19.6608 MHz Crystal 18pF SMD (9C19600018) Equivalent & Substitute Parts

Part Overview

The TXC CORPORATION 9C19600018 is a 19.6608 MHz fundamental mode crystal oscillator in HC-49/US surface mount package with 18pF load capacitance and 30 Ohms equivalent series resistance. This component is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure supply chain availability for applications requiring this specific frequency and electrical characteristics.

Substiute Parts

9C19600018

TXC CORPORATIONIn Stock: 7739C19600018 Datasheet

Current PartRFQ

ECS-196.6-20-3X-EN-TR

ECS Inc.In Stock: 830ECS-196.6-20-3X-EN-TR Datasheet

SimilarRFQ

LP19BF35IDT

CTS-Frequency ControlsIn Stock: 1017LP19BF35IDT Datasheet

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LP19BF35IET

CTS-Frequency ControlsIn Stock: 1157LP19BF35IET Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 9C19600018 is determined by the following critical parameters:

Primary Matching Criteria:

• Frequency: 19.6608 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Package / Case: HC-49/US (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)

Secondary Compatibility Parameters:

• Load Capacitance: 18pF or 20pF (within acceptable circuit design tolerance)
• ESR: 30 Ohms to 50 Ohms (acceptable range for circuit operation)
• RoHS Status: ROHS3 Compliant (regulatory requirement)
• Moisture Sensitivity Level: 1 (Unlimited) (handling and storage compatibility)

Substitute parts are grouped into two categories based on load capacitance: 18pF direct equivalents and 20pF functional equivalents. Both categories maintain identical frequency, tolerance, package, and temperature specifications.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (18pF Load Capacitance):

LP19BF35IDT from CTS-Frequency Controls is the direct electrical equivalent to 9C19600018. This part maintains identical load capacitance (18pF), frequency (19.6608 MHz), tolerance (±30ppm), and operating temperature range (-40°C ~ 85°C). The ESR specification of 40 Ohms is within acceptable operational range compared to the original 30 Ohms. Product status is Active, ensuring long-term availability. ROHS3 compliance and MSL 1 rating match the original specification. This substitute is recommended for applications where load capacitance matching is critical to circuit design.

Functional Equivalent (20pF Load Capacitance):

LP19BF35IET from CTS-Frequency Controls and ECS-196.6-20-3X-EN-TR from ECS Inc. are functional equivalents with 20pF load capacitance. Both maintain identical frequency, tolerance, and operating temperature specifications. ESR values of 40 Ohms (CTS) and 50 Ohms (ECS) are within acceptable range. Both parts carry Active product status and ROHS3 compliance. These substitutes are suitable for applications where 20pF load capacitance is compatible with circuit design parameters.

Compliance and Regulatory Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with current manufacturing and handling standards. ECS-196.6-20-3X-EN-TR is REACH Unaffected, while LP19BF35IDT and LP19BF35IET are REACH Unaffected. All parts carry EAR99 ECCN classification and 8541.60.0050 HTSUS code.

Frequently Asked Questions (FAQ)

Q: Can LP19BF35IDT be used as a direct replacement for 9C19600018?

A: Yes. LP19BF35IDT matches all critical parameters: 19.6608 MHz frequency, ±30ppm tolerance, 18pF load capacitance, HC-49/US package, surface mount configuration, and -40°C ~ 85°C operating temperature. ESR difference (40 Ohms vs. 30 Ohms) is within acceptable operational tolerance for most circuit applications.

Q: What is the difference between the 18pF and 20pF load capacitance substitutes?

A: Load capacitance determines the crystal's resonant frequency in the circuit. The 18pF variants (9C19600018 and LP19BF35IDT) are direct electrical equivalents. The 20pF variants (LP19BF35IET and ECS-196.6-20-3X-EN-TR) require circuit design verification to ensure frequency stability remains within ±30ppm tolerance. Selection depends on circuit load capacitance specifications.

Q: Are all substitute parts available in tape and reel packaging?

A: Yes. LP19BF35IDT, LP19BF35IET, and ECS-196.6-20-3X-EN-TR are all supplied in Tape & Reel (TR) packaging. The original 9C19600018 is supplied in bulk packaging. Tape and reel packaging is standard for automated assembly processes.

Q: What is the significance of Product Status being "Obsolete" for 9C19600018?

A: Obsolete status indicates the part is no longer manufactured by TXC CORPORATION. All substitute parts carry Active product status, ensuring continued manufacturing and supply chain availability. This makes substitution necessary for new designs and long-term production continuity.

Q: Do all parts meet current regulatory requirements?

A: Yes. All parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. EAR99 ECCN and 8541.60.0050 HTSUS classifications are consistent across all parts, ensuring regulatory compliance for export and manufacturing.

Q: What is the ESR difference between the main part and substitutes?

A: The original 9C19600018 has 30 Ohms ESR. LP19BF35IDT has 40 Ohms, LP19BF35IET has 40 Ohms, and ECS-196.6-20-3X-EN-TR has 50 Ohms. ESR affects crystal impedance and circuit startup characteristics. The higher ESR values in substitutes are within acceptable range for standard crystal oscillator circuits operating at 19.6608 MHz.

Q: Can ECS-196.6-20-3X-EN-TR be used interchangeably with CTS parts?

A: ECS-196.6-20-3X-EN-TR is functionally equivalent to LP19BF35IET (both 20pF load capacitance). Both maintain identical frequency, tolerance, and operating temperature. The primary difference is manufacturer and ESR specification (50 Ohms vs. 40 Ohms). Selection depends on circuit design requirements and supplier availability.