Texas Instruments TLV809EA45DCKR

Overview

TLV809EA45DCKR from Texas Instruments is a push-pull, active-low voltage supervisor IC designed for supply rail monitoring in ultra-low-power systems. It features a fixed 4.55 V under-voltage detection threshold (±0.5% typical accuracy), 50 ms reset time delay, 250 nA typical supply current at 3.3 V, and guaranteed operation down to 0.7 V VDD - enabling reliable power-on-reset in battery-powered microcontrollers and portable sensors.

For engineers reviewing the TLV809EA45DCKR datasheet, TLV809EA45DCKR pinout, TLV809EA45DCKR application, or TLV809EA45DCKR equivalent, this page delivers verified functional specifications, SC-70 package layout, real-world use cases in energy metering and industrial automation, and two validated alternative parts with documented technical and application differences.

Technical Context

The TLV809EA45DCKR implements a precision bandgap-referenced comparator with built-in hysteresis (1.2% typical) to prevent false resets during supply transients. Its glitch immunity filter rejects VDD excursions shorter than 10 µs, ensuring robust operation in electrically noisy environments like factory automation interfaces.

This device asserts an active-low RESET signal when VDD falls below 4.55 V and holds it for exactly 50 ms after VDD rises above the rising threshold (4.55 V + hysteresis). The push-pull output drives low to ≤300 mV at 500 µA sink current and high to ≥0.8×VDD at 2 mA source current - eliminating external pull-up requirements.

Key Specifications

Pinout & Package

TLV809EA45DCKR is housed in a 3-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained PCB layouts in portable electronics and sensor nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3809K33DBVR and MAX809SEUR+T, TLV809EA45DCKR delivers precise 4.55 V detection, 50 ms timing aligned with modern MCUs, and nanoamp-level current - making it optimal for next-generation portable and industrial systems where accuracy, speed, and energy efficiency are jointly critical.

Availability

TLV809EA45DCKR is available at Aetrix Electronics and suitable for electricity metering, factory automation, and portable medical equipment requiring stable component supply across extended product lifecycles.

Supply support for TLV809EA45DCKR 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 and embedded processing technologies, with decades of expertise in precision power management and signal chain solutions.

The TLV809E series belongs to TI's low-power voltage supervisor product line, engineered specifically for battery-operated and energy-sensitive applications demanding nanoscale quiescent current and high threshold accuracy.

FAQ

What is the exact reset threshold voltage of TLV809EA45DCKR?

The TLV809EA45DCKR has a factory-programmed falling threshold voltage (VIT–) of 4.55 V with ±0.5% typical accuracy over –40°C to +125°C. This value is laser-trimmed during production and does not require external calibration. The rising threshold (VIT+) equals 4.55 V plus hysteresis (typically 1.2% of VIT–), ensuring noise immunity during recovery.

Does TLV809EA45DCKR require an external pull-up resistor on the RESET pin?

No, TLV809EA45DCKR uses a push-pull output topology and does not require an external pull-up resistor. Its RESET pin actively drives high (≥0.8×VDD) when deasserted and low (≤300 mV at 500 µA) when asserted - providing a fully defined logic state across the entire 0.7 V to 6 V supply range.

What is the guaranteed minimum supply voltage for TLV809EA45DCKR to assert a valid RESET signal?

TLV809EA45DCKR guarantees a controlled output state down to VPOR = 700 mV. Below this voltage, the RESET output becomes undefined. This ensures reliable power-on-reset behavior during slow-ramping supplies and deep battery discharge scenarios where VDD may rise gradually from near-zero.

How does the 50 ms reset delay of TLV809EA45DCKR impact system startup timing?

The 50 ms fixed reset delay in TLV809EA45DCKR ensures the microcontroller remains held in reset long enough for internal oscillators, PLLs, and memory subsystems to stabilize after VDD exceeds 4.55 V. This matches typical tPOR requirements of ARM Cortex-M and RISC-V MCUs used in industrial and portable designs.

Is TLV809EA45DCKR compatible with existing MAX809 footprints?

No - TLV809EA45DCKR uses an SC-70 (DCK) 3-pin package (2.00 mm × 1.25 mm), while MAX809 variants use SOT-23-3 (2.90 mm × 1.30 mm). Though both are 3-pin supervisors, the smaller SC-70 footprint requires PCB layout revision. Pin functions (VDD, GND, RESET) are identical, but mechanical compatibility is not maintained.