HC-49/U-S25000000ABKB Equivalent & Substitute Parts

Part Overview

The HC-49/U-S25000000ABKB is a 25 MHz through-hole crystal oscillator manufactured by Citizen Finedevice Co Ltd. This fundamental mode crystal is designed for applications requiring precise frequency generation with a load capacitance of 20pF and 50 Ohms equivalent series resistance. The part maintains active product status with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when frequency, tolerance, package type, and mounting specifications remain consistent while secondary parameters such as load capacitance may vary within acceptable application ranges.

Substiute Parts

HC-49/U-S25000000ABKB

Citizen Finedevice Co LtdIn Stock: 818HC-49/U-S25000000ABKB Datasheet

Current PartRFQ

HC-49/U-S25000000ABJB

Citizen Finedevice Co LtdIn Stock: 16256HC-49/U-S25000000ABJB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HC-49/U-S25000000ABKB is permissible with the HC-49/U-S25000000ABJB based on the following criteria:

Critical Parameters (Must Match):

• Frequency: 25 MHz
• Frequency Tolerance: ±30ppm
• Frequency Stability: ±50ppm
• Operating Mode: Fundamental
• Mounting Type: Through Hole
• Package / Case: HC-49/US
• Physical Dimensions: 0.453" L x 0.183" W (11.50mm x 4.66mm)
• Height - Seated (Max): 0.138" (4.60mm)
• Operating Temperature Range: -10°C ~ 60°C
• ESR: 50 Ohms
• Manufacturer: Citizen Finedevice Co Ltd

Variable Parameter (Acceptable Variance):

• Load Capacitance: 20pF (main part) vs. 18pF (substitute)

The load capacitance difference of 2pF represents a secondary parameter variance. Both parts maintain identical frequency tolerance, stability, and electrical characteristics. The substitute part is qualified for applications where the circuit design accommodates the 18pF load capacitance specification.

Parameter Comparison

Engineering Selection Recommendations

Both the HC-49/U-S25000000ABKB and HC-49/U-S25000000ABJB maintain active product status from Citizen Finedevice Co Ltd. Both parts are ROHS3 compliant and carry unlimited moisture sensitivity rating (MSL 1), indicating equivalent environmental handling and regulatory compliance.

Selection between these parts is determined by circuit load capacitance requirements. The main part (HC-49/U-S25000000ABKB) is specified for 20pF load capacitance, while the substitute (HC-49/U-S25000000ABJB) operates at 18pF load capacitance. Circuit design specifications must confirm compatibility with the respective load capacitance value before part selection.

Frequently Asked Questions (FAQ)

Q: Can HC-49/U-S25000000ABJB replace HC-49/U-S25000000ABKB in all applications?

A: Substitution is valid only when the circuit design accommodates 18pF load capacitance. The 2pF difference from the main part's 20pF specification must be evaluated against circuit oscillator design parameters.

Q: Are the physical dimensions identical between these parts?

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). Through-hole mounting compatibility is equivalent.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, carry MSL 1 (unlimited) moisture sensitivity rating, and maintain active product status from the same manufacturer.

Q: What is the frequency tolerance specification for both parts?

A: Both parts maintain ±30ppm frequency tolerance with ±50ppm frequency stability across the -10°C ~ 60°C operating temperature range.

Q: Is there an inventory difference between these parts?

A: The main part (HC-49/U-S25000000ABKB) has 775 pcs in stock, while the substitute (HC-49/U-S25000000ABJB) has 16,166 pcs available. Availability should be confirmed at time of procurement.