Texas Instruments TLV1822DDFR

Overview

TLV1822DDFR from Texas Instruments is a dual-channel, 40V rail-to-rail input comparator with open-drain outputs, designed for high-voltage industrial sensing and motor control feedback loops. It operates from 2.4V to 40V supply, delivers 420ns propagation delay at 12V, draws only 5μA per channel, and features Power-On Reset (POR) to prevent false triggering during power-up. Its open-drain output supports 40V pull-up independent of supply voltage.

For engineers reviewing the TLV1822DDFR datasheet, TLV1822DDFR pinout, TLV1822DDFR application, or TLV1822DDFR equivalent, key selection criteria include its 40V operation range, rail-to-rail input capability down to –0.2V below V–, 150fA input bias current, –40°C to +125°C temperature rating, and functional safety documentation support.

Technical Context

The TLV1822DDFR implements a dual-comparator architecture with independent rail-to-rail inputs and open-drain outputs, each capable of sinking up to 30mA. Its internal Power-On Reset circuit holds the output in a known state until V+ reaches ≥2.4V, then releases after ≤200μs - critical for reliable startup in motor drives and factory automation systems.

Unlike push-pull variants (TLV181x), the TLV1822DDFR's open-drain output enables wired-OR logic, level translation across voltage domains (e.g., 3.3V comparator controlling 24V logic), and direct interfacing with external 40V pull-ups without requiring matching supply rails.

Key Specifications

Pinout & Package

TLV1822DDFR is housed in an 8-pin DDF package (SOT-23-8), measuring 1.60mm × 2.90mm, with exposed thermal pad connected directly to V– for enhanced thermal performance in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1822IDR, TLV1822DDFR offers 40% smaller PCB area and 3× lower thermal resistance; compared with LMV7235M5X, it provides 7× wider supply range, 3× faster response, and certified functional safety capability - making TLV1822DDFR the sole choice for industrial 24V+ systems requiring reliability and compliance.

Availability

TLV1822DDFR is available at Aetrix Electronics and suitable for motor drives, factory automation systems, and appliance safety interlocks requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for TLV1822DDFR 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 decades of expertise in high-reliability industrial and automotive components.

The TLV1822DDFR belongs to TI's TLV182x family of micro-power comparators, engineered specifically for robust, wide-supply-voltage sensing in harsh industrial environments - emphasizing low quiescent current, rail-to-rail input, and functional safety readiness.

FAQ

What is the maximum allowable pull-up voltage on the TLV1822DDFR open-drain outputs?

The TLV1822DDFR open-drain outputs support pull-up voltages up to 40V, independent of the comparator's own supply voltage (V+). This allows interfacing with higher-voltage logic buses or PLC inputs while operating from a lower supply such as 3.3V or 5V - a key advantage over standard comparators limited to V+.

Does the TLV1822DDFR include Power-On Reset, and how does it behave during startup?

Yes, the TLV1822DDFR includes an internal Power-On Reset (POR) circuit that holds both outputs inactive until V+ reaches ≥2.4V and remains asserted for ≤200μs thereafter. During this period, the open-drain outputs remain high-impedance - preventing false triggers in motor control or safety interlock circuits during power ramp-up.

Can the TLV1822DDFR operate from a single 3.3V supply, and what performance trade-offs apply?

Yes, the TLV1822DDFR operates from 2.4V to 40V, so 3.3V is fully supported. At 3.3V, propagation delay increases to ~900ns (vs. 420ns at 12V), and output sink current capability reduces proportionally - but rail-to-rail input range (–0.2V to 3.5V) and 150fA bias current remain unchanged, preserving accuracy in low-voltage sensor interfaces.

How should unused comparator channels be configured on the TLV1822DDFR?

Unused inputs on the TLV1822DDFR must never be shorted together. Instead, tie one input (e.g., IN2+) to a stable voltage within the common-mode range (e.g., V– or V+), and the other (IN2–) to a different voltage providing ≥50mV differential - such as a resistor divider - to prevent high-frequency oscillation caused by internal noise amplification.

Is the TLV1822DDFR qualified for functional safety applications, and what documentation is available?

Yes, the TLV1822DDFR is functional safety-capable, with TI providing documented FIT rate, failure mode analysis, and diagnostic coverage metrics. These resources support ISO 26262 ASIL-B and IEC 61508 SIL-2 system-level certification - essential for motor drives, elevators, and industrial machinery requiring safety integrity.