19.6608 MHz Crystal 18pF SMD (9C19600007) Equivalent & Substitute Parts

Part Overview

The TXC CORPORATION 9C19600007 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 part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for direct board-level substitution.

Substiute Parts

9C19600007

TXC CORPORATIONIn Stock: 9929C19600007 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 validity for 19.6608 MHz crystal oscillators is determined by the following parameters:

Mandatory Matching Parameters:

• Frequency: 19.6608 MHz (exact match required)
• Frequency Tolerance: ±30ppm (substitute must meet or exceed this specification)
• Package / Case: HC-49/US (physical and electrical interface requirement)
• Mounting Type: Surface Mount (assembly compatibility)
• Operating Temperature Range: -40°C ~ 85°C (environmental specification)

Load Capacitance Consideration: Load capacitance (18pF or 20pF) affects circuit oscillation characteristics. Substitutes with different load capacitance values require circuit validation but are listed as alternatives when other parameters align.

ESR (Equivalent Series Resistance) Consideration: ESR values between 30 Ohms and 50 Ohms are within acceptable range for HC-49/US crystals. Variations in ESR affect drive level requirements but do not preclude substitution when load capacitance and frequency parameters are compatible.

Regulatory Compliance: All substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with the original part.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute - Exact Load Capacitance Match: LP19BF35IDT (CTS-Frequency Controls) is the preferred substitute when the circuit design specifies 18pF load capacitance. This part maintains identical load capacitance to the original 9C19600007, ensuring circuit oscillation characteristics remain unchanged. The part is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Secondary Substitutes - Alternative Load Capacitance: LP19BF35IET (CTS-Frequency Controls) and ECS-196.6-20-3X-EN-TR (ECS Inc.) both feature 20pF load capacitance instead of 18pF. These parts are suitable for applications where the circuit design accommodates 20pF load capacitance or where load capacitance adjustment is feasible. Both parts maintain active production status and full regulatory compliance.

Substitution Validity Basis: All three substitute parts satisfy the mandatory matching parameters: identical 19.6608 MHz frequency, ±30ppm frequency tolerance, HC-49/US package, surface mount configuration, and -40°C to 85°C operating temperature range. ESR variations (40 Ohms to 50 Ohms versus original 30 Ohms) fall within acceptable operational range for this crystal package category.

Frequently Asked Questions (FAQ)

Q: Can LP19BF35IET be used as a direct replacement for 9C19600007? A: LP19BF35IET is electrically compatible with 9C19600007 for frequency and tolerance specifications. However, it features 20pF load capacitance versus the original 18pF. Direct substitution is valid only if the circuit design accommodates 20pF load capacitance or if load capacitance adjustment is performed.

Q: What is the significance of ESR differences between the original part and substitutes? A: ESR affects the drive level and power consumption of the crystal oscillator circuit. The original part specifies 30 Ohms ESR, while substitutes range from 40 to 50 Ohms. These variations are within acceptable range for HC-49/US package crystals and do not preclude substitution, though drive circuit parameters should be reviewed.

Q: Are all substitute parts available in the same packaging format? A: All substitute parts are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes. The original part packaging format is not specified in available data.

Q: Do all substitute parts meet the same regulatory requirements? A: Yes. All substitute parts are ROHS3 compliant, carry EAR99 export classification, and maintain HTSUS code 8541.60.0050 consistent with the original part. Moisture sensitivity level is MSL 1 (unlimited) for all parts.

Q: Which substitute should be selected for new designs? A: For new designs, either LP19BF35IDT (18pF load capacitance) or LP19BF35IET (20pF load capacitance) from CTS-Frequency Controls are recommended based on circuit load capacitance requirements. Both parts are in active production with established supply chains.

Q: Is load capacitance adjustment necessary when substituting with 20pF alternatives? A: Load capacitance affects oscillation frequency and circuit stability. If the original design specifies 18pF and a 20pF substitute is selected, circuit validation is required to confirm acceptable frequency deviation and oscillation margin.