STDCSW2-40M Equivalent & Substitute Parts

Part Overview

The STDCSW2-40M is a 40 MHz fundamental mode crystal oscillator manufactured by NDK America, Inc., designed for surface mount applications in a 4-SMD, No Lead package. This active product operates across -10°C to 60°C with ±10ppm frequency stability and 10pF load capacitance. Substitute parts are identified to address inventory availability, packaging format preferences, or specific load capacitance requirements while maintaining core electrical and mechanical compatibility.

Substiute Parts

STDCSW2-40M

NDK America, Inc.In Stock: 1126STDCSW2-40M Datasheet

Current PartRFQ

R2520-40.000-12-F-1010-TR

Raltron ElectronicsIn Stock: 1700R2520-40.000-12-F-1010-TR Datasheet

SimilarRFQ

R2520-40.000-8-F-1010-TR

Raltron ElectronicsIn Stock: 3932R2520-40.000-8-F-1010-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STDCSW2-40M is determined by the following criteria:

Core Electrical Parameters (Non-Negotiable):

• Frequency: 40 MHz
• Frequency Stability: ±10ppm
• Operating Mode: Fundamental
• Operating Temperature Range: -10°C to 60°C

Mechanical Parameters (Non-Negotiable):

• Package / Case: 4-SMD, No Lead
• Size / Dimension: 0.098" L x 0.079" W (2.50mm x 2.00mm)
• Height - Seated (Max): 0.026" (0.65mm)
• Mounting Type: Surface Mount

Variable Parameters (Allowed Substitution Range):

• Load Capacitance: 8pF to 12pF
• ESR (Equivalent Series Resistance): 40 to 60 Ohms
• Packaging Format: Tape & Reel (TR) or Cut Tape (CT)

The identified substitute parts maintain identical frequency, stability, operating mode, temperature range, and mechanical dimensions. Variations in load capacitance and ESR are within acceptable tolerances for this crystal category.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status and meet RoHS compliance requirements. The STDCSW2-40M and both Raltron substitutes are electrically and mechanically compatible for 40 MHz fundamental mode crystal applications.

R2520-40.000-12-F-1010-TR (Raltron): Load capacitance of 12pF represents a 2pF increase from the main part. This substitute is suitable for applications where the circuit design accommodates higher load capacitance. Available in Cut Tape packaging format.

R2520-40.000-8-F-1010-TR (Raltron): Load capacitance of 8pF represents a 2pF decrease from the main part. This substitute is suitable for applications where the circuit design accommodates lower load capacitance. Available in Tape & Reel packaging format, matching the main part's packaging preference.

Both Raltron parts carry ROHS3 compliance and REACH Unaffected status, providing additional regulatory documentation compared to the NDK part's RoHS Compliant designation.

Frequently Asked Questions (FAQ)

Q: Can R2520-40.000-12-F-1010-TR replace STDCSW2-40M directly?

A: Electrical and mechanical compatibility is maintained. The 12pF load capacitance differs from the 10pF specification. Circuit design must accommodate this load capacitance value. Verify oscillator circuit design parameters before substitution.

Q: What is the significance of the load capacitance difference?

A: Load capacitance affects the crystal's operating frequency in the circuit. The STDCSW2-40M is specified for 10pF load. The R2520-40.000-12-F-1010-TR operates at 12pF load, and the R2520-40.000-8-F-1010-TR operates at 8pF load. Circuit design must match the crystal's load capacitance specification.

Q: Are there differences in ESR between the parts?

A: The STDCSW2-40M has 40 Ohms ESR, while both Raltron substitutes have 60 Ohms ESR. This 20 Ohm difference may affect circuit performance in applications sensitive to crystal impedance characteristics.

Q: What packaging formats are available?

A: STDCSW2-40M is supplied in Tape & Reel (TR) format. R2520-40.000-12-F-1010-TR is available in Cut Tape (CT) format. R2520-40.000-8-F-1010-TR is available in Tape & Reel (TR) format.

Q: Are all parts RoHS compliant?

A: Yes. STDCSW2-40M is RoHS Compliant. Both Raltron parts are ROHS3 Compliant. All parts meet RoHS requirements.

Q: Do the substitute parts have the same physical dimensions?

A: Yes. All three parts share identical dimensions: 0.098" L x 0.079" W (2.50mm x 2.00mm) with maximum seated height of 0.026" (0.65mm). All use 4-SMD, No Lead package configuration.