STDCSF4-20M 20 MHz Crystal Equivalent & Substitute Parts

Part Overview

The STDCSF4-20M is a 20 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 STDCSF4-20M is classified as Not For New Designs, indicating end-of-life status. Identifying equivalent substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where this frequency and electrical specification are required.

Substiute Parts

STDCSF4-20M

NDK America, Inc.In Stock: 907STDCSF4-20M Datasheet

Current PartRFQ

STDCSK4-20M

NDK America, Inc.In Stock: 10331STDCSK4-20M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STDCSF4-20M is determined by strict equivalence across the following critical parameters:

• Frequency: 20 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
• MSL Rating: 1 (Unlimited) (exact match required)

The STDCSK4-20M meets all substitution criteria. While it differs in physical dimensions (smaller footprint: 5.00mm x 3.20mm vs. 8.00mm x 4.50mm) and series designation (NX5032GA vs. NX8045GB), these dimensional differences do not affect electrical performance or functional compatibility when the PCB layout accommodates the smaller package size. The substitute part maintains identical electrical specifications and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The STDCSK4-20M is a direct electrical equivalent to the STDCSF4-20M. Both parts are manufactured by NDK America, Inc., and maintain identical electrical specifications, frequency characteristics, and compliance certifications. The STDCSK4-20M carries Active product status, ensuring continued availability and manufacturing support, whereas the STDCSF4-20M is classified as Not For New Designs.

Selection of the STDCSK4-20M is appropriate for applications requiring the specified 20 MHz frequency, 8pF load capacitance, and ±20ppm tolerance. The smaller physical footprint of the STDCSK4-20M (NX5032GA package) requires verification that PCB layout and component placement accommodate the reduced dimensions. Both parts satisfy RoHS compliance and MSL Level 1 requirements.

Frequently Asked Questions (FAQ)

Q: Can the STDCSK4-20M replace the STDCSF4-20M in existing designs?

A: Yes, provided PCB layout accommodates the smaller package dimensions. The STDCSK4-20M measures 5.00mm x 3.20mm x 1.50mm compared to the STDCSF4-20M at 8.00mm x 4.50mm x 2.00mm. All electrical parameters, frequency specifications, and operating characteristics are identical.

Q: What is the primary reason to substitute the STDCSF4-20M?

A: The STDCSF4-20M is classified as Not For New Designs, indicating end-of-life status. The STDCSK4-20M is an Active product with ongoing manufacturing support and availability.

Q: Are there any compliance differences between these parts?

A: No. Both parts are RoHS Compliant, carry MSL Level 1 (Unlimited) ratings, and share identical ECCN and HTSUS classifications.

Q: What are the critical parameters that must match for substitution?

A: Frequency (20 MHz), frequency tolerance (±20ppm), load capacitance (8pF), ESR (50 Ohms), operating mode (Fundamental), operating temperature range (-10°C ~ 70°C), package type (2-SMD, No Lead), and compliance certifications must all match exactly.

Q: Does the smaller package size affect electrical performance?

A: No. Package size differences do not affect the electrical characteristics or frequency stability of the crystal. PCB layout compatibility is the only consideration.