HC-49/U-S48000000ABJB Equivalent & Substitute Parts

Part Overview

The HC-49/U-S48000000ABJB is a 48 MHz through-hole crystal oscillator manufactured by Citizen Finedevice Co Ltd. This component operates in 3rd overtone mode with 18pF load capacitance and 100 Ohms equivalent series resistance (ESR). The part is currently active in production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit alternative manufacturers meeting equivalent electrical and mechanical specifications.

Substiute Parts

HC-49/U-S48000000ABJB

Citizen Finedevice Co LtdIn Stock: 1134HC-49/U-S48000000ABJB Datasheet

Current PartRFQ

9B-48.000MAAJ-B

TXC CORPORATIONIn Stock: 10829B-48.000MAAJ-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HC-49/U-S48000000ABJB is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 48.0000 MHz (exact match required)
• Frequency Tolerance: ±30 ppm (maximum allowable deviation)
• Load Capacitance: 18 pF (exact match required)
• Operating Mode: 3rd Overtone (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): ±20 Ohms tolerance acceptable
• Operating Temperature Range: May extend beyond -10°C ~ 60°C
• Frequency Stability: May be tighter than ±50 ppm

The substitute part 9B-48.000MAAJ-B from TXC CORPORATION meets all mandatory matching criteria and falls within allowable variation limits for ESR (80 Ohms vs. 100 Ohms specified).

Parameter Comparison

Engineering Selection Recommendations

The HC-49/U-S48000000ABJB remains the preferred selection as the primary component due to its active production status. Both parts maintain ROHS3 compliance and are suitable for applications requiring 48 MHz crystal oscillation with 18pF load capacitance in HC-49/US packaging.

The 9B-48.000MAAJ-B substitute from TXC CORPORATION is electrically and mechanically compatible for direct replacement. The lower ESR value (80 Ohms vs. 100 Ohms) and extended operating temperature range (-20°C ~ 70°C vs. -10°C ~ 60°C) present no functional disadvantage. However, the obsolete product status of the TXC part indicates limited future availability and should be considered a secondary option for supply continuity purposes only.

For new designs, the HC-49/U-S48000000ABJB is recommended. For existing designs requiring substitution due to supply constraints, the 9B-48.000MAAJ-B provides equivalent performance within the specified electrical and mechanical parameters.

Frequently Asked Questions (FAQ)

Q: Can the 9B-48.000MAAJ-B directly replace the HC-49/U-S48000000ABJB in existing PCB designs?

A: Yes. Both parts use identical HC-49/US packaging and through-hole mounting. The minor dimensional variations (0.197" vs. 0.183" width, 0.145" vs. 0.138" height) remain within standard PCB footprint tolerances for this package type.

Q: What is the significance of the lower ESR in the TXC substitute?

A: The 9B-48.000MAAJ-B has 80 Ohms ESR compared to 100 Ohms in the Citizen part. Lower ESR reduces power dissipation and improves frequency stability margins. This represents an improvement rather than a compromise for circuit performance.

Q: Why is the TXC part listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production. While existing inventory may be available, future procurement cannot be guaranteed. The Citizen part's active status ensures long-term supply availability.

Q: Are there compliance differences between the two parts?

A: Both parts are ROHS3 compliant. The Citizen part has MSL 1 (unlimited moisture sensitivity), while the TXC part lists MSL as Not Applicable. Both are suitable for standard PCB assembly processes without special moisture handling requirements.

Q: Does the extended temperature range of the TXC part affect substitution suitability?

A: No. The TXC part's -20°C ~ 70°C range exceeds the Citizen part's -10°C ~ 60°C specification. If your application operates within the Citizen range, the TXC part remains fully compatible. Extended range capability does not create incompatibility.