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Texas Instruments TPS3840PH30DBVRQ1
- Part No.:
- TPS3840PH30DBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PH30DBVRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3840PH30DBVRQ1 from Texas Instruments is an automotive-grade push-pull, active-high voltage supervisor IC designed for precise power-on reset and brownout detection in safety-critical systems. It features a fixed 3.0 V threshold (±1.5% max), 350 nA typical quiescent current, programmable reset delay up to 6.2 s via external capacitor on CT pin, and operates across 1.5 V to 10 V supply range. It is used in automotive display modules to ensure reliable microcontroller initialization after cold cranking.
For engineers reviewing the TPS3840PH30DBVRQ1 datasheet, TPS3840PH30DBVRQ1 pinout, TPS3840PH30DBVRQ1 application, or TPS3840PH30DBVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), active-high push-pull output topology, 3.0 V threshold accuracy, nano-IDD performance, and capacitor-programmable tD timing - all critical for low-power automotive power sequencing.
Technical Context
The TPS3840PH30DBVRQ1 implements a precision bandgap-based comparator with built-in hysteresis (100 mV typ. for 3.0 V threshold) and glitch-immune VDD sensing. Its internal state machine asserts RESET high when VDD falls below 3.0 V or MR is pulled low, and holds assertion for tD after VDD rises above 3.1 V and MR is released.
Unlike open-drain variants, the push-pull active-high output drives high without external pull-up, reducing BOM count and eliminating weak-pull uncertainty. The CT pin connects to an internal ~500 kΩ resistor, enabling accurate RC-based delay tuning from 50 µs (CT floating) to 6.2 s (10 µF to GND), with tSTRT ≤ 350 µs and tP_HL = 30 µs typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 3.0 V ±1.5% (max) - ensures deterministic reset assertion at precisely defined supply rail crossing, critical for SoC core voltage monitoring. |
| IDD Quiescent Current | 350 nA (typ), 700 nA (max) - enables multi-year battery backup operation in always-on automotive modules without compromising runtime. |
| Output Type | Push-pull, active-high - eliminates need for external pull-up resistor, simplifies PCB layout, and guarantees fast, rail-to-rail RESET drive strength. |
| tD Reset Delay Range | 50 µs (CT open) to 6.2 s (10 µF) - supports flexible power sequencing: short delays for fast-boot MCUs, long delays for FPGA configuration or EEPROM write cycles. |
| Ambient Temp Range | –40°C to +125°C - validated for under-hood and infotainment applications per AEC-Q100 Grade 1, with no derating required. |
| Hysteresis (VHYS) | 100 mV (typ) - prevents chatter during slow-rising/falling VDD transitions near 3.0 V, ensuring single, clean reset assertion/deassertion. |
| tP_HL Propagation Delay | 30 µs (typ) - guarantees rapid response to supply faults, meeting ASIL-B timing constraints for functional safety monitoring paths. |
Pinout & Package
TPS3840PH30DBVRQ1 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained automotive PCBs and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high push-pull output | Drives high during reset assertion; sinks current when deasserted. No external pull-up needed - reduces component count and layout risk. |
| 2 - VDD | Supply input & monitored rail | Power source for internal circuitry and the voltage being supervised; accepts 1.5 V–10 V, enabling direct monitoring of 3.3 V, 5 V, or 12 V domains. |
| 3 - GND | Analog/digital ground reference | Common return path for VDD, MR, CT, and RESET; must be low-impedance and separated from noisy digital grounds per layout guidelines. |
| 4 - MR | Active-low manual reset input | Pull low to force immediate RESET assertion; internally pulled up to VDD (~100 kΩ); floating = disabled. Immune to <300 ns glitches. |
| 5 - CT | Capacitor time-delay programming node | Connect external capacitor (0–10 µF) to GND to set tD; floating = minimum 50 µs delay. Internal ~500 kΩ RCT enables predictable RC timing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2 kV / CDM ±750 V ESD robustness - meets automotive reliability requirements out-of-box. |
| Programmable reset delay (tD) | 50 µs to 6.2 s via single external capacitor - replaces multiple fixed-delay supervisors and eliminates firmware-based timing dependencies. |
| 1% typical VIT− accuracy | ±1.5% max over full temperature range - enables tighter supply margining and eliminates need for calibration in production test. |
| Glitch-immune VDD sensing | 10 µs immunity to 5% overdrive transients - rejects noise spikes from switching regulators or load dumps without false resets. |
| Low VPOR (950 mV) | Ensures controlled RESET state during ultra-slow VDD ramp-up (e.g., battery recovery), preventing premature MCU release before stable supply. |
Applications
| Automotive Head Unit Power Sequencing | ADAS Camera Module Supervision |
|---|---|
Use Scenario: Ensures correct boot order of SoC, DDR memory, and display interface ICs after ignition or wake-up from sleep mode. IC Role / Device Role / Timing Role: Monitors 3.3 V I/O rail and asserts active-high RESET until rail stabilizes above 3.0 V + hysteresis, then holds for 200 ms (via 220 nF CT cap). Use Value: Prevents firmware lockup due to marginal power-up timing; eliminates need for discrete RC networks or CPLD-based sequencers. |
Use Scenario: Guarantees clean reset of image sensor and ISP during vehicle start-up or voltage sag from alternator ripple. IC Role / Device Role / Timing Role: Supervises 1.8 V core rail of CMOS image sensor; uses MR pin for system-initiated recalibration reset independent of VDD. Use Value: Enables deterministic sensor re-initialization without requiring host processor intervention - critical for ISO 26262 ASIL-B compliance. |
| Telematics Control Unit (TCU) Watchdog Enable | Automotive Cluster Microcontroller Reset |
Use Scenario: Provides primary power-good signal to enable TCU's communication watchdog timer only after all rails are stable. IC Role / Device Role / Timing Role: Active-high RESET output directly enables EN pin of secondary supervisor or watchdog IC; CT pin set for 1.2 s delay to cover modem boot sequence. Use Value: Eliminates race condition between modem firmware execution and watchdog activation - prevents spurious disconnects during field operation. |
Use Scenario: Resets instrument cluster MCU following battery disconnect/reconnect events or low-voltage conditions during engine cranking. IC Role / Device Role / Timing Role: Monitors 5 V supply feeding cluster MCU; asserts RESET high for 500 ms after VDD recovers to >3.1 V, ensuring full register initialization. Use Value: Avoids display artifacts or incorrect gauge readings caused by partial MCU boot - improves perceived quality and diagnostic reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL30DBVRQ1 | Same 3.0 V threshold and package, but push-pull active-low output | Requires logic inversion or level-shifting to interface with MCU reset inputs expecting active-high assertion | Select only if legacy design uses active-low reset architecture and board layout cannot accommodate signal inversion. |
| MAX6373HUT+T | 3.08 V threshold (±2.5%), 1.2 µA IDD, fixed 200 ms delay, SOT-23-5 | Lacks programmable delay and automotive qualification; not AEC-Q100 certified | Acceptable only for non-automotive industrial applications where nano-power and programmability are not required. |
Compared with TPS3840PL30DBVRQ1, the TPS3840PH30DBVRQ1 eliminates external inversion circuitry and simplifies firmware integration; compared with MAX6373HUT+T, it delivers 3.4× lower quiescent current, AEC-Q100 qualification, and field-tunable timing - making it the sole choice for new automotive designs demanding ASIL-compliant power supervision.
Availability
TPS3840PH30DBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, ADAS camera modules, and telematics control units requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for TPS3840PH30DBVRQ1 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 experience delivering high-reliability components for mission-critical systems.
The TPS3840-Q1 product line was engineered specifically for automotive power integrity monitoring, combining nano-power operation, precision thresholding, and programmable timing to replace discrete reset solutions in next-generation cockpit and ADAS ECUs.
FAQ
What is the exact threshold voltage of the TPS3840PH30DBVRQ1?
The TPS3840PH30DBVRQ1 has a factory-set negative-going input threshold (VIT−) of 3.0 V, with accuracy of ±1.5% maximum over –40°C to +125°C ambient temperature. This value is fixed and non-adjustable; the '30' in the part number explicitly denotes the 3.0 V variant within the TPS3840-Q1 family.
Does the TPS3840PH30DBVRQ1 require an external pull-up resistor on the RESET pin?
No, the TPS3840PH30DBVRQ1 features a push-pull active-high output stage, meaning the RESET pin actively drives high during assertion and sinks current when deasserted. Unlike open-drain variants, it requires no external pull-up resistor - simplifying schematic design and improving noise immunity.
How is the reset delay time (tD) programmed on the TPS3840PH30DBVRQ1?
The reset delay time (tD) is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor (CT floating), tD = 50 µs. Using a 10 µF capacitor yields up to 6.2 s delay. The internal CT resistance is ~500 kΩ, enabling predictable RC timing per TI's Equation 2 in the datasheet.
Is the TPS3840PH30DBVRQ1 qualified for automotive use?
Yes, the TPS3840PH30DBVRQ1 is AEC-Q100 qualified for Grade 1 (–40°C to +125°C ambient), with HBM ±2 kV and CDM ±750 V ESD ratings. It is explicitly intended for automotive applications including head units, clusters, displays, and telematics - as confirmed in the official TI datasheet SNVSBA1B.
What is the purpose of the MR pin on the TPS3840PH30DBVRQ1?
MR (Manual Reset) is an active-low input that forces immediate RESET assertion regardless of VDD level. Pulling MR below 600 mV (VMR_L) triggers reset; releasing it allows deassertion after tD expires, provided VDD > VIT+. MR is internally pulled up to VDD (~100 kΩ) and may be left floating when unused.
TPS3840PH30DBVRQ1 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:
- 3V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- 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
TPS3840PH30DBVRQ1 FAQ
1.How can I place an order for TPS3840PH30DBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PH30DBVRQ1 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 TPS3840PH30DBVRQ1 reliable?
The price and inventory of TPS3840PH30DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PH30DBVRQ1 is usually 5 days.
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Once your TPS3840PH30DBVRQ1 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 TPS3840PH30DBVRQ1?
For technical support, including TPS3840PH30DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PH30DBVRQ1 requirements.
6.How does Aetrix verify that TPS3840PH30DBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3840PH30DBVRQ1 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 TPS3840PH30DBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3840PH30DBVRQ1?
All TPS3840PH30DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PH30DBVRQ1, 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 TPS3840PH30DBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3840PH30DBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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