9B25000004 Crystal Equivalent & Substitute Parts

Part Overview

The 9B25000004 is a 25 MHz through-hole crystal manufactured by TXC CORPORATION, designed for fundamental mode operation with 18pF load capacitance and 30 Ohms equivalent series resistance. This component operates across the industrial temperature range of -40°C to 85°C and is housed in the HC-49/US package format.

The 9B25000004 carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring 25 MHz crystal oscillators with identical electrical and mechanical specifications.

Substiute Parts

9B25000004

TXC CORPORATIONIn Stock: 282739B25000004 Datasheet

Current PartRFQ

HC49US-FF5F18-25.000MHZ

ILSIIn Stock: 1228HC49US-FF5F18-25.000MHZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 9B25000004 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Frequency: 25.0000 MHz (exact match)
• Frequency Stability: ±30 ppm (exact match)
• Load Capacitance: 18 pF (exact match)
• Equivalent Series Resistance: 30 Ohms (exact match)
• Operating Mode: Fundamental (exact match)

Mechanical Equivalence Requirements:

• Package / Case: HC-49/US (exact match)
• Mounting Type: Through Hole (exact match)
• Operating Temperature Range: -40°C to 85°C (exact match)

Compliance Requirements:

• RoHS3 Compliance (mandatory for new designs)
• ECCN and HTSUS classifications (for regulatory alignment)

The substitute part HC49US-FF5F18-25.000MHZ from ILSI meets all electrical and mechanical equivalence criteria. Dimensional variations within the HC-49/US package envelope do not affect functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: HC49US-FF5F18-25.000MHZ (ILSI)

The HC49US-FF5F18-25.000MHZ is a direct functional equivalent to the obsolete 9B25000004. Both components share identical electrical specifications (25 MHz, ±30 ppm stability, 18 pF load capacitance, 30 Ohms ESR) and mechanical form factor (HC-49/US through-hole package).

The ILSI substitute carries an Active product status, ensuring ongoing availability and supply chain continuity. Both parts maintain ROHS3 compliance and identical regulatory classifications (EAR99, HTSUS 8541.60.0060), supporting seamless integration into existing designs and procurement workflows.

Dimensional differences between the two parts (length 11.50 mm vs. 11.10 mm; width 5.00 mm vs. 4.70 mm; height 3.68 mm vs. 3.50 mm) remain within the HC-49/US package specification envelope and do not affect PCB layout compatibility or functional performance.

Frequently Asked Questions (FAQ)

Q: Can the HC49US-FF5F18-25.000MHZ directly replace the 9B25000004 in existing designs?

A: Yes. Both components are electrically and mechanically equivalent across all critical parameters: 25 MHz frequency, ±30 ppm stability, 18 pF load capacitance, 30 Ohms ESR, fundamental mode operation, and HC-49/US through-hole package. No circuit modifications are required.

Q: What is the significance of the obsolete status of the 9B25000004?

A: Obsolete status indicates that TXC CORPORATION has discontinued manufacturing and support for this part. The HC49US-FF5F18-25.000MHZ from ILSI provides an active, supported alternative with identical specifications.

Q: Are there dimensional differences between these parts, and do they matter?

A: Minor dimensional variations exist within the HC-49/US package envelope (approximately 0.4 mm differences in length and width). These variations fall within standard package tolerances and do not affect PCB footprint compatibility or electrical performance.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the 9B25000004 and HC49US-FF5F18-25.000MHZ are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8541.60.0060) classifications, supporting equivalent regulatory and export compliance.

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

A: The 9B25000004 lists MSL as Not Applicable, while the HC49US-FF5F18-25.000MHZ specifies MSL 1 (Unlimited). MSL 1 indicates the component has no moisture sensitivity restrictions and requires no special handling or storage conditions.

Q: How do I verify compatibility before implementing the substitute?

A: Confirm that your application circuit requires exactly 25 MHz frequency, ±30 ppm stability, 18 pF load capacitance, and 30 Ohms ESR. Verify that your PCB layout accommodates the HC-49/US through-hole package. Both conditions are met by the HC49US-FF5F18-25.000MHZ.