Texas Instruments TLV803EA43DCKR

Overview

TLV803EA43DCKR 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 4.38 V threshold voltage (±0.5% typical accuracy), 50 ms fixed reset delay, 250 nA typical supply current, and operates across –40°C to +125°C - enabling use in battery-powered industrial sensors and portable medical devices.

For engineers reviewing the TLV803EA43DCKR datasheet, TLV803EA43DCKR pinout, TLV803EA43DCKR application, or TLV803EA43DCKR equivalent, key selection criteria include its SC-70 (DCK) 3-pin package, guaranteed RESET assertion down to 0.7 V VDD, integrated glitch immunity (10 µs), and compatibility with FPGA/ASIC power sequencing requirements.

Technical Context

The TLV803EA43DCKR implements a precision bandgap-referenced comparator with built-in hysteresis (0.9–1.5% of VIT–) to prevent chatter during slow-rising or noisy supply rails. Its internal timer ensures a precise 50 ms reset pulse width after VDD exceeds the rising threshold (VIT+ = VIT– + VHYS).

As an open-drain device, it requires an external pull-up resistor on the RESET pin and supports logic-level compatibility with 1.7–6 V VDD. It delivers defined output states down to VPOR = 0.7 V and includes integrated glitch immunity that rejects transients shorter than 10 µs at 5% overdrive.

Key Specifications

Pinout & Package

TLV803EA43DCKR is housed in a 3-pin SC-70 (DCK) package (2.00 mm × 1.25 mm body), optimized for space-constrained PCB layouts. Pin 1 = RESET, Pin 2 = GND, Pin 3 = VDD - standard pinout compatible with automated assembly and legacy SOT-23 footprint adapters.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EA43DCKR, TLV803EA43DBVR offers identical supervision performance in a larger, mechanically distinct package, while MAX809SEUR+T trades accuracy, power, and noise immunity for lower unit cost - making TLV803EA43DCKR optimal for space-constrained, long-life, and high-reliability designs.

Availability

TLV803EA43DCKR is available at Aetrix Electronics and suitable for electricity meters, portable medical devices, and factory automation sensors requiring stable component supply across extended product lifecycles.

Supply support for TLV803EA43DCKR 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, embedded processing, and power management technologies, with decades of expertise in high-reliability industrial and automotive ICs.

The TLV803E series belongs to TI's precision low-power voltage supervisor product line, engineered specifically for battery-operated and thermally demanding applications where accuracy, ultra-low IQ, and robustness against supply transients are mandatory.

FAQ

What is the exact reset threshold voltage of TLV803EA43DCKR?

The TLV803EA43DCKR has a factory-programmed falling threshold voltage (VIT–) of 4.38 V, with ±0.5% typical accuracy over –40°C to +125°C. This value is laser-trimmed during production and confirmed in TI's SLVSES2J datasheet Section 7.5. The rising threshold (VIT+) equals VIT– plus hysteresis (0.9–1.5% of VIT–), ensuring noise-immune release behavior. TLV803EA43DCKR does not support adjustable thresholds.

Does TLV803EA43DCKR require an external pull-up resistor on the RESET pin?

Yes, TLV803EA43DCKR uses an open-drain, active-low output and requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V). Typical values range from 10 kΩ to 100 kΩ depending on rise time and bus capacitance. Unlike push-pull variants (e.g., TLV809E), TLV803EA43DCKR cannot drive high actively - the pull-up defines the asserted logic level and sink current capability.

What is the guaranteed minimum supply voltage for TLV803EA43DCKR to assert a valid RESET signal?

TLV803EA43DCKR guarantees functional RESET assertion down to VPOR = 0.7 V, meaning the output state remains controlled and predictable even during deep brownout or cold-start conditions. Below 0.7 V, the RESET output becomes undefined. This specification is validated per Section 7.5 of the datasheet and enables reliable operation in ultra-low-voltage battery scenarios where other supervisors fail.

How does the 50 ms reset delay of TLV803EA43DCKR behave across temperature?

The 50 ms reset delay (variant D) of TLV803EA43DCKR has a specified range of 33–67 ms over –40°C to +125°C, with typical variation of ±1% across temperature. Figure 7-23 in the datasheet confirms minimal drift - e.g., ~50.2 ms at 25°C and ~50.5 ms at 125°C. This tight tolerance ensures consistent MCU boot timing regardless of ambient or self-heating conditions.

Is TLV803EA43DCKR pin-compatible with legacy MAX803/809-series supervisors?

TLV803EA43DCKR is pin-to-pin compatible with MAX803/809 in SC-70 (DCK) and SOT-23-3 packages per TI's documentation, but only for functionally equivalent variants (e.g., same threshold and delay). However, TLV803EA43DCKR offers superior specs: ±0.5% vs ±2.5% threshold accuracy, 250 nA vs 140 µA IQ, and integrated 10 µs glitch immunity - making it a drop-in upgrade where enhanced reliability is needed.