9B-28.63636MAAJ-B Crystal Equivalent & Substitute Parts

Part Overview

The 9B-28.63636MAAJ-B is a 28.63636 MHz through-hole crystal oscillator manufactured by TXC CORPORATION, designed for fundamental mode operation with 18pF load capacitance and 30 Ohms equivalent series resistance. This component operates across the -20°C to 70°C temperature range and is housed in the HC-49/US package format.

The 9B-28.63636MAAJ-B is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this frequency specification.

Substiute Parts

9B-28.63636MAAJ-B

TXC CORPORATIONIn Stock: 9669B-28.63636MAAJ-B Datasheet

Current PartRFQ

9B-28.63636MEEJ-B

FTSIn Stock: 12539B-28.63636MEEJ-B Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 9B-28.63636MAAJ-B crystal is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 28.63636 MHz (exact match required)
• Load Capacitance: 18pF (exact match required)
• ESR: 30 Ohms (exact match required)
• Operating Mode: Fundamental (exact match required)
• Operating Temperature Range: -20°C to 70°C (minimum coverage required)
• Mounting Type: Through Hole (exact match required)

Allowable Variation Parameters:

• Frequency Stability: May improve (lower ppm value acceptable)
• Package / Case: HC-49/US or HC-49S (both HC-49 series variants)
• Product Status: Active status preferred for obsolete components
• Compliance Certifications: RoHS and REACH status improvements acceptable

The substitute part 9B-28.63636MEEJ-B meets all mandatory matching criteria while providing improved frequency stability (±10ppm versus ±30ppm) and active product status.

Parameter Comparison

Engineering Selection Recommendations

The 9B-28.63636MEEJ-B is a direct functional substitute for the obsolete 9B-28.63636MAAJ-B based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match exactly: 28.63636 MHz frequency, 18pF load capacitance, 30 Ohms ESR, and fundamental operating mode. The substitute provides improved frequency stability at ±10ppm compared to the original ±30ppm specification.

Mechanical Compatibility: Both components utilize HC-49 series through-hole packages with identical physical dimensions (11.50 x 5.00 mm) and maximum seated height (3.68 mm), ensuring direct PCB footprint compatibility.

Compliance Status: The substitute part maintains RoHS compliance and provides active product status, eliminating supply chain risk associated with the obsolete original component. Both parts operate across the identical -20°C to 70°C temperature range.

Packaging Consideration: The substitute is supplied in Tape & Reel format, which may require adjustment to procurement and handling procedures if the original bulk packaging was specified.

Selection of the 9B-28.63636MEEJ-B eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the 9B-28.63636MEEJ-B be used as a direct replacement for the 9B-28.63636MAAJ-B?

A: Yes. The substitute part meets all mandatory electrical and mechanical parameters: identical frequency (28.63636 MHz), load capacitance (18pF), ESR (30 Ohms), operating mode (Fundamental), temperature range (-20°C to 70°C), and through-hole mounting. Physical dimensions and PCB footprint are identical.

Q: What is the difference between HC-49/US and HC-49S packages?

A: Both are HC-49 series through-hole crystal packages with identical external dimensions (11.50 x 5.00 mm) and maximum seated height (3.68 mm). HC-49S represents a variant designation. Both are mechanically compatible with the same PCB footprint.

Q: Does the improved frequency stability of the substitute part affect circuit design?

A: No. The substitute's ±10ppm stability is superior to the original ±30ppm specification. Circuits designed for ±30ppm tolerance will operate within specification with the improved ±10ppm substitute. No circuit redesign is required.

Q: What is the impact of the different packaging format (Tape & Reel vs. Bulk)?

A: Tape & Reel packaging affects procurement, storage, and assembly handling procedures but does not impact electrical or mechanical performance. Verify that assembly equipment and processes support Tape & Reel format components.

Q: Are there compliance differences between the main part and substitute?

A: Both parts are RoHS compliant. The substitute provides active product status versus obsolete status for the original, reducing long-term supply chain risk. REACH compliance information is available upon request for the substitute part.

Q: What is the inventory status for the substitute part?

A: The 9B-28.63636MEEJ-B has 1227 pieces in stock as new original inventory, compared to 861 pieces for the obsolete original part.