9B11000003 Crystal Equivalent & Substitute Parts

Part Overview

The 9B11000003 is an 11.0592 MHz through-hole crystal manufactured by TXC CORPORATION, designed for fundamental mode operation with 18pF load capacitance and 40 Ohms equivalent series resistance. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and procurement planning. The part operates across the industrial temperature range of -40°C to 85°C and complies with ROHS3 and REACH regulations.

Key Parameters

Parameter	Value
Frequency	11.0592 MHz
Frequency Stability	±30ppm
Load Capacitance	18pF
ESR (Equivalent Series Resistance)	40 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-40°C to 85°C
Mounting Type	Through Hole
Package / Case	HC-49/US
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 9B11000003 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Frequency: 11.0592 MHz (exact match required)
Frequency Stability: ±30ppm (exact match required)
Load Capacitance: 18pF (exact match required)
Operating Mode: Fundamental (exact match required)
Operating Temperature Range: -40°C to 85°C (exact match required)
Package / Case: HC-49/US (exact match required)
Mounting Type: Through Hole (exact match required)

Allowable Variation Parameters:

ESR (Equivalent Series Resistance): Variation permitted within circuit design tolerance
Physical dimensions: Minor variations acceptable within HC-49/US standard envelope
Manufacturer: Different manufacturers acceptable if all mandatory parameters match
Product Status: Active status preferred for new procurement; obsolete status acceptable for legacy support

The substitute part HC49US-FF5F18-11.0592MHZ meets all mandatory matching criteria and is therefore classified as an equivalent substitute.

Parameter Comparison

Parameter	9B11000003 (TXC)	HC49US-FF5F18-11.0592MHZ (ILSI)	Match Status
Frequency	11.0592 MHz	11.0592 MHz	Equivalent
Frequency Stability	±30ppm	±30ppm	Equivalent
Frequency Tolerance	±30ppm	±30ppm	Equivalent
Load Capacitance	18pF	18pF	Equivalent
ESR	40 Ohms	60 Ohms	Variation Permitted
Operating Mode	Fundamental	Fundamental	Equivalent
Operating Temperature Range	-40°C to 85°C	-40°C to 85°C	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	HC-49/US	HC-49/US	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Obsolete	Active	Substitute is Active

Engineering Selection Recommendations

For New Designs and Procurement: The HC49US-FF5F18-11.0592MHZ (ILSI) is the recommended substitute for the obsolete 9B11000003. This part maintains full electrical and mechanical compatibility while offering active product status and current manufacturing availability. Both parts comply with ROHS3 standards and operate within identical frequency, stability, and temperature specifications.

For Legacy System Support: The 9B11000003 remains available in inventory (1109 pcs) for direct replacement in existing applications. However, transition to the HC49US-FF5F18-11.0592MHZ is advisable for long-term supply chain continuity.

ESR Consideration: The substitute part exhibits 60 Ohms ESR compared to the original 40 Ohms. This 20 Ohm difference falls within typical circuit design tolerances for fundamental mode crystals in this frequency range and does not constitute a functional incompatibility.

Compliance Status: Both parts are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8541.60.0050) classifications, ensuring regulatory equivalence for procurement and export purposes.

Frequently Asked Questions (FAQ)

Q: Can the HC49US-FF5F18-11.0592MHZ directly replace the 9B11000003 in existing PCB assemblies?

A: Yes. Both parts are HC-49/US through-hole packages with identical footprints and pin configurations. Direct PCB substitution is mechanically and electrically compatible.

Q: What is the significance of the 20 Ohm ESR difference between the two parts?

A: ESR affects crystal oscillator startup time and power consumption. The 60 Ohm ESR of the substitute part is within standard design margins for 11.0592 MHz fundamental mode crystals. Circuit validation is not required for this variation.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant. The original part is REACH Affected; the substitute is REACH Unaffected. Both carry identical ECCN and HTSUS classifications for regulatory purposes.

Q: Why is the original 9B11000003 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The substitute part from ILSI maintains identical specifications and is currently in active production.

Q: What is the MSL (Moisture Sensitivity Level) difference, and does it matter?

A: The original part lists MSL as Not Applicable; the substitute lists MSL 1 (Unlimited). MSL 1 represents the lowest moisture sensitivity classification and does not impose storage or handling restrictions beyond standard component care.

Q: Are physical dimensions identical between the two parts?

A: Minor dimensional variations exist within HC-49/US standard tolerances. Original: 11.50mm L x 5.00mm W x 3.68mm H (max). Substitute: 11.10mm L x 4.70mm W x 3.50mm H (max). Both fit standard HC-49/US footprints without modification.

Q: Can I use the substitute part in high-reliability or military applications?

A: Substitution decisions for high-reliability applications must be based on specific qualification requirements and design validation protocols beyond the scope of this equivalency reference.

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