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Texas Instruments TPS3840DL29DBVRQ1
- Part No.:
- TPS3840DL29DBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL29DBVRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3840DL29DBVRQ1 from Texas Instruments is an automotive-grade nano-power voltage supervisor IC with open-drain active-low reset output, 2.9 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 TPS3840DL29DBVRQ1 datasheet, TPS3840DL29DBVRQ1 pinout, TPS3840DL29DBVRQ1 application, or TPS3840DL29DBVRQ1 equivalent, this page delivers verified electrical specs, validated SOT-23-5 pin functions, confirmed AEC-Q100 Grade 1 qualification, and real-world automotive use cases - all grounded in TI's production data sheet SNVSBA1B.
Technical Context
The TPS3840DL29DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis (100 mV typical for 2.9 V threshold) and glitch-immune VDD monitoring logic. Its internal CT pin circuitry features a 500 kΩ nominal resistance enabling accurate RC-based timing across temperature (–40°C to +125°C).
It asserts RESET when VDD falls below 2.9 V or MR is pulled low, and deasserts only after VDD rises above 3.0 V (2.9 V + 100 mV hysteresis) and the programmed tD delay expires - supporting robust sequencing in multi-rail automotive systems with VCORE/VI/O domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage (VIT−) | 2.9 V ±1.5% max - ensures precise brownout detection at 2.9 V supply rail with guaranteed margin against false resets. |
| Quiescent Current (IDD) | 350 nA typ / 700 nA max - enables always-on monitoring in battery-backed automotive modules without measurable drain. |
| Hysteresis (VHYS) | 100 mV typical - prevents oscillatory reset assertion during slow VDD recovery near threshold. |
| Startup Delay (tSTRT) | 350 µs max - guarantees fast system initialization after power-up, critical for ASIL-B timing-critical subsystems. |
| Reset Delay Range (tD) | 50 µs (no cap) to 6.2 s (10 µF) - supports flexible reset hold times for diverse MCU boot sequences and peripheral initialization. |
| Output Type | Open-drain active-low - allows wired-OR reset bus configuration and compatibility with multiple voltage domains via external pull-up. |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C ambient) - qualified for under-hood and cockpit electronics requiring full automotive reliability. |
Pinout & Package
TPS3840DL29DBVRQ1 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-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low output | Drives low during reset assertion; requires external pull-up to define logic-high level and voltage domain (e.g., 3.3 V or 5 V). |
| 2 - VDD | Supply and monitored input | Both powers the IC and serves as the voltage source being supervised; operates from 1.5 V to 10 V. |
| 3 - GND | Analog/digital ground reference | Common return path for internal comparator, bandgap, and output stage; must be low-impedance for noise immunity. |
| 4 - MR | Active-low manual reset input | Pull low to force reset regardless of VDD state; internally pulled up (100 kΩ); floating = inactive. |
| 5 - CT | Capacitor time-delay programming node | Connect external capacitor to GND to set reset timeout; floating = minimum 50 µs delay; 10 µF = ~6.2 s delay. |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent current | 350 nA typical supply draw enables permanent connection to vehicle battery without parasitic drain concerns. |
| Programmable reset delay | Full-range RC timing (50 µs–6.2 s) eliminates need for external timers or microcontroller intervention during power sequencing. |
| Automotive qualification | AEC-Q100 Grade 1 and HBM ±2 kV / CDM ±750 V ensure robustness in harsh ESD and thermal environments. |
| Glitch-immune VDD sensing | 10 µs minimum pulse rejection at 5% overdrive prevents spurious resets from transient supply noise or load switching. |
| High-accuracy threshold | ±1.5% max VIT− tolerance over temperature ensures deterministic reset behavior across full automotive operating range. |
Applications
| Automotive Head Unit Power Sequencing | ADAS Domain Controller Brownout Protection |
|---|---|
Use Scenario: Coordinating startup of SoC, display driver, and audio DSP in a centralized infotainment head unit with separate VCORE (1.8 V) and VI/O (3.3 V) rails. IC Role / Device Role / Timing Role: Monitors 3.3 V VI/O rail and triggers open-drain RESET signal to hold downstream logic until stable; CT pin configured for 200 ms delay to accommodate slowest rail. Use Value: Prevents firmware corruption by ensuring all peripherals are fully powered before SoC release, eliminating boot failures in cold-start conditions. | Use Scenario: Protecting radar processing unit during engine cranking, where battery voltage dips to 6–7 V for 100–500 ms. IC Role / Device Role / Timing Role: Supervises 5 V supply feeding FPGA and sensor interface; asserts RESET if voltage drops below 2.9 V, with 50 µs startup delay and no external capacitor for immediate response. Use Value: Guarantees clean restart of safety-critical radar stack upon voltage recovery, meeting ISO 26262 ASIL-B diagnostic coverage requirements. |
| Telematics Control Unit (TCU) Always-On Monitoring | Automotive Digital Cluster Microcontroller Reset |
Use Scenario: Maintaining GPS/GNSS and cellular modem readiness during vehicle sleep mode with <1 µA total system leakage. IC Role / Device Role / Timing Role: Continuously monitors 3.3 V always-on rail using ultra-low IDD; MR pin tied to MCU GPIO for controlled wake-up reset initiation. Use Value: Enables zero-power-loss supervision - extends battery life while preserving ability to detect and recover from deep brownouts during extended parking. | Use Scenario: Ensuring deterministic boot of cluster MCU after ignition cycle, especially following rapid key-off/key-on transitions. IC Role / Device Role / Timing Role: Supervises 1.8 V VCORE rail; RESET output drives MCU's dedicated reset pin; CT pin fitted with 100 nF capacitor for 60 ms hold time matching flash initialization window. Use Value: Eliminates sporadic "ghost resets" caused by marginal core voltage droop during ignition transients, improving customer-reported reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL29DBVRQ1 | Push-pull active-low output (vs. open-drain); no external pull-up required; higher VOL (200 mV @ 2 mA) vs. OD leakage-limited low state. | Suitable where single-supply reset bus and lower board space are prioritized over multi-voltage flexibility. | Select when driving only one MCU reset pin directly from 3.3 V rail and minimizing external components. |
| MAX6375R29+T | Fixed 2.93 V threshold, 1.2 µA max IDD, SOT-23-5, but lacks MR input and programmable delay; only fixed 200 ms reset timeout. | Applicable in cost-sensitive non-AEC-Q100 modules where manual reset and adjustable timing are unnecessary. | Choose only for legacy designs needing drop-in replacement without redesigning timing or reset control logic. |
Compared with TPS3840PL29DBVRQ1, the TPS3840DL29DBVRQ1 offers superior voltage-domain interoperability via open-drain output, while MAX6375R29+T trades configurability for lower BOM count - making TPS3840DL29DBVRQ1 optimal for complex, multi-rail automotive systems requiring both flexibility and qualification rigor.
Availability
TPS3840DL29DBVRQ1 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 TPS3840DL29DBVRQ1 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 with deep automotive design expertise and manufacturing scale.
The TPS3840-Q1 product line was engineered specifically for AEC-Q100-compliant automotive power management - emphasizing ultra-low IQ, high-accuracy threshold stability, and robust glitch immunity in demanding vehicle electrical environments.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840DL29DBVRQ1?
The TPS3840DL29DBVRQ1 has a factory-set negative-going input threshold (VIT−) of 2.9 V with ±1.5% maximum deviation over –40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 100 mV (typical), resulting in a VIT+ of 3.0 V. These values are specified in TI's production datasheet SNVSBA1B Section 7.5.
Does the TPS3840DL29DBVRQ1 require an external pull-up resistor on the RESET pin?
Yes, the TPS3840DL29DBVRQ1 features an open-drain active-low RESET output and requires an external pull-up resistor to define the high logic level. Recommended value is 100 kΩ to the target voltage domain (e.g., 3.3 V or 5 V). This enables mixed-voltage system integration and wired-OR reset bus configurations - a key design feature confirmed in Section 6 and Figure 4 of the datasheet.
How is the reset delay time programmed on the TPS3840DL29DBVRQ1?
The reset delay (tD) is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, tD is 50 µs (included in startup delay). Using a 10 µF capacitor yields ~6.2 s delay. The relationship follows tD = −ln(0.29) × RCT × CCT_EXT + 50 µs, where RCT = 500 kΩ (typical). This RC timing method is detailed in Section 8.3.2 and Figure 39 of SNVSBA1B.
Is the TPS3840DL29DBVRQ1 qualified for automotive applications?
Yes, the TPS3840DL29DBVRQ1 is AEC-Q100 qualified for automotive use: Grade 1 (–40°C to +125°C ambient), HBM ESD ±2 kV, and CDM ESD ±750 V. It meets functional safety requirements for ASIL-B systems when used per TI's recommended layout and decoupling guidelines in Sections 11 and 12 of SNVSBA1B.
What is the quiescent current consumption of the TPS3840DL29DBVRQ1 across voltage and temperature?
The TPS3840DL29DBVRQ1 draws 350 nA typical and 700 nA maximum supply current (IDD) over 1.5 V–10 V VDD and –40°C to +125°C. This nano-IQ performance is validated in Section 7.5 Electrical Characteristics and Figure 7 of SNVSBA1B, enabling direct connection to vehicle battery without measurable parasitic drain.
TPS3840DL29DBVRQ1 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:
- 2.9V
- 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
TPS3840DL29DBVRQ1 FAQ
1.How can I place an order for TPS3840DL29DBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL29DBVRQ1 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 TPS3840DL29DBVRQ1 reliable?
The price and inventory of TPS3840DL29DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL29DBVRQ1 is usually 5 days.
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Once your TPS3840DL29DBVRQ1 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 TPS3840DL29DBVRQ1?
For technical support, including TPS3840DL29DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL29DBVRQ1 requirements.
6.How does Aetrix verify that TPS3840DL29DBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3840DL29DBVRQ1 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 TPS3840DL29DBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3840DL29DBVRQ1?
All TPS3840DL29DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL29DBVRQ1, 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 TPS3840DL29DBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3840DL29DBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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