LM809M3X-4.63 Equivalent & Substitute Parts

Part Overview

The LM809M3X-4.63 is a single-channel power supply supervisor IC manufactured by Texas Instruments, designed for push-pull, totem pole output reset control in SOT-23-3 surface mount packaging. This part monitors a single voltage threshold at 4.63V and provides active-low reset output with a 140ms minimum timeout. The LM809M3X-4.63 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM809M3X-4.63
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage Threshold	4.63V
Output Configuration	Push-Pull, Totem Pole
Reset Logic	Active Low
Reset Timeout	140ms Minimum
Operating Temperature Range	-40°C to 105°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS Non-Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM809M3X-4.63 are qualified based on the following critical parameters that must match or exceed the original specification:

Mandatory Matching Parameters:

Single voltage monitoring channel
4.63V threshold voltage
Push-pull, totem pole output configuration
Active-low reset logic
140ms minimum reset timeout
SOT-23-3 surface mount package
Moisture Sensitivity Level 1 (Unlimited)

Allowable Variations:

Operating temperature range may extend beyond -40°C to 105°C (higher upper limits are acceptable)
Product status may differ (active parts preferred over obsolete)
RoHS compliance status may differ (ROHS3 compliant parts are preferred)
Packaging format (Tape & Reel, Cut Tape, or standard) does not affect electrical compatibility

Substitute parts are grouped into two categories: direct manufacturer equivalents from Texas Instruments and cross-manufacturer alternatives from Analog Devices Inc., Diodes Incorporated, onsemi, STMicroelectronics, and Microchip Technology.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Logic	Reset Timeout	Temp Range (TA)	Package	Product Status	RoHS Status
LM809M3X-4.63	Texas Instruments	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C to 105°C	SOT-23-3	Obsolete	RoHS Non-Compliant
LM809M3X-4.63/NOPB	Texas Instruments	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C to 105°C	SOT-23-3	Active	ROHS3 Compliant
LM809M3-4.63/NOPB	Texas Instruments	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C to 105°C	SOT-23-3	Active	ROHS3 Compliant
MAX809LEUR+T	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C to 105°C	SOT-23-3	Active	ROHS3 Compliant
MAX809LEUR+T10	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C to 105°C	SOT-23-3	Active	ROHS3 Compliant
ADM809LARTZ-REEL	Analog Devices Inc.	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C to 125°C	SOT-23-3	Active	ROHS3 Compliant
ADM809LARTZ-REEL7	Analog Devices Inc.	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C to 125°C	SOT-23-3	Active	ROHS3 Compliant
APX809S-46SA-7	Diodes Incorporated	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C to 125°C	SOT-23-3	Active	ROHS3 Compliant
CAT809LTBI-GT3	onsemi	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C to 85°C	SOT-23-3	Obsolete	ROHS3 Compliant
STM809LWX6F	STMicroelectronics	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C to 85°C	SOT-23-3	Active	ROHS3 Compliant
TCM809LVNB713	Microchip Technology	4.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C to 125°C	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Texas Instruments Base Product): LM809M3X-4.63/NOPB and LM809M3-4.63/NOPB are direct equivalents from the original manufacturer. Both are active products with ROHS3 compliance, making them the preferred choice for new designs. The difference between these two parts is packaging format only (Tape & Reel versus Cut Tape & Digi-Reel), with no electrical differences.

Secondary Substitutes (Extended Temperature Range): ADM809LARTZ-REEL, ADM809LARTZ-REEL7, APX809S-46SA-7, and TCM809LVNB713 all support extended operating temperature ranges to 125°C, exceeding the original specification. These parts are active products with ROHS3 compliance and are suitable for applications requiring higher temperature operation.

Tertiary Substitutes (Limited Temperature Range): CAT809LTBI-GT3 and STM809LWX6F support reduced upper operating temperature limits of 85°C. CAT809LTBI-GT3 is obsolete; STM809LWX6F is active. These parts are suitable only for applications with maximum operating temperatures not exceeding 85°C.

Highest Inventory Availability: MAX809LEUR+T (26,997 pcs) and TCM809LVNB713 (17,200 pcs) offer the largest available stock quantities.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the LM809M3X-4.63?

A: Yes, all listed substitute parts meet the mandatory electrical parameters: 4.63V threshold, single-channel monitoring, push-pull totem pole output, active-low reset logic, and 140ms minimum reset timeout. All are packaged in SOT-23-3 surface mount format with identical pinout and functionality. Physical board layout and footprint compatibility are identical.

Q: What is the difference between LM809M3X-4.63/NOPB and LM809M3-4.63/NOPB?

A: Both parts are electrically identical with the same voltage threshold, output configuration, and operating temperature range. The difference is packaging format: LM809M3X-4.63/NOPB is supplied in Tape & Reel format, while LM809M3-4.63/NOPB is supplied in Cut Tape & Digi-Reel format. Selection depends on your assembly process requirements.

Q: Why do some substitute parts have a higher operating temperature range?

A: ADM809LARTZ-REEL, ADM809LARTZ-REEL7, APX809S-46SA-7, and TCM809LVNB713 are rated to -40°C to 125°C, compared to the original -40°C to 105°C. This extended range does not affect compatibility; these parts will function correctly in applications limited to 105°C or lower.

Q: Are there any compliance differences I should consider?

A: The original LM809M3X-4.63 is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, meeting current environmental regulations. If your application requires RoHS non-compliant components, only the original part meets this requirement.

Q: What is the significance of the /NOPB designation?

A: The /NOPB suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS compliance. Parts without this designation may contain lead.

Q: Can I mix different manufacturers' parts in the same design?

A: Yes. All substitute parts meet identical electrical specifications for voltage threshold, output type, reset logic, and timeout. Cross-manufacturer substitution is electrically valid. However, verify that your procurement and quality assurance processes support multiple manufacturer sources if required.

Q: Which substitute should I choose for new production designs?

A: For new designs, select from active products with ROHS3 compliance: LM809M3X-4.63/NOPB, LM809M3-4.63/NOPB, MAX809LEUR+T, ADM809LARTZ-REEL7, APX809S-46SA-7, STM809LWX6F, or TCM809LVNB713. Avoid obsolete parts (CAT809LTBI-GT3) unless required for legacy system compatibility.

Q: Does operating temperature range affect my selection?

A: Select based on your application's maximum operating temperature. If your system operates at or below 85°C, CAT809LTBI-GT3 or STM809LWX6F are suitable. For applications up to 105°C, use LM809M3X-4.63/NOPB, LM809M3-4.63/NOPB, or MAX809LEUR+T. For applications requiring operation to 125°C, use ADM809LARTZ-REEL, ADM809LARTZ-REEL7, APX809S-46SA-7, or TCM809LVNB713.

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