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

Texas Instruments TPS3840PH27DBVRQ1

Name: TPS3840PH27DBVRQ1
Brand: Texas Instruments
SKU: TPS3840PH27DBVRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS3840PH27DBVRQ1

Manufacturer:: Texas Instruments

Category:: Supervisors

Package:: SC-74A, SOT-753

Datasheet:: TPS3840PH27DBVRQ1.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-5

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Product details

Overview

TPS3840PH27DBVRQ1 from Texas Instruments is an automotive-grade nano-I_Q voltage supervisor with push-pull active-high RESET output, 2.7 V fixed threshold (±1.5% max), 350 nA typical quiescent current, and programmable capacitor-based reset delay up to 6.2 s - used for reliable power-on reset assertion in automotive infotainment and cluster microcontroller supply monitoring.

For engineers reviewing the TPS3840PH27DBVRQ1 datasheet, TPS3840PH27DBVRQ1 pinout, TPS3840PH27DBVRQ1 application, or TPS3840PH27DBVRQ1 equivalent, this page delivers verified electrical specs, validated SOT-23-5 pin functions, automotive AEC-Q100 Grade 1 qualification context, and real-world timing behavior including t_STRT ≤350 µs and t_{P_HL} = 30 µs typical.

Technical Context

The TPS3840PH27DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis (100 mV typ. for 2.7 V threshold) and glitch-immune VDD sensing. Its internal state machine asserts RESET high when VDD falls below 2.7 V or MR is pulled low, holding assertion for user-programmable t_D after VDD recovers above VIT+ and MR releases.

It uses a dedicated CT pin with 500 kΩ internal resistance to interface with external capacitors (0–10 µF), enabling precise reset hold times from 50 µs to 6.2 s. The push-pull active-high output drives directly without pull-up resistors and supports 2 mA sink/source at 1.5–5 V VDD.

Key Specifications

Parameter	Value and Actual Design Meaning
Threshold Voltage (V_IT−)	2.7 V ±1.5% max over −40°C to +125°C - ensures accurate detection of VCORE or I/O rail brownout in automotive environments.
Quiescent Current (I_DD)	350 nA typical, 700 nA max - enables always-on monitoring in battery-backed systems without measurable drain.
Reset Output Type	Push-pull, active-high - eliminates need for external pull-up resistor and guarantees fast, rail-to-rail logic-level assertion.
Startup Delay (t_STRT)	≤350 µs max - provides rapid system initialization after power ramp, critical for fast-booting automotive MCUs.
Propagation Delay (t_{P_HL})	30 µs typical - ensures deterministic response to VDD dips, supporting tight timing margins in safety-critical subsystems.
Hysteresis (V_HYS)	100 mV typical (V_IT− = 2.7 V) - prevents chatter during slow-rising/falling supply transitions near threshold.
Reset Delay Range (t_D)	50 µs (CT open) to 6.2 s (10 µF on CT) - allows flexible hold-time tuning for diverse processor reset requirements.

Pinout & Package

TPS3840PH27DBVRQ1 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained automotive PCB layouts and compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
1 - RESET	Active-high push-pull output	Drives high during reset assertion; sinks 2 mA minimum when low - interfaces directly with MCU nRESET pins requiring active-high logic.
2 - VDD	Supply and monitored input	Both powers the IC and serves as the sensed rail; operates from 1.5 V to 10 V with internal regulation.
3 - GND	Reference ground	Common return path for VDD, MR, CT, and RESET; must be low-impedance to ensure accurate threshold detection.
4 - MR	Active-low manual reset input	Pulling low forces immediate RESET assertion; floating or >0.7×VDD releases reset after t_D - enables hardware-initiated recovery.
5 - CT	Capacitor time-delay control	Connects to GND via external capacitor (0–10 µF) to set t_D; left open for minimal 50 µs delay - no resistor required.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for −40°C to +125°C ambient operation - meets automotive cockpit and head unit thermal requirements.
Nano-I_Q supply current	350 nA typical - enables permanent connection to battery rails without compromising standby life in telematics modules.
Programmable reset delay	50 µs to 6.2 s via single external capacitor - replaces discrete RC networks and simplifies BOM across platforms.
Glitch immunity on VDD	10 µs rejection window at 5% overdrive - suppresses noise-induced false resets in electrically noisy vehicle environments.
Push-pull active-high output	No external pull-up needed - reduces component count and improves rise/fall time vs. open-drain alternatives.

Applications

Automotive Head Unit Power Sequencing	ADAS Domain Controller Supervision
Use Scenario: Monitors 3.3 V I/O supply and 1.8 V core rail during cold crank and load dump events in infotainment head units. IC Role / Device Role / Timing Role: Asserts active-high RESET to MCU upon VDD dip below 2.7 V, holding for 200 ms (via 0.1 µF CT) to ensure full processor reset. Use Value: Prevents firmware lockup during engine start transients by guaranteeing clean, timed reset independent of software.	Use Scenario: Watches VCORE rail of radar processing SoC in driver-assistance domain controllers operating at 125°C junction temperature. IC Role / Device Role / Timing Role: Provides AEC-Q100-compliant supervision with 1% threshold accuracy and 100 mV hysteresis to avoid oscillation near rail limits. Use Value: Enables fail-safe shutdown before SoC enters undefined state - critical for ISO 26262 ASIL-B functional safety compliance.
Telematics Control Unit (TCU) Battery Backup	Automotive Digital Cluster Microcontroller Reset
Use Scenario: Maintains supervision of backup 3.0 V rail powered by supercapacitor during main battery disconnect in emergency call (eCall) modules. IC Role / Device Role / Timing Role: Draws only 350 nA while continuously monitoring; asserts RESET if backup voltage drops below 2.7 V. Use Value: Extends eCall operational window by minimizing parasitic drain - extends supercapacitor hold-up time by >15% vs. µA-class supervisors.	Use Scenario: Controls power-on reset timing for ARM Cortex-M7 MCU in digital instrument clusters with dual-rail (1.2 V/3.3 V) supplies. IC Role / Device Role / Timing Role: Generates 100 ms active-high RESET pulse using 0.22 µF CT capacitor, synchronized to 3.3 V rail stabilization. Use Value: Eliminates need for RC timing network and associated tolerance stack-up - improves reset timing repeatability across production lots.

Automotive Head Unit Power Sequencing

ADAS Domain Controller Supervision

Use Scenario: Monitors 3.3 V I/O supply and 1.8 V core rail during cold crank and load dump events in infotainment head units.

IC Role / Device Role / Timing Role: Asserts active-high RESET to MCU upon VDD dip below 2.7 V, holding for 200 ms (via 0.1 µF CT) to ensure full processor reset.

Use Value: Prevents firmware lockup during engine start transients by guaranteeing clean, timed reset independent of software.

Use Scenario: Watches VCORE rail of radar processing SoC in driver-assistance domain controllers operating at 125°C junction temperature.

IC Role / Device Role / Timing Role: Provides AEC-Q100-compliant supervision with 1% threshold accuracy and 100 mV hysteresis to avoid oscillation near rail limits.

Use Value: Enables fail-safe shutdown before SoC enters undefined state - critical for ISO 26262 ASIL-B functional safety compliance.

Telematics Control Unit (TCU) Battery Backup

Automotive Digital Cluster Microcontroller Reset

Use Scenario: Maintains supervision of backup 3.0 V rail powered by supercapacitor during main battery disconnect in emergency call (eCall) modules.

IC Role / Device Role / Timing Role: Draws only 350 nA while continuously monitoring; asserts RESET if backup voltage drops below 2.7 V.

Use Value: Extends eCall operational window by minimizing parasitic drain - extends supercapacitor hold-up time by >15% vs. µA-class supervisors.

Use Scenario: Controls power-on reset timing for ARM Cortex-M7 MCU in digital instrument clusters with dual-rail (1.2 V/3.3 V) supplies.

IC Role / Device Role / Timing Role: Generates 100 ms active-high RESET pulse using 0.22 µF CT capacitor, synchronized to 3.3 V rail stabilization.

Use Value: Eliminates need for RC timing network and associated tolerance stack-up - improves reset timing repeatability across production lots.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS3840PL27DBVRQ1	Same 2.7 V threshold and SOT-23-5 package, but push-pull active-low RESET output.	Requires MCU nRESET pin; incompatible with systems expecting active-high assertion without level-shifting.	Select when interfacing with legacy MCUs designed for active-low reset inputs - no change to timing or accuracy.
MAX6373HUT+T	2.7 V threshold, 1.2 µA I_DD, fixed 200 ms delay, SOT-23-5 - higher quiescent current, non-programmable delay.	Lacks CT pin programmability and nano-I_Q performance; suitable only where ultra-low power is not required.	Choose only for cost-sensitive non-battery applications where 200 ms fixed delay suffices and 3.4× higher I_DD is acceptable.

Compared with TPS3840PL27DBVRQ1, the TPS3840PH27DBVRQ1 enables direct active-high MCU interface without inversion logic; versus MAX6373HUT+T, it delivers 3.4× lower quiescent current and field-adjustable reset timing - essential for modern automotive low-power architectures.

Availability

TPS3840PH27DBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, digital instrument clusters, and telematics control units requiring stable component supply with AEC-Q100 qualification and long-term production support.

Supply support for TPS3840PH27DBVRQ1 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 automotive electronics, with decades of automotive qualification expertise and broad manufacturing scale.

The TPS3840-Q1 product line was engineered specifically for automotive power-supply monitoring - delivering nano-quiescent current, AEC-Q100 Grade 1 reliability, and programmable timing in industry-standard SOT-23 packages.

FAQ

What is the exact threshold voltage and accuracy of the TPS3840PH27DBVRQ1?

The TPS3840PH27DBVRQ1 has a factory-trimmed negative-going input threshold (V_IT−) of 2.7 V with ±1.5% maximum deviation across −40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 100 mV (typical) - ensuring robust detection of 2.7 V rail collapse without chatter during marginal conditions.

Does the TPS3840PH27DBVRQ1 require an external pull-up resistor on the RESET pin?

No. The TPS3840PH27DBVRQ1 features a push-pull active-high RESET output, meaning it actively drives both high and low states. Unlike open-drain variants, it requires no external pull-up resistor - simplifying layout and improving rise/fall time consistency across voltage rails.

How is the reset delay time programmed on the TPS3840PH27DBVRQ1?

Reset delay (t_D) is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, t_D = 50 µs; with 0.1 µF, t_D ≈ 200 ms; with 10 µF, t_D ≈ 6.2 s. The internal CT resistance is 500 kΩ (typical), and the relationship follows t_D = −ln(0.29) × R_CT × C_{CT_EXT} + 50 µs.

Is the TPS3840PH27DBVRQ1 qualified for automotive use?

Yes. The TPS3840PH27DBVRQ1 is AEC-Q100 qualified for Grade 1 (−40°C to +125°C ambient), with HBM ESD rating of ±2000 V and CDM rating of ±750 V. It is explicitly designed for automotive applications including head units, digital clusters, and telematics control units.

Can the MR pin be left unconnected in the TPS3840PH27DBVRQ1?

Yes. The MR pin has an internal 100 kΩ pull-up resistor and may be left floating when manual reset functionality is not required. When used, it must be driven below 600 mV (V_{MR_L}) to assert RESET, and released to >0.7×VDD to deassert after t_D. No external components are needed for basic operation.

TPS3840PH27DBVRQ1 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 2.7V

Output:: Push-Pull, Totem Pole

Reset:: Active High

Reset Timeout:: 619ms Typical

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

TPS3840PH27DBVRQ1 FAQ

1.How can I place an order for TPS3840PH27DBVRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS3840PH27DBVRQ1 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 TPS3840PH27DBVRQ1 reliable?

The price and inventory of TPS3840PH27DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PH27DBVRQ1 is usually 5 days.

3.What payment methods are accepted for TPS3840PH27DBVRQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3840PH27DBVRQ1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TPS3840PH27DBVRQ1?

TPS3840PH27DBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS3840PH27DBVRQ1 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 TPS3840PH27DBVRQ1?

For technical support, including TPS3840PH27DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PH27DBVRQ1 requirements.

6.How does Aetrix verify that TPS3840PH27DBVRQ1 is sourced from the original manufacturer or authorized distributors?

All TPS3840PH27DBVRQ1 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 TPS3840PH27DBVRQ1 meets industry standards.

7.What is the process for return or replacement of TPS3840PH27DBVRQ1?

All TPS3840PH27DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PH27DBVRQ1, 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 TPS3840PH27DBVRQ1 part is unused and in its original packaging.

Return procedure for TPS3840PH27DBVRQ1:

1.Submit a request within 90 days.

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

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