LFXTAL059980 27 MHz Crystal Equivalent & Substitute Parts

Part Overview

The LFXTAL059980 is a 27 MHz fundamental mode crystal manufactured by IQD Frequency Products in HC-49/US surface mount package. This component is designed for applications requiring precise frequency generation with ±20ppm tolerance and 18pF load capacitance. The part is currently active in production with ROHS3 compliance and is available in tape and reel packaging for automated assembly.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across manufacturers, ensuring functional interchangeability in circuit applications without design modification.

Key Parameters

Parameter	Value	Unit
Frequency	27.0000	MHz
Frequency Tolerance	±20	ppm
Frequency Stability	±50	ppm
Load Capacitance	18	pF
ESR (Equivalent Series Resistance)	40	Ohms
Operating Mode	Fundamental	—
Operating Temperature Range	-20 to 70	°C
Mounting Type	Surface Mount	—
Package / Case	HC-49/US	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the LFXTAL059980 is determined by strict equivalence across the following critical parameters:

Frequency: 27.0000 MHz (exact match required)
Frequency Tolerance: ±20 ppm (determines circuit accuracy)
Load Capacitance: 18 pF (circuit design parameter)
ESR: 40 Ohms (affects oscillator performance)
Operating Mode: Fundamental (determines frequency generation method)
Operating Temperature Range: -20°C to 70°C (application environment compatibility)
Package / Case: HC-49/US (mechanical and electrical interface)
Mounting Type: Surface Mount (assembly process compatibility)

The ABLS-27.000MHZ-B2F-T from Abracon LLC meets all substitution criteria and is classified as a direct equivalent part.

Parameter Comparison

Parameter	LFXTAL059980 (IQD)	ABLS-27.000MHZ-B2F-T (Abracon)	Match Status
Frequency	27.0000 MHz	27.0000 MHz	Equivalent
Frequency Tolerance	±20 ppm	±20 ppm	Equivalent
Frequency Stability	±50 ppm	±50 ppm	Equivalent
Load Capacitance	18 pF	18 pF	Equivalent
ESR	40 Ohms	40 Ohms	Equivalent
Operating Mode	Fundamental	Fundamental	Equivalent
Operating Temperature	-20°C to 70°C	-20°C to 70°C	Equivalent
Package / Case	HC-49/US	HC-49/US	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Physical Dimensions (L x W)	11.40 x 4.90 mm	11.40 x 4.70 mm	Compatible
Height - Seated (Max)	4.30 mm	4.20 mm	Compatible

Engineering Selection Recommendations

Both the LFXTAL059980 and ABLS-27.000MHZ-B2F-T are active production parts with ROHS3 compliance. Selection between these parts is based on the following factors:

LFXTAL059980 (IQD Frequency Products): Inventory availability is 1096 pieces. This part is REACH Unaffected, which may be advantageous in supply chain scenarios where REACH compliance documentation is not required.

ABLS-27.000MHZ-B2F-T (Abracon LLC): Inventory availability is 2068 pieces. This part is REACH Affected, indicating full compliance with REACH regulations. The slightly reduced physical dimensions (width 4.70 mm vs. 4.90 mm, height 4.20 mm vs. 4.30 mm) provide marginal space savings in compact PCB layouts.

Both parts are functionally interchangeable in circuit applications. Selection should be based on inventory availability, supply chain requirements, and REACH compliance status of the end application.

Frequently Asked Questions (FAQ)

Q: Can ABLS-27.000MHZ-B2F-T be used as a direct replacement for LFXTAL059980?

A: Yes. Both parts are 27 MHz fundamental mode crystals with identical electrical specifications (±20 ppm tolerance, 18 pF load capacitance, 40 Ohms ESR) and operate across the same temperature range (-20°C to 70°C). The HC-49/US package and surface mount configuration are identical. Physical dimensions are within compatible tolerances.

Q: What are the critical parameters that determine substitution eligibility?

A: Substitution requires exact equivalence in frequency (27.0000 MHz), frequency tolerance (±20 ppm), load capacitance (18 pF), ESR (40 Ohms), operating mode (Fundamental), temperature range (-20°C to 70°C), package type (HC-49/US), and mounting method (Surface Mount).

Q: Are there differences in physical dimensions between these parts?

A: Minor dimensional variations exist. The ABLS-27.000MHZ-B2F-T is slightly narrower (4.70 mm vs. 4.90 mm) and shorter (4.20 mm vs. 4.30 mm). These differences are within standard manufacturing tolerances and do not affect PCB layout compatibility for HC-49/US footprints.

Q: What is the difference between frequency tolerance and frequency stability?

A: Frequency tolerance (±20 ppm) specifies the initial accuracy of the crystal at room temperature. Frequency stability (±50 ppm) defines the maximum frequency variation across the entire operating temperature range (-20°C to 70°C).

Q: Does REACH compliance affect part selection?

A: REACH compliance status does not affect electrical or mechanical performance. The LFXTAL059980 is REACH Unaffected, while the ABLS-27.000MHZ-B2F-T is REACH Affected. Selection depends on end-application regulatory requirements and supply chain documentation needs.

Q: Can these crystals be used interchangeably in existing PCB designs?

A: Yes. Both parts use the HC-49/US package with identical electrical interfaces and surface mount configuration. No circuit design changes or PCB layout modifications are required for substitution.

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