MLL1200S Equivalent & Substitute Parts

Part Overview

The MLL1200S is a slide switch manufactured by TE Connectivity ALCOSWITCH Switches, classified as a single-pole double-throw (SPDT) surface mount component with right-angle termination. This switch is rated for 300mA DC at 4V and features a 1.50mm actuator with gull wing termination suitable for surface mount assembly. The MLL1200S is currently listed as obsolete, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Substiute Parts

MLL1200S

TE Connectivity ALCOSWITCH SwitchesIn Stock: 916MLL1200S Datasheet

Current PartRFQ

CUS-12TB

Nidec Components CorporationIn Stock: 31895CUS-12TB Datasheet

SimilarRFQ

EG1257

E-SwitchIn Stock: 4053EG1257 Datasheet

SimilarRFQ

PCM12SMTR

C&KIn Stock: 5809PCM12SMTR Datasheet

SimilarRFQ

SK-12C0405-SG 1.5 RT

C&KIn Stock: 5373SK-12C0405-SG 1.5 RT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MLL1200S is determined by strict equivalence across the following critical parameters:

Primary Matching Criteria:

• Circuit configuration: SPDT
• Current rating: 300mA DC
• Voltage rating: 4V DC
• Mounting type: Surface mount, right angle
• Termination style: Gull wing
• Actuator length: 1.50mm
• Switch travel: 1.50mm
• Switch function: On-On

Secondary Compatibility Factors:

• Operating temperature range (minimum -20°C, maximum ≥70°C)
• Mechanical and electrical life ratings (≥10,000 cycles)
• RoHS3 compliance
• MSL rating of 1 or equivalent

The substitute parts listed below meet these core electrical and mechanical specifications. Variations in contact material finish, actuator material composition, and operating force are noted but do not preclude functional substitution when electrical and thermal requirements are satisfied.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Full Equivalence):

CUS-12TB (Nidec Components Corporation) and SK-12C0405-SG 1.5 RT (C&K) are the preferred substitutes. Both parts maintain identical electrical specifications (300mA at 4V DC), matching mechanical dimensions, and equivalent RoHS3 compliance with MSL 1 rating. CUS-12TB is currently in active production with substantial inventory availability (31,870 units). SK-12C0405-SG 1.5 RT is also active with 5,322 units in stock.

Secondary Substitutes (Minor Parameter Variance):

EG1257 (E-Switch) meets all core electrical and mechanical requirements with 10,000-cycle mechanical and electrical life ratings. This part is active with 3,946 units available. Operating temperature range is limited to -20°C to 70°C, which is acceptable for applications not requiring the full 85°C upper limit of the original MLL1200S.

Conditional Substitute (Voltage Rating Variance):

PCM12SMTR (C&K) is rated for 6V DC, exceeding the 4V requirement of the MLL1200S. This part is suitable for applications where the 4V specification is a minimum rather than a maximum constraint. PCM12SMTR maintains identical current rating, mounting configuration, and mechanical dimensions. Inventory availability is 5,709 units. Note that MSL rating is 2 (1 Year) rather than MSL 1.

All substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original component.

Frequently Asked Questions (FAQ)

Q: Can CUS-12TB directly replace MLL1200S in existing designs?

A: Yes. CUS-12TB matches all critical electrical parameters (300mA, 4V DC), mechanical dimensions (1.50mm actuator and travel), mounting configuration (surface mount right angle), and termination style (gull wing). Both parts are ROHS3 compliant with MSL 1 rating. The primary difference is contact finish (gold versus silver) and operating force (204gf versus 150gf), neither of which affects electrical function.

Q: What is the temperature limitation of EG1257 compared to MLL1200S?

A: EG1257 operates from -20°C to 70°C, while MLL1200S operates from -20°C to 85°C. The 15°C reduction in maximum operating temperature may be significant for applications in high-temperature environments. For applications operating below 70°C, this difference is not a functional constraint.

Q: Why is PCM12SMTR listed as a substitute if it has a 6V rating instead of 4V?

A: PCM12SMTR is included because it meets all other critical specifications and the 6V rating is a superset of the 4V requirement. A component rated for 6V can safely operate at 4V. This part is suitable for designs where voltage headroom is beneficial or where the 4V specification represents a minimum operating point.

Q: Are there packaging differences between these substitutes?

A: Yes. MLL1200S packaging is not specified in available data. CUS-12TB and PCM12SMTR are supplied in Cut Tape (CT) and Digi-Reel format. EG1257 and SK-12C0405-SG 1.5 RT are supplied in Tape & Reel (TR) format. Packaging selection depends on assembly line requirements and volume considerations.

Q: What does MSL 2 (1 Year) on PCM12SMTR mean for handling?

A: MSL 2 indicates the component must be used within one year of the manufacturing date if exposed to ambient conditions above 30°C and 85% relative humidity. MSL 1 (unlimited) parts like MLL1200S, CUS-12TB, EG1257, and SK-12C0405-SG 1.5 RT have no time-based storage restrictions. For standard manufacturing environments with controlled humidity, this difference is typically not operationally significant.

Q: Do all substitutes have the same mechanical life rating?

A: No. MLL1200S, EG1257, and PCM12SMTR specify 10,000 mechanical cycles. CUS-12TB and SK-12C0405-SG 1.5 RT do not specify mechanical life in available data. All parts specify or match 10,000 electrical cycles. For applications requiring documented mechanical life specifications, EG1257 and PCM12SMTR provide explicit ratings.

Q: Which substitute has the best inventory availability?

A: CUS-12TB has the highest inventory with 31,870 units in stock, followed by PCM12SMTR (5,709 units), SK-12C0405-SG 1.5 RT (5,322 units), and EG1257 (3,946 units). For high-volume production requirements, CUS-12TB offers the most reliable supply position.