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Texas Instruments LM3724EM5-2.32/NOPB
- Part No.:
- LM3724EM5-2.32/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3724EM5-2.32/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,063
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Product details
Overview
LM3724EM5-2.32/NOPB from Texas Instruments is an active-low open-drain microprocessor reset supervisor IC designed for 2.5V supply monitoring in embedded systems. It asserts reset when VCC falls below 2.32V ±10mV, guarantees valid output down to VCC ≥1V, provides 190ms typical reset timeout, and draws only 6µA typical supply current at 2.5V. It is used in battery-powered controllers to prevent erratic microprocessor operation during brownout.
For engineers reviewing the LM3724EM5-2.32/NOPB datasheet, LM3724EM5-2.32/NOPB pinout, LM3724EM5-2.32/NOPB application, or LM3724EM5-2.32/NOPB equivalent, key selection criteria include its 2.32V reset threshold accuracy, open-drain output compatibility with mixed-voltage logic, guaranteed operation down to 1V supply, −40°C to +125°C extended temperature range, and SOT-23-5 package footprint.
Technical Context
The LM3724EM5-2.32/NOPB integrates a precision voltage reference (1.225V), low-line comparator, manual reset comparator, and one-shot timer in a single die. Its reset assertion logic is triggered solely by VCC crossing the factory-trimmed 2.32V threshold or MR pin activation, with no internal watchdog or windowed monitoring.
It features built-in glitch immunity on both VCC (≥100ns rejection) and MR (≥100ns rejection), a 22kΩ internal MR pull-up resistor, and open-drain RESET output capable of sinking ≥1.2mA at VCC = 2.5V while maintaining VOL ≤0.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V ±10mV - precisely monitors 2.5V nominal supplies within 90.8–94.8% tolerance band |
| Reset Timeout | 190ms typical - ensures sufficient processor initialization time after power recovery |
| Supply Current | 6µA typical at VCC = 2.5V - enables multi-year battery life in portable instrumentation |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| VCC Range | 1.0V to 5.5V - RESET remains functional even during deep brownout conditions |
| MR Input | Internal 22kΩ pull-up - eliminates external biasing components for pushbutton reset interface |
| Output Type | Active-low open-drain - allows wired-OR of multiple supervisors and level-shifting to 5.5V logic |
Pinout & Package
LM3724EM5-2.32/NOPB uses the industry-standard SOT-23-5 (DBV) package, measuring 2.9mm × 1.6mm × 1.15mm with gull-wing leads and RoHS-compliant Cu-Sn finish (Level-1 MSL).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference and substrate connection - must be tied directly to system ground plane |
| 2 | MR | Manual reset input - active-low, internally pulled up to VCC; debounced for >100ns glitches |
| 3 | RESET | Active-low open-drain output - requires external pull-up; sinks ≥1.2mA at VCC = 2.5V |
| 4 | GND | Second ground terminal - improves noise immunity and thermal dissipation in high-density layouts |
| 5 | VCC | Supply input - accepts 1.0V–5.5V; powers internal comparators and timer circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.32V threshold | ±10mV tolerance over −40°C to +125°C ensures reliable 2.5V supply monitoring without derating |
| Open-drain RESET output | Enables direct connection to 1.8V/3.3V/5V logic rails via external pull-up, supporting mixed-voltage system resets |
| 190ms reset timeout | Guarantees microcontroller core and peripherals fully stabilize before release, eliminating boot failures |
| 6µA supply current | Reduces quiescent power in always-on subsystems - critical for energy harvesting and coin-cell applications |
| VCC ≥1V reset validity | Maintains deterministic reset state during ultra-low-power wake-up sequences and partial brownouts |
Applications
| Industrial PLC I/O Module | Battery-Powered Data Logger |
|---|---|
Use Scenario: Remote sensor node powered by Li-SOCl₂ battery operating in −40°C to +85°C outdoor enclosures with intermittent 2.5V rail instability. IC Role / Device Role / Timing Role: Monitors 2.5V LDO output and asserts open-drain RESET to MSP430F5xx MCU upon voltage sag, holding reset for 190ms after recovery. Use Value: Prevents flash corruption and register lockup during cold-start brownout, extending field deployment lifetime beyond 10 years. | Use Scenario: Portable environmental monitor using AA batteries and low-quiescent DC/DC converter generating 2.5V for ADC and microcontroller. IC Role / Device Role / Timing Role: Provides power-on reset and brownout detection on 2.5V rail; MR pin connected to tactile switch for user-initiated calibration reset. Use Value: 6µA supply current minimizes standby drain, enabling >2-year battery life; open-drain output interfaces cleanly with 3.3V-level MCU reset pin. |
| Automotive Body Control Unit | Medical Point-of-Care Analyzer |
Use Scenario: Under-dash module exposed to engine bay transients, powered from 5V buck regulator feeding 2.5V analog front-end and MCU core. IC Role / Device Role / Timing Role: Supervises 2.5V domain; rejects <100ns VCC glitches per JEDEC specs; RESET output drives optocoupler-isolated reset line. Use Value: −40°C to +125°C rating and 2.32V threshold match automotive 2.5V rail tolerances; eliminates false resets from load-dump noise. | Use Scenario: Handheld diagnostic device with dual-supply architecture: 3.3V for digital logic and 2.5V for precision ADC reference and op-amps. IC Role / Device Role / Timing Role: Resets ARM Cortex-M0+ processor only when 2.5V reference rail drops below 2.32V, decoupling digital and analog domain faults. Use Value: Prevents erroneous measurements due to analog rail collapse while allowing digital subsystem to remain operational during transient dips. |
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 | 2.32V threshold, push-pull active-low RESET, 140ms min timeout, −40°C to +85°C | Lacks open-drain output; incompatible with wired-OR or level-shifted reset buses | Select only if board layout prohibits external pull-up and system uses single supervisor |
| TPS3808G125DBVR | 2.32V threshold, open-drain active-low RESET, 200ms min timeout, −40°C to +125°C, 1.6µA IQ | Lower quiescent current but requires external MR pull-up; no internal MR bias | Prefer for ultra-low-power designs where MR is unused or externally biased |
Compared with MAX811TEUS+T, LM3724EM5-2.32/NOPB offers open-drain flexibility and extended temperature range; compared with TPS3808G125DBVR, it reduces BOM count via integrated MR pull-up while maintaining identical threshold and temperature performance.
Availability
LM3724EM5-2.32/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, portable medical devices, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LM3724EM5-2.32/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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The LM3724EM5-2.32/NOPB belongs to TI's microprocessor supervisory circuit family, engineered specifically for precision voltage monitoring and deterministic reset generation in resource-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the LM3724EM5-2.32/NOPB?
The LM3724EM5-2.32/NOPB has a factory-trimmed reset threshold of 2.32V with a tolerance of ±10mV over the full −40°C to +125°C operating range. This value is specified in the Electrical Characteristics table of the SNVS154E datasheet and applies directly to the LM3724EM5-2.32/NOPB variant. The threshold is optimized for reliable supervision of 2.5V nominal power rails.
Does the LM3724EM5-2.32/NOPB require an external pull-up resistor on its RESET pin?
Yes, the LM3724EM5-2.32/NOPB features an active-low open-drain RESET output and requires an external pull-up resistor to the target logic rail (e.g., 1.8V, 3.3V, or 5V). A 100kΩ resistor is recommended per TI application guidance to ensure proper logic levels while limiting sink current to <10mA during reset assertion. No pull-up is integrated internally.
Can the LM3724EM5-2.32/NOPB operate reliably below 2.5V supply voltage?
Yes, the LM3724EM5-2.32/NOPB is fully functional down to VCC = 1.0V. Its RESET output remains valid and capable of sinking current even at 1V, enabling use in ultra-low-voltage wake-up circuits and brownout recovery scenarios where other supervisors fail. This behavior is guaranteed in the Absolute Maximum Ratings and Electrical Characteristics sections of the datasheet.
What is the purpose of the dual GND pins on the LM3724EM5-2.32/NOPB?
The LM3724EM5-2.32/NOPB uses two dedicated GND pins (Pin 1 and Pin 4) to provide separate low-impedance return paths for analog reference circuitry and digital reset logic. This separation improves noise immunity, reduces ground bounce during RESET transitions, and enhances thermal dissipation in high-reliability applications-confirmed in the SOT-23-5 connection diagram and pin descriptions of SNVS154E.
How does the manual reset (MR) function work on the LM3724EM5-2.32/NOPB?
The MR pin on the LM3724EM5-2.32/NOPB is an active-low, internally pulled-up (22kΩ) input. Pulling MR below 0.25×VCC for >10µs initiates a reset pulse lasting 190ms after MR returns high. Glitches <100ns are rejected. This allows direct connection to pushbuttons without external debounce components, as documented in the "MANUAL RESET INPUT (MR)" section of SNVS154E.
LM3724EM5-2.32/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:
- 2.32V
- 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
LM3724EM5-2.32/NOPB FAQ
1.How can I place an order for LM3724EM5-2.32/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3724EM5-2.32/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 LM3724EM5-2.32/NOPB reliable?
The price and inventory of LM3724EM5-2.32/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3724EM5-2.32/NOPB is usually 5 days.
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5.How can I obtain technical support or documentation for LM3724EM5-2.32/NOPB?
For technical support, including LM3724EM5-2.32/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3724EM5-2.32/NOPB requirements.
6.How does Aetrix verify that LM3724EM5-2.32/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3724EM5-2.32/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 LM3724EM5-2.32/NOPB meets industry standards.
7.What is the process for return or replacement of LM3724EM5-2.32/NOPB?
All LM3724EM5-2.32/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3724EM5-2.32/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 LM3724EM5-2.32/NOPB part is unused and in its original packaging.
Return procedure for LM3724EM5-2.32/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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