LM809M3-3.08 Equivalent & Substitute Parts

Part Overview

The LM809M3-3.08 is a single-channel voltage supervisor IC manufactured by Texas Instruments, designed for power management and reset control applications. This device operates as a push-pull, totem pole output supervisor with an active-low reset function and a 3.08V threshold voltage. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and long-term system support.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM809M3-3.08
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	3.08V
Output Configuration	Push-Pull, Totem Pole
Reset Logic	Active Low
Reset Timeout	140ms Minimum
Operating Temperature Range	-40°C ~ 105°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the LM809M3-3.08 are qualified based on the following critical parameters that must match or exceed the original specification:

Voltage Threshold: 3.08V (exact match required)
Output Configuration: Push-Pull, Totem Pole (functional equivalence required)
Reset Logic: Active Low (functional equivalence required)
Reset Timeout: 140ms Minimum (must meet or exceed)
Package / Case: TO-236-3, SC-59, SOT-23-3 (pin-compatible)
Mounting Type: Surface Mount (PCB compatibility)
RoHS Status: ROHS3 Compliant (regulatory compliance)
Moisture Sensitivity Level: 1 (Unlimited) (handling and storage compatibility)

Substitute parts are categorized as follows:

Direct Manufacturer Equivalent: Parts with identical electrical specifications and the same base product line from the original manufacturer.

Parametric Equivalent: Parts from alternative manufacturers with matching electrical parameters, threshold voltage, output configuration, and package specifications.

Manufacturer Recommended Substitute: Parts recommended by alternative manufacturers as functional replacements, meeting all critical electrical and mechanical parameters.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Configuration	Reset Logic	Reset Timeout	Operating Temperature	Package	Product Status	Inventory (Pcs)
LM809M3-3.08	Texas Instruments	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Last Time Buy	10300
LM809M3-3.08/NOPB	Texas Instruments	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Active	19820
LM809M3X-3.08/NOPB	National Semiconductor	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Active	20100
APX809S-31SA-7	Diodes Incorporated	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C	SOT-23-3	Active	15200
MAX809TTRG	onsemi	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Obsolete	18700
TCM809TVNB713	Microchip Technology	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C	SOT-23-3	Active	21725
MAX809TEUR+T	Analog Devices Inc./Maxim Integrated	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Active	125400
MAX809TEUR+T10	Analog Devices Inc./Maxim Integrated	3.08V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Active	699

Engineering Selection Recommendations

Primary Recommendation: LM809M3-3.08/NOPB (Texas Instruments)

This part is the direct manufacturer equivalent with Active product status and highest inventory availability (19820 units). It maintains identical electrical specifications and package compatibility with the original LM809M3-3.08, ensuring seamless integration into existing designs.

Secondary Recommendations:

TCM809TVNB713 (Microchip Technology) offers the highest inventory level (21725 units) and extended operating temperature range (-40°C ~ 125°C), providing thermal margin beyond the original specification. Active product status ensures long-term availability.

MAX809TEUR+T (Analog Devices Inc./Maxim Integrated) provides the largest inventory reserve (125400 units) with Active product status, offering exceptional supply chain security for high-volume production requirements.

APX809S-31SA-7 (Diodes Incorporated) delivers extended operating temperature range (-40°C ~ 125°C) with Active product status and substantial inventory (15200 units), suitable for applications requiring enhanced thermal performance.

Not Recommended: MAX809TTRG (onsemi) carries Obsolete product status, indicating discontinued production and limited future availability despite current inventory levels.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and identical SOT-23-3 package specifications, ensuring regulatory compliance and PCB assembly compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the LM809M3-3.08?

A: Yes, all listed substitute parts meet the critical electrical parameters: 3.08V threshold voltage, push-pull totem pole output, active-low reset logic, and 140ms minimum reset timeout. All are packaged in SOT-23-3 and are pin-compatible. Verify your specific application requirements for operating temperature range, as some substitutes offer extended temperature ratings.

Q: What is the difference between the LM809M3-3.08 and LM809M3-3.08/NOPB?

A: The /NOPB designation indicates "No Plumbum" (lead-free) compliance. Both parts are electrically and mechanically identical. The /NOPB variant is the current production version with Active status, while the original LM809M3-3.08 is in Last Time Buy status.

Q: Why do some substitute parts have extended operating temperature ranges (-40°C ~ 125°C vs. -40°C ~ 105°C)?

A: Extended temperature ranges indicate the device is qualified for operation at higher ambient temperatures. These parts can be used as direct substitutes in applications requiring the original -40°C ~ 105°C range, as they exceed the specification. Use extended-range parts only if your application requires the additional thermal margin.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts carry ROHS3 compliance certification, meeting regulatory requirements for hazardous substance restrictions.

Q: What does MSL Level 1 mean for moisture sensitivity?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control requirements. These components do not require special dry-pack storage or baking procedures before assembly, simplifying inventory management and reducing handling costs.

Q: Which substitute offers the best supply chain security?

A: MAX809TEUR+T (Analog Devices Inc./Maxim Integrated) provides the largest inventory reserve at 125400 units with Active product status, offering maximum supply continuity for high-volume production programs.

Q: Can I mix different substitute parts in the same production run?

A: Yes, all substitute parts are functionally equivalent and pin-compatible. However, standard engineering practice recommends using a single qualified part number per production lot to maintain consistency in testing, documentation, and traceability.

Q: What should I do about the MAX809TTRG (onsemi) part listed as Obsolete?

A: Avoid new designs using MAX809TTRG. While current inventory exists, onsemi has discontinued production. Select from Active-status alternatives to ensure long-term supply availability and design sustainability.

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