HC-49/U-S25000000AMJB Equivalent & Substitute Parts

Part Overview

The HC-49/U-S25000000AMJB is a 25 MHz through-hole crystal oscillator manufactured by Citizen Finedevice Co Ltd. This component is classified as an active product with ROHS3 compliance and unlimited moisture sensitivity rating. The part operates across a temperature range of -40°C to 85°C with a frequency tolerance of ±30ppm and load capacitance of 18pF. Finding equivalent substitute parts is necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit operation within alternative temperature or stability specifications.

Substiute Parts

HC-49/U-S25000000AMJB

Citizen Finedevice Co LtdIn Stock: 973HC-49/U-S25000000AMJB 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 eligibility for the HC-49/U-S25000000AMJB is determined by the following critical parameters:

• Frequency: Must be 25 MHz
• Frequency Tolerance: Must be ±30ppm or tighter
• Load Capacitance: Must be 18pF
• ESR: Must be 50 Ohms
• Package / Case: Must be HC-49/US
• Mounting Type: Must be Through Hole
• Operating Mode: Must be Fundamental

The substitute part HC-49/U-S25000000ABJB meets all core electrical and mechanical requirements. Differences in frequency stability (±50ppm vs ±60ppm) and operating temperature range (-10°C ~ 60°C vs -40°C ~ 85°C) represent the primary distinctions. These differences do not affect substitution eligibility when the application operates within the substitute part's specified temperature range.

Parameter Comparison

Engineering Selection Recommendations

Both parts are active products with ROHS3 compliance and REACH unaffected status. Selection between HC-49/U-S25000000AMJB and HC-49/U-S25000000ABJB depends on application temperature requirements. The primary part supports extended temperature operation from -40°C to 85°C, while the substitute part operates within -10°C to 60°C. Applications requiring full temperature range coverage must use the primary part. Applications operating within the -10°C to 60°C window may use either part. The substitute part offers improved frequency stability at ±50ppm compared to the primary part's ±60ppm specification.

Frequently Asked Questions (FAQ)

Q: Can HC-49/U-S25000000ABJB replace HC-49/U-S25000000AMJB in all applications?

A: Substitution is valid only when the application operates within the temperature range of -10°C to 60°C. Applications requiring operation below -10°C or above 60°C must use the primary part HC-49/U-S25000000AMJB.

Q: What are the critical parameters that must match for substitution?

A: Frequency (25 MHz), frequency tolerance (±30ppm), load capacitance (18pF), ESR (50 Ohms), package type (HC-49/US), and mounting type (through hole) must remain identical. Operating temperature range and frequency stability may differ within acceptable application limits.

Q: Are both parts mechanically compatible?

A: Yes. Both parts use the HC-49/US package with identical dimensions (0.453" L x 0.183" W / 11.50mm x 4.66mm) and maximum seated height (0.138" / 4.60mm). Through-hole mounting compatibility is identical.

Q: What is the difference in frequency stability between these parts?

A: The primary part HC-49/U-S25000000AMJB specifies ±60ppm frequency stability, while the substitute HC-49/U-S25000000ABJB specifies ±50ppm. The substitute part offers tighter stability performance.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL rating of 1 (unlimited). ECCN and HTSUS classifications are identical.