9B-14.7456MAAJ-B Crystal Equivalent & Substitute Parts

Part Overview

The 9B-14.7456MAAJ-B is a 14.7456 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, 30 Ohms equivalent series resistance (ESR), and operates across the -20°C to 70°C temperature range with ±30ppm frequency stability.

The 9B-14.7456MAAJ-B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems utilizing this crystal frequency and package specification.

Substiute Parts

9B-14.7456MAAJ-B

TXC CORPORATIONIn Stock: 15849B-14.7456MAAJ-B Datasheet

Current PartRFQ

HC49US-FF3F18-14.7456MHZ

ILSIIn Stock: 2176HC49US-FF3F18-14.7456MHZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 9B-14.7456MAAJ-B is determined by strict alignment with the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 14.7456 MHz (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 Mode: Fundamental (exact match required)
• Frequency Stability: ±30ppm (exact match required)
• Operating Temperature Range: -20°C ~ 70°C (minimum requirement)

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): Variation permitted within circuit design tolerances
• Physical dimensions: Minor variations acceptable within HC-49/US package specification envelope
• Manufacturer: Different manufacturers acceptable if all critical parameters align

The substitute part HC49US-FF3F18-14.7456MHZ manufactured by ILSI meets all mandatory matching criteria and is therefore classified as an equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

HC49US-FF3F18-14.7456MHZ (ILSI) as Primary Substitute:

The HC49US-FF3F18-14.7456MHZ qualifies as a direct equivalent substitute for the obsolete 9B-14.7456MAAJ-B based on the following engineering criteria:

1. Frequency and Stability Alignment: Both parts operate at 14.7456 MHz with identical ±30ppm frequency stability and tolerance specifications, ensuring equivalent timing performance in target applications.

2. Load Capacitance Compatibility: The 18pF load capacitance specification is identical, confirming compatibility with existing oscillator circuit designs without modification.

3. Package and Mounting Compatibility: Both components utilize the HC-49/US through-hole package with compatible physical dimensions within the standard package envelope, enabling direct PCB mounting without layout changes.

4. Operating Temperature Range: Identical -20°C to 70°C operating range ensures equivalent environmental performance across specified application conditions.

5. Compliance Status: The ILSI substitute maintains ROHS3 compliance, matching the regulatory status of the original part. The substitute is classified as Active product status, providing improved supply chain availability compared to the obsolete TXC original.

6. ESR Consideration: The ILSI substitute exhibits 40 Ohms ESR compared to the original 30 Ohms. This 10 Ohm increase remains within acceptable tolerance for HC-49/US crystal applications and does not compromise oscillator startup or frequency stability performance in standard circuit implementations.

Frequently Asked Questions (FAQ)

Q: Can the HC49US-FF3F18-14.7456MHZ be used as a direct replacement without circuit modification?

A: Yes. The substitute part matches all critical electrical parameters (frequency, load capacitance, frequency stability, operating temperature range) and package specifications (HC-49/US through-hole). Direct substitution is supported without circuit redesign.

Q: What is the significance of the 10 Ohm ESR difference between the original and substitute?

A: The original 9B-14.7456MAAJ-B specifies 30 Ohms ESR, while the HC49US-FF3F18-14.7456MHZ specifies 40 Ohms ESR. This variation is within normal manufacturing tolerance for HC-49/US crystals and does not affect oscillator performance in standard circuit implementations. ESR primarily influences startup time and power consumption; the 10 Ohm increase produces negligible impact on these parameters.

Q: Are there physical dimension differences between these parts?

A: Minor dimensional variations exist. The TXC original measures 0.453" L x 0.197" W (11.50mm x 5.00mm) with 0.145" (3.68mm) maximum seated height. The ILSI substitute measures 0.437" L x 0.185" W (11.10mm x 4.70mm) with 0.138" (3.50mm) maximum seated height. Both dimensions remain within the HC-49/US package specification envelope and are compatible with standard through-hole PCB designs.

Q: Why is the original part classified as obsolete?

A: The 9B-14.7456MAAJ-B is designated obsolete by TXC CORPORATION, indicating discontinued manufacturing and limited availability. The HC49US-FF3F18-14.7456MHZ maintains active product status with current manufacturing support, ensuring reliable supply chain access for ongoing applications.

Q: What compliance certifications apply to both parts?

A: Both the original 9B-14.7456MAAJ-B and substitute HC49US-FF3F18-14.7456MHZ are ROHS3 compliant. The original is REACH Affected; the substitute is REACH Unaffected. Both carry EAR99 ECCN classification and 8541.60.0050 HTSUS code.

Q: Can frequency or load capacitance be different in a substitute part?

A: No. Frequency and load capacitance are critical parameters that must match exactly. The 14.7456 MHz frequency and 18pF load capacitance are determined by circuit design requirements and cannot be altered without complete oscillator circuit redesign.