FL2500284 25 MHz Crystal Equivalent & Substitute Parts

Part Overview

The FL2500284 is a 25 MHz fundamental mode crystal manufactured by Diodes Incorporated in the SaRonix-eCera™ FL series. This surface mount device is specified for 18pF load capacitance with 30 Ohms equivalent series resistance (ESR) in a 4-SMD, No Lead package. The part is active and in production with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when frequency, stability, load capacitance, operating temperature range, package type, and compliance certifications remain equivalent or compatible within specified tolerances.

Key Parameters

Parameter	FL2500284 Specification
Frequency	25 MHz
Frequency Stability	±30ppm
Load Capacitance	18pF
ESR (Equivalent Series Resistance)	30 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-20°C to 70°C
Package / Case	4-SMD, No Lead
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Primary Matching Criteria:

Frequency: 25 MHz (exact match required)
Frequency Stability: ±30ppm (exact match required)
Operating Temperature Range: -20°C to 70°C (exact match required)
Package / Case: 4-SMD, No Lead (exact match required)
Operating Mode: Fundamental (exact match required)

Secondary Compatibility Parameters:

Load Capacitance: 18pF or 20pF (within acceptable circuit design tolerance)
ESR: 30 Ohms to 150 Ohms (acceptable range for 25 MHz crystals)
Mounting Type: Surface Mount (exact match required)
RoHS Status: ROHS3 or RoHS Compliant (acceptable)
MSL: 1 (Unlimited) (exact match required)

Substitute parts are grouped into two categories based on load capacitance compatibility:

Category A - 18pF Load Capacitance (Direct Electrical Equivalents): 7R-25.000MAAJ-T, 8Y-25.000MAAJ-T, 8Z-25.000MAAJ-T, C3E-25.000-18-3030-R

Category B - 20pF Load Capacitance (Circuit Design Dependent): FL2500137Z, FL2500283Z

Parameter Comparison

Parameter	FL2500284	FL2500137Z	FL2500283Z	7R-25.000MAAJ-T	8Y-25.000MAAJ-T	8Z-25.000MAAJ-T	C3E-25.000-18-3030-R
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	TXC CORPORATION	TXC CORPORATION	TXC CORPORATION	Aker Technology Corp
Frequency	25 MHz	25 MHz	25 MHz	25 MHz	25 MHz	25 MHz	25 MHz
Frequency Stability	±30ppm	±30ppm	±30ppm	±30ppm	±30ppm	±30ppm	±30ppm
Load Capacitance	18pF	20pF	20pF	18pF	18pF	18pF	18pF
ESR (Ohms)	30	50	50	150	100	100	100
Operating Temperature	-20°C to 70°C	-20°C to 70°C	-20°C to 70°C	-20°C to 70°C	-20°C to 70°C	-20°C to 70°C	-20°C to 70°C
Package / Case	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Size (mm)	3.20 x 2.50	3.20 x 2.50	3.20 x 2.50	2.05 x 1.65	2.00 x 1.60	2.50 x 2.00	3.20 x 2.50
Height - Seated Max (mm)	0.78	0.75	0.75	0.60	0.55	0.55	0.75
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Substitutes (18pF Load Capacitance):

7R-25.000MAAJ-T, 8Y-25.000MAAJ-T, 8Z-25.000MAAJ-T, and C3E-25.000-18-3030-R are electrically equivalent to FL2500284 with matching 18pF load capacitance. All parts maintain identical frequency, stability, operating temperature range, and package specifications. These substitutes are suitable for direct replacement in applications where the original part is unavailable. ESR variations (100-150 Ohms versus 30 Ohms) are within acceptable operating ranges for 25 MHz fundamental mode crystals. All substitute parts carry active product status and appropriate RoHS compliance certifications.

Alternative Substitutes (20pF Load Capacitance):

FL2500137Z and FL2500283Z are manufactured by Diodes Incorporated with 20pF load capacitance instead of 18pF. These parts maintain all other critical parameters including frequency, stability, temperature range, and package type. The 20pF load capacitance difference requires circuit design verification to confirm compatibility with the oscillator circuit's load capacitance specification. Both parts are active products with ROHS3 compliance and higher inventory availability (2813 and 11851 units respectively).

Compact Package Alternatives:

7R-25.000MAAJ-T, 8Y-25.000MAAJ-T, and 8Z-25.000MAAJ-T offer reduced physical dimensions (2.05 x 1.65 mm to 2.50 x 2.00 mm) compared to FL2500284 (3.20 x 2.50 mm) with lower seated heights (0.55-0.60 mm versus 0.78 mm). These alternatives are suitable for space-constrained applications while maintaining electrical equivalence.

Frequently Asked Questions (FAQ)

Q: Can FL2500137Z or FL2500283Z be used as direct replacements for FL2500284?

A: FL2500137Z and FL2500283Z share identical frequency (25 MHz), stability (±30ppm), operating temperature range (-20°C to 70°C), package type (4-SMD, No Lead), and compliance certifications. The primary difference is load capacitance: 20pF versus 18pF. Direct substitution requires verification that the oscillator circuit is designed to operate with 20pF load capacitance. If the circuit specifies 18pF load capacitance, use 7R-25.000MAAJ-T, 8Y-25.000MAAJ-T, 8Z-25.000MAAJ-T, or C3E-25.000-18-3030-R instead.

Q: What is the significance of ESR differences among substitute parts?

A: ESR (Equivalent Series Resistance) values range from 30 Ohms (FL2500284) to 150 Ohms (7R-25.000MAAJ-T) across the substitute list. All values are within acceptable operating ranges for 25 MHz fundamental mode crystals. ESR affects oscillator startup time and power consumption but does not prevent functional operation. Circuit design verification is recommended if ESR exceeds 100 Ohms in power-sensitive applications.

Q: Are the compact package alternatives (7R, 8Y, 8Z series) mechanically compatible with FL2500284 footprints?

A: No. The 7R-25.000MAAJ-T (2.05 x 1.65 mm), 8Y-25.000MAAJ-T (2.00 x 1.60 mm), and 8Z-25.000MAAJ-T (2.50 x 2.00 mm) have different physical dimensions than FL2500284 (3.20 x 2.50 mm). These parts require PCB footprint redesign and are suitable only for new designs or boards with flexible layout requirements. For mechanical compatibility with existing FL2500284 footprints, use FL2500137Z, FL2500283Z, or C3E-25.000-18-3030-R.

Q: Do all substitute parts meet the same compliance requirements as FL2500284?

A: All substitute parts carry RoHS compliance certifications (ROHS3 or RoHS Compliant) and MSL 1 (Unlimited) ratings matching FL2500284. All parts are active products in production. REACH and ECCN classifications are consistent across the substitute list. No compliance barriers exist for substitution.

Q: Which substitute part offers the best inventory availability?

A: FL2500283Z offers the highest inventory availability with 11,851 units in stock, followed by 8Z-25.000MAAJ-T with 12,229 units. Both parts meet electrical and compliance requirements. FL2500283Z is recommended for high-volume procurement due to superior stock levels and Diodes Incorporated manufacturing consistency with the original FL2500284.

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