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

Part Overview

The 9B-12.288MAAJ-B is a 12.288 MHz through-hole crystal oscillator manufactured by TXC CORPORATION. This component operates at a fundamental frequency with 18pF load capacitance and 40 Ohms equivalent series resistance in an HC-49/US package. The part is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement planning. Substitute parts must maintain electrical and mechanical compatibility while meeting application frequency and stability requirements.

Substiute Parts

9B-12.288MAAJ-B

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

Current PartRFQ

9B-12.288MEEJ-B

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

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 9B-12.288MAAJ-B is determined by 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)
• Package / Case: HC-49/US (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Mode: Fundamental (exact match required)

Allowable Variation Parameters:

• Frequency Stability: The main part specifies ±30ppm. Substitute parts with equal or tighter (lower) frequency stability values are acceptable.
• Operating Temperature Range: Substitute parts must support the full -20°C ~ 70°C range or a range that encompasses it.

The 9B-12.288MEEJ-B qualifies as a direct substitute because it maintains all mandatory parameters while offering improved frequency stability (±10ppm versus ±30ppm).

Parameter Comparison

Engineering Selection Recommendations

The 9B-12.288MEEJ-B is a direct functional substitute for the 9B-12.288MAAJ-B. Both components are obsolete products from TXC CORPORATION with identical mechanical and electrical specifications except for frequency stability.

Selection Basis:

The substitute part offers tighter frequency stability (±10ppm versus ±30ppm) while maintaining all other electrical and mechanical parameters. This represents an upgrade path for applications where the original ±30ppm tolerance is acceptable. Both parts are ROHS3 compliant and REACH affected, meeting current regulatory requirements.

For applications requiring the original ±30ppm specification, the 9B-12.288MAAJ-B remains the specified component. For applications where improved stability is beneficial or required, the 9B-12.288MEEJ-B provides enhanced performance within the same form factor and pinout.

Frequently Asked Questions (FAQ)

Q: Can the 9B-12.288MEEJ-B be used as a direct replacement for the 9B-12.288MAAJ-B?

A: Yes. The 9B-12.288MEEJ-B is a direct substitute. It maintains identical frequency, load capacitance, ESR, package type, mounting configuration, and physical dimensions. The substitute offers improved frequency stability (±10ppm versus ±30ppm).

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

A: Frequency (12.288 MHz), load capacitance (18pF), ESR (40 Ohms), package type (HC-49/US), mounting type (through hole), and operating mode (fundamental) must be identical. Frequency stability may be equal or tighter in the substitute.

Q: Are there any PCB layout or circuit design changes required when switching to the 9B-12.288MEEJ-B?

A: No. The substitute maintains identical physical dimensions (0.453" L x 0.197" W, 3.68mm max height), pinout, and electrical loading characteristics. No circuit modifications are necessary.

Q: Do both parts meet current compliance standards?

A: Yes. Both the 9B-12.288MAAJ-B and 9B-12.288MEEJ-B are ROHS3 compliant and REACH affected, meeting current regulatory requirements.

Q: Why are both parts listed as obsolete?

A: Both components are classified as obsolete by the manufacturer. Procurement should be based on current inventory availability from authorized distributors.