LFXTAL026548 24 MHz Crystal Equivalent & Substitute Parts

Part Overview

The LFXTAL026548 is a 24 MHz surface mount crystal oscillator manufactured by IQD Frequency Products. This fundamental mode crystal operates at 24.0000 MHz with ±30 ppm frequency tolerance and 18 pF load capacitance in an HC-49/US package. The part is Active status and ROHS3 compliant, designed for applications requiring stable frequency reference in compact surface mount form factor. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the critical parameters that define crystal interchangeability.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Frequency	24.0000	MHz	Critical - Must match exactly
Frequency Tolerance	±30	ppm	Critical - Determines accuracy class
Load Capacitance	18	pF	Critical - Circuit design parameter
ESR (Equivalent Series Resistance)	40	Ohms	Critical - Oscillator startup and stability
Operating Mode	Fundamental	-	Critical - Frequency generation method
Package / Case	HC-49/US	-	Critical - Physical and electrical compatibility
Mounting Type	Surface Mount	-	Critical - Assembly process compatibility
Operating Temperature Range	-20°C ~ 70°C	-	Important - Application environment
Frequency Stability	±50	ppm	Important - Temperature drift specification

Substitute Part Grouping Explanation

Substitution eligibility for the LFXTAL026548 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Frequency: 24.0000 MHz (exact match required)
Frequency Tolerance: ±30 ppm (defines accuracy class)
Load Capacitance: 18 pF (circuit design requirement)
ESR: 40 Ohms (oscillator performance requirement)
Operating Mode: Fundamental (frequency generation method)
Package / Case: HC-49/US (mechanical and electrical interface)
Mounting Type: Surface Mount (assembly compatibility)

Compatible Range Parameters:

Operating Temperature Range: -20°C ~ 70°C or wider
Frequency Stability: ±50 ppm or better

The identified substitute parts ABLS-24.000MHZ-B4-T (Abracon LLC) and E1SEA18-24.000M TR (Ecliptek) meet all mandatory matching parameters and are therefore electrically and mechanically interchangeable with the LFXTAL026548 in applications where these specifications are required.

Parameter Comparison

Parameter	LFXTAL026548 (IQD)	ABLS-24.000MHZ-B4-T (Abracon)	E1SEA18-24.000M TR (Ecliptek)
Manufacturer	IQD Frequency Products	Abracon LLC	Ecliptek
Frequency	24.0000 MHz	24.0000 MHz	24.0000 MHz
Frequency Tolerance	±30 ppm	±30 ppm	±30 ppm
Load Capacitance	18 pF	18 pF	18 pF
ESR	40 Ohms	40 Ohms	40 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental
Package / Case	HC-49/US	HC-49/US	HC-49/US
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-20°C ~ 70°C	-20°C ~ 70°C	-20°C ~ 70°C
Frequency Stability	±50 ppm	±50 ppm	±50 ppm
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three parts—LFXTAL026548, ABLS-24.000MHZ-B4-T, and E1SEA18-24.000M TR—are Active status products with ROHS3 compliance and identical electrical specifications. Selection between these parts may be based on the following factors:

Availability and Lead Time: ABLS-24.000MHZ-B4-T (Abracon) has the highest inventory at 15,964 pieces. LFXTAL026548 (IQD) has 1,026 pieces in stock. E1SEA18-24.000M TR (Ecliptek) has 1,785 pieces available.

Regulatory Compliance: LFXTAL026548 and E1SEA18-24.000M TR are REACH Unaffected. ABLS-24.000MHZ-B4-T is REACH Affected. All three parts carry EAR99 ECCN classification and identical HTSUS code 8541.60.0060.

Physical Dimensions: Minor dimensional variations exist within the HC-49/US package specification. LFXTAL026548 measures 0.449" L × 0.150" W (11.40mm × 3.80mm) with 0.169" max height. ABLS-24.000MHZ-B4-T measures 0.449" L × 0.185" W (11.40mm × 4.70mm) with 0.165" max height. E1SEA18-24.000M TR measures 0.524" L × 0.191" W (13.30mm × 4.85mm) with 0.126" max height. These variations remain within HC-49/US package tolerance and do not affect electrical interchangeability.

Moisture Sensitivity: LFXTAL026548 and ABLS-24.000MHZ-B4-T are Not Applicable for MSL. E1SEA18-24.000M TR is rated MSL 1 (Unlimited), indicating superior moisture resistance.

Frequently Asked Questions (FAQ)

Q: Can ABLS-24.000MHZ-B4-T be used as a direct replacement for LFXTAL026548?

A: Yes. Both parts share identical electrical specifications: 24.0000 MHz frequency, ±30 ppm tolerance, 18 pF load capacitance, 40 Ohms ESR, and HC-49/US package. Physical dimensions vary slightly but remain within package specification. No circuit modifications are required.

Q: What is the significance of the ±30 ppm frequency tolerance specification?

A: Frequency tolerance defines the maximum deviation from the nominal 24.0000 MHz at room temperature (typically 25°C). All three substitute parts maintain ±30 ppm tolerance, ensuring equivalent accuracy performance in applications requiring this specification class.

Q: How does load capacitance affect substitution compatibility?

A: Load capacitance (18 pF) is a circuit design parameter that determines the oscillator's resonant frequency when connected to specific circuit impedance. All substitute parts specify identical 18 pF load capacitance, ensuring the crystal will oscillate at the correct frequency in the same circuit configuration.

Q: Why is ESR (Equivalent Series Resistance) critical for substitution?

A: ESR affects oscillator startup behavior, power consumption, and frequency stability. The 40 Ohms ESR specification is identical across all three parts, ensuring equivalent oscillator performance characteristics and startup reliability.

Q: Are there differences in operating temperature range between these parts?

A: All three parts specify -20°C ~ 70°C operating temperature range. This identical specification ensures equivalent thermal performance across the full operating environment.

Q: What does "Fundamental" operating mode mean?

A: Fundamental mode indicates the crystal oscillates at its primary resonant frequency (24.0000 MHz) without harmonic multiplication. All substitute parts operate in fundamental mode, confirming frequency generation method equivalence.

Q: Do physical dimension differences affect PCB layout compatibility?

A: The HC-49/US package specification accommodates the dimensional variations present in these three parts. All parts use identical surface mount footprint and solder pad configuration. Minor length and width variations do not require PCB layout changes.

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

A: Frequency Tolerance (±30 ppm) specifies maximum deviation at room temperature. Frequency Stability (±50 ppm) specifies maximum deviation across the full operating temperature range (-20°C ~ 70°C). All parts meet both specifications identically.

Q: Is REACH compliance status relevant for substitution decisions?

A: REACH status indicates regulatory compliance in specific markets. LFXTAL026548 and E1SEA18-24.000M TR are REACH Unaffected. ABLS-24.000MHZ-B4-T is REACH Affected. Selection may depend on end-use market requirements, but this does not affect electrical or mechanical interchangeability.

Q: Can these parts be used interchangeably in production without design changes?

A: Yes. All three parts are electrically and mechanically equivalent. No circuit modifications, PCB layout changes, or firmware updates are required for substitution. Parts can be used interchangeably based on availability and supply chain considerations.

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