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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Texas Instruments TPS3808G125DBVR

Name: TPS3808G125DBVR
Brand: Texas Instruments
SKU: TPS3808G125DBVR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS3808G125DBVR

Manufacturer:: Texas Instruments

Category:: Supervisors

Package:: SOT-23-6

Datasheet:: TPS3808G125DBVR.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-6

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Product details

Overview

TPS3808G125DBVR from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 1.25 V system rails and assert an open-drain RESET signal when the SENSE voltage drops below 1.16 V. It delivers 0.5% threshold accuracy, 2.4 μA typical supply current, and user-adjustable reset delay from 1.25 ms to 10 s via external capacitor on CT pin-enabling reliable power-on reset in battery-powered microcontroller systems.

For engineers reviewing the TPS3808G125DBVR datasheet, TPS3808G125DBVR pinout, TPS3808G125DBVR application, or TPS3808G125DBVR equivalent, key selection criteria include its fixed 1.25 V nominal monitoring threshold (1.16 V actual V_IT), SOT-23-6 package compatibility, –40°C to 125°C operating range, and open-drain RESET output requiring external pull-up for interfacing with DSPs, FPGAs, or ASICs.

Technical Context

The TPS3808G125DBVR implements a precision voltage comparator with built-in hysteresis (1%–2.5% of V_IT) and an on-chip 220 nA current source that charges the external CT capacitor to generate the reset delay. Its SENSE input monitors the 1.25 V rail directly without external divider, while MR provides asynchronous manual reset with 90 kΩ internal pull-up.

It operates across 1.7 V to 6.5 V supply range, maintains 2.4 μA typical IDD at 3.3 V, and asserts RESET as an open-drain output with VOL ≤ 0.4 V at 1 mA load-ensuring clean deassertion timing after both SENSE > V_IT + V_HYS and MR high are satisfied for the full delay period.

Key Specifications

Parameter	Value and Actual Design Meaning
Threshold Voltage (V_IT)	1.16 V ±0.5% - precisely matches 1.25 V rail with minimal tolerance drift over temperature.
Quiescent Current (I_DD)	2.4 μA typical at 3.3 V - enables multi-year operation in coin-cell–powered IoT sensors.
Reset Delay Range	1.25 ms to 10 s - set by CT capacitor (≥100 pF); open CT = 20 ms, CT-to-VDD = 300 ms.
Operating Temperature	–40°C to 125°C - fully specified for automotive under-hood and industrial embedded environments.
Output Type	Open-drain RESET - supports level-shifting up to 6.5 V with external pull-up resistor (10 kΩ–1 MΩ).
Supply Voltage Range	1.7 V to 6.5 V - accommodates wide-input DC-DC outputs and battery discharge profiles.
SENSE Input Bias Current	±25 nA max - minimizes loading error on low-current 1.25 V reference or LDO feedback nodes.

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant NIPDAU/SN finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1: RESET	Open-drain output	Asserts low during reset; requires external pull-up; sinks up to 5 mA; compatible with 1.8 V/3.3 V/5 V logic domains.
2: GND	Ground reference	Primary return path for internal circuitry and CT capacitor discharge; must connect to low-impedance system ground plane.
3: MR	Manual reset input	Active-low; internally pulled up to VDD (90 kΩ); drives RESET low immediately when pulled below 0.3×VDD.
4: CT	Delay timing control	Connects to external capacitor (≥100 pF) to program delay; open = 20 ms, tied to VDD = 300 ms, capacitor = 1.25 ms–10 s.
5: SENSE	Monitoring input	Direct connection to 1.25 V rail; comparator triggers at 1.16 V; 25 nA bias current avoids disturbing sensitive voltage nodes.
6: VDD	Power supply input	Accepts 1.7–6.5 V; requires 0.1 μF ceramic decoupling capacitor placed adjacent to pin per layout guidelines.

Key Features

Feature	Design Value
Precision 1.25 V rail monitoring	Factory-trimmed 1.16 V threshold with 0.5% accuracy ensures reliable detection of 1.25 V LDO dropout or brownout.
Ultra-low quiescent current	2.4 μA typical IDD allows integration into always-on subsystems without compromising battery life.
Programmable reset delay	Single external capacitor sets delay from 1.25 ms to 10 s-eliminates need for discrete RC networks or timers.
Integrated manual reset	MR pin with 90 kΩ internal pull-up simplifies system-level reset coordination without external components.
High-temperature operation	Full functionality from –40°C to 125°C junction temperature supports automotive and industrial deployment.

Applications

Microcontroller Power Sequencing	FPGA Configuration Integrity
Use Scenario: Ensures stable 1.25 V core voltage before releasing reset to ARM Cortex-M or RISC-V MCU during cold start or wake-from-sleep. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset with 20 ms fixed delay (CT open) to meet processor t_POR requirements. Use Value: Prevents MCU lockup by guaranteeing VDD ≥ 1.25 V × 0.925 (1.16 V) for ≥20 ms prior to release.	Use Scenario: Monitors 1.25 V auxiliary rail powering FPGA configuration memory and I/O banks during power-up. IC Role / Device Role / Timing Role: Asserts open-drain RESET until rail stabilizes, then holds reset active for user-programmed delay (e.g., 100 ms) to allow slow-start regulators. Use Value: Eliminates bitstream corruption by enforcing minimum power-good hold time before FPGA begins configuration.
Battery-Powered Sensor Node	Industrial PLC I/O Module
Use Scenario: Provides watchdog-free power supervision for LoRaWAN node powered by CR2032 cell with 1.25 V buck converter output. IC Role / Device Role / Timing Role: Low-I_DD supervisor detecting 1.25 V rail collapse due to battery depletion or load surge. Use Value: Extends usable battery life beyond 5 years by consuming only 2.4 μA continuously while maintaining accurate brownout detection.	Use Scenario: Guards 1.25 V isolated ADC reference supply in DIN-rail mounted PLC module exposed to 85°C ambient. IC Role / Device Role / Timing Role: High-temp-rated supervisor asserting RESET if reference voltage dips below 1.16 V during EMI transients or thermal stress. Use Value: Maintains measurement integrity by triggering system reset before ADC offset errors exceed 0.1% FS.

Microcontroller Power Sequencing

FPGA Configuration Integrity

Use Scenario: Ensures stable 1.25 V core voltage before releasing reset to ARM Cortex-M or RISC-V MCU during cold start or wake-from-sleep.

IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset with 20 ms fixed delay (CT open) to meet processor t_POR requirements.

Use Value: Prevents MCU lockup by guaranteeing VDD ≥ 1.25 V × 0.925 (1.16 V) for ≥20 ms prior to release.

Use Scenario: Monitors 1.25 V auxiliary rail powering FPGA configuration memory and I/O banks during power-up.

IC Role / Device Role / Timing Role: Asserts open-drain RESET until rail stabilizes, then holds reset active for user-programmed delay (e.g., 100 ms) to allow slow-start regulators.

Use Value: Eliminates bitstream corruption by enforcing minimum power-good hold time before FPGA begins configuration.

Battery-Powered Sensor Node

Industrial PLC I/O Module

Use Scenario: Provides watchdog-free power supervision for LoRaWAN node powered by CR2032 cell with 1.25 V buck converter output.

IC Role / Device Role / Timing Role: Low-I_DD supervisor detecting 1.25 V rail collapse due to battery depletion or load surge.

Use Value: Extends usable battery life beyond 5 years by consuming only 2.4 μA continuously while maintaining accurate brownout detection.

Use Scenario: Guards 1.25 V isolated ADC reference supply in DIN-rail mounted PLC module exposed to 85°C ambient.

IC Role / Device Role / Timing Role: High-temp-rated supervisor asserting RESET if reference voltage dips below 1.16 V during EMI transients or thermal stress.

Use Value: Maintains measurement integrity by triggering system reset before ADC offset errors exceed 0.1% FS.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS3808G12DBVR	1.2 V nominal threshold (1.12 V V_IT); identical pinout, specs, and package.	Designed for 1.2 V core rails; not suitable for strict 1.25 V monitoring where 40 mV margin matters.	Select TPS3808G125DBVR when monitoring 1.25 V supplies requiring 1.16 V trip point; use TPS3808G12DBVR only for 1.2 V systems.
MAX6326UT125+T	Fixed 1.25 V threshold, 3 μA I_DD, 200 ms fixed delay, SOT-23-5 package (no MR pin).	Lacks manual reset input and programmable delay; limited to simple POR without system-level reset coordination.	Choose MAX6326UT125+T only for cost-sensitive, space-constrained designs needing basic 1.25 V POR without MR or delay flexibility.

Compared with TPS3808G12DBVR, the TPS3808G125DBVR provides tighter alignment to 1.25 V rails; compared with MAX6326UT125+T, it adds MR functionality and delay programmability at the cost of one extra pin and slightly higher complexity.

Availability

TPS3808G125DBVR is available at Aetrix Electronics and suitable for microcontroller power sequencing, FPGA configuration integrity, battery-powered sensor nodes, industrial PLC I/O modules, and portable computing applications requiring stable component supply across extended temperature ranges.

Supply support for TPS3808G125DBVR 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS3808 family was engineered specifically for ultra-low-power, high-accuracy voltage supervision in space- and energy-constrained embedded systems-emphasizing precision threshold matching, programmable timing, and robust operation across harsh thermal environments.

FAQ

What is the exact threshold voltage of the TPS3808G125DBVR?

The TPS3808G125DBVR has a nominal 1.25 V monitoring capability with a precise factory-trimmed threshold voltage (V_IT) of 1.16 V ±0.5% over –40°C to 125°C. This value is confirmed in TI's SBVS050M datasheet Table 5 and ensures accurate detection of 1.25 V rail brownout conditions without external resistor dividers.

How do I configure the reset delay time for the TPS3808G125DBVR?

The TPS3808G125DBVR reset delay is configured via the CT pin: leave CT open for 20 ms, tie CT to VDD through a 40–200 kΩ resistor for 300 ms, or connect CT to GND through a capacitor ≥100 pF for user-programmable delays from 1.25 ms to 10 s. The delay is generated by an internal 220 nA current source charging the capacitor to 1.23 V.

Does the TPS3808G125DBVR require an external pull-up resistor on the RESET pin?

Yes, the TPS3808G125DBVR features an open-drain RESET output and requires an external pull-up resistor (10 kΩ to 1 MΩ) to the desired logic voltage (up to 6.5 V). This enables level-shifting and ensures proper high-state assertion when RESET is deasserted-critical for interfacing with diverse microcontrollers and FPGAs.

Can the TPS3808G125DBVR monitor voltages other than 1.25 V?

No-the TPS3808G125DBVR is a fixed-threshold device optimized exclusively for 1.25 V rails (1.16 V V_IT). For adjustable or alternate thresholds, TI offers variants like TPS3808G01 (adjustable down to 0.405 V) or TPS3808G33 (3.3 V). Using TPS3808G125DBVR outside its specified 1.25 V application violates its design intent and datasheet guarantees.

What package and footprint does the TPS3808G125DBVR use?

The TPS3808G125DBVR uses the SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body size, 0.95 mm maximum height, gull-wing leads, and RoHS-compliant NIPDAU/SN finish. Its pinout matches standard SOT-23-6 layouts, enabling drop-in replacement in existing designs using compatible footprints.

TPS3808G125DBVR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: SOT-23-6

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 1.16V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: Adjustable/Selectable

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-6

TPS3808G125DBVR FAQ

1.How can I place an order for TPS3808G125DBVR through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS3808G125DBVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TPS3808G125DBVR reliable?

The price and inventory of TPS3808G125DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3808G125DBVR is usually 5 days.

3.What payment methods are accepted for TPS3808G125DBVR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3808G125DBVR transactions.

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4.How is shipping managed for TPS3808G125DBVR?

TPS3808G125DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS3808G125DBVR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TPS3808G125DBVR?

For technical support, including TPS3808G125DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3808G125DBVR requirements.

6.How does Aetrix verify that TPS3808G125DBVR is sourced from the original manufacturer or authorized distributors?

All TPS3808G125DBVR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS3808G125DBVR meets industry standards.

7.What is the process for return or replacement of TPS3808G125DBVR?

All TPS3808G125DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3808G125DBVR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TPS3808G125DBVR part is unused and in its original packaging.

Return procedure for TPS3808G125DBVR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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