APX809-40SAG-7 Equivalent & Substitute Parts

Part Overview

The APX809-40SAG-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 4V threshold voltage and provides push-pull, totem pole output with active-low reset functionality. The part is classified as "Not For New Designs," making identification of equivalent and substitute parts essential for ongoing production support and design continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	APX809-40SAG-7
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	4V
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)

Substitute Part Grouping Explanation

Substitution eligibility for the APX809-40SAG-7 is determined by the following critical parameters:

Voltage Threshold: 4V (all substitutes must match)
Output Type: Push-Pull, Totem Pole (all substitutes must match)
Reset Logic: Active Low (all substitutes must match)
Reset Timeout: 140ms Minimum (all substitutes must match)
Package / Case: TO-236-3, SC-59, SOT-23-3 (all substitutes must match)
Number of Voltages Monitored: 1 (all substitutes must match)
Mounting Type: Surface Mount (all substitutes must match)

Substitutes are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Substitute: APX809S-40SA-7 (Diodes Incorporated) — same manufacturer, active product status, extended operating temperature range (-40°C ~ 125°C).

Parametric Equivalents: APX809-40SRG-7 (Diodes Incorporated), MIC809JUY-TR (Microchip Technology), TCM809JENB713 (Microchip Technology) — all meet core electrical and mechanical parameters with matching 4V threshold, push-pull output, active-low reset, and 140ms timeout.

MFR Recommended Alternatives: ADM809JARTZ-REEL7 (Analog Devices Inc.), MAX809JEUR+T (Analog Devices Inc./Maxim Integrated) — manufacturer-recommended alternatives with active product status and extended operating temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Logic	Reset Timeout	Operating Temperature	Package	Product Status	Inventory (Pcs)
APX809-40SAG-7	Diodes Incorporated	4V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs	8115
APX809S-40SA-7	Diodes Incorporated	4V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C	SOT-23-3	Active	2283
APX809-40SRG-7	Diodes Incorporated	4V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Not For New Designs	13900
ADM809JARTZ-REEL7	Analog Devices Inc.	4V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 125°C	SOT-23-3	Active	9342
MAX809JEUR+T	Analog Devices Inc./Maxim Integrated	4V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 105°C	SOT-23-3	Active	7600
MIC809JUY-TR	Microchip Technology	4V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	3100
TCM809JENB713	Microchip Technology	4V	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	SOT-23-3	Active	35100

Engineering Selection Recommendations

For Active Product Designs: APX809S-40SA-7 is the primary recommendation as the direct manufacturer substitute from Diodes Incorporated with active product status and extended operating temperature range (-40°C ~ 125°C). This part maintains full electrical and mechanical compatibility while providing superior long-term availability.

For Extended Temperature Applications: ADM809JARTZ-REEL7 and MAX809JEUR+T are suitable alternatives when operating temperature requirements exceed -40°C ~ 85°C. Both are active products from Analog Devices Inc. with extended temperature ranges (-40°C ~ 125°C and -40°C ~ 105°C respectively) and ROHS3 compliance.

For High-Volume Availability: TCM809JENB713 (Microchip Technology) offers the highest inventory level (35,100 pcs) among all substitutes while maintaining all core electrical parameters and active product status.

For Existing Designs: APX809-40SRG-7 provides a direct parametric equivalent from the same manufacturer (Diodes Incorporated) with identical electrical specifications and higher inventory availability (13,900 pcs) compared to the original part.

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and identical package specifications (TO-236-3, SC-59, SOT-23-3).

Frequently Asked Questions (FAQ)

Q: Can APX809S-40SA-7 be used as a direct replacement for APX809-40SAG-7?

A: Yes. APX809S-40SA-7 is the direct manufacturer substitute with identical electrical specifications (4V threshold, push-pull output, active-low reset, 140ms timeout) and matching SOT-23-3 package. The primary difference is extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C) and active product status, making it suitable for all applications where APX809-40SAG-7 was used.

Q: What is the difference between parametric equivalents and MFR recommended alternatives?

A: Parametric equivalents (APX809-40SRG-7, MIC809JUY-TR, TCM809JENB713) meet all core electrical and mechanical specifications but are from different manufacturers or product lines. MFR recommended alternatives (ADM809JARTZ-REEL7, MAX809JEUR+T) are specifically recommended by manufacturers as substitutes and typically offer extended temperature ranges or improved long-term availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original APX809-40SAG-7 specifications.

Q: Does operating temperature range affect substitution eligibility?

A: Operating temperature range does not disqualify a part from substitution if the application operates within the substitute's temperature range. However, if your application requires the full -40°C ~ 85°C range, verify the substitute's temperature specification. APX809S-40SA-7, ADM809JARTZ-REEL7, and MAX809JEUR+T offer extended ranges suitable for broader thermal environments.

Q: Can I use MIC809JUY-TR or TCM809JENB713 in place of APX809-40SAG-7?

A: Yes. Both Microchip Technology parts (MIC809JUY-TR and TCM809JENB713) are parametric equivalents with identical 4V threshold, push-pull output, active-low reset, and 140ms timeout specifications. Both are active products with higher inventory availability. Verify packaging format compatibility: MIC809JUY-TR is supplied in Tape & Reel (TR), while TCM809JENB713 is supplied in Cut Tape (CT) & Digi-Reel®.

Q: What is the inventory status of substitute parts?

A: TCM809JENB713 has the highest inventory (35,100 pcs), followed by APX809-40SRG-7 (13,900 pcs) and ADM809JARTZ-REEL7 (9,342 pcs). All substitutes have sufficient stock for production support.

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