Equivalent & Substitute Parts for 9B-7.3728MAAJ-B

Part Overview

The 9B-7.3728MAAJ-B is a 7.3728 MHz through-hole crystal oscillator manufactured by TXC CORPORATION, designed for fundamental mode operation with 18pF load capacitance and 80 Ohms equivalent series resistance. This component operates across the temperature range of -20°C to 70°C with frequency stability of ±30ppm.

The 9B-7.3728MAAJ-B is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this frequency specification.

Substiute Parts

9B-7.3728MAAJ-B

TXC CORPORATIONIn Stock: 9709B-7.3728MAAJ-B Datasheet

Current PartRFQ

HC49US-FF3F18-7.3728MHZ

ILSIIn Stock: 1321HC49US-FF3F18-7.3728MHZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 9B-7.3728MAAJ-B are identified based on strict electrical and mechanical parameter matching. The substitution logic requires that all critical parameters remain identical:

Mandatory Matching Parameters:

• Frequency: 7.3728 MHz (exact match required)
• Frequency Stability: ±30ppm (exact match required)
• Load Capacitance: 18pF (exact match required)
• ESR: 80 Ohms (exact match required)
• Operating Mode: Fundamental (exact match required)
• Package / Case: HC-49/US (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -20°C to 70°C (minimum requirement)

Compliance Parameters:

• RoHS3 Compliance status must be maintained

Parts meeting all mandatory parameters are classified as direct electrical and mechanical equivalents. Dimensional variations within the HC-49/US package specification are acceptable provided they do not exceed standard package tolerances.

Parameter Comparison

Engineering Selection Recommendations

The HC49US-FF3F18-7.3728MHZ manufactured by ILSI is a direct electrical and mechanical equivalent to the obsolete 9B-7.3728MAAJ-B. Selection of this substitute part is based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match exactly, including frequency, frequency stability, load capacitance, ESR, and operating mode. Circuit performance will be identical to the original specification.

Mechanical Compatibility: Both parts utilize the HC-49/US package with through-hole mounting. Dimensional variations fall within standard package tolerances and do not affect PCB assembly or mechanical fit.

Regulatory Compliance: The ILSI substitute maintains ROHS3 compliance and carries identical ECCN and HTSUS classifications, ensuring regulatory and trade compliance equivalence.

Product Status Advantage: The ILSI part is classified as active with confirmed inventory availability (1221 pieces), providing supply chain continuity for the obsolete TXC component.

Packaging Consideration: The ILSI substitute is supplied in bulk packaging, whereas original packaging information for the TXC part is not specified. Bulk packaging is standard for through-hole crystals and does not affect electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can the HC49US-FF3F18-7.3728MHZ be used as a direct replacement for the 9B-7.3728MAAJ-B without circuit modification?

A: Yes. All electrical parameters match exactly: frequency, frequency stability, load capacitance, ESR, and operating mode are identical. The HC-49/US package and through-hole mounting are mechanically compatible. No circuit modification is required.

Q: What is the significance of the dimensional differences between the two parts?

A: The TXC part measures 0.453" L x 0.197" W (11.50mm x 5.00mm) with 0.145" (3.68mm) seated height, while the ILSI part measures 0.437" L x 0.185" W (11.10mm x 4.70mm) with 0.138" (3.50mm) seated height. Both dimensions fall within the HC-49/US package specification tolerance. These variations do not affect electrical performance or PCB assembly compatibility.

Q: Why is the original 9B-7.3728MAAJ-B classified as obsolete?

A: Product status reflects manufacturer discontinuation. The TXC part is no longer in active production. The ILSI equivalent remains in active production with available inventory.

Q: Are there any compliance differences between the two parts?

A: No. Both parts are ROHS3 compliant, carry EAR99 ECCN classification, and share the same HTSUS code (8541.60.0050). Regulatory and trade compliance are equivalent.

Q: What is the difference between bulk and standard packaging for through-hole crystals?

A: Bulk packaging refers to quantity packaging for distribution and assembly operations. It does not affect the electrical or mechanical properties of the crystal component. The crystal itself is identical regardless of packaging format.

Q: Can frequency stability of ±30ppm be verified after component installation?

A: Frequency stability is a manufacturing specification verified during production testing. Post-installation verification requires specialized frequency measurement equipment and is outside the scope of component selection criteria.