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Texas Instruments LM809M3-4.00/NOPB
- Part No.:
- LM809M3-4.00/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM809M3-4.00/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,567
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Product details
Overview
LM809M3-4.00/NOPB from Texas Instruments is a 3-pin SOT-23 microprocessor supervisory circuit with active-low reset output, 4.00 V ±3% factory-trimmed threshold, 240 ms typical reset timeout, and 15 µA typical supply current. It monitors VCC in digital systems to assert RESET during power-up, brown-out, and power-down events-used in industrial controllers and battery-powered instrumentation.
For engineers reviewing the LM809M3-4.00/NOPB datasheet, LM809M3-4.00/NOPB pinout, LM809M3-4.00/NOPB application, or LM809M3-4.00/NOPB equivalent, key selection criteria include reset threshold accuracy over temperature (±3% at 25°C, ±100 mV over –40°C to 105°C), guaranteed RESET validity down to VCC ≥ 1 V, and immunity to sub-20 µs VCC transients.
Technical Context
The LM809M3-4.00/NOPB implements a precision voltage comparator with internal bandgap reference to detect when VCC falls below 4.00 V. Its reset assertion is latched and held for a minimum 140 ms, with 240 ms typical timeout after VCC recovers above threshold.
It operates across –40°C to 105°C with full electrical specification, features 30 ppm/°C threshold temperature coefficient, and ensures valid RESET output even as VCC drops to 1 V-enabling reliable boot sequencing in wide-temperature embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00 V ±3% at 25°C; maintains ±100 mV tolerance over –40°C to 105°C for stable 5 V system monitoring |
| Reset Timeout | 240 ms typical; ensures microprocessor reset pulse exceeds minimum boot-hold requirements |
| Supply Current | 15 µA typical at 25°C; enables multi-year operation in low-power portable/battery systems |
| VCC Operating Range | 1.0 V to 5.5 V; guarantees functional RESET assertion down to 1 V, supporting graceful shutdown |
| Output Type | Active-low open-drain RESET; compatible with standard CMOS/TTL logic and pull-up configurations |
| Transient Immunity | Rejects VCC glitches ≤20 µs duration when 100 mV below threshold; reduces false resets in noisy environments |
| ESD Rating | ±2000 V HBM; meets industrial handling requirements without additional protection circuitry |
Pinout & Package
LM809M3-4.00/NOPB uses the industry-standard 3-pin SOT-23 (DBZ) package, measuring 2.92 mm × 1.30 mm, with gull-wing leads optimized for automated assembly and thermal performance (RθJA = 252°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: GND | Ground reference | Provides return path for internal comparator and output stage; must be connected to system ground plane |
| 2: RESET | Active-low reset output | Open-drain output asserted low during fault; requires external pull-up for logic-high state in idle condition |
| 3: VCC | Supply voltage input | Monitored rail input; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00 V threshold | Factory-trimmed to ±3% at 25°C and ±100 mV over full temperature range-ensures consistent 5 V system reset margin |
| Guaranteed RESET validity | RESET output remains functional and defined down to VCC = 1 V, enabling deterministic behavior during deep brown-out |
| Low quiescent current | 15 µA typical supply draw minimizes impact on battery life in portable instrumentation and remote sensors |
| Power supply transient immunity | Immune to VCC glitches ≤20 µs at 100 mV under threshold-eliminates need for external filtering in many applications |
| Wide temperature operation | Fully specified from –40°C to 105°C with no derating-supports deployment in industrial control cabinets and automotive under-hood environments |
Applications
| Industrial PLC I/O Module | Smart Energy Meter |
|---|---|
|
Use Scenario: Monitors 5 V auxiliary supply in programmable logic controller I/O expansion modules subject to field wiring transients and ambient temperature swings. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M7 MCU during brown-out, ensuring deterministic firmware restart. Use Value: 4.00 V threshold aligns with 5 V ±5% nominal rail; 240 ms timeout exceeds MCU's 160 ms minimum reset hold time per datasheet. |
Use Scenario: Powers reset management in Class 0.2S electricity meters operating continuously on 3.6 V Li-SOCl₂ primary cells with seasonal temperature variation. IC Role / Device Role / Timing Role: Low-current supervisor maintaining valid RESET signal down to VCC = 1 V during end-of-life battery discharge. Use Value: 15 µA supply current extends battery service life beyond 15 years; ±100 mV threshold stability prevents spurious resets at –25°C to +70°C operating range. |
| Factory Automation HMI Panel | Renewable Energy Inverter Control Board |
|
Use Scenario: Embedded in human-machine interface panels exposed to ESD events and 24 V DC supply ripple in manufacturing environments. IC Role / Device Role / Timing Role: Provides robust power-on reset to display controller ASIC and validates supply integrity before GUI initialization. Use Value: ±2000 V HBM rating eliminates need for external TVS diodes; 20 µs transient immunity suppresses noise-induced resets from nearby contactor switching. |
Use Scenario: Integrated into solar inverter main control board where 5 V rail experiences rapid load transients during MPPT algorithm execution. IC Role / Device Role / Timing Role: Resets DSP-based controller during grid voltage sags, preventing corrupted PWM generation and unsafe gate drive states. Use Value: 4.00 V threshold triggers reset before 5 V rail collapses below 4.2 V-preserving safe shutdown sequence and avoiding latch-up in power stage drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3-T | 4.00 V threshold, but 140 ms min reset timeout (vs. 240 ms typical for LM809M3-4.00/NOPB); higher 20 µA max ICC | Valid for cost-sensitive consumer designs where shorter reset pulse suffices; less suitable for MCUs requiring >200 ms hold time | Select MAX809TRD3-T only if timing budget allows reduced timeout and supply current margin is acceptable |
| TPS3808G33DBVR | 3.3 V threshold (not 4.00 V); adjustable delay option; 1.4 µA ultra-low ICC; requires external capacitor for timing | Designed for 3.3 V systems-not a direct replacement; better for ultra-low-power IoT nodes than 5 V industrial rails | Choose TPS3808G33DBVR only for new 3.3 V designs prioritizing nanoamp current; not interchangeable with LM809M3-4.00/NOPB |
Compared with MAX809TRD3-T and TPS3808G33DBVR, LM809M3-4.00/NOPB delivers longer and more predictable reset timing for 5 V systems, lower typical supply current than MAX809, and exact 4.00 V threshold alignment-making it optimal for industrial controllers requiring deterministic boot reliability.
Availability
LM809M3-4.00/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, factory automation HMIs, and renewable energy inverters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM809M3-4.00/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 connectivity technologies, with decades of experience in high-reliability power management and supervisory ICs.
LM809M3-4.00/NOPB belongs to TI's microprocessor supervisory product line, engineered specifically for robust power-on reset, brown-out detection, and system-level reliability in industrial and automotive-qualified applications.
FAQ
What is the exact reset threshold voltage for LM809M3-4.00/NOPB?
The LM809M3-4.00/NOPB has a factory-programmed reset threshold of 4.00 V, with ±3% tolerance at 25°C and ±100 mV over the full –40°C to 105°C operating range. This value is verified per TI's SNVS052E datasheet Section 6.5, ensuring precise monitoring of 5 V nominal supplies without external calibration.
Does LM809M3-4.00/NOPB support operation below 1.5 V VCC?
Yes, LM809M3-4.00/NOPB guarantees functional RESET output down to VCC = 1.0 V, as specified in Section 6.3 of the datasheet. Below 1 V, the RESET output becomes high-impedance; however, the device remains fully operational and asserts valid low-state RESET while VCC ≥ 1 V.
What is the typical reset timeout duration for LM809M3-4.00/NOPB?
The LM809M3-4.00/NOPB provides a typical reset timeout of 240 ms after VCC rises above the 4.00 V threshold, with a guaranteed minimum of 140 ms and maximum of 560 ms over temperature. This ensures compatibility with microprocessors requiring ≥200 ms reset pulse widths.
Can LM809M3-4.00/NOPB replace LM809M3-4.38/NOPB in an existing design?
No-LM809M3-4.00/NOPB and LM809M3-4.38/NOPB have different factory-set thresholds (4.00 V vs. 4.38 V) and are not functionally interchangeable. Substituting them would shift the reset point by 380 mV, potentially causing premature or delayed reset assertion in 5 V systems.
What package type and dimensions does LM809M3-4.00/NOPB use?
LM809M3-4.00/NOPB uses the SOT-23 (DBZ) package: 3-pin, gull-wing leaded, with nominal body size 2.92 mm × 1.30 mm and 1.12 mm max height. Pin 1 orientation follows quadrant Q3 tape configuration per TI's packaging documentation.
LM809M3-4.00/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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4V
- 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
LM809M3-4.00/NOPB FAQ
1.How can I place an order for LM809M3-4.00/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM809M3-4.00/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 LM809M3-4.00/NOPB reliable?
The price and inventory of LM809M3-4.00/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM809M3-4.00/NOPB is usually 5 days.
3.What payment methods are accepted for LM809M3-4.00/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM809M3-4.00/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM809M3-4.00/NOPB?
LM809M3-4.00/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM809M3-4.00/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 LM809M3-4.00/NOPB?
For technical support, including LM809M3-4.00/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM809M3-4.00/NOPB requirements.
6.How does Aetrix verify that LM809M3-4.00/NOPB is sourced from the original manufacturer or authorized distributors?
All LM809M3-4.00/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 LM809M3-4.00/NOPB meets industry standards.
7.What is the process for return or replacement of LM809M3-4.00/NOPB?
All LM809M3-4.00/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM809M3-4.00/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 LM809M3-4.00/NOPB part is unused and in its original packaging.
Return procedure for LM809M3-4.00/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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