APX809-26SAG-7 Equivalent & Substitute Parts

Part Overview

The APX809-26SAG-7 is a single-channel power supply supervisor IC manufactured by Diodes Incorporated, designed for power-on reset and simple reset applications. This device monitors a 2.63V threshold voltage and provides push-pull, totem pole output with active-low reset functionality. The part is classified as Not For New Designs, indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where this supervisor function is required.

Key Parameters

Parameter	Value
Manufacturer Part Number	APX809-26SAG-7
Manufacturer	Diodes Incorporated
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 ~ 85°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the APX809-26SAG-7 is determined by strict equivalence across the following critical parameters:

Voltage threshold: 2.63V (±tolerance)
Output configuration: Push-Pull, Totem Pole
Reset polarity: Active Low
Reset timeout: 140ms minimum
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Compliance: ROHS3 Compliant, REACH Unaffected

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents (Diodes Incorporated): Parts from the same manufacturer with identical electrical specifications and active product status, suitable for direct replacement.

Parametric Equivalents (Cross-Manufacturer): Parts from alternative manufacturers meeting all critical electrical and mechanical parameters, with variations in operating temperature range or reset timeout that remain within acceptable application margins.

Manufacturer-Recommended Alternatives: Parts recommended by original equipment manufacturers or alternative suppliers, offering equivalent functionality with potential differences in product status or packaging format.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Timeout	Operating Temp	Package	Product Status
APX809-26SAG-7	Diodes Incorporated	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs
APX809S-26SA-7	Diodes Incorporated	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 125°C	SOT-23-3	Active
APX809-26SRG-7	Diodes Incorporated	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT23R	Active
PT7M7809RTEX	Diodes Incorporated	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-23-3	Last Time Buy
ADM809RARTZ-REEL7	Analog Devices Inc.	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 125°C	SOT-23-3	Active
MAX6326UR26+T	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	100ms Min	-40°C ~ 85°C	SOT-23-3	Active
MAX809REUR+T	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 105°C	SOT-23-3	Active
MAX809REUR+T10	Analog Devices Inc./Maxim Integrated	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 105°C	SOT-23-3	Active
MAX809RTRG	onsemi	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 105°C	SOT-23-3	Obsolete
MCP809T-270I/TT	Microchip Technology	2.625V	Push-Pull, Totem Pole	150ms Min	-40°C ~ 85°C	SOT-23-3	Active
CAT809RTBI-GT3	onsemi	2.63V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete

Engineering Selection Recommendations

For Active Production and New Designs:

APX809S-26SA-7 (Diodes Incorporated) is the primary recommended substitute. This part maintains identical electrical specifications to the APX809-26SAG-7 while offering extended operating temperature range (-40°C ~ 125°C) and active product status, ensuring long-term availability and supply chain continuity.

ADM809RARTZ-REEL7 (Analog Devices Inc.) provides an alternative from an established manufacturer with active product status, equivalent electrical performance, and extended temperature range. This part is suitable for applications requiring cross-manufacturer qualification.

MAX809REUR+T (Analog Devices Inc./Maxim Integrated) offers equivalent functionality with active product status and extended operating temperature range (-40°C ~ 105°C). This part is appropriate for designs where Maxim Integrated components are already qualified.

For Legacy System Support:

PT7M7809RTEX (Diodes Incorporated) maintains exact electrical equivalence but carries Last Time Buy status, making it suitable only for short-term production runs or maintenance applications where supply is still available.

CAT809RTBI-GT3 (onsemi) and MAX809RTRG (onsemi) are obsolete parts with limited inventory. These should be used only when existing stock is available and no alternative is feasible.

Voltage Threshold Consideration:

MCP809T-270I/TT (Microchip Technology) operates at 2.625V threshold, which is within typical tolerance of the 2.63V specification. This part is suitable for applications where minor threshold variation is acceptable and Microchip components are preferred.

MAX6326UR26+T (Analog Devices Inc./Maxim Integrated) features a reduced reset timeout of 100ms minimum compared to the 140ms specification. This part is suitable only for applications where faster reset response is acceptable or beneficial.

Frequently Asked Questions (FAQ)

Q: Can APX809S-26SA-7 be used as a direct replacement for APX809-26SAG-7?

A: Yes. APX809S-26SA-7 is a direct substitute with identical voltage threshold (2.63V), output configuration (push-pull, totem pole), reset polarity (active low), and reset timeout (140ms minimum). The extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C) provides additional margin. Both parts use SOT-23-3 packaging and are ROHS3 compliant.

Q: What is the difference between APX809-26SRG-7 and APX809-26SAG-7?

A: Both parts are manufactured by Diodes Incorporated with identical electrical specifications. The primary difference is the supplier device package designation: APX809-26SAG-7 uses standard SOT-23-3, while APX809-26SRG-7 uses SOT23R packaging. Electrical performance and pinout are equivalent. APX809-26SRG-7 is active, while APX809-26SAG-7 is not for new designs.

Q: Are cross-manufacturer substitutes (Analog Devices, Microchip, onsemi) pin-compatible?

A: Yes. All substitute parts listed maintain SOT-23-3 (TO-236-3, SC-59) packaging with identical pinout. Pin compatibility is guaranteed across all listed alternatives. Electrical specifications remain equivalent within the parameters provided.

Q: What is the significance of "Last Time Buy" status for PT7M7809RTEX?

A: Last Time Buy status indicates the manufacturer has announced end-of-life for this part. Existing inventory may be available for purchase, but no future production is planned. This part is suitable for immediate production needs but not for long-term supply planning. APX809S-26SA-7 is recommended for ongoing applications.

Q: Can MAX6326UR26+T be used if reset timeout is critical?

A: MAX6326UR26+T features a 100ms minimum reset timeout compared to the 140ms specification of APX809-26SAG-7. This part is suitable only if the application can tolerate faster reset response. For applications requiring the full 140ms timeout, use APX809S-26SA-7, ADM809RARTZ-REEL7, or MAX809REUR+T.

Q: Why are some substitute parts marked as Obsolete?

A: CAT809RTBI-GT3 and MAX809RTRG are obsolete parts with no ongoing production. These parts may have limited inventory available but should not be selected for new designs or long-term production. Active alternatives such as APX809S-26SA-7 or ADM809RARTZ-REEL7 are recommended.

Q: Are all substitute parts ROHS3 compliant and REACH unaffected?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory requirements of the APX809-26SAG-7.

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