Texas Instruments TLV1861DBVR

Overview

TLV1861DBVR from Texas Instruments is a single-channel, nanopower open-drain comparator with 440nA supply current, 1.8V to 40V supply range, over-the-rail input capability up to 40V above V−, and –40°C to +125°C operating temperature. It serves as a precision voltage monitor in battery-powered always-on systems such as gas detectors and motion sensors.

For engineers reviewing the TLV1861DBVR datasheet, TLV1861DBVR pinout, TLV1861DBVR application, or TLV1861DBVR equivalent, key selection criteria include its fail-safe inputs, Power-On Reset (POR) for deterministic startup, reverse-battery protection, no phase reversal under overdrive, and compatibility with wide common-mode input voltages independent of supply rail.

Technical Context

The TLV1861DBVR implements a fail-safe input stage with ESD clamps and snapback protection, enabling robust operation when inputs exceed V+ by up to 40V while maintaining high-impedance behavior even with unpowered supplies. Its internal POR circuit holds output in a known state until supply exceeds 1.5V.

As an open-drain device, it supports level translation across voltage domains (0–40V pull-up), logical OR-ing of multiple comparators, and low-power wake-up signaling. Input hysteresis is fixed at 2.8mV typical, and offset voltage remains within ±4.4mV over full temperature range.

Key Specifications

Pinout & Package

SOT-23-5 package (1.60mm × 2.90mm body size), surface-mount, RoHS-compliant, thermal resistance R_θJA = 168.1°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1861DBVR, TLV1861DBVT offers identical performance in alternate packaging, while TLV7011DBVR trades off voltage range, input robustness, and power efficiency for lower unit cost in narrow-supply applications.

Availability

TLV1861DBVR is available at Aetrix Electronics and suitable for gas detection, motion sensing, smoke/heat alarm, and servo position monitoring requiring stable component supply across automotive-grade temperature ranges and long-life battery operation.

Supply support for TLV1861DBVR 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 delivering analog and embedded processing solutions, with leadership in precision analog, low-power design, and industrial interface technologies.

The TLV186x family was designed specifically for nanopower, high-voltage-compatibility comparators in always-on monitoring systems - emphasizing fail-safe inputs, reverse-polarity resilience, and deterministic startup for safety-critical and battery-constrained applications.

FAQ

What is the maximum input voltage the TLV1861DBVR can tolerate relative to V−?

The TLV1861DBVR supports an input common-mode voltage range of –0.1V to 40V relative to V−, verified across –40°C to +125°C. This over-the-rail capability allows inputs to exceed V+ by up to 40V without damage or false triggering - critical for monitoring battery voltage in reverse-connected installations or high-side sensing in 24V/36V systems. The TLV1861DBVR maintains high-impedance behavior even when V+ is unpowered.

Does the TLV1861DBVR require external pull-up resistors on its output?

Yes, the TLV1861DBVR features an open-drain output and requires an external pull-up resistor to establish a logic-high state. TI recommends limiting pull-up current to <100µA to optimize VOL (typically 1mV at 2µA sink), though values down to 1MΩ are usable. Lower resistance improves rise time but increases static power and degrades VOL; the TLV1861DBVR's output leakage is ≤0.3pA, enabling ultra-high-impedance pull-ups for minimal quiescent load.

How does the Power-On Reset (POR) function in the TLV1861DBVR?

The TLV1861DBVR incorporates an internal POR circuit that holds the output in a known high-impedance state until V+ rises above 1.5V. Once triggered, the output responds normally to input conditions. This prevents false alarms or spurious MCU interrupts during power-up, brown-out, or battery insertion - a key reliability feature confirmed in TI's SNOSDE7B datasheet Section 5.4 and 6.4.1.2. The TLV1861DBVR POR is active across full temperature range.

Can unused inputs on the TLV1861DBVR be left floating?

No - unused inputs on the TLV1861DBVR must not be left floating or tied together. Due to its high bandwidth and low offset, floating or shorted inputs may cause oscillation from internal noise. TI specifies that each unused input must be biased within the valid common-mode range (–0.1V to 40V vs. V−) with ≥50mV differential (e.g., IN+ grounded, IN− tied to V+). This requirement is documented in Section 6.4.1.3 of the TLV1861DBVR datasheet and applies strictly to maintain stability.

What is the typical propagation delay of the TLV1861DBVR under standard conditions?

The TLV1861DBVR exhibits a typical high-to-low propagation delay of 13µs when VOD = 100mV, CL = 25pF, and VSTEP = 200mV (Section 5.6). Low-to-high delay is 35µs under open-drain conditions with RP = 1MΩ. These values scale with overdrive and load capacitance - e.g., delay drops to 16µs (LH) at 50mV overdrive. All timing specs are characterized at TA = 25°C, VS = 12V, and apply directly to the TLV1861DBVR SOT-23-5 variant.