Texas Instruments TLV3491AID

Overview

TLV3491AID from Texas Instruments is a single-channel, nanopower, rail-to-rail input/output comparator with push-pull CMOS output stage, designed for ultra-low-power systems operating from 1.8 V to 5.5 V. It delivers 6 µs propagation delay (at 100 mV overdrive), 0.8 µA typical quiescent current, and ±200-mV beyond-rail input common-mode range - enabling reliable operation in battery-powered medical sensors and handheld instrumentation.

For engineers reviewing the TLV3491AID datasheet, TLV3491AID pinout, TLV3491AID application, or TLV3491AID equivalent, key selection criteria include its nanopower consumption, rail-to-rail input capability, push-pull output eliminating external pull-up needs, low offset voltage (±15 mV max), and compatibility with single-cell Li-ion or two-cell alkaline supplies.

Technical Context

The TLV3491AID employs a fully differential input stage with ESD-protected inputs rated for ±3000 V HBM, supporting common-mode voltages from (V–) – 0.2 V to (V+) + 0.2 V. Its push-pull output drives high-impedance loads directly without external resistors and exhibits no shoot-through current during switching.

It operates across –40°C to +125°C with supply rejection of 350–1000 µV/V and maintains stable performance under capacitive loads up to 1 nF, with propagation delay varying predictably with input overdrive (6 µs at 100 mV) and temperature (±12 µV/°C offset drift).

Key Specifications

Pinout & Package

TLV3491AID is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size), optimized for automated assembly and thermal performance (R_θJA = 201.9°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV3491AID, TLV3491DBVR offers identical functionality in a smaller package but reduced thermal performance, while TLV7011DBVR trades speed and output drive for lower quiescent current - making TLV3491AID the optimal balance of nanopower, speed, and ease of use in SOIC-based designs.

Availability

TLV3491AID is available at Aetrix Electronics and suitable for portable medical equipment, wireless security systems, handheld instruments, ultra-low-power system supervision, and battery-backed sensor nodes requiring stable component supply across extended production lifecycles.

Supply support for TLV3491AID 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, with over 90 years of innovation in precision analog design and low-power technology.

The TLV349x product line was engineered specifically for nanopower, rail-to-rail sensing in battery-constrained applications - targeting portable healthcare, industrial IoT, and energy-harvesting systems where every nanoamp counts.

FAQ

What is the maximum operating temperature for TLV3491AID?

The TLV3491AID is specified to operate continuously from –40°C to +125°C ambient temperature. Its SOIC package has a junction-to-ambient thermal resistance of 201.9°C/W, so at 125°C ambient and 0.85 µA quiescent current, self-heating remains negligible (< 0.2°C). This makes TLV3491AID suitable for under-hood automotive modules and industrial enclosures without forced cooling.

Does TLV3491AID require external hysteresis for noise immunity?

Yes - the TLV3491AID has a typical input offset voltage of ±15 mV, meaning input noise within this band can cause multiple output transitions. For noisy environments (e.g., motor-driven sensors), external hysteresis must be added via positive feedback to the +IN pin. A typical 10-mV hysteresis can be achieved with R1 = 560 kΩ and R2 = 39 kΩ, as shown in TI's SBOS262E datasheet Figure 17.

Can TLV3491AID interface directly with a 3.3-V microcontroller GPIO?

Yes - the TLV3491AID's push-pull CMOS output swings rail-to-rail and is fully compatible with 3.3-V logic. When powered from 3.3 V, its VOL is ≤200 mV and VOH ≥3.1 V at 5 mA load, meeting standard 3.3-V CMOS input thresholds (VIH ≥2.0 V, VIL ≤0.8 V). No level-shifter or pull-up resistor is needed.

What decoupling capacitors are recommended for TLV3491AID?

TI recommends placing a 0.01-µF ceramic capacitor in parallel with a 10-µF electrolytic (or tantalum) capacitor between V+ and V– pins, located as close as possible to the device. The 0.01-µF capacitor suppresses high-frequency noise (>1 MHz), while the 10-µF capacitor handles lower-frequency supply ripple - both are essential to maintain TLV3491AID's 6-µs propagation delay stability and low-offset accuracy.

Is TLV3491AID pin-compatible with other comparators in the TLV349x family?

No - TLV3491AID (8-pin SOIC) shares the same pinout as TLV3491D but is not pin-compatible with dual TLV3492 or quad TLV3494 variants. Within the TLV3491 family, only the SOIC-8 variant (TLV3491AID, TLV3491D) uses this exact pin mapping; the SOT-23-5 version (TLV3491DBVR) has different pin assignments and fewer terminals (no NC pins).