Texas Instruments TLV803ED18DPWR

Overview

TLV803ED18DPWR from Texas Instruments is an open-drain, active-low voltage supervisor IC designed for reliable power-on reset and brownout detection in ultra-low-power systems. It features a fixed 1.8 V threshold (±0.5% typical accuracy), 250 nA typical supply current, 40 µs reset delay, and operates across –40°C to +125°C - enabling use in battery-powered IoT sensors and industrial edge controllers.

For engineers reviewing the TLV803ED18DPWR datasheet, TLV803ED18DPWR pinout, TLV803ED18DPWR application, or TLV803ED18DPWR equivalent, key selection criteria include its X2SON-5 (DPW) package footprint, guaranteed RESET assertion down to 0.7 V VDD, integrated glitch immunity (10 µs), and compatibility with manual reset (MR) input for system-level fault recovery.

Technical Context

The TLV803ED18DPWR implements a precision bandgap-referenced comparator with built-in hysteresis (1.2% typical) to prevent oscillatory reset behavior during slow-rising or noisy supply rails. Its internal timer ensures a fixed 40 µs reset pulse width after VDD recovers above the rising threshold (VIT+ = VIT– + VHYS).

Unlike push-pull variants, this open-drain output requires an external pull-up resistor but supports mixed-voltage interface logic (e.g., 3.3 V MCU monitoring 1.8 V rail). The MR pin enables active-low manual reset initiation with 500 ns minimum pulse width, and the thermal pad (Pin 3) improves PCB heat dissipation without requiring electrical connection.

Key Specifications

Pinout & Package

X2SON-5 (DPW) package: 0.8 mm × 0.8 mm, 0.35 mm height, thermal pad (Pin 3) for enhanced thermal performance. Pin 1 = RESET, Pin 2 = VDD, Pin 3 = PAD (thermal, optional GND), Pin 4 = GND, Pin 5 = MR.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803ED18DPWR, TLV803ED18DBVR trades MR capability and miniaturization for lower unit cost and simpler layout, while MAX803SUR18+T offers pin compatibility with older designs but sacrifices low-power performance and extended temperature support.

Availability

TLV803ED18DPWR is available at Aetrix Electronics and suitable for industrial sensor nodes, low-power MCU power sequencing, smart meter backup power switchover, and automotive body control modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TLV803ED18DPWR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in power management, signal chain, and microcontrollers.

The TLV803E family was engineered specifically for ultra-low-power, high-accuracy voltage supervision in space- and energy-constrained applications - emphasizing sub-µA operation, factory-trimmed thresholds, and miniature packaging without sacrificing reliability.

FAQ

What is the minimum supply voltage at which TLV803ED18DPWR guarantees a valid RESET output state?

The TLV803ED18DPWR guarantees a defined RESET output state down to VPOR = 700 mV. Below this voltage, the output becomes undefined - a critical design boundary for battery-powered systems nearing end-of-life. This specification ensures predictable behavior during deep brownout, and TLV803ED18DPWR maintains this guarantee across its full –40°C to +125°C operating range.

Does TLV803ED18DPWR require an external pull-up resistor on the RESET pin?

Yes, TLV803ED18DPWR uses an open-drain output topology and requires an external pull-up resistor to establish the high logic level. Typical values range from 10 kΩ to 100 kΩ, connected between RESET and the target logic supply (e.g., 3.3 V). No pull-up is needed for push-pull variants like TLV809E, but TLV803ED18DPWR relies on this external component for proper interface operation.

How does the MR (manual reset) pin function on TLV803ED18DPWR?

The MR pin on TLV803ED18DPWR is an active-low input that forces RESET assertion when pulled below VMR_L (≤0.4 V). A minimum pulse width of 500 ns is required. After release, RESET remains asserted for the full 40 µs delay before deasserting. Unlike DBZ-packaged variants, the DPW version includes an internal 100 kΩ pull-up resistor on MR, simplifying system-level reset button implementation.

What is the thermal pad (Pin 3) on the X2SON-5 package used for in TLV803ED18DPWR?

The thermal pad (Pin 3) on TLV803ED18DPWR's X2SON-5 package serves solely for thermal dissipation and has no electrical function. It may be left floating or soldered to a GND plane to reduce junction-to-board thermal resistance (RθJB = 320.4°C/W). Doing so improves long-term reliability in high-ambient-temperature applications but does not affect electrical performance or pinout functionality.

Can TLV803ED18DPWR monitor a 1.8 V rail while powered from a higher voltage such as 3.3 V?

No - TLV803ED18DPWR monitors and is powered from the same VDD pin; it cannot supervise an independent rail. Its 1.8 V threshold applies to the voltage present at its own VDD terminal. To monitor a separate 1.8 V domain while powered from 3.3 V, a different architecture (e.g., resistive divider + supervisor with higher threshold) would be required. TLV803ED18DPWR is designed for direct connection to the rail it supervises.