LM809M3X-2.63 Equivalent & Substitute Parts

Part Overview

The LM809M3X-2.63 is a single-channel power supply supervisor IC manufactured by Texas Instruments, designed for power-on reset and simple reset applications. This component monitors a single voltage threshold at 2.63V and provides push-pull, totem pole output with active-low reset functionality. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute parts maintain identical electrical and mechanical specifications while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM809M3X-2.63
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage Threshold	2.63V
Output Configuration	Push-Pull, Totem Pole
Reset Logic	Active Low
Reset Timeout	140ms Minimum
Operating Temperature Range	-40°C ~ 105°C (TA)
Mounting Type	Surface Mount
Package	TO-236-3, SC-59, SOT-23-3
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitution of the LM809M3X-2.63 is determined by strict equivalence across the following critical parameters:

Voltage threshold: 2.63V (exact match required)
Output configuration: Push-Pull, Totem Pole
Reset logic: Active Low
Reset timeout: 140ms Minimum
Number of voltages monitored: 1 channel
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Moisture sensitivity level: 1 (Unlimited)

All substitute parts listed maintain these specifications. Differences in operating temperature range, product status, and RoHS compliance are noted but do not prevent functional substitution. Parts are grouped by substitution classification: direct manufacturer equivalents, manufacturer-recommended substitutes, and parametric equivalents.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output	Reset Logic	Reset Timeout	Operating Temp (°C)	Package	Product Status	RoHS Status
LM809M3X-2.63	Texas Instruments	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40 ~ 105	SOT-23-3	Obsolete	RoHS Non-Compliant
LM809M3-2.63/NOPB	Texas Instruments	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40 ~ 105	SOT-23-3	Active	ROHS3 Compliant
LM809M3X-2.63/NOPB	Texas Instruments	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40 ~ 105	SOT-23-3	Active	ROHS3 Compliant
APX809S-26SA-7	Diodes Incorporated	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40 ~ 125	SOT-23-3	Active	ROHS3 Compliant
CAT809RTBI-GT3	onsemi	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40 ~ 85	SOT-23-3	Obsolete	ROHS3 Compliant
STM809RWX6F	STMicroelectronics	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40 ~ 85	SOT-23-3	Active	ROHS3 Compliant
TCM809RVNB713	Microchip Technology	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40 ~ 125	SOT-23-3	Active	ROHS3 Compliant
MAX809REUR+T	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40 ~ 105	SOT-23-3	Active	ROHS3 Compliant
MAX809REUR+T10	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40 ~ 105	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Texas Instruments Equivalents (Preferred for Pin-Compatible Replacement)

LM809M3-2.63/NOPB and LM809M3X-2.63/NOPB are direct equivalents from the original manufacturer. Both maintain identical electrical specifications and SOT-23-3 packaging. These parts are active products with ROHS3 compliance, making them the primary choice for direct substitution. LM809M3-2.63/NOPB offers higher inventory availability (18,417 units) compared to LM809M3X-2.63/NOPB (6,243 units).

Active Product Alternatives with Extended Temperature Range

APX809S-26SA-7 (Diodes Incorporated) and TCM809RVNB713 (Microchip Technology) both support extended operating temperature to -40°C ~ 125°C, providing additional thermal margin for demanding applications. Both are active products with ROHS3 compliance and identical electrical specifications.

Active Product Alternatives with Standard Temperature Range

STM809RWX6F (STMicroelectronics) and MAX809REUR+T (Analog Devices Inc./Maxim Integrated) maintain the standard operating temperature range of -40°C ~ 105°C and -40°C ~ 85°C respectively. Both are active products with ROHS3 compliance. MAX809REUR+T offers the highest inventory availability (66,118 units) among all substitutes.

Obsolete Parts to Avoid

CAT809RTBI-GT3 (onsemi) is classified as obsolete despite ROHS3 compliance. While functionally equivalent, its obsolete status makes it unsuitable for new designs or long-term production planning.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for LM809M3X-2.63?

A: Yes. All listed substitute parts maintain identical voltage threshold (2.63V), output configuration (push-pull, totem pole), reset logic (active low), and reset timeout (140ms minimum). All are packaged in SOT-23-3 and support surface mount assembly. Electrical substitution is valid across all parts.

Q: What is the difference between LM809M3-2.63/NOPB and LM809M3X-2.63/NOPB?

A: Both are Texas Instruments direct equivalents with identical electrical specifications and operating temperature range (-40°C ~ 105°C). The primary difference is product status and availability. LM809M3-2.63/NOPB is the active product with higher inventory (18,417 units). LM809M3X-2.63/NOPB is also active but with lower inventory (6,243 units). Both are ROHS3 compliant.

Q: Why should I avoid the CAT809RTBI-GT3?

A: While CAT809RTBI-GT3 is functionally equivalent and ROHS3 compliant, it is classified as obsolete. Obsolete parts present supply chain risk and are not recommended for new designs or ongoing production.

Q: Which substitute offers the best thermal performance?

A: APX809S-26SA-7 and TCM809RVNB713 both support extended operating temperature to -40°C ~ 125°C, compared to the original part's -40°C ~ 105°C range. These parts provide additional thermal margin for high-temperature applications.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original LM809M3X-2.63 is RoHS non-compliant. Substitution with any active part improves regulatory compliance.

Q: What is the highest inventory availability among substitutes?

A: MAX809REUR+T (Analog Devices Inc./Maxim Integrated) offers the highest inventory with 66,118 units in stock, followed by CAT809RTBI-GT3 (149,400 units, but obsolete status disqualifies it for new applications).

Q: Can I use MAX809REUR+T10 instead of MAX809REUR+T?

A: Yes. MAX809REUR+T10 is functionally identical to MAX809REUR+T with the same electrical specifications, operating temperature range, and ROHS3 compliance. The primary difference is lower inventory availability (1,093 units vs. 66,118 units).

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