9B-20.000MAAJ-B Equivalent & Substitute Parts

Part Overview

The 9B-20.000MAAJ-B is a 20 MHz through-hole crystal oscillator manufactured by TXC CORPORATION. This component operates at a fundamental frequency with ±30ppm stability and 18pF load capacitance in an HC-49/US package. The part is classified as obsolete, making identification of equivalent substitute components necessary for ongoing design support, maintenance, and production continuity. Substitute parts must maintain identical electrical specifications and mechanical compatibility to ensure direct replacement without circuit redesign.

Substiute Parts

9B-20.000MAAJ-B

TXC CORPORATIONIn Stock: 7949B-20.000MAAJ-B Datasheet

Current PartRFQ

HC49US-FF3F18-20.000MHZ

ILSIIn Stock: 1046HC49US-FF3F18-20.000MHZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 9B-20.000MAAJ-B is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Frequency: 20 MHz (exact match required)
• Frequency Stability: ±30ppm (exact match required)
• Load Capacitance: 18pF (exact match required)
• ESR: 30 Ohms (exact match required)
• Operating Mode: Fundamental (exact match required)

Mechanical Equivalence Requirements:

• 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)

Compliance Requirements:

• RoHS3 Compliance (required for environmental standards)

Substitute parts meeting all these criteria are functionally interchangeable at the circuit level and mechanically compatible with existing PCB layouts and through-hole assembly processes.

Parameter Comparison

Engineering Selection Recommendations

The HC49US-FF3F18-20.000MHZ manufactured by ILSI is a direct electrical and mechanical equivalent to the obsolete 9B-20.000MAAJ-B. Both components share identical frequency, stability, load capacitance, ESR, operating mode, temperature range, and package specifications. The ILSI substitute maintains active product status, ensuring long-term availability and supply chain continuity.

Physical dimensions of the ILSI part are slightly smaller (0.437" x 0.185" versus 0.453" x 0.197"), with a reduced seated height (0.138" versus 0.145"). These dimensional differences remain within HC-49/US package tolerances and do not affect PCB layout compatibility or through-hole mounting procedures.

Both components are ROHS3 compliant and classified under identical ECCN and HTSUS codes, confirming regulatory and trade compliance equivalence. The ILSI substitute is suitable for direct replacement in applications currently using the TXC 9B-20.000MAAJ-B crystal.

Frequently Asked Questions (FAQ)

Q: Can the HC49US-FF3F18-20.000MHZ be used as a direct replacement for the 9B-20.000MAAJ-B?

A: Yes. Both components meet identical electrical specifications (20 MHz, ±30ppm stability, 18pF load capacitance, 30 Ohms ESR, fundamental mode) and mechanical requirements (HC-49/US package, through-hole mounting, -20°C to 70°C operating range). The substitute is electrically and mechanically interchangeable.

Q: Are there dimensional compatibility concerns between these two parts?

A: The ILSI substitute has slightly smaller dimensions (0.437" x 0.185" x 0.138" max height) compared to the TXC original (0.453" x 0.197" x 0.145" max height). Both dimensions fall within HC-49/US package specifications. The smaller size does not create PCB layout or assembly conflicts and may provide additional board space margin.

Q: What is the significance of the product status difference (Obsolete vs. Active)?

A: The TXC 9B-20.000MAAJ-B is classified as obsolete, indicating discontinued manufacturing and limited future availability. The ILSI HC49US-FF3F18-20.000MHZ maintains active status, ensuring reliable supply for current and future production requirements.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both components are ROHS3 compliant, share identical ECCN (EAR99) and HTSUS (8541.60.0050) classifications, and meet equivalent environmental and trade compliance requirements.

Q: Are there any differences in moisture sensitivity or handling requirements?

A: The TXC part lists MSL as Not Applicable. The ILSI substitute specifies MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. This represents an improvement in handling flexibility with no negative impact on component performance or reliability.

Q: What packaging format is available for the substitute part?

A: The ILSI HC49US-FF3F18-20.000MHZ is supplied in bulk packaging, suitable for production assembly and component inventory management.