APX809-29SAG-7 Equivalent & Substitute Parts

Part Overview

The APX809-29SAG-7 is a single-channel power management supervisor IC manufactured by Diodes Incorporated, designed for reset and power-on reset applications in embedded systems. This device features push-pull totem pole output configuration with a 2.93V threshold voltage and 140ms minimum reset timeout. The part is classified as "Not For New Designs," indicating end-of-life status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for existing applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	APX809-29SAG-7
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	2.93V
Output Configuration	Push-Pull, Totem Pole
Reset Logic	Active Low
Reset Timeout	140ms Minimum
Operating Temperature Range	-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)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution of the APX809-29SAG-7 is determined by strict equivalence across the following critical parameters:

Voltage Threshold: 2.93V (exact match required)
Output Configuration: Push-Pull, Totem Pole (functional equivalence)
Reset Logic: Active Low (functional equivalence)
Reset Timeout: 140ms Minimum (timing specification)
Package / Case: TO-236-3, SC-59, SOT-23-3 (physical and electrical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Operating Temperature Range: -40°C ~ 85°C minimum (thermal compatibility)
RoHS Compliance: ROHS3 Compliant (regulatory equivalence)

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes (Diodes Incorporated): Parts from the same manufacturer with identical electrical specifications and packaging, differing only in product status or packaging format.

Parametric Equivalents (Cross-Manufacturer): Parts from alternative manufacturers (Analog Devices Inc., onsemi, Maxim Integrated) that meet all critical electrical and mechanical parameters, with variations in reset timeout or operating temperature range noted.

Manufacturer-Recommended Alternatives: Parts explicitly recommended by manufacturers as functional replacements, with documented parameter compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output	Reset Timeout	Operating Temp	Package	Product Status	Inventory
APX809-29SAG-7	Diodes Incorporated	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs	30,100 Pcs
APX809S-29SA-7	Diodes Incorporated	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 125°C	SOT-23-3	Active	12,100 Pcs
APX809-29SRG-7	Diodes Incorporated	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT23R	Not For New Designs	18,960 Pcs
PT7M7809STEX	Diodes Incorporated	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-23-3	Last Time Buy	95,200 Pcs
CAT809STBI-GT3	onsemi	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	SOT-23-3	Obsolete	95,300 Pcs
ADM6326-29ARTZ-R7	Analog Devices Inc.	2.93V	Push-Pull, Totem Pole	100ms Min	-40°C ~ 85°C	SOT-23-3	Active	13,603 Pcs
ADM809-5SARTZ-RL7	Analog Devices Inc.	2.93V	Push-Pull, Totem Pole	30ms Min	-40°C ~ 150°C	SOT-23-3	Active	3,100 Pcs
ADM809SARTZ-REEL7	Analog Devices Inc.	2.93V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 125°C	SOT-23-3	Active	117,504 Pcs
MAX6326UR29+T	Analog Devices Inc./Maxim Integrated	2.93V	Push-Pull, Totem Pole	100ms Min	-40°C ~ 85°C	SOT-23-3	Active	2,615 Pcs
MAX6801UR29D2+T	Analog Devices Inc./Maxim Integrated	2.93V	Push-Pull, Totem Pole	20ms Min	-40°C ~ 125°C	SOT-23-3	Active	2,200 Pcs
MAX6801UR29D3+T	Analog Devices Inc./Maxim Integrated	2.93V	Push-Pull, Totem Pole	100ms Min	-40°C ~ 125°C	SOT-23-3	Active	9,605 Pcs

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement: APX809S-29SA-7 (Diodes Incorporated) is the optimal direct substitute. It maintains identical electrical specifications (2.93V threshold, 140ms reset timeout, push-pull totem pole output) and identical SOT-23-3 packaging. The extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C) provides additional thermal margin. Active product status ensures ongoing availability and manufacturing support.

Alternative for Extended Temperature Operation: ADM809SARTZ-REEL7 (Analog Devices Inc.) provides equivalent electrical performance with extended operating temperature range (-40°C ~ 125°C). This part is actively manufactured with substantial inventory (117,504 Pcs), ensuring long-term supply chain stability. Reset timeout specification matches the original part exactly at 140ms minimum.

Alternative for Reduced Reset Timeout Requirements: ADM6326-29ARTZ-R7 (Analog Devices Inc.) meets all critical parameters with a reduced reset timeout of 100ms minimum. This part is suitable for applications where faster reset response is acceptable or beneficial. Active product status and ROHS3 compliance are confirmed.

Alternatives with Shorter Reset Timeouts: ADM809-5SARTZ-RL7 (30ms) and MAX6801UR29D2+T (20ms) are suitable only for applications where the original 140ms reset timeout specification is not a functional requirement. These parts provide faster reset response and extended temperature ranges but represent functional deviations from the original specification.

Not Recommended: CAT809STBI-GT3 (onsemi) is classified as Obsolete and should not be selected for new procurement despite available inventory. PT7M7809STEX (Diodes Incorporated) is classified as Last Time Buy, indicating imminent discontinuation.

Frequently Asked Questions (FAQ)

Q: Can APX809S-29SA-7 be used as a direct replacement for APX809-29SAG-7?

A: Yes. APX809S-29SA-7 is a direct substitute with identical electrical specifications (2.93V threshold, 140ms reset timeout, push-pull totem pole output) and identical SOT-23-3 packaging. The only differences are active product status and extended operating temperature range (-40°C ~ 125°C), both of which provide improved design flexibility.

Q: What is the difference between APX809-29SAG-7 and APX809-29SRG-7?

A: Both parts are manufactured by Diodes Incorporated with identical electrical specifications. The primary difference is packaging format: APX809-29SAG-7 uses Cut Tape (CT) & Digi-Reel® packaging, while APX809-29SRG-7 uses Tape & Reel (TR) with SOT23R supplier device package. Both are classified as "Not For New Designs."

Q: Are cross-manufacturer substitutes (Analog Devices, Maxim) electrically compatible?

A: Yes, for the critical parameters. All listed cross-manufacturer substitutes maintain the 2.93V threshold voltage, push-pull totem pole output, active low reset logic, and SOT-23-3 package. Variations exist in reset timeout specifications (ranging from 20ms to 140ms minimum) and operating temperature ranges. Selection depends on whether these variations are acceptable for the specific application.

Q: What does "Reset Timeout" mean, and why does it vary among substitutes?

A: Reset Timeout specifies the minimum duration the reset output remains asserted after the supply voltage crosses the threshold. The original APX809-29SAG-7 specifies 140ms minimum. Substitutes with shorter timeouts (100ms, 30ms, 20ms) will release the reset signal faster. This is acceptable only if the application does not require the full 140ms reset duration for proper system initialization.

Q: Why is ADM809SARTZ-REEL7 recommended despite having extended temperature range?

A: ADM809SARTZ-REEL7 meets all critical electrical specifications (2.93V threshold, 140ms reset timeout, push-pull totem pole output, SOT-23-3 package) with active product status and substantial inventory. The extended operating temperature range (-40°C ~ 125°C) is a design advantage, not a limitation, providing additional thermal margin for applications operating at elevated temperatures.

Q: Can I use parts with shorter reset timeouts (20ms, 30ms, 100ms) instead of 140ms?

A: Only if your application does not require the full 140ms reset duration. Shorter reset timeouts will cause the reset signal to release faster after power-up. This may be acceptable or beneficial for some applications but represents a functional deviation from the original specification. Verify system initialization timing requirements before selecting these alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are confirmed ROHS3 compliant, matching the original APX809-29SAG-7 compliance status.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape (CT) packaging provides individual component strips suitable for manual assembly or small-volume production. Tape & Reel (TR) packaging provides continuous reels suitable for automated assembly equipment. Both formats contain identical components; the difference is in handling and assembly methodology. Verify your assembly equipment compatibility before selecting packaging format.

Q: Why is CAT809STBI-GT3 not recommended?

A: CAT809STBI-GT3 is classified as Obsolete, indicating the manufacturer (onsemi) has discontinued production and support. While inventory is currently available, future procurement cannot be guaranteed. Active product alternatives are preferred for design continuity and long-term supply chain stability.

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