FL3740015 37.4 MHz Crystal Equivalent & Substitute Parts

Part Overview

The FL3740015 is a 37.4 MHz fundamental mode crystal manufactured by Diodes Incorporated in the SaRonix-eCera™ FL series. This surface mount device is specified for 16pF load capacitance with 40 Ohms equivalent series resistance and operates across the -40°C to 85°C temperature range. The part is Active status and ROHS3 compliant. Substitute parts may be required due to inventory constraints, application-specific load capacitance requirements, or supply chain optimization.

Substiute Parts

FL3740015

Diodes IncorporatedIn Stock: 1164FL3740015 Datasheet

Current PartRFQ

FL3740009

Diodes IncorporatedIn Stock: 4179FL3740009 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The FL3740009 is qualified as a substitute for the FL3740015 based on the following critical parameters:

Matching parameters: Frequency (37.4 MHz), frequency tolerance (±10 ppm), frequency stability (±15 ppm), ESR (40 Ohms), operating mode (Fundamental), operating temperature range (-40°C to 85°C), package type (4-SMD, No Lead), physical dimensions (3.20 x 2.50 mm), height (0.75 mm), mounting type (Surface Mount), RoHS compliance (ROHS3), and MSL rating (1 - Unlimited).

Differing parameter: Load capacitance is specified as 12pF for FL3740009 versus 16pF for FL3740015. This difference requires circuit-level evaluation based on the application's load capacitance requirement.

Parameter Comparison

Engineering Selection Recommendations

Both FL3740015 and FL3740009 are Active status products from Diodes Incorporated with identical ROHS3 compliance and REACH unaffected status. Selection between these parts is determined by the circuit's load capacitance specification. The FL3740015 with 16pF load capacitance is appropriate for circuits designed to that specification. The FL3740009 with 12pF load capacitance serves applications requiring lower load capacitance. Both parts share identical frequency tolerance, stability, ESR, temperature range, and package characteristics, ensuring mechanical and thermal compatibility in surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can FL3740009 be used as a direct replacement for FL3740015?

A: Direct substitution depends on circuit load capacitance requirements. The FL3740009 specifies 12pF load capacitance while FL3740015 specifies 16pF. If the circuit is designed for 16pF load capacitance, the FL3740009 may not provide the intended frequency accuracy without circuit modification.

Q: What is the significance of load capacitance in crystal selection?

A: Load capacitance is the capacitive load the crystal oscillator circuit presents to the crystal. The crystal is frequency-trimmed to operate at its specified frequency under its rated load capacitance. Using a crystal with mismatched load capacitance will result in frequency deviation from specification.

Q: Are the physical packages identical?

A: Yes. Both FL3740015 and FL3740009 use the same 4-SMD, No Lead package with dimensions of 3.20 x 2.50 mm and maximum seated height of 0.75 mm. They are mechanically interchangeable on the PCB.

Q: Do both parts have the same temperature operating range?

A: Yes. Both parts operate across -40°C to 85°C with identical frequency stability of ±15 ppm and frequency tolerance of ±10 ppm.

Q: What is the ESR specification and does it differ between these parts?

A: ESR (Equivalent Series Resistance) is 40 Ohms for both FL3740015 and FL3740009. ESR affects the crystal's impedance and power consumption in the oscillator circuit. Identical ESR ensures equivalent electrical performance in this parameter.