HC-49/U-S20000000ABKB Equivalent & Substitute Parts

Part Overview

The HC-49/U-S20000000ABKB is a 20 MHz through-hole crystal oscillator manufactured by Citizen Finedevice Co Ltd. This fundamental mode crystal is designed for applications requiring precise frequency control with a load capacitance of 20pF and 50 Ohms equivalent series resistance. The part is actively produced and ROHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts may be required due to inventory constraints, supply chain considerations, or specific application load capacitance requirements.

Substiute Parts

HC-49/U-S20000000ABKB

Citizen Finedevice Co LtdIn Stock: 1164HC-49/U-S20000000ABKB Datasheet

Current PartRFQ

HC-49/U-S20000000ABJB

Citizen Finedevice Co LtdIn Stock: 12779HC-49/U-S20000000ABJB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The HC-49/U-S20000000ABJB qualifies as a substitute for the HC-49/U-S20000000ABKB based on the following critical parameters:

• Identical frequency: 20 MHz
• Identical frequency tolerance: ±30ppm
• Identical ESR: 50 Ohms
• Identical operating mode: Fundamental
• Identical operating temperature range: -10°C ~ 60°C
• Identical mounting type: Through Hole
• Identical package: HC-49/US
• Identical physical dimensions: 0.453" L x 0.183" W (11.50mm x 4.66mm)
• Identical product status: Active
• Identical RoHS compliance: ROHS3 Compliant

The primary difference is load capacitance: the substitute part specifies 18pF versus the main part's 20pF. This variation falls within acceptable substitution parameters for HC-49/US series crystals, as load capacitance tolerance is a standard design consideration in crystal oscillator circuit implementation.

Parameter Comparison

Engineering Selection Recommendations

Both parts are actively manufactured by Citizen Finedevice Co Ltd and maintain ROHS3 compliance. The HC-49/U-S20000000ABJB is a valid substitute where load capacitance of 18pF is compatible with circuit design specifications. Selection between these parts should be based on circuit load capacitance requirements and inventory availability. Both parts meet identical frequency, tolerance, temperature, and mechanical specifications.

Frequently Asked Questions (FAQ)

Q: Can HC-49/U-S20000000ABJB replace HC-49/U-S20000000ABKB in all applications?

A: The substitute part is compatible where circuit load capacitance specifications accommodate 18pF operation. Load capacitance is a design parameter that must be verified against your oscillator circuit requirements.

Q: Are the physical dimensions identical?

A: Yes. Both parts share identical HC-49/US package dimensions: 0.453" L x 0.183" W (11.50mm x 4.66mm) with maximum seated height of 0.138" (4.60mm).

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8541.60.0050.

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

A: Load capacitance (20pF vs 18pF) affects the crystal's operating frequency in the circuit. The difference must be accommodated through circuit design or load capacitance adjustment to maintain frequency accuracy within the ±30ppm tolerance specification.

Q: Are both parts actively produced?

A: Yes. Both parts maintain Active product status with Citizen Finedevice Co Ltd.