAQ

What is the maximum allowable voltage on the TLV1821DCKR output pin?

The TLV1821DCKR output pin supports voltages from –0.3 V to 42 V relative to V−, enabling direct pull-up to 40 V external rails regardless of the comparator's own 2.4–40 V supply. This is confirmed in Section 5.1 Absolute Maximum Ratings and Figure 7-1 block diagram. Exceeding 42 V risks permanent damage to the output ESD clamp structure.

Does TLV1821DCKR require external pull-up resistors on its output?

Yes - TLV1821DCKR has an open-drain output and cannot source current; an external pull-up resistor is mandatory to define the logic HIGH state. TI recommends 100 μA to 1 mA pull-up current (e.g., 10 kΩ to 100 kΩ at 5–12 V), as specified in Section 7.4.2.2. Omitting the pull-up leaves the output undefined and non-functional.

How does the Power-On Reset (POR) function behave in TLV1821DCKR?

In TLV1821DCKR, the POR circuit holds the open-drain output low until V+ reaches ≥2.4 V and remains active for 200 μs thereafter, as documented in Section 5.3 and 7.4.3. This ensures the output stays inactive during power ramp-up, preventing false triggers in safety-critical monitoring circuits like overvoltage protection.

Can TLV1821DCKR inputs be driven beyond the supply rails?

No - TLV1821DCKR inputs must remain within (V−) − 0.2 V to (V+) + 0.2 V under normal operation. Although ESD clamps exist, exceeding these limits risks forward-biasing internal diodes and injecting >10 mA, potentially damaging the input stage. Section 7.4.1.1 explicitly prohibits rail-overdrive without current limiting.

Is TLV1821DCKR suitable for automotive applications?

TLV1821DCKR is rated for –40°C to +125°C and qualified to AEC-Q100 stress test standards per TI's product folder documentation. Its 40 V operation, 2 kV HBM ESD rating, and POR make it appropriate for 12 V/24 V automotive subsystems such as battery management and lighting control - provided board-level transient protection is implemented per ISO 7637-2.