SP691ACT-L Equivalent & Substitute Parts

Part Overview

The SP691ACT-L is a Power Management Integrated Circuit (PMIC) supervisor manufactured by MaxLinear, Inc., designed for single-channel voltage monitoring and reset signal generation. This device operates as a Simple Reset/Power-On Reset supervisor with open drain and push-pull output capability, housed in a 16-SOIC surface mount package. The SP691ACT-L is classified as obsolete product status, making equivalent and substitute parts necessary for ongoing system support and new design implementations. Substitute parts must maintain electrical compatibility across voltage threshold, output type, reset polarity, and reset timeout specifications while accommodating packaging and temperature range variations.

Key Parameters

Parameter	SP691ACT-L
Manufacturer	MaxLinear, Inc.
Category	Power Management (PMIC)
Package / Case	16-SOIC (0.295", 7.50mm Width)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	4.65V
Output	Open Drain, Push-Pull
Reset	Active High/Active Low
Reset Timeout	140ms Minimum
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the SP691ACT-L is determined by strict alignment of the following critical electrical and mechanical parameters:

Core Substitution Criteria:

Voltage threshold: 4.65V (exact match required)
Number of voltages monitored: 1 channel
Output configuration: Open Drain, Push-Pull capability
Reset polarity: Active High/Active Low
Reset timeout: 140ms minimum
Package type: 16-SOIC surface mount
Pin count and pitch: 16-pin, 0.295" width

Acceptable Variations:

Operating temperature range may extend beyond the original 0°C ~ 70°C specification (wider ranges are compatible)
Packaging format (Tube, Tape & Reel, Cut Tape) does not affect electrical compatibility
Product status transition from Obsolete to Active is acceptable
Moisture Sensitivity Level may improve (lower MSL values indicate better moisture resistance)
Supervisor type may vary between Simple Reset/Power-On Reset and Battery Backup Circuit when all electrical parameters align

Substitute parts must satisfy all core criteria simultaneously. Parts failing to meet any single core parameter are not electrically compatible.

Parameter Comparison

Parameter	SP691ACT-L	ADM691AARWZ	ADM691AARWZ-REEL	LTC691CSW#PBF	LTC691CSW#TRPBF	LTC691ISW#PBF	LTC691ISW#TRPBF	MAX691ACWE+	MAX691ACWE+T	MAX691AEWE+	MAX691AEWE+T
Manufacturer	MaxLinear, Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Voltage - Threshold	4.65V	4.65V	4.65V	4.65V	4.65V	4.65V	4.65V	4.65V	4.65V	4.65V	4.65V
Number of Voltages Monitored	1	1	1	1	1	1	1	1	1	1	1
Output	Open Drain, Push-Pull	Open Drain, Push-Pull	Open Drain, Push-Pull	Open Drain or Open Collector	Open Drain or Open Collector	Open Drain or Open Collector	Open Drain or Open Collector	Push-Pull, Push-Pull	Push-Pull, Push-Pull	Push-Pull, Push-Pull	Push-Pull, Push-Pull
Reset	Active High/Active Low	Active High/Active Low	Active High/Active Low	Active High/Active Low	Active High/Active Low	Active High/Active Low	Active High/Active Low	Active High/Active Low	Active High/Active Low	Active High/Active Low	Active High/Active Low
Reset Timeout	140ms Minimum	140ms Minimum	140ms Minimum	35ms Minimum	35ms Minimum	35ms Minimum	35ms Minimum	140ms Minimum	140ms Minimum	140ms Minimum	140ms Minimum
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Exact Electrical Match):

ADM691AARWZ and ADM691AARWZ-REEL are manufacturer-recommended substitutes with identical electrical specifications to the SP691ACT-L. Both devices maintain 4.65V threshold, 140ms reset timeout, and Open Drain/Push-Pull output configuration. The ADM691AARWZ-REEL variant provides superior inventory availability (4407 pcs) compared to the tube-packaged ADM691AARWZ (1900 pcs). Both variants feature extended operating temperature range (-40°C ~ 85°C) and improved moisture sensitivity (MSL 1, Unlimited). Active product status ensures long-term supply continuity and technical support availability.

Secondary Substitutes (Reset Timeout Deviation):

LTC691CSW#PBF, LTC691CSW#TRPBF, LTC691ISW#PBF, and LTC691ISW#TRPBF are electrically compatible with one critical exception: reset timeout specification is 35ms minimum instead of 140ms minimum. These devices maintain identical voltage threshold (4.65V), single-channel monitoring, and output configuration (Open Drain or Open Collector). Selection of LTC691 variants is appropriate only when system design accommodates shorter reset timeout intervals. Temperature-rated variants (LTC691ISW series) provide -40°C ~ 85°C operating range, while commercial-grade variants (LTC691CSW series) operate within 0°C ~ 70°C range.

Tertiary Substitutes (Output Configuration Deviation):

MAX691ACWE+, MAX691ACWE+T, MAX691AEWE+, and MAX691AEWE+T maintain 4.65V threshold and 140ms reset timeout but feature Push-Pull output configuration exclusively, differing from the SP691ACT-L's Open Drain/Push-Pull capability. These devices are suitable for applications requiring push-pull output exclusively. MAX691AEWE variants support extended temperature range (-40°C ~ 85°C), while MAX691ACWE variants operate within 0°C ~ 70°C range. Cut Tape & Digi-Reel packaging (+T suffix) provides alternative distribution format to tube packaging.

Compliance Considerations:

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental regulatory requirements. Moisture sensitivity improvements (MSL 1 versus MSL 3) reduce handling and storage constraints. All substitutes maintain EAR99 export classification and identical HTSUS tariff code (8542.39.0001).

Frequently Asked Questions (FAQ)

Q: Can LTC691 series parts substitute for SP691ACT-L despite different reset timeout specifications?

A: LTC691 series devices (35ms minimum reset timeout) are electrically compatible with SP691ACT-L only if system design specifications permit shorter reset timeout intervals. The 35ms timeout is functionally shorter than the 140ms requirement, which may affect power-on sequencing and system initialization timing. Circuit-level validation is required before implementation.

Q: What is the difference between ADM691AARWZ and ADM691AARWZ-REEL?

A: Both variants are electrically identical with matching electrical specifications, operating temperature range, and compliance certifications. The primary difference is packaging format: ADM691AARWZ is supplied in tube packaging, while ADM691AARWZ-REEL is supplied in Tape & Reel format. ADM691AARWZ-REEL provides higher inventory availability (4407 pcs) and is suitable for automated assembly processes.

Q: Are MAX691 series parts direct substitutes for SP691ACT-L?

A: MAX691 series parts maintain voltage threshold (4.65V) and reset timeout (140ms) specifications but feature Push-Pull output exclusively rather than the SP691ACT-L's Open Drain/Push-Pull configuration. Selection depends on whether the application circuit requires open drain capability. If the design uses only push-pull output, MAX691 variants are compatible.

Q: What is the significance of operating temperature range differences?

A: SP691ACT-L operates within 0°C ~ 70°C range. Substitute parts with extended range (-40°C ~ 85°C) provide broader environmental compatibility and are suitable for applications requiring wider temperature operation. Extended-range variants do not restrict use in narrower temperature applications; they simply provide additional operational margin.

Q: How does moisture sensitivity level (MSL) affect part selection?

A: SP691ACT-L carries MSL 3 (168-hour moisture absorption limit), requiring controlled storage and handling. All substitute parts feature MSL 1 (unlimited moisture absorption), eliminating moisture-related handling constraints and reducing storage complexity. This represents a significant improvement in manufacturing and logistics efficiency.

Q: Can I use commercial-grade (0°C ~ 70°C) LTC691CSW variants in applications requiring extended temperature operation?

A: No. LTC691CSW series is rated for 0°C ~ 70°C operation only. Applications requiring -40°C ~ 85°C operation must use LTC691ISW series variants. Temperature rating mismatch may result in device malfunction or failure outside specified operating range.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube (standard packaging), Tape & Reel (TR) for automated assembly, and Cut Tape (CT) & Digi-Reel for mixed-volume applications. All packaging formats contain electrically identical devices; selection depends on assembly process requirements and order quantity.

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