Equivalent & Substitute Parts for 9B-12.288MEEJ-B

Part Overview

The 9B-12.288MEEJ-B is a 12.288 MHz through-hole crystal manufactured by TXC CORPORATION, designed for fundamental mode operation in applications requiring precise frequency control. This component operates across the temperature range of -20°C to 70°C with a load capacitance of 18pF and an equivalent series resistance of 40 Ohms. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and procurement planning.

Substiute Parts

9B-12.288MEEJ-B

TXC CORPORATIONIn Stock: 9589B-12.288MEEJ-B Datasheet

Current PartRFQ

9B-12.288MAAJ-B

TXC CORPORATIONIn Stock: 15299B-12.288MAAJ-B Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 9B-12.288MEEJ-B is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 12.288 MHz (exact match required)
• Load Capacitance: 18pF (exact match required)
• ESR: 40 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 (exact match required)

Allowable Variation Parameter:

• Frequency Stability: The main part specifies ±10ppm. Substitute parts with equal or tighter frequency stability specifications are acceptable. Parts with looser frequency stability (such as ±30ppm) represent a relaxation of performance and are classified as functional substitutes only where application requirements permit.

The 9B-12.288MAAJ-B meets all mandatory matching parameters but differs in frequency stability specification, making it a conditional substitute dependent on application tolerance requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Equivalent Performance): No direct equivalent with identical frequency stability is provided in the substitute list. The 9B-12.288MEEJ-B with ±10ppm stability represents the tighter tolerance specification.

For Functional Substitution (Relaxed Tolerance Applications): The 9B-12.288MAAJ-B is suitable as a substitute where application design permits frequency stability of ±30ppm. This part maintains identical mechanical, electrical, and compliance characteristics while accepting a three-fold relaxation in frequency stability tolerance. Both parts are ROHS3 compliant, REACH affected, and classified under ECCN EAR99 with HTSUS code 8541.60.0050.

Compliance Considerations: Both parts maintain equivalent regulatory status. Selection between these obsolete components should be based solely on the application's frequency stability requirement and the availability of inventory at the time of procurement.

Frequently Asked Questions (FAQ)

Q: Can the 9B-12.288MAAJ-B replace the 9B-12.288MEEJ-B in all applications?

A: The 9B-12.288MAAJ-B is mechanically and electrically compatible with identical package, mounting, load capacitance, and ESR specifications. However, it specifies ±30ppm frequency stability compared to the ±10ppm of the main part. Substitution is valid only for applications where the system design tolerates the looser frequency stability specification.

Q: What are the critical parameters that must match for substitution?

A: Frequency (12.288 MHz), load capacitance (18pF), ESR (40 Ohms), operating mode (Fundamental), package type (HC-49/US), mounting method (Through Hole), and operating temperature range (-20°C to 70°C) must all match exactly. Frequency stability is the only parameter where relaxation is permissible based on application requirements.

Q: Are both parts physically interchangeable?

A: Yes. Both parts share identical dimensions (0.453" L x 0.197" W, 11.50mm x 5.00mm) and maximum seated height (0.145" / 3.68mm). They use the same HC-49/US package and through-hole mounting configuration, ensuring direct mechanical interchangeability on PCBs designed for either part.

Q: What is the difference in frequency stability between these parts?

A: The 9B-12.288MEEJ-B specifies ±10ppm frequency stability, while the 9B-12.288MAAJ-B specifies ±30ppm. This represents a three-fold increase in allowable frequency deviation. Applications sensitive to frequency accuracy should use the tighter ±10ppm specification.

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

A: No. Both parts are ROHS3 compliant, REACH affected, and carry identical ECCN (EAR99) and HTSUS (8541.60.0050) classifications. Regulatory and environmental compliance status is equivalent.