K1200S Equivalent & Substitute Parts

Part Overview

The K1200S is a SIDAC (Silicon Diode for Alternating Current) thyristor manufactured by Littelfuse Inc., classified as a Diac/Sidac thyristor device in the DO-214 package. This component is designed for applications requiring breakover voltage triggering in the 110–125V range with 1A peak output capability. The K1200S is currently listed as obsolete, making identification of equivalent substitute parts essential for ongoing system support and new design implementations where this device specification remains applicable.

Substiute Parts

K1200S

Littelfuse Inc.In Stock: 1022K1200S Datasheet

Current PartRFQ

K1200SRP

Littelfuse Inc.In Stock: 5319K1200SRP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the K1200S is determined by strict equivalence across the following critical parameters:

• Voltage - Breakover: Must match 110 ~ 125V specification
• Current - Breakover: Must match 10 µA specification
• Current - Hold (Ih) (Max): Must match 150 mA specification
• Current - Peak Output: Must match 1 A specification
• Operating Temperature Range: Must support -40°C ~ 125°C (TJ)
• Package / Case: Must be DO-214AA, SMB compatible
• Supplier Device Package: Must be DO-214

The K1200SRP is identified as a direct substitute based on identical electrical characteristics and mechanical compatibility across all specified parameters. The primary distinction is packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The K1200SRP is the direct equivalent substitute for the K1200S. Both components are manufactured by Littelfuse Inc. and maintain identical electrical and mechanical specifications across all critical parameters. The K1200SRP is currently in active production status, whereas the K1200S is obsolete. Both components meet ROHS3 compliance requirements and are suitable for applications requiring 110–125V breakover voltage thyristor functionality in DO-214 packaging.

Selection between these parts is determined by packaging requirements: the K1200S is supplied in bulk format, while the K1200SRP is supplied in Tape & Reel (TR) format. For high-volume manufacturing and automated assembly processes, the K1200SRP in Tape & Reel format is the preferred choice due to active product status and standard industry packaging conventions.

Frequently Asked Questions (FAQ)

Q: Can the K1200SRP directly replace the K1200S in existing designs?

A: Yes. The K1200SRP is electrically and mechanically equivalent to the K1200S. All critical parameters—breakover voltage, breakover current, hold current, peak output current, operating temperature range, and package type—are identical. The only difference is packaging format (Tape & Reel versus bulk) and product status (active versus obsolete).

Q: What is the significance of the product status difference between K1200S and K1200SRP?

A: The K1200S is classified as obsolete, indicating it is no longer in active production. The K1200SRP maintains active production status, ensuring continued availability and supply chain reliability for new designs and ongoing system support.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the K1200S and K1200SRP are ROHS3 compliant and carry identical regulatory classifications (ECCN: EAR99, HTSUS: 8541.30.0080).

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR) packaging and bulk packaging do not affect electrical performance. The packaging format is a logistics and manufacturing consideration. Tape & Reel format is standard for automated assembly processes, while bulk packaging is used for manual assembly or lower-volume applications.

Q: What parameters must match for a part to be considered a valid substitute?

A: For SIDAC thyristor substitution, the following parameters must match exactly: breakover voltage (110–125V), breakover current (10 µA), hold current maximum (150 mA), peak output current (1 A), operating temperature range (-40°C to 125°C), and package type (DO-214AA, SMB). Any deviation in these specifications disqualifies a part as a direct equivalent.