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Texas Instruments TPS3840PL33DBVR
- Part No.:
- TPS3840PL33DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL33DBVR.pdf
- Description:
- NANOPOWER HIGH-INPUT VOLTAGE SUP
- Quantity:
- Payment:
- Shipping:
Inventory:2,954
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Product details
Overview
TPS3840PL33DBVR from Texas Instruments is an automotive-grade nano-IQ voltage supervisor with push-pull active-low RESET output, 3.3 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 in automotive infotainment and ADAS microcontroller power rails.
For engineers reviewing the TPS3840PL33DBVR datasheet, TPS3840PL33DBVR pinout, TPS3840PL33DBVR application, or TPS3840PL33DBVR equivalent, this page delivers verified electrical specs, SOT-23-5 pin functions, AEC-Q100 Grade 1 qualification details, and direct alternatives for automotive system-level reset design.
Technical Context
The TPS3840PL33DBVR implements a precision bandgap-referenced comparator with built-in hysteresis (100 mV typ. for 3.3 V threshold) and glitch-immune VDD monitoring logic. Its internal CT pin resistor (500 kΩ typ.) enables deterministic RC-based reset timing without external timing ICs.
It supports manual reset assertion via MR pin (VMR_L ≤ 600 mV), fast startup delay (≤350 µs), and operates across 1.5 V–10 V supply range while maintaining sub-µA quiescent current over –40°C to +125°C ambient - meeting automotive cold-crank and battery-droop requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 3.3 V ±1.5% max - ensures accurate detection of 3.3 V rail collapse before MCU brownout. |
| Quiescent Current | 350 nA typ., 700 nA max - enables multi-year battery backup operation in always-on automotive modules. |
| Reset Output Type | Push-pull active-low - drives RESET low directly without external pull-up; sinks 2 mA at VOL ≤ 200 mV. |
| Startup Delay | ≤350 µs - guarantees rapid, deterministic reset release after VDD exceeds VIT+. |
| Reset Delay Range | 50 µs (CT open) to 6.2 s (10 µF on CT) - supports flexible system boot sequencing and watchdog timeout extension. |
| Hysteresis | 100 mV typical - prevents oscillatory reset toggling during slow-rising or noisy VDD transitions. |
| Ambient Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and cockpit electronics. |
Pinout & Package
TPS3840PL33DBVR is housed in a 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 space-constrained automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives logic-low reset signal directly to MCU reset input; no external pull-up required. |
| 2: VDD | Supply and monitored rail input | Both powers the IC and serves as the voltage source being supervised; accepts 1.5–10 V. |
| 3: GND | Analog/digital ground reference | Common return path for internal comparator, bandgap, and output driver; must be low-impedance. |
| 4: MR | Active-low manual reset input | Pull to ≤600 mV to force immediate reset assertion; floating = disabled. |
| 5: CT | Capacitor time-delay programming node | Connect external capacitor (0–10 µF) to GND to set precise reset hold time; open = 50 µs min. |
Key Features
| Feature | Design Value |
|---|---|
| Nano-IQ operation | 350 nA typical supply current enables use in always-on vehicle networks without battery drain. |
| Factory-trimmed 3.3 V threshold | 1% typical accuracy ensures consistent reset point across production lots and temperature. |
| Programmable reset delay | RC-timed delay (50 µs–6.2 s) eliminates need for discrete timers or firmware delays. |
| Glitch-immune VDD sensing | 10 µs immunity to 5% overdrive transients prevents false resets during load dump or cranking. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with HBM ±2 kV and CDM ±750 V ESD robustness. |
Applications
| Automotive Head Unit Power Sequencing | ADAS Camera Module Supervision |
|---|---|
Use Scenario: Monitors 3.3 V I/O supply in head unit SoC to ensure clean boot before display initialization and audio codec enable. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET until VDD stabilizes above 3.3 V and remains there for ≥50 µs. Use Value: Prevents firmware lockup due to marginal 3.3 V rail; eliminates need for software-based reset polling. | Use Scenario: Guards 3.3 V sensor interface rail in rear-view camera module exposed to engine bay thermal cycling. IC Role / Device Role / Timing Role: Detects VDD droop below 3.3 V during cold crank and holds RESET low for 200 ms via 220 nF CT capacitor. Use Value: Ensures camera SoC fully reboots after battery recovery - avoids image corruption or blank screen. |
| Telematics Control Unit (TCU) Watchdog Backup | Automotive Cluster Microcontroller Reset |
Use Scenario: Provides hardware fallback reset when main TCU watchdog fails to refresh during OTA update or cellular handover. IC Role / Device Role / Timing Role: MR pin tied to watchdog output; asserts RESET if MR stays low >300 ns, independent of VDD state. Use Value: Adds fail-safe layer beyond software watchdog - meets ASIL-B functional safety decomposition. | Use Scenario: Supervises 3.3 V core supply feeding cluster MCU during ignition cycle and stop-start events. IC Role / Device Role / Timing Role: Generates 100 ms RESET pulse after VDD rises above 3.3 V + hysteresis, synchronized to ignition key position. Use Value: Guarantees deterministic MCU reset timing across battery voltage variations from 6 V to 16 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840DL33DBVR | Open-drain active-low RESET output; requires external pull-up resistor; lower VOL leakage (90 nA). | Suitable where level-shifting or wired-OR reset bus is needed; not ideal for direct MCU reset pin drive. | Select when interfacing with mixed-voltage systems or shared reset busses. |
| MAX6373US33D3+ | Fixed 3.3 V threshold, 1.6 µA IQ, 200 ms factory-fixed delay, SOT-23-5 package. | Lacks programmable delay and MR input; higher quiescent current limits battery-life-critical use. | Select only when fixed delay suffices and nano-IQ is not required. |
Compared with TPS3840DL33DBVR, the TPS3840PL33DBVR eliminates external pull-up components and simplifies layout; compared with MAX6373US33D3+, it offers 5× lower quiescent current and field-adjustable timing - critical for modern low-power automotive ECUs.
Availability
TPS3840PL33DBVR is available at Aetrix Electronics and suitable for automotive head units, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.
Supply support for TPS3840PL33DBVR 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 consumer markets.
The TPS3840-Q1 product line was designed specifically for automotive power-supply monitoring - combining ultra-low quiescent current, high-accuracy thresholds, and AEC-Q100 qualification to replace legacy reset ICs in next-generation ECU designs.
FAQ
What is the exact threshold voltage tolerance of the TPS3840PL33DBVR?
The TPS3840PL33DBVR has a fixed 3.3 V negative-going input threshold (VIT−) with ±1.5% maximum accuracy over –40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 100 mV (typical), ensuring stable reset release behavior during VDD ramp-up. This specification is validated per AEC-Q100 test conditions and appears in Section 7.5 of the official datasheet.
Can the TPS3840PL33DBVR operate from a 1.8 V supply?
Yes, the TPS3840PL33DBVR supports input supply voltages from 1.5 V to 10 V, so it functions correctly at 1.8 V. However, its 3.3 V threshold is fixed and referenced to its own VDD - meaning it monitors whether *its* VDD rail drops below 3.3 V. At 1.8 V supply, the device will assert RESET immediately and remain asserted, since VDD < VIT−. It is intended to monitor rails ≥3.3 V.
How do I calculate the reset delay when using a capacitor on the CT pin of the TPS3840PL33DBVR?
The reset delay tD for the TPS3840PL33DBVR is calculated using tD = −ln(0.29) × RCT × CCT_EXT + tD(no cap), where RCT = 500 kΩ (typical), tD(no cap) = 50 µs, and CCT_EXT is the external capacitor in farads. For example, a 100 nF capacitor yields ~230 ms delay. Equation 2 and Figure 39 in the datasheet provide full derivation and empirical validation across temperature.
Is the TPS3840PL33DBVR pin-compatible with other members of the TPS3840-Q1 family?
Yes - all TPS3840-Q1 variants (PL, DL, PH) in the DBV (SOT-23-5) package share identical pinout: Pin 1 = RESET, Pin 2 = VDD, Pin 3 = GND, Pin 4 = MR, Pin 5 = CT. The TPS3840PL33DBVR can be substituted for TPS3840DL33DBVR or TPS3840PH33DBVR at the board level, though output logic polarity and drive strength differ and must be verified in the target circuit.
Does the TPS3840PL33DBVR require a bypass capacitor on VDD?
Yes, TI recommends a 0.1 µF to 1 µF ceramic bypass capacitor placed as close as possible to the VDD and GND pins of the TPS3840PL33DBVR. This stabilizes the internal regulator and bandgap reference during fast VDD transients (e.g., load dump), prevents false resets, and ensures reliable startup - especially critical in automotive environments with high EMI and supply noise.
TPS3840PL33DBVR 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:
- 3.3V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 619ms Typical
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3840PL33DBVR FAQ
1.How can I place an order for TPS3840PL33DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL33DBVR 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 TPS3840PL33DBVR reliable?
The price and inventory of TPS3840PL33DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL33DBVR is usually 5 days.
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Once your TPS3840PL33DBVR 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 TPS3840PL33DBVR?
For technical support, including TPS3840PL33DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL33DBVR requirements.
6.How does Aetrix verify that TPS3840PL33DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PL33DBVR 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 TPS3840PL33DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PL33DBVR?
All TPS3840PL33DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL33DBVR, 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 TPS3840PL33DBVR part is unused and in its original packaging.
Return procedure for TPS3840PL33DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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