DA3C-D1AA Equivalent & Substitute Parts Reference

Part Overview

The DA3C-D1AA is a snap-action SPDT switch manufactured by ZF Electronics, designed for chassis mount applications with solder lug termination. This component operates at 0.1A (100mA) AC at 125V with a round pin plunger actuator and On-Mom switch function. The part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	DA3C-D1AA Value
Manufacturer	ZF Electronics
Circuit Configuration	SPDT
Switch Function	On-Mom
Current Rating (AC)	100mA
Voltage Rating (AC)	125V
Actuator Type	Round (Pin Plunger)
Mounting Type	Chassis Mount
Termination Style	Solder Lug
Operating Position	0.330" (8.4mm)
Operating Temperature Range	-40°C to 85°C
Electrical Life	100,000 Cycles
RoHS Status	RoHS Non-Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the DA3C-D1AA is determined by the following critical parameters:

Primary Compatibility Criteria:

Circuit configuration: SPDT
Switch function: On-Mom
Actuator type: Round (Pin Plunger)
Mounting type: Chassis Mount
Termination style: Solder Lug
Operating position: 0.330" (8.4mm)

Electrical Compatibility Criteria:

Current rating must equal or exceed 100mA AC
Voltage rating (AC) must equal or exceed 125V
Operating temperature range must encompass -40°C to 85°C

Substitute parts are grouped into two categories based on electrical ratings:

Category A - Direct Current Rating Match (100mA AC at 125V): DB3C-A1AA (ZF Electronics) - Active status, improved mechanical specifications, RoHS3 compliant

Category B - Higher Current Rating (1A to 5A AC at 125V-250V): 11SM423, 11SM3, 11SM244, 11SM2440, 11SM401, 11SM703, 11SM701, 12SM4 (Honeywell Sensing and Productivity Solutions) - All active status, RoHS compliant, higher electrical capacity

Parameter Comparison

Parameter	DA3C-D1AA	DB3C-A1AA	11SM423	11SM3	11SM244	11SM401	11SM701	11SM703	12SM4
Manufacturer	ZF Electronics	ZF Electronics	Honeywell	Honeywell	Honeywell	Honeywell	Honeywell	Honeywell	Honeywell
Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Switch Function	On-Mom	On-Mom	On-Mom	On-Mom	On-Mom	On-Mom	On-Mom	On-Mom	On-Mom
Current Rating (AC)	100mA	100mA	1A	5A	5A	5A	4A	4A	1A
Voltage Rating (AC)	125V	125V	125V	250V	250V	250V	250V	250V	125V
Actuator Type	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount
Termination Style	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug
Operating Position	0.330" (8.4mm)	0.330" (8.4mm)	0.330" (8.4mm)	0.330" (8.4mm)	0.330" (8.4mm)	0.330" (8.4mm)	0.330" (8.4mm)	0.330" (8.4mm)	0.330" (8.4mm)
Operating Temperature Range	-40°C to 85°C	-40°C to 120°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Electrical Life	100,000 Cycles	100,000 Cycles	Not Specified	Not Specified	Not Specified	Not Specified	Not Specified	Not Specified	Not Specified
Mechanical Life	Not Specified	15,000,000 Cycles	10,000,000 Cycles	10,000,000 Cycles	10,000,000 Cycles	10,000,000 Cycles	10,000,000 Cycles	10,000,000 Cycles	1,000,000 Cycles
RoHS Status	Non-Compliant	RoHS3 Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (Preferred): DB3C-A1AA is the primary substitute for DA3C-D1AA. Both parts share identical electrical ratings (100mA AC at 125V) and mechanical specifications (0.330" operating position, round pin plunger, chassis mount, solder lug termination). DB3C-A1AA is active status and RoHS3 compliant, addressing regulatory requirements that the obsolete DA3C-D1AA does not meet. The improved mechanical life specification (15,000,000 cycles versus unspecified) provides enhanced reliability.

For Higher Capacity Applications: Honeywell 11SM series parts (11SM423, 11SM3, 11SM244, 11SM401, 11SM701, 11SM703) and 12SM4 are suitable when circuit design permits higher current ratings. These parts maintain identical mechanical form factors and switch function but provide current ratings from 1A to 5A AC. All are RoHS compliant and active status. Selection within this group depends on specific voltage and current requirements:

11SM423 and 12SM4: 1A AC at 125V (closest to original current rating)
11SM401 and 11SM3: 5A AC/DC at 250V/30V
11SM244: 5A AC at 250V, 300mA DC at 125V
11SM701 and 11SM703: 4A AC at 250V, 5A DC at 30V

All substitute parts operate within or exceed the original -40°C to 85°C temperature range, with extended ranges to -55°C to 125°C for Honeywell parts.

Frequently Asked Questions (FAQ)

Q: Can DB3C-A1AA directly replace DA3C-D1AA without circuit modification? A: Yes. DB3C-A1AA maintains identical electrical ratings (100mA AC at 125V), mechanical specifications (0.330" operating position), and termination style (solder lug). Both are SPDT On-Mom switches with round pin plunger actuators and chassis mount configuration. No circuit redesign is required.

Q: What is the primary advantage of using DB3C-A1AA over the original DA3C-D1AA? A: DB3C-A1AA is active status with RoHS3 compliance, whereas DA3C-D1AA is obsolete and RoHS non-compliant. DB3C-A1AA also specifies 15,000,000 mechanical life cycles compared to the unspecified mechanical life of DA3C-D1AA, providing documented reliability improvement.

Q: Can Honeywell 11SM series parts substitute for DA3C-D1AA? A: Honeywell 11SM series parts are mechanically and functionally compatible (SPDT, On-Mom, round pin plunger, chassis mount, solder lug, 0.330" operating position) but have higher current ratings (1A to 5A AC). They are suitable substitutes only if the circuit design accommodates the increased electrical capacity. These parts are RoHS compliant and active status.

Q: Which substitute part should be selected for new designs? A: DB3C-A1AA is recommended for new designs requiring 100mA AC at 125V. For applications requiring higher current capacity, select from the Honeywell 11SM series based on specific voltage and current requirements. All recommended substitutes are active status and RoHS compliant.

Q: Are there packaging differences between DA3C-D1AA and its substitutes? A: DB3C-A1AA is supplied in bulk packaging. Honeywell 11SM series parts are supplied in bulk packaging, with 11SM2440 supplied without specified packaging. All parts maintain identical mechanical form factors and mounting specifications, ensuring interchangeability in chassis mount applications.

Q: What is the operating temperature range difference between DA3C-D1AA and substitute parts? A: DA3C-D1AA operates from -40°C to 85°C. DB3C-A1AA extends this to -40°C to 120°C. Honeywell 11SM series parts operate from -55°C to 125°C, providing wider temperature envelope coverage for demanding environments.

Q: Do all substitute parts meet RoHS compliance requirements? A: DB3C-A1AA is RoHS3 compliant. All Honeywell 11SM series parts and 12SM4 are RoHS compliant. The original DA3C-D1AA is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed substitutes are acceptable.

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