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Texas Instruments LM809M3X-3.08
- Part No.:
- LM809M3X-3.08
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM809M3X-3.08.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,674
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Product details
Overview
LM809M3X-3.08 from Texas Instruments is a 3-pin SOT-23 microprocessor reset supervisor IC with a factory-programmed 3.08 V ±3% precision reset threshold, 240 ms typical active-low reset pulse width, and 15 µA typical supply current. It monitors 3.3 V supply rails in embedded controllers and ensures reliable power-up/power-down reset assertion for industrial automation and portable equipment.
For engineers reviewing the LM809M3X-3.08 datasheet, LM809M3X-3.08 pinout, LM809M3X-3.08 application, or LM809M3X-3.08 equivalent, key selection criteria include reset threshold accuracy over temperature (±3% at –40°C to 105°C), guaranteed RESET validity down to VCC ≥ 1 V, immunity to VCC transients ≤20 µs, and compatibility with bidirectional µP reset pins via 4.7 kΩ series resistor.
Technical Context
The LM809M3X-3.08 implements a precision bandgap-based voltage comparator with internal hysteresis to detect VCC drops below 3.08 V. Its reset output remains asserted low for a minimum of 140 ms and typically 240 ms after VCC rises above threshold, ensuring sufficient time for microprocessor initialization.
It operates across –40°C to 105°C with full specification compliance, supports input voltages from 1.0 V to 5.5 V, and maintains functional reset behavior even as VCC declines to 1 V-critical for brown-out detection in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±3% at 25°C; tight tolerance ensures reliable monitoring of 3.3 V supplies within 90–95% of nominal rail. |
| Reset Pulse Width | 240 ms typical; guarantees sufficient hold time for microprocessor core and peripheral initialization during power-up. |
| Supply Current | 15 µA typical at 25°C; enables use in always-on, low-power battery applications without significant drain. |
| Operating Temperature | –40°C to 105°C; fully specified across industrial temperature range for factory automation and renewable energy systems. |
| VCC Validity Range | RESET output remains valid down to VCC ≥ 1 V; ensures deterministic reset state during deep brown-out conditions. |
| Transient Immunity | Immune to VCC negative transients ≤20 µs when 100 mV below threshold; reduces false triggering from switching noise. |
Pinout & Package
LM809M3X-3.08 is housed in a 3-pin SOT-23 (DBZ) package measuring 2.92 mm × 1.30 mm, optimized for space-constrained PCB layouts in portable and industrial electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Provides return path for internal comparator and output driver; must be connected to system ground plane for stable threshold reference. |
| RESET | Active-low digital output | Drives low during reset condition (VCC < 3.08 V) and for 240 ms after recovery; sinks up to 1.2 mA at 0.3 V. |
| VCC | Supply voltage input | Monitored rail input; accepts 1.0 V to 5.5 V; powers internal circuitry and defines reset threshold reference point. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08 V threshold | ±3% tolerance over –40°C to 105°C ensures consistent 3.3 V supply monitoring without external calibration. |
| Guaranteed 240 ms reset timeout | Meets JEDEC JESD78 requirements for microprocessor reset timing, eliminating need for external RC timing components. |
| Low 15 µA quiescent current | Enables integration into always-on subsystems (e.g., real-time clocks, sensor wake logic) without compromising battery life. |
| VCC transient immunity | Rejects short-duration noise spikes on supply rail, preventing spurious resets in electrically noisy industrial environments. |
| Valid RESET down to VCC = 1 V | Ensures deterministic reset state during gradual brown-out, critical for data integrity in non-volatile memory write operations. |
Applications
| Programmable Logic Controller (PLC) | Renewable Energy Inverter |
|---|---|
Use Scenario: Monitors 3.3 V auxiliary supply powering FPGA configuration logic and communication interfaces in modular PLC backplanes. IC Role / Device Role / Timing Role: Provides power-on reset signal to FPGA and isolated UART during cold start and grid voltage sag recovery. Use Value: Prevents partial configuration and bus lockup by guaranteeing 240 ms minimum reset hold time independent of input capacitor discharge rate. | Use Scenario: Supervises 3.3 V MCU supply in solar inverter control board exposed to wide ambient temperature swings and EMI from high-current switching. IC Role / Device Role / Timing Role: Asserts active-low reset to ARM Cortex-M4 during DC-link voltage collapse or thermal shutdown events. Use Value: Precision 3.08 V threshold tracks 3.3 V rail degradation under load, enabling early brown-out detection before ADC reference drift affects MPPT accuracy. |
| Portable Medical Monitor | Industrial HMI Panel |
Use Scenario: Powers on/off sequence management for lithium-ion powered patient vital sign display with flash memory logging. IC Role / Device Role / Timing Role: Generates clean reset pulse to microcontroller and display driver IC upon battery insertion or charge cycle completion. Use Value: 15 µA supply current extends standby runtime; valid RESET down to 1 V prevents undefined state during battery depletion. | Use Scenario: Controls reset sequencing for dual-core ARM SoC and touch controller in DIN-rail mounted HMI with 24 V DC input. IC Role / Device Role / Timing Role: Interfaces via 4.7 kΩ series resistor to bidirectional reset pin of NXP i.MX6, isolating SoC-driven reset asserts from supervisor-initiated pulses. Use Value: Eliminates risk of latch-up or contention between SoC and supervisor by enforcing unidirectional reset control with current-limited interface. |
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 | 3.08 V threshold, same SOT-23-3 package, but 140 ms min reset pulse (vs. 140 ms min / 240 ms typ for LM809M3X-3.08); higher 20 µA max ICC. | Valid for cost-sensitive consumer designs where 140 ms minimum suffices; less margin for slow-starting peripherals. | Select MAX809TRD3+T only if design tolerates shorter minimum reset duration and higher worst-case supply current. |
| TPS3808G30DBVR | 3.0 V threshold (not 3.08 V), adjustable delay option, 1.5 µA typical ICC, but requires external capacitor for timing; different pinout (5-pin SOT-23). | Suitable for ultra-low-power designs needing programmable timeout, but adds BOM cost and layout complexity. | Choose TPS3808G30DBVR only when adjustable reset delay or sub-µA quiescent current justifies redesign and component count increase. |
Compared with MAX809TRD3+T and TPS3808G30DBVR, LM809M3X-3.08 delivers tighter threshold accuracy (±3% vs. ±4%), guaranteed 240 ms typical reset timing without external components, and direct drop-in compatibility in existing SOT-23-3 layouts-making it optimal for industrial-grade reliability without design iteration.
Availability
LM809M3X-3.08 is available at Aetrix Electronics and suitable for factory automation, building automation, and programmable logic control applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for LM809M3X-3.08 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 and embedded processing technologies, with decades of experience in power management and system supervision ICs.
The LM809 product line was designed specifically for robust, low-cost microprocessor reset supervision in industrial and automotive environments-emphasizing precision threshold stability, wide temperature operation, and minimal external component count.
FAQ
What is the exact reset threshold voltage of LM809M3X-3.08 and how does it vary with temperature?
The LM809M3X-3.08 has a factory-programmed reset threshold of 3.08 V with ±3% tolerance at 25°C. Over –40°C to 85°C, the threshold remains within 3.00 V to 3.15 V; at 85°C to 105°C, it shifts to 2.92 V to 3.23 V. Its temperature coefficient is 30 ppm/°C, ensuring predictable drift across industrial operating ranges.
Does LM809M3X-3.08 provide an active-high or active-low reset output?
LM809M3X-3.08 provides an active-low RESET output. When VCC falls below 3.08 V, the RESET pin is driven low; it remains low for 240 ms after VCC rises above threshold. This matches standard µP reset input requirements and eliminates need for external inverters.
Can LM809M3X-3.08 operate reliably with supply voltages below 3.3 V?
Yes, LM809M3X-3.08 is fully specified from VCC = 1.0 V to 5.5 V. Its RESET output remains valid down to VCC ≥ 1 V, and its internal circuitry functions correctly across this range-enabling use in brown-out detection for partially discharged batteries or low-voltage microcontrollers.
What is the recommended bypass capacitor for LM809M3X-3.08 and why is it important?
A 0.1 µF ceramic capacitor placed as close as possible to the VCC pin is recommended for LM809M3X-3.08. It suppresses high-frequency noise and short transients on the supply rail, preventing false resets caused by switching regulator ripple or EMI-especially critical in motor drive or inverter applications.
How does LM809M3X-3.08 handle bidirectional reset pins found on some microcontrollers?
LM809M3X-3.08 interfaces safely with bidirectional µP reset pins (e.g., NXP 68HC11) using a 4.7 kΩ series resistor between RESET and the µP pin. This prevents contention when the µP drives the line high while LM809M3X-3.08 holds it low, ensuring clean reset assertion without latch-up risk.
LM809M3X-3.08 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:
- 3.08V
- 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-3.08 FAQ
1.How can I place an order for LM809M3X-3.08 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM809M3X-3.08 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-3.08 reliable?
The price and inventory of LM809M3X-3.08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM809M3X-3.08 is usually 5 days.
3.What payment methods are accepted for LM809M3X-3.08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM809M3X-3.08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM809M3X-3.08?
LM809M3X-3.08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM809M3X-3.08 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-3.08?
For technical support, including LM809M3X-3.08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM809M3X-3.08 requirements.
6.How does Aetrix verify that LM809M3X-3.08 is sourced from the original manufacturer or authorized distributors?
All LM809M3X-3.08 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-3.08 meets industry standards.
7.What is the process for return or replacement of LM809M3X-3.08?
All LM809M3X-3.08 units undergo pre-shipment inspection (PSI). If there is an issue with LM809M3X-3.08, 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-3.08 part is unused and in its original packaging.
Return procedure for LM809M3X-3.08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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