9B-10.000MAAJ-B Crystal Oscillator Equivalent & Substitute Parts

Part Overview

The 9B-10.000MAAJ-B is a 10 MHz through-hole crystal manufactured by TXC CORPORATION in HC-49/US package format. This part is classified as obsolete product status. The 10 MHz fundamental mode crystal with 18pF load capacitance and 40 Ohms ESR is designed for applications requiring precise frequency reference in the 10 MHz band with ±30ppm stability across the -20°C to 70°C operating temperature range. Due to obsolete status, equivalent substitute parts with matching electrical and mechanical specifications are necessary for design continuity and procurement alternatives.

Substiute Parts

9B-10.000MAAJ-B

TXC CORPORATIONIn Stock: 12959B-10.000MAAJ-B Datasheet

Current PartRFQ

HC49US-FF3F18-10.000MHZ

ILSIIn Stock: 2074HC49US-FF3F18-10.000MHZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 9B-10.000MAAJ-B is determined by strict alignment of the following parameters:

Critical Matching Parameters:

• Frequency: 10.0000 MHz (exact match required)
• Load Capacitance: 18 pF (exact match required)
• Operating Mode: Fundamental (exact match required)
• Package / Case: HC-49/US (exact match required)
• Mounting Type: Through Hole (exact match required)

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): Substitute parts may have ESR values within the range acceptable for the target oscillator circuit design. The main part specifies 40 Ohms; substitute parts with higher ESR values (up to 60 Ohms) remain functionally compatible provided the oscillator circuit design accommodates this variation.
• Frequency Stability: Must meet or exceed ±30 ppm specification
• Operating Temperature Range: Must cover or exceed -20°C to 70°C range

Compliance Parameters:

• RoHS Status: ROHS3 Compliant (required for regulatory alignment)
• ECCN and HTSUS codes must match for export/import classification

The HC49US-FF3F18-10.000MHZ manufactured by ILSI qualifies as a direct substitute based on matching all critical parameters while maintaining acceptable variation in ESR specification.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: HC49US-FF3F18-10.000MHZ (ILSI)

The HC49US-FF3F18-10.000MHZ is the qualified substitute for the obsolete 9B-10.000MAAJ-B based on the following engineering criteria:

1. Electrical Compatibility: All critical electrical parameters match exactly—frequency, load capacitance, operating mode, and frequency stability. The ESR difference (60 Ohms vs. 40 Ohms) represents an allowable variation within typical oscillator circuit design margins for HC-49/US package crystals.

2. Physical Compatibility: Both parts use HC-49/US through-hole package with dimensions within acceptable tolerance. The substitute dimensions (11.10mm L x 4.70mm W x 3.50mm H) are slightly smaller than the original (11.50mm L x 5.00mm W x 3.68mm H), ensuring PCB footprint compatibility without modification.

3. Regulatory Compliance: The substitute maintains ROHS3 compliance and matches ECCN/HTSUS classification, ensuring no change to supply chain or regulatory documentation requirements.

4. Product Status: The substitute is active product status, providing long-term availability and supply chain stability compared to the obsolete original part.

5. Operational Environment: Identical operating temperature range (-20°C to 70°C) ensures the substitute functions within the same environmental specifications as the original design.

The HC49US-FF3F18-10.000MHZ can be directly substituted in designs currently using the 9B-10.000MAAJ-B without circuit modification, provided the oscillator circuit design accommodates the specified ESR range.

Frequently Asked Questions (FAQ)

Q: Can the HC49US-FF3F18-10.000MHZ replace the 9B-10.000MAAJ-B without PCB modifications?

A: Yes. Both parts use the HC-49/US through-hole package with compatible pin spacing and footprint. The substitute dimensions are within tolerance of the original part, allowing direct PCB mounting without layout changes.

Q: What is the significance of the ESR difference (40 Ohms vs. 60 Ohms)?

A: ESR affects crystal oscillator startup time and power consumption. The 60 Ohms ESR of the substitute is higher than the original 40 Ohms. This variation is within acceptable limits for standard HC-49/US oscillator circuits. The oscillator circuit design must be verified to confirm it operates within the specified ESR range; however, most designs accommodate this variation without modification.

Q: Are the frequency and load capacitance specifications identical?

A: Yes. Both parts specify 10.0000 MHz frequency and 18 pF load capacitance. These critical parameters must match exactly for proper oscillator operation, and they do in this substitution.

Q: Does the substitute part have the same regulatory compliance?

A: Yes. The HC49US-FF3F18-10.000MHZ is ROHS3 compliant with matching ECCN (EAR99) and HTSUS (8541.60.0050) classifications. No changes to compliance documentation or supply chain procedures are required.

Q: Why is the original part obsolete?

A: The 9B-10.000MAAJ-B is classified as obsolete by TXC CORPORATION. The HC49US-FF3F18-10.000MHZ from ILSI is an active product with equivalent specifications, providing a viable long-term alternative for new designs and production continuity.

Q: Are there any temperature range differences?

A: No. Both parts operate across the identical temperature range of -20°C to 70°C, ensuring equivalent performance in the same environmental conditions.

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

A: The HC49US-FF3F18-10.000MHZ has 2007 pieces in stock as new original inventory, compared to 1260 pieces of the obsolete original part. The substitute offers better long-term availability.