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Texas Instruments LM809M3X-2.93/NOPB
- Part No.:
- LM809M3X-2.93/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM809M3X-2.93/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:12,212
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Product details
Overview
LM809M3X-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, 15 µA typical supply current, and operation from 1.2 V to 5.5 V over –40°C to +105°C. It monitors VCC in embedded controllers during power-up, brown-out, and power-down to ensure reliable µP initialization.
For engineers reviewing the LM809M3X-2.93/NOPB datasheet, LM809M3X-2.93/NOPB pinout, LM809M3X-2.93/NOPB application, or LM809M3X-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 sub-100 mV/20 µs VCC transients, and compatibility with 3.3 V nominal supply rails in industrial automation and portable systems.
Technical Context
The LM809M3X-2.93/NOPB implements a precision voltage comparator with internal reference to monitor VCC against its fixed 2.93 V threshold. When VCC falls below this level, the active-low RESET pin asserts and remains low for a minimum 140 ms-240 ms typical-after VCC rises above threshold.
Its design ensures functional reset assertion even as VCC declines to 1.2 V (min operating), with RESET output sinking up to 1.2 mA while maintaining VOL ≤ 0.3 V. The device uses no external components and requires only a 0.1 µF bypass capacitor on VCC for transient immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±30 mV at 25°C; tight tolerance enables accurate monitoring of 3.3 V supplies at ~89% undervoltage. |
| Reset Timeout | 240 ms typical after VCC rise; ensures µP completes boot sequence before release from reset. |
| Supply Current | 15 µA typical at 25°C; supports battery-powered equipment with multi-year runtime. |
| Operating Voltage | 1.2 V to 5.5 V; valid RESET output asserted down to VCC = 1.2 V, enabling robust low-voltage operation. |
| VCC Transient Immunity | Immune to VCC glitches ≤100 mV amplitude and ≤20 µs duration; prevents false resets in noisy environments. |
| Output Type | Active-low open-drain RESET; compatible with standard µP reset inputs requiring pull-up. |
| Temperature Range | –40°C to +105°C; qualified for industrial and automotive under-hood applications. |
Pinout & Package
SOT-23 (DBZ) package, 2.92 mm × 1.30 mm body size, 3-pin surface-mount outline with gull-wing leads. RoHS-compliant, Sn lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane. |
| RESET | Active-low reset output | Open-drain output; sinks current when asserted (low); requires external pull-up for logic-high state. |
| VCC | Supply input | Monitored power rail input; powers internal circuitry and defines reset threshold reference point. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93 V threshold | ±30 mV tolerance at 25°C ensures reliable detection of 3.3 V supply droop to 89% of nominal. |
| Guaranteed RESET validity down to VCC = 1.2 V | Enables deterministic reset behavior during deep brown-out conditions without external support circuitry. |
| 240 ms typical reset timeout | Provides sufficient hold time for slow-starting µPs and peripheral initialization sequences. |
| 15 µA typical supply current | Minimizes quiescent load on battery or low-power rails in portable and energy-conscious designs. |
| VCC transient immunity (≤20 µs / ≤100 mV) | Eliminates need for additional filtering in electrically noisy industrial control environments. |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
Use Scenario: Monitors 3.3 V microcontroller supply in programmable logic controller during factory power cycling and grid voltage sags. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to halt µP execution until stable 3.3 V rail is confirmed. Use Value: Prevents corrupted firmware execution during undervoltage events, ensuring deterministic boot and I/O state recovery. |
Use Scenario: Ensures reliable startup of metrology SoC in utility-grade electricity meters exposed to intermittent AC line dropout. IC Role / Device Role / Timing Role: Voltage supervisor generating 240 ms reset pulse synchronized to 3.3 V rail recovery after brown-out. Use Value: Guarantees accurate energy accumulation by preventing partial register writes during unstable power conditions. |
| Portable Medical Sensor Hub | Automotive Body Control Module |
Use Scenario: Powers ultra-low-power sensor aggregation node running on coin-cell battery with 3.0 V nominal supply. IC Role / Device Role / Timing Role: Reset generator with 15 µA quiescent current that asserts reset if battery drops below 2.93 V. Use Value: Extends usable battery life while preserving data integrity by halting operation before critical voltage collapse. |
Use Scenario: Monitors 3.3 V domain powering CAN transceiver and MCU in vehicle door module subjected to load dump transients. IC Role / Device Role / Timing Role: Immune supervisor detecting sustained undervoltage (not noise spikes) to initiate safe shutdown sequence. Use Value: Avoids spurious resets during cranking or alternator ripple, improving system robustness per ISO 16750-2. |
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 1.2 V min VCC and 120 ms min timeout (vs. 140 ms min for LM809). | Lower minimum VCC allows earlier reset assertion during deep brown-out; shorter timeout may not meet all µP requirements. | Select MAX809TRD3+T only if system timing budget permits <240 ms reset hold and deeper undervoltage detection is needed. |
| TPS3808G12QDBVRQ1 | Adjustable threshold (via external resistor), 25 µA supply current, AEC-Q100 qualified, but requires external components. | Designed for automotive safety-critical systems; lacks factory-trimmed simplicity and ultra-low quiescent current of LM809. | Choose TPS3808G12QDBVRQ1 when AEC-Q100 compliance or programmable threshold is mandatory; otherwise LM809M3X-2.93/NOPB offers lower BOM count and power. |
Compared with MAX809TRD3+T and TPS3808G12QDBVRQ1, LM809M3X-2.93/NOPB delivers optimal balance of precision threshold, zero-component integration, lowest quiescent current, and industrial temperature range-making it ideal for cost-sensitive, space-constrained, and battery-aware embedded systems where fixed 2.93 V supervision suffices.
Availability
LM809M3X-2.93/NOPB is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, portable medical sensor hubs, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM809M3X-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 delivering analog and embedded processing solutions, with leadership in power management, signal chain, and microcontrollers.
The LM809 series belongs to TI's microprocessor supervisory IC product line, designed specifically to provide simple, reliable, and low-power reset functionality for µP-based systems operating in harsh industrial and automotive environments.
FAQ
What is the exact reset threshold voltage of LM809M3X-2.93/NOPB and how tightly is it specified?
The LM809M3X-2.93/NOPB has a factory-programmed reset threshold of 2.93 V, with a maximum deviation of ±30 mV at 25°C and ±70 mV over the full –40°C to +105°C operating range. This precision enables accurate supervision of 3.3 V supplies at approximately 89% of nominal voltage, as confirmed in TI's SNVS052E datasheet Section 6.5.
Does LM809M3X-2.93/NOPB assert reset when VCC falls below 1 V?
No - LM809M3X-2.93/NOPB guarantees valid RESET output only for VCC ≥ 1.2 V (minimum recommended operating voltage). Below 1.2 V, the internal circuitry cannot sustain proper comparator operation or output drive strength. The datasheet explicitly states RESET is ensured valid for VCC ≥ 1 V, but functional specification begins at 1.2 V per Recommended Operating Conditions.
What is the minimum reset pulse width guaranteed by LM809M3X-2.93/NOPB across temperature?
LM809M3X-2.93/NOPB guarantees a minimum reset active timeout of 140 ms over –40°C to +85°C, and 100 ms over +85°C to +105°C. The typical value is 240 ms at 25°C. These values are measured from the moment VCC rises above the threshold until RESET deasserts, as defined in Electrical Characteristics Table 6.5.
Can LM809M3X-2.93/NOPB be used with a 3.0 V nominal supply?
Yes - LM809M3X-2.93/NOPB is explicitly designed for 3.0 V and 3.3 V systems. Its 2.93 V threshold corresponds to ~98% of 3.0 V and ~89% of 3.3 V, aligning with industry-standard brown-out detection levels. TI's Application Note SNVS052E Table 1 confirms 2.93 V as a standard option for both 3 V and 3.3 V supply monitoring.
Is LM809M3X-2.93/NOPB pin-compatible with other LM809 variants like LM809M3X-3.08/NOPB?
Yes - all LM809M3X-x.x/NOPB variants share identical SOT-23 (DBZ) 3-pin packaging, pinout (GND–RESET–VCC), and footprint. Only the factory-trimmed reset threshold differs; electrical and mechanical compatibility is maintained across the family, enabling drop-in replacement where threshold requirements match.
LM809M3X-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
LM809M3X-2.93/NOPB FAQ
1.How can I place an order for LM809M3X-2.93/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM809M3X-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 LM809M3X-2.93/NOPB reliable?
The price and inventory of LM809M3X-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 LM809M3X-2.93/NOPB is usually 5 days.
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LM809M3X-2.93/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM809M3X-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 LM809M3X-2.93/NOPB?
For technical support, including LM809M3X-2.93/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM809M3X-2.93/NOPB requirements.
6.How does Aetrix verify that LM809M3X-2.93/NOPB is sourced from the original manufacturer or authorized distributors?
All LM809M3X-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 LM809M3X-2.93/NOPB meets industry standards.
7.What is the process for return or replacement of LM809M3X-2.93/NOPB?
All LM809M3X-2.93/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM809M3X-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 LM809M3X-2.93/NOPB part is unused and in its original packaging.
Return procedure for LM809M3X-2.93/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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