FRETHE025 VCXO Oscillator: Equivalent & Substitute Parts

Part Overview

The FRETHE025 is a 25 MHz VCXO (Voltage Controlled Crystal Oscillator) manufactured by Diodes Incorporated, designed for applications requiring frequency tuning capability with CMOS output. This Surface Mount Device (SMD) operates at 3.3V with Enable/Disable functionality in a compact 6-SMD, No Lead package. The part is Active status and ROHS3 compliant, making it suitable for modern electronic designs requiring environmental compliance.

Substitute parts become necessary when the primary manufacturer's stock is unavailable, when alternative sourcing reduces lead times, or when design flexibility permits selection from qualified alternatives meeting identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Frequency	25 MHz
Oscillator Type	VCXO
Output Type	CMOS
Supply Voltage	3.3V
Frequency Stability	±25ppm
Operating Temperature Range	-20°C to 70°C
Package Type	6-SMD, No Lead
Mounting Type	Surface Mount
Physical Dimensions	7.00mm L × 5.00mm W
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the FRETHE025 is determined by strict equivalence across the following critical parameters:

Frequency: 25 MHz (exact match required)
Oscillator Type: VCXO (voltage-controlled capability mandatory)
Output Configuration: CMOS (logic level compatibility)
Supply Voltage: 3.3V (power supply compatibility)
Frequency Stability: ±25ppm (baseline frequency accuracy)
Operating Temperature: -20°C to 70°C (thermal operating window)
Package/Case: 6-SMD, No Lead (PCB footprint compatibility)
Mounting Type: Surface Mount (assembly process compatibility)
Physical Dimensions: 7.00mm × 5.00mm (board layout fit)
Compliance: ROHS3 Compliant (regulatory requirement)

All three substitute parts—SVC75C3C27A2-25.000M, SVC75C3C27B2-25.000M, and SVC75C3C27C2-25.000M—manufactured by Suntsu Electronics, Inc., meet these core substitution criteria. Variations exist only in Absolute Pull Range (APR) and maximum supply current, which do not disqualify substitution when the application requirements fall within the specified ranges.

Parameter Comparison

Parameter	FRETHE025 (Diodes)	SVC75C3C27A2-25.000M (Suntsu)	SVC75C3C27B2-25.000M (Suntsu)	SVC75C3C27C2-25.000M (Suntsu)
Manufacturer	Diodes Incorporated	Suntsu Electronics, Inc.	Suntsu Electronics, Inc.	Suntsu Electronics, Inc.
Frequency	25 MHz	25 MHz	25 MHz	25 MHz
Type	VCXO	VCXO	VCXO	VCXO
Output	CMOS	CMOS	CMOS	CMOS
Supply Voltage	3.3V	3.3V	3.3V	3.3V
Frequency Stability	±25ppm	±25ppm	±25ppm	±25ppm
Absolute Pull Range (APR)	±100ppm	±150ppm	±100ppm	±50ppm
Operating Temperature	-20°C to 70°C	-20°C to 70°C	-20°C to 70°C	-20°C to 70°C
Current - Supply (Max)	10mA	25mA	25mA	25mA
Package / Case	6-SMD, No Lead	6-SMD, No Lead	6-SMD, No Lead	6-SMD, No Lead
Size / Dimension	7.00mm × 5.00mm	7.00mm × 5.00mm	7.00mm × 5.00mm	7.00mm × 5.00mm
Height - Seated (Max)	1.55mm	1.70mm	1.70mm	1.70mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
ECCN	EAR99	EAR99	EAR99	EAR99

Engineering Selection Recommendations

All three Suntsu substitute parts maintain Active product status and ROHS3 compliance, meeting regulatory and environmental requirements equivalent to the FRETHE025. Selection among the three Suntsu alternatives depends on application-specific pull range requirements:

SVC75C3C27C2-25.000M: Narrowest APR (±50ppm) for applications requiring minimal frequency deviation and tightest tuning control.
SVC75C3C27B2-25.000M: Matched APR (±100ppm) to the FRETHE025, providing direct functional equivalence for existing designs.
SVC75C3C27A2-25.000M: Widest APR (±150ppm) for applications requiring maximum frequency tuning range.

All substitute parts operate within the specified temperature range and maintain CMOS output compatibility. Maximum supply current increases to 25mA across all Suntsu alternatives compared to the FRETHE025's 10mA specification; designs must confirm power supply capacity accommodates this increase. Physical height increases from 1.55mm to 1.70mm; PCB clearance must be verified for space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can SVC75C3C27A2-25.000M, SVC75C3C27B2-25.000M, or SVC75C3C27C2-25.000M be used as direct replacements for FRETHE025?

A: Yes, all three Suntsu parts are direct substitutes for the FRETHE025 in applications where the increased maximum supply current (25mA vs. 10mA) and increased seated height (1.70mm vs. 1.55mm) are acceptable. Electrical functionality, frequency, output type, and operating temperature range are identical.

Q: What is the difference between the three Suntsu substitute parts?

A: The three parts differ only in Absolute Pull Range (APR): SVC75C3C27C2-25.000M offers ±50ppm, SVC75C3C27B2-25.000M offers ±100ppm (matching FRETHE025), and SVC75C3C27A2-25.000M offers ±150ppm. APR determines the frequency tuning range available through the control voltage input.

Q: Are there any package or footprint differences between FRETHE025 and the Suntsu substitutes?

A: Both the main part and all substitutes use identical 6-SMD, No Lead packages with 7.00mm × 5.00mm footprints. The seated height increases from 1.55mm to 1.70mm on Suntsu parts; verify PCB clearance for components or shields above the oscillator.

Q: Do all parts meet RoHS and export compliance requirements?

A: Yes. FRETHE025 and all three Suntsu substitutes are ROHS3 compliant and classified as EAR99 for export control purposes.

Q: Which substitute part should I select if my design requires the tightest frequency tuning control?

A: SVC75C3C27C2-25.000M with ±50ppm APR provides the narrowest tuning range, suitable for applications requiring minimal frequency deviation. If your design requires the tuning range of the original FRETHE025, select SVC75C3C27B2-25.000M with ±100ppm APR.

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