FL2500137Z 25 MHz Crystal Equivalent & Substitute Parts

Part Overview

The FL2500137Z is a 25 MHz fundamental mode crystal manufactured by Diodes Incorporated in the SaRonix-eCera™ FL series. This surface mount crystal is specified for 20pF load capacitance with 50 Ohms equivalent series resistance and operates across -20°C to 70°C. The part is ROHS3 compliant and carries active product status. Substitute parts are identified when frequency, stability, load capacitance, operating mode, temperature range, mounting type, and package form factor align with the original specification.

Key Parameters

Parameter	Value
Frequency	25 MHz
Frequency Stability	±30ppm
Load Capacitance	20pF
ESR (Equivalent Series Resistance)	50 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-20°C to 70°C
Mounting Type	Surface Mount
Package / Case	4-SMD, No Lead
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the FL2500137Z is determined by matching the following critical parameters: frequency (25 MHz), frequency stability (±30ppm), operating mode (fundamental), operating temperature range (-20°C to 70°C), mounting type (surface mount), and package form factor (4-SMD, No Lead). Load capacitance and ESR values are secondary parameters that may vary within acceptable design tolerances depending on circuit requirements.

The substitute parts are grouped into two categories:

Parametric Equivalent: FL2500283Z from Diodes Incorporated maintains identical specifications including 20pF load capacitance and 50 Ohms ESR.

Manufacturer Recommended Alternatives: Parts from TXC CORPORATION (7R-25.000MAAJ-T, 8Y-25.000MAAJ-T, 8Z-25.000MAAJ-T) and Aker Technology Corp (C3E-25.000-18-3030-R) share the core frequency, stability, operating mode, and temperature range but specify 18pF load capacitance and 100-150 Ohms ESR. These alternatives are suitable when circuit design accommodates the load capacitance and ESR variations.

Parameter Comparison

Part Number	Manufacturer	Frequency	Frequency Stability	Load Capacitance	ESR	Package	Size (mm)	Height (mm)	RoHS Status	Inventory
FL2500137Z	Diodes Incorporated	25 MHz	±30ppm	20pF	50 Ohms	4-SMD, No Lead	3.20 x 2.50	0.75	ROHS3	2813
FL2500283Z	Diodes Incorporated	25 MHz	±30ppm	20pF	50 Ohms	4-SMD, No Lead	3.20 x 2.50	0.75	ROHS3	11851
7R-25.000MAAJ-T	TXC CORPORATION	25 MHz	±30ppm	18pF	150 Ohms	4-SMD, No Lead	2.05 x 1.65	0.60	ROHS3	1081
8Y-25.000MAAJ-T	TXC CORPORATION	25 MHz	±30ppm	18pF	100 Ohms	4-SMD, No Lead	2.00 x 1.60	0.55	RoHS	10011
8Z-25.000MAAJ-T	TXC CORPORATION	25 MHz	±30ppm	18pF	100 Ohms	4-SMD, No Lead	2.50 x 2.00	0.55	RoHS	12229
C3E-25.000-18-3030-R	Aker Technology Corp	25 MHz	±30ppm	18pF	100 Ohms	4-SMD, No Lead	3.20 x 2.50	0.75	ROHS3	5379

Engineering Selection Recommendations

FL2500283Z is the direct parametric equivalent to FL2500137Z, offering identical electrical specifications and compliance status with higher inventory availability (11851 units versus 2813 units). Both parts carry ROHS3 compliance and are manufactured by Diodes Incorporated within the same product series.

TXC CORPORATION parts (7R-25.000MAAJ-T, 8Y-25.000MAAJ-T, 8Z-25.000MAAJ-T) and the Aker Technology Corp part (C3E-25.000-18-3030-R) are suitable alternatives when load capacitance tolerance of 18pF and ESR variation to 100-150 Ohms are acceptable within circuit design parameters. All substitute parts maintain the 25 MHz frequency, ±30ppm stability, fundamental operating mode, and -20°C to 70°C temperature range. The TXC 8Y and 8Z variants offer reduced package dimensions and lower ESR (100 Ohms) compared to the 7R variant (150 Ohms). The Aker C3E part maintains the original package footprint (3.20 x 2.50 mm) while specifying 18pF load capacitance and 100 Ohms ESR.

Frequently Asked Questions (FAQ)

Q: Can FL2500283Z be used as a direct replacement for FL2500137Z?

A: Yes. FL2500283Z is a parametric equivalent with identical frequency, stability, load capacitance, ESR, operating temperature range, and package specifications. Both parts are ROHS3 compliant and manufactured by Diodes Incorporated.

Q: What is the difference between the Diodes Incorporated parts and TXC CORPORATION parts?

A: The primary differences are load capacitance (20pF versus 18pF) and ESR (50 Ohms versus 100-150 Ohms). The TXC parts also feature smaller package dimensions. Substitution is valid when circuit design accommodates these parameter variations.

Q: Are the TXC 8Y and 8Z parts interchangeable with each other?

A: Both 8Y-25.000MAAJ-T and 8Z-25.000MAAJ-T share identical electrical specifications (25 MHz, ±30ppm, 18pF, 100 Ohms ESR). The difference is package size: 8Y measures 2.00 x 1.60 mm with 0.55 mm height, while 8Z measures 2.50 x 2.00 mm with 0.55 mm height. Selection depends on available PCB footprint space.

Q: Does the C3E-25.000-18-3030-R maintain the same footprint as the original FL2500137Z?

A: Yes. The C3E part specifies 3.20 x 2.50 mm dimensions and 0.75 mm height, matching the FL2500137Z footprint. The electrical difference is 18pF load capacitance and 100 Ohms ESR instead of 20pF and 50 Ohms.

Q: What compliance certifications apply to all substitute parts?

A: All parts carry RoHS compliance (ROHS3 or RoHS). All parts are MSL 1 (Unlimited moisture sensitivity level). All parts are classified as EAR99 for export control purposes.

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