Texas Instruments TLV840MADL31DBVRQ1

Overview

TLV840MADL31DBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive voltage supervisor IC with open-drain active-low reset output, 3.1 V fixed 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 nano-power consumption and precise brownout detection are critical.

For engineers reviewing the TLV840MADL31DBVRQ1 datasheet, TLV840MADL31DBVRQ1 pinout, TLV840MADL31DBVRQ1 application, or TLV840MADL31DBVRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade specifications, and real-world implementation constraints for battery-backed and low-voltage automotive subsystems.

Technical Context

The TLV840MADL31DBVRQ1 implements a precision bandgap-based comparator with built-in 5% typical hysteresis (VHYS) to prevent false resets during voltage transients. Its glitch immunity requires ≥10 µs pulse width at ≥5% VIT− overdrive on VDD.

Reset assertion occurs when VDD falls below 3.1 V (VIT−); deassertion requires VDD to rise above 3.255 V (VIT− + VHYS) followed by a user-programmable delay (tD) set by external capacitor on CT pin - minimum 40 µs (CT floating), scalable to >600 ms with 1 µF.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV840MADL31DBVRQ1, TLV840MADL30DBVRQ1 offers identical nano-power performance at 3.0 V but requires threshold alignment, while TPS3808G33QDBVRQ1 trades 13× higher quiescent current for integrated push-pull drive and tighter 0.25% accuracy - suitable where power budget allows and CT flexibility is unnecessary.

Availability

TLV840MADL31DBVRQ1 is available at Aetrix Electronics and suitable for automotive radar ECUs, surround-view camera modules, and telematics control units requiring stable component supply under AEC-Q100 compliance and long-term production continuity.

Supply support for TLV840MADL31DBVRQ1 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 specializing in analog and embedded processing technologies, with leadership in automotive-grade power management and signal conditioning ICs.

The TLV840-Q1 product line was designed specifically for AEC-Q100-compliant voltage monitoring in battery-sensitive automotive subsystems - emphasizing nano-power operation, programmable timing, and robust transient immunity.

FAQ

What is the exact fixed threshold voltage (VIT−) of TLV840MADL31DBVRQ1?

The TLV840MADL31DBVRQ1 has a factory-trimmed fixed negative-going threshold voltage (VIT−) of 3.1 V, with ±0.5% typical accuracy across –40°C to +125°C. This value is encoded in the part number "31" per TI's nomenclature (08 = 0.8 V, 31 = 3.1 V, 54 = 5.4 V). The device asserts RESET when VDD falls below this level and holds it asserted until VDD rises above 3.255 V (3.1 V + 5% hysteresis) plus the programmed delay time.

Does TLV840MADL31DBVRQ1 require an external pull-up resistor on the RESET pin?

Yes, TLV840MADL31DBVRQ1 uses an open-drain active-low RESET output (denoted by "D" and "L" in the part number), so it requires an external pull-up resistor to VDD or another logic-compatible rail (up to 6.5 V). Typical values range from 10 kΩ to 100 kΩ depending on rise time and bus capacitance. Without this resistor, RESET remains floating and cannot drive a valid high logic level - a mandatory design requirement confirmed in TI's datasheet Section 6 and Figure 7-1.

How is the reset time delay (tD) programmed on TLV840MADL31DBVRQ1?

The reset time delay (tD) on TLV840MADL31DBVRQ1 is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With CT floating, tD is 40 µs typical. Adding capacitance scales tD linearly: 10 nF yields ~6.2 ms, 100 nF ~62 ms, and 1 µF ~619 ms. The relationship follows tD ≈ 618937 × CCT (in µF) + 80 µs, per TI's Equation 3. Capacitor tolerance directly impacts delay accuracy, and values >10 µF are not recommended due to incomplete discharge risk during short faults.

Can TLV840MADL31DBVRQ1 monitor voltages below 0.9 V?

No, TLV840MADL31DBVRQ1 cannot reliably monitor voltages below its specified operating range minimum of 0.7 V, and its fixed 3.1 V threshold makes sub-0.9 V monitoring functionally irrelevant. The device's VIT− is fixed at 3.1 V - it does not support adjustable thresholds or low-VDD operation below 0.7 V. For sub-1 V rails (e.g., 0.8 V core supplies), TI recommends alternatives like TLV809 or discrete solutions; TLV840MADL31DBVRQ1 is purpose-built for 3.1 V and higher automotive rails.

Is TLV840MADL31DBVRQ1 compatible with 1.8 V logic systems?

TLV840MADL31DBVRQ1 supports 1.8 V logic compatibility only on its MR input pin, which accepts VMR_L ≤ 0.3×VDD and VMR_H ≥ 0.7×VDD - meaning at VDD = 1.8 V, MR logic low is ≤0.54 V and logic high is ≥1.26 V. However, the device itself requires VDD ≥ 0.7 V to operate, and its 3.1 V VIT− threshold means it cannot supervise 1.8 V rails. It can coexist in 1.8 V systems only as a supervisor for higher rails (e.g., 3.3 V I/O supply) while accepting MR signals from 1.8 V GPIOs.