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Texas Instruments LM3722EM5-3.08/NOPB
- Part No.:
- LM3722EM5-3.08/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3722EM5-3.08/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,411
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Product details
Overview
LM3722EM5-3.08/NOPB from Texas Instruments is a precision 3.08 V active-low microprocessor reset supervisor IC in SOT-23-5 package, monitoring 3.3 V supply rails with ±1.5% threshold accuracy, 190 ms reset timeout, and guaranteed RESET validity down to VCC ≥ 1 V. It provides power-on, brown-out, and manual reset for embedded controllers in industrial instrumentation.
For engineers reviewing the LM3722EM5-3.08/NOPB datasheet, LM3722EM5-3.08/NOPB pinout, LM3722EM5-3.08/NOPB application, or LM3722EM5-3.08/NOPB equivalent, key selection criteria include reset threshold tolerance (±1.5%), extended temperature operation (−40°C to +125°C), low 6 µA supply current, open-drain compatibility via external pull-up, and MR input debouncing with 22 kΩ internal pull-up.
Technical Context
The LM3722EM5-3.08/NOPB implements a precision bandgap-based voltage comparator with 1.225 V reference, monitoring VCC against a factory-trimmed 3.08 V threshold. Its reset assertion logic includes a one-shot timer ensuring minimum 100 ms (typical 190 ms) active-low pulse after VCC recovery.
It features a fully debounced manual reset (MR) input with 2 µs propagation delay, 10 µs minimum pulse width immunity, and internal 22 kΩ pull-up. The active-low push-pull RESET output remains valid for VCC ≥ 1 V and sinks up to 3.2 mA at VTH min.
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 91.8–95.2% tolerance window |
| Reset Timeout | 190 ms typical - ensures sufficient microprocessor initialization time after power stabilization |
| Supply Current | 6 µA typical at 3.6 V - enables long battery life in portable equipment without compromising supervision reliability |
| Operating Temp | −40°C to +125°C - supports extended-temperature industrial and automotive under-hood applications |
| VCC Range | 1.0 V to 5.5 V - guarantees functional RESET output even during deep brown-out conditions |
| MR Input Pull-Up | 22 kΩ internal - eliminates need for external resistor in manual reset switch interface |
| RESET Sink Current | 3.2 mA at VTH min - drives standard CMOS/TTL inputs directly without buffer stages |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.15 mm body, gull-wing leads, RoHS-compliant, green finish (Pb-free, no Sb/Br), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference and substrate connection - must be tied to system ground plane for stable comparator operation |
| 2 | GND | Second ground terminal - improves noise immunity and thermal dissipation in high-reliability layouts |
| 3 | RESET | Active-low push-pull output - asserts low during power-up/brown-out and holds for 190 ms after VCC recovery |
| 4 | MR | Manual reset input - initiates forced reset when pulled below 0.25×VCC; internally pulled up to VCC via 22 kΩ |
| 5 | VCC | Supply input - accepts 1.0–5.5 V; powers internal reference, comparators, and reset logic |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08 V threshold | ±1.5% tolerance over −40°C to +125°C - eliminates need for external trimming in 3.3 V systems |
| Extended temperature range | −40°C to +125°C operation - qualified for harsh industrial environments without derating |
| Low quiescent current | 6 µA typical - reduces standby power in battery-backed controllers and IoT edge nodes |
| Guaranteed RESET validity | Functional down to VCC = 1 V - prevents undefined microprocessor state during deep undervoltage events |
| Debounced MR input | 100 ns glitch immunity and 22 kΩ internal pull-up - simplifies front-panel reset switch design |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Power sequencing and fault recovery in distributed I/O modules exposed to wide ambient temperatures and EMI. IC Role / Device Role / Timing Role: Monitors 3.3 V MCU supply and asserts active-low RESET during brown-out or cold crank events. Use Value: Prevents firmware corruption by ensuring microcontroller resets cleanly before executing code during unstable rail conditions. | Use Scenario: Supervising microcontrollers in door module ECUs where battery voltage dips below 6 V during cranking. IC Role / Device Role / Timing Role: Detects 3.3 V supply collapse and holds RESET low for 190 ms after recovery to guarantee safe MCU boot. Use Value: Eliminates spurious reboots caused by transient undervoltage, improving system robustness without software intervention. |
| Portable Medical Sensors | Smart Energy Meters |
Use Scenario: Battery-powered glucose monitors requiring reliable startup and low-power supervision between measurements. IC Role / Device Role / Timing Role: Provides power-on reset and brown-out detection while consuming only 6 µA during sleep mode. Use Value: Extends battery life by >2 years versus higher-current supervisors, with no compromise on reset timing accuracy. | Use Scenario: Metering ICs powered from switched-mode supplies subject to line transients and load surges. IC Role / Device Role / Timing Role: Monitors isolated 3.3 V domain and triggers hardware reset if supply drops below 3.08 V for >20 µs. Use Value: Meets IEC 62053-21 immunity requirements by rejecting sub-100 ns glitches and holding reset for full timeout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G30DBVR | 3.0 V threshold (±0.5%), 200 ms timeout, 1.8–6.0 V VCC range, 1.6 µA IQ | Higher accuracy and lower current, but requires external pull-up for open-drain output | Preferred for ultra-low-power designs where tighter threshold tolerance justifies added BOM cost |
| MAX810LUR31+T | 3.08 V threshold (±2.5%), 140 ms timeout, −40°C to +85°C, 2.5 µA IQ | Narrower temperature range and looser tolerance; lacks MR input | Suitable for cost-sensitive consumer applications where extended temp and manual reset are not required |
Compared with TPS3808G30DBVR and MAX810LUR31+T, the LM3722EM5-3.08/NOPB delivers superior thermal stability (±1.5% over −40°C to +125°C), integrated MR debouncing, and guaranteed operation down to VCC = 1 V - making it optimal for industrial and automotive reset-critical subsystems.
Availability
LM3722EM5-3.08/NOPB is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and portable medical sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM3722EM5-3.08/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 microcontroller technologies.
The LM3722EM5-3.08/NOPB belongs to TI's precision voltage supervisor product line, engineered specifically for reliable power-on reset, brown-out protection, and manual reset in industrial, automotive, and portable systems demanding extended temperature operation and low quiescent current.
FAQ
What is the exact reset threshold voltage of the LM3722EM5-3.08/NOPB and how tightly is it specified?
The LM3722EM5-3.08/NOPB has a factory-trimmed reset threshold of 3.08 V with ±1.5% tolerance over the full −40°C to +125°C operating range. This specification ensures reliable monitoring of nominal 3.3 V supplies within the 91.8–95.2% window defined by industry standards. The LM3722EM5-3.08/NOPB achieves this using a precision 1.225 V bandgap reference and laser-trimmed resistive divider, validated per TI's SNVS154E datasheet.
Does the LM3722EM5-3.08/NOPB support manual reset functionality, and how is it implemented?
Yes, the LM3722EM5-3.08/NOPB includes a dedicated Manual Reset (MR) input (Pin 4) with built-in 22 kΩ internal pull-up to VCC. When pulled below 0.25×VCC for >10 µs, it asserts RESET after a 2 µs propagation delay and holds it active for the full 190 ms timeout. The LM3722EM5-3.08/NOPB also rejects glitches ≤100 ns, eliminating need for external RC filtering in most switch-debounce applications.
What is the minimum VCC level at which the LM3722EM5-3.08/NOPB guarantees valid RESET output behavior?
The LM3722EM5-3.08/NOPB guarantees functional RESET output down to VCC = 1.0 V, as confirmed in its Electrical Characteristics table. Below this, the output may not sink rated current, but above 1 V, the LM3722EM5-3.08/NOPB maintains specified VOL ≤0.4 V at 3.2 mA sink load and ensures deterministic logic levels for interfacing with standard CMOS microcontrollers.
How does the LM3722EM5-3.08/NOPB handle power supply transients, and what is its immunity specification?
The LM3722EM5-3.08/NOPB provides inherent immunity to short negative-going VCC transients: a 125 mV dip below threshold lasting ≤40 µs will not trigger reset. This is achieved via internal comparator hysteresis and filtering, validated in Figure 14 of the SNVS154E datasheet. Adding a 0.1 µF bypass capacitor near the VCC pin further enhances transient rejection for the LM3722EM5-3.08/NOPB.
What package type and environmental compliance does the LM3722EM5-3.08/NOPB use?
The LM3722EM5-3.08/NOPB is housed in a RoHS-compliant SOT-23-5 (DBV) package with green finish (Pb-free, no Sb/Br), JEDEC MSL Level-1 rating, and dimensions of 2.9 mm × 1.6 mm × 1.15 mm. It meets TI's extended-temperature qualification for −40°C to +125°C operation and carries the device marking "R63B" per TI's PACKAGE OPTION ADDENDUM.
LM3722EM5-3.08/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:
- 3.08V
- 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
LM3722EM5-3.08/NOPB FAQ
1.How can I place an order for LM3722EM5-3.08/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3722EM5-3.08/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 LM3722EM5-3.08/NOPB reliable?
The price and inventory of LM3722EM5-3.08/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3722EM5-3.08/NOPB is usually 5 days.
3.What payment methods are accepted for LM3722EM5-3.08/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3722EM5-3.08/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3722EM5-3.08/NOPB?
LM3722EM5-3.08/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3722EM5-3.08/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 LM3722EM5-3.08/NOPB?
For technical support, including LM3722EM5-3.08/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3722EM5-3.08/NOPB requirements.
6.How does Aetrix verify that LM3722EM5-3.08/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3722EM5-3.08/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 LM3722EM5-3.08/NOPB meets industry standards.
7.What is the process for return or replacement of LM3722EM5-3.08/NOPB?
All LM3722EM5-3.08/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3722EM5-3.08/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 LM3722EM5-3.08/NOPB part is unused and in its original packaging.
Return procedure for LM3722EM5-3.08/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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