LFXTAL081865 26 MHz Crystal Equivalent & Substitute Parts

Part Overview

The LFXTAL081865 is a 26 MHz fundamental mode crystal manufactured by IQD Frequency Products in the CFPX-218 series. This surface mount device operates at ±10ppm frequency stability with 10pF load capacitance and 100 Ohms equivalent series resistance (ESR). The part is actively produced, RoHS3 compliant, and carries MSL 1 (unlimited moisture sensitivity level) rating. Substitute parts are identified based on matching frequency, stability, load capacitance tolerance, ESR compatibility, and surface mount package specifications.

Key Parameters

Parameter	Value
Frequency	26 MHz
Frequency Stability	±10ppm
Load Capacitance	10pF
ESR (Equivalent Series Resistance)	100 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-20°C to 70°C
Mounting Type	Surface Mount
Package / Case	4-SMD, No Lead
Size / Dimension	0.098" L x 0.079" W (2.50mm x 2.00mm)
Height - Seated (Max)	0.024" (0.60mm)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Matching Parameters:

Frequency: 26 MHz (exact match required)
Frequency Stability: ±10ppm (exact match required)
Operating Mode: Fundamental (exact match required)
Operating Temperature Range: -20°C to 70°C (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: 4-SMD, No Lead (exact match required)

Secondary Compatibility Parameters:

Load Capacitance: 10pF (primary), 8pF, 7pF (acceptable with circuit design verification)
ESR: 100 Ohms (primary), 50 Ohms, 60 Ohms (acceptable with circuit impedance compatibility)
Physical Dimensions: Variations permitted within PCB layout constraints
RoHS/REACH Compliance: Must maintain regulatory status

Substitute parts are grouped into two categories: direct equivalents (matching all primary and secondary parameters) and compatible alternatives (matching primary parameters with acceptable load capacitance or ESR variations).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency	Frequency Stability	Load Capacitance	ESR (Ohms)	Size (mm)	Height Max (mm)	RoHS Status	Inventory
LFXTAL081865	IQD Frequency Products	26 MHz	±10ppm	10pF	100	2.50 x 2.00	0.60	ROHS3	810 Pcs
8Z-26.000MEEQ-T	TXC CORPORATION	26 MHz	±10ppm	10pF	100	2.50 x 2.00	0.55	RoHS	31254 Pcs
8Q-26.000MEEY-T	FTS	26 MHz	±10ppm	7pF	100	1.60 x 1.20	0.40	RoHS	3705 Pcs
ABM10W-26.0000MHZ-7-B1U-T3	Abracon LLC	26 MHz	±10ppm	7pF	50	2.50 x 2.00	0.60	ROHS3	3379 Pcs
ABM10W-26.0000MHZ-8-B1U-T3	Abracon LLC	26 MHz	±10ppm	8pF	50	2.50 x 2.00	0.60	ROHS3	874 Pcs
ABM11-26.000MHZ-B1U-T	Abracon LLC	26 MHz	±10ppm	10pF	100	2.00 x 1.60	0.59	ROHS3	1527 Pcs
ABM12-115-26.000MHZ-T3	Abracon LLC	26 MHz	±10ppm	8pF	100	1.65 x 1.25	0.40	ROHS3	14269 Pcs
ABM12W-26.0000MHZ-7-B1U-T3	Abracon LLC	26 MHz	±10ppm	7pF	100	1.60 x 1.20	0.40	ROHS3	1616 Pcs
ABM12W-26.0000MHZ-8-B1U-T3	Abracon LLC	26 MHz	±10ppm	8pF	100	1.60 x 1.20	0.40	ROHS3	1125 Pcs
ECS-260-12-37-CKM-TR	ECS Inc.	26 MHz	±10ppm	12pF	60	2.00 x 1.60	0.55	ROHS3	1665 Pcs
ECS-260-8-37CKM	ECS Inc.	26 MHz	±10ppm	8pF	60	2.00 x 1.60	0.55	ROHS3	1539 Pcs

Engineering Selection Recommendations

Direct Equivalent (Preferred): The 8Z-26.000MEEQ-T from TXC CORPORATION is the primary direct substitute. It matches all electrical parameters (26 MHz, ±10ppm, 10pF load capacitance, 100 Ohms ESR) and maintains identical package specifications. This part carries RoHS compliance and has the highest inventory availability (31254 units).

Compatible Alternatives with 10pF Load Capacitance: The ABM11-26.000MHZ-B1U-T from Abracon LLC provides 10pF load capacitance with 100 Ohms ESR, matching the primary electrical requirements. Physical dimensions differ slightly (2.00mm x 1.60mm vs. 2.50mm x 2.00mm), requiring PCB layout verification. ROHS3 compliance is maintained.

Compatible Alternatives with Reduced Load Capacitance (8pF): The ABM12-115-26.000MHZ-T3 and ABM12W-26.0000MHZ-8-B1U-T3 from Abracon LLC provide 8pF load capacitance with 100 Ohms ESR. These parts require circuit design verification to confirm load capacitance compatibility. Both maintain ROHS3 compliance and offer compact form factors.

Compatible Alternatives with Reduced ESR (50 Ohms): The ABM10W series (7pF and 8pF variants) from Abracon LLC feature 50 Ohms ESR instead of 100 Ohms. These parts are suitable for applications where lower impedance is acceptable. ROHS3 compliance is maintained.

Compatible Alternatives with Different Load Capacitance and ESR: The ECS-260 series from ECS Inc. offers 8pF or 12pF load capacitance with 60 Ohms ESR. These parts require circuit design verification for both load capacitance and impedance compatibility. ROHS3 compliance is maintained.

All substitute parts maintain the required operating temperature range (-20°C to 70°C), fundamental operating mode, and surface mount 4-SMD package configuration.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute crystal with different load capacitance? A: Load capacitance affects circuit resonant frequency and stability. Substitutes with 7pF, 8pF, or 12pF load capacitance require circuit design verification. The application circuit must be designed or adjusted to accommodate the alternative load capacitance value. Direct equivalents with 10pF load capacitance (such as 8Z-26.000MEEQ-T) eliminate this requirement.

Q: What is the impact of ESR differences between substitute parts? A: ESR affects crystal startup time, power consumption, and circuit stability. Substitutes with 50 Ohms or 60 Ohms ESR (versus the original 100 Ohms) may alter circuit performance. Applications designed for 100 Ohms ESR should prioritize substitutes maintaining this specification. Lower ESR values generally reduce power consumption but may require circuit tuning.

Q: Are all substitute parts RoHS compliant? A: All listed substitute parts maintain RoHS compliance (either RoHS or ROHS3 status). The original LFXTAL081865 is ROHS3 compliant. Abracon LLC and ECS Inc. substitutes maintain ROHS3 compliance. TXC CORPORATION and FTS parts carry RoHS compliance. Both certifications are acceptable for most applications.

Q: Do physical dimension differences affect PCB compatibility? A: The LFXTAL081865 measures 2.50mm x 2.00mm. Smaller alternatives (1.60mm x 1.20mm or 1.65mm x 1.25mm) fit existing footprints but may require PCB layout adjustment. Larger footprints are not compatible. Height variations (0.40mm to 0.60mm) are generally acceptable within standard PCB assembly tolerances.

Q: Which substitute offers the best inventory availability? A: The 8Z-26.000MEEQ-T from TXC CORPORATION provides the highest inventory (31254 units) while maintaining direct electrical equivalence to the LFXTAL081865.

Q: Can I mix different substitute parts in the same design? A: All listed substitutes operate at 26 MHz ±10ppm with identical frequency stability. However, mixing parts with different load capacitance or ESR values in the same circuit may introduce frequency drift or stability variations. Consistent part selection across production batches is recommended.

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