Texas Instruments TLV840NADH29DBVR

Overview

TLV840NADH29DBVR from Texas Instruments is a nano-power voltage supervisor IC with fixed 2.9 V detection threshold, open-drain active-high RESET output, and factory-programmed 40 µs reset time delay. It operates from 0.7 V to 6 V supply, draws only 120 nA typical quiescent current, and delivers ±0.5% threshold accuracy with 5% built-in hysteresis - enabling reliable power-on reset and brownout monitoring in ultra-low-power battery-operated systems.

For engineers reviewing the TLV840NADH29DBVR datasheet, TLV840NADH29DBVR pinout, TLV840NADH29DBVR application, or TLV840NADH29DBVR equivalent, this page provides verified functional identity, SOT-23-5 package mapping, confirmed 5-pin terminal roles, exact timing behavior (t_{P_HL} = 30 µs typ, t_D = 40 µs), and real-world industrial use cases requiring sub-1 µA supervision with precise 2.9 V rail validation.

Technical Context

The TLV840NADH29DBVR implements a precision bandgap-based comparator with internal hysteresis to reject VDD transients up to 10 µs duration at 5% overdrive. Its fixed 2.9 V threshold (V_IT−) triggers RESET assertion when VDD falls below that level, and RESET deasserts only after VDD rises above V_IT+ = V_IT− + V_HYS and the 40 µs delay expires - no external capacitor or manual reset required.

This variant belongs to the TLV840N series: it lacks CT and MR pins (both NC), uses open-drain active-high output topology (DH suffix), and supports operation across –40°C to +125°C ambient. Unlike C/M variants, it offers no programmable delay or manual reset - delivering deterministic, low-jitter reset timing critical for microcontroller boot integrity in harsh environments.

Key Specifications

Pinout & Package

TLV840NADH29DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts and automated assembly. Pin 1 is marked via dot or chamfered corner; pin count and spacing conform to JEDEC MO-178AB standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840DL29DBVR and TLV809E29DBVR, TLV840NADH29DBVR delivers superior low-power performance (120 nA vs ≥350 nA), tighter threshold accuracy (±0.5% vs ≥±1.5%), and guaranteed glitch immunity - making it the optimal choice for battery-critical and noise-prone industrial deployments requiring deterministic 2.9 V supervision.

Availability

TLV840NADH29DBVR is available at Aetrix Electronics and suitable for motor drive control, factory automation I/O modules, grid-edge smart meters, and data center BMC subsystems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for TLV840NADH29DBVR 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 power management technologies, with decades of experience in high-reliability industrial and automotive IC design.

The TLV840 family was engineered specifically for ultra-low-power voltage supervision in battery-backed and energy-harvesting systems - delivering nanoscale current consumption without sacrificing accuracy, speed, or robustness across extended temperature ranges.

FAQ

What is the exact reset threshold voltage of TLV840NADH29DBVR?

The TLV840NADH29DBVR has a factory-trimmed negative-going input threshold (V_IT−) of 2.9 V with ±0.5% typical accuracy across –40°C to +125°C. This value is fixed and non-adjustable - confirmed in TI's SNVSBC3C datasheet Section 7.5 and device nomenclature ('29' = 2.9 V). No external components affect this threshold, ensuring consistent behavior across production lots and temperature extremes.

Does TLV840NADH29DBVR support manual reset or capacitor-programmable delay?

No. TLV840NADH29DBVR is a TLV840N-series device: Pins 4 (MR) and 5 (CT) are both no-connect (NC), and the reset time delay is factory-fixed at 40 µs. Unlike TLV840C or TLV840M variants, it does not accept external capacitors or logic-level manual reset signals - simplifying layout and eliminating timing variability due to capacitor tolerance or PCB parasitics.

What output topology does TLV840NADH29DBVR use, and how should it be interfaced?

TLV840NADH29DBVR uses an open-drain active-high (DH) output. The RESET pin remains high-impedance when deasserted and pulls low only during reset assertion. An external pull-up resistor (typically 10 kΩ–100 kΩ to V_CC or another logic rail ≤6.5 V) is mandatory to establish valid logic-high voltage. This topology allows level-shifting and wired-OR configurations with other supervisors or controllers.

Can TLV840NADH29DBVR monitor supply voltages below 1 V?

Yes. TLV840NADH29DBVR operates and monitors VDD from 0.7 V to 6 V - fully supporting sub-1 V rails such as 0.8 V or 0.9 V core supplies in modern low-power MCUs. Its 2.9 V threshold is applied relative to the monitored VDD pin, so it remains functional even when VDD itself is as low as 0.7 V, provided the 2.9 V rail being supervised meets that minimum.

How does TLV840NADH29DBVR handle power supply transients?

TLV840NADH29DBVR incorporates built-in glitch immunity: it rejects transients shorter than 10 µs at 5% overdrive (per Section 7.6 t_{GI_VIT−}). Combined with 5% hysteresis (145 mV at 2.9 V), this prevents false resets caused by switching noise, ESD coupling, or rapid load transients - a key differentiator versus basic reset ICs lacking specified transient rejection capability.