Texas Instruments TPS3899DL41DSER

Overview

TPS3899DL41DSER from Texas Instruments is a nano-power, precision voltage supervisor with push-button monitoring capability, ±0.5% threshold accuracy, 125nA typical quiescent current, and programmable sense/reset delay via external capacitors on CTS and CTR pins; used in battery-powered industrial and computing systems for reliable power-rail and manual-reset supervision.

For engineers reviewing the TPS3899DL41DSER datasheet, TPS3899DL41DSER pinout, TPS3899DL41DSER application, or TPS3899DL41DSER equivalent, key selection considerations include its open-drain active-low RESET output, 0.505V adjustable threshold, 1.5mm × 1.5mm WSON-6 package, –40°C to +125°C operation, and dual-capacitor programmability for independent assertion/deassertion timing control.

Technical Context

The TPS3899DL41DSER implements a precision comparator with built-in 5% hysteresis and separate VDD/SENSE inputs enabling rail-independent monitoring. Its CTS pin controls reset assertion delay (30µs minimum, up to ~6.5s with 10µF), while CTR governs deassertion delay (40µs minimum, same max range).

It supports adjustable threshold sensing at 0.505V (typical) with high-impedance SENSE input (≤0.1µA leakage), operates from 0.85V to 6V supply, and delivers functional safety documentation support without requiring external components for basic supervision.

Key Specifications

Pinout & Package

Package: 1.5mm × 1.5mm WSON-6 with exposed thermal pad (DSE). Compact footprint enables space-constrained PCB layouts in portable and embedded systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3899DL41DSER, the TPS3897DL41DSER trades adjustability and ultra-low I_DD for lower unit cost, while the MAX6373KA29+T offers mature availability but lacks programmable timing and nano-power operation - making the TPS3899DL41DSER optimal for new designs requiring precision, flexibility, and energy efficiency.

Availability

TPS3899DL41DSER is available at Aetrix Electronics and suitable for electricity meters, building automation controllers, and solid-state drives requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for TPS3899DL41DSER 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 power management, signal chain, and high-reliability ICs.

The TPS3899 family was designed for ultra-low-power, high-accuracy system supervision in battery-critical and thermally demanding applications - delivering precision thresholding, programmable timing, and functional safety support in minimal footprint.

FAQ

What is the function of the CTS pin on the TPS3899DL41DSER?

The CTS pin on the TPS3899DL41DSER sets the sense delay - the time between SENSE voltage falling below V_IT− and RESET assertion. It features an internal 500kΩ pull-up; connecting a capacitor to ground yields a programmable delay from 30µs (open) to ~6.5s (10µF), enabling push-button debouncing or noise rejection. This behavior is confirmed in TI's SLVSFM0C datasheet Section 5.6 and Figure 6-2.

Does the TPS3899DL41DSER require an external pull-up resistor on the RESET pin?

Yes, the TPS3899DL41DSER has an open-drain active-low RESET output and requires an external pull-up resistor to a valid logic voltage (up to 6V). The datasheet specifies 100kΩ as typical for 10pF load conditions. Without this resistor, RESET cannot transition high, preventing proper system reset release. This requirement is explicitly stated in Table 5-1 and Section 6.3.3 of the SLVSFM0C datasheet.

What is the minimum supply voltage required for the TPS3899DL41DSER to operate correctly?

TPS3899DL41DSER requires a minimum VDD of 0.85V for DL/PL output variants (including TPS3899DL41DSER) to guarantee specified functionality, including ±0.5% threshold accuracy and programmable delay operation. Below 0.85V, the device enters undefined state per VPOR = 700mV specification and Section 5.5 Electrical Characteristics. Startup delay t_STRT (max 300µs) applies once VDD exceeds this level.

Can the TPS3899DL41DSER monitor a voltage rail higher than its VDD supply?

Yes, the TPS3899DL41DSER can monitor rails up to 6.0V on the SENSE pin independently of VDD, which may be as low as 0.85V. This separation enables use cases like supervising a 3.3V or 5V system rail while powering the supervisor from a low-voltage auxiliary supply - a key feature confirmed in Section 3 Description and Table 5-1 Pin Functions of the SLVSFM0C datasheet.

What is the purpose of the hysteresis in the TPS3899DL41DSER, and how much is provided?

The TPS3899DL41DSER provides 5% typical hysteresis (V_HYS) around its negative-going threshold V_IT− to prevent oscillatory RESET toggling during slow or noisy rail transitions. For example, with V_IT− = 0.505V, hysteresis is ~25mV, meaning the rail must rise to ~0.530V to deassert RESET. This value is specified in Section 1 Features and Table 5-5 Electrical Characteristics, and is integral to reliable brown-out recovery.