MAX809RTRG Equivalent & Substitute Parts

Part Overview

The MAX809RTRG is a single-channel power management supervisor IC manufactured by onsemi, designed for reset and power-on reset applications. This device features push-pull totem pole output with active-low reset control and a 2.63V voltage threshold. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The MAX809RTRG operates across an industrial temperature range of -40°C to 105°C and is packaged in SOT-23-3 (TO-236) surface mount configuration.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX809RTRG
Manufacturer	onsemi
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 to 105°C (TJ)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX809RTRG is determined by the following critical parameters:

Primary Matching Criteria:

Single-channel voltage monitoring capability
2.63V voltage threshold (±0.01V tolerance acceptable)
Push-pull totem pole output configuration
Active-low reset logic
SOT-23-3 package compatibility (TO-236-3, SC-59)
Surface mount technology

Secondary Compatibility Factors:

Reset timeout specification (140ms minimum preferred; 100ms to 140ms acceptable)
Operating temperature range (-40°C minimum; 85°C to 105°C maximum acceptable)
RoHS3 compliance and MSL Level 1 rating
Active product status preferred for long-term availability

Substitute parts are classified into two categories: direct equivalents (matching all primary criteria with identical package) and similar alternatives (matching functional parameters with package variations).

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Reset Timeout	Operating Temp Range	Package	Product Status	Inventory
MAX809RTRG	onsemi	2.63V	140ms Min	-40°C to 105°C	SOT-23-3	Obsolete	1216 Pcs
TPS3809L30DBVR	Texas Instruments	2.64V	120ms Min	-40°C to 85°C	SOT-23-3	Active	59300 Pcs
APX809-26SAG-7	Diodes Incorporated	2.63V	140ms Min	-40°C to 85°C	SOT-23-3	Not For New Designs	32910 Pcs
LM809M3-2.63/NOPB	Texas Instruments	2.63V	140ms Min	-40°C to 105°C	SOT-23-3	Active	18417 Pcs
LM809M3X-2.63/NOPB	Texas Instruments	2.63V	140ms Min	-40°C to 105°C	SOT-23-3	Active	6243 Pcs
MAX6326UR26+T	Analog Devices Inc./Maxim Integrated	2.63V	100ms Min	-40°C to 85°C	SOT-23-3	Active	5279 Pcs
MAX6381XR26D2+T	Analog Devices Inc./Maxim Integrated	2.63V	20ms Min	-40°C to 125°C	SC-70-3	Active	2898 Pcs
MAX809REUR+T	Analog Devices Inc./Maxim Integrated	2.63V	140ms Min	-40°C to 105°C	SOT-23-3	Active	66118 Pcs
MAX809REUR+T10	Analog Devices Inc./Maxim Integrated	2.63V	140ms Min	-40°C to 105°C	SOT-23-3	Active	1093 Pcs
MIC809RUY-TR	Microchip Technology	2.63V	140ms Min	-40°C to 85°C	SOT-23-3	Active	2903 Pcs
TCM809RVLB713	Microchip Technology	2.63V	140ms Min	-40°C to 125°C	SC-70-3	Active	10056 Pcs

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (SOT-23-3 Package, Identical Specifications):

MAX809REUR+T and MAX809REUR+T10 are direct functional equivalents manufactured by Analog Devices Inc./Maxim Integrated. Both maintain the 2.63V threshold, 140ms reset timeout, and -40°C to 105°C operating range. MAX809REUR+T offers significantly higher inventory (66118 Pcs) compared to MAX809REUR+T10 (1093 Pcs), making it the preferred choice for production continuity. Both parts are active products with ROHS3 compliance and MSL Level 1 rating.

LM809M3-2.63/NOPB and LM809M3X-2.63/NOPB from Texas Instruments provide identical electrical specifications to the MAX809RTRG with active product status. Both support the full -40°C to 105°C temperature range and 140ms reset timeout. LM809M3-2.63/NOPB has higher inventory availability (18417 Pcs) than LM809M3X-2.63/NOPB (6243 Pcs).

MIC809RUY-TR from Microchip Technology matches all primary electrical parameters with 2.63V threshold and 140ms reset timeout. Operating temperature is limited to -40°C to 85°C. Active product status and 2903 Pcs inventory support ongoing applications.

Tier 2 - Functional Equivalents with Minor Parameter Variations (SOT-23-3 Package):

TPS3809L30DBVR from Texas Instruments provides near-equivalent functionality with 2.64V threshold (0.01V variance) and 120ms reset timeout (20ms reduction). Operating temperature range is -40°C to 85°C. High inventory (59300 Pcs) and active status support high-volume production. Suitable for applications where reduced reset timeout is acceptable.

MAX6326UR26+T from Analog Devices Inc./Maxim Integrated maintains 2.63V threshold but specifies 100ms reset timeout (40ms reduction from MAX809RTRG). Operating temperature is -40°C to 85°C. Active status and 5279 Pcs inventory provide availability. Appropriate for designs tolerating shorter reset delay.

APX809-26SAG-7 from Diodes Incorporated matches 2.63V threshold and 140ms reset timeout specifications. Product status is "Not For New Designs," limiting suitability for new development. Operating temperature is -40°C to 85°C. Inventory of 32910 Pcs remains available for legacy support.

Tier 3 - Package Alternatives (SC-70-3 Package):

MAX6381XR26D2+T and TCM809RVLB713 use SC-70-3 package instead of SOT-23-3, requiring PCB layout modification. Both maintain 2.63V threshold and active product status. MAX6381XR26D2+T specifies 20ms reset timeout and -40°C to 125°C range. TCM809RVLB713 specifies 140ms reset timeout and -40°C to 125°C range. These alternatives are suitable only when package change is feasible.

Frequently Asked Questions (FAQ)

Q: Can TPS3809L30DBVR replace MAX809RTRG directly?

A: TPS3809L30DBVR is functionally compatible with one exception: reset timeout is 120ms minimum versus 140ms minimum on MAX809RTRG. If your application requires the full 140ms reset delay, verify that 120ms meets system requirements. Voltage threshold variance (2.64V vs 2.63V) is within acceptable tolerance. Package and output configuration are identical.

Q: What is the difference between MAX809REUR+T and MAX809REUR+T10?

A: Both parts are electrically identical with matching voltage threshold (2.63V), reset timeout (140ms), and operating temperature range (-40°C to 105°C). The designation difference reflects packaging or tape configuration variants. MAX809REUR+T has substantially higher inventory availability and is recommended for production use.

Q: Why are some substitutes marked "Not For New Designs"?

A: APX809-26SAG-7 carries "Not For New Designs" status, indicating the manufacturer has discontinued active development and support. While inventory remains available for legacy system support, active alternatives are preferred for new product development to ensure long-term supply chain stability and manufacturer technical support.

Q: Can I use SC-70-3 package parts as substitutes?

A: MAX6381XR26D2+T and TCM809RVLB713 are functionally equivalent but use SC-70-3 package instead of SOT-23-3. Direct PCB substitution is not possible without layout redesign. These alternatives are suitable only when package change is feasible and acceptable for your application.

Q: Which substitute offers the best long-term availability?

A: MAX809REUR+T from Analog Devices Inc./Maxim Integrated offers the highest inventory (66118 Pcs) combined with active product status, providing optimal long-term supply chain security. LM809M3-2.63/NOPB from Texas Instruments is a secondary choice with 18417 Pcs inventory and active status.

Q: Are all substitutes RoHS3 compliant?

A: All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory compliance profile of MAX809RTRG.

Q: What is the temperature range consideration for substitute selection?

A: MAX809RTRG operates to 105°C. Substitutes with 85°C maximum rating (TPS3809L30DBVR, APX809-26SAG-7, MAX6326UR26+T, MIC809RUY-TR) are suitable for applications not exceeding 85°C. For applications requiring full 105°C operation, select MAX809REUR+T, LM809M3-2.63/NOPB, or LM809M3X-2.63/NOPB.

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