A101SYAB Toggle Switch SPDT Equivalent & Substitute Parts

Part Overview

The A101SYAB is a toggle switch manufactured by TE Connectivity ALCOSWITCH Switches, configured as a Single Pole Double Throw (SPDT) panel mount switch with right angle orientation. This component operates at 0.4VA with voltage ratings of 20V AC/DC and features a standard round actuator with PC pin termination. The A101SYAB is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing applications and new designs. Active alternatives from multiple manufacturers provide functional compatibility while offering improved product status and compliance certifications.

Key Parameters

Parameter	A101SYAB Value
Circuit Configuration	SPDT
Switch Function	On-On
Current Rating	0.4VA (AC/DC)
Voltage Rating - AC	20V
Voltage Rating - DC	20V
Mounting Type	Panel Mount, Right Angle
Actuator Type	Standard Round
Actuator Length	10.41mm
Termination Style	PC Pin
Panel Cutout Dimensions	Circular - 6.35mm Dia
Bushing Thread	1/4-40
Operating Temperature Range	-20°C ~ 85°C
Electrical Life	6,000 Cycles
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the A101SYAB is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Electrical Parameters: Circuit configuration (SPDT), switch function (On-On), current rating (0.4VA AC/DC), and voltage ratings (20V AC/DC) must match or exceed the original specification without exceeding application limits.

Mechanical Parameters: Mounting type (Panel Mount, Right Angle), panel cutout dimensions (Circular 6.35mm Dia), bushing thread (1/4-40), and termination style (PC Pin) must be identical to ensure physical and electrical compatibility.

Actuator Specifications: Actuator type and length determine panel interface compatibility. The standard round actuator at 10.41mm length is the baseline for direct substitution.

Environmental Specifications: Operating temperature range and electrical life cycle ratings indicate component durability and reliability in the intended application environment.

Substitute parts are grouped into two categories:

Direct Electrical Equivalents: Parts matching all electrical parameters (0.4VA, 20V AC/DC) with identical mechanical interfaces. These include 4-1825136-2 (TE Connectivity), 100SP1T6B11M6REH (E-Switch), A123S1DAB, and A123S1YAB (Electroswitch).

Higher-Rated Alternatives: Parts exceeding the electrical specifications (5A, 120V-125V) while maintaining mechanical compatibility. These include 100SP1T1B1M6QEH (E-Switch), 34ASP11B1M6GT, and 34ASP11B1M6QT (Grayhill), and 7101SYAQE (C&K). These alternatives provide enhanced performance margins and extended electrical life cycles.

Parameter Comparison

Parameter	A101SYAB	4-1825136-2	100SP1T6B11M6REH	100SP1T1B1M6QEH	34ASP11B1M6GT	7101SYAQE	A123S1DAB	A123S1YAB
Manufacturer	TE Connectivity	TE Connectivity	E-Switch	E-Switch	Grayhill Inc.	C&K	Electroswitch	Electroswitch
Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Switch Function	On-On	On-On	On-On	On-On	On-On	On-On	On-On	On-On
Current Rating	0.4VA	0.4VA	0.4VA	5A	5A	5A	0.5VA	0.5VA
Voltage Rating - AC	20V	20V	20V	120V	125V	120V	28V	28V
Voltage Rating - DC	20V	20V	20V	28V	28V	28V	28V	28V
Mounting Type	Panel Mount, Right Angle	Panel Mount, Right Angle	Panel Mount, Right Angle	Panel Mount, Right Angle	Panel Mount, Right Angle	Panel Mount, Right Angle	Panel Mount, Right Angle	Panel Mount, Right Angle
Actuator Type	Standard Round	Standard Round	Flat Anti-Rotation	Standard Round	Standard Round	Standard Round	Standard Round	Standard Round
Actuator Length	10.41mm	10.41mm	12.30mm	10.41mm	10.41mm	10.67mm	10.41mm	10.41mm
Termination Style	PC Pin	PC Pin	PC Pin	PC Pin	PC Pin	PC Pin	PC Pin	PC Pin
Panel Cutout Dimensions	Circular - 6.35mm Dia	Circular - 6.35mm Dia	Circular - 6.35mm Dia	Circular - 6.35mm Dia	Circular - 6.35mm Dia	Circular - 6.35mm Dia	Not Specified	Not Specified
Bushing Thread	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40
Operating Temperature	-20°C ~ 85°C	-30°C ~ 85°C	-30°C ~ 85°C	-30°C ~ 85°C	-30°C ~ 85°C	-30°C ~ 85°C	-30°C ~ 90°C	-30°C ~ 90°C
Electrical Life	6,000 Cycles	6,000 Cycles	40,000 Cycles	40,000 Cycles	40,000 Cycles	100,000 Cycles	60,000 Cycles	60,000 Cycles
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant

Engineering Selection Recommendations

Direct Electrical Equivalent - Primary Recommendation:

The 4-1825136-2 (TE Connectivity ALCOSWITCH Switches) is the direct successor to the A101SYAB. This part maintains identical electrical specifications (0.4VA, 20V AC/DC), mechanical interface (Panel Mount, Right Angle, 1/4-40 bushing thread, 6.35mm circular cutout), and actuator configuration (Standard Round, 10.41mm length). The 4-1825136-2 is classified as Active product status with ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original component. Operating temperature range extends to -30°C, providing improved low-temperature performance. Electrical life remains at 6,000 cycles, consistent with the original specification.

Direct Electrical Equivalent - Secondary Option:

The 100SP1T6B11M6REH (E-Switch, Series 100) matches all electrical parameters (0.4VA, 20V AC/DC) and mechanical requirements. This part features a Flat Anti-Rotation actuator at 12.30mm length, which differs from the standard round actuator of the A101SYAB. This actuator variation requires verification of panel cutout compatibility and operator interface requirements. The component is Active with ROHS3 compliance and provides 40,000 electrical life cycles, exceeding the original specification by a factor of 6.7.

Higher-Rated Alternatives for Enhanced Performance:

The 7101SYAQE (C&K, Series 7000) provides the highest electrical life rating at 100,000 cycles while maintaining mechanical compatibility. This part operates at 5A/120V AC and 28V DC, exceeding the original 0.4VA/20V specification. The 7101SYAQE is suitable for applications requiring extended component life and higher electrical margins. ROHS3 compliance and Active product status are confirmed.

The 100SP1T1B1M6QEH (E-Switch, Series 100) and Grayhill alternatives (34ASP11B1M6GT, 34ASP11B1M6QT) provide 5A/120V-125V ratings with 40,000 electrical life cycles. These components are appropriate for applications where higher current capacity and voltage margins are required.

Compliance Considerations:

All recommended substitutes are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete A101SYAB. Selection between alternatives should prioritize Active product status and compliance certifications to ensure long-term component availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can the 4-1825136-2 be used as a direct replacement for the A101SYAB?

A: Yes. The 4-1825136-2 maintains identical electrical specifications (0.4VA, 20V AC/DC), circuit configuration (SPDT On-On), mechanical mounting (Panel Mount, Right Angle), panel cutout dimensions (6.35mm circular), bushing thread (1/4-40), and actuator configuration (Standard Round, 10.41mm). The component is electrically and mechanically interchangeable. The 4-1825136-2 is Active product status with ROHS3 compliance, providing regulatory and availability advantages over the obsolete A101SYAB.

Q: What is the difference between the 100SP1T6B11M6REH and the A101SYAB?

A: The 100SP1T6B11M6REH matches the electrical specifications (0.4VA, 20V AC/DC) and mechanical interface (Panel Mount, Right Angle, 1/4-40 bushing, 6.35mm cutout) of the A101SYAB. The primary difference is the actuator type: the 100SP1T6B11M6REH features a Flat Anti-Rotation actuator at 12.30mm length, compared to the Standard Round actuator at 10.41mm on the A101SYAB. This actuator variation affects panel interface geometry and operator feel. Verify panel cutout compatibility and actuator engagement requirements before substitution. The 100SP1T6B11M6REH provides 40,000 electrical life cycles versus 6,000 on the original component.

Q: Can higher-rated switches like the 7101SYAQE be used in place of the A101SYAB?

A: Higher-rated switches can be used in applications where the original 0.4VA/20V specification is not a limiting constraint. The 7101SYAQE (5A/120V AC, 28V DC) maintains mechanical compatibility (Panel Mount, Right Angle, 1/4-40 bushing, 6.35mm cutout, Standard Round actuator at 10.67mm) and circuit configuration (SPDT On-On). The increased electrical ratings provide performance margins and extended electrical life (100,000 cycles). However, substitution is appropriate only when the application circuit and power supply can accommodate the higher-rated component without introducing design complications. Verify that the 10.67mm actuator length is compatible with panel geometry.

Q: What are the packaging differences among the substitute parts?

A: The 4-1825136-2 is supplied in Bulk packaging. The 100SP1T6B11M6REH and 100SP1T1B1M6QEH (E-Switch) are supplied in Bulk packaging. The Grayhill alternatives (34ASP11B1M6GT, 34ASP11B1M6QT) are supplied in Bulk packaging. The 7101SYAQE (C&K) is supplied in Tray packaging. The Electroswitch alternatives (A123S1DAB, A123S1YAB) are supplied in Bulk packaging. Packaging selection affects inventory management and component handling but does not impact electrical or mechanical compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts are RoHS compliant. The 4-1825136-2, 100SP1T6B11M6REH, 100SP1T1B1M6QEH, 34ASP11B1M6GT, 34ASP11B1M6QT, and 7101SYAQE are ROHS3 compliant. The A123S1DAB and A123S1YAB are RoHS compliant. The original A101SYAB is RoHS non-compliant. Substitution with any recommended alternative addresses regulatory compliance requirements.

Q: What is the operating temperature range difference between the A101SYAB and its substitutes?

A: The A101SYAB operates from -20°C to 85°C. The 4-1825136-2, 100SP1T6B11M6REH, 100SP1T1B1M6QEH, 34ASP11B1M6GT, 34ASP11B1M6QT, and 7101SYAQE all operate from -30°C to 85°C, providing 10°C additional low-temperature capability. The A123S1DAB and A123S1YAB operate from -30°C to 90°C, providing both extended low-temperature and high-temperature ranges. Selection should be based on application environmental requirements.

Q: Which substitute provides the longest electrical life?

A: The 7101SYAQE (C&K, Series 7000) provides the longest electrical life at 100,000 cycles, compared to 6,000 cycles on the A101SYAB. The 100SP1T6B11M6REH, 100SP1T1B1M6QEH, 34ASP11B1M6GT, and 34ASP11B1M6QT all provide 40,000 cycles. The A123S1DAB and A123S1YAB provide 60,000 cycles. The 4-1825136-2 maintains the original 6,000-cycle specification. Extended electrical life indicates greater durability and reliability in high-cycle applications.

Q: Is the panel cutout dimension critical for substitution?

A: Yes. The panel cutout dimension is critical for mechanical compatibility. All substitute parts except A123S1DAB and A123S1YAB specify a Circular 6.35mm diameter cutout, matching the A101SYAB. The A123S1DAB and A123S1YAB do not specify panel cutout dimensions in the provided data; verification with the manufacturer is required before substitution. The 1/4-40 bushing thread is consistent across all parts, ensuring fastening compatibility.

Q: What inventory levels are available for each substitute?

A: The 4-1825136-2 has 2,213 pieces in stock. The 100SP1T1B1M6QEH has 655 pieces. The 100SP1T6B11M6REH has 1,164 pieces. The 34ASP11B1M6GT has 1,073 pieces. The 34ASP11B1M6QT has 653 pieces. The 7101SYAQE has 3,165 pieces. The A123S1DAB has 767 pieces. The A123S1YAB has 1,024 pieces. The 7101SYAQE offers the highest inventory availability.

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