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Texas Instruments LM809M3X-3.08/NOPB
- Part No.:
- LM809M3X-3.08/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM809M3X-3.08/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,330
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Product details
Overview
LM809M3X-3.08/NOPB 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 VCC in 3.3 V digital systems and asserts RESET during power-up, brown-out, and power-down - used in industrial controllers and battery-powered instrumentation.
For engineers reviewing the LM809M3X-3.08/NOPB datasheet, LM809M3X-3.08/NOPB pinout, LM809M3X-3.08/NOPB application, or LM809M3X-3.08/NOPB equivalent, key selection criteria include 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 termination.
Technical Context
The LM809M3X-3.08/NOPB implements a precision bandgap-based voltage comparator with internal hysteresis and a fixed 240 ms reset timeout timer. Its active-low RESET output remains asserted while VCC falls below 3.08 V and for 240 ms after VCC rises above the threshold, ensuring reliable microprocessor initialization across temperature (–40°C to +105°C).
It operates over 1.0 V to 5.5 V supply range, delivers 1.2 mA sink capability at VCC = VTH(min), and maintains reset assertion validity even as VCC declines to 1 V - enabling robust sequencing in low-voltage portable systems where supply collapse must trigger deterministic recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±3% at 25°C; tight tolerance ensures reset activation within 90–95% of nominal 3.3 V supply - critical for avoiding premature release in marginally regulated rails. |
| Reset Pulse Width | 240 ms typical; guarantees sufficient time for microprocessor core, PLLs, and memory to stabilize before release - meets JEDEC JESD78 reliability requirements. |
| Supply Current | 15 µA typical at 25°C; enables multi-year operation in coin-cell–powered IoT sensors without compromising reset integrity. |
| VCC Operating Range | 1.0 V to 5.5 V; supports valid RESET assertion down to 1 V, allowing detection of deep brown-out conditions before full rail collapse. |
| Output Type | Active-low open-drain RESET; compatible with 1.8 V–5 V logic families and permits wired-OR configuration with other reset sources. |
| Temperature Range | –40°C to +105°C; fully specified across industrial temperature range - suitable for factory automation and renewable energy inverters. |
| Transient Immunity | Rejects VCC glitches ≤20 µs duration when overdrive is 100 mV below threshold; reduces false resets in noisy motor-control or switching-power environments. |
Pinout & Package
SOT-23 (DBZ) package, 2.92 mm × 1.30 mm body size, 3-pin surface-mount format with gull-wing leads and moisture sensitivity level 1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Low-impedance return path for internal comparator and output stage; must be connected directly to system ground plane to maintain noise immunity. |
| 2 - RESET | Active-low open-drain output | Drives low during reset condition; requires external pull-up (to VCC or another logic rail) to define high state - enables flexible voltage-level translation. |
| 3 - VCC | Supply input | Monitored power rail input; also powers internal circuitry - bypass capacitor (0.1 µF) required adjacent to pin to suppress high-frequency noise. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08 V threshold | ±3% tolerance over –40°C to +105°C ensures consistent reset point for 3.3 V systems - eliminates need for external resistor divider calibration. |
| Guaranteed 240 ms timeout | Fixed internal timer provides predictable reset hold time independent of external components - simplifies BOM and improves design reproducibility. |
| 15 µA ultra-low ICC | Enables direct integration into always-on subsystems (e.g., RTC backup domain) without measurable impact on battery life. |
| VCC ≥1 V RESET validity | Ensures reset signal remains asserted until supply collapses below functional logic threshold - prevents spurious release during deep undervoltage. |
| Power supply transient immunity | Immune to VCC glitches ≤20 µs at 100 mV overdrive - avoids false resets in EMI-prone industrial environments without added filtering. |
Applications
| Industrial PLC I/O Module | Smart Energy Meter |
|---|---|
Use Scenario: Monitors 3.3 V microcontroller supply in DIN-rail mounted programmable logic controller with 24 V DC input and isolated communication interfaces. IC Role / Device Role / Timing Role: Provides power-on reset and brown-out protection for ARM Cortex-M4 host MCU; holds RESET until 3.3 V rail stabilizes post-converter startup and remains asserted during 24 V line dips. Use Value: Prevents firmware lockup during factory floor voltage sags by guaranteeing 240 ms minimum reset pulse - meeting IEC 61000-4-11 immunity requirements. |
Use Scenario: Supervises 3.3 V supply powering metrology SoC and secure bootloader in Class 0.5S electricity meter with 10-year battery backup. IC Role / Device Role / Timing Role: Detects undervoltage on main rail and asserts RESET to halt measurement cycles and preserve flash write integrity during AC mains failure. Use Value: 15 µA quiescent current extends primary lithium battery life beyond 10 years; 3.08 V threshold aligns precisely with 3.3 V LDO dropout margin. |
| Portable Gas Detector | Automotive Body Control Module |
Use Scenario: Embedded in handheld combustible gas analyzer using AA batteries and low-power sensor interface ASIC. IC Role / Device Role / Timing Role: Resets MSP430 host MCU on battery insertion and during low-battery cutoff; integrates with fuel gauge ADC to initiate graceful shutdown. Use Value: Valid RESET output down to VCC = 1 V enables detection of end-of-life battery sag before system hang - improving field reliability and user safety. |
Use Scenario: Monitors 3.3 V domain powering CAN transceiver and LIN gateway in automotive door module operating across –40°C to +105°C. IC Role / Device Role / Timing Role: Generates clean reset pulse synchronized to 3.3 V rail ramp-up after ignition switch closure; rejects load-dump–induced transients on 12 V input. Use Value: 20 µs transient immunity prevents false resets during alternator load dump events; AEC-Q200–compatible SOT-23 package withstands automotive thermal cycling. |
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. 240 ms typical for LM809M3X-3.08/NOPB); higher 20 µA ICC. | Valid for cost-sensitive consumer electronics where shorter reset hold time is acceptable; not recommended for industrial systems requiring JEDEC-compliant timing. | Select MAX809TRD3+T only if board layout rework is prohibited and 140 ms minimum pulse satisfies µP datasheet tRST requirement. |
| TPS3808G30DBVR | 3.0 V threshold (not 3.08 V), adjustable delay option, 1.6 µA ICC, but requires external capacitor for timing - increases BOM count and footprint. | Better suited for ultra-low-power wearables; mismatched threshold reduces margin against 3.3 V rail tolerance stack-up in industrial designs. | Choose TPS3808G30DBVR only when sub-µA quiescent current is mandatory and threshold accuracy <±1% is unnecessary. |
Compared with MAX809TRD3+T and TPS3808G30DBVR, LM809M3X-3.08/NOPB delivers tighter threshold accuracy (±3% vs. ±4%), longer guaranteed reset hold time (140 ms min → 240 ms typical), and zero external components - making it optimal for industrial and automotive applications demanding deterministic, maintenance-free reset behavior.
Availability
LM809M3X-3.08/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, portable gas detectors, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM809M3X-3.08/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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.
The LM809 series belongs to TI's precision voltage supervisor product line, engineered specifically for deterministic power-on reset and brown-out protection in resource-constrained microprocessor systems - emphasizing accuracy, low power, and industrial-grade reliability.
FAQ
What is the exact reset threshold voltage of LM809M3X-3.08/NOPB and how does it vary with temperature?
The LM809M3X-3.08/NOPB has a factory-trimmed 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. Temperature coefficient is 30 ppm/°C - verified per TI SNVS052E datasheet Section 6.5.
Does LM809M3X-3.08/NOPB require an external pull-up resistor on the RESET pin?
Yes, LM809M3X-3.08/NOPB features an open-drain active-low RESET output and requires an external pull-up resistor to a valid logic rail (e.g., VCC or 3.3 V). TI recommends 10 kΩ–100 kΩ depending on bus capacitance and rise-time requirements - specified in Figure 7 and Section 7.3.1.1 of the LM809/LM810 datasheet.
Can LM809M3X-3.08/NOPB operate reliably below 1.2 V supply voltage?
LM809M3X-3.08/NOPB is fully specified down to VCC = 1.0 V per Recommended Operating Conditions (Section 6.3), and its RESET output remains valid (low) for VCC ≥1 V. Below 1 V, RESET transitions to high-impedance - so system design must ensure critical logic remains inactive or held in reset below that point.
What is the maximum VCC transient duration LM809M3X-3.08/NOPB can reject without asserting reset?
Per Figure 8 and Section 7.3.1.2, LM809M3X-3.08/NOPB rejects negative-going VCC transients ≤20 µs in duration when the overdrive is 100 mV below the 3.08 V threshold. This immunity is enhanced by placing a 0.1 µF ceramic capacitor directly at the VCC pin, as shown in Figure 10.
Is LM809M3X-3.08/NOPB pin-compatible with LM809M3-3.08/NOPB?
Yes, LM809M3X-3.08/NOPB and LM809M3-3.08/NOPB share identical SOT-23 (DBZ) package, pinout, electrical specifications, and thermal characteristics - differing only in tape-and-reel packaging (3000 vs. 1000 units per reel). Both use part marking "S5B" and have identical MSL-1 rating.
LM809M3X-3.08/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:
- 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/NOPB FAQ
1.How can I place an order for LM809M3X-3.08/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM809M3X-3.08/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-3.08/NOPB reliable?
The price and inventory of LM809M3X-3.08/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-3.08/NOPB is usually 5 days.
3.What payment methods are accepted for LM809M3X-3.08/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM809M3X-3.08/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM809M3X-3.08/NOPB?
LM809M3X-3.08/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM809M3X-3.08/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-3.08/NOPB?
For technical support, including LM809M3X-3.08/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM809M3X-3.08/NOPB requirements.
6.How does Aetrix verify that LM809M3X-3.08/NOPB is sourced from the original manufacturer or authorized distributors?
All LM809M3X-3.08/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-3.08/NOPB meets industry standards.
7.What is the process for return or replacement of LM809M3X-3.08/NOPB?
All LM809M3X-3.08/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM809M3X-3.08/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-3.08/NOPB part is unused and in its original packaging.
Return procedure for LM809M3X-3.08/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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