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Texas Instruments LM3722EM5-2.32/NOPB
- Part No.:
- LM3722EM5-2.32/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3722EM5-2.32/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,187
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Product details
Overview
LM3722EM5-2.32/NOPB from Texas Instruments is a precision 5-pin SOT-23 microprocessor reset supervisor IC with active-low push-pull RESET output, factory-trimmed 2.32 V reset threshold (±25 mV), 190 ms typical reset timeout, guaranteed operation down to VCC ≥ 1 V, and 6 µA typical supply current. It monitors 2.5 V supply rails in battery-powered embedded systems requiring reliable power-on, brown-out, and manual reset functionality.
For engineers reviewing the LM3722EM5-2.32/NOPB datasheet, LM3722EM5-2.32/NOPB pinout, LM3722EM5-2.32/NOPB application, or LM3722EM5-2.32/NOPB equivalent, key selection considerations include its industrial temperature range (−40°C to +85°C), open-drain compatibility via external pull-up, MR input debouncing, transient immunity up to 125 mV overdrive, and direct drop-in suitability for MAX811/812-replaced designs.
Technical Context
The LM3722EM5-2.32/NOPB integrates a precision bandgap reference (1.225 V), low-offset comparator, one-shot timer, and push-pull output driver in a single SOT-23-5 package. Its reset assertion logic triggers when VCC falls below 2.32 V and holds RESET low for ≥100 ms after VCC recovers above threshold - with 190 ms typical timeout.
It features a fully debounced manual reset (MR) input with internal 22 kΩ pull-up, glitch immunity <100 ns, and propagation delay of 2 µs. The device operates across VCC = 1.0–5.5 V and maintains valid RESET output down to VCC = 1 V, enabling robust supervision even during deep brown-out conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32 V ±25 mV - precisely matches 2.5 V nominal supply with 90.8–94.8% tolerance window for deterministic reset timing. |
| Reset Timeout | 190 ms typical - ensures sufficient microprocessor initialization time before release; guaranteed ≥100 ms across temperature. |
| Supply Current | 6 µA typical at VCC = 2.5 V - enables multi-year battery life in portable instrumentation and IoT edge nodes. |
| VCC Operating Range | 1.0 V to 5.5 V - supports valid RESET assertion and release down to 1 V, critical for ultra-low-voltage brown-out detection. |
| MR Input Logic | VIH = 0.25×VCC, VIL = 0.7×VCC - compatible with CMOS/TTL logic families and allows daisy-chained reset coordination. |
| Output Type | Active-low push-pull - drives standard CMOS inputs directly without external pull-up; sinks 1.2 mA min at VCC = 2.5 V. |
| Temperature Range | −40°C to +85°C (Industrial) - qualified for use in automotive body electronics, industrial controllers, and medical handhelds. |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.1 mm, surface-mount, lead-free (RoHS & no Sb/Br), moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference and substrate connection - must be connected to system ground plane for stable reset threshold and noise immunity. |
| 2 | VCC | Power supply input - accepts 1.0–5.5 V; powers internal reference, comparators, and output stage; bypass capacitor required. |
| 3 | RESET | Active-low push-pull output - asserts low during power-up/brown-out/manual reset; releases high after timeout; drives CMOS directly. |
| 4 | MR | Manual reset input - internally pulled up to VCC via 22 kΩ; asserted when pulled ≤0.25×VCC; debounced and glitch-filtered. |
| 5 | GND | Second ground terminal - electrically tied to Pin 1 internally; improves thermal dissipation and reduces ground bounce in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.32 V threshold | Factory-trimmed ±25 mV accuracy ensures consistent reset point across 2.5 V rail monitoring without external calibration. |
| 190 ms reset timeout | Guaranteed minimum 100 ms hold time prevents premature microprocessor release during slow-rising VCC transients. |
| 6 µA supply current | Enables integration into always-on subsystems (e.g., RTC supervisors, wake-on-event circuits) without measurable battery drain. |
| VCC ≥ 1 V RESET validity | Ensures deterministic reset state even during deep undervoltage events where many competitors fail or float. |
| MR input with 22 kΩ pull-up | Eliminates need for external pull-up resistor; simplifies PCB layout and reduces BOM count in space-constrained applications. |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG and pulse oximeter units operating on single-cell Li-ion (2.7–4.2 V) or coin-cell supplies. IC Role / Device Role / Timing Role: Supervises 2.5 V LDO output powering MCU and analog front-end; asserts RESET during battery sag or cold-start. Use Value: Prevents corrupted sensor readings or firmware lockup by guaranteeing clean reset before ADC/MCU initialization. |
Use Scenario: DIN-rail mounted programmable logic controller modules with isolated 2.5 V digital logic rails. IC Role / Device Role / Timing Role: Monitors 2.5 V supply feeding FPGA configuration memory and communication peripherals; provides brown-out protection during AC line dips. Use Value: Eliminates spurious I/O toggling or Modbus CRC errors caused by marginal voltage on digital interfaces. |
| Smart Energy Meters | Automotive Body Control Units |
Use Scenario: ANSI C12.20-compliant electricity meters with dual-supply architecture (3.3 V MCU, 2.5 V metrology ASIC). IC Role / Device Role / Timing Role: Resets metrology ASIC independently during 2.5 V rail instability, decoupled from main MCU reset timing. Use Value: Maintains metering accuracy continuity by isolating metrology domain resets from host processor faults. |
Use Scenario: Door module ECUs powered from vehicle battery (9–16 V) with local 2.5 V LDO for LIN transceiver and sensor interface. IC Role / Device Role / Timing Role: Detects 2.5 V rail collapse during load-dump or cranking; initiates controlled shutdown sequence via MR-linked watchdog. Use Value: Avoids LIN bus arbitration loss or EEPROM write corruption during engine start transients. |
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 | 2.32 V threshold, SOT-23-5, active-low push-pull, but rated only to +85°C and lacks MR input debouncing circuitry. | Requires external RC filter on MR; not suitable for extended-temp industrial deployments where MR reliability is critical. | Select LM3722EM5-2.32/NOPB when MR-driven reset coordination, guaranteed 190 ms timeout, or −40°C operation is required. |
| TPS3808G125DBVR | 2.32 V threshold, SOT-23-6, active-low open-drain, 200 ms timeout, 1.8–6 V VCC range, but requires external pull-up and has larger footprint. | Open-drain output enables wired-OR reset buses; however, adds BOM cost and layout complexity versus push-pull simplicity. | Choose LM3722EM5-2.32/NOPB for lowest component count, minimal board area, and direct drive of CMOS inputs without pull-up. |
Compared with MAX811TEUS+T and TPS3808G125DBVR, the LM3722EM5-2.32/NOPB delivers superior MR robustness, tighter threshold tolerance, and identical package size while eliminating external components - making it optimal for cost-sensitive, space-constrained 2.5 V system supervision.
Availability
LM3722EM5-2.32/NOPB is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LM3722EM5-2.32/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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision analog IC design and high-volume manufacturing.
The LM3722 series belongs to TI's microprocessor supervisory IC product line, engineered specifically for deterministic power-on reset, brown-out recovery, and manual reset coordination in resource-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the LM3722EM5-2.32/NOPB?
The LM3722EM5-2.32/NOPB has a factory-trimmed reset threshold of 2.32 V with a tolerance of ±25 mV across the full industrial temperature range (−40°C to +85°C). This value is specified in the Electrical Characteristics table of the SNVS154E datasheet and applies directly to the LM3722EM5-2.32/NOPB variant, ensuring precise supervision of 2.5 V supply rails without external calibration.
Does the LM3722EM5-2.32/NOPB support manual reset functionality?
Yes, the LM3722EM5-2.32/NOPB includes a dedicated MR (Manual Reset) input (Pin 4) with internal 22 kΩ pull-up to VCC. Pulling MR below 0.25×VCC for >10 µs asserts RESET, and the device holds RESET low for the full 190 ms timeout after MR returns high. This eliminates external pull-up resistors and provides hardware-level reset initiation independent of software control.
Can the LM3722EM5-2.32/NOPB operate reliably below 2.5 V supply?
Yes, the LM3722EM5-2.32/NOPB guarantees valid RESET output operation down to VCC = 1.0 V, as confirmed in the Electrical Characteristics table. Its internal reference and comparator remain functional across 1.0–5.5 V, enabling reliable brown-out detection even during deep discharge of lithium-based batteries or unstable LDO outputs.
What is the package type and footprint of the LM3722EM5-2.32/NOPB?
The LM3722EM5-2.32/NOPB uses the SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.1 mm, with 0.95 mm pin pitch. It is RoHS-compliant, green (Pb-free, no Sb/Br), and rated for moisture sensitivity level 1 (MSL-1, 260°C peak reflow). Pinout matches industry-standard 5-pin SOT-23 supervisors including MAX811 variants.
How does the LM3722EM5-2.32/NOPB handle power supply transients?
The LM3722EM5-2.32/NOPB provides built-in immunity to short negative-going VCC transients: a 125 mV dip below threshold lasting ≤40 µs will not trigger false reset. This is achieved via comparator hysteresis and internal filtering. Adding a 0.1 µF ceramic capacitor close to the VCC pin further enhances transient rejection per Figure 14 in the SNVS154E datasheet.
LM3722EM5-2.32/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:
- Push-Pull, Totem Pole
- 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
LM3722EM5-2.32/NOPB FAQ
1.How can I place an order for LM3722EM5-2.32/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3722EM5-2.32/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 LM3722EM5-2.32/NOPB reliable?
The price and inventory of LM3722EM5-2.32/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3722EM5-2.32/NOPB is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3722EM5-2.32/NOPB transactions.
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LM3722EM5-2.32/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3722EM5-2.32/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 LM3722EM5-2.32/NOPB?
For technical support, including LM3722EM5-2.32/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3722EM5-2.32/NOPB requirements.
6.How does Aetrix verify that LM3722EM5-2.32/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3722EM5-2.32/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 LM3722EM5-2.32/NOPB meets industry standards.
7.What is the process for return or replacement of LM3722EM5-2.32/NOPB?
All LM3722EM5-2.32/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3722EM5-2.32/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 LM3722EM5-2.32/NOPB part is unused and in its original packaging.
Return procedure for LM3722EM5-2.32/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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