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Texas Instruments TPS3840PL31DBVR
- Part No.:
- TPS3840PL31DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL31DBVR.pdf
- Description:
- NANOPOWER HIGH-INPUT VOLTAGE SUP
- Quantity:
- Payment:
- Shipping:
Inventory:2,943
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Product details
Overview
TPS3840PL31DBVR from Texas Instruments is an automotive-grade nano-IQ voltage supervisor with push-pull active-low RESET output, 3.1 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 TPS3840PL31DBVR datasheet, TPS3840PL31DBVR pinout, TPS3840PL31DBVR application, or TPS3840PL31DBVR equivalent, this page delivers verified functional identity, exact SOT-23-5 pin mapping, confirmed automotive AEC-Q100 Grade 1 qualification (–40°C to +125°C), and validated alternative options for voltage monitoring in safety-critical low-power systems.
Technical Context
The TPS3840PL31DBVR implements a precision bandgap-referenced comparator with built-in hysteresis (100 mV typ. for 3.1 V threshold) and glitch-immune VDD sensing. Its internal state machine enforces a minimum 50 µs reset assertion time and supports user-programmable delay via external CT-to-GND capacitor (50 µs to 6.2 s).
It features active-low manual reset (MR) with 0.7×VDD logic-high threshold and 600 mV logic-low threshold, plus push-pull output capable of sinking 2 mA at VOL ≤ 200 mV (VDD = 1.5–5 V) and sourcing 2–5 mA at VOH ≥ 0.8×VDD - eliminating need for external pull-up resistors in most designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 3.1 V ±1.5% max - ensures accurate brownout detection at nominal 3.3 V rail without calibration |
| IDD Quiescent Current | 350 nA typ., 700 nA max - enables multi-year battery operation in always-on automotive modules |
| Reset Output Type | Push-pull, active-low - drives RESET directly without external pull-up; compatible with MCU reset inputs requiring low-impedance assert |
| tD Programmable Delay | 50 µs (CT open) to 6.2 s (10 µF) - configurable reset hold time to meet processor POR timing requirements |
| VDD Operating Range | 1.5 V to 10 V - supports direct monitoring of 1.8 V, 3.3 V, 5 V, and 9 V rails without external divider |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C ambient) - qualified for under-hood and cockpit electronics per automotive reliability standard |
| Hysteresis (VHYS) | 100 mV typical - prevents chatter during slow-rising/falling supply transitions near threshold |
Pinout & Package
TPS3840PL31DBVR 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 reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives low during reset assertion; high-impedance release requires no external pull-up; sinks 2 mA @ VOL ≤ 200 mV |
| 2: VDD | Supply and monitored input | Both powers internal circuitry and serves as monitored rail; accepts 1.5–10 V; bypass capacitor recommended |
| 3: GND | Analog/digital ground reference | Common return for VDD, MR, CT, and RESET; must be low-impedance connection to system ground plane |
| 4: MR | Active-low manual reset input | Pull to ≤600 mV to force reset; floats or rises to ≥0.7×VDD to release after tD; internal 100 kΩ pull-up |
| 5: CT | Capacitor time-delay programming node | Connect external capacitor (0–10 µF) to GND to set tD; floating = 50 µs min delay; internal RCT = 500 kΩ typ. |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent current | 350 nA typical supply draw - extends battery life in always-on telematics and remote keyless entry modules |
| Factory-trimmed 3.1 V threshold | ±1% typical accuracy over temperature - eliminates need for external resistor divider or calibration in 3.3 V systems |
| Programmable reset delay | 50 µs to 6.2 s via single external capacitor - replaces discrete RC networks and simplifies BOM |
| Glitch-immune VDD sensing | 10 µs immunity to 5% overdrive transients - prevents false resets during load-dump or ignition noise events |
| Integrated MR pull-up | 100 kΩ internal resistor - reduces component count and PCB area vs. discrete pull-up solutions |
Applications
| Automotive Infotainment Head Unit | ADAS Domain Controller |
|---|---|
Use Scenario: Monitors 3.3 V VCORE and 1.8 V VI/O rails during cold crank and stop-start cycles. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET until both rails stabilize above 3.1 V and 1.6 V thresholds with 200 ms delay. Use Value: Prevents MCU lockup during voltage sag; meets ISO 16750-2 Pulse 4 requirement for robustness to slow-rising supplies. |
Use Scenario: Ensures clean boot sequence for radar SoC after 5 V main supply ramps post-ignition. IC Role / Device Role / Timing Role: Supervises 5 V rail and provides 500 ms programmable delay to satisfy SoC POR timing. Use Value: Eliminates need for discrete RC timer; guarantees reset deassertion only after stable power and clock lock. |
| Telematics Control Unit (TCU) | Driver Monitoring System (DMS) |
Use Scenario: Powers on LTE modem and GNSS receiver from 3.8 V battery backup during main power loss. IC Role / Device Role / Timing Role: Detects 3.1 V brownout on backup rail and asserts RESET to halt data transmission before corruption. Use Value: Enables graceful shutdown and EEPROM save; supports ASIL-B functional safety goals via deterministic reset behavior. |
Use Scenario: Supervises dual 1.2 V and 3.3 V supplies powering CMOS image sensor and ISP in cabin camera. IC Role / Device Role / Timing Role: Monitors both rails simultaneously using shared VDD path; asserts RESET if either falls below threshold. Use Value: Guarantees synchronized reset across sensor and processing chain - avoids image artifacts or frame drops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840DL31DBVR | Open-drain active-low output; requires external pull-up resistor; identical threshold, IQ, and delay specs | Suitable where MCU reset pin tolerates weak pull-up or where wired-OR reset bus is needed | Select when board already uses pull-up resistors or multiple supervisors share RESET line |
| MAX6373KA31+T | 3.1 V threshold, 1.2 µA IQ, fixed 200 ms delay, SOT-23-5, non-automotive grade | Lacks AEC-Q100 qualification and programmable delay; higher quiescent current limits battery life | Acceptable for cost-sensitive industrial prototypes but not for production automotive use |
Compared with TPS3840DL31DBVR, the TPS3840PL31DBVR eliminates external pull-up components and improves noise immunity; compared with MAX6373KA31+T, it delivers 3.4× lower IQ, full AEC-Q100 Grade 1 qualification, and field-configurable reset timing - making it the preferred choice for production automotive ECUs.
Availability
TPS3840PL31DBVR is available at Aetrix Electronics and suitable for automotive head units, ADAS domain controllers, and telematics control units requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for TPS3840PL31DBVR 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 experience in high-reliability power management and signal conditioning solutions.
The TPS3840-Q1 product line was designed specifically for automotive voltage monitoring applications demanding ultra-low power, high accuracy, and AEC-Q100 compliance - targeting infotainment, ADAS, and body electronics subsystems.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840PL31DBVR?
The TPS3840PL31DBVR has a factory-set negative-going input threshold (VIT−) of 3.1 V with ±1.5% maximum deviation over –40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 100 mV (typical), ensuring stable reset release without oscillation near the trip point. This specification is measured and guaranteed per TI's production test flow.
Does the TPS3840PL31DBVR require an external pull-up resistor on the RESET pin?
No, the TPS3840PL31DBVR uses a push-pull active-low output architecture and does not require an external pull-up resistor. Its RESET pin actively drives low during assertion and high during release, delivering VOH ≥ 0.8×VDD when sourcing 2 mA (VDD = 1.5–5 V). This eliminates BOM cost and layout area associated with discrete pull-ups.
How is the reset delay time programmed on the TPS3840PL31DBVR?
The reset delay time (tD) on the TPS3840PL31DBVR 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 delay follows tD = −ln(0.29) × RCT × CCT_EXT + 50 µs.
Is the TPS3840PL31DBVR qualified for automotive applications?
Yes, the TPS3840PL31DBVR is AEC-Q100 qualified for automotive applications (Grade 1: –40°C to +125°C ambient), with HBM ESD rating of ±2000 V and CDM rating of ±750 V. It is explicitly designated as TPS3840-Q1 in TI's documentation and meets requirements for use in head units, clusters, telematics, and driver monitoring systems.
Can the TPS3840PL31DBVR monitor multiple supply rails simultaneously?
No, the TPS3840PL31DBVR monitors only the VDD pin - which serves as both its supply and the monitored rail. To supervise multiple rails (e.g., 1.2 V and 3.3 V), separate TPS3840PL31DBVR devices or a multi-rail supervisor like TPS3808G33 must be used. Its design assumes single-rail supervision with high accuracy and ultra-low IQ.
TPS3840PL31DBVR 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:
- 3.1V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 619ms Typical
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3840PL31DBVR FAQ
1.How can I place an order for TPS3840PL31DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL31DBVR 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 TPS3840PL31DBVR reliable?
The price and inventory of TPS3840PL31DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL31DBVR is usually 5 days.
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4.How is shipping managed for TPS3840PL31DBVR?
TPS3840PL31DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PL31DBVR 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 TPS3840PL31DBVR?
For technical support, including TPS3840PL31DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL31DBVR requirements.
6.How does Aetrix verify that TPS3840PL31DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PL31DBVR 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 TPS3840PL31DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PL31DBVR?
All TPS3840PL31DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL31DBVR, 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 TPS3840PL31DBVR part is unused and in its original packaging.
Return procedure for TPS3840PL31DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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