FK2500018 Equivalent & Substitute Parts

Part Overview

The FK2500018 is a 25 MHz XO (Standard) CMOS Oscillator manufactured by Diodes Incorporated, part of the SaRonix-eCera™ FK series. This surface mount crystal oscillator operates at 3.3V with Enable/Disable functionality and is housed in a 4-SMD, No Lead package. The part is currently Active in product status with 823 pieces in stock.

Equivalent and substitute parts are identified when designs require alternative sourcing due to inventory constraints, packaging format changes, or performance specification upgrades while maintaining electrical and mechanical compatibility within the same frequency and voltage class.

Key Parameters

Parameter	FK2500018 Specification
Frequency	25 MHz
Output Type	CMOS
Supply Voltage	3.3V
Function	Enable/Disable
Frequency Stability	±50ppm
Operating Temperature Range	-20°C ~ 70°C
Package / Case	4-SMD, No Lead
Size / Dimension	0.126" L x 0.098" W (3.20mm x 2.50mm)
Height - Seated (Max)	0.045" (1.15mm)
Current - Supply (Max)	10mA
Current - Supply (Disable) (Max)	10µA
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the FK2500018 are grouped based on the following critical parameters that determine functional and mechanical compatibility:

Core Compatibility Parameters:

Frequency: 25 MHz (all substitutes match)
Supply Voltage: 3.3V (all substitutes match)
Function: Enable/Disable (all substitutes match)
Package / Case: 4-SMD, No Lead (all substitutes match)
Physical Dimensions: 0.126" L x 0.098" W (3.20mm x 2.50mm) (all substitutes match)
Mounting Type: Surface Mount (all substitutes match)

Variable Parameters Affecting Substitution:

Output Type: CMOS or LVCMOS
Frequency Stability: ±50ppm or ±25ppm
Operating Temperature Range: -20°C ~ 70°C or -40°C ~ 85°C
Packaging Format: Bulk or Tape & Reel (TR)
Manufacturer: Diodes Incorporated or Suntsu Electronics, Inc.

Substitutes are classified as direct equivalents when output type and frequency stability match the main part, or as upgrades when offering improved frequency stability or extended temperature range while maintaining all core electrical and mechanical parameters.

Parameter Comparison

Part Number	Manufacturer	Output Type	Frequency Stability	Operating Temperature	Packaging	Current - Supply (Max)	Inventory	Product Status
FK2500018	Diodes Incorporated	CMOS	±50ppm	-20°C ~ 70°C	Bulk	10mA	823 Pcs	Active
FK2500019	Diodes Incorporated	CMOS	±25ppm	-20°C ~ 70°C	Bulk	10mA	1550 Pcs	Active
FK2500025	Diodes Incorporated	LVCMOS	±25ppm	-40°C ~ 85°C	Tape & Reel (TR)	10mA	2600 Pcs	Active
FK2500022	Diodes Incorporated	LVCMOS	±50ppm	-40°C ~ 85°C	Tape & Reel (TR)	10mA	4417 Pcs	Active
FKSSD1025	Diodes Incorporated	CMOS	±25ppm	-10°C ~ 70°C	Tape & Reel (TR)	10mA	6873 Pcs	Active
SXO32C3A271-25.000M	Suntsu Electronics, Inc.	CMOS	±50ppm	-20°C ~ 70°C	Bulk	10mA	18185 Pcs	Active

Engineering Selection Recommendations

Direct Equivalent (Same Specifications):

SXO32C3A271-25.000M (Suntsu Electronics, Inc.) provides identical electrical and mechanical specifications to FK2500018, with the same CMOS output, ±50ppm frequency stability, and -20°C ~ 70°C operating temperature range. Both are supplied in Bulk packaging and maintain full compliance with ROHS3 and EAR99 standards.

Upgrade Options (Improved Performance):

FK2500019 offers improved frequency stability (±25ppm vs. ±50ppm) while maintaining CMOS output and identical temperature range. Available in higher inventory (1550 Pcs).
FK2500025 and FK2500022 provide extended operating temperature range (-40°C ~ 85°C) with LVCMOS output and Tape & Reel packaging. FK2500025 includes ±25ppm stability; FK2500022 maintains ±50ppm stability.
FKSSD1025 offers ±25ppm frequency stability in Tape & Reel format with CMOS output, though operating temperature is limited to -10°C ~ 70°C.

All substitute parts maintain Active product status, ROHS3 compliance, and MSL 1 rating, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can FK2500019 replace FK2500018 directly? A: Yes. FK2500019 is a direct functional replacement with identical electrical and mechanical specifications, with the added benefit of improved frequency stability (±25ppm vs. ±50ppm). Both use CMOS output, 3.3V supply, and the same 4-SMD, No Lead package.

Q: What is the difference between CMOS and LVCMOS output types? A: Both output types are compatible with 3.3V systems. LVCMOS (Low Voltage CMOS) is optimized for lower voltage signaling and may offer improved noise characteristics in certain applications. FK2500025 and FK2500022 use LVCMOS output, while FK2500018, FK2500019, FKSSD1025, and SXO32C3A271-25.000M use standard CMOS output.

Q: Does packaging format affect electrical performance? A: No. Bulk and Tape & Reel (TR) packaging formats contain identical components and deliver the same electrical performance. The difference is in handling and assembly convenience. Tape & Reel is standard for automated pick-and-place assembly.

Q: Can I use FK2500025 in applications requiring -20°C operation? A: No. FK2500025 operates from -40°C ~ 85°C, which exceeds the lower temperature requirement of -20°C. However, if your application requires operation below -10°C, FK2500025 is suitable, while FKSSD1025 is not (limited to -10°C ~ 70°C).

Q: Is SXO32C3A271-25.000M from a different manufacturer compatible? A: Yes. SXO32C3A271-25.000M from Suntsu Electronics, Inc. is electrically and mechanically identical to FK2500018. Both are ROHS3 compliant, Active products with identical frequency, voltage, output type, and package specifications.

Q: Which substitute offers the best frequency stability? A: FK2500019 and FK2500025 both offer ±25ppm frequency stability, compared to ±50ppm for FK2500018. Selection between these depends on your operating temperature requirements: FK2500019 for -20°C ~ 70°C, or FK2500025 for -40°C ~ 85°C.

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