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Texas Instruments TPS3840DL42DBVRQ1
- Part No.:
- TPS3840DL42DBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL42DBVRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3840DL42DBVRQ1 from Texas Instruments is an automotive-grade nano-IQ voltage supervisor with open-drain active-low RESET output, 4.2 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 TPS3840DL42DBVRQ1 datasheet, TPS3840DL42DBVRQ1 pinout, TPS3840DL42DBVRQ1 application, or TPS3840DL42DBVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), 100 mV hysteresis at 4.2 V threshold, 350 µs max startup delay, and SOT-23-5 (DBV) package compatibility with space-constrained automotive PCB layouts.
Technical Context
The TPS3840DL42DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis and glitch immunity on VDD, enabling robust monitoring of 1.5 V–10 V supply rails. Its CT pin interfaces with an external capacitor to set reset timeout via an internal 500 kΩ resistor (typ), while MR provides asynchronous manual reset assertion independent of VDD state.
It operates in two distinct functional modes: (1) automatic reset assertion when VDD falls below 4.2 V (VIT−) or rises above VIT+ (4.3 V), and (2) manual reset assertion via MR low pulse ≥300 ns, with deassertion delayed by tD after MR release and VDD recovery - all with propagation delay ≤30 µs (tP_HL) and no external pull-up required for open-drain operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 4.2 V ±1.5% (max) - ensures accurate brownout detection at nominal 4.2 V rail, e.g., for automotive 5 V LDO outputs or battery-sensed systems |
| Quiescent Current | 350 nA (typ), 700 nA (max) - enables multi-year battery life in always-on vehicle modules without compromising supervision integrity |
| Hysteresis | 100 mV (typ) - prevents oscillatory reset toggling during slow-rising/falling VDD transitions near 4.2 V |
| Startup Delay | 350 µs (max) - guarantees deterministic reset release after power stabilization, critical for MCU boot sequence timing |
| Reset Delay Range | 50 µs (no cap) to 6.2 s (10 µF) - supports flexible system-level reset hold times across microcontroller, FPGA, and PMIC use cases |
| Output Type | Open-drain active-low - allows wired-OR reset bus configuration and interface with any logic-voltage pull-up (1.8 V–10 V) |
| ESD Rating | HBM ±2000 V, CDM ±750 V - meets automotive manufacturing ESD robustness requirements per AEC-Q100 |
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 VOL ≤200 mV; leakage <90 nA when high-impedance |
| 2: VDD | Supply and monitored input | Input voltage range 1.5 V–10 V; powers internal circuitry; monitored for threshold violation |
| 3: GND | Analog/digital ground reference | Common return path for VDD, MR, CT; must be low-impedance connection to system ground plane |
| 4: MR | Active-low manual reset input | Pull ≤600 mV to assert reset; internally pulled up to VDD (~100 kΩ); compatible with 1.8 V/3.3 V/5 V logic |
| 5: CT | Capacitor time-delay programming node | Connect external capacitor (0–10 µF) to GND to set tD; floating = 50 µs min delay; internal RCT ≈500 kΩ |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - suitable for under-hood and cockpit electronics without derating |
| Programmable reset delay via CT pin | Enables precise system-level reset timing control using only one passive component - eliminates need for external timers or firmware delays |
| 1% typical threshold accuracy | Reduces design margin requirements on supply rails - allows tighter VDD tolerance budgets in cost-sensitive automotive modules |
| Glitch immunity on VDD | Rejects transients ≤10 µs at 5% overdrive - prevents false resets during load dump or switching noise events |
| Low-power POR (VPOR = 950 mV) | Guarantees valid reset assertion even during ultra-slow VDD ramp-up - essential for battery-backed or energy-harvesting subsystems |
Applications
| Automotive Head Unit Power Sequencing | ADAS Domain Controller Brownout Protection |
|---|---|
Use Scenario: Monitors 5 V supply to infotainment SoC and audio codecs during ignition cycling and accessory mode transitions. IC Role / Device Role / Timing Role: Voltage supervisor providing power-on reset and brownout detection with 4.2 V threshold aligned to 5 V LDO dropout margin. Use Value: Prevents corrupted boot sequences by holding RESET until VDD stabilizes >4.3 V and sustains tD delay - eliminating MCU lockups during cold cranking. | Use Scenario: Supervises 3.3 V core rail of radar processor in autonomous driving ECU exposed to wide temperature and EMI stress. IC Role / Device Role / Timing Role: Nano-IQ supervisor asserting open-drain RESET to multiple downstream ICs during transient dips below 4.2 V. Use Value: 350 nA quiescent current avoids battery drain in parked mode; 100 mV hysteresis prevents chatter during 100 mV ripple on 3.3 V rail. |
| Telematics Control Unit (TCU) Safe Boot | Automotive Display Cluster Reset Coordination |
Use Scenario: Ensures LTE modem, GNSS receiver, and CAN gateway initialize only after stable 4.2 V backup supply is confirmed post-battery disconnect/reconnect. IC Role / Device Role / Timing Role: Manual-reset-enabled supervisor allowing firmware-triggered safe reboot via MR pin while maintaining VDD supervision. Use Value: MR pulse ≥300 ns initiates controlled reset without VDD interruption; tD delay configurable to match modem boot handshake timing. | Use Scenario: Coordinates power-up sequencing between display driver ASIC, touch controller, and backlight LED driver in digital instrument cluster. IC Role / Device Role / Timing Role: Open-drain RESET output shared across multiple ICs via single pull-up, enabling synchronized reset release. Use Value: Wired-OR capability eliminates need for discrete OR-gate logic; 2 mA sink strength drives long PCB traces to distributed loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL42DBVRQ1 | Push-pull active-low output; no external pull-up required; higher VOL (200 mV @ 2 mA) vs. open-drain leakage-limited high state | Better for point-to-point reset signaling where bus sharing is unnecessary; unsuitable for wired-OR configurations | Select when board layout lacks space for pull-up resistor or when driving capacitive loads >50 pF directly |
| TLV809E42DBZRQ1 | Fixed 4.2 V threshold, SOT-23-3, no MR or CT pins; 600 nA IQ; 1.5% accuracy; push-pull active-low | Lacks manual reset and programmable delay - limited to basic POR/brownout without timing flexibility | Select only for cost-optimized, space-constrained designs requiring minimal feature set and no MR/CT functionality |
Compared with TPS3840PL42DBVRQ1, the TPS3840DL42DBVRQ1 enables shared reset buses and mixed-voltage interfacing; compared with TLV809E42DBZRQ1, it adds critical automotive features - MR, programmable tD, and lower IQ - at the cost of two extra pins and slightly larger footprint.
Availability
TPS3840DL42DBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, ADAS domain controllers, and telematics control units requiring stable component supply with full AEC-Q100 compliance and long-term production support.
Supply support for TPS3840DL42DBVRQ1 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 designed specifically for automotive power management systems requiring ultra-low quiescent current, high-accuracy voltage monitoring, and robust reset timing control under harsh environmental conditions.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840DL42DBVRQ1?
The TPS3840DL42DBVRQ1 has a factory-set negative-going input threshold (VIT−) of 4.2 V with ±1.5% maximum accuracy over –40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 100 mV (typical), resulting in VIT+ = 4.3 V. This specification is verified per TI's production test flow and documented in Section 7.5 of the SNVSBA1B datasheet.
Does the TPS3840DL42DBVRQ1 require an external pull-up resistor on the RESET pin?
Yes, the TPS3840DL42DBVRQ1 uses an open-drain active-low RESET output and requires an external pull-up resistor to the desired logic voltage (1.8 V–10 V). A 100 kΩ resistor is recommended per datasheet test conditions; pull-up value affects rise time and noise immunity but not threshold behavior. The TPS3840DL42DBVRQ1 itself draws no current through RESET in high-impedance state.
How is the reset delay time (tD) programmed on the TPS3840DL42DBVRQ1?
The reset delay time (tD) on the TPS3840DL42DBVRQ1 is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, tD = 50 µs (included in startup delay). Using a 10 µF capacitor yields tD ≈ 6.2 s. The relationship follows tD = −ln(0.29) × RCT × CCT_EXT + 50 µs, where RCT ≈ 500 kΩ (typ). Capacitor tolerance and temperature drift directly impact tD accuracy.
Is the TPS3840DL42DBVRQ1 qualified for automotive applications?
Yes, the TPS3840DL42DBVRQ1 is AEC-Q100 qualified for automotive applications (Grade 1: –40°C to +125°C ambient), with HBM ESD rating ±2000 V and CDM rating ±750 V. It is manufactured in TI's certified automotive facilities and supported by PPAP documentation, failure mode analysis, and long-term reliability data per the SNVSBA1B datasheet revision history.
Can the MR pin of the TPS3840DL42DBVRQ1 be left unconnected?
Yes, the MR pin of the TPS3840DL42DBVRQ1 has an internal ~100 kΩ pull-up to VDD and may be left floating when manual reset functionality is unused. In that state, MR remains at VMR_H (>0.7×VDD), preventing unintended reset assertion. If driven externally, MR must be pulled below 600 mV (VMR_L) for ≥300 ns to trigger reset - compatible with standard logic families.
TPS3840DL42DBVRQ1 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:
- 4.2V
- 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
TPS3840DL42DBVRQ1 FAQ
1.How can I place an order for TPS3840DL42DBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL42DBVRQ1 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 TPS3840DL42DBVRQ1 reliable?
The price and inventory of TPS3840DL42DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL42DBVRQ1 is usually 5 days.
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Once your TPS3840DL42DBVRQ1 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 TPS3840DL42DBVRQ1?
For technical support, including TPS3840DL42DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL42DBVRQ1 requirements.
6.How does Aetrix verify that TPS3840DL42DBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3840DL42DBVRQ1 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 TPS3840DL42DBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3840DL42DBVRQ1?
All TPS3840DL42DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL42DBVRQ1, 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 TPS3840DL42DBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3840DL42DBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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