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Texas Instruments TPS3840PL31DBVRQ1
- Part No.:
- TPS3840PL31DBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL31DBVRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3840PL31DBVRQ1 from Texas Instruments is an automotive-grade nano-power voltage supervisor with push-pull active-low reset output, 3.1 V fixed threshold (±1.5% max), 350 nA typical quiescent current, and user-programmable reset delay up to 6.2 s via external capacitor on CT pin - used for reliable power-on reset and brownout detection in automotive infotainment and ADAS microcontroller power rails.
For engineers reviewing the TPS3840PL31DBVRQ1 datasheet, TPS3840PL31DBVRQ1 pinout, TPS3840PL31DBVRQ1 application, or TPS3840PL31DBVRQ1 equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive AEC-Q100 Grade 1 operation (–40°C to +125°C), exact SOT-23 (DBV) package mapping, and two technically documented alternative parts for system-level design continuity.
Technical Context
The TPS3840PL31DBVRQ1 integrates a precision bandgap reference, hysteresis-enabled comparator, glitch-immune manual reset input (MR), and internal CT pin resistor (500 kΩ typ) to enable capacitor-based timing. Its push-pull output drives RESET low without external pull-up, supporting fast deassertion (tP_HL = 30 µs typ) after VDD exceeds VIT+ = VIT- + VHYS.
It operates across 1.5 V to 10 V supply range with VPOR = 300 mV (min), supports MR logic thresholds of VMRL = 600 mV (max) and VMRH = 0.7×VDD (min), and features built-in immunity to VDD transients ≥10 µs at 5% overdrive - critical for noisy automotive 12 V battery-derived rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage (VIT-) | 3.1 V ±1.5% max - ensures accurate brownout detection for 3.3 V microcontroller cores under temperature and aging variation. |
| Quiescent Current (IDD) | 350 nA typ / 700 nA max - enables multi-year battery life in always-on automotive modules without compromising supervision integrity. |
| Reset Delay Range (tD) | 50 µs (CT open) to 6.2 s (10 µF) - allows flexible power sequencing alignment with slow-ramping DC/DC converters or FPGA configuration timelines. |
| Startup Delay (tSTRT) | ≤350 µs - guarantees rapid system readiness after cold crank or ignition-on, minimizing boot latency in safety-critical ECUs. |
| Hysteresis (VHYS) | 100 mV typ (for VIT- ≤3.0 V) - prevents oscillatory reset assertion during marginal VDD recovery near threshold. |
| Output Type | Push-pull active-low - eliminates need for external pull-up resistor, reduces BOM count, and ensures deterministic high-Z release. |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C ambient) - qualified for engine bay, instrument cluster, and ADAS domain controller mounting locations. |
Pinout & Package
SOT-23 (DBV) 5-pin plastic package, 2.90 mm × 1.60 mm body size, 0.95 mm max height, gull-wing leads - compatible with standard automated PCB assembly and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull output | Drives MCU reset input directly; sinks 2 mA @ 200 mV VOL; no external pull-up required; releases high-impedance after tD. |
| 2 - VDD | Supply and monitored rail input | Accepts 1.5–10 V; powers internal circuitry; monitored for VIT- violation; requires local 0.1 µF bypass capacitor. |
| 3 - GND | Analog and digital ground reference | Single ground connection; must be low-impedance path to system ground plane to maintain threshold accuracy and noise immunity. |
| 4 - MR | Active-low manual reset input | Pulled internally to VDD via 100 kΩ; asserts RESET when driven ≤600 mV; releases after tD when floated or raised ≥0.7×VDD. |
| 5 - CT | Capacitor time-delay programming node | Connects to GND via external capacitor (0–10 µF); sets tD via RCT = 500 kΩ; floating = minimum 50 µs delay. |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent current | 350 nA typical supply draw enables use in always-on vehicle networks (e.g., CAN wake-up circuits) without measurable battery drain. |
| Factory-trimmed 3.1 V threshold | 1% typical accuracy (±1.5% max) over –40°C to +125°C eliminates need for external calibration or trimming resistors. |
| Programmable reset delay | External capacitor on CT pin provides precise, temperature-stable delay tuning - avoids reliance on RC tolerances or microcontroller firmware timers. |
| Glitch-immune VDD monitoring | Rejects transients <10 µs at 5% overdrive - prevents false resets during load dump or alternator ripple events in automotive electrical systems. |
| Integrated MR pull-up | 100 kΩ internal resistor on MR pin removes need for discrete pull-up, reducing component count and PCB area in space-constrained modules. |
Applications
| Automotive Instrument Cluster | ADAS Domain Controller Power Sequencing |
|---|---|
|
Use Scenario: Monitors 3.3 V core rail powering cluster MCU and display driver ICs during ignition cycle and stop-start operation. IC Role / Device Role / Timing Role: Provides power-on reset and brownout detection; asserts RESET until VDD stabilizes above 3.1 V + hysteresis and tD expires. Use Value: Prevents display corruption or MCU lockup during battery voltage sag (<3.1 V) caused by HVAC compressor engagement or headlight load. |
Use Scenario: Coordinates startup of radar SoC, camera ISP, and safety MCU in centralized ADAS ECU with multi-rail DC/DC architecture. IC Role / Device Role / Timing Role: Generates sequenced reset signals using CT capacitor to stagger initialization across voltage domains (e.g., 1.8 V, 3.3 V, 5 V). Use Value: Eliminates need for discrete timing RC networks or FPGA-based sequencing logic - reduces BOM, layout complexity, and qualification effort. |
| Telematics Control Unit (TCU) | Automotive Head Unit Audio Subsystem |
|
Use Scenario: Supervises 5 V USB-C PD rail and 3.3 V modem processor supply in connected vehicle telematics module. IC Role / Device Role / Timing Role: Detects undervoltage on primary rail and triggers hardware reset before cellular modem enters undefined state during low-battery conditions. Use Value: Ensures reliable emergency call (eCall) functionality by guaranteeing clean restart after battery recovery - meets UNECE R155 functional safety requirements. |
Use Scenario: Monitors 12 V-to-3.3 V buck converter output feeding DSP, audio codec, and touchscreen controller in infotainment head unit. IC Role / Device Role / Timing Role: Delays RESET deassertion using 100 nF CT capacitor to match audio subsystem power-up timing (≈1.2 ms), preventing pop-noise on speakers. Use Value: Replaces software-controlled GPIO reset delays with deterministic, hardware-based timing - improves audio boot reliability across temperature and voltage corners. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840DL31DBVRQ1 | Open-drain active-low output; requires external pull-up resistor; identical threshold, IDD, tD, and AEC-Q100 qualification. | Used where shared reset bus or level-shifting is needed; incompatible with direct MCU reset pin requiring push-pull drive. | Select when system already uses pull-up on reset net or when multiple supervisors share one reset line. |
| TLV809E31DBZRQ1 | Fixed 3.1 V threshold, open-drain output, higher IDD (1.2 µA typ), no programmable delay (fixed 200 ms), same SOT-23-3 package (3-pin, no MR/CT). | Supports basic POR only; lacks manual reset and adjustable delay - insufficient for complex power sequencing or service-mode reset. | Select only for cost-sensitive, single-rail applications where fixed delay and no MR capability are acceptable. |
Compared with TPS3840PL31DBVRQ1, the DL31 variant retains full timing and accuracy specs but shifts reset drive architecture, while TLV809E31 sacrifices programmability and ultra-low IDD for lower pin count and cost - making TPS3840PL31DBVRQ1 optimal for AEC-Q100 systems needing flexible, low-power, hardware-controlled reset coordination.
Availability
TPS3840PL31DBVRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS domain controllers, and telematics control units requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for TPS3840PL31DBVRQ1 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 company specializing in analog, embedded processing, and automotive ICs, with decades of leadership in power management and system supervision solutions.
The TPS3840-Q1 product line was designed specifically for automotive power rail monitoring - delivering nano-power consumption, AEC-Q100 Grade 1 qualification, and programmable timing to meet stringent functional safety and energy efficiency requirements in modern E/E architectures.
FAQ
What is the exact threshold voltage and tolerance of the TPS3840PL31DBVRQ1?
The TPS3840PL31DBVRQ1 has a factory-set negative-going input threshold (VIT-) of 3.1 V with ±1.5% maximum deviation over –40°C to +125°C ambient temperature, and 1% typical accuracy at 25°C. This value is laser-trimmed during production and does not require external adjustment.
Does the TPS3840PL31DBVRQ1 require an external pull-up resistor on the RESET pin?
No. The TPS3840PL31DBVRQ1 features a push-pull active-low output, meaning it actively drives RESET low and releases it to high-impedance - eliminating the need for an external pull-up resistor. This reduces BOM count and ensures deterministic release behavior without dependency on external component values.
How is the reset delay time programmed on the TPS3840PL31DBVRQ1?
The reset delay (tD) is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, tD = 50 µs; with a 10 µF capacitor, tD ≈ 6.2 s. The internal CT pin resistance is 500 kΩ (typ), enabling precise, temperature-stable delay calculation per TI's Equation 2 in the datasheet.
Is the TPS3840PL31DBVRQ1 qualified for automotive applications?
Yes. The TPS3840PL31DBVRQ1 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 explicitly intended for automotive head units, clusters, displays, and telematics systems per its device family documentation.
What is the function of the MR pin on the TPS3840PL31DBVRQ1?
The MR (Manual Reset) pin on the TPS3840PL31DBVRQ1 is an active-low input that forces RESET assertion regardless of VDD level when pulled ≤600 mV. When released (floated or raised ≥0.7×VDD), RESET deasserts after the programmed tD delay - enabling hardware-triggered system reset for service, diagnostics, or safe shutdown.
TPS3840PL31DBVRQ1 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:
- Push-Pull, Totem Pole
- 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
TPS3840PL31DBVRQ1 FAQ
1.How can I place an order for TPS3840PL31DBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL31DBVRQ1 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 TPS3840PL31DBVRQ1 reliable?
The price and inventory of TPS3840PL31DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL31DBVRQ1 is usually 5 days.
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TPS3840PL31DBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PL31DBVRQ1 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 TPS3840PL31DBVRQ1?
For technical support, including TPS3840PL31DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL31DBVRQ1 requirements.
6.How does Aetrix verify that TPS3840PL31DBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3840PL31DBVRQ1 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 TPS3840PL31DBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3840PL31DBVRQ1?
All TPS3840PL31DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL31DBVRQ1, 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 TPS3840PL31DBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3840PL31DBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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