9B-14.31818MAAJ-B Crystal Equivalent & Substitute Parts

Part Overview

The 9B-14.31818MAAJ-B is a 14.31818 MHz through-hole crystal oscillator manufactured by TXC CORPORATION, designed for fundamental mode operation in applications requiring precise frequency control. This component features an 18pF load capacitance and 30 Ohms equivalent series resistance (ESR), housed in the HC-49/US package format.

The 9B-14.31818MAAJ-B is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for legacy systems utilizing this frequency specification.

Substiute Parts

9B-14.31818MAAJ-B

TXC CORPORATIONIn Stock: 15629B-14.31818MAAJ-B Datasheet

Current PartRFQ

HC49US-FF3F18-14.31818MHZ

ILSIIn Stock: 1824HC49US-FF3F18-14.31818MHZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 9B-14.31818MAAJ-B is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 14.31818 MHz (exact match required)
• Frequency Stability: ±30ppm (exact match required)
• Load Capacitance: 18pF (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 required)

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): Tolerance of ±10 Ohms from 30 Ohms specification is acceptable within circuit design margins
• Physical dimensions: Minor variations within HC-49/US standard envelope are permissible
• Product Status: Active status preferred for supply continuity; obsolete status acceptable only if all electrical parameters match

The HC49US-FF3F18-14.31818MHZ manufactured by ILSI qualifies as a direct substitute based on matching all mandatory parameters while maintaining compatibility with existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: HC49US-FF3F18-14.31818MHZ (ILSI)

The HC49US-FF3F18-14.31818MHZ is the qualified substitute for the obsolete 9B-14.31818MAAJ-B. Selection rationale is based on the following engineering criteria:

Electrical Compatibility: All critical electrical parameters match the original specification. The ESR variance of 10 Ohms (40 Ohms versus 30 Ohms) remains within acceptable circuit design margins for HC-49/US crystal applications and does not compromise frequency stability or circuit performance.

Regulatory Compliance: Both components maintain ROHS3 compliance, ensuring compatibility with current manufacturing and environmental standards. The ILSI substitute is REACH Unaffected, providing additional supply chain assurance compared to the REACH Affected status of the original TXC component.

Product Status: The ILSI part maintains active production status, ensuring long-term availability and supply reliability for ongoing applications or production requirements.

Package and Mounting Compatibility: Identical HC-49/US package specification and through-hole mounting type ensure direct mechanical and electrical interchangeability without circuit board redesign or layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the HC49US-FF3F18-14.31818MHZ be used as a direct replacement for the 9B-14.31818MAAJ-B without circuit modifications?

A: Yes. The HC49US-FF3F18-14.31818MHZ is electrically and mechanically compatible with the 9B-14.31818MAAJ-B. Both components share identical frequency, load capacitance, operating temperature range, and HC-49/US package specification. The 10 Ohm ESR difference (40 Ohms versus 30 Ohms) is within acceptable tolerance for this crystal package class and does not require circuit redesign.

Q: What is the significance of the ESR difference between the two parts?

A: ESR (Equivalent Series Resistance) affects crystal startup time and circuit damping characteristics. The 10 Ohm increase (from 30 Ohms to 40 Ohms) in the ILSI substitute represents a 33% relative increase but remains within the operational envelope of standard HC-49/US crystal circuits. This variance does not compromise frequency stability or long-term reliability in applications designed for ±30ppm tolerance.

Q: Why is the original 9B-14.31818MAAJ-B classified as obsolete?

A: Obsolete status indicates that TXC CORPORATION has discontinued production of this specific part number. The HC49US-FF3F18-14.31818MHZ substitute maintains active production status, providing continuity for applications requiring the 14.31818 MHz frequency specification.

Q: Are there any compliance differences between the original and substitute parts?

A: Both components are ROHS3 compliant. The ILSI substitute carries REACH Unaffected status, whereas the original TXC part is REACH Affected. This difference favors the substitute for applications subject to REACH regulatory requirements.

Q: What is the physical size difference between these two crystals?

A: Both components conform to the HC-49/US package standard. The TXC part measures 0.453" L × 0.197" W (11.50mm × 5.00mm) with a maximum seated height of 0.145" (3.68mm). The ILSI substitute measures 0.437" L × 0.185" W (11.10mm × 4.70mm) with a maximum seated height of 0.138" (3.50mm). These minor dimensional variations remain within HC-49/US tolerance specifications and do not affect circuit board compatibility or mounting.

Q: Is the frequency tolerance specification identical between both parts?

A: Yes. Both the 9B-14.31818MAAJ-B and HC49US-FF3F18-14.31818MHZ specify ±30ppm frequency tolerance and ±30ppm frequency stability, ensuring equivalent performance in frequency-critical applications.