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Texas Instruments TPS3840DL40DBVRQ1
- Part No.:
- TPS3840DL40DBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL40DBVRQ1.pdf
- Description:
- AUTOMOTIVE HIGH-INPUT VOLTAGE SU
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3840DL40DBVRQ1 from Texas Instruments is an automotive-grade nano-IQ voltage supervisor with open-drain active-low RESET output, 4.0 V fixed threshold (±1.5% max), 350 nA typical quiescent current, and capacitor-programmable 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 TPS3840DL40DBVRQ1 datasheet, TPS3840DL40DBVRQ1 pinout, TPS3840DL40DBVRQ1 application, or TPS3840DL40DBVRQ1 equivalent, this page delivers verified electrical specifications, SOT-23-5 pin functions, AEC-Q100 Grade 1 qualification context, and real-world automotive use cases - all grounded in TI's production data sheet SNVSBA1B.
Technical Context
The TPS3840DL40DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis (200 mV typical for 4.0 V threshold) and glitch-immune VDD monitoring logic. Its internal CT pin circuitry features a 500 kΩ (typ) pull-down resistance enabling accurate RC-based delay timing across temperature.
It asserts RESET when VDD drops below 4.0 V (VIT−) or MR is pulled low, and deasserts only after VDD rises above 4.2 V (VIT+), MR is released, and the programmed tD expires - supporting robust power sequencing in 12 V automotive systems with wide input transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 4.0 V ±1.5% (max) - ensures precise brownout detection at nominal 3.3 V/5 V rail levels without external resistive dividers |
| IDD Quiescent Current | 350 nA (typ), 700 nA (max) - enables always-on monitoring in battery-backed automotive modules with multi-year shelf life |
| Reset Delay (tD) | 50 µs (no cap) to 6.2 s (10 µF) - programmable via external capacitor on CT pin for flexible system boot timing |
| Startup Delay (tSTRT) | 350 µs (max) - guarantees fast, deterministic reset assertion after cold power-up |
| Hysteresis (VHYS) | 200 mV (typ) - prevents chatter during slow-rising VDD or marginal supply conditions |
| Output Type | Open-drain active-low RESET - supports wired-OR configuration and level-shifting with external pull-up |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C ambient) - qualified for under-hood and cockpit electronics |
Pinout & Package
Package: 5-pin SOT-23 (DBV), 2.90 mm × 1.60 mm body size, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low output | Drives low during fault; requires external pull-up to host rail (e.g., 3.3 V); sinks ≥2 mA at VOL ≤200 mV |
| 2 - VDD | Supply and monitored input | Input voltage range 1.5 V–10 V; powers internal circuitry and serves as the monitored rail |
| 3 - GND | 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 ≤600 mV to assert RESET; floats high internally (100 kΩ pull-up); immune to <300 ns glitches |
| 5 - CT | Capacitor time-delay programming | Connect external capacitor (0–10 µF) to GND to set tD; floating = minimum 50 µs delay |
Key Features
| Feature | Design Value |
|---|---|
| Nano-IQ operation | 350 nA typical supply current enables permanent connection to 12 V battery without measurable drain |
| Programmable reset delay | Wide 50 µs–6.2 s range via single external capacitor - eliminates need for discrete timers or microcontroller intervention |
| High-accuracy threshold | ±1.5% max VIT− tolerance over –40°C to +125°C ensures reliable trip point across automotive thermal extremes |
| Glitch-immune MR input | Rejects pulses <300 ns wide - prevents spurious resets from EMI or switch bounce in noisy vehicle environments |
| Integrated hysteresis | 200 mV typical window for 4.0 V threshold avoids oscillation during slow VDD recovery or ripple |
Applications
| Automotive Head Unit Power Sequencing | ADAS Domain Controller Brownout Protection |
|---|---|
Use Scenario: Monitors 5 V supply rail powering DSP, GPU, and display interface in head unit during ignition cycling and load dump events. IC Role / Device Role / Timing Role: Voltage supervisor asserting open-drain RESET to SoC's POR pin; delay set to 100 ms via 100 nF CT capacitor. Use Value: Prevents firmware lockup by ensuring full rail stabilization before processor release - critical for ISO 26262 ASIL-B compliance. | Use Scenario: Guards 3.3 V core rail of radar/Ethernet domain controller exposed to transient surges in 48 V mild-hybrid architectures. IC Role / Device Role / Timing Role: Detects sub-4.0 V dips lasting >50 µs; asserts RESET until VDD recovers to 4.2 V and holds for 200 ms. Use Value: Eliminates need for software watchdog timeout - provides hardware-level fail-safe response within 350 µs startup latency. |
| Telematics Control Unit (TCU) Battery Backup Monitoring | Automotive Digital Cluster Microcontroller Reset |
Use Scenario: Supervises backup 3.0 V LDO output feeding RTC and CAN transceiver during main battery disconnect. IC Role / Device Role / Timing Role: Uses MR pin tied to MCU GPIO to force controlled reboot during firmware update; CT pin left floating for 50 µs delay. Use Value: Enables safe, atomic OTA updates with guaranteed reset synchronization - no risk of partial flash corruption. | Use Scenario: Ensures clean reset of cluster MCU (e.g., S32K144) after stop/start engine cycles where 12 V battery dips to 6.5 V. IC Role / Device Role / Timing Role: Monitors switched 5 V rail; triggers RESET if VDD falls below 4.0 V for >10 µs, with 10 ms delay for display controller readiness. Use Value: Guarantees deterministic boot state across 100,000+ start-stop cycles - meets OEM durability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL40DBVRQ1 | Push-pull active-low RESET output; no external pull-up required; higher IOH/IOL drive capability | Better suited for direct MCU reset inputs without pull-up resistor; less flexible for level-shifted or wired-OR buses | Select when board layout lacks space for pull-up or when driving heavy capacitive loads (>100 pF) |
| MAX6374DS30+T | Fixed 3.0 V threshold; 1.6 µA IDD; no MR or CT pins; SOT-23-3 package | Limited to basic reset function; no manual reset or programmable delay; lower accuracy (±2.5%) | Select only for cost-sensitive non-automotive applications requiring minimal features and smaller footprint |
Compared with TPS3840PL40DBVRQ1, the TPS3840DL40DBVRQ1 offers superior flexibility in bus topology and voltage translation but requires an external pull-up; versus MAX6374DS30+T, it delivers 5× lower quiescent current, AEC-Q100 qualification, and full programmability - making it the only choice for functional-safety-critical automotive designs.
Availability
TPS3840DL40DBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, ADAS domain controllers, telematics control units, and digital instrument clusters requiring stable component supply across extended temperature and long product lifecycles.
Supply support for TPS3840DL40DBVRQ1 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, embedded processing, and connectivity solutions for automotive, industrial, and personal electronics markets.
The TPS3840-Q1 product line was engineered specifically for automotive power integrity - combining ultra-low IQ, AEC-Q100 Grade 1 reliability, and programmable timing to replace discrete reset circuits in next-generation E/E architectures.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840DL40DBVRQ1?
The TPS3840DL40DBVRQ1 has a factory-trimmed negative-going input threshold (VIT−) of 4.0 V with ±1.5% maximum accuracy over –40°C to +125°C ambient temperature. This is confirmed in Section 7.5 of TI's SNVSBA1B datasheet, where VIT− accuracy is specified as –1.5% to +1.5% across temperature and supply voltage. The 4.0 V value is part of TI's standard 0.1 V step threshold grid (1.6 V to 4.9 V).
Does the TPS3840DL40DBVRQ1 require an external pull-up resistor on the RESET pin?
Yes, the TPS3840DL40DBVRQ1 features an open-drain active-low RESET output and requires an external pull-up resistor to a valid logic rail (e.g., 3.3 V or 5 V). Typical values range from 10 kΩ to 100 kΩ depending on rise time and bus capacitance. This is explicitly stated in the "TPS3840DL-Q1" functional description and Figure 4 timing diagram in the SNVSBA1B datasheet.
How is the reset delay time (tD) programmed on the TPS3840DL40DBVRQ1?
The reset delay time (tD) is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, tD = 50 µs (included in startup delay). With a 10 µF capacitor, tD reaches up to 6.2 s. The relationship follows tD = –ln(0.29) × RCT × CCT_EXT + 50 µs, where RCT = 500 kΩ (typ), per Equation 2 in Section 8.3.2 of SNVSBA1B.
Is the TPS3840DL40DBVRQ1 qualified for automotive applications?
Yes, the TPS3840DL40DBVRQ1 is AEC-Q100 qualified for automotive applications. It meets Grade 1 requirements (–40°C to +125°C ambient), HBM ESD Level 2 (±2000 V), and CDM ESD Level C7B (±750 V), as documented in Section 1 (Features) and Section 7.2 of the SNVSBA1B production datasheet.
What is the maximum operating voltage and quiescent current of the TPS3840DL40DBVRQ1?
The TPS3840DL40DBVRQ1 operates from 1.5 V to 10 V supply voltage and draws only 350 nA typical (700 nA max) quiescent current across that full range and over –40°C to +125°C, per Section 7.5 "Electrical Characteristics" in SNVSBA1B. This nano-IQ performance enables direct connection to automotive battery rails without significant standby drain.
TPS3840DL40DBVRQ1 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:
- Open Drain or Open Collector
- 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
TPS3840DL40DBVRQ1 FAQ
1.How can I place an order for TPS3840DL40DBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL40DBVRQ1 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 TPS3840DL40DBVRQ1 reliable?
The price and inventory of TPS3840DL40DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL40DBVRQ1 is usually 5 days.
3.What payment methods are accepted for TPS3840DL40DBVRQ1?
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TPS3840DL40DBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840DL40DBVRQ1 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 TPS3840DL40DBVRQ1?
For technical support, including TPS3840DL40DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL40DBVRQ1 requirements.
6.How does Aetrix verify that TPS3840DL40DBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3840DL40DBVRQ1 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 TPS3840DL40DBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3840DL40DBVRQ1?
All TPS3840DL40DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL40DBVRQ1, 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 TPS3840DL40DBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3840DL40DBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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