Texas Instruments TLV863MDBZR

Overview

TLV863MDBZR from Texas Instruments is a 3-pin open-drain voltage supervisor IC designed for power-on reset generation and supply voltage monitoring in processor-based systems. It features a fixed 4.38 V negative-going threshold voltage (V_IT–), 200 ms reset delay time, 9 µA typical supply current, and operates across –40°C to +125°C. It is used in factory automation and electricity metering to ensure reliable system initialization during brownout or power-up events.

For engineers reviewing the TLV863MDBZR datasheet, TLV863MDBZR pinout, TLV863MDBZR application, or TLV863MDBZR equivalent, this page delivers verified functional identity, precise threshold and timing specs, SOT-23 package mapping, confirmed pin roles, and two validated alternative parts with documented technical and application differences.

Technical Context

The TLV863MDBZR implements a precision bandgap-based voltage comparator with internal hysteresis (60 mV) and an integrated 200 ms timer to generate a clean, glitch-free active-low reset pulse after V_DD exceeds 4.38 V. Its open-drain RESET output supports wired-OR configurations and level shifting up to 6 V independent of V_DD.

It asserts RESET when V_DD falls below 4.38 V and holds it low for ≥120 ms (min) after V_DD recovers above threshold-ensuring robust immunity to fast transients (t_w ≥ 10 µs). The device enters high-impedance state below 1.1 V V_DD, enabling safe operation during deep undervoltage conditions.

Key Specifications

Pinout & Package

SOT-23 (DBZ) package, 2.92 mm × 1.30 mm body size, 3-pin surface-mount configuration with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV863MDBZR, TLV803MDBZR demands PCB rework due to pin order mismatch, whereas TLV853MDBZR offers seamless drop-in replacement with identical pinout, timing, and thermal performance-making it the preferred alternative for production continuity.

Availability

TLV863MDBZR is available at Aetrix Electronics and suitable for factory automation, electricity metering, and building automation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TLV863MDBZR 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 microcontroller solutions.

The TLV8x3 family-including TLV863MDBZR-is engineered for high-reliability power supervision in industrial and infrastructure equipment, delivering precision voltage monitoring and deterministic reset timing without external components.

FAQ

What is the exact threshold voltage of the TLV863MDBZR?

The TLV863MDBZR has a fixed negative-going input threshold voltage (V_IT–) of 4.38 V, with a guaranteed tolerance of ±0.10 V over the full –40°C to +125°C operating temperature range. This value is factory-trimmed and does not require external calibration. The TLV863MDBZR uses an internal resistor divider to set this threshold, making it stable across supply and temperature variations.

Does the TLV863MDBZR support level shifting on its RESET output?

Yes, the TLV863MDBZR's open-drain RESET output supports level shifting: the pin can be pulled up to any voltage between 1.8 V and 6 V, independent of the VDD supply voltage. For example, it can monitor a 3.3 V rail while driving a 5 V logic interface-enabling interoperability across mixed-voltage systems without additional level translators.

Is the TLV863MDBZR pin-compatible with the TLV803 series?

The TLV863MDBZR shares the same SOT-23 (DBZ) package and pin count as the TLV803 series but uses a distinct pinout: Pin 1 = RESET, Pin 2 = GND, Pin 3 = VDD. In contrast, TLV803MDBZR uses Pin 1 = VDD, Pin 2 = GND, Pin 3 = RESET. Therefore, TLV863MDBZR is not pin-compatible with TLV803MDBZR but is pin-compatible with TLV853MDBZR.

What is the minimum supply voltage required for TLV863MDBZR to assert a valid RESET signal?

The TLV863MDBZR begins asserting a valid RESET signal when VDD rises above 1.1 V-the power-up reset voltage. Below this level, the internal circuitry is inactive and the RESET pin enters high-impedance state. This ensures predictable behavior during deep undervoltage conditions and avoids metastability during slow-ramp power-up sequences.

How does the TLV863MDBZR handle fast voltage transients on the VDD line?

The TLV863MDBZR incorporates built-in transient rejection: it ignores voltage dips shorter than 10 µs (t_w) regardless of amplitude, and only responds to longer-duration events that breach the 4.38 V threshold. This prevents false resets caused by switching regulator noise or ESD-induced glitches, as confirmed in the device's switching characteristics table and functional block diagram.