STDCSF4-25M 25 MHz Crystal Equivalent & Substitute Parts

Part Overview

The STDCSF4-25M is a 25 MHz fundamental mode crystal oscillator manufactured by NDK America, Inc., designed for surface mount applications. This component operates at 25.0000 MHz with ±20ppm frequency tolerance and 8pF load capacitance. The part is classified as "Not For New Designs," indicating it has been superseded in NDK's product portfolio. For new applications or when STDCSF4-25M inventory becomes unavailable, equivalent substitute parts meeting identical electrical and mechanical specifications are necessary to maintain circuit functionality and design compatibility.

Substiute Parts

STDCSF4-25M

NDK America, Inc.In Stock: 882STDCSF4-25M Datasheet

Current PartRFQ

STDCSK4-25M

NDK America, Inc.In Stock: 42861STDCSK4-25M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STDCSF4-25M is determined by strict equivalence across the following critical parameters:

• Frequency: 25 MHz (exact match required)
• Frequency Tolerance: ±20ppm (exact match required)
• Load Capacitance: 8pF (exact match required)
• ESR: 50 Ohms (exact match required)
• Operating Mode: Fundamental (exact match required)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)
• Package / Case: 2-SMD, No Lead (exact match required)
• RoHS Compliance: Required

The STDCSK4-25M meets all substitution criteria. While physical dimensions differ (smaller footprint: 5.00mm x 3.20mm vs. 8.00mm x 4.50mm), both parts maintain identical electrical performance and are compatible with standard SMD assembly processes. The STDCSK4-25M is classified as "Active" product status, ensuring continued availability and support.

Parameter Comparison

Engineering Selection Recommendations

The STDCSK4-25M is the direct equivalent substitute for the STDCSF4-25M. Both parts are manufactured by NDK America, Inc., and maintain identical electrical specifications across all critical parameters: 25 MHz frequency, ±20ppm tolerance, 8pF load capacitance, and 50 Ohm ESR. Both are RoHS Compliant with MSL 1 rating.

The primary distinction is product status: STDCSF4-25M is classified as "Not For New Designs," while STDCSK4-25M is Active. For new circuit designs or when STDCSF4-25M inventory is depleted, STDCSK4-25M is the appropriate selection. The smaller physical footprint of STDCSK4-25M (5.00mm x 3.20mm vs. 8.00mm x 4.50mm) may require PCB layout adjustment but does not affect electrical performance or circuit compatibility.

Frequently Asked Questions (FAQ)

Q: Can STDCSK4-25M be used as a direct replacement for STDCSF4-25M in existing designs?

A: Yes. Both parts meet identical electrical specifications: 25 MHz frequency, ±20ppm tolerance, 8pF load capacitance, 50 Ohm ESR, and -10°C ~ 70°C operating temperature. PCB layout modifications may be necessary due to the smaller footprint of STDCSK4-25M (5.00mm x 3.20mm vs. 8.00mm x 4.50mm), but electrical functionality remains unchanged.

Q: Why is STDCSF4-25M marked "Not For New Designs"?

A: This designation indicates the part has been superseded in NDK's product line. STDCSK4-25M is the active equivalent offering identical performance with continued manufacturer support and availability.

Q: Are there any compliance differences between these parts?

A: No. Both parts are RoHS Compliant with MSL 1 (Unlimited) rating and identical ECCN and HTSUS classifications.

Q: What is the primary difference between STDCSF4-25M and STDCSK4-25M?

A: The primary difference is physical size. STDCSF4-25M uses the NX8045GB series package (8.00mm x 4.50mm x 2.00mm), while STDCSK4-25M uses the NX5032GA series package (5.00mm x 3.20mm x 1.50mm). All electrical parameters are identical.

Q: Can I use STDCSK4-25M in a design originally specified for STDCSF4-25M?

A: Yes, provided PCB layout accommodates the smaller footprint. Electrical compatibility is complete across all operating parameters and temperature ranges.