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Texas Instruments LM3724IM5-4.63/NOPB
- Part No.:
- LM3724IM5-4.63/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3724IM5-4.63/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,217
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Product details
Overview
LM3724IM5-4.63/NOPB from Texas Instruments is a precision 5-pin microprocessor reset supervisor IC with active-low open-drain RESET output, factory-trimmed 4.63 V reset threshold (±1.5% over temperature), 190 ms typical reset timeout, and guaranteed operation down to VCC ≥1 V. It monitors 5 V supply rails in embedded controllers and industrial microprocessor systems requiring reliable power-on/brown-out reset assertion.
For engineers reviewing the LM3724IM5-4.63/NOPB datasheet, LM3724IM5-4.63/NOPB pinout, LM3724IM5-4.63/NOPB application, or LM3724IM5-4.63/NOPB equivalent, key selection criteria include open-drain output compatibility with mixed-voltage systems, −40°C to +85°C industrial temperature range, 6 µA typical supply current, and MR input debouncing with 22 kΩ internal pull-up.
Technical Context
The LM3724IM5-4.63/NOPB integrates a precision voltage reference (1.225 V), dual comparators (reset threshold and manual reset), and a one-shot timer to generate a minimum 100 ms (190 ms typical) active-low reset pulse after VCC rises above 4.63 V or MR deasserts. Its open-drain RESET output enables wired-OR configuration with other supervisors and logic-level translation via external pull-up to voltages up to 5.5 V.
It features glitch immunity on both VCC (≥100 ns rejection of transients) and MR inputs, operates with full functionality across VCC = 1.0–5.5 V, and maintains valid RESET output state even during deep brownouts-critical for deterministic initialization in battery-backed or low-power microcontroller applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V ±1.5% over −40°C to +85°C - precisely targets 5 V nominal supplies with 5.4%–9.2% undervoltage margin before reset assertion. |
| Reset Timeout | 190 ms typical - ensures sufficient hold time for microprocessor core, PLL, and memory initialization before release. |
| Supply Current | 6 µA typical at 25°C - enables use in always-on, battery-powered systems without compromising runtime. |
| Operating Voltage Range | 1.0 V to 5.5 V - guarantees functional RESET output validity even during severe brownout conditions down to 1 V. |
| MR Input Logic | VIL = 0.25×VCC, VIH = 0.7×VCC - compatible with standard CMOS logic families and supports direct pushbutton or FPGA GPIO connection. |
| Output Type | Active-low open-drain - allows level-shifting, multi-supervisor OR-ing, and interface to 1.8 V/3.3 V/5 V logic domains using external pull-up. |
| Temperature Range | −40°C to +85°C (Industrial) - validated for deployment in industrial control panels, motor drives, and outdoor telemetry equipment. |
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) lead 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 for stable threshold accuracy and noise immunity. |
| 2 | GND | Second ground terminal - electrically connected internally to Pin 1; improves thermal dissipation and reduces ground bounce in high-noise environments. |
| 3 | RESET | Active-low open-drain output - requires external pull-up resistor (typically 10–100 kΩ) to target logic rail; sinks ≤3.2 mA at VCC = 4.63 V min. |
| 4 | MR | Manual reset input - internally pulled up to VCC via 22 kΩ; asserted low <0.25×VCC for >10 µs to trigger 190 ms reset pulse. |
| 5 | VCC | Power supply input - accepts 1.0–5.5 V; powers internal reference, comparators, and timer; regulates independently of output load. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.63 V with ±1.5% tolerance over full temperature range - eliminates need for external resistor divider calibration in 5 V systems. |
| Open-drain RESET output | Supports wired-OR of multiple supervisors and level translation to any logic rail ≤5.5 V - simplifies system-level reset arbitration. |
| Guaranteed operation down to VCC = 1 V | RESET remains valid and controllable even during deep brownout - prevents undefined microprocessor state during partial power loss. |
| Internal MR pull-up | 22 kΩ resistor eliminates external component for basic pushbutton reset - reduces BOM count and PCB area in space-constrained designs. |
| Transient-immune monitoring | Rejects VCC glitches ≤100 ns and tolerates 125 mV undershoot for ≤40 µs - avoids spurious resets in electrically noisy industrial environments. |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
Use Scenario: Power cycling during grid voltage sags or communication module firmware updates. IC Role / Device Role / Timing Role: Monitors 5 V system rail and asserts open-drain RESET to ARM Cortex-M4 MCU and isolated RS-485 transceiver. Use Value: 190 ms timeout ensures complete flash reprogramming and peripheral reinitialization; open-drain output interfaces cleanly to 3.3 V MCU reset pin via 10 kΩ pull-up. |
Use Scenario: Battery backup switchover and tamper-detection event logging during mains failure. IC Role / Device Role / Timing Role: Supervises 5 V DC-DC output powering metrology SoC and real-time clock; MR triggered by tamper switch. Use Value: 6 µA quiescent current extends lithium-thionyl chloride battery life beyond 10 years; VCC ≥1 V validity prevents RTC corruption during 0.8 V brownout. |
| Medical Infusion Pump | Automotive Body Control Module |
Use Scenario: Cold-start power ramp-up and ESD-induced supply disturbance during hospital environment operation. IC Role / Device Role / Timing Role: Primary reset supervisor for safety-critical PIC microcontroller; RESET output wired-OR'd with watchdog timer output. Use Value: Dual GND pins reduce ground impedance and improve noise margin; 4.63 V threshold provides 7.4% headroom below 5 V nominal rail per IEC 60601-1. |
Use Scenario: Ignition-on sequencing and CAN transceiver power stabilization in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Resets 32-bit RISC MCU and LIN transceiver after DC-DC converter stabilizes; MR linked to service mode button. Use Value: −40°C to +85°C rating meets AEC-Q100 Grade 3 requirements; MR debounce eliminates contact bounce false triggers during field servicing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811TEUS+T | 4.63 V threshold, push-pull active-low RESET, no MR input, 140 ms timeout, 10 µA ICC. | Lacks manual reset capability and open-drain flexibility; requires PCB redesign for wired-OR or level translation. | Select when MR is unnecessary and board layout prohibits adding external pull-up; verify timing compatibility with MCU reset hold requirement. |
| TPS3808G33DBVR | 3.3 V threshold (not 4.63 V), adjustable timeout (200 ms default), 1.6 µA ICC, MR input, open-drain RESET. | Incorrect threshold for 5 V monitoring; requires external resistor network to shift threshold - adds cost and calibration risk. | Choose only if redesigning for 3.3 V core supply; otherwise unsuitable due to mismatched reset voltage specification. |
Compared with MAX811TEUS+T and TPS3808G33DBVR, the LM3724IM5-4.63/NOPB uniquely combines factory-set 4.63 V accuracy, open-drain output, integrated MR pull-up, and industrial temperature grade in a single SOT-23-5 package-enabling drop-in replacement in legacy 5 V microcontroller designs without layout or firmware changes.
Availability
LM3724IM5-4.63/NOPB is available at Aetrix Electronics and suitable for industrial automation, smart metering, medical instrumentation, and automotive body electronics requiring stable component supply across extended lifecycle programs.
Supply support for LM3724IM5-4.63/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 over 50 years of innovation in power management, signal chain, and microcontroller technologies.
The LM372x series was designed specifically for cost-sensitive, space-constrained microprocessor supervisory applications demanding precision voltage monitoring, low quiescent current, and robust manual reset functionality in industrial and portable equipment.
FAQ
What is the exact reset threshold voltage of the LM3724IM5-4.63/NOPB and how tightly is it specified?
The LM3724IM5-4.63/NOPB has a factory-programmed reset threshold of 4.63 V, with a guaranteed tolerance of ±1.5% over the full industrial temperature range (−40°C to +85°C). This corresponds to a min/max range of 4.56 V to 4.70 V at 25°C and 4.50 V to 4.75 V across temperature - ensuring reliable detection of 5 V supply brownout while maintaining adequate noise margin.
Does the LM3724IM5-4.63/NOPB require an external pull-up resistor on the RESET pin, and what value is recommended?
Yes, the LM3724IM5-4.63/NOPB features an active-low open-drain RESET output and requires an external pull-up resistor. A value between 10 kΩ and 100 kΩ is recommended, selected based on target logic voltage (e.g., 10 kΩ for 3.3 V, 47 kΩ for 5 V) and maximum sink current (≤3.2 mA at VCC = 4.63 V min). TI's datasheet Figure 2 shows a typical 10 kΩ pull-up to VCC.
Can the LM3724IM5-4.63/NOPB operate reliably when the supply voltage drops below 2 V?
Yes - the LM3724IM5-4.63/NOPB guarantees valid RESET output behavior down to VCC ≥1 V. Its internal reference and comparator circuitry remain functional, and the RESET output retains defined logic states (low when asserted, high-impedance when released) even during deep brownout events. This ensures deterministic microprocessor initialization in low-voltage fault conditions.
How does the manual reset (MR) input behave, and is an external pull-up required?
No external pull-up is required: the LM3724IM5-4.63/NOPB integrates a 22 kΩ internal pull-up on the MR pin. MR is asserted when pulled below 0.25×VCC for >10 µs, triggering a full 190 ms reset pulse. The internal pull-up enables direct connection to momentary switches (to GND) or open-collector logic outputs without additional components.
Is the LM3724IM5-4.63/NOPB pin-compatible with other members of the LM372x family, such as the LM3722 or LM3723?
Yes - all LM372x variants (LM3722, LM3723, LM3724) share identical SOT-23-5 pinout and footprint. The LM3724IM5-4.63/NOPB uses Pins 1–5 as GND/GND/RESET/MR/VCC, matching LM3722 and LM3723. However, output type differs: LM3722 is active-low push-pull, LM3723 is active-high push-pull, and LM3724 is active-low open-drain - requiring schematic review before substitution.
LM3724IM5-4.63/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:
- 4.63V
- 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
LM3724IM5-4.63/NOPB FAQ
1.How can I place an order for LM3724IM5-4.63/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3724IM5-4.63/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 LM3724IM5-4.63/NOPB reliable?
The price and inventory of LM3724IM5-4.63/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3724IM5-4.63/NOPB is usually 5 days.
3.What payment methods are accepted for LM3724IM5-4.63/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3724IM5-4.63/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3724IM5-4.63/NOPB?
LM3724IM5-4.63/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3724IM5-4.63/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 LM3724IM5-4.63/NOPB?
For technical support, including LM3724IM5-4.63/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3724IM5-4.63/NOPB requirements.
6.How does Aetrix verify that LM3724IM5-4.63/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3724IM5-4.63/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 LM3724IM5-4.63/NOPB meets industry standards.
7.What is the process for return or replacement of LM3724IM5-4.63/NOPB?
All LM3724IM5-4.63/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3724IM5-4.63/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 LM3724IM5-4.63/NOPB part is unused and in its original packaging.
Return procedure for LM3724IM5-4.63/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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