APX809-46SAG-7 Equivalent & Substitute Parts

Part Overview

The APX809-46SAG-7 is a single-channel power management supervisor IC manufactured by Diodes Incorporated, designed for microprocessor reset and power-on reset applications. This device features push-pull totem pole output configuration with active-low reset functionality and a 140ms minimum reset timeout. The part is currently classified as "Not For New Designs," making identification of functionally equivalent alternatives essential for ongoing production support and design flexibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	APX809-46SAG-7
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	4.63V
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)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the APX809-46SAG-7 is determined by strict equivalence across the following critical parameters:

Voltage Threshold: 4.63V (all substitutes must match exactly)
Output Configuration: Push-Pull, Totem Pole (functional requirement for reset signal delivery)
Reset Logic: Active Low (circuit-level requirement)
Package / Case: TO-236-3, SC-59, SOT-23-3 (physical and electrical compatibility)
Mounting Type: Surface Mount (PCB assembly compatibility)
Number of Voltages Monitored: 1 (functional scope)

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes (Diodes Incorporated): Parts with identical electrical specifications and active product status
Parametric Equivalents (Diodes Incorporated): Parts with matching core parameters but alternative packaging variants
Cross-Manufacturer Equivalents (Analog Devices Inc./Maxim Integrated): Parts from alternative manufacturers meeting all critical electrical and mechanical parameters

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output	Reset Logic	Reset Timeout (Min)	Operating Temp Range	Package	Product Status
APX809-46SAG-7	Diodes Incorporated	4.63V	Push-Pull, Totem Pole	Active Low	140ms	-40°C ~ 85°C	SOT-23-3	Not For New Designs
APX809S-46SA-7	Diodes Incorporated	4.63V	Push-Pull, Totem Pole	Active Low	140ms	-40°C ~ 125°C	SOT-23-3	Active
APX809-46SRG-7	Diodes Incorporated	4.63V	Push-Pull, Totem Pole	Active Low	140ms	-40°C ~ 85°C	SOT23R	Active
ADM809-5LARTZ-RL7	Analog Devices Inc.	4.63V	Push-Pull, Totem Pole	Active Low	30ms	-40°C ~ 150°C	SOT-23-3	Active
ADM809LARTZ-REEL	Analog Devices Inc.	4.63V	Push-Pull, Totem Pole	Active Low	140ms	-40°C ~ 125°C	SOT-23-3	Active
ADM809LARTZ-REEL7	Analog Devices Inc.	4.63V	Push-Pull, Totem Pole	Active Low	140ms	-40°C ~ 125°C	SOT-23-3	Active
MAX6346UR46+T	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	100ms	-40°C ~ 85°C	SOT-23-3	Active
MAX6801UR46D2+T	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	20ms	-40°C ~ 125°C	SOT-23-3	Active
MAX6801UR46D3+T	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	100ms	-40°C ~ 125°C	SOT-23-3	Active
MAX809LEUR+T	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	140ms	-40°C ~ 105°C	SOT-23-3	Active
MAX809LEUR+T10	Analog Devices Inc./Maxim Integrated	4.63V	Push-Pull, Totem Pole	Active Low	140ms	-40°C ~ 105°C	SOT-23-3	Active

Engineering Selection Recommendations

Primary Recommendation: APX809S-46SA-7

The APX809S-46SA-7 is the direct manufacturer substitute from Diodes Incorporated. This part maintains identical electrical specifications (4.63V threshold, 140ms reset timeout, active-low push-pull output) while offering extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C) and active product status. Both parts are ROHS3 compliant, REACH unaffected, and packaged in SOT-23-3. This substitution requires no circuit redesign and provides the highest compatibility assurance.

Secondary Recommendation: ADM809LARTZ-REEL or ADM809LARTZ-REEL7

These Analog Devices parts provide equivalent electrical performance with 140ms reset timeout and 4.63V threshold. Both offer extended operating temperature range (-40°C ~ 125°C) and active product status. The primary distinction is packaging format (standard reel versus cut tape with Digi-Reel). These parts are suitable for applications where cross-manufacturer qualification is acceptable.

Alternative Consideration: MAX809LEUR+T

The MAX809LEUR+T from Analog Devices Inc./Maxim Integrated matches the 140ms reset timeout and 4.63V threshold specifications. Operating temperature range extends to -40°C ~ 105°C. This part is appropriate for designs where the extended temperature capability of the APX809S-46SA-7 is not required but cross-manufacturer sourcing is necessary.

Conditional Use: MAX6801UR46D3+T

The MAX6801UR46D3+T provides 100ms reset timeout (versus 140ms minimum) and extended operating temperature range (-40°C ~ 125°C). This part is suitable only for applications where the shorter reset timeout does not compromise system requirements.

Not Recommended: MAX6801UR46D2+T and ADM809-5LARTZ-RL7

These parts feature significantly reduced reset timeout specifications (20ms and 30ms respectively) and are not suitable as direct substitutes for the APX809-46SAG-7 without circuit-level analysis and validation.

Frequently Asked Questions (FAQ)

Q: Can APX809S-46SA-7 be used as a direct replacement for APX809-46SAG-7?

A: Yes. The APX809S-46SA-7 is the direct manufacturer substitute. Both parts share identical voltage threshold (4.63V), output configuration (push-pull totem pole), reset logic (active low), reset timeout (140ms minimum), and package (SOT-23-3). The APX809S-46SA-7 offers extended operating temperature range and active product status.

Q: What is the significance of the reset timeout parameter in substitution?

A: Reset timeout determines the duration the reset signal remains asserted after power supply stabilization. The APX809-46SAG-7 specifies 140ms minimum. Substitutes with shorter timeouts (20ms, 30ms, 100ms) may not provide adequate reset pulse width for all microprocessor types and require application-level validation before use.

Q: Are cross-manufacturer parts (Analog Devices, Maxim Integrated) fully compatible?

A: Cross-manufacturer parts meeting all critical parameters (4.63V threshold, push-pull totem pole output, active-low reset, SOT-23-3 package) are electrically compatible. However, minor differences in reset timeout, operating temperature range, and device characteristics may exist. Verification against specific application requirements is necessary.

Q: Does package variant affect substitution eligibility?

A: Package variants within the same electrical family (SOT-23-3 versus SOT23R) are physically and electrically compatible for PCB assembly. However, the specific package designation must match the PCB footprint design. APX809-46SRG-7 uses SOT23R packaging and is suitable only if the PCB footprint accommodates this variant.

Q: What compliance certifications apply to all substitute parts?

A: All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the APX809-46SAG-7. Moisture sensitivity level (MSL) is 1 (Unlimited) across all parts, indicating no special moisture handling requirements during storage or assembly.

Q: Can parts with extended operating temperature ranges be used in applications requiring only -40°C ~ 85°C?

A: Yes. Parts with extended temperature ranges (such as APX809S-46SA-7 at -40°C ~ 125°C) are suitable for applications with narrower temperature requirements. The extended range provides additional design margin and flexibility for future applications.

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