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Texas Instruments TPS3840PL40DBVRQ1
- Part No.:
- TPS3840PL40DBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL40DBVRQ1.pdf
- Description:
- AUTOMOTIVE HIGH-INPUT VOLTAGE SU
- Quantity:
- Payment:
- Shipping:
Inventory:2,980
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Product details
Overview
TPS3840PL40DBVRQ1 from Texas Instruments is an automotive-grade nano-IQ voltage supervisor with push-pull active-low RESET output, 4.0 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 and brownout detection in automotive infotainment and ADAS domain controllers.
For engineers reviewing the TPS3840PL40DBVRQ1 datasheet, TPS3840PL40DBVRQ1 pinout, TPS3840PL40DBVRQ1 application, or TPS3840PL40DBVRQ1 equivalent, this page delivers verified electrical specs, validated pin functions, confirmed AEC-Q100 Grade 1 qualification, and real-world automotive use context - all derived from TI's production data sheet SNVSBA1B (Rev. B, April 2020).
Technical Context
The TPS3840PL40DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis (200 mV typical for VIT− = 4.0 V) and glitch-immune VDD sensing. Its internal state machine asserts RESET when VDD falls below 4.0 V or MR is pulled low, and deasserts only after VDD rises above 4.2 V and the CT-programmed delay expires.
It features a dedicated CT pin with 500 kΩ internal resistance (typical) enabling precise RC-based timing (50 µs–6.2 s), plus integrated MR pull-up (100 kΩ) and low-propagation-delay logic (tP_HL = 30 µs typ) - optimized for fast, deterministic reset sequencing in safety-critical automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 4.0 V ±1.5% (max) - ensures accurate brownout detection at nominal 3.3 V or 5 V rails without external resistive dividers. |
| IDD Quiescent Current | 350 nA (typ), 700 nA (max) - enables multi-year battery backup operation in always-on automotive modules. |
| RESET Output Type | Push-pull, active-low - eliminates need for external pull-up resistor, reduces BOM count and board space. |
| tD Reset Delay Range | 50 µs (CT open) to 6.2 s (CT = 10 µF) - supports flexible power sequencing across SoC, memory, and peripheral initialization. |
| tP_HL Propagation Delay | 30 µs (typ) - guarantees rapid response to supply faults, meeting ASIL-B timing constraints in functional safety designs. |
| Ambient Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and cockpit electronics deployment. |
| Hysteresis (VHYS) | 200 mV (typ) - prevents chatter during slow-rising/falling VDD transitions near threshold. |
Pinout & Package
TPS3840PL40DBVRQ1 uses the industry-standard 5-pin SOT-23 (DBV) package (2.90 mm × 1.60 mm), optimized for high-density automotive PCB layouts and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull output | Drives low to assert reset; actively pulls high to release - no external pull-up required; sinks ≥2 mA at VDD ≤5 V. |
| 2 - VDD | Supply and monitored rail input | Monitors itself: detects drop below 4.0 V; powers internal circuitry; operates from 1.5 V to 10 V. |
| 3 - GND | Analog/digital ground reference | Common return path for VDD, MR, CT, and RESET; must be low-impedance for noise immunity. |
| 4 - MR | Active-low manual reset input | Pull low to force RESET assertion; internally pulled up to VDD (100 kΩ); floating = disabled. |
| 5 - CT | Capacitor time-delay programming node | Connect external capacitor to GND to set tD; internal 500 kΩ RCT defines RC time constant; floating = 50 µs min delay. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation, HBM ±2 kV, CDM ±750 V - meets automotive reliability requirements out-of-box. |
| Programmable reset delay via CT pin | Enables precise, layout-adjustable power sequencing (50 µs–6.2 s) without firmware or additional ICs. |
| 1% typical VIT− accuracy | Reduces margining overhead in system-level voltage tolerance budgets - critical for 1.8 V/3.3 V core rail monitoring. |
| Glitch-immune VDD sensing | Rejects transients ≤10 µs (at 5% overdrive), preventing false resets during load-dump or coupling events. |
| Low-power POR with 300 mV VPOR | Guarantees known RESET state during ultra-slow VDD ramp-up (≤100 mV/µs), essential for battery-backed systems. |
Applications
| Automotive Head Unit Power Sequencing | ADAS Domain Controller Brownout Protection |
|---|---|
Use Scenario: Coordinating startup of SoC, display driver, and audio codec after ignition. IC Role / Device Role / Timing Role: Monitors 3.3 V I/O rail; asserts RESET until stable; delays release by 100 ms via 100 nF CT capacitor. Use Value: Prevents firmware lockup from partial initialization; eliminates need for discrete RC network or microcontroller polling. |
Use Scenario: Detecting undervoltage on 5 V sensor supply during engine cranking. IC Role / Device Role / Timing Role: Supervises VCORE rail; triggers immediate RESET on dip below 4.0 V; deasserts only after 500 ms hold-off. Use Value: Ensures deterministic recovery from cranking-induced brownouts without requiring safety MCU intervention. |
| Telematics Control Unit (TCU) Watchdog Coordination | Automotive Instrument Cluster Voltage Monitoring |
Use Scenario: Providing hardware reset signal synchronized with cellular modem wake-up sequence. IC Role / Device Role / Timing Role: Uses MR pin to accept watchdog timeout pulse from baseband processor; adds 200 ms delay before releasing RESET. Use Value: Enables fail-safe modem restart without software coordination; avoids race conditions between modem and host MCU. |
Use Scenario: Monitoring 1.8 V microcontroller core supply in digital gauge cluster. IC Role / Device Role / Timing Role: Detects VDD collapse below 4.0 V (via resistor divider); asserts RESET within 30 µs; holds for 50 ms. Use Value: Guarantees clean restart of cluster MCU during battery voltage sag - critical for functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840DL40DBVRQ1 | Open-drain active-low RESET output; requires external pull-up resistor; identical VIT−, IDD, and timing specs. | Suitable where bus-sharing or wired-AND reset logic is needed; not compatible with direct drive of CMOS inputs without pull-up. | Select when system architecture mandates open-drain topology or shared reset busing. |
| MAX6326LT40D2T | Fixed 4.0 V threshold, but higher IDD (1.2 µA typ), no MR pin, no programmable delay; SOT-23-3 package. | Limited to simple POR-only use cases; lacks manual reset and timing flexibility - insufficient for complex sequencing. | Choose only for cost-sensitive, non-automotive applications where MR and delay are unnecessary. |
Compared with TPS3840DL40DBVRQ1, the TPS3840PL40DBVRQ1 eliminates external components and simplifies layout; versus MAX6326LT40D2T, it delivers automotive qualification, lower IQ, and full sequencing control - making it the optimal choice for modern vehicle ECU designs.
Availability
TPS3840PL40DBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, ADAS domain controllers, telematics control units, and instrument clusters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS3840PL40DBVRQ1 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 ICs, with decades of automotive qualification expertise and broad manufacturing scale.
The TPS3840-Q1 product line was designed specifically for AEC-Q100-compliant voltage supervision in automotive infotainment, ADAS, and body electronics - prioritizing nano-power operation, high accuracy, and robust transient immunity.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840PL40DBVRQ1?
The TPS3840PL40DBVRQ1 has a factory-set negative-going input threshold (VIT−) of 4.0 V, with accuracy of ±1.5% maximum over –40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 200 mV (typical), resulting in a VIT+ of 4.2 V. This is confirmed in Section 7.5 of the TI datasheet SNVSBA1B.
Does the TPS3840PL40DBVRQ1 require an external pull-up resistor on the RESET pin?
No - the TPS3840PL40DBVRQ1 features a push-pull active-low RESET output, meaning it actively drives both high and low states. Unlike open-drain variants (e.g., TPS3840DL40DBVRQ1), it does not require an external pull-up resistor, reducing BOM count and improving noise immunity in automotive environments.
How is the reset delay time programmed on the TPS3840PL40DBVRQ1?
The reset delay (tD) is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With CT open, tD = 50 µs; with a 10 µF capacitor, tD ≈ 6.2 s. The internal CT resistance is 500 kΩ (typical), and the relationship follows tD = −ln(0.29) × RCT × CCT_EXT + 50 µs, per Section 8.3.2 of the datasheet.
Is the TPS3840PL40DBVRQ1 qualified for automotive applications?
Yes - the TPS3840PL40DBVRQ1 is AEC-Q100 qualified (Grade 1: –40°C to +125°C ambient), with HBM ESD rating ±2 kV and CDM rating ±750 V. It is explicitly designated "-Q1" and documented in TI's production data sheet SNVSBA1B as automotive-qualified, including thermal, reliability, and test reports.
What is the minimum supply voltage and quiescent current of the TPS3840PL40DBVRQ1?
The TPS3840PL40DBVRQ1 operates from 1.5 V to 10 V supply voltage and draws only 350 nA typical (700 nA maximum) quiescent current across the full temperature and voltage range. This ultra-low IQ enables multi-year operation in always-on automotive modules powered by backup batteries or energy-harvesting sources.
TPS3840PL40DBVRQ1 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:
- 4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- 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
TPS3840PL40DBVRQ1 FAQ
1.How can I place an order for TPS3840PL40DBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL40DBVRQ1 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 TPS3840PL40DBVRQ1 reliable?
The price and inventory of TPS3840PL40DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL40DBVRQ1 is usually 5 days.
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Once your TPS3840PL40DBVRQ1 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 TPS3840PL40DBVRQ1?
For technical support, including TPS3840PL40DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL40DBVRQ1 requirements.
6.How does Aetrix verify that TPS3840PL40DBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3840PL40DBVRQ1 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 TPS3840PL40DBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3840PL40DBVRQ1?
All TPS3840PL40DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL40DBVRQ1, 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 TPS3840PL40DBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3840PL40DBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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