Equivalent & Substitute Parts for 9B-8.000MAHK-B

Part Overview

The 9B-8.000MAHK-B is an 8 MHz through-hole crystal oscillator manufactured by TXC CORPORATION, designed for fundamental mode operation with a load capacitance of 20pF and 80 Ohms equivalent series resistance. This component operates across the industrial temperature range of -40°C to 85°C with frequency stability of ±30ppm.

The 9B-8.000MAHK-B is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this crystal frequency and package specification.

Substiute Parts

9B-8.000MAHK-B

TXC CORPORATIONIn Stock: 11039B-8.000MAHK-B Datasheet

Current PartRFQ

HC49US-FF5F18-8.000MHZ

ILSIIn Stock: 1523HC49US-FF5F18-8.000MHZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 9B-8.000MAHK-B are identified based on strict alignment with the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 8 MHz (exact match required)
• Package / Case: HC-49/US (physical compatibility)
• Mounting Type: Through Hole (assembly compatibility)
• Operating Mode: Fundamental (circuit operation)
• Operating Temperature Range: -40°C to 85°C (environmental specification)
• Frequency Stability: ±30ppm (timing accuracy)
• ESR: 80 Ohms (electrical performance)

Allowable Variation:

• Load Capacitance: 20pF (main part) to 18pF (substitute) — minor variation within typical circuit tolerance margins for crystal load capacitance design

The substitute part HC49US-FF5F18-8.000MHZ meets all mandatory parameters while operating with an 18pF load capacitance specification. This 2pF reduction from the original 20pF specification remains within acceptable design margins for most applications, as crystal load capacitance tolerance is typically ±10% in standard circuit implementations.

Parameter Comparison

Engineering Selection Recommendations

HC49US-FF5F18-8.000MHZ as Substitute for 9B-8.000MAHK-B:

The HC49US-FF5F18-8.000MHZ is a direct functional equivalent for applications requiring an 8 MHz through-hole crystal with HC-49/US packaging. This substitute part satisfies all mandatory electrical and mechanical parameters specified for the obsolete 9B-8.000MAHK-B.

Compliance and Certification Alignment:

• Both parts maintain ROHS3 compliance, supporting regulatory requirements for restricted substance management
• Both parts are classified under identical HTSUS code 8541.60.0050
• Both parts operate under EAR99 export classification

Product Status Advantage: The HC49US-FF5F18-8.000MHZ carries Active product status, ensuring ongoing availability and supply chain support. The 9B-8.000MAHK-B is classified as Obsolete, making the substitute part the appropriate selection for new designs and ongoing production support.

Load Capacitance Consideration: The 2pF reduction in load capacitance (from 20pF to 18pF) represents a minor specification variation. This difference falls within standard design tolerance margins for crystal oscillator circuits. Circuit designers should verify that the application's oscillator tank circuit can accommodate the 18pF load capacitance specification without requiring component value adjustments.

Frequently Asked Questions (FAQ)

Q: Can the HC49US-FF5F18-8.000MHZ directly replace the 9B-8.000MAHK-B without circuit modifications?

A: The HC49US-FF5F18-8.000MHZ is electrically and mechanically compatible with the 9B-8.000MAHK-B for most applications. The 2pF load capacitance difference (20pF to 18pF) typically does not require circuit modifications, as crystal load capacitance tolerance in standard oscillator designs accommodates ±10% variation. However, applications with tightly controlled frequency stability requirements should verify oscillator performance after substitution.

Q: Are the physical dimensions of the HC49US-FF5F18-8.000MHZ compatible with PCB layouts designed for the 9B-8.000MAHK-B?

A: Both parts use the HC-49/US package form factor. The HC49US-FF5F18-8.000MHZ exhibits minor dimensional variations (approximately 0.016" shorter in length and 0.012" shorter in width) compared to the 9B-8.000MAHK-B. These variations remain within HC-49/US package tolerance specifications and do not affect PCB footprint compatibility or through-hole mounting.

Q: What is the significance of the different manufacturers (TXC CORPORATION vs. ILSI)?

A: Both manufacturers produce crystals to the same HC-49/US industry standard with identical electrical specifications for this 8 MHz application. The substitute part from ILSI meets all functional requirements and compliance certifications of the original TXC CORPORATION part. Manufacturer differences do not affect electrical performance or compatibility in this application.

Q: Why is the substitute part listed as Active status while the original is Obsolete?

A: The 9B-8.000MAHK-B has reached end-of-life status with TXC CORPORATION. The HC49US-FF5F18-8.000MHZ maintains Active product status with ILSI, ensuring continued availability for production requirements and new design implementations. Selecting the Active substitute part eliminates supply chain risk associated with obsolete components.

Q: Does the load capacitance difference affect frequency stability?

A: Both parts specify identical frequency stability of ±30ppm. Load capacitance affects the oscillation frequency within the crystal's specified tolerance band but does not alter the stability specification itself. The 18pF load capacitance of the substitute part operates within the same ±30ppm stability specification as the original 20pF part.

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts maintain ROHS3 compliance and carry identical HTSUS classification. The substitute part is REACH Unaffected, while the original part is REACH Affected. For applications subject to REACH regulations, the HC49US-FF5F18-8.000MHZ may offer simplified compliance documentation requirements.