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Texas Instruments TPS3840DL46DBVRQ1
- Part No.:
- TPS3840DL46DBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL46DBVRQ1.pdf
- Description:
- AUTOMOTIVE HIGH-INPUT VOLTAGE SU
- Quantity:
- Payment:
- Shipping:
Inventory:2,890
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Product details
Overview
TPS3840DL46DBVRQ1 from Texas Instruments is an automotive-grade nano-power voltage supervisor IC with open-drain active-low RESET output, fixed 4.6 V threshold (VIT−), ±1.5% accuracy over −40°C to +125°C, 350 nA typical quiescent current, and capacitor-programmable reset delay up to 6.2 s. It monitors microcontroller core or I/O supply rails in safety-critical automotive systems.
For engineers reviewing the TPS3840DL46DBVRQ1 datasheet, TPS3840DL46DBVRQ1 pinout, TPS3840DL46DBVRQ1 application, or TPS3840DL46DBVRQ1 equivalent, this page delivers verified electrical specifications, validated SOT-23-5 pin functions, confirmed AEC-Q100 Grade 1 qualification, and two technically documented alternative parts for automotive reset supervision.
Technical Context
The TPS3840DL46DBVRQ1 implements a precision bandgap-based comparator with built-in hysteresis (200 mV typical for VIT− ≥ 3.1 V) and glitch-immune detection logic. Its CT pin enables RC-based timing control with internal RCT ≈ 500 kΩ, supporting programmable tD from 50 µs (CT floating) to 6.2 s (10 µF).
It asserts RESET when VDD falls below 4.6 V or MR is pulled low, and deasserts after VDD rises above 4.8 V (VIT+ = VIT− + VHYS) and tD expires. VPOR is 950 mV, ensuring reliable power-on reset behavior under slow-ramp conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 4.6 V ±1.5% (max error over −40°C to +125°C); sets precise brownout detection point for 5 V or 4.8 V rails |
| Quiescent Current | 350 nA typical at 25°C; enables multi-year battery operation in always-on automotive modules |
| Reset Delay Range | 50 µs (CT open) to 6.2 s (CT = 10 µF); supports flexible system initialization timing without external timers |
| Output Type | Open-drain active-low RESET; allows wired-OR configuration and level-shifting with external pull-up |
| Hysteresis | 200 mV typical (VIT+ = 4.8 V); prevents oscillation during slow or noisy VDD recovery |
| Startup Delay | 350 µs max; ensures stable internal biasing before first reset assertion after power-up |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C ambient); qualified for engine bay, infotainment, and ADAS ECU environments |
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 | Sinks current when asserted; requires external pull-up to host rail (e.g., 3.3 V or 5 V); compatible with µC reset inputs |
| 2: VDD | Supply and monitored input | Both powers the IC and serves as the voltage being supervised; operates from 1.5 V to 10 V |
| 3: GND | Analog/digital ground reference | Common return path for internal circuitry and external CT/MR components; must be low-impedance |
| 4: MR | Active-low manual reset input | Pull to ≤600 mV to force immediate RESET assertion; floats high internally (100 kΩ pull-up) |
| 5: CT | Capacitor time-delay programming node | Connect external capacitor to GND to set tD; floating = minimum 50 µs delay; no series resistor required |
Key Features
| Feature | Design Value |
|---|---|
| Nano-IQ operation | 350 nA typical supply current enables use in always-on vehicle networks (e.g., CAN/LIN wake-up circuits) |
| Programmable reset delay | Single external capacitor (0–10 µF) replaces discrete RC timers and reduces BOM count by one IC |
| High-accuracy threshold | ±1.5% VIT− tolerance eliminates need for external trimming in production calibration |
| Glitch immunity | 10 µs minimum pulse rejection on VDD at 5% overdrive prevents false resets from ESD or load-switch transients |
| Automotive qualification | AEC-Q100 Grade 1 and CDM ESD Class C7B ensure reliability in harsh automotive PCB environments |
Applications
| Automotive Head Unit Power Sequencing | ADAS Camera Module Supervision |
|---|---|
Use Scenario: Monitors 5 V supply to infotainment SoC during ignition cycle and sleep/wake transitions. IC Role / Device Role / Timing Role: Voltage supervisor asserting open-drain RESET to SoC until 5 V rail stabilizes above 4.6 V and remains valid for user-programmed delay. Use Value: Prevents firmware lockup from premature boot due to undershoot; 350 nA IQ extends battery drain time during parking mode. | Use Scenario: Ensures clean startup of image sensor and ISP in rear-view camera ECU after cold crank. IC Role / Device Role / Timing Role: Detects VDD drop below 4.6 V during cranking; holds camera processor in reset until post-cranking recovery completes. Use Value: Eliminates corrupted frame capture at engine start; 200 mV hysteresis avoids chatter during marginal 4.8 V rail recovery. |
| Telematics Control Unit (TCU) Watchdog Enable | Electric Power Steering (EPS) MCU Reset |
Use Scenario: Provides primary power-good signal to enable TCU cellular modem after main 12 V DC/DC output reaches regulation. IC Role / Device Role / Timing Role: Generates delayed active-low RESET to modem baseband processor only after 4.6 V rail sustains >100 ms. Use Value: Guarantees modem firmware loads only after stable power; CT pin capacitor sets exact 200 ms delay per OEM spec. | Use Scenario: Supervises 3.3 V VCORE rail feeding EPS motor controller MCU during drive-cycle voltage dips. IC Role / Device Role / Timing Role: Asserts RESET if VCORE drops below 4.6 V (monitored via resistive divider), preventing unsafe torque command execution. Use Value: Meets ISO 26262 ASIL-B functional safety requirements for reset integrity; AEC-Q100 Grade 1 ensures operation at 125°C junction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL46DBVRQ1 | Push-pull active-low RESET output; no external pull-up required; higher VOL (200 mV @ 2 mA) vs. open-drain leakage-limited VOL | Suitable where board space prohibits pull-up resistor or where faster rise time is needed without RC trade-off | Select when driving short traces directly into µC reset pin without level translation or shared bus |
| MAX6375XR37+T | Fixed 3.7 V threshold; 1.2 µA IQ; no MR or CT pins; SOT-23-3 package | Limited to simpler, non-programmable, lower-accuracy supervision in cost-sensitive non-automotive designs | Choose only for legacy 3.3 V systems requiring minimal footprint and no delay programming |
Compared with TPS3840PL46DBVRQ1, the TPS3840DL46DBVRQ1 offers superior noise immunity via external pull-up selection and voltage translation flexibility; versus MAX6375XR37+T, it provides AEC-Q100 qualification, 3× lower IQ, programmable delay, and manual reset - essential for modern automotive ECUs.
Availability
TPS3840DL46DBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term production support.
Supply support for TPS3840DL46DBVRQ1 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 voltage monitoring, combining ultra-low IQ, high-accuracy thresholds, and AEC-Q100 qualification to replace discrete reset circuits in safety-critical ECUs.
FAQ
What is the exact threshold voltage of TPS3840DL46DBVRQ1 and how accurate is it across temperature?
The TPS3840DL46DBVRQ1 has a factory-set negative-going input threshold (VIT−) of 4.6 V with ±1.5% maximum deviation over the full −40°C to +125°C operating range. At 25°C, typical accuracy is ±1%. This specification is guaranteed in the datasheet's Electrical Characteristics table and validated per AEC-Q100 stress testing. The 4.6 V value is encoded in the part number suffix "L46".
Does TPS3840DL46DBVRQ1 require an external pull-up resistor on the RESET pin?
Yes, TPS3840DL46DBVRQ1 features an open-drain RESET output and requires an external pull-up resistor to the host supply rail (e.g., 3.3 V or 5 V). Typical values range from 10 kΩ to 100 kΩ depending on rise-time and bus loading requirements. This design enables level shifting and wired-OR reset bus configurations not possible with push-pull variants like TPS3840PL46DBVRQ1.
How is the reset delay time (tD) programmed on TPS3840DL46DBVRQ1?
The reset delay time (tD) is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With CT open, tD = 50 µs. Using a 100 nF capacitor yields ~62 ms; 1 µF gives ~619 ms; and 10 µF achieves the maximum 6.2 s delay. The internal CT resistance is 500 kΩ typical, and the relationship follows tD = −ln(0.29) × RCT × CCT_EXT + 50 µs.
Is TPS3840DL46DBVRQ1 qualified for automotive applications?
Yes, TPS3840DL46DBVRQ1 is AEC-Q100 qualified for automotive use. It meets Grade 1 temperature requirements (−40°C to +125°C ambient), HBM ESD Class 2 (±2000 V), and CDM ESD Class C7B (±750 V). These qualifications are documented in the official TI TPS3840-Q1 datasheet (SNVSBA1B) and apply specifically to the DBVRQ1 variant.
What is the power-on reset (VPOR) voltage of TPS3840DL46DBVRQ1?
The power-on reset (VPOR) voltage of TPS3840DL46DBVRQ1 is 950 mV. This is the minimum VDD level at which the device guarantees a controlled RESET output state during power-up, provided the VDD slew rate is ≤100 mV/µs. VPOR ensures deterministic reset assertion even during very slow supply ramps, such as those seen in battery-backed systems.
TPS3840DL46DBVRQ1 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:
- 4.6V
- 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
TPS3840DL46DBVRQ1 FAQ
1.How can I place an order for TPS3840DL46DBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL46DBVRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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6.How does Aetrix verify that TPS3840DL46DBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3840DL46DBVRQ1 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 TPS3840DL46DBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3840DL46DBVRQ1?
All TPS3840DL46DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL46DBVRQ1, 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 TPS3840DL46DBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3840DL46DBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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