11.0592 MHz Crystal 30pF HC-49/US (9B11000121)

Part Overview

The TXC CORPORATION 9B11000121 is a through-hole mounted crystal oscillator operating at 11.0592 MHz with 30pF load capacitance and 40 Ohms equivalent series resistance (ESR). This component is housed in the HC-49/US package and is designed for fundamental mode operation across the temperature range of -10°C to 70°C.

The 9B11000121 is classified as Obsolete. Locating equivalent substitute parts is necessary to support ongoing production requirements, field repairs, and system maintenance where this frequency standard remains essential to circuit operation.

Substiute Parts

9B11000121

TXC CORPORATIONIn Stock: 7719B11000121 Datasheet

Current PartRFQ

ECS-110.5-32-4

ECS Inc.In Stock: 1154ECS-110.5-32-4 Datasheet

SimilarRFQ

ECS-110.5-32-4X

ECS Inc.In Stock: 2540ECS-110.5-32-4X Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 9B11000121 is determined by the following critical parameters that must remain constant or within acceptable tolerance:

Critical Parameters (Must Match):

• Frequency: 11.0592 MHz
• Frequency Tolerance: ±30ppm
• Operating Mode: Fundamental
• Package / Case: HC-49/US
• Mounting Type: Through Hole
• Operating Temperature Range: -10°C to 70°C

Allowable Variation Parameters:

• Load Capacitance: 30pF (main part) to 32pF (substitute parts) — variation within 2pF is acceptable for HC-49/US crystals in this frequency range
• ESR: 40 Ohms (main part) to 60 Ohms (substitute parts) — higher ESR remains within operational limits for this package class
• Frequency Stability: ±50ppm (both main and substitute parts match)

The substitute parts ECS-110.5-32-4 and ECS-110.5-32-4X from ECS Inc. meet all critical parameters. The load capacitance difference of 2pF and ESR increase to 60 Ohms represent acceptable engineering tolerances for through-hole crystal applications in this frequency band.

Parameter Comparison

Engineering Selection Recommendations

For New Designs and RoHS-Compliant Applications:

ECS-110.5-32-4X is the preferred substitute. This part is classified as Active product status, ensuring long-term availability and supply chain stability. It maintains ROHS3 compliance, matching the regulatory posture of the original 9B11000121. The 2pF load capacitance increase and 20 Ohm ESR increase are within acceptable engineering tolerances for HC-49/US crystal applications.

For Legacy System Maintenance and Field Repairs:

ECS-110.5-32-4 provides functional equivalence where RoHS compliance is not a design constraint. This part is classified as Not For New Designs, indicating limited future availability. Use this substitute only when ECS-110.5-32-4X is unavailable and RoHS compliance is not required.

Compliance Considerations:

The original 9B11000121 is ROHS3 compliant and REACH affected. ECS-110.5-32-4X maintains ROHS3 compliance and is REACH unaffected, providing superior regulatory alignment. ECS-110.5-32-4 is RoHS non-compliant and should not be used in applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can the load capacitance difference between 30pF and 32pF affect circuit operation?

A: The 2pF difference is within acceptable tolerance for HC-49/US crystals at 11.0592 MHz. Circuit design typically accommodates load capacitance variation through tuning capacitors in the oscillator circuit. Verify that your circuit design includes appropriate load capacitance compensation.

Q: Why is the ESR higher in the substitute parts (60 Ohms vs. 40 Ohms)?

A: ESR variation within this range is normal across different manufacturers and production batches for HC-49/US crystals. The 20 Ohm increase does not degrade performance in standard oscillator circuits. Confirm that your circuit design does not impose strict ESR requirements below 60 Ohms.

Q: What is the difference between ECS-110.5-32-4 and ECS-110.5-32-4X?

A: Both parts are electrically identical with matching frequency, tolerance, stability, load capacitance, and ESR specifications. The primary differences are product status (Not For New Designs vs. Active) and RoHS compliance (non-compliant vs. ROHS3 compliant). ECS-110.5-32-4X is recommended for all new applications.

Q: Are the physical dimensions compatible with the original part?

A: Both substitute parts use the HC-49/US package. The main part measures 0.453" L x 0.197" W with 0.145" maximum seated height. Substitute parts measure 0.447" L x 0.183" W with 0.138" maximum seated height. These dimensional differences are within HC-49/US package tolerance and do not affect through-hole PCB mounting compatibility.

Q: Can I use these substitutes in production if my design is already qualified with the 9B11000121?

A: Substitution requires engineering evaluation of your specific circuit design. The electrical parameters are compatible, but design qualification with the substitute part is recommended to confirm performance in your application. Document any design changes resulting from the substitution.