Texas Instruments TLV1821LDBVR

Overview

TLV1821LDBVR 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 reliable startup in industrial motor drives and factory automation systems.

For engineers reviewing the TLV1821LDBVR datasheet, TLV1821LDBVR pinout, TLV1821LDBVR application, or TLV1821LDBVR equivalent, this page delivers verified electrical parameters, package-specific terminal mapping, functional safety documentation support, and real-world implementation context for high-voltage, low-power threshold detection.

Technical Context

The TLV1821LDBVR 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 V to 40 V supply range. Its rail-to-rail input operates from (V−) − 0.2 V to (V+) + 0.2 V, and internal Power-On Reset holds output in known state until V+ exceeds 1.7 V.

It features 150 fA input bias current, 500 μV max input offset voltage (±4 mV over −40°C to +125°C), and 100 dB PSRR across full supply range-enabling precision DC thresholding in noisy industrial environments without external filtering.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 1.60 mm × 2.90 mm body, 5-pin surface-mount, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1821DBVR, TLV1821LDBVR offers pinout compatibility with legacy LMC7211 designs, while LMV7211M5X trades voltage range and safety features for speed-making TLV1821LDBVR optimal for robust, wide-supply industrial sensing where reliability trumps raw speed.

Availability

TLV1821LDBVR is available at Aetrix Electronics and suitable for motor drives, factory automation I/O modules, appliance safety interlocks, and industrial sensor interfaces requiring stable component supply across extended temperature and voltage ranges.

Supply support for TLV1821LDBVR 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 for industrial, automotive, and consumer markets.

The TLV1821LDBVR belongs to TI's TLV18xx family of micro-power comparators designed specifically for high-voltage, low-quiescent-current threshold detection in harsh industrial and automotive environments.

FAQ

What is the maximum allowable pull-up voltage on the TLV1821LDBVR open-drain output?

The TLV1821LDBVR 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 higher-voltage logic without level shifters. Exceeding 40 V risks damage per Absolute Maximum Ratings, and short-circuiting to V+ above 12 V may cause thermal runaway-TI recommends series current limiting if fault conditions are possible. TLV1821LDBVR's output clamp structure is rated for 42 V absolute max.

Does TLV1821LDBVR include Power-On Reset, and how does it behave?

Yes, TLV1821LDBVR includes an internal Power-On Reset (POR) circuit that activates when V+ crosses 1.7 V during power-up or drops below that threshold during power-down. During POR, the open-drain output remains high-impedance (not pulled low), ensuring no false triggering of downstream logic. The POR timeout is ≤200 μs, after which output responds normally to input differential voltage. This behavior is documented in Section 7.4.3 of the TLV1821LDBVR datasheet and supports safe startup in unregulated industrial supplies.

Can TLV1821LDBVR operate with a 2.4 V supply, and what performance is guaranteed?

Yes, TLV1821LDBVR is fully specified down to 2.4 V supply (V+ − V−). At 2.4 V, quiescent current remains ≤7.5 μA, propagation delay increases to 900 ns (typ) for 10 mV overdrive, and input common-mode range extends from (V−) − 0.2 V to (V+) + 0.2 V. All key parameters-including 150 fA input bias current and 100 dB PSRR-are maintained across the full 2.4–40 V range. TLV1821LDBVR thus supports both ultra-low-power battery sensors and high-voltage industrial rails with consistent behavior.

How does the TLV1821LDBVR pinout differ from standard SOT-23-5 comparators?

TLV1821LDBVR uses the "L" variant pinout: Pin 1 = OUT, Pin 2 = V−, Pin 3 = IN+, Pin 4 = IN−, Pin 5 = V+. This reverses V+ and V− versus standard TLV1821DBVR (Pin 5 = V−, Pin 2 = V+), enabling direct replacement of older LMC7211/TLV7211 devices. The DBV package is identical; only pin assignments differ. Layouts designed for LMC7211 require no changes for TLV1821LDBVR, but those for TLV1821DBVR will need netlist and footprint updates to avoid supply reversal.

Is TLV1821LDBVR suitable for functional safety–certified systems?

Yes, TLV1821LDBVR is labeled "Functional Safety-Capable" by Texas Instruments. TI provides supporting documentation including FIT rate calculations (126 FIT), failure mode effects analysis (FMEA), and diagnostic coverage guidance for ISO 26262 ASIL-B and IEC 61508 SIL-2 system integration. While the device itself is not certified, its documented reliability data and architecture enable use in safety-related subsystems-e.g., motor overcurrent protection in ASIL-B drivetrain modules-when implemented per TI's safety manual. TLV1821LDBVR's POR, wide temp range, and stable offset support safety goals.