LFXTAL012504 Equivalent & Substitute Parts Reference

Part Overview

The LFXTAL012504 is a 24 MHz fundamental mode crystal oscillator manufactured by IQD Frequency Products, designed for surface mount applications in the HC-49/US package. This active product operates across a temperature range of -10°C to 60°C with a frequency tolerance of ±30ppm and load capacitance of 16pF. The part is ROHS3 compliant and widely used in timing and frequency control applications requiring precise 24 MHz oscillation.

Substitute parts are identified when equivalent frequency, tolerance, operating mode, temperature range, and package specifications are maintained, allowing direct replacement in circuit designs without functional degradation.

Substiute Parts

LFXTAL012504

IQD Frequency ProductsIn Stock: 1590LFXTAL012504 Datasheet

Current PartRFQ

HCM4924000000ABJT

Citizen Finedevice Co LtdIn Stock: 48431HCM4924000000ABJT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LFXTAL012504 are identified based on strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 24.0000 MHz (exact match required)
• Frequency Tolerance: ±30ppm (accuracy class equivalence)
• Operating Mode: Fundamental (oscillation method)
• Package / Case: HC-49/US (mechanical and electrical interface)
• Mounting Type: Surface Mount (assembly compatibility)
• Operating Temperature Range: -10°C to 60°C (environmental specification)
• RoHS Status: ROHS3 Compliant (regulatory compliance)

Allowable Variation Parameters:

• Load Capacitance: 16pF to 18pF (minor variation acceptable within circuit design margins)
• ESR: 40 Ohms to 50 Ohms (minor variation acceptable for oscillator performance)
• Manufacturer: Different manufacturers permitted if all other parameters match

The HCM4924000000ABJT from Citizen Finedevice Co Ltd qualifies as a substitute part because it maintains all mandatory parameters while presenting minor variations in load capacitance (18pF vs. 16pF) and ESR (50 Ohms vs. 40 Ohms) that remain within acceptable engineering tolerances for typical crystal oscillator circuit designs.

Parameter Comparison

Engineering Selection Recommendations

LFXTAL012504 (Primary Part):

• Active product status with 1564 units in stock
• ROHS3 compliant and REACH unaffected
• 16pF load capacitance and 40 Ohm ESR provide baseline performance specifications
• Suitable for applications requiring IQD Frequency Products supply chain qualification

HCM4924000000ABJT (Substitute Part):

• Active product status with 48400 units in stock (significantly higher availability)
• ROHS3 compliant and REACH unaffected
• 18pF load capacitance and 50 Ohm ESR represent minor parameter variations
• Moisture Sensitivity Level 1 (Unlimited) indicates superior moisture handling compared to Not Applicable designation
• Suitable for applications where Citizen Finedevice Co Ltd supply chain qualification is acceptable and higher inventory availability is advantageous

Both parts maintain identical frequency, tolerance, operating mode, temperature range, and package specifications. Selection between these parts should be based on supply chain requirements, inventory availability, and manufacturer qualification status within the end application's design documentation.

Frequently Asked Questions (FAQ)

Q: Can HCM4924000000ABJT replace LFXTAL012504 in existing circuit designs?

A: Yes. Both parts operate at 24.0000 MHz with ±30ppm tolerance in fundamental mode within the -10°C to 60°C temperature range. The HC-49/US package and surface mount configuration are identical. The 2pF difference in load capacitance (16pF vs. 18pF) and 10 Ohm difference in ESR (40 vs. 50 Ohms) fall within acceptable design margins for standard crystal oscillator circuits. Circuit validation should confirm oscillator startup and frequency stability remain within specification.

Q: What is the significance of the load capacitance difference?

A: Load capacitance affects the crystal's resonant frequency in the oscillator circuit. The 16pF specification of LFXTAL012504 and 18pF specification of HCM4924000000ABJT require matching load capacitance in the oscillator circuit design. If the circuit is designed for 16pF load capacitance, the substitute part's 18pF specification may require minor tuning adjustments to maintain the target 24 MHz frequency within ±30ppm tolerance.

Q: What does the ESR difference mean for circuit performance?

A: Equivalent Series Resistance affects oscillator startup time and power consumption. The LFXTAL012504 at 40 Ohms provides lower resistance compared to HCM4924000000ABJT at 50 Ohms. This 10 Ohm difference may result in slightly longer startup transients with the substitute part but does not prevent functional operation in standard applications.

Q: Are both parts RoHS compliant?

A: Yes. Both LFXTAL012504 and HCM4924000000ABJT are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the difference between "Frequency Stability" and "Frequency Tolerance"?

A: Frequency Stability (±50ppm) defines the maximum frequency variation across the operating temperature range (-10°C to 60°C). Frequency Tolerance (±30ppm) defines the initial accuracy of the crystal at room temperature. Both parts share identical specifications for both parameters.

Q: Why does HCM4924000000ABJT have a Moisture Sensitivity Level while LFXTAL012504 does not?

A: Moisture Sensitivity Level (MSL) 1 (Unlimited) for HCM4924000000ABJT indicates the part can be stored indefinitely without moisture baking requirements. LFXTAL012504 lists MSL as Not Applicable, suggesting different moisture handling classifications between manufacturers. For applications with extended storage or high-humidity environments, the defined MSL 1 rating of the substitute part may provide additional assurance.

Q: Can these parts be used interchangeably in production?

A: Interchangeability depends on circuit design specifications and supply chain qualification requirements. Both parts meet identical frequency, tolerance, operating mode, temperature range, and package specifications. However, the load capacitance and ESR differences require circuit validation to confirm oscillator performance remains within specification. Supply chain and manufacturer qualification documentation should be reviewed before implementing substitution in production designs.