MAX809RTR Equivalent & Substitute Parts

Part Overview

The MAX809RTR is a single-channel power management supervisor IC manufactured by onsemi, designed for reset and power-on reset applications. It features push-pull totem pole output with active low reset, a 2.63V voltage threshold, and 140ms minimum reset timeout. The device is housed in a SOT-23-3 (TO-236) surface mount package.

The MAX809RTR is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support long-term product support where the original part is no longer in production.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Part Number	MAX809RTR
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 (TJ)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MAX809RTR is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage threshold: 2.63V
Output configuration: Push-Pull, Totem Pole
Reset logic: Active Low
Reset timeout: 140ms minimum
Number of voltages monitored: 1 channel
Mounting type: Surface Mount

Package Compatibility: Substitutes are grouped into two categories based on package type:

SOT-23-3 (TO-236) package: Direct pin-compatible substitutes
SC-70-3 (SOT-323) package: Functionally equivalent but requires PCB layout modification

Product Status Consideration: Active production parts are preferred over obsolete parts for new designs and long-term availability. However, obsolete parts with identical electrical specifications remain functionally equivalent.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output	Reset Logic	Reset Timeout	Operating Temp (TA/TJ)	Package	Product Status	RoHS Status
MAX809RTR	onsemi	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C (TJ)	SOT-23-3	Obsolete	RoHS non-compliant
MAX809RTRG	onsemi	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C (TJ)	SOT-23-3	Obsolete	ROHS3 Compliant
MAX809REUR+T	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C (TA)	SOT-23-3	Active	ROHS3 Compliant
MAX809REUR+T10	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C (TA)	SOT-23-3	Active	ROHS3 Compliant
LM809M3-2.63/NOPB	Texas Instruments	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C (TA)	SOT-23-3	Active	ROHS3 Compliant
LM809M3X-2.63/NOPB	Texas Instruments	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C (TA)	SOT-23-3	Active	ROHS3 Compliant
MIC809RUY-TR	Microchip Technology	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C (TA)	SOT-23-3	Active	ROHS3 Compliant
STM809RWX6F	STMicroelectronics	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C (TA)	SOT-23-3	Active	ROHS3 Compliant
MAX6326UR26+T	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	Active Low	100ms Min	-40°C ~ 85°C (TA)	SOT-23-3	Active	ROHS3 Compliant
MAX6381XR26D2+T	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	Active Low	20ms Min	-40°C ~ 125°C (TA)	SC-70-3	Active	ROHS3 Compliant
TCM809RVLB713	Microchip Technology	2.63V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C (TA)	SC-70-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Pin-Compatible Substitutes (SOT-23-3 Package):

For applications requiring identical PCB footprint compatibility, the following active production parts are recommended:

MAX809REUR+T and MAX809REUR+T10 (Analog Devices Inc./Maxim Integrated): Identical electrical specifications, ROHS3 compliant, highest inventory availability (66,118 units).
LM809M3-2.63/NOPB and LM809M3X-2.63/NOPB (Texas Instruments): Identical electrical specifications, ROHS3 compliant, active production status.
MIC809RUY-TR (Microchip Technology): Identical electrical specifications, ROHS3 compliant. Operating temperature range limited to -40°C ~ 85°C.
STM809RWX6F (STMicroelectronics): Identical electrical specifications, ROHS3 compliant. Operating temperature range limited to -40°C ~ 85°C.

Functional Equivalents with Package Modification (SC-70-3 Package):

For designs where package size reduction is acceptable and PCB layout can be modified:

MAX6381XR26D2+T (Analog Devices Inc./Maxim Integrated): Extended operating temperature range (-40°C ~ 125°C), shorter reset timeout (20ms minimum), ROHS3 compliant. Requires SC-70-3 footprint.
TCM809RVLB713 (Microchip Technology): Extended operating temperature range (-40°C ~ 125°C), identical reset timeout (140ms minimum), ROHS3 compliant. Requires SC-70-3 footprint.

Compliance Consideration:

The original MAX809RTR is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, supporting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX809REUR+T be used as a direct replacement for MAX809RTR?

A: Yes. MAX809REUR+T is electrically and functionally identical to MAX809RTR. Both devices feature 2.63V voltage threshold, push-pull totem pole output, active low reset, and 140ms minimum reset timeout. The primary difference is product status: MAX809REUR+T is in active production while MAX809RTR is obsolete. Pin configuration and package footprint (SOT-23-3) are identical, requiring no PCB modifications.

Q: What is the difference between MAX6326UR26+T and MAX809RTR?

A: MAX6326UR26+T shares the same voltage threshold (2.63V), output configuration (push-pull totem pole), and reset logic (active low). The key difference is reset timeout: MAX6326UR26+T specifies 100ms minimum versus 140ms minimum for MAX809RTR. This shorter timeout may affect system behavior during power-on sequences. Operating temperature range is also reduced to -40°C ~ 85°C. Verify timing requirements before substitution.

Q: Why would I choose a SC-70-3 package substitute like MAX6381XR26D2+T?

A: SC-70-3 package substitutes offer extended operating temperature ranges (up to -125°C) and smaller physical footprint compared to SOT-23-3. However, they require PCB layout modification due to different pin spacing and package dimensions. Choose SC-70-3 variants only when space constraints justify the redesign effort or when extended temperature operation is required.

Q: Are there operating temperature differences I should consider?

A: Yes. Most SOT-23-3 substitutes operate at -40°C ~ 105°C or -40°C ~ 85°C. SC-70-3 variants (MAX6381XR26D2+T and TCM809RVLB713) extend to -40°C ~ 125°C. If your application requires operation above 105°C, SC-70-3 options are necessary. If limited to -40°C ~ 85°C, all active production parts are suitable.

Q: What does ROHS3 compliance mean for my design?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original MAX809RTR is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, supporting modern manufacturing and environmental regulations. If your supply chain or end-market requires RoHS compliance, substitutes are mandatory.

Q: Can I use MIC809RUY-TR or STM809RWX6F if my application operates above 85°C?

A: No. Both MIC809RUY-TR and STM809RWX6F are rated for -40°C ~ 85°C maximum operating temperature. If your application requires operation between 85°C and 105°C, use MAX809REUR+T, LM809M3-2.63/NOPB, or LM809M3X-2.63/NOPB, which are rated to 105°C. For operation above 105°C, select SC-70-3 package variants rated to 125°C.

Q: What inventory considerations should I factor into my selection?

A: MAX809REUR+T has the highest inventory availability (66,118 units), followed by STM809RWX6F (26,100 units) and LM809M3-2.63/NOPB (18,417 units). If supply chain continuity is critical, prioritize parts with higher inventory levels. Obsolete parts like MAX809RTR and MAX809RTRG have limited remaining stock (4,462 and 1,216 units respectively) and should not be selected for new designs.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message