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Texas Instruments TPS3840DL47DBVRQ1
- Part No.:
- TPS3840DL47DBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL47DBVRQ1.pdf
- Description:
- AUTOMOTIVE HIGH-INPUT VOLTAGE SU
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3840DL47DBVRQ1 from Texas Instruments is an automotive-grade nano-IQ voltage supervisor with open-drain active-low RESET output, 4.7 V fixed threshold (±1.5% max), 350 nA typical supply 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 microcontroller power rails.
For engineers reviewing the TPS3840DL47DBVRQ1 datasheet, TPS3840DL47DBVRQ1 pinout, TPS3840DL47DBVRQ1 application, or TPS3840DL47DBVRQ1 equivalent, this page delivers verified electrical specs, validated SOT-23-5 pin functions, AEC-Q100 Grade 1 operating context (–40°C to +125°C), and real-world automotive use cases with design-meaningful parameter mapping.
Technical Context
The TPS3840DL47DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis (200 mV typical for 4.7 V threshold) and glitch-immune VDD sensing. Its internal state machine asserts RESET when VDD falls below 4.7 V (VIT−) or MR is pulled low, and deasserts only after VDD rises above 4.9 V (VIT+) and the CT-programmed delay expires.
It uses a dedicated CT pin to set reset timeout via external capacitor (50 µs to 6.2 s), supports manual reset with internal 100 kΩ pull-up on MR, and features ultra-low quiescent current maintained across full temperature and supply range (1.5 V to 10 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 4.7 V ±1.5% max - ensures accurate brownout detection at nominal 5 V rail with margin for automotive transients |
| Supply Current (IDD) | 350 nA typ / 700 nA max - enables >10-year battery life in always-on vehicle modules |
| Hysteresis (VHYS) | 200 mV typical - prevents oscillatory reset assertion during slow VDD recovery near threshold |
| Startup Delay (tSTRT) | ≤350 µs max - guarantees fast, deterministic reset release after cold start |
| Reset Delay Range (tD) | 50 µs (CT floating) to 6.2 s (10 µF) - supports flexible system boot sequencing and watchdog timeout alignment |
| Output Type | Open-drain active-low RESET - allows 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
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low output | Drives low to assert reset; requires external pull-up; sinks ≥2 mA at VDD ≤5 V |
| 2 - VDD | Power input & monitored rail | Supplies internal circuitry and serves as the voltage being supervised (1.5–10 V range) |
| 3 - GND | Reference ground | Return path for all internal blocks; must be low-impedance connection to system ground plane |
| 4 - MR | Active-low manual reset input | Pull ≤600 mV to force reset; floats high via 100 kΩ internal pull-up when unused |
| 5 - CT | Capacitor time-delay programming node | Connect external capacitor to GND to set tD; floating = minimum 50 µs delay |
Key Features
| Feature | Design Value |
|---|---|
| Nano-IQ operation | 350 nA typical supply current enables integration into energy-critical always-on domains (e.g., telematics wake-up logic) |
| Programmable reset delay | Full-range timing control (50 µs–6.2 s) via single external capacitor eliminates need for external timers or MCUs |
| High-accuracy threshold | ±1.5% max VIT− tolerance over –40°C to +125°C ensures robust trip point across automotive thermal zones |
| Glitch-immune VDD sensing | 10 µs immunity to 5% overdrive transients prevents false resets during load dump or cranking events |
| Integrated MR pull-up | 100 kΩ internal MR pull-up resistor reduces BOM count and PCB footprint vs discrete resistor solutions |
Applications
| Automotive Head Unit Power Sequencing | ADAS Camera Module Brownout Protection |
|---|---|
Use Scenario: Monitors 5 V supply to MCU and display controller in infotainment head unit during ignition cycles and stop-start operation. IC Role / Device Role / Timing Role: Voltage supervisor asserting open-drain RESET to hold MCU in reset until stable 5 V rail is confirmed and 200 ms delay elapses. Use Value: Prevents corrupted firmware execution during marginal VDD conditions; 4.7 V threshold aligns with 5 V LDO dropout margin. |
Use Scenario: Supervises 3.3 V core rail of image signal processor in rear-view camera module exposed to engine bay thermal stress. IC Role / Device Role / Timing Role: Detects brownout on VCORE and holds ISP in reset for ≥100 ms after VDD recovers above 4.9 V (VIT+). Use Value: Eliminates image artifacts or sensor lockup caused by undervoltage; 125°C ambient rating supports placement near heat sources. |
| Telematics Control Unit (TCU) Watchdog Coordination | Automotive Cluster Microcontroller Reset Management |
Use Scenario: Provides primary power-on reset and secondary brownout reset for LTE modem and GNSS receiver in emergency call (eCall) TCU. IC Role / Device Role / Timing Role: Generates synchronized RESET pulse using CT capacitor to match modem initialization timing requirements (e.g., 500 ms). Use Value: Replaces dual discrete supervisors; programmable tD avoids firmware delays and simplifies qualification testing. |
Use Scenario: Ensures clean startup of instrument cluster MCU after battery reconnection or deep sleep wake-up. IC Role / Device Role / Timing Role: Monitors 3.3 V I/O rail and asserts RESET until rail stabilizes and 150 ms delay completes, preventing SPI/I²C bus contention. Use Value: 350 nA IDD minimizes parasitic drain on backup battery; open-drain output interfaces directly with cluster MCU's reset input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL47DBVRQ1 | Push-pull active-low RESET output; no external pull-up required; higher VOL (200 mV @ 2 mA) | Better for noise-sensitive systems where pull-up resistor adds leakage or capacitance; unsuitable for wired-OR reset buses | Select when board layout prohibits external pull-up or when driving capacitive loads directly |
| MAX6374GUR+T | Fixed 4.63 V threshold; 1.2 µA IDD; no MR pin; 200 ms factory-fixed delay | Lacks manual reset and programmable delay; higher quiescent current limits battery-life-critical use | Choose only if fixed delay and absence of MR are acceptable, and nano-IQ is not required |
Compared with TPS3840PL47DBVRQ1, the TPS3840DL47DBVRQ1 enables shared reset busing and level translation; compared with MAX6374GUR+T, it offers 3.4× lower IDD, user-configurable timing, and MR flexibility - critical for modern automotive domain controllers.
Availability
TPS3840DL47DBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, ADAS camera modules, telematics control units, and instrument clusters requiring stable component supply with AEC-Q100 compliance and long-term production support.
Supply support for TPS3840DL47DBVRQ1 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 technologies for automotive, industrial, and consumer applications.
The TPS3840-Q1 product line was designed specifically for automotive power monitoring - combining AEC-Q100 qualification, nano-quiescent current, and programmable timing to replace legacy discrete reset solutions in safety-critical ECUs.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840DL47DBVRQ1?
The TPS3840DL47DBVRQ1 has a factory-trimmed negative-going input threshold (VIT−) of 4.7 V with ±1.5% maximum deviation over –40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 200 mV (typical), resulting in a VIT+ of 4.9 V. This specification is guaranteed per TI's production test flow and documented in Section 7.5 of the SNVSBA1B datasheet.
Does the TPS3840DL47DBVRQ1 require an external pull-up resistor on the RESET pin?
Yes, the TPS3840DL47DBVRQ1 features an open-drain active-low RESET output and requires an external pull-up resistor to VDD or another logic rail. A 100 kΩ pull-up is recommended for typical applications; values between 10 kΩ and 1 MΩ are supported depending on rise time and bus loading requirements. The device itself does not include internal pull-up on RESET.
How is the reset delay time (tD) programmed on the TPS3840DL47DBVRQ1?
The reset delay time is set by connecting an external capacitor between the CT pin (Pin 5) and GND. With CT floating, tD = 50 µs (included in startup delay). Using Equation 2 from the datasheet (tD = −ln(0.29) × RCT × CCT_EXT + 50 µs), a 100 nF capacitor yields ~150 ms, and 10 µF yields ~6.2 s. RCT is 500 kΩ (typical) per Section 7.5.
Is the TPS3840DL47DBVRQ1 pin-compatible with other members of the TPS3840-Q1 family?
Yes, all TPS3840-Q1 variants - including TPS3840DL47DBVRQ1, TPS3840PL47DBVRQ1, and TPS3840PH47DBVRQ1 - share identical SOT-23-5 (DBV) pinout and footprint. Pin 1 is RESET, Pin 2 is VDD, Pin 3 is GND, Pin 4 is MR, and Pin 5 is CT. Only the output topology (open-drain vs. push-pull) and threshold variant differ between part numbers.
What automotive qualification does the TPS3840DL47DBVRQ1 meet?
The TPS3840DL47DBVRQ1 is AEC-Q100 qualified for Grade 1 operation (–40°C to +125°C ambient), with HBM ESD rating of ±2000 V and CDM rating of ±750 V. It is rated for use in automotive head units, clusters, displays, and telematics systems, and includes built-in glitch immunity, VPOR (300 mV), and robust transient rejection per ISO 7637-2 pulse definitions.
TPS3840DL47DBVRQ1 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:
- 4.7V
- 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
TPS3840DL47DBVRQ1 FAQ
1.How can I place an order for TPS3840DL47DBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL47DBVRQ1 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 TPS3840DL47DBVRQ1 reliable?
The price and inventory of TPS3840DL47DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL47DBVRQ1 is usually 5 days.
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TPS3840DL47DBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840DL47DBVRQ1 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 TPS3840DL47DBVRQ1?
For technical support, including TPS3840DL47DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL47DBVRQ1 requirements.
6.How does Aetrix verify that TPS3840DL47DBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3840DL47DBVRQ1 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 TPS3840DL47DBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3840DL47DBVRQ1?
All TPS3840DL47DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL47DBVRQ1, 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 TPS3840DL47DBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3840DL47DBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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