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Texas Instruments LM3724IM5-3.08/NOPB
- Part No.:
- LM3724IM5-3.08/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3724IM5-3.08/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:18,587
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Product details
Overview
LM3724IM5-3.08/NOPB from Texas Instruments is a precision 3.08 V active-low open-drain microprocessor reset supervisor IC in SOT-23-5 package, monitoring 3.3 V supply rails with ±1.5% threshold accuracy, 190 ms typical reset timeout, and guaranteed operation down to VCC ≥1 V. It provides brown-out, power-up, and manual reset assertion for embedded controllers and battery-powered systems.
For engineers reviewing the LM3724IM5-3.08/NOPB datasheet, LM3724IM5-3.08/NOPB pinout, LM3724IM5-3.08/NOPB application, or LM3724IM5-3.08/NOPB equivalent, key selection criteria include its open-drain output architecture, industrial temperature range (−40°C to +85°C), low 6 µA supply current, and compatibility with MAX811/812-based designs requiring reset hold time and MR debouncing.
Technical Context
The LM3724IM5-3.08/NOPB integrates a precision voltage reference (1.225 V), dual comparators (reset threshold and manual reset), and a one-shot timer that guarantees ≥100 ms reset pulse width after VCC rises above 3.08 V. Its internal 22 kΩ MR pull-up enables direct switch interfacing without external components.
As an open-drain device, LM3724IM5-3.08/NOPB requires an external pull-up resistor-configurable to any logic rail up to 5.5 V-enabling level translation, wired-OR reset bus implementation, and interoperability across mixed-voltage systems. Reset assertion occurs on VCC drop below 3.08 V or MR low pulse ≥10 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±1.5% - precisely monitors nominal 3.3 V supplies within industry-standard tolerance bands |
| Reset Timeout | 190 ms typical - ensures sufficient initialization window for microcontrollers before release |
| Supply Current | 6 µA typical at 3.6 V - enables multi-year battery life in portable instrumentation |
| VCC Operating Range | 1.0 V to 5.5 V - guarantees valid RESET output even during deep brown-out conditions |
| MR Input Logic | VIH = 0.7×VCC, VIL = 0.25×VCC - supports direct connection to 3.3 V or 5 V logic without level shifters |
| Output Type | Active-low open-drain - allows shared reset bus, flexible pull-up voltage selection, and noise-immune wired-OR |
| Temperature Range | −40°C to +85°C - qualified for industrial environments without derating |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.45 mm body, gull-wing leads, RoHS-compliant matte tin (Sn) finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference and substrate connection - must be tied directly to system ground plane |
| 2 | GND | Second ground terminal - improves thermal dissipation and reduces ground bounce in noisy environments |
| 3 | RESET | Active-low open-drain output - requires external pull-up; sinks ≥1.2 mA at VCC ≥ VTH min |
| 4 | MR | Manual reset input - internally pulled up to VCC via 22 kΩ; asserts reset when pulled ≤0.25×VCC |
| 5 | VCC | Supply input - accepts 1.0–5.5 V; powers internal reference, comparators, and timing circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08 V threshold | ±1.5% over −40°C to +85°C - eliminates need for external trimming in 3.3 V systems |
| Open-drain RESET output | Supports multi-source reset buses and logic-level translation up to 5.5 V - no additional gates required |
| Guaranteed operation down to VCC = 1 V | Ensures deterministic reset behavior during severe brown-out - prevents undefined MCU states |
| Internal MR pull-up | 22 kΩ resistor enables direct pushbutton interface - eliminates external component count |
| Power supply transient immunity | Rejects <40 µs negative transients ≥125 mV below threshold - enhances reliability in electrically noisy systems |
Applications
| Industrial Controller Power Sequencing | Portable Medical Sensor Node |
|---|---|
|
Use Scenario: A PLC I/O module powers up with multiple voltage rails (3.3 V, 5 V, 12 V); sequencing must ensure FPGA config completes before CPU boot. IC Role / Device Role / Timing Role: LM3724IM5-3.08/NOPB monitors the 3.3 V rail and holds reset until stable, enabling synchronized startup of ARM Cortex-M4 and FPGA fabric. Use Value: 190 ms timeout aligns with FPGA configuration time; open-drain output allows wired-OR with 5 V supervisor for full-rail coordination. |
Use Scenario: A handheld ECG monitor uses coin-cell battery and ultra-low-power MCU; supply dips during RF transmission trigger false resets. IC Role / Device Role / Timing Role: LM3724IM5-3.08/NOPB supervises the 3.3 V LDO output, asserting reset only when VCC falls below 3.08 V for >100 ms - ignoring brief RF-induced droops. Use Value: 6 µA quiescent current extends battery life; MR pin enables user-initiated recalibration without hardware modification. |
| Smart Energy Meter Firmware Recovery | Automotive Body Control Module (BCM) |
|
Use Scenario: An electricity meter experiences grid sags during lightning storms; firmware must recover cleanly without EEPROM corruption. IC Role / Device Role / Timing Role: LM3724IM5-3.08/NOPB detects brown-out on the 3.3 V microcontroller supply and forces hard reset before flash write operations commence. Use Value: Guaranteed RESET validity down to VCC = 1 V ensures reset signal integrity even during deep sags; industrial temp rating covers outdoor meter enclosures. |
Use Scenario: A BCM powers auxiliary functions (window lift, mirror fold) from a 3.3 V rail derived from vehicle battery; cold-cranking causes sub-3 V dips. IC Role / Device Role / Timing Role: LM3724IM5-3.08/NOPB monitors the 3.3 V domain and asserts reset during cranking, preventing erratic actuator commands. Use Value: 3.08 V threshold matches 3.3 V rail tolerance; MR pin connects to diagnostic port for service-mode forced reset without disassembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811TEUS+T | 3.08 V threshold, push-pull active-low output, same SOT-23-5 package, but higher 15 µA supply current | Lacks MR debounce and internal pull-up; requires external RC network for reliable manual reset | Choose when board space permits external MR conditioning and push-pull drive is preferred over open-drain flexibility |
| TPS3808G30DBVR | 3.0 V threshold (±0.5%), 200 ms timeout, 1.6 µA supply current, but requires external pull-up for open-drain mode | Higher accuracy and lower current, but no integrated MR pull-up - adds BOM line item and layout complexity | Prefer for ultra-low-power designs where 0.08 V threshold offset is acceptable and MR routing allows external resistor |
Compared with MAX811TEUS+T and TPS3808G30DBVR, LM3724IM5-3.08/NOPB uniquely combines factory-trimmed 3.08 V accuracy, integrated MR pull-up, and true open-drain output in a single SOT-23-5 footprint-reducing component count and simplifying reset bus design without sacrificing industrial temperature performance.
Availability
LM3724IM5-3.08/NOPB is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM3724IM5-3.08/NOPB 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 and embedded processing solutions, with over 50 years of innovation in power management, signal chain, and timing products.
The LM372x series was designed specifically for cost-sensitive, space-constrained microprocessor supervision in industrial and portable equipment-emphasizing precision threshold stability, low quiescent current, and robust MR handling without external components.
FAQ
What is the exact reset threshold voltage of LM3724IM5-3.08/NOPB and how tightly is it specified?
The LM3724IM5-3.08/NOPB has a factory-programmed reset threshold of 3.08 V, specified as 3.03 V (min) to 3.14 V (max) over the full industrial temperature range (−40°C to +85°C). This ±1.5% tolerance ensures reliable supervision of nominal 3.3 V supplies without external calibration, and is confirmed in the Electrical Characteristics table of the SNVS154E datasheet.
Does LM3724IM5-3.08/NOPB require an external pull-up resistor on the RESET pin, and what value is recommended?
Yes, LM3724IM5-3.08/NOPB features an active-low open-drain RESET output and requires an external pull-up resistor. A 100 kΩ resistor to the target logic rail (up to 5.5 V) is recommended per TI application guidance, ensuring leakage current does not cause excessive voltage drop while limiting sink current to <10 mA during assertion.
Can LM3724IM5-3.08/NOPB operate reliably during deep brown-out conditions below 2.0 V?
Yes, LM3724IM5-3.08/NOPB guarantees valid RESET output functionality down to VCC ≥1.0 V, as explicitly stated in the datasheet's Electrical Characteristics and Applications Information sections. This ensures deterministic reset behavior even during severe undervoltage events where many supervisors fail silently.
How does the Manual Reset (MR) pin of LM3724IM5-3.08/NOPB behave, and is an external pull-up needed?
The MR pin of LM3724IM5-3.08/NOPB includes an internal 22 kΩ pull-up to VCC, so no external resistor is required. It asserts reset when pulled below 0.25×VCC for ≥10 µs, and releases after MR rises above 0.7×VCC plus the 190 ms timeout - fully debounced per datasheet timing specifications.
What is the operating temperature range for LM3724IM5-3.08/NOPB, and is it qualified for industrial use?
LM3724IM5-3.08/NOPB is rated for −40°C to +85°C, designated as the "Industrial" grade in TI's packaging addendum. It is fully specified and tested across this range, with all key parameters-including reset threshold, timeout, and supply current-guaranteed per the SNVS154E datasheet, making it suitable for uncontrolled industrial environments.
LM3724IM5-3.08/NOPB 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:
- 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM3724IM5-3.08/NOPB FAQ
1.How can I place an order for LM3724IM5-3.08/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3724IM5-3.08/NOPB 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 LM3724IM5-3.08/NOPB reliable?
The price and inventory of LM3724IM5-3.08/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3724IM5-3.08/NOPB is usually 5 days.
3.What payment methods are accepted for LM3724IM5-3.08/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3724IM5-3.08/NOPB transactions.
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LM3724IM5-3.08/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3724IM5-3.08/NOPB 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 LM3724IM5-3.08/NOPB?
For technical support, including LM3724IM5-3.08/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3724IM5-3.08/NOPB requirements.
6.How does Aetrix verify that LM3724IM5-3.08/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3724IM5-3.08/NOPB 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 LM3724IM5-3.08/NOPB meets industry standards.
7.What is the process for return or replacement of LM3724IM5-3.08/NOPB?
All LM3724IM5-3.08/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3724IM5-3.08/NOPB, 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 LM3724IM5-3.08/NOPB part is unused and in its original packaging.
Return procedure for LM3724IM5-3.08/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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