MAX690SCSA Equivalent & Substitute Parts

Part Overview

The MAX690SCSA is a single-channel supervisor IC manufactured by Analog Devices Inc./Maxim Integrated, designed for battery backup circuit applications. This component operates as a push-pull, totem pole output supervisor with active-low reset functionality. The part is currently classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Analog Devices Inc./Maxim Integrated
Part Number	MAX690SCSA
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Type	Battery Backup Circuit
Number of Voltages Monitored	1
Voltage - Threshold	2.925V
Output Type	Push-Pull, Totem Pole
Reset	Active Low
Reset Timeout	140ms Minimum
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MAX690SCSA is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Functional Parameters: Substitutes must maintain single-channel voltage monitoring with active-low reset output and 140ms minimum reset timeout to preserve circuit behavior.

Output Configuration: The push-pull, totem pole output type is essential for direct replacement. Parts with alternative output types (open drain/open collector) require circuit redesign and are classified as parametric equivalents rather than direct substitutes.

Voltage Threshold: The 2.925V threshold is the primary electrical specification for this application. Substitute parts with different thresholds (such as 4.65V) are classified as parametric equivalents and require application verification.

Temperature Range: Operating temperature range affects system reliability. The original part operates 0°C ~ 70°C; substitutes with extended ranges (-40°C ~ 85°C) provide broader operational capability.

Compliance Status: RoHS compliance status and product status (active vs. obsolete) influence long-term availability and regulatory requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Threshold	Output Type	Reset Timeout	Operating Temperature	RoHS Status	Packaging
MAX690SCSA	Analog Devices Inc./Maxim Integrated	Obsolete	2.925V	Push-Pull, Totem Pole	140ms Min	0°C ~ 70°C	RoHS non-compliant	8-SOIC
MAX690SCSA+	Analog Devices Inc./Maxim Integrated	Active	2.925V	Push-Pull, Totem Pole	140ms Min	0°C ~ 70°C	ROHS3 Compliant	8-SOIC
MAX704SCSA+	Analog Devices Inc./Maxim Integrated	Active	2.925V	Push-Pull, Totem Pole	140ms Min	0°C ~ 70°C	ROHS3 Compliant	8-SOIC
MAX806SCSA+	Analog Devices Inc./Maxim Integrated	Active	2.925V	Push-Pull, Totem Pole	140ms Min	0°C ~ 70°C	ROHS3 Compliant	8-SOIC
ADM690AARNZ	Analog Devices Inc.	Active	4.65V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	ROHS3 Compliant	8-SOIC
ADM690AARNZ-REEL	Analog Devices Inc.	Active	4.65V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	ROHS3 Compliant	8-SOIC
ADM802LARNZ	Analog Devices Inc.	Active	4.65V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	ROHS3 Compliant	8-SOIC
ADM802LARNZ-REEL	Analog Devices Inc.	Active	4.65V	Push-Pull, Totem Pole	140ms Min	-40°C ~ 85°C	ROHS3 Compliant	8-SOIC
ADM8690ARNZ	Analog Devices Inc.	Active	4.65V	Push-Pull, Totem Pole	35ms Min	-40°C ~ 85°C	ROHS3 Compliant	8-SOIC
LTC690CS8#PBF	Analog Devices Inc.	Active	4.65V	Open Drain or Open Collector	35ms Min	0°C ~ 70°C	ROHS3 Compliant	8-SOIC
LTC690CS8#TRPBF	Analog Devices Inc.	Active	4.65V	Open Drain or Open Collector	35ms Min	0°C ~ 70°C	ROHS3 Compliant	8-SOIC

Engineering Selection Recommendations

Direct Replacement (Same Electrical Specifications):

MAX690SCSA+ is the primary direct replacement. It maintains identical electrical parameters (2.925V threshold, 140ms reset timeout, 0°C ~ 70°C operating range) and package configuration while offering active product status and ROHS3 compliance. This part is recommended for applications requiring exact electrical equivalence.

MAX704SCSA+ and MAX806SCSA+ are parametric equivalents with identical electrical specifications to MAX690SCSA+ and are suitable for direct substitution in the same applications.

Extended Temperature Range Alternatives:

ADM690AARNZ, ADM690AARNZ-REEL, ADM802LARNZ, and ADM802LARNZ-REEL offer extended operating temperature range (-40°C ~ 85°C) compared to the original part. These parts maintain the push-pull, totem pole output configuration and 140ms reset timeout but operate at a 4.65V threshold. Selection of these parts requires application verification to confirm compatibility with the higher voltage threshold.

ADM8690ARNZ provides the extended temperature range with a reduced reset timeout of 35ms minimum. This faster reset response may affect system behavior and requires circuit analysis before implementation.

Output Configuration Alternatives:

LTC690CS8#PBF and LTC690CS8#TRPBF feature open drain/open collector output instead of push-pull, totem pole configuration. These parts require circuit redesign to accommodate the different output type and are not suitable for direct replacement without modification.

Compliance and Availability:

All active substitute parts listed are ROHS3 compliant, addressing regulatory requirements that the obsolete MAX690SCSA does not meet. Extended inventory availability is documented for ADM690AARNZ-REEL (10,300 pcs) and ADM802LARNZ (50,100 pcs), providing supply chain advantages for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can MAX690SCSA+ be used as a direct replacement for MAX690SCSA?

A: Yes. MAX690SCSA+ maintains all critical electrical parameters: 2.925V voltage threshold, push-pull totem pole output, 140ms minimum reset timeout, and 8-SOIC package. The primary difference is active product status and ROHS3 compliance. No circuit modifications are required.

Q: What is the difference between MAX690SCSA+ and ADM690AARNZ?

A: Both parts use the 8-SOIC package and maintain push-pull, totem pole output with 140ms reset timeout. The key difference is voltage threshold: MAX690SCSA+ operates at 2.925V while ADM690AARNZ operates at 4.65V. Additionally, ADM690AARNZ supports extended temperature range (-40°C ~ 85°C) versus 0°C ~ 70°C. Application verification is required if switching between these thresholds.

Q: Why are LTC690CS8#PBF and LTC690CS8#TRPBF listed as substitutes if they have different output types?

A: These parts are listed as parametric equivalents rather than direct substitutes. The open drain/open collector output requires external pull-up resistors and circuit redesign compared to the push-pull, totem pole configuration. They are suitable only for applications where output type modification is acceptable.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging configurations: Tube (standard), Cut Tape & Digi-Reel (CT), and Tape & Reel (TR). All maintain the 8-SOIC form factor. Packaging selection depends on procurement volume and assembly process requirements.

Q: Does the extended temperature range of ADM690AARNZ affect circuit performance?

A: The extended temperature range (-40°C ~ 85°C) provides broader operational capability but does not inherently affect circuit performance within the original operating range (0°C ~ 70°C). However, the 4.65V threshold differs from the original 2.925V specification and requires application verification.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original MAX690SCSA is RoHS non-compliant. This compliance difference is significant for applications subject to regulatory requirements.

Q: What is the significance of the 35ms versus 140ms reset timeout difference?

A: Reset timeout determines the minimum duration the reset output remains active after power supply stabilization. ADM8690ARNZ provides a faster 35ms reset compared to the standard 140ms. This faster response may affect system initialization timing and requires circuit analysis before implementation.

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