Texas Instruments TLV3491AIDBVTG4

Overview

TLV3491AIDBVTG4 from Texas Instruments is a nanopower, rail-to-rail input/output comparator in 5-pin SOT-23 package, operating from 1.8 V to 5.5 V with 0.8 µA typical supply current, 6 µs propagation delay (at 100 mV overdrive), and ±15 mV input offset voltage - used for low-voltage battery monitoring and power-on reset circuits.

For engineers reviewing the TLV3491AIDBVTG4 datasheet, TLV3491AIDBVTG4 pinout, TLV3491AIDBVTG4 application, or TLV3491AIDBVTG4 equivalent, key selection criteria include ultra-low quiescent current, push-pull CMOS output stage compatibility with microcontroller I/O, input common-mode range extending 200 mV beyond rails, and validated operation at 1.8 V single-cell supply.

Technical Context

The TLV3491AIDBVTG4 implements a rail-to-rail input stage with ESD-protected diodes enabling ±500 mV overvoltage tolerance, and a push-pull CMOS output eliminating shoot-through current. Its internal architecture supports stable operation down to 1.8 V with no external biasing required.

It operates in a single functional mode across –40°C to +125°C, with input bias current ≤10 pA and common-mode rejection ratio of 60–74 dB. The device requires no hysteresis for clean switching under low-noise conditions but supports external hysteresis via positive feedback for noisy signal environments.

Key Specifications

Pinout & Package

TLV3491AIDBVTG4 is housed in a 5-pin SOT-23 package (2.90 mm × 1.60 mm body size) with exposed pad not electrically connected. Thermal resistance R_θJA is 237.8°C/W, requiring minimal PCB copper for thermal management in low-power applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV3491AIDBVTG4, TLV3491DBVR offers identical performance in a modern RoHS-compliant variant, while TLV7011DBVR trades nanopower for speed and reduced input range - making it incompatible for true rail-to-rail sensing at 1.8 V.

Availability

TLV3491AIDBVTG4 is available at Aetrix Electronics and suitable for battery-powered medical devices, wireless security sensors, and handheld instrumentation requiring stable component supply across extended product lifecycles.

Supply support for TLV3491AIDBVTG4 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 company headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and personal electronics markets.

The TLV3491AIDBVTG4 belongs to TI's nanopower comparator product line, engineered specifically for energy-constrained, single-cell battery applications where sub-1-µA quiescent current and rail-to-rail operation are mandatory.

FAQ

What is the maximum supply voltage rating for TLV3491AIDBVTG4?

The absolute maximum supply voltage for TLV3491AIDBVTG4 is 5.5 V. Exceeding this value may cause permanent damage. The recommended operating range is 1.8 V to 5.5 V, with full specification guaranteed across this span including at 1.8 V - critical for compatibility with single Li-ion or two alkaline cells. Operation above 5.5 V voids warranty and risks junction breakdown.

Does TLV3491AIDBVTG4 require external pull-up resistors on its output?

No, TLV3491AIDBVTG4 does not require external pull-up resistors because it features a push-pull CMOS output stage. This design actively drives both high and low states, delivering VOH ≤ 200 mV below V+ and VOL ≤ 200 mV above V− at 5 mA load. Using pull-ups would increase power consumption and degrade switching speed - counter to the nanopower intent of the TLV3491AIDBVTG4.

Can TLV3491AIDBVTG4 operate with input voltages beyond the supply rails?

Yes, TLV3491AIDBVTG4 supports an input common-mode range from (V−) − 0.2 V to (V+) + 0.2 V. This rail-to-rail-plus margin allows direct connection of sensors or signals that swing slightly beyond the supply rails - such as thermocouples or op-amp outputs - without clamping diodes or level shifters. However, input current must be limited to ≤10 mA if exceeding rails by >500 mV due to internal ESD diode conduction.

What is the typical propagation delay of TLV3491AIDBVTG4 at 1.8 V supply?

At 1.8 V supply and 100 mV input overdrive, TLV3491AIDBVTG4 exhibits a typical propagation delay of 6 µs for both t_PLH and t_PHL. This value remains stable across the full 1.8–5.5 V supply range per TI SBOS262E datasheet Section 7.8. The delay increases slightly at lower overdrive (e.g., 12 µs at 10 mV), confirming suitability for moderate-speed threshold detection rather than high-frequency signal conditioning.

Is TLV3491AIDBVTG4 pin-compatible with other comparators in the TLV349x family?

TLV3491AIDBVTG4 shares the same 5-pin SOT-23 pinout as all TLV3491 variants (e.g., TLV3491DBVR), but is not pin-compatible with TLV3492 (dual, 8-pin) or TLV3494 (quad, 14-pin). Within the TLV3491 family, pin functions - OUT, +IN, −IN, V+, V− - are identical across packages. No PCB redesign is needed when substituting TLV3491AIDBVTG4 with TLV3491DBVR or TLV3491IDBVR, provided thermal and marking requirements align.