Texas Instruments TPS3808EG50DBVR

Overview

TPS3808EG50DBVR from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 5V power rails and assert an open-drain RESET signal upon undervoltage detection. It features 4.65V threshold accuracy (±0.5%), 0.6μA typical supply current, 20ms–10s user-adjustable reset delay, and operates across –40°C to +125°C for industrial and automotive-grade systems including DC-input BLDC motor drives and surgical equipment.

For engineers reviewing the TPS3808EG50DBVR datasheet, TPS3808EG50DBVR pinout, TPS3808EG50DBVR application, or TPS3808EG50DBVR equivalent, key selection criteria include its fixed 5V monitoring capability, SOT-23-6 package compatibility, manual reset (MR) input support, and ultra-low-power operation in battery-backed or thermally constrained embedded designs.

Technical Context

The TPS3808EG50DBVR implements a precision voltage comparator with 0.5% threshold accuracy referenced to an internal bandgap, enabling reliable 5V rail supervision. Its reset assertion logic responds to either SENSE voltage falling below 4.65V or MR pin being driven low, with hysteresis (1–2.5%) preventing chatter during threshold crossings.

Reset timing is determined by an on-chip 220nA current source charging an external capacitor at the CT pin - allowing delay configuration from 1.25ms to 10s - or fixed delays of 20ms (CT open) or 300ms (CT tied to VDD via 40–200kΩ resistor). The open-drain RESET output requires an external pull-up and supports voltages up to 6V.

Key Specifications

Pinout & Package

TPS3808EG50DBVR is housed in a compact 6-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts in motor drives and medical electronics.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with TPS3808G50DBVR, the TPS3808EG50DBVR provides guaranteed operation up to +125°C junction temperature - critical for motor drive and surgical applications - while both share identical 4.65V threshold and 0.6μA IQ. Against MAX6326LT50D3+, the TPS3808EG50DBVR offers 78% lower quiescent current, MR pin flexibility, and adjustable timing - enabling more robust, longer-life, and design-adaptable supervision.

Availability

TPS3808EG50DBVR is available at Aetrix Electronics and suitable for DC-input BLDC motor drives, electricity meters, rack server motherboards, and surgical equipment requiring stable component supply, long-term manufacturability, and AEC-Q100-aligned reliability.

Supply support for TPS3808EG50DBVR 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 microcontroller technologies.

The TPS3808E product line was developed specifically for ultra-low-power, high-accuracy voltage supervision in thermally demanding industrial and automotive systems - emphasizing precision threshold stability, flexible reset timing, and extended temperature operation.

FAQ

What is the exact threshold voltage and accuracy of the TPS3808EG50DBVR?

The TPS3808EG50DBVR has a nominal threshold voltage of 4.65V with ±0.5% accuracy over temperature (–40°C to +125°C). This value is factory-trimmed and specified in the Electrical Characteristics table of the official datasheet (SNVSCE0B), ensuring precise 5V rail monitoring without external calibration or resistor networks. The TPS3808EG50DBVR achieves this using a precision internal reference and comparator architecture.

Can the TPS3808EG50DBVR be used to monitor voltages other than 5V?

No - the TPS3808EG50DBVR is a fixed-threshold variant configured exclusively for 5V nominal rail supervision (VIT = 4.65V). To monitor other voltages, select alternate part numbers such as TPS3808EG33 (3.3V) or TPS3808EG01 (adjustable down to 0.405V). The TPS3808EG50DBVR does not support external resistor dividers for threshold adjustment; its internal reference is hard-coded for 4.65V detection.

How is the reset delay time set on the TPS3808EG50DBVR?

The reset delay time on the TPS3808EG50DBVR is set via the CT pin: leaving CT open yields a 20ms delay; connecting CT to VDD through a 40–200kΩ resistor gives 300ms; connecting CT to GND via a capacitor (130pF–150nF) enables user-programmable delays from 1.25ms to 10s. The TPS3808EG50DBVR uses an internal 220nA current source to charge the capacitor, and delay is calculated per Equation 1 in the datasheet. Stray capacitance must be minimized for accuracy.

Does the TPS3808EG50DBVR require an external pull-up resistor on the RESET pin?

Yes - the TPS3808EG50DBVR features an open-drain RESET output that requires an external pull-up resistor (10kΩ to 1MΩ) to a valid logic-high voltage (up to 6V). Without this resistor, the RESET signal cannot transition high and will remain undefined. The TPS3808EG50DBVR's RESET pin sinks current only when asserted; the pull-up defines the logic-high state and enables level-shifting above VDD, which is essential for interfacing with higher-voltage MCUs.

What is the maximum operating temperature and thermal specification for the TPS3808EG50DBVR?

The TPS3808EG50DBVR is fully specified from –40°C to +125°C junction temperature (TJ), with RθJA = 210.8°C/W for the SOT-23-6 (DBV) package. This rating is validated per JEDEC JESD51 standards and supports deployment in high-temperature environments such as motor drive power stages and surgical equipment enclosures. The TPS3808EG50DBVR's thermal performance allows direct mounting on PCBs without heatsinks under typical load conditions.