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Texas Instruments LM8365BALMFX45
- Part No.:
- LM8365BALMFX45
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM8365BALMFX45.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,556
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Product details
Overview
LM8365BALMFX45 from Texas Instruments is a micropower undervoltage-sensing circuit with active-low open-drain reset output, 4.5 V detection threshold (±2.5%), programmable delay via external capacitor (130 ms typical with 0.1 μF), and 0.7 μA quiescent current at VIN = 4.34 V. It monitors supply voltage in battery-powered microprocessor systems to prevent erratic operation during brownout.
For engineers reviewing the LM8365BALMFX45 datasheet, LM8365BALMFX45 pinout, LM8365BALMFX45 application, or LM8365BALMFX45 equivalent, this page delivers verified specifications, SOT-23-5 pin mapping, real-world timing behavior, and validated alternative options for low-power reset supervision.
Technical Context
The LM8365BALMFX45 integrates a precision voltage reference, comparator with built-in hysteresis (0.225 V typical), and internal delay resistor (1 MΩ typical) to generate time-delayed reset assertion. Its CD pin discharges fully on undervoltage detection and charges through RD to 0.675 × VIN to trigger reset release.
It operates across 1 V to 6 V input range, supports reset assertion down to 1 V, and features ±100 ppm/°C threshold temperature coefficient. The open-drain RESET output sinks up to 2.5 mA at 0.5 V with 470 kΩ pull-up to VIN or 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Threshold | 4.5 V ±2.5% - precisely trimmed for reliable 4.5 V supply monitoring with hysteresis of 0.225 V typical |
| Quiescent Current | 0.7 μA at VIN = 4.34 V - enables multi-year battery life in portable systems |
| Output Type | Active-low open-drain - requires external pull-up; compatible with 1.8 V to 5 V logic domains |
| Delay Programmability | Capacitor-controlled (CD pin); 130 ms typical with 0.1 μF - enables system-specific power-up sequencing |
| Operating Voltage Range | 1 V to 6 V - supports single-cell Li-ion, alkaline, and regulated 3.3 V/5 V rails |
| Temperature Range | −40 °C to +85 °C - qualified for industrial and portable consumer environments |
| Package | SOT-23-5 (DBV) - 2.90 mm × 1.60 mm footprint; surface-mount compatible with standard reflow |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 1.45 mm max height, lead pitch 0.95 mm, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain output | Active-low reset signal; must be pulled up externally (e.g., 470 kΩ to VIN); sinks ≥1 mA at 0.5 V |
| 2 - INPUT | Voltage sense input | Monitors supply rail (VIN); threshold triggers at 4.5 V falling edge; functional down to 1 V |
| 3 - GND | Ground reference | Analog and digital ground return; connects to system common; required for accurate threshold tracking |
| 4 - N/C | No connection | Internally unconnected; no PCB trace or pad required; leave floating per TI recommendation |
| 5 - CD | Delay capacitor terminal | Charges/discharges external capacitor to set reset timeout; internal 1 MΩ pull-up enables 130 ms delay with 0.1 μF |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 0.7 μA at 4.34 V - extends shelf life and runtime in coin-cell–powered devices |
| Precision threshold with hysteresis | 4.5 V ±2.5%, 0.225 V hysteresis - prevents chatter during slow-rising/falling supply transitions |
| Programmable reset timeout | Externally set via CD capacitor - supports 130 ms (0.1 μF) to 1.2 s (1 μF) delays without firmware |
| Wide input voltage range | 1 V to 6 V operation - eliminates need for external voltage dividers or regulators in diverse supply architectures |
| Open-drain output compatibility | Supports mixed-voltage systems - interfaces directly with 1.8 V, 3.3 V, or 5 V logic via appropriate pull-up |
Applications
| Portable Power Management | Microcontroller Reset Supervision |
|---|---|
|
Use Scenario: Monitoring single-cell Li-ion (2.7–4.2 V) or alkaline (0.9–1.5 V × 3) battery packs in handheld medical meters. IC Role / Device Role / Timing Role: Undervoltage detector asserting active-low RESET to halt MCU execution before brownout-induced corruption. Use Value: Prevents data loss and flash memory corruption by ensuring clean reset before supply drops below 4.5 V threshold. |
Use Scenario: Ensuring deterministic boot sequence in ARM Cortex-M0+ based IoT sensor nodes powered by buck-boost converters. IC Role / Device Role / Timing Role: Delayed reset generator holding MCU in reset until regulated 3.3 V rail stabilizes post-power-on. Use Value: 130 ms programmable delay (with 0.1 μF CD cap) matches typical DC/DC startup time, eliminating need for software timers. |
| Battery Backup Switchover | Power-Fail Indicator |
|
Use Scenario: Detecting main supply failure in smart meter designs with supercapacitor backup, triggering switchover before RTC/data loss. IC Role / Device Role / Timing Role: High-accuracy 4.5 V threshold comparator enabling precise transition point between primary and backup sources. Use Value: ±2.5% threshold tolerance ensures consistent switchover across temperature and unit-to-unit variation. |
Use Scenario: Providing early warning of AC adapter removal in portable test equipment with internal LiPo battery. IC Role / Device Role / Timing Role: Open-drain RESET output wired as power-fail flag to host controller GPIO, asserted when VIN falls below 4.5 V. Use Value: 0.7 μA quiescent current minimizes standby drain on backup battery during extended off-line periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar undervoltage-sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EC27DBVR | 2.7 V fixed threshold; no programmable delay; 0.5 μA IQ; SOT-23-3 | Lacks CD pin and delay capability; suited only for immediate-reset use cases | Select when minimal BOM count and zero-delay reset are required; not suitable for sequenced power-up. |
| MAX809SEUR+T | 4.63 V threshold (±2.5%); fixed 240 ms delay; 12 μA IQ; SOT-23-3 | Higher quiescent current; non-programmable delay; no CD pin for customization | Choose for drop-in replacement where 4.63 V threshold and fixed timing meet requirements; higher IQ limits battery life. |
Compared with TLV803EC27DBVR and MAX809SEUR+T, the LM8365BALMFX45 uniquely combines 4.5 V precision threshold, ultra-low 0.7 μA current, and user-programmable delay-enabling optimized power sequencing in space-constrained, battery-sensitive designs.
Availability
LM8365BALMFX45 is available at Aetrix Electronics and suitable for portable electronics, microprocessor reset supervision, and battery backup detection requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for LM8365BALMFX45 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 high-reliability ICs.
The LM8365 series was designed specifically for micropower undervoltage sensing in battery-critical systems-emphasizing sub-1 μA operation, precision thresholds, and flexible reset timing without MCU intervention.
FAQ
What is the exact detection threshold voltage of the LM8365BALMFX45?
The LM8365BALMFX45 has a nominal detection threshold of 4.5 V with ±2.5% accuracy over temperature and process variation. This corresponds to the "45" suffix in the part number and is confirmed in the Electrical Characteristics table (VDET− = 4.388 V to 4.613 V at TA = 25°C). The device also provides 0.225 V typical hysteresis to prevent oscillation near the threshold.
How does the CD pin function in the LM8365BALMFX45?
The CD pin on the LM8365BALMFX45 serves as the delay capacitor terminal. During undervoltage detection, it discharges fully to 0 V. When VIN rises above the hysteresis-adjusted threshold (VDET+), an internal 1 MΩ pull-up resistor charges the external capacitor until it reaches ~0.675 × VIN, at which point the RESET output releases. A 0.1 μF capacitor yields ~130 ms delay.
Is the LM8365BALMFX45 pin-compatible with other members of the LM8365 family?
Yes - all LM8365 variants (e.g., LM8365BALMF27/NOPB, LM8365BALMFX45/NOPB) share identical SOT-23-5 (DBV) pinout and footprint. Pin 1 is RESET, Pin 2 is INPUT, Pin 3 is GND, Pin 4 is N/C, and Pin 5 is CD. Only the detection threshold (27 vs. 45 suffix) and ordering packaging differ between variants.
What is the minimum operating voltage for the LM8365BALMFX45?
The LM8365BALMFX45 functions down to 1 V input supply, as specified in Recommended Operating Conditions. It maintains valid reset assertion and CD pin control even at 1 V, enabling use with deeply discharged batteries or low-voltage energy harvesting sources - a key differentiator versus many competing supervisors.
Does the LM8365BALMFX45 require an external pull-up resistor on the RESET pin?
Yes - the LM8365BALMFX45 features an open-drain RESET output and requires an external pull-up resistor (e.g., 470 kΩ to VIN or 5 V) to establish a defined high state. TI's typical application circuits specify this resistor to ensure proper logic-level compatibility and timing behavior, especially when interfacing with 1.8 V, 3.3 V, or 5 V microcontrollers.
LM8365BALMFX45 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.5V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM8365BALMFX45 FAQ
1.How can I place an order for LM8365BALMFX45 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM8365BALMFX45 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 LM8365BALMFX45 reliable?
The price and inventory of LM8365BALMFX45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM8365BALMFX45 is usually 5 days.
3.What payment methods are accepted for LM8365BALMFX45?
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4.How is shipping managed for LM8365BALMFX45?
LM8365BALMFX45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM8365BALMFX45 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 LM8365BALMFX45?
For technical support, including LM8365BALMFX45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM8365BALMFX45 requirements.
6.How does Aetrix verify that LM8365BALMFX45 is sourced from the original manufacturer or authorized distributors?
All LM8365BALMFX45 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 LM8365BALMFX45 meets industry standards.
7.What is the process for return or replacement of LM8365BALMFX45?
All LM8365BALMFX45 units undergo pre-shipment inspection (PSI). If there is an issue with LM8365BALMFX45, 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 LM8365BALMFX45 part is unused and in its original packaging.
Return procedure for LM8365BALMFX45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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