K0900S Equivalent & Substitute Parts

Part Overview

The K0900S 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 control in the 79–97V range with 1A peak output capability. The K0900S is currently listed as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

K0900S

Littelfuse Inc.In Stock: 788K0900S Datasheet

Current PartRFQ

K0900SRP

LittelfuseIn Stock: 728K0900SRP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the K0900S is determined by strict electrical and mechanical parameter matching:

Critical Matching Parameters:

• Voltage - Breakover: 79 ~ 97V (exact range match required)
• Current - Peak Output: 1 A (exact match required)
• Package / Case: DO-214AA, SMB (mechanical compatibility required)
• Operating Temperature Range: -40°C ~ 125°C (TJ) (minimum coverage required)

The K0900SRP qualifies as a direct substitute based on identical electrical specifications across all critical parameters and compatible packaging. The primary distinction is packaging format: K0900SRP is supplied in Tape & Reel (TR) configuration versus the standard packaging of the K0900S, and K0900SRP maintains Active product status.

Parameter Comparison

Engineering Selection Recommendations

The K0900SRP is the qualified substitute for the K0900S based on the following engineering criteria:

Electrical Compatibility: All critical electrical parameters—breakover voltage (79–97V), breakover current (10 µA), hold current (150 mA maximum), and peak output current (1 A)—are identical between the two parts. Operating temperature range coverage is equivalent at -40°C to 125°C (TJ).

Mechanical Compatibility: Both parts utilize the DO-214AA/SMB package, ensuring direct physical and functional interchangeability in existing circuit designs and PCB layouts.

Compliance & Certification: Both parts maintain ROHS3 compliance, satisfying regulatory requirements for new designs and legacy system support.

Product Status Advantage: K0900SRP carries Active product status, ensuring continued availability and manufacturer support, whereas K0900S is obsolete. For new designs or system refreshes, K0900SRP is the appropriate selection.

Packaging Consideration: K0900SRP is supplied in Tape & Reel (TR) format, which is standard for high-volume manufacturing and automated assembly processes. If bulk quantities or automated handling are required, this packaging format provides operational advantages.

Frequently Asked Questions (FAQ)

Q: Can K0900SRP be used as a direct replacement for K0900S in existing designs?

A: Yes. K0900SRP is electrically and mechanically identical to K0900S across all critical parameters: breakover voltage, breakover current, hold current, peak output current, operating temperature range, and package type (DO-214AA/SMB). The parts are functionally interchangeable.

Q: What is the primary difference between K0900S and K0900SRP?

A: The primary differences are product status and packaging format. K0900S is obsolete, while K0900SRP is active. K0900SRP is supplied in Tape & Reel (TR) packaging, which is optimized for automated assembly and high-volume production. Standard packaging for K0900S differs in handling and delivery format.

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

A: No. Both K0900S and K0900SRP are ROHS3 compliant and carry identical regulatory classifications (ECCN: EAR99, HTSUS: 8541.30.0080).

Q: Why is K0900S listed as obsolete?

A: K0900S has reached end-of-life status. K0900SRP, the active equivalent, is the recommended part for all new designs and ongoing system support.

Q: Is the DO-214AA/SMB package compatible with existing PCB layouts designed for K0900S?

A: Yes. Both parts use the same DO-214AA/SMB package, ensuring pin-for-pin and footprint compatibility with existing circuit board designs.

Q: What inventory status should be considered when selecting between these parts?

A: K0900SRP (621 Pcs in stock) is actively available. K0900S (759 Pcs in stock) is obsolete and should not be selected for new designs. For legacy system support requiring K0900S, existing inventory may be available, but K0900SRP is the preferred long-term solution.