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Texas Instruments LM809M3-2.93/NOPB
- Part No.:
- LM809M3-2.93/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM809M3-2.93/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,180
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Product details
Overview
LM809M3-2.93/NOPB from Texas Instruments is a 3-pin SOT-23 microprocessor supervisory circuit with a factory-programmed 2.93 V reset threshold, active-low RESET output, 240 ms typical reset timeout, and 15 µA typical supply current. It monitors VCC in brown-out, power-up, and power-down conditions for 3.3 V systems and ensures reliable µP initialization in industrial controllers and battery-powered instrumentation.
For engineers reviewing the LM809M3-2.93/NOPB datasheet, LM809M3-2.93/NOPB pinout, LM809M3-2.93/NOPB application, or LM809M3-2.93/NOPB equivalent, key selection criteria include precise 2.93 V threshold tolerance (±30 mV at 25°C), guaranteed RESET validity down to VCC ≥ 1 V, immunity to VCC transients ≤ 20 µs, and full specification across –40°C to 105°C.
Technical Context
The LM809M3-2.93/NOPB implements a precision voltage comparator with internal reference to detect VCC falling below 2.93 V, asserting active-low RESET until VCC rises above threshold and remains stable for 240 ms. Its architecture ensures monotonic reset assertion without chatter during slow-rising VCC.
It operates over 1.0–5.5 V input range with thermal stability up to 105°C ambient, uses no external components, and features built-in transient immunity-rejecting negative VCC glitches ≤ 100 mV amplitude and ≤ 20 µs duration without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±30 mV at 25°C; tight tolerance ensures reliable detection of 3.3 V supply droop to 86–90% nominal. |
| Reset Timeout | 240 ms typical after VCC rise; guarantees µP reset hold time exceeds minimum boot requirement of most 8/16-bit microcontrollers. |
| Supply Current | 15 µA typical at 25°C; enables use in always-on battery-backed systems with multi-year runtime. |
| Operating Temp | –40°C to +105°C; supports deployment in factory automation enclosures and automotive under-hood environments. |
| VCC Range | 1.0 V to 5.5 V; ensures valid RESET output even during deep brown-out, enabling safe system halt before logic corruption. |
| Output Type | Active-low open-drain RESET; compatible with standard µP reset inputs requiring pull-up and tolerant of bidirectional I/O pins. |
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 |
|---|---|---|
| GND (Pin 1) | Ground reference | Provides return path for internal comparator and RESET driver; must be connected directly to system ground plane for noise immunity. |
| RESET (Pin 2) | Active-low reset output | Open-drain output asserted low during fault; requires external pull-up to VCC or µP reset rail to generate logic-level signal. |
| VCC (Pin 3) | Supply input | Monitored voltage source; connects to 3.3 V rail being supervised; bypass capacitor (0.1 µF) recommended adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93 V threshold | Guarantees reset activation at exactly 86–90% of 3.3 V nominal supply, preventing premature release during marginal voltage recovery. |
| 240 ms reset timeout | Ensures sufficient hold time for full µP initialization sequence, including oscillator stabilization and register clearing. |
| VCC ≥ 1 V RESET validity | Maintains defined logic state on RESET pin even during deep undervoltage, avoiding floating inputs that cause undefined µP behavior. |
| 15 µA supply current | Minimizes quiescent drain in battery-operated devices such as portable data loggers and remote sensors. |
| 20 µs VCC transient immunity | Rejects common switching noise and ESD-induced dips without spurious reset generation, eliminating need for additional filtering. |
Applications
| Industrial PLC I/O Module | Smart Energy Meter |
|---|---|
Use Scenario: Monitors 3.3 V auxiliary supply powering communication ICs and isolated gate drivers in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to halt firmware execution until stable 3.3 V rail is confirmed post-power-up or brown-out recovery. Use Value: Prevents corrupted CAN/RS-485 frame transmission during unstable supply by enforcing deterministic reset timing aligned to µP clock startup. | Use Scenario: Supervises 3.3 V supply for metrology ADC and real-time clock in utility-grade electricity meters operating in wide-temperature outdoor enclosures. IC Role / Device Role / Timing Role: Voltage monitor generating 240 ms reset pulse to ensure accurate timekeeping initialization and analog front-end calibration before measurement cycles begin. Use Value: Eliminates meter reading errors caused by partial ADC initialization during cold-start voltage ramp, meeting ANSI C12.20 Class 0.2 accuracy requirements. |
| Portable Gas Detector | Automotive Body Control Module |
Use Scenario: Watches 3.3 V rail derived from Li-ion battery via LDO in handheld hazardous gas analyzers with ultra-low-power sleep modes. IC Role / Device Role / Timing Role: Low-current (15 µA) supervisor providing fail-safe reset during battery voltage sag below 2.93 V, triggering sensor shutdown and alarm. Use Value: Extends operational battery life while guaranteeing immediate system halt before electrochemical sensor bias drift compromises detection accuracy. | Use Scenario: Monitors 3.3 V domain supplying microcontroller and LIN transceiver in door module ECUs exposed to automotive load-dump transients. IC Role / Device Role / Timing Role: Reset generator with 20 µs transient immunity ensuring no false resets during alternator ripple or ignition coil switching events. Use Value: Maintains functional safety integrity (ISO 26262 ASIL-B support) by preventing unintended MCU reboot during electrical stress conditions. |
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 | 2.93 V threshold, same SOT-23-3 package, but 20 µA max supply current vs 15 µA typical for LM809M3-2.93/NOPB; 140–560 ms reset timeout range vs fixed 240 ms typical. | Wider timeout tolerance may require firmware margin adjustment; higher max current impacts ultra-low-power designs. | Select MAX809TRD3+T only if legacy design compatibility or second-source qualification is required; LM809M3-2.93/NOPB offers tighter timeout consistency. |
| TPS3808G33DBVR | 2.93 V threshold, SOT-23-6 package (not pin-compatible), 1.6 µA typical supply current, adjustable delay option, but requires external capacitor for timeout setting. | Lower power suits energy-harvesting systems; extra pins and external component increase BOM and layout complexity. | Choose TPS3808G33DBVR when sub-µA quiescent current is mandatory and board space allows 6-pin footprint and capacitor placement. |
Compared with MAX809TRD3+T and TPS3808G33DBVR, LM809M3-2.93/NOPB delivers deterministic 240 ms reset timing in a minimal 3-pin footprint with industry-leading 15 µA typical current-ideal for cost-sensitive, space-constrained industrial controls where predictable reset behavior outweighs ultra-low-power or programmability needs.
Availability
LM809M3-2.93/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, portable instrumentation, and automotive body control modules requiring stable component supply and long-term production continuity.
Supply support for LM809M3-2.93/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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and microcontroller solutions.
The LM809 series belongs to TI's microprocessor supervisory product line, engineered specifically for robust, low-cost power monitoring in industrial, automotive, and portable systems where deterministic reset timing and wide-temperature operation are critical.
FAQ
What is the exact reset threshold voltage for LM809M3-2.93/NOPB and how tightly is it specified?
The LM809M3-2.93/NOPB has a factory-trimmed reset threshold of 2.93 V with a maximum deviation of ±30 mV at 25°C, tightening to ±70 mV over the full –40°C to 85°C operating range. This precision ensures reliable supervision of 3.3 V supplies at 86–90% of nominal voltage, as confirmed in TI's SNVS052E datasheet Section 6.5.
Does LM809M3-2.93/NOPB provide a valid RESET output when VCC drops below 1 V?
No-LM809M3-2.93/NOPB guarantees RESET output validity only down to VCC ≥ 1 V. Below this, the RESET pin enters high-impedance state and may float. TI recommends adding a 100 kΩ pull-down resistor from RESET to GND if operation below 1 V is required, per Section 7.3.1.1 of the LM809/LM810 datasheet.
What is the typical reset timeout duration of LM809M3-2.93/NOPB and how does temperature affect it?
The LM809M3-2.93/NOPB provides a typical reset timeout of 240 ms after VCC rises above the 2.93 V threshold, with a guaranteed minimum of 140 ms and maximum of 560 ms across –40°C to 105°C. Figure 5 in the datasheet shows variation remains within ±10 ms from 240 ms between –40°C and 85°C, confirming stable timing for most µP boot sequences.
Can LM809M3-2.93/NOPB be used with microprocessors that have bidirectional reset pins?
Yes-LM809M3-2.93/NOPB can interface with bidirectional reset pins (e.g., Motorola 68HC11) using a 4.7 kΩ series resistor between its open-drain RESET output and the µP pin, as shown in Figure 9 of the datasheet. This prevents contention when the µP drives the line high while LM809M3-2.93/NOPB holds it low during reset assertion.
What package type and lead finish does LM809M3-2.93/NOPB use, and is it RoHS compliant?
LM809M3-2.93/NOPB uses the SOT-23 (DBZ) package with 3 gull-wing leads, matte tin (SN) lead finish, and is RoHS compliant (lead-free). It carries a Moisture Sensitivity Level (MSL) rating of Level-1 at 260°C peak reflow, per TI's orderable addendum in SNVS052E.
LM809M3-2.93/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:
- 2.93V
- 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
LM809M3-2.93/NOPB FAQ
1.How can I place an order for LM809M3-2.93/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM809M3-2.93/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 LM809M3-2.93/NOPB reliable?
The price and inventory of LM809M3-2.93/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM809M3-2.93/NOPB is usually 5 days.
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Once your LM809M3-2.93/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 LM809M3-2.93/NOPB?
For technical support, including LM809M3-2.93/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM809M3-2.93/NOPB requirements.
6.How does Aetrix verify that LM809M3-2.93/NOPB is sourced from the original manufacturer or authorized distributors?
All LM809M3-2.93/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 LM809M3-2.93/NOPB meets industry standards.
7.What is the process for return or replacement of LM809M3-2.93/NOPB?
All LM809M3-2.93/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM809M3-2.93/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 LM809M3-2.93/NOPB part is unused and in its original packaging.
Return procedure for LM809M3-2.93/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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