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Texas Instruments TPS3840PL45DBVR
- Part No.:
- TPS3840PL45DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL45DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,546
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Product details
Overview
TPS3840PL45DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-low reset output, 4.5 V fixed threshold (±1.5% max), 300 nA typical supply current, and user-programmable reset delay via external capacitor on CT pin. It monitors power rails in battery-backed or industrial systems where ultra-low quiescent current and precise voltage supervision are critical.
For engineers reviewing the TPS3840PL45DBVR datasheet, TPS3840PL45DBVR pinout, TPS3840PL45DBVR application, or TPS3840PL45DBVR equivalent, this page delivers verified electrical parameters, SOT-23-5 package mapping, functional pin roles, real-world use cases in grid infrastructure and portable electronics, and two validated alternative parts with documented technical differences.
Technical Context
The TPS3840PL45DBVR implements a precision bandgap-based comparator with built-in hysteresis (100 mV typ. for 4.5 V threshold) and glitch immunity on both VDD and MR inputs. Its internal CT pin resistor (500 kΩ typ.) forms an RC timing network with external capacitors to generate reset delays from 50 µs to 6.2 s.
It operates across –40°C to +125°C with 1.5 V to 10 V supply range, supports fast startup delay (220 µs typ.), and features low-power-on-reset (VPOR = 300 mV) to prevent false resets during slow-ramp power-up sequences in safety-critical applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 10 V - enables direct monitoring of 9 V batteries or 24 V rails (with external divider), eliminating need for LDO pre-regulation |
| Threshold Voltage (VIT−) | 4.5 V ±1.5% max - factory-trimmed fixed threshold ensures consistent brownout detection without external resistors |
| Quiescent Current (IDD) | 300 nA typ., 700 nA max - extends battery life in always-on IoT sensors and portable medical devices |
| Reset Delay Range (tD) | 50 µs (CT floating) to 6.2 s (10 µF) - programmable timing allows system-specific reset hold duration without firmware involvement |
| Startup Delay (tSTRT) | 220 µs typ., 350 µs max - detects supply faults before downstream logic powers up, enhancing system safety at power-on |
| Output Type | Push-pull, active-low RESET - drives loads directly without pull-up resistor, reducing BOM count and board space vs open-drain variants |
| Operating Temperature | –40°C to +125°C - qualified for industrial automation, smart metering, and automotive under-hood auxiliary circuits |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm footprint, surface-mount, thermally enhanced plastic body with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives logic-low reset signal directly to microcontroller / FPGA / ASIC; sinks 2 mA @ 200 mV VOL; no external pull-up required |
| 2: VDD | Power input & monitored rail | Supplies internal circuitry and serves as the voltage being supervised; accepts 1.5–10 V with no external components needed for 9 V battery monitoring |
| 3: GND | Reference ground | Common return path for internal comparator, reset driver, and timing circuitry; must be low-impedance for stable hysteresis and glitch immunity |
| 4: MR | Manual reset input | Logic-low assertion (≤600 mV) forces immediate RESET assertion; internally pulled up to ~100 kΩ; compatible with 1.8 V/3.3 V GPIOs |
| 5: CT | Capacitor time-delay control | Connects to external capacitor (0–10 µF) to set reset hold time; floating = minimum 50 µs delay; internal 500 kΩ resistor sets RC time constant |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300 nA typical supply current enables >10-year battery life in coin-cell-powered smoke detectors and remote sensors |
| Factory-trimmed 4.5 V threshold | ±1.5% max accuracy over temperature eliminates calibration overhead and reduces design validation effort |
| Programmable reset delay | Wide 50 µs–6.2 s range via single external capacitor simplifies timing customization without firmware or additional ICs |
| Glitch-immune MR and VDD inputs | 10 µs minimum pulse rejection on MR and 15 µs on VDD prevents spurious resets from EMI or switching noise |
| Push-pull active-low output | Eliminates need for external pull-up resistor, reducing component count, PCB area, and potential leakage paths in high-impedance systems |
Applications
| Smart Meter Power Monitoring | Portable Medical Sensor |
|---|---|
Use Scenario: Monitors 3.3 V or 4.5 V supply rails in utility smart meters during grid voltage sags or battery backup transitions. IC Role / Device Role / Timing Role: Supervisor IC asserting active-low RESET to MCU when VDD drops below 4.5 V, with 200 ms delay to tolerate brief dips. Use Value: Prevents corrupted firmware execution during brownout by holding MCU in reset until stable supply returns - enabled by programmable tD and 1.5% threshold accuracy. | Use Scenario: Powers continuous glucose monitor (CGM) with coin-cell battery; requires ultra-low IQ to maximize operational lifetime. IC Role / Device Role / Timing Role: Nano-power supervisor detecting end-of-battery voltage (4.5 V threshold) and triggering graceful shutdown sequence via RESET. Use Value: 300 nA IDD extends usable battery life by >30% vs µA-class supervisors, while VPOR = 300 mV ensures reliable reset assertion even during slow battery discharge. |
| Industrial PLC I/O Module | Fire Alarm Control Panel |
Use Scenario: Supervises 5 V or 9 V auxiliary rails in programmable logic controller modules operating in harsh factory environments. IC Role / Device Role / Timing Role: High-temperature supervisor (–40°C to +125°C) asserting RESET on undervoltage, with MR pin tied to watchdog timer output. Use Value: Built-in hysteresis (100 mV) prevents oscillatory reset toggling near threshold during noisy 24 V DC supply transients. | Use Scenario: Ensures fail-safe operation in fire alarm panels where loss of main AC supply triggers battery backup and system reinitialization. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 9 V battery voltage (VDD) and accepts manual reset from panel keypad (MR pin). Use Value: Push-pull output drives reset line directly into microcontroller without pull-up, improving noise immunity in electrically noisy fire alarm enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL42DBVR | 4.2 V fixed threshold (vs. 4.5 V); otherwise identical specs, pinout, and package | Used where system brownout threshold must be lower - e.g., 4.3 V LDO output monitoring | Select when exact 4.5 V trip point is not required and 4.2 V better matches downstream regulator dropout |
| MAX6374US45+T | 4.5 V threshold, but 1.5 µA IQ (5× higher), SOT-23-5, no MR pin, fixed 200 ms reset delay | Lacks manual reset and programmable delay; suited for cost-sensitive, non-field-serviceable consumer devices | Choose only if programmability and MR are unnecessary and higher IQ is acceptable for shorter battery life |
Compared with TPS3840PL45DBVR, TPS3840PL42DBVR offers identical functionality at a different threshold, enabling fine-grained voltage margin tuning; MAX6374US45+T trades programmability and nano-power for lower unit cost and simpler implementation in fixed-timing applications.
Availability
TPS3840PL45DBVR is available at Aetrix Electronics and suitable for smart metering, portable medical sensors, industrial PLC I/O modules, and fire alarm control panels requiring stable component supply and long-term manufacturability.
Supply support for TPS3840PL45DBVR 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 industrial, automotive, and personal electronics markets.
The TPS3840 family was designed specifically for ultra-low-power, high-accuracy voltage supervision in battery-operated and energy-conscious industrial systems - emphasizing nano-IQ, wide-VIN capability, and field-programmable timing.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840PL45DBVR?
The TPS3840PL45DBVR has a factory-trimmed negative-going input threshold (VIT−) of 4.5 V with ±1.5% maximum accuracy over –40°C to +125°C. Typical accuracy is ±1%, and hysteresis is 100 mV (typical) - ensuring stable release above 4.6 V and preventing chatter near the trip point.
Does the TPS3840PL45DBVR require an external pull-up resistor on the RESET pin?
No, the TPS3840PL45DBVR uses a push-pull active-low output architecture, so the RESET pin drives both high and low states internally. Unlike open-drain variants (e.g., TPS3840DL45DBVR), it does not require an external pull-up resistor - simplifying layout and reducing component count.
How is the reset time delay programmed on the TPS3840PL45DBVR?
The reset time delay (tD) on the TPS3840PL45DBVR is set 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 ~6.2 s delay. The relationship follows tD ≈ 618937 × CCT + 50 µs, where CCT is in farads.
Can the TPS3840PL45DBVR monitor a 24 V rail directly?
No - the absolute maximum VDD rating is 12 V. To supervise a 24 V rail, an external resistor divider must scale the voltage down to ≤10 V at the VDD pin. The TPS3840PL45DBVR's wide 1.5–10 V operating range and nano-IQ make it ideal for such scaled monitoring, minimizing divider current loss.
What is the purpose of the MR pin on the TPS3840PL45DBVR?
The MR (Manual Reset) pin on the TPS3840PL45DBVR allows external logic - such as a microcontroller GPIO or watchdog timer - to force a system reset by pulling the pin low (≤600 mV). It features internal ~100 kΩ pull-up, so it may be left unconnected when unused, and supports pulse widths ≥300 ns for reliable assertion.
TPS3840PL45DBVR 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.5V
- 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
TPS3840PL45DBVR FAQ
1.How can I place an order for TPS3840PL45DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL45DBVR 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 TPS3840PL45DBVR reliable?
The price and inventory of TPS3840PL45DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL45DBVR is usually 5 days.
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TPS3840PL45DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PL45DBVR 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 TPS3840PL45DBVR?
For technical support, including TPS3840PL45DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL45DBVR requirements.
6.How does Aetrix verify that TPS3840PL45DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PL45DBVR 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 TPS3840PL45DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PL45DBVR?
All TPS3840PL45DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL45DBVR, 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 TPS3840PL45DBVR part is unused and in its original packaging.
Return procedure for TPS3840PL45DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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