MAX690EPA Equivalent & Substitute Parts

Part Overview

The MAX690EPA is a supervisor integrated circuit designed for battery backup circuit applications, featuring push-pull totem pole output configuration with active low reset. This 8-DIP package device monitors a single voltage threshold at 4.65V with a 35ms minimum reset timeout and operates across the industrial temperature range of -40°C to 85°C.

The MAX690EPA is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and meet current compliance requirements including RoHS3 standards.

Key Parameters

Parameter	MAX690EPA
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Power Management (PMIC)
Type	Battery Backup Circuit
Number of Voltages Monitored	1
Voltage Threshold	4.65V
Output Configuration	Push-Pull, Totem Pole
Reset Logic	Active Low
Reset Timeout	35ms Minimum
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the MAX690EPA is determined by the following critical parameters:

Output Configuration: Push-Pull, Totem Pole output is required for direct functional replacement
Voltage Threshold: 4.65V monitoring capability
Reset Logic: Active Low reset behavior
Package: 8-DIP (0.300", 7.62mm) through-hole mounting
Number of Voltages Monitored: Single channel supervision
Operating Temperature Range: -40°C to 85°C support

Substitute parts are categorized into two groups:

Group 1 - Direct Functional Equivalents (Push-Pull Output) Parts maintaining identical output configuration, reset logic, and reset timeout specifications. These provide pin-compatible replacement with equivalent electrical behavior.

Group 2 - Parametric Equivalents (Open Drain Output) Parts with identical voltage monitoring, threshold, and package but featuring open drain output configuration instead of push-pull. These require circuit design review to confirm output stage compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Reset Logic	Reset Timeout	Operating Temp	RoHS Status	Package
MAX690EPA	Analog Devices Inc./Maxim Integrated	Obsolete	Push-Pull, Totem Pole	Active Low	35ms Min	-40°C ~ 85°C	RoHS non-compliant	8-DIP
MAX690EPA+	Analog Devices Inc./Maxim Integrated	Active	Push-Pull, Totem Pole	Active Low	35ms Min	-40°C ~ 85°C	ROHS3 Compliant	8-DIP
ADM690ANZ	Analog Devices Inc.	Active	Push-Pull, Totem Pole	Active Low	35ms Min	-40°C ~ 85°C	ROHS3 Compliant	8-DIP
ADM690AANZ	Analog Devices Inc.	Active	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	ROHS3 Compliant	8-DIP
ADM694ANZ	Analog Devices Inc.	Active	Push-Pull, Totem Pole	Active Low	140ms Min	-40°C ~ 85°C	ROHS3 Compliant	8-DIP
LTC690CN8#PBF	Analog Devices Inc.	Active	Open Drain or Open Collector	Active Low	35ms Min	0°C ~ 70°C	ROHS3 Compliant	8-DIP
LTC690IN8#PBF	Analog Devices Inc.	Active	Open Drain or Open Collector	Active Low	35ms Min	-40°C ~ 85°C	ROHS3 Compliant	8-DIP
LTC694CN8#PBF	Analog Devices Inc.	Active	Open Drain or Open Collector	Active High/Active Low	140ms Min	0°C ~ 70°C	ROHS3 Compliant	8-DIP
LTC694IN8#PBF	Linear Technology	Active	Open Drain or Open Collector	Active High/Active Low	140ms Min	-40°C ~ 85°C	REACH Unaffected	8-DIP

Engineering Selection Recommendations

Primary Recommendation: MAX690EPA+

The MAX690EPA+ is the direct successor to the MAX690EPA, maintaining identical electrical specifications including push-pull output configuration, 35ms reset timeout, and active low reset logic. This part is currently in active production status and meets ROHS3 compliance requirements. The MAX690EPA+ is the preferred choice for direct replacement in existing designs without circuit modification.

Secondary Recommendation: ADM690ANZ

The ADM690ANZ provides equivalent functionality with push-pull output, 35ms reset timeout, and active low reset across the full industrial temperature range. This part is actively manufactured and ROHS3 compliant, offering supply chain continuity with identical electrical behavior to the original MAX690EPA.

Alternative with Extended Reset Timeout: ADM690AANZ or ADM694ANZ

Both ADM690AANZ and ADM694ANZ are active production parts with ROHS3 compliance. These parts feature extended 140ms reset timeout specifications compared to the original 35ms. Selection of these alternatives requires verification that the extended reset timeout is compatible with system requirements.

Open Drain Output Alternatives: LTC690IN8#PBF or LTC694IN8#PBF

The LTC690IN8#PBF and LTC694IN8#PBF feature open drain output configuration instead of push-pull. These parts require circuit design review to confirm that the output stage change is compatible with downstream logic. The LTC690IN8#PBF maintains the 35ms reset timeout, while LTC694IN8#PBF provides 140ms reset timeout. Both support the full -40°C to 85°C operating range.

All recommended substitutes maintain the 4.65V voltage threshold, single channel monitoring, 8-DIP package, and through-hole mounting of the original MAX690EPA.

Frequently Asked Questions (FAQ)

Q: Can MAX690EPA+ be used as a direct replacement for MAX690EPA?

A: Yes. The MAX690EPA+ maintains identical electrical specifications including push-pull output, 35ms reset timeout, active low reset logic, and 8-DIP package. The primary difference is product status (active vs. obsolete) and RoHS3 compliance. No circuit modification is required.

Q: What is the difference between ADM690ANZ and ADM690AANZ?

A: Both parts feature push-pull output and active low reset across -40°C to 85°C. The primary difference is reset timeout: ADM690ANZ specifies 35ms minimum, while ADM690AANZ specifies 140ms minimum. Selection depends on system reset timing requirements.

Q: Can LTC690 series parts replace MAX690EPA?

A: LTC690 series parts (LTC690CN8#PBF, LTC690IN8#PBF) maintain the 4.65V threshold, single channel monitoring, and 8-DIP package. However, they feature open drain output instead of push-pull. This output configuration change requires circuit design review to confirm compatibility with downstream logic and pull-up resistor requirements.

Q: What is the significance of the temperature range difference between LTC690CN8#PBF and LTC690IN8#PBF?

A: LTC690CN8#PBF operates 0°C to 70°C, while LTC690IN8#PBF operates -40°C to 85°C. For applications requiring full industrial temperature range operation, LTC690IN8#PBF is the appropriate selection.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts except LTC694IN8#PBF are explicitly marked ROHS3 Compliant. LTC694IN8#PBF is marked REACH Unaffected. Verify compliance requirements for your specific application and regulatory jurisdiction.

Q: What does "push-pull" output mean compared to "open drain"?

A: Push-pull output actively drives both high and low logic states through internal transistor pairs. Open drain output only actively pulls low; the high state requires an external pull-up resistor. This difference affects circuit design and may require modifications when substituting between output types.

Q: Can ADM694ANZ be used where ADM690ANZ is specified?

A: Both parts feature push-pull output, active low reset, and -40°C to 85°C operation. The difference is reset timeout: ADM690ANZ specifies 35ms, while ADM694ANZ specifies 140ms. Substitution is possible only if the extended reset timeout is compatible with system requirements.

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