LM809M3-2.63 Equivalent & Substitute Parts

Part Overview

The LM809M3-2.63 is a single-channel power supply supervisor IC manufactured by Texas Instruments, designed for push-pull, totem pole output reset functionality with a 2.63V threshold. This component operates across -40°C to 105°C and is packaged in SOT-23-3 (TO-236-3, SC-59). The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM809M3-2.63
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	2.63V
Output	Push-Pull, Totem Pole
Reset	Active Low
Reset Timeout	140ms Minimum
Operating Temperature	-40°C ~ 105°C (TA)
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SOT-23-3
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8542.39.0001

Substitute Part Grouping Explanation

Substitution eligibility for the LM809M3-2.63 is determined by the following critical parameters:

Core Functional Parameters:

Single-channel voltage monitoring
2.63V threshold voltage
Push-pull, totem pole output configuration
Active low reset signal
140ms minimum reset timeout

Physical & Environmental Parameters:

Surface mount packaging (SOT-23-3 or SC-70-3 compatible footprints)
Operating temperature range (-40°C minimum, 105°C or higher maximum)
Moisture sensitivity level 1 (unlimited)

Compliance Parameters:

RoHS3 compliance preferred for new designs
REACH unaffected status
ECCN EAR99 classification

Substitute parts are grouped into two categories: direct equivalents maintaining identical package and specifications, and parametric equivalents offering extended temperature ranges or alternative packaging while maintaining electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Timeout	Operating Temp (°C)	Package	Product Status	RoHS Status
LM809M3-2.63	Texas Instruments	2.63V	Push-Pull, Totem Pole	140ms Min	-40 ~ 105	SOT-23-3	Obsolete	Non-compliant
LM809M3-2.63/NOPB	Texas Instruments	2.63V	Push-Pull, Totem Pole	140ms Min	-40 ~ 105	SOT-23-3	Active	ROHS3 Compliant
LM809M3X-2.63/NOPB	Texas Instruments	2.63V	Push-Pull, Totem Pole	140ms Min	-40 ~ 105	SOT-23-3	Active	ROHS3 Compliant
ADM809RARTZ-REEL7	Analog Devices Inc.	2.63V	Push-Pull, Totem Pole	140ms Min	-40 ~ 125	SOT-23-3	Active	ROHS3 Compliant
APX809S-26SA-7	Diodes Incorporated	2.63V	Push-Pull, Totem Pole	140ms Min	-40 ~ 125	SOT-23-3	Active	ROHS3 Compliant
MAX809REXR+T	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	140ms Min	-40 ~ 125	SC-70-3	Active	ROHS3 Compliant
MAX809REXR+T10	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	140ms Min	-40 ~ 125	SC-70-3	Active	ROHS3 Compliant
MAX809RTRG	onsemi	2.63V	Push-Pull, Totem Pole	140ms Min	-40 ~ 105	SOT-23-3	Obsolete	ROHS3 Compliant
STM809RWX6F	STMicroelectronics	2.63V	Push-Pull, Totem Pole	140ms Min	-40 ~ 85	SOT-23-3	Active	ROHS3 Compliant
TCM809RVLB713	Microchip Technology	2.63V	Push-Pull, Totem Pole	140ms Min	-40 ~ 125	SC-70-3	Active	ROHS3 Compliant
TCM809RVNB713	Microchip Technology	2.63V	Push-Pull, Totem Pole	140ms Min	-40 ~ 125	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Same Package, Active Status): LM809M3-2.63/NOPB and LM809M3X-2.63/NOPB are the primary direct replacements from Texas Instruments. Both maintain SOT-23-3 packaging and identical electrical specifications while offering ROHS3 compliance and active product status. These are recommended for designs requiring minimal PCB modification.

Extended Temperature Range Alternatives: ADM809RARTZ-REEL7 (Analog Devices), APX809S-26SA-7 (Diodes Incorporated), and TCM809RVNB713 (Microchip Technology) provide identical SOT-23-3 packaging with extended operating temperature to -40°C ~ 125°C. These are suitable for applications requiring higher temperature margin while maintaining footprint compatibility.

Alternative Package Options: MAX809REXR+T, MAX809REXR+T10 (Maxim Integrated), and TCM809RVLB713 (Microchip Technology) use SC-70-3 packaging instead of SOT-23-3. These require PCB layout modification but offer extended temperature ranges and active product status. Selection depends on available board space and thermal requirements.

Temperature-Constrained Selection: STM809RWX6F (STMicroelectronics) maintains SOT-23-3 packaging and active status but operates only to -40°C ~ 85°C. This part is suitable only for applications with maximum ambient temperatures below 85°C.

Compliance Considerations: All recommended active substitutes are ROHS3 compliant and REACH unaffected. The original LM809M3-2.63 is RoHS non-compliant; migration to compliant alternatives is recommended for new production.

Frequently Asked Questions (FAQ)

Q: Can I use LM809M3-2.63/NOPB as a direct replacement for LM809M3-2.63? A: Yes. Both parts share identical electrical specifications, threshold voltage (2.63V), output configuration (push-pull, totem pole), and SOT-23-3 packaging. The primary difference is product status (active vs. obsolete) and RoHS compliance. No circuit modifications are required.

Q: What is the difference between SOT-23-3 and SC-70-3 packages? A: Both are three-pin surface mount packages with identical electrical functionality but different physical dimensions and PCB footprints. SOT-23-3 is larger than SC-70-3. Substitution between these packages requires PCB layout verification and potential redesign of the component placement area.

Q: Why do some substitutes have extended temperature ranges (-40°C ~ 125°C vs. -40°C ~ 105°C)? A: Extended temperature ranges reflect different manufacturer process capabilities and qualification standards. Parts rated to 125°C provide additional thermal margin and are suitable for high-temperature environments. Selection depends on your application's maximum operating temperature requirement.

Q: Are all substitute parts RoHS3 compliant? A: All recommended active substitutes are ROHS3 compliant. The original LM809M3-2.63 is RoHS non-compliant. For new designs and production, ROHS3-compliant alternatives are required to meet current environmental regulations.

Q: Can I substitute a part with a lower maximum operating temperature (e.g., STM809RWX6F at 85°C)? A: Only if your application's maximum ambient temperature does not exceed 85°C. Using a part with insufficient temperature rating risks component failure and system malfunction. Verify your thermal requirements before selecting temperature-constrained alternatives.

Q: What does "Active" vs. "Obsolete" product status mean? A: Active parts are currently manufactured and available from distributors. Obsolete parts are no longer produced and have limited inventory. For new designs, active parts are strongly preferred to ensure long-term supply availability.

Q: Are there any electrical differences between the substitute parts? A: No. All substitute parts maintain identical voltage threshold (2.63V), output type (push-pull, totem pole), reset polarity (active low), and reset timeout (140ms minimum). Electrical compatibility is guaranteed across all listed substitutes.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message