Texas Instruments TLV840MADL12DBVRQ1

Overview

TLV840MADL12DBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive voltage supervisor IC with open-drain active-low reset output, 1.2 V fixed detection threshold (VIT−), 120 nA typical supply current, ±0.5% typical threshold accuracy, and programmable reset time delay via CT pin. It monitors power rails in ADAS controllers and radar ECUs where ultra-low quiescent current and precise brownout detection are critical.

For engineers reviewing the TLV840MADL12DBVRQ1 datasheet, TLV840MADL12DBVRQ1 pinout, TLV840MADL12DBVRQ1 application, or TLV840MADL12DBVRQ1 equivalent, key selection criteria include its 1.2 V detection threshold, 40 µs minimum reset delay (CT pin floating), -40°C to +125°C operating range, open-drain active-low output topology, and SOT-23-5 package compatibility with space-constrained automotive PCB layouts.

Technical Context

The TLV840MADL12DBVRQ1 implements a precision bandgap-based comparator with built-in 5% typical hysteresis (VHYS) to prevent false resets during noisy supply transients. Its internal timer circuit uses the CT pin's RC time constant-driven by a 500 kΩ internal resistance-to generate user-programmable reset delays from 40 µs to >600 ms.

It features dual assertion triggers: automatic reset when VDD falls below 1.2 V (VIT−), and manual reset via MR pin with 500 ns minimum pulse width. The device asserts RESET low upon fault and holds it low for tD after VDD recovers above VIT− + VHYS, ensuring reliable microcontroller initialization in safety-critical automotive systems.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body size, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3840DL12QDBVRQ1 and TLV809MADL12DBVRQ1, TLV840MADL12DBVRQ1 delivers the lowest quiescent current and full delay programmability in the same footprint-enabling both extended battery life and timing adaptability without PCB changes.

Availability

TLV840MADL12DBVRQ1 is available at Aetrix Electronics and suitable for automotive radar ECUs, ADAS controllers, and telematics control units requiring stable component supply with AEC-Q100 compliance and long-term production support.

Supply support for TLV840MADL12DBVRQ1 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 designing analog and embedded processing solutions for automotive, industrial, and personal electronics markets.

The TLV840-Q1 product line delivers nano-power, high-accuracy voltage supervisors optimized for automotive safety-critical systems requiring AEC-Q100 qualification, wide temperature operation, and programmable reset timing.

FAQ

What is the exact detection threshold voltage of TLV840MADL12DBVRQ1?

The TLV840MADL12DBVRQ1 has a factory-set fixed negative threshold voltage (VIT−) of 1.2 V. This value is guaranteed across the full operating temperature range of –40°C to +125°C with ±0.5% typical accuracy and ±2% maximum deviation per datasheet Section 7.5. It does not require external resistors to set the threshold, simplifying design for 1.2 V rail monitoring.

How does the CT pin function in TLV840MADL12DBVRQ1?

The CT pin in TLV840MADL12DBVRQ1 enables user-programmable reset time delay (tD) by connecting an external capacitor to GND. With CT floating, tD is 40 µs typical. Adding capacitance extends tD-e.g., 10 nF yields ~6.2 ms, and 1 µF yields ~619 ms. The internal 500 kΩ CT resistance defines the RC time constant, per Equation 2 in the datasheet.

Is TLV840MADL12DBVRQ1 compatible with push-pull microcontroller reset inputs?

Yes-TLV840MADL12DBVRQ1's open-drain active-low RESET output is fully compatible with push-pull reset inputs. An external pull-up resistor (typically 10–100 kΩ to VDD or another logic rail) ensures proper high-state voltage levels. The output leakage current is only 10–350 nA, minimizing power loss while maintaining noise margin.

What is the minimum pulse width required on the MR pin of TLV840MADL12DBVRQ1?

The MR pin of TLV840MADL12DBVRQ1 requires a minimum logic-low pulse width of 500 ns to reliably assert reset, as specified in Section 7.6 (tMR_PW). Pulses shorter than this may fail to trigger reset. For robust operation, especially with GPIO-driven MR signals, TI recommends ≥1 µs pulses to accommodate timing skew and signal integrity margins.

Does TLV840MADL12DBVRQ1 support operation below 1.2 V supply?

Yes-TLV840MADL12DBVRQ1 operates with VDD as low as 0.7 V, though its 1.2 V detection threshold remains valid only when VDD ≥ VPOR (700 mV). Below VPOR, the RESET output state is undefined. The device maintains functionality down to 0.7 V, enabling use in ultra-low-voltage backup domains while retaining accurate 1.2 V supervision capability above VPOR.