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Texas Instruments TPS3840DL31DBVRQ1
- Part No.:
- TPS3840DL31DBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL31DBVRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,280
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Product details
Overview
TPS3840DL31DBVRQ1 from Texas Instruments is an automotive-grade nano-power voltage supervisor IC with open-drain active-low RESET output, fixed 3.1 V negative 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 supply rails in safety-critical automotive infotainment and driver-assistance systems.
For engineers reviewing the TPS3840DL31DBVRQ1 datasheet, TPS3840DL31DBVRQ1 pinout, TPS3840DL31DBVRQ1 application, or TPS3840DL31DBVRQ1 equivalent, this page delivers verified functional specifications, validated pin functions, confirmed AEC-Q100 Grade 1 qualification, and real-world automotive use context - all derived from TI's official SNVSBA1B revision B production datasheet.
Technical Context
The TPS3840DL31DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis (100 mV typical for 3.1 V threshold) and glitch-immune detection logic. Its CT pin interfaces with an external capacitor to set reset timeout via an internal 500 kΩ (typ) resistor, enabling programmable delay from 50 µs (CT floating) to 6.2 s (10 µF).
It features active-low manual reset (MR) with 600 mV logic-low threshold and internal 100 kΩ pull-up, plus power-on reset (VPOR = 950 mV) ensuring valid output state during VDD ramp-up. The open-drain RESET output supports flexible pull-up configuration and meets automotive I/O voltage tolerance requirements up to 12 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 3.1 V ±1.5% (max) over −40°C to +125°C - ensures reliable reset assertion at precise core rail undervoltage condition |
| Quiescent Current | 350 nA (typ), 700 nA (max) - 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 both fast MCU recovery and long power-rail stabilization timing |
| Hysteresis (VHYS) | 100 mV (typ) - prevents chatter during slow-rising/falling VDD transitions near threshold |
| Startup Delay (tSTRT) | 350 µs (max) - guarantees deterministic reset release after VDD exceeds VIT+ under worst-case conditions |
| 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 engine bay, instrument cluster, and ADAS ECU deployment |
Pinout & Package
TPS3840DL31DBVRQ1 uses the 5-pin SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, with gull-wing leads optimized for automated assembly and thermal performance in automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain active-low output | Drives low when VDD < VIT− or MR is asserted; requires external pull-up for logic-high state |
| 2: VDD | Supply and monitored input | Input voltage range 1.5 V–10 V; powers internal circuitry while being supervised |
| 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 via 100 kΩ internal pull-up when unused |
| 5: CT | Capacitor time-delay programming node | Connect external capacitor to GND to set tD; floating for minimum 50 µs delay |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent current | 350 nA typical supply draw - preserves battery life in always-on telematics and remote keyless entry modules |
| Programmable reset delay | 50 µs to 6.2 s via single external capacitor - eliminates need for external timers or microcontroller intervention |
| Automotive qualification | AEC-Q100 Grade 1, HBM ±2 kV, CDM ±750 V - validated for harsh automotive environments without derating |
| High-accuracy threshold | ±1.5% max VIT− error over full temperature range - reduces margining overhead in 3.3 V and 2.8 V rail monitoring |
| Glitch-immune VDD detection | 10 µs immunity to 5% overdrive transients - rejects noise spikes common in vehicle electrical systems |
| Low VPOR (950 mV) | Ensures defined RESET state during cold-cranking (low-battery cranking down to ~6 V system) |
Applications
| Automotive Instrument Cluster | ADAS Camera Module |
|---|---|
Use Scenario: Monitors 3.3 V VI/O rail powering display controller and CAN interface in digital instrument clusters subject to load dump and cold-crank events. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to MCU upon VI/O drop below 3.1 V, with 200 ms programmable hold-off to tolerate transient dips. Use Value: Prevents display corruption and CAN bus lockup by guaranteeing clean MCU reset before rail collapse, meeting ISO 16750-2 pulse 4a/b immunity requirements. |
Use Scenario: Supervises 2.8 V image sensor analog supply in forward-facing camera ECU where brownout must trigger safe shutdown before frame corruption. IC Role / Device Role / Timing Role: Detects 2.8 V rail sag using 3.1 V threshold (via resistive divider), asserts open-drain RESET to SoC with 500 ms delay set by 1 µF CT capacitor. Use Value: Enables graceful image buffer flush and power sequencing control - avoids corrupted frames that could mislead object detection algorithms. |
| Telematics Control Unit (TCU) | Automotive Head Unit |
Use Scenario: Provides primary reset supervision for LTE modem and GNSS receiver in always-connected TCU operating on 12 V battery with wide-input DC/DC. IC Role / Device Role / Timing Role: Monitors regulated 3.3 V domain; MR pin tied to ignition switch signal to force reset on key-off/key-on transition. Use Value: Ensures modem firmware reloads cleanly after power cycling - critical for eCall session integrity and OTA update reliability. |
Use Scenario: Supervises dual-core application processor (VCORE = 1.1 V, VI/O = 3.3 V) in infotainment head unit with multi-rail PMIC. IC Role / Device Role / Timing Role: Uses 3.1 V threshold on VI/O rail; CT pin configured for 100 ms delay to coordinate with VCORE rail stabilization sequence. Use Value: Eliminates race conditions between I/O and core power-up, preventing boot failures and PCIe link training errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL31DBVRQ1 | Push-pull active-low RESET output; no external pull-up required; slightly higher ICC (400 nA typ) | Better drive strength for direct MCU reset input; unsuitable where wired-OR or level-shifting is needed | Select when driving short traces to single MCU reset pin without pull-up constraints |
| MAX6373LASD+T | Fixed 3.08 V threshold, 1.2 µA ICC, non-automotive grade, SOT-23-5 package | Lacks AEC-Q100 qualification and nano-IQ performance; suitable only for industrial or consumer prototypes | Consider only for cost-sensitive non-automotive designs where 125°C operation and ultra-low IQ are not required |
Compared with TPS3840PL31DBVRQ1, the TPS3840DL31DBVRQ1 offers superior flexibility in mixed-voltage systems via open-drain output, while MAX6373LASD+T trades automotive reliability and ultra-low power for lower unit cost in non-safety-critical applications.
Availability
TPS3840DL31DBVRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and extended temperature support.
Supply support for TPS3840DL31DBVRQ1 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 electronics, with decades of automotive qualification expertise and broad manufacturing scale.
The TPS3840-Q1 product line was designed specifically for ultra-low-power, high-accuracy voltage monitoring in automotive ECUs - balancing AEC-Q100 robustness, nano-IQ operation, and field-programmable timing for next-generation cockpit and ADAS systems.
FAQ
What is the exact VIT− threshold voltage of the TPS3840DL31DBVRQ1?
The TPS3840DL31DBVRQ1 has a factory-set negative-going input threshold (VIT−) of 3.1 V, with guaranteed accuracy of ±1.5% over the full −40°C to +125°C operating temperature range per TI's SNVSBA1B datasheet. This value is fixed and not adjustable - the "31" in the part number explicitly denotes the 3.1 V variant.
Does the TPS3840DL31DBVRQ1 require an external pull-up resistor on the RESET pin?
Yes, the TPS3840DL31DBVRQ1 features an open-drain active-low RESET output and requires an external pull-up resistor to VDD or another logic rail. Typical values range from 10 kΩ to 100 kΩ depending on rise-time and bus loading requirements. This architecture enables wired-OR configurations and voltage-level translation.
How is the reset delay time (tD) programmed on the TPS3840DL31DBVRQ1?
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 (included in startup delay). Using Equation 2 from the datasheet (tD = −ln(0.29) × RCT × CCT_EXT + 50 µs), a 100 nF capacitor yields ~50 ms, and a 10 µF capacitor yields ~6.2 s - all verified across temperature.
Is the TPS3840DL31DBVRQ1 qualified for automotive applications?
Yes, the TPS3840DL31DBVRQ1 is AEC-Q100 qualified for automotive applications, specifically Grade 1 (−40°C to +125°C ambient), with HBM ESD rating of ±2 kV and CDM rating of ±750 V. It is intended for use in engine control, infotainment, ADAS, and body electronics per TI's official qualification report.
What is the maximum supply voltage the TPS3840DL31DBVRQ1 can monitor?
The TPS3840DL31DBVRQ1 supports an input supply voltage (VDD) range of 1.5 V to 10 V per its recommended operating conditions. Absolute maximum rating is 12 V, but sustained operation above 10 V is not specified. For monitoring >10 V rails (e.g., 12 V battery), a resistive divider must be used at the VDD pin.
TPS3840DL31DBVRQ1 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:
- 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
TPS3840DL31DBVRQ1 FAQ
1.How can I place an order for TPS3840DL31DBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL31DBVRQ1 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 TPS3840DL31DBVRQ1 reliable?
The price and inventory of TPS3840DL31DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL31DBVRQ1 is usually 5 days.
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Once your TPS3840DL31DBVRQ1 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 TPS3840DL31DBVRQ1?
For technical support, including TPS3840DL31DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL31DBVRQ1 requirements.
6.How does Aetrix verify that TPS3840DL31DBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3840DL31DBVRQ1 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 TPS3840DL31DBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3840DL31DBVRQ1?
All TPS3840DL31DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL31DBVRQ1, 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 TPS3840DL31DBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3840DL31DBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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