9B-4.9152MAAJ-B Equivalent & Substitute Parts

Part Overview

The 9B-4.9152MAAJ-B is a through-hole MHz crystal manufactured by TXC CORPORATION, operating at 4.9152 MHz with ±30ppm frequency stability and 18pF load capacitance. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. The HC-49/US package format and fundamental operating mode define its primary application scope in timing and frequency control circuits.

Substiute Parts

9B-4.9152MAAJ-B

TXC CORPORATIONIn Stock: 7649B-4.9152MAAJ-B Datasheet

Current PartRFQ

HC49US-FF3F18-4.9152MHZ

ILSIIn Stock: 1179HC49US-FF3F18-4.9152MHZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 9B-4.9152MAAJ-B is determined by strict equivalence across the following critical parameters:

• Frequency: 4.9152 MHz (exact match required)
• Frequency Stability: ±30ppm (tolerance specification)
• Load Capacitance: 18pF (circuit design requirement)
• ESR: 150 Ohms (impedance matching requirement)
• Operating Mode: Fundamental (circuit topology requirement)
• Package / Case: HC-49/US (mechanical and electrical interface requirement)
• Mounting Type: Through Hole (PCB assembly requirement)
• Operating Temperature Range: -20°C to 70°C (environmental specification)

The HC49US-FF3F18-4.9152MHZ manufactured by ILSI meets all substitution criteria. This part is classified as active product status, providing supply continuity for the obsolete 9B-4.9152MAAJ-B.

Parameter Comparison

Engineering Selection Recommendations

The HC49US-FF3F18-4.9152MHZ from ILSI is the direct functional equivalent for the obsolete 9B-4.9152MAAJ-B. Selection is based on the following engineering factors:

Electrical Equivalence: All critical electrical parameters match exactly, including frequency, stability, load capacitance, and ESR. Circuit performance will be identical.

Mechanical Compatibility: Both parts use the HC-49/US package with through-hole mounting. Dimensional variations (11.50mm vs 11.10mm length; 3.68mm vs 3.50mm height) remain within standard PCB design tolerances for this package class.

Compliance Status: Both parts are ROHS3 compliant and carry identical ECCN and HTSUS classifications. The ILSI part is REACH Unaffected, providing regulatory advantage over the TXC part.

Supply Continuity: The ILSI part is active product status with 1131 units in stock, ensuring long-term availability compared to the obsolete TXC part.

Frequently Asked Questions (FAQ)

Q: Can HC49US-FF3F18-4.9152MHZ replace 9B-4.9152MAAJ-B in existing designs?

A: Yes. All electrical parameters are identical. Mechanical dimensions are within standard HC-49/US package tolerances. Direct substitution is supported without circuit modification.

Q: Are there dimensional concerns with the slightly smaller ILSI part?

A: No. The ILSI part measures 11.10mm length versus 11.50mm for the TXC part, and 3.50mm height versus 3.68mm. These variations fall within standard HC-49/US package specifications and do not affect PCB footprint compatibility or electrical performance.

Q: What is the difference in MSL (Moisture Sensitivity Level) between the two parts?

A: The TXC part lists MSL as Not Applicable. The ILSI part specifies MSL 1 (Unlimited), indicating superior moisture tolerance. This provides handling and storage advantages for the ILSI part.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both parts operate across -20°C to 70°C, ensuring identical thermal performance in target applications.

Q: Why is the ILSI part listed as REACH Unaffected while the TXC part is REACH Affected?

A: This reflects current regulatory classification status. The ILSI part's REACH Unaffected status simplifies compliance documentation for EU-regulated applications.

Q: Is there any performance difference between the two crystals?

A: No. Frequency, stability, load capacitance, ESR, and operating mode are identical. Both parts deliver equivalent circuit performance.