Texas Instruments TLV1821LQDBVRQ1

Overview

TLV1821LQDBVRQ1 from Texas Instruments is an automotive-grade single-channel comparator with open-drain output, rail-to-rail input, 40V supply capability, 5μA quiescent current per channel, and 420ns typical propagation delay. It operates from –40°C to +125°C and is used in HEV/EV powertrain voltage monitoring circuits where high-voltage tolerance and low-power wake-up detection are required.

For engineers reviewing the TLV1821LQDBVRQ1 datasheet, TLV1821LQDBVRQ1 pinout, TLV1821LQDBVRQ1 application, or TLV1821LQDBVRQ1 equivalent, key selection criteria include its 40V open-drain output compatibility with external pull-ups up to 40V, AEC-Q100 Grade 1 qualification, Power-On Reset (POR) for reliable startup, and rail-to-rail input range extending 200mV beyond supply rails.

Technical Context

The TLV1821LQDBVRQ1 implements a rail-to-rail input stage with internal ESD clamps to V− and a soft upper clamp to V+ via 5kΩ resistance, requiring input overvoltage limiting to ≤200mV beyond rails. Its open-drain output supports independent pull-up voltages up to 40V-decoupled from the comparator's own 2.4V–40V supply-and enables wired-OR logic and level translation.

It integrates a dedicated Power-On Reset circuit that holds the output in a known state until V+ reaches ≥1.7V, preventing false triggering during system power-up/down. The device draws only 5μA per channel across temperature (–40°C to +125°C) and maintains ±0.5mV typical input offset voltage with ±1.2µV/°C drift.

Key Specifications

Pinout & Package

SOT-23-5 package (DBV), 1.60mm × 2.90mm body size, with "LMC72x1/TLV72x1 type" alternate pinout (TLV1821L-Q1 variant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1821QDBVRQ1, TLV1821LQDBVRQ1 offers backward compatibility with LMC7211/TLV7211 layouts, while TLV1822QDRQ1 delivers dual functionality in one package-both retain identical AEC-Q100 Grade 1 rating, 40V tolerance, and POR behavior but differ in channel count and mechanical fit.

Availability

TLV1821LQDBVRQ1 is available at Aetrix Electronics and suitable for HEV/EV battery monitoring, automotive body control modules, and infotainment power sequencing requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for TLV1821LQDBVRQ1 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 deep expertise in automotive-grade IC design and functional safety development.

The TLV1821LQDBVRQ1 belongs to TI's automotive comparator portfolio designed specifically for robust, low-power voltage monitoring in harsh 12V/24V/42V vehicle environments - emphasizing AEC-Q100 qualification, rail-to-rail operation, and fault-resilient startup behavior.

FAQ

What is the maximum allowable input voltage beyond the supply rails for TLV1821LQDBVRQ1?

The TLV1821LQDBVRQ1 rail-to-rail input stage tolerates signals from (V−) − 0.2V to (V+) + 0.2V. Exceeding this by more than 200mV risks conduction through internal ESD clamps; input current must be limited to ≤1mA using series resistance if overvoltage is possible. This limit is specified in Section 7.4.1.1 and Table 5.3 of the datasheet.

Can TLV1821LQDBVRQ1 drive a 40V pull-up directly from its open-drain output?

Yes - the TLV1821LQDBVRQ1 open-drain output supports external pull-up voltages up to 40V relative to V−, independent of its own supply voltage (2.4V–40V). This enables direct interfacing with higher-voltage logic or discrete gate drivers without level shifters, as confirmed in Section 7.3 and Table 5.3.

Does TLV1821LQDBVRQ1 include Power-On Reset, and what is its activation threshold?

Yes, TLV1821LQDBVRQ1 integrates a Power-On Reset (POR) circuit that holds the output in a known state until V+ reaches ≥1.7V. This prevents false outputs during cold-cranking or brown-out events and is validated per AEC-Q100 requirements, as detailed in Section 7.4.3 and Table 5.7.

What is the typical propagation delay of TLV1821LQDBVRQ1 under standard test conditions?

The TLV1821LQDBVRQ1 exhibits 420ns typical propagation delay (low-to-high) at 100mV input overdrive, CL = 50pF, and VS = 12V, as specified in Table 5.8. Delay varies with overdrive and supply voltage - e.g., 450ns at 100mV/50pF with VS = 2.4V - and remains stable across –40°C to +125°C.

Is TLV1821LQDBVRQ1 pin-compatible with older comparators like TLV7211 or LMC7211?

Yes - TLV1821LQDBVRQ1 uses the "LMC72x1/TLV72x1 type" pinout (IN−/V−/IN+/OUT/V+), making it a direct drop-in replacement for TLV7211, TLV7221, LMC7211, and LMC7221 in SOT-23-5 layouts. This alternate pinout is explicitly documented in Section 4 and Table 4-1 of the datasheet.