STDCSF4-24M 24 MHz Crystal Equivalent & Substitute Parts

Part Overview

The STDCSF4-24M is a 24 MHz fundamental mode crystal manufactured by NDK America, Inc., designed for surface mount applications in 2-SMD, No Lead packaging. This part operates at ±20ppm frequency tolerance with 8pF load capacitance and 50 Ohms equivalent series resistance. The STDCSF4-24M is classified as Not For New Designs, making identification of active equivalent alternatives essential for ongoing production and new design initiatives. Substitute parts must maintain identical electrical specifications and compatible mechanical dimensions to ensure direct replacement capability.

Substiute Parts

STDCSF4-24M

NDK America, Inc.In Stock: 1159STDCSF4-24M Datasheet

Current PartRFQ

STDCSK4-24M

NDK America, Inc.In Stock: 814STDCSK4-24M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STDCSF4-24M is determined by strict equivalence across the following critical parameters:

Frequency and Tolerance: Both the main part and substitute must operate at 24 MHz with ±20ppm frequency tolerance to maintain circuit timing specifications.

Load Capacitance and ESR: The 8pF load capacitance and 50 Ohms ESR are circuit-dependent values that must remain constant for oscillator stability and startup characteristics.

Operating Mode: Fundamental mode operation is required; no overtone or other operating modes are acceptable.

Operating Temperature Range: The -10°C to 70°C range must be supported to ensure reliability across specified environmental conditions.

Package and Mounting: Surface mount 2-SMD, No Lead packaging ensures mechanical and electrical compatibility with existing PCB designs.

Compliance Standards: RoHS compliance and MSL rating must be maintained for regulatory and manufacturing process requirements.

The STDCSK4-24M meets all these criteria and qualifies as a direct substitute for the STDCSF4-24M.

Parameter Comparison

Engineering Selection Recommendations

The STDCSK4-24M is the qualified substitute for the STDCSF4-24M based on electrical parameter equivalence and compliance alignment. The STDCSF4-24M carries a Not For New Designs status, whereas the STDCSK4-24M is classified as Active, making it the appropriate choice for ongoing production and new design implementations.

Both parts maintain identical electrical specifications: 24 MHz frequency, ±20ppm tolerance, 8pF load capacitance, and 50 Ohms ESR. Both are RoHS compliant with MSL rating 1 (Unlimited), satisfying regulatory and manufacturing requirements.

The STDCSK4-24M utilizes a smaller physical footprint (5.00mm x 3.20mm versus 8.00mm x 4.50mm) and reduced height (1.50mm versus 2.00mm), offering potential PCB layout advantages while maintaining full electrical compatibility. Both parts employ identical 2-SMD, No Lead surface mount packaging.

Selection of the STDCSK4-24M is supported by its active product status and equivalent electrical performance across all critical parameters.

Frequently Asked Questions (FAQ)

Q: Can the STDCSK4-24M directly replace the STDCSF4-24M in existing designs?

A: Yes. Both parts share identical electrical specifications: 24 MHz frequency, ±20ppm tolerance, 8pF load capacitance, 50 Ohms ESR, and fundamental operating mode. Both employ 2-SMD, No Lead surface mount packaging and operate across the -10°C to 70°C temperature range. The STDCSK4-24M features a smaller physical footprint but maintains full electrical compatibility.

Q: What are the physical differences between these parts?

A: The STDCSF4-24M measures 8.00mm x 4.50mm with 2.00mm maximum seated height. The STDCSK4-24M measures 5.00mm x 3.20mm with 1.50mm maximum seated height. Both use identical 2-SMD, No Lead packaging. The smaller dimensions of the STDCSK4-24M may provide PCB layout flexibility without affecting electrical performance.

Q: Are both parts RoHS compliant?

A: Yes. Both the STDCSF4-24M and STDCSK4-24M are RoHS compliant with MSL rating 1 (Unlimited), meeting regulatory requirements for manufacturing and environmental standards.

Q: Why is the STDCSF4-24M marked as Not For New Designs?

A: The STDCSF4-24M carries a Not For New Designs status, indicating it is being phased out. The STDCSK4-24M, classified as Active, is the recommended alternative for new design implementations and ongoing production.

Q: Do these parts require different circuit design considerations?

A: No. Both parts operate at identical frequency, tolerance, load capacitance, and ESR values. Circuit design parameters remain unchanged when substituting the STDCSK4-24M for the STDCSF4-24M.