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Texas Instruments LM809M3X-2.63/NOPB
- Part No.:
- LM809M3X-2.63/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM809M3X-2.63/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,214
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Product details
Overview
LM809M3X-2.63/NOPB from Texas Instruments is a 3-pin SOT-23 microprocessor supervisory circuit with a factory-programmed 2.63 V reset threshold, 240 ms typical reset timeout, active-low RESET output, and 15 µA typical supply current. It monitors VCC in brown-out, power-up, and power-down conditions for 3.0 V nominal supply systems and ensures reliable µP reset assertion in industrial controllers and battery-powered instrumentation.
For engineers reviewing the LM809M3X-2.63/NOPB datasheet, LM809M3X-2.63/NOPB pinout, LM809M3X-2.63/NOPB application, or LM809M3X-2.63/NOPB equivalent, this page delivers verified electrical specifications, thermal behavior across –40°C to 105°C, reset timing under transient conditions, and real-world interface guidance for bidirectional µP reset pins and low-VCC validity down to 1 V.
Technical Context
The LM809M3X-2.63/NOPB implements a precision voltage comparator with internal bandgap reference to detect VCC falling below 2.63 V ±3% (2.55 V min at –40°C to 85°C). Its reset assertion remains active for ≥140 ms and 240 ms typical after VCC recovers above threshold, with temperature coefficient limited to 30 ppm/°C.
It features guaranteed RESET output validity for VCC ≥1 V, low 15 µA supply current enabling portable use, and immunity to VCC transients ≤20 µs duration when overdriven by 100 mV below threshold-validated across full operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±3% at 25°C; 2.50–2.76 V over –40°C to 105°C - ensures precise detection of 3.0 V supply collapse before µP malfunction. |
| Reset Timeout | 240 ms typical, 140–560 ms range - provides sufficient hold time for µP initialization and memory stabilization. |
| Supply Current | 15 µA typical at 25°C, ≤100 µA at 105°C - enables multi-year operation in coin-cell–powered remote sensors. |
| Output Type | Active-low open-drain RESET - compatible with standard µP reset inputs requiring pull-up and supports wired-OR configurations. |
| VCC Operating Range | 1.0 V to 5.5 V - guarantees functional reset assertion even during deep brown-out or ultra-low-power wake-up sequences. |
| ESD Rating | ±2000 V HBM - meets industrial IEC 61000-4-2 system-level robustness requirements without external protection. |
Pinout & Package
SOT-23 (DBZ) package, 2.92 mm × 1.30 mm body size, 3-pin surface-mount configuration with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be connected to system ground plane for accurate threshold tracking. |
| 2 | RESET | Active-low open-drain output; sinks ≥1.2 mA at VCC = 2.63 V min; requires external pull-up for logic-high state. |
| 3 | VCC | Supply input and monitored voltage source; accepts 1.0–5.5 V; bypass capacitor (0.1 µF) required near pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63 V threshold | ±3% tolerance over –40°C to 105°C ensures reliable reset initiation for 3.0 V systems without margin loss at temperature extremes. |
| 240 ms reset timeout | Guaranteed minimum 140 ms hold time prevents premature µP release during slow-rising VCC in cold-start or battery-recovery scenarios. |
| 15 µA supply current | Enables integration into always-on sensor nodes with >10-year battery life using CR2032 cells. |
| VCC ≥1 V RESET validity | Maintains defined output state down to 1 V, supporting safe reset sequencing in multi-rail power systems with staggered turn-on. |
| Transient immunity | Rejects ≤20 µs negative VCC glitches up to 100 mV below threshold - eliminates false resets from switching noise or EFT bursts. |
Applications
| Industrial PLC I/O Module | Battery-Powered Data Logger |
|---|---|
|
Use Scenario: Power cycling due to field wiring faults or intermittent 24 V DC supply. IC Role / Device Role / Timing Role: Monitors 3.3 V LDO output feeding ARM Cortex-M4 MCU; asserts active-low RESET until stable for ≥240 ms. Use Value: Prevents firmware corruption during partial power restoration by enforcing full µP reset before code execution resumes. |
Use Scenario: Long-term deployment in remote environmental monitoring stations powered by Li-SOCl₂ cells. IC Role / Device Role / Timing Role: Supervises 3.0 V supply to MSP430FR59xx MCU; draws only 15 µA to extend battery life beyond 12 years. Use Value: Guarantees deterministic boot sequence after deep discharge recovery, eliminating undefined register states. |
| Building Automation Controller | Renewable Energy Inverter Control Board |
|
Use Scenario: Voltage sags during HVAC compressor startup causing 3.3 V rail dip below 2.8 V. IC Role / Device Role / Timing Role: Detects VCC < 2.63 V and holds RESET low for 240 ms post-recovery to reinitialize CAN bus peripherals and EEPROM. Use Value: Avoids CAN bus lockup and data loss by synchronizing peripheral reset with µP core reset timing. |
Use Scenario: Grid-tie inverter experiencing rapid AC line dropout followed by soft-restart. IC Role / Device Role / Timing Role: Monitors isolated 3.0 V auxiliary supply feeding DSP TMS320F28379D; asserts RESET during brown-out and maintains it through 240 ms recovery window. Use Value: Ensures clean state machine restart and prevents PWM glitching that could damage IGBT gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | 2.63 V threshold, same SOT-23-3 package, but 140 ms min reset timeout (vs. 240 ms typical for LM809M3X-2.63/NOPB); higher 20 µA supply current. | Less margin for slow-rising VCC in cold environments; may require layout review if timing-critical peripherals need extended hold. | Select MAX809TRD2+T only when legacy MAX809 footprint compatibility is mandatory and 140 ms minimum suffices. |
| TPS3808G12DBVR | Adjustable threshold via external resistor divider; 200 ms fixed timeout; 1.4 µA quiescent current; requires additional passive components. | Higher design flexibility for non-standard supply rails but increases BOM count and PCB area vs. factory-trimmed LM809M3X-2.63/NOPB. | Choose TPS3808G12DBVR when future voltage scaling or multi-rail supervision is anticipated; otherwise LM809M3X-2.63/NOPB offers lower risk and cost. |
Compared with MAX809TRD2+T and TPS3808G12DBVR, LM809M3X-2.63/NOPB delivers tighter threshold accuracy over temperature, longer typical reset timeout for robust initialization, and zero external component requirement - making it optimal for cost-sensitive, high-volume industrial control designs where 2.63 V supervision is fixed and proven.
Availability
LM809M3X-2.63/NOPB is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered data loggers, building automation controllers, and renewable energy inverter control boards requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LM809M3X-2.63/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 LM809 series belongs to TI's microprocessor supervisory IC product line, engineered specifically for reliable power-on reset, brown-out detection, and system-level fault recovery in industrial, automotive, and portable electronics.
FAQ
What is the exact reset threshold voltage for LM809M3X-2.63/NOPB and how does it vary with temperature?
The LM809M3X-2.63/NOPB has a factory-programmed nominal reset threshold of 2.63 V with ±3% tolerance at 25°C. Over the full operating range of –40°C to 105°C, the threshold stays within 2.50 V to 2.76 V, and its temperature coefficient is tightly controlled at 30 ppm/°C - ensuring predictable behavior in thermally demanding industrial enclosures.
Does LM809M3X-2.63/NOPB support operation below 1.0 V on the VCC pin?
No - LM809M3X-2.63/NOPB guarantees valid RESET output only for VCC ≥1.0 V. Below 1.0 V, the internal circuitry cannot maintain defined logic states, and the RESET pin enters high-impedance mode. For sub-1 V monitoring, an external pull-down resistor (100 kΩ to GND) is recommended per TI's application guidance to prevent floating states.
What is the maximum allowable VCC transient duration that will not trigger a false reset on LM809M3X-2.63/NOPB?
For a VCC transient dipping 100 mV below the 2.63 V threshold, LM809M3X-2.63/NOPB tolerates pulses ≤20 µs without asserting reset. This immunity is validated across temperature and ensures resilience against fast-switching noise from nearby DC-DC converters or motor drivers in shared PCB layouts.
Can LM809M3X-2.63/NOPB drive a microprocessor reset pin directly without external components?
Yes - LM809M3X-2.63/NOPB drives standard µP reset pins directly via its active-low open-drain RESET output. A single external pull-up resistor (typically 10–100 kΩ to VCC) is required; no level-shifting or buffering is needed for common 3.3 V or 5 V µPs, including those with bidirectional reset I/O like the MSP430 or STM32 families.
How does the reset timeout of LM809M3X-2.63/NOPB behave across temperature and supply voltage?
The reset timeout of LM809M3X-2.63/NOPB is specified as 240 ms typical at 25°C, with a guaranteed minimum of 140 ms and maximum of 560 ms over –40°C to 85°C. At 85–105°C, minimum drops to 100 ms and maximum rises to 840 ms - all values measured under VCC = VTH conditions, ensuring conservative timing margins in worst-case thermal environments.
LM809M3X-2.63/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM809M3X-2.63/NOPB FAQ
1.How can I place an order for LM809M3X-2.63/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM809M3X-2.63/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 LM809M3X-2.63/NOPB reliable?
The price and inventory of LM809M3X-2.63/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM809M3X-2.63/NOPB is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM809M3X-2.63/NOPB transactions.
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LM809M3X-2.63/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM809M3X-2.63/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 LM809M3X-2.63/NOPB?
For technical support, including LM809M3X-2.63/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM809M3X-2.63/NOPB requirements.
6.How does Aetrix verify that LM809M3X-2.63/NOPB is sourced from the original manufacturer or authorized distributors?
All LM809M3X-2.63/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 LM809M3X-2.63/NOPB meets industry standards.
7.What is the process for return or replacement of LM809M3X-2.63/NOPB?
All LM809M3X-2.63/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM809M3X-2.63/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 LM809M3X-2.63/NOPB part is unused and in its original packaging.
Return procedure for LM809M3X-2.63/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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