LFXTAL059539 48 MHz Crystal Equivalent & Substitute Parts

Part Overview

The LFXTAL059539 is a 48 MHz fundamental mode crystal oscillator manufactured by IQD Frequency Products, designed for surface mount applications in the CFPX-104 series. This active product features an 18pF load capacitance, 100 Ohms equivalent series resistance (ESR), and operates across the -40°C to 85°C temperature range. The component is packaged in a 4-SMD, No Lead configuration with RoHS3 compliance. Substitute parts are identified when equivalent electrical and mechanical parameters align with application requirements, enabling component interchangeability in circuit designs where the primary part becomes unavailable or when alternative sourcing is necessary.

Key Parameters

Parameter	Value	Unit
Frequency	48.0000	MHz
Frequency Tolerance	±20	ppm
Frequency Stability	±30	ppm
Load Capacitance	18	pF
ESR (Equivalent Series Resistance)	100	Ohms
Operating Mode	Fundamental	—
Operating Temperature Range	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	4-SMD, No Lead	—
Size / Dimension	5.00 x 3.20	mm
Height - Seated (Max)	1.00	mm
RoHS Status	ROHS3 Compliant	—
Packaging	Tape & Reel (TR)	—

Substitute Part Grouping Explanation

Substitution eligibility for the LFXTAL059539 is determined by strict alignment of the following critical parameters:

Core Electrical Parameters (Must Match):

Frequency: 48.0000 MHz
Frequency Tolerance: ±20 ppm
Load Capacitance: 18 pF
Operating Mode: Fundamental
Operating Temperature Range: -40°C to 85°C

Mechanical Parameters (Must Match):

Mounting Type: Surface Mount
Package / Case: 4-SMD, No Lead
Packaging Format: Tape & Reel (TR)

Variable Parameters (Allowed to Differ):

ESR (Equivalent Series Resistance): Acceptable range determined by circuit design requirements
Physical Dimensions: Variations permitted within PCB layout constraints
Height - Seated: Variations permitted within assembly clearance specifications
Manufacturer: Different manufacturers acceptable if electrical and mechanical specifications align

All substitute parts listed below satisfy the core electrical and mechanical requirements, enabling direct substitution in applications where the LFXTAL059539 is specified.

Parameter Comparison

Parameter	LFXTAL059539 (Main)	LFXTAL053866	ABM8G-48.000MHZ-18-D2Y-T	ECS-480-18-33-JGN-TR
Manufacturer	IQD Frequency Products	IQD Frequency Products	Abracon LLC	ECS Inc.
Series	CFPX-104	CFPX-180	ABM8G	ECX-32
Frequency	48.0000 MHz	48.0000 MHz	48.0000 MHz	48.0000 MHz
Frequency Tolerance	±20 ppm	±20 ppm	±20 ppm	±20 ppm
Frequency Stability	±30 ppm	±30 ppm	±30 ppm	±30 ppm
Load Capacitance	18 pF	18 pF	18 pF	18 pF
ESR	100 Ohms	35 Ohms	50 Ohms	40 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental	Fundamental
Operating Temperature	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Size / Dimension	5.00 x 3.20 mm	3.20 x 2.50 mm	3.20 x 2.50 mm	3.20 x 2.50 mm
Height - Seated (Max)	1.00 mm	0.80 mm	1.00 mm	0.80 mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected	REACH Unaffected
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All four parts listed in this reference maintain active product status and comply with RoHS3 requirements, confirming their suitability for current manufacturing environments. Selection among these substitutes is based on the following engineering considerations:

LFXTAL053866 (IQD Frequency Products, CFPX-180 Series): This substitute offers the lowest ESR at 35 Ohms and maintains REACH Unaffected status. The reduced physical footprint (3.20 x 2.50 mm versus 5.00 x 3.20 mm) and lower seated height (0.80 mm) provide advantages in space-constrained PCB layouts. Direct electrical equivalence with the main part is confirmed across all critical parameters.

ABM8G-48.000MHZ-18-D2Y-T (Abracon LLC, ABM8G Series): This substitute provides 50 Ohms ESR with matched seated height (1.00 mm) to the main part, supporting designs where height clearance is critical. The smaller footprint (3.20 x 2.50 mm) reduces PCB area consumption. Note that REACH Affected status requires compliance verification for applications subject to REACH regulations.

ECS-480-18-33-JGN-TR (ECS Inc., ECX-32 Series): This substitute delivers 40 Ohms ESR with the lowest seated height (0.80 mm) and maintains REACH Unaffected status. The compact footprint (3.20 x 2.50 mm) and MSL rating of 1 (Unlimited) support high-volume manufacturing environments with extended storage requirements.

All substitutes maintain electrical equivalence in frequency, tolerance, stability, load capacitance, operating mode, and temperature range. Physical dimension variations are acceptable where PCB layout and assembly clearance specifications permit.

Frequently Asked Questions (FAQ)

Q: Can LFXTAL053866 replace LFXTAL059539 in my circuit?

A: Yes. Both parts share identical electrical specifications: 48 MHz frequency, ±20 ppm tolerance, ±30 ppm stability, 18 pF load capacitance, fundamental operating mode, and -40°C to 85°C temperature range. The lower ESR (35 Ohms versus 100 Ohms) and smaller physical dimensions (3.20 x 2.50 mm versus 5.00 x 3.20 mm) are compatible with circuit designs accepting these variations. Verify PCB layout accommodates the smaller footprint.

Q: What is the difference in ESR between these parts, and does it matter?

A: ESR values vary across the substitute group: LFXTAL059539 (100 Ohms), LFXTAL053866 (35 Ohms), ABM8G-48.000MHZ-18-D2Y-T (50 Ohms), and ECS-480-18-33-JGN-TR (40 Ohms). Lower ESR reduces power dissipation and improves frequency stability in oscillator circuits. Circuit design determines acceptable ESR ranges; consult your oscillator IC datasheet for ESR specifications and load requirements.

Q: Are there physical dimension constraints I should consider?

A: Yes. The main part LFXTAL059539 measures 5.00 x 3.20 mm with 1.00 mm seated height. Substitutes LFXTAL053866, ABM8G-48.000MHZ-18-D2Y-T, and ECS-480-18-33-JGN-TR use a smaller 3.20 x 2.50 mm footprint. Verify your PCB layout and component placement files accommodate the selected part's dimensions. Height clearance above the crystal must also be confirmed for all variants.

Q: Do all substitutes meet RoHS3 compliance?

A: Yes. All four parts carry RoHS3 Compliant status, confirming compliance with Restriction of Hazardous Substances Directive requirements for current manufacturing.

Q: What is the REACH status difference, and when does it matter?

A: Three parts (LFXTAL059539, LFXTAL053866, ECS-480-18-33-JGN-TR) are REACH Unaffected. ABM8G-48.000MHZ-18-D2Y-T is REACH Affected, requiring compliance verification for applications subject to REACH regulations. Consult your regulatory requirements and supply chain policies before selecting the Abracon part.

Q: Can I use these parts interchangeably on the same PCB?

A: Electrical interchangeability is confirmed. Mechanical interchangeability depends on PCB layout design. The smaller footprint substitutes (3.20 x 2.50 mm) require PCB pads and placement designed for that dimension. Existing PCB layouts designed for the 5.00 x 3.20 mm main part may not accommodate smaller substitutes without redesign. Consult your PCB design files and assembly guidelines.

Q: Which substitute offers the best performance?

A: Performance depends on application requirements. LFXTAL053866 offers the lowest ESR (35 Ohms) and smallest height (0.80 mm). ABM8G-48.000MHZ-18-D2Y-T matches the main part's height (1.00 mm) while reducing footprint. ECS-480-18-33-JGN-TR balances moderate ESR (40 Ohms) with lowest height (0.80 mm) and REACH Unaffected status. Select based on your circuit's ESR requirements, PCB space constraints, and regulatory compliance needs.

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