HC-49/U-S8000000ABIT Equivalent & Substitute Parts

Part Overview

The HC-49/U-S8000000ABIT is an 8 MHz through-hole crystal oscillator manufactured by Citizen Finedevice Co Ltd. This active product operates in fundamental mode with a load capacitance of 16pF and an equivalent series resistance (ESR) of 100 Ohms. The component is housed in an HC-49/US package and is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Finding equivalent or substitute parts may be necessary due to inventory constraints, supply chain considerations, or specific application requirements where load capacitance tolerance permits variation.

Substiute Parts

HC-49/U-S8000000ABIT

Citizen Finedevice Co LtdIn Stock: 794HC-49/U-S8000000ABIT Datasheet

Current PartRFQ

HC-49/U-S8000000ABJB

Citizen Finedevice Co LtdIn Stock: 8154HC-49/U-S8000000ABJB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HC-49/U-S8000000ABIT is determined by the following critical parameters:

• Frequency: Must be 8 MHz (exact match required)
• Frequency Tolerance: Must be ±30ppm or tighter
• Operating Mode: Must be Fundamental
• Package / Case: Must be HC-49/US (physical and electrical compatibility)
• Mounting Type: Must be Through Hole
• Operating Temperature Range: Must cover or exceed -10°C ~ 60°C
• ESR: Must be 100 Ohms (electrical performance requirement)

The load capacitance parameter (16pF) defines the primary distinction between the main part and its substitute. Variations in load capacitance within the same frequency and tolerance specifications are permissible when circuit design accommodates the difference or when the application does not impose strict load capacitance requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the HC-49/U-S8000000ABIT and HC-49/U-S8000000ABJB are active products from the same manufacturer with identical compliance certifications (ROHS3 compliant, REACH unaffected, EAR99 classification). The parts share identical frequency, tolerance, ESR, operating mode, temperature range, and physical package specifications. The sole electrical difference is the load capacitance specification: 16pF versus 18pF.

Selection between these parts depends on circuit design requirements. If the application circuit is designed for 16pF load capacitance, the main part HC-49/U-S8000000ABIT is the specified choice. If the application circuit accommodates 18pF load capacitance or if load capacitance variation is not a critical design constraint, the substitute part HC-49/U-S8000000ABJB is electrically and mechanically compatible.

Both parts maintain identical regulatory compliance and are suitable for applications requiring ROHS3 compliance and unlimited moisture sensitivity tolerance.

Frequently Asked Questions (FAQ)

Q: Can HC-49/U-S8000000ABJB be used as a direct replacement for HC-49/U-S8000000ABIT?

A: Yes, provided the application circuit design permits 18pF load capacitance. Both parts are identical in frequency, tolerance, ESR, operating mode, temperature range, and physical package. The load capacitance difference must be evaluated against circuit specifications.

Q: What is the significance of load capacitance in crystal selection?

A: Load capacitance is the capacitive load the crystal oscillator circuit presents to the crystal element. It affects the crystal's operating frequency and stability. Crystals are specified for a particular load capacitance value. Using a crystal with a different load capacitance than the circuit is designed for may result in frequency deviation.

Q: Are both parts physically interchangeable?

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). Both are through-hole mounted components.

Q: What compliance certifications apply to both parts?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Both carry HTSUS code 8541.60.0050.

Q: Is there an inventory advantage to selecting the substitute part?

A: The substitute part HC-49/U-S8000000ABJB has higher inventory availability (8100 Pcs) compared to the main part HC-49/U-S8000000ABIT (727 Pcs). This may be a consideration for high-volume applications or extended lead time mitigation.