SD12H0B DIP Switch SPST 12 Position Equivalent & Substitute Parts

Part Overview

The SD12H0B is an active-status DIP switch manufactured by C&K, featuring SPST circuit configuration with 12 positions. This component is rated for 100mA at 25VDC and utilizes a slide actuator with standard flush/recessed actuation level. The part is designed for through-hole mounting with 0.100" pitch and gold-plated beryllium copper contacts. Substitute parts may be required due to inventory constraints, application-specific voltage or current requirements, or actuator type preferences while maintaining core switching functionality.

Key Parameters

Parameter	SD12H0B (C&K)
Circuit Type	SPST
Number of Positions	12
Current Rating	100mA
Voltage Rating	25VDC
Actuator Type	Slide (Standard)
Mounting Type	Through Hole
Pitch	0.100" (2.54mm)
Contact Material	Beryllium Copper
Contact Finish	Gold
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SD12H0B is determined by the following critical parameters: SPST circuit configuration, 12-position count, through-hole mounting with 0.100" pitch, and operating temperature range of -40°C to 85°C. Substitute parts must maintain these core specifications to ensure functional compatibility in the target application.

Voltage and current ratings are application-dependent. Parts with equal or higher voltage and current ratings can substitute for the SD12H0B in applications operating within the original design envelope. Actuator type (slide versus rocker) represents a mechanical interface difference; selection depends on PCB layout and user actuation preference. Contact material and finish variations are acceptable provided gold plating is maintained for reliability.

Parameter Comparison

Parameter	SD12H0B (C&K)	209-12LPST (CTS)	76RSB12ST (Grayhill)	76RSB12T (Grayhill)
Manufacturer	C&K	CTS Electrocomponents	Grayhill Inc.	Grayhill Inc.
Circuit Type	SPST	SPST	SPST	SPST
Number of Positions	12	12	12	12
Current Rating	100mA	100mA	150mA	150mA
Voltage Rating	25VDC	20VDC	30VDC	30VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Rocker	Rocker
Actuator Level	Flush, Recessed	Flush, Recessed	Flush, Recessed	Flush, Recessed
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Finish	Gold	Gold	Gold	Gold
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Electrical Life	2,000 Cycles	2,000 Cycles	2,000 Cycles	2,000 Cycles
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The 209-12LPST (CTS Electrocomponents) is functionally equivalent to the SD12H0B for applications operating at or below 20VDC and 100mA. Both parts share identical actuator type (slide), pitch, and electrical life specifications. The 209-12LPST carries ROHS3 compliance and unlimited MSL rating, matching the original part's regulatory status. This substitute is suitable for direct replacement in slide-actuator applications with voltage requirements not exceeding 20VDC.

The 76RSB12ST and 76RSB12T (Grayhill Inc.) provide higher current (150mA) and voltage (30VDC) ratings, making them suitable for applications requiring greater electrical headroom than the SD12H0B. Both parts maintain ROHS3 compliance, unlimited MSL, and identical pitch and operating temperature range. The primary difference between these Grayhill options is actuator type: 76RSB12ST features a rocker actuator with tape seal and washable design, while 76RSB12T uses a rocker actuator without washable specification. Selection between rocker-actuated substitutes depends on PCB layout constraints and mechanical actuation requirements, as rocker actuators have a different height above board (0.292") compared to the slide actuator (0.178").

All substitute parts maintain SPST circuit configuration, 12-position count, through-hole mounting, and gold-plated contacts. Regulatory compliance (ROHS3, REACH Unaffected, EAR99 ECCN) is consistent across all options.

Frequently Asked Questions (FAQ)

Q: Can the 209-12LPST replace the SD12H0B in a 25VDC application?

A: No. The 209-12LPST is rated for 20VDC maximum, while the SD12H0B is rated for 25VDC. Using the 209-12LPST in a 25VDC circuit exceeds its voltage specification and is not recommended.

Q: What is the primary difference between the 76RSB12ST and 76RSB12T?

A: Both parts are identical in electrical specifications (150mA, 30VDC, SPST, 12 positions). The 76RSB12ST includes washable design and epoxy sealed terminals with tape seal, while the 76RSB12T does not specify washable capability and does not list additional sealing features.

Q: Can I use a rocker-actuated DIP switch (76RSB series) in place of a slide-actuated switch (SD12H0B)?

A: Rocker and slide actuators have different mechanical profiles and heights above board. The 76RSB12ST and 76RSB12T have a height of 0.292" compared to the SD12H0B's 0.178". Substitution is possible only if PCB layout and mechanical clearance accommodate the taller rocker actuator profile.

Q: Are all substitute parts RoHS compliant?

A: Yes. The SD12H0B, 209-12LPST, 76RSB12ST, and 76RSB12T are all ROHS3 compliant with unlimited MSL rating and REACH Unaffected status.

Q: Which substitute part has the highest current and voltage ratings?

A: The 76RSB12ST and 76RSB12T both provide 150mA at 30VDC, exceeding the SD12H0B's 100mA at 25VDC rating. These parts are suitable for applications requiring higher electrical capacity.

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