FDC500018 Equivalent & Substitute Parts

Part Overview

The FDC500018 is a 125 MHz XO (Standard) CMOS oscillator manufactured by Diodes Incorporated, part of the SaRonix-eCera™ FD series. This surface mount crystal oscillator provides a 3.3V enable/disable function in a compact 4-SMD, No Lead package. The device is actively produced and ROHS3 compliant, making it suitable for applications requiring stable frequency generation with low power consumption in disabled mode.

Substitute parts are identified based on matching core electrical and mechanical specifications: 125 MHz frequency, CMOS output, 3.3V supply voltage, enable/disable function, 4-SMD No Lead package, and compatible physical dimensions.

Key Parameters

Parameter	Value
Frequency	125 MHz
Output Type	CMOS
Supply Voltage	3.3V
Function	Enable/Disable
Package Type	4-SMD, No Lead
Physical Dimensions	5.00mm L x 3.20mm W
Mounting Type	Surface Mount
Product Status	Active
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the FDC500018 are qualified based on the following criteria:

Mandatory Matching Parameters:

Frequency: 125 MHz
Output: CMOS
Supply Voltage: 3.3V
Function: Enable/Disable
Package: 4-SMD, No Lead
Physical Dimensions: 5.00mm x 3.20mm (length x width)
Mounting: Surface Mount
Base Resonator: Crystal

Allowable Variations:

Frequency Stability: ±25ppm to ±50ppm
Operating Temperature Range: -20°C ~ 70°C to -40°C ~ 85°C
Current Supply (Max): 45mA to 50mA
Height (Seated Max): 1.30mm to 1.40mm
Packaging Format: Bulk or standard

The identified substitutes maintain electrical and mechanical compatibility while allowing for extended operating temperature ranges and relaxed frequency stability specifications where applicable.

Parameter Comparison

Parameter	FDC500018	FDC500020	SXO53C3C271-125.000M
Manufacturer	Diodes Incorporated	Diodes Incorporated	Suntsu Electronics, Inc.
Frequency	125 MHz	125 MHz	125 MHz
Output Type	CMOS	CMOS	CMOS
Supply Voltage	3.3V	3.3V	3.3V
Function	Enable/Disable	Enable/Disable	Enable/Disable
Package / Case	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Size / Dimension	5.00mm x 3.20mm	5.00mm x 3.20mm	5.00mm x 3.20mm
Height - Seated (Max)	1.30mm	1.30mm	1.40mm
Frequency Stability	±25ppm	±50ppm	±25ppm
Operating Temperature	-20°C ~ 70°C	-40°C ~ 85°C	-20°C ~ 70°C
Current - Supply (Max)	45mA	45mA	50mA
Current - Supply (Disable) (Max)	10µA	10µA	Not specified
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts are actively produced and ROHS3 compliant, meeting regulatory requirements for current applications.

FDC500018 (Primary): Maintains ±25ppm frequency stability and operates within -20°C ~ 70°C. Select when the narrower frequency tolerance and standard temperature range are required.

FDC500020 (Diodes Incorporated Alternative): Offers extended operating temperature range (-40°C ~ 85°C) with relaxed frequency stability (±50ppm). Select when wider temperature operation is necessary and ±50ppm stability is acceptable.

SXO53C3C271-125.000M (Suntsu Electronics Alternative): Provides ±25ppm frequency stability matching the primary part, with maximum supply current of 50mA. Select when cross-manufacturer sourcing is required while maintaining tight frequency tolerance.

All parts share identical package dimensions, mounting type, and core electrical specifications, ensuring PCB-level compatibility.

Frequently Asked Questions (FAQ)

Q: Can FDC500020 replace FDC500018 in all applications?

A: FDC500020 is mechanically and electrically compatible. The primary differences are extended operating temperature range (-40°C ~ 85°C versus -20°C ~ 70°C) and relaxed frequency stability (±50ppm versus ±25ppm). Substitution is valid when the application does not require the tighter frequency tolerance or narrower temperature range of the FDC500018.

Q: What are the physical compatibility considerations?

A: All three parts use identical 5.00mm x 3.20mm footprints and 4-SMD, No Lead packages. Height variation is minimal (1.30mm to 1.40mm), presenting no PCB assembly constraints.

Q: Does the SXO53C3C271-125.000M require different PCB layout?

A: No. The Suntsu part maintains the same package type, dimensions, and pin configuration as the Diodes Incorporated parts, requiring no PCB redesign.

Q: How do frequency stability specifications affect circuit performance?

A: Frequency stability determines long-term frequency accuracy. The ±25ppm specification (FDC500018 and SXO53C3C271-125.000M) provides tighter tolerance than ±50ppm (FDC500020). Select based on application frequency accuracy requirements.

Q: Are all parts suitable for industrial temperature applications?

A: FDC500020 supports -40°C ~ 85°C, suitable for industrial and extended temperature applications. FDC500018 and SXO53C3C271-125.000M are rated -20°C ~ 70°C, appropriate for commercial temperature ranges.

Q: What is the supply current difference between parts?

A: FDC500018 and FDC500020 specify 45mA maximum supply current. SXO53C3C271-125.000M specifies 50mA. All parts maintain 10µA disable current (FDC500018 and FDC500020), enabling low-power standby operation.

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