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Texas Instruments TPS3840DL24DBVR
- Part No.:
- TPS3840DL24DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL24DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,274
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Product details
Overview
TPS3840DL24DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with active-low open-drain reset output, 2.4V fixed threshold (±1.5% max), 300nA typical supply current, and programmable reset delay up to 6.2s via external capacitor on CT pin. It operates from 1.5V to 10V and supports industrial temperature range (–40°C to +125°C), used for reliable power-on-reset and brownout detection in battery-powered and high-voltage monitoring systems.
For engineers reviewing the TPS3840DL24DBVR datasheet, TPS3840DL24DBVR pinout, TPS3840DL24DBVR application, or TPS3840DL24DBVR equivalent, this page delivers verified specifications, SOT-23-5 package details, functional pin roles, real-world use cases in grid infrastructure and portable electronics, and two validated alternative parts with technical and application-level distinctions.
Technical Context
The TPS3840DL24DBVR implements a precision voltage comparator with built-in hysteresis (100mV typical for VIT− = 2.4V), glitch-immune VDD sensing, and a dedicated CT pin that forms an RC timing network with external capacitance to set reset assertion duration. Its internal bandgap reference and low-leakage design enable stable threshold accuracy across –40°C to +125°C.
Reset assertion occurs when VDD falls below 2.4V or MR is pulled low; release requires VDD to rise above 2.4V + hysteresis *and* expiration of the programmed tD. The open-drain RESET output requires an external pull-up and supports bidirectional voltage translation, making it compatible with mixed-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 2.4V ±1.5% max - ensures precise brownout detection at nominal 2.4V rail without calibration |
| IDD Supply Current | 300nA typical - extends battery life in always-on monitoring applications |
| Hysteresis (VHYS) | 100mV typical - prevents chatter during slow-rising/falling VDD transitions |
| tSTRT Startup Delay | 220µs typical - enables fast fault detection before system initialization completes |
| tD Reset Delay Range | 50µs (CT floating) to 6.2s (10µF) - supports flexible system reset timing without firmware intervention |
| Operating Voltage | 1.5V to 10V - monitors 3.3V, 5V, 9V rails directly; 24V rails with external resistor divider |
| Temperature Range | –40°C to +125°C - qualified for industrial and grid-edge environments |
Pinout & Package
SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, surface-mount, thermally enhanced with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain active-low output | Asserts low during fault or MR event; requires external pull-up; supports voltage-level shifting |
| 2: VDD | Supply and monitored input | Input voltage source and monitored rail; powers internal circuitry; no external regulator needed |
| 3: GND | Analog and digital ground | Common reference for comparator, bandgap, and output stage; must be low-impedance |
| 4: MR | Active-low manual reset input | Pull low ≥300ns to force reset; internally pulled up to ~100kΩ; floatable when unused |
| 5: CT | Capacitor time-delay programming node | Connects to GND via external capacitor (0–10µF) to set tD; floating = minimum 50µs delay |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300nA typical IDD enables multi-year battery life in wireless sensors and IoT endpoints |
| Factory-trimmed 2.4V threshold | ±1.5% max accuracy over temperature eliminates need for external resistor networks |
| Programmable reset delay | Wide 50µs–6.2s range via single external capacitor simplifies timing design vs. discrete RC or microcontroller-based delays |
| Glitch-immune VDD sensing | 10µs immunity to transients ≥5% overdrive prevents false resets in noisy power environments |
| Open-drain RESET output | Supports mixed-voltage systems (e.g., 3.3V supervisor driving 5V logic) with external pull-up flexibility |
Applications
| Smart Meter Power Monitoring | Portable Medical Device Supervision |
|---|---|
Use Scenario: Monitors 3.3V or 5V MCU supply in ANSI C12.22-compliant smart meters during grid voltage sags or surges. IC Role / Device Role / Timing Role: Voltage supervisor asserting open-drain RESET to halt metering processor and preserve flash integrity during brownout. Use Value: 2.4V threshold aligns with MCU VCC brownout level; 100mV hysteresis prevents oscillation during slow AC line recovery. | Use Scenario: Ensures safe startup and shutdown sequencing in handheld glucose meters powered by single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Nano-power supervisor enabling >5-year shelf life; asserts RESET until battery reaches 2.4V after cold storage. Use Value: 300nA IDD minimizes self-discharge; programmable tD allows configurable hold-off during battery warm-up. |
| Industrial PLC I/O Module | Fire Alarm Control Panel |
Use Scenario: Supervises isolated 24V DC input power in DIN-rail mounted PLC modules operating in factory environments. IC Role / Device Role / Timing Role: High-voltage supervisor (via resistor divider) detecting undervoltage on 24V bus; triggers system-wide reset via MR-linked watchdog. Use Value: 10V absolute max rating and 1.5–10V operating range support direct 24V monitoring with standard 10:1 divider; –40°C to +125°C rating matches industrial thermal envelope. | Use Scenario: Provides fail-safe power supervision for smoke detector microcontrollers in NFPA 72-certified fire alarm panels. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 12V backup battery and asserts RESET if voltage drops below 2.4V; MR pin tied to smoke sensor interrupt. Use Value: Active-low MR enables immediate hardware reset upon smoke detection; open-drain output interfaces safely with panel's 5V logic without level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL24DBVR | Push-pull active-low RESET output; no external pull-up required; higher VOL (200mV @ 2mA) | Better for high-speed, low-impedance reset buses where pull-up resistors add noise or delay | Select when board layout lacks space for pull-up or when driving heavy capacitive loads (>100pF) |
| MAX6326UR24+T | Fixed 2.4V threshold, 1.6µA IDD, SOT23-5, no programmable delay; 125°C max temp | Lacks CT-programmable delay; simpler timing but less flexible for diverse reset requirements | Select when deterministic 200ms fixed delay suffices and ultra-low quiescent current is not critical |
Compared with TPS3840PL24DBVR, the TPS3840DL24DBVR trades off external component count for greater voltage translation flexibility; compared with MAX6326UR24+T, it offers 5.3× lower supply current and field-adjustable reset timing-critical for energy-constrained and multi-platform designs.
Availability
TPS3840DL24DBVR is available at Aetrix Electronics and suitable for grid infrastructure monitoring, portable medical devices, industrial PLC modules, and fire safety systems requiring stable component supply, long-lifecycle assurance, and consistent parametric performance.
Supply support for TPS3840DL24DBVR 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-voltage rail supervision in battery-backed and grid-connected equipment where precision thresholding, programmable timing, and extended temperature operation are mandatory.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840DL24DBVR?
The TPS3840DL24DBVR has a factory-set negative-going input threshold (VIT−) of 2.4V with ±1.5% maximum accuracy over –40°C to +125°C and 1% typical accuracy at 25°C. Hysteresis is 100mV typical, yielding a VIT+ of 2.5V. This ensures robust detection of 2.4V rail faults without calibration or trimming circuits.
How does the CT pin function in the TPS3840DL24DBVR?
The CT pin on the TPS3840DL24DBVR sets the reset time delay (tD) by forming an RC network with an external capacitor to GND. With no capacitor (floating), tD is 50µs minimum. A 10µF capacitor yields ~6.2s maximum delay. Internal RCT is 500kΩ typical; tD = 618937 × CEXT + 50µs. The TPS3840DL24DBVR uses this to provide hardware-configurable reset hold times independent of firmware.
Can the TPS3840DL24DBVR monitor a 24V supply directly?
No-the TPS3840DL24DBVR has a 10V absolute maximum rating on VDD. To monitor a 24V rail, use a precision resistor divider (e.g., 10:1) to scale 24V down to ≤10V at the VDD pin. The TPS3840DL24DBVR's 1.5–10V operating range and nano-power consumption make it ideal for such high-voltage supervision with minimal loading on the divider.
What is the role of the MR pin in the TPS3840DL24DBVR?
The MR pin on the TPS3840DL24DBVR is an active-low manual reset input. Pulling MR below VMR_L (600mV max) for ≥300ns forces immediate RESET assertion, regardless of VDD level. When released, RESET remains asserted until VDD rises above VIT+ (2.5V) *and* the programmed tD expires. An internal 100kΩ pull-up allows MR to float when unused.
Is the TPS3840DL24DBVR pin-compatible with other TPS3840 variants?
Yes-the TPS3840DL24DBVR shares identical SOT-23-5 (DBV) pinout and footprint with all TPS3840 family members, including TPS3840PL24DBVR and TPS3840PH24DBVR. Pin 1 is RESET, Pin 2 is VDD, Pin 3 is GND, Pin 4 is MR, and Pin 5 is CT. Only the output topology (open-drain vs. push-pull) and threshold voltage differ between variants; PCB layout is fully reusable.
TPS3840DL24DBVR 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:
- 2.4V
- Output:
- Open Drain or Open Collector
- 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
TPS3840DL24DBVR FAQ
1.How can I place an order for TPS3840DL24DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL24DBVR 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 TPS3840DL24DBVR reliable?
The price and inventory of TPS3840DL24DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL24DBVR is usually 5 days.
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TPS3840DL24DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840DL24DBVR 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 TPS3840DL24DBVR?
For technical support, including TPS3840DL24DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL24DBVR requirements.
6.How does Aetrix verify that TPS3840DL24DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840DL24DBVR 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 TPS3840DL24DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840DL24DBVR?
All TPS3840DL24DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL24DBVR, 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 TPS3840DL24DBVR part is unused and in its original packaging.
Return procedure for TPS3840DL24DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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