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Texas Instruments LM3724EM5X-4.63/NOPB
- Part No.:
- LM3724EM5X-4.63/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3724EM5X-4.63/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,899
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Product details
Overview
LM3724EM5X-4.63/NOPB from Texas Instruments is an active-low open-drain microprocessor reset supervisor IC designed for precise 5V supply monitoring in embedded systems. It asserts reset when VCC falls below 4.63 V ±1.8%, guarantees RESET validity down to VCC ≥1 V, delivers a minimum 100 ms reset pulse (190 ms typical), and draws only 6 µA typical supply current. It is used in industrial controllers requiring reliable power-on initialization under extended temperature conditions.
For engineers reviewing the LM3724EM5X-4.63/NOPB datasheet, LM3724EM5X-4.63/NOPB pinout, LM3724EM5X-4.63/NOPB application, or LM3724EM5X-4.63/NOPB equivalent, key selection considerations include its open-drain output architecture, −40°C to +125°C extended temperature rating, 4.63 V reset threshold with 30 ppm/°C tempco, MR input debouncing, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LM3724EM5X-4.63/NOPB implements a precision bandgap reference (1.225 V) feeding dual comparators: one monitors VCC against the factory-trimmed 4.63 V threshold, the other validates manual reset (MR) transitions. Its internal one-shot timer ensures reset remains asserted for ≥100 ms after VCC rises above threshold, independent of supply ramp rate.
As an open-drain variant, the LM3724EM5X-4.63/NOPB requires an external pull-up resistor on the RESET pin-enabling level-shifting across logic families and wired-OR connection of multiple supervisors. Its MR input includes a 22 kΩ internal pull-up and rejects glitches <100 ns, supporting robust pushbutton interfacing without external RC filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V ±1.8% (guaranteed detection of 5 V supply brownout at 4.54–4.72 V) |
| Reset Timeout | 190 ms typical (ensures microprocessor completes power stabilization before release) |
| Supply Current | 6 µA typical at 25°C (enables multi-year battery life in portable equipment) |
| Operating Temp | −40°C to +125°C (supports under-hood automotive and industrial edge nodes) |
| VCC Range | 1.0 V to 5.5 V (RESET remains valid even during deep brownout recovery) |
| MR Input | 22 kΩ internal pull-up, VIH = 0.7×VCC, VIL = 0.25×VCC (direct TTL/CMOS compatibility) |
| Reset Output | Open-drain, VOL ≤0.4 V @ 3.2 mA (allows pull-up to any voltage ≤5.5 V, e.g., 3.3 V I/O domain) |
Pinout & Package
LM3724EM5X-4.63/NOPB is housed in a RoHS-compliant, green SOT-23-5 (DBV) package with 1.0 mm pitch, 2.9 mm × 1.6 mm footprint, and 1.1 mm height-optimized for high-density PCBs and reflow-compatible assembly.
| 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 for improved noise immunity and thermal dissipation |
| 3 | RESET | Active-low open-drain output; requires external pull-up resistor to define logic-high level |
| 4 | MR | Manual reset input; internally pulled up to VCC; asserting low initiates 190 ms reset pulse |
| 5 | VCC | Positive supply input; accepts 1.0–5.5 V; powers internal reference and comparators |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63 V threshold | Factory-trimmed to ±1.8% over −40°C to +125°C, enabling accurate 5 V rail supervision without external resistors |
| Open-drain RESET output | Allows direct connection to shared reset bus with other supervisors or mixed-voltage I/O domains via configurable pull-up |
| Guaranteed operation down to VCC = 1 V | Ensures deterministic reset behavior during deep brownout recovery, critical for non-volatile memory write integrity |
| MR input with 22 kΩ pull-up | Eliminates need for external pull-up resistor; supports momentary switch interface with no additional components |
| 100 ns MR glitch immunity | Rejects contact bounce and EMI-induced transients on manual reset line, preventing spurious system resets |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers operating in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Monitors 5 V system rail and asserts open-drain RESET to halt CPU execution until stable power is confirmed; MR pin enables field-service reset via front-panel button. Use Value: Prevents corrupted firmware execution during voltage sags caused by motor switching noise, leveraging 30 ppm/°C tempco and −40°C to +125°C operation. |
Use Scenario: Supervising microcontroller power in body electronics modules exposed to under-hood thermal stress and load-dump transients. IC Role / Device Role / Timing Role: Detects 5 V supply collapse during alternator regulation faults and holds RESET active for 190 ms to ensure safe EEPROM save before shutdown. Use Value: Open-drain output interfaces directly to 3.3 V microcontroller reset pin using 3.3 V pull-up, avoiding level translators while maintaining timing accuracy. |
| Portable Medical Monitor | Smart Energy Meter |
Use Scenario: Battery-powered patient vital sign monitor requiring ultra-low quiescent current and guaranteed reset during Li-ion cell discharge down to 3.0 V. IC Role / Device Role / Timing Role: Resets ARM Cortex-M0+ MCU when 5 V LDO output drops below 4.63 V due to battery sag; operates continuously at 6 µA to extend runtime. Use Value: Valid RESET assertion down to VCC = 1 V ensures deterministic state recovery even during abrupt power loss, preserving last-measurement data. |
Use Scenario: Tamper-resistant electricity meter with isolated communication and secure boot sequence dependent on clean power-up. IC Role / Device Role / Timing Role: Provides power-on reset and manual reset via sealed enclosure switch; open-drain output connects to isolated reset isolator input. Use Value: 22 kΩ internal MR pull-up eliminates BOM cost and layout area for external resistor, improving long-term reliability in humid environments. |
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 | 4.63 V threshold, push-pull active-low RESET, 140 ms timeout, −40°C to +85°C rating | Lacks open-drain flexibility; requires dedicated reset rail; unsuitable for wired-OR or level-shifted reset busses | Select when board-level reset is isolated and no multi-supervisor coordination is needed |
| TPS3808G33DBVR | 3.3 V threshold (not 4.63 V), adjustable delay, 1.8–6 V VCC range, −40°C to +125°C | Requires external resistor divider for 5 V monitoring; higher 12 µA ICC; lacks integrated MR pull-up | Select when design requires programmable reset delay or dual-voltage monitoring capability |
Compared with MAX811TEUS+T, LM3724EM5X-4.63/NOPB provides open-drain flexibility for system-level reset arbitration; compared with TPS3808G33DBVR, it delivers exact 4.63 V threshold without calibration overhead and integrates MR pull-up to reduce component count.
Availability
LM3724EM5X-4.63/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM3724EM5X-4.63/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 core expertise in power management, signal chain, and microcontrollers.
The LM372x family was engineered specifically for high-reliability microprocessor supervision in harsh environments-emphasizing precision threshold accuracy, extended temperature operation, and minimal external component count.
FAQ
What is the reset threshold voltage of the LM3724EM5X-4.63/NOPB?
The LM3724EM5X-4.63/NOPB has a factory-programmed reset threshold of 4.63 V, specified over temperature as 4.54 V (min) to 4.72 V (max) across −40°C to +125°C. This value is trimmed during production and does not require external adjustment, making it ideal for monitoring nominal 5 V supplies where brownout detection must occur within tight tolerances.
Why does the LM3724EM5X-4.63/NOPB use an open-drain RESET output?
The LM3724EM5X-4.63/NOPB uses an open-drain RESET output to enable wired-OR configuration with other reset sources, support level-shifting across different logic domains (e.g., pulling RESET to 3.3 V while VCC is 5 V), and simplify integration into systems with bidirectional or shared reset buses-without requiring additional logic gates or translators.
Can the LM3724EM5X-4.63/NOPB operate with VCC below 2.5 V?
Yes, the LM3724EM5X-4.63/NOPB is fully functional with VCC as low as 1.0 V. Its RESET output remains valid (capable of sinking ≥50 µA with VOL ≤0.3 V) down to this level, ensuring reliable reset assertion during deep brownout conditions-critical for preserving data in non-volatile memory during power failure.
How is the manual reset (MR) pin configured on the LM3724EM5X-4.63/NOPB?
The MR pin on the LM3724EM5X-4.63/NOPB features an internal 22 kΩ pull-up resistor to VCC, eliminating the need for an external component. A logic-low pulse >10 µs on MR initiates a full 190 ms reset cycle. Glitches shorter than 100 ns are rejected, providing inherent immunity to switch bounce and EMI.
What package type and environmental compliance does the LM3724EM5X-4.63/NOPB have?
The LM3724EM5X-4.63/NOPB is supplied in a SOT-23-5 (DBV) package with 100 % matte tin (Cu Sn) lead finish, compliant with RoHS and halogen-free (Green) requirements. It meets JEDEC Level-1 moisture sensitivity and is rated for reflow soldering up to 260°C peak temperature.
LM3724EM5X-4.63/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM3724EM5X-4.63/NOPB FAQ
1.How can I place an order for LM3724EM5X-4.63/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3724EM5X-4.63/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 LM3724EM5X-4.63/NOPB reliable?
The price and inventory of LM3724EM5X-4.63/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3724EM5X-4.63/NOPB is usually 5 days.
3.What payment methods are accepted for LM3724EM5X-4.63/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3724EM5X-4.63/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3724EM5X-4.63/NOPB?
LM3724EM5X-4.63/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3724EM5X-4.63/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 LM3724EM5X-4.63/NOPB?
For technical support, including LM3724EM5X-4.63/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3724EM5X-4.63/NOPB requirements.
6.How does Aetrix verify that LM3724EM5X-4.63/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3724EM5X-4.63/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 LM3724EM5X-4.63/NOPB meets industry standards.
7.What is the process for return or replacement of LM3724EM5X-4.63/NOPB?
All LM3724EM5X-4.63/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3724EM5X-4.63/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 LM3724EM5X-4.63/NOPB part is unused and in its original packaging.
Return procedure for LM3724EM5X-4.63/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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