CTS-Frequency Controls 416F48035AST Crystal Equivalent & Substitute Parts

Part Overview

The CTS-Frequency Controls 416F48035AST is a 48 MHz surface mount crystal oscillator in a 4-SMD, No Lead package. This part is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications. The 416 series crystals are designed for fundamental mode operation with 60 Ohms equivalent series resistance and are suitable for embedded systems, communication equipment, and timing-critical applications requiring stable frequency reference.

Key Parameters

Parameter	Value
Frequency	48 MHz
Frequency Tolerance	±30 ppm
ESR (Equivalent Series Resistance)	60 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-10°C to 60°C
Mounting Type	Surface Mount
Package / Case	4-SMD, No Lead
Size / Dimension	0.063" L x 0.047" W (1.60mm x 1.20mm)
Height - Seated (Max)	0.018" (0.45mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 416F48035AST is determined by strict equivalence across the following critical parameters:

Frequency: 48 MHz (exact match required)
Frequency Tolerance: ±30 ppm (exact match required)
ESR: 60 Ohms (exact match required)
Operating Mode: Fundamental (exact match required)
Package / Case: 4-SMD, No Lead (exact match required)
Physical Dimensions: 0.063" L x 0.047" W, 0.018" max height (exact match required)
Operating Temperature Range: -10°C to 60°C (exact match required)

The substitute parts listed below meet all these criteria and are therefore electrically and mechanically interchangeable with the main part number.

Parameter Comparison

Parameter	416F48035AST (Main)	416F48035ASR	416F48033ASR
Manufacturer	CTS-Frequency Controls	CTS-Frequency Controls	CTS-Frequency Controls
Frequency	48 MHz	48 MHz	48 MHz
Frequency Tolerance	±30 ppm	±30 ppm	±30 ppm
Frequency Stability	±50 ppm	±50 ppm	±30 ppm
ESR	60 Ohms	60 Ohms	60 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental
Operating Temperature	-10°C to 60°C	-10°C to 60°C	-10°C to 60°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Size / Dimension	0.063" L x 0.047" W (1.60mm x 1.20mm)	0.063" L x 0.047" W (1.60mm x 1.20mm)	0.063" L x 0.047" W (1.60mm x 1.20mm)
Height - Seated (Max)	0.018" (0.45mm)	0.018" (0.45mm)	0.018" (0.45mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics	Active	Active
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Both 416F48035ASR and 416F48033ASR are active product alternatives to the discontinued 416F48035AST. Selection between these substitutes should be based on the following factors:

416F48035ASR: Maintains identical frequency stability specification (±50 ppm) to the original part. This substitute is recommended for applications where the original design specifications must be preserved without modification.

416F48033ASR: Offers improved frequency stability at ±30 ppm, which is tighter than the original part's ±50 ppm specification. This substitute is suitable for applications that can benefit from enhanced frequency accuracy or where tighter stability margins are required.

Both substitutes are ROHS3 compliant, carry MSL 1 rating, and are available in Tape & Reel packaging for production environments. The physical footprint and electrical characteristics are identical across all three part numbers, ensuring direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can 416F48035ASR and 416F48033ASR be used interchangeably with 416F48035AST?

A: Yes. Both substitute parts meet all critical electrical and mechanical parameters required for direct substitution. The primary difference is frequency stability specification, with 416F48033ASR offering tighter tolerance.

Q: What is the difference between the main part and the substitutes?

A: The 416F48035AST is discontinued. The 416F48035ASR is an active equivalent with identical specifications. The 416F48033ASR is also active but features improved frequency stability (±30 ppm vs. ±50 ppm).

Q: Are there packaging differences between these parts?

A: Yes. The 416F48035AST is supplied in bulk packaging, while both 416F48035ASR and 416F48033ASR are supplied in Tape & Reel (TR) format, which is standard for production assembly.

Q: Do these crystals require any circuit modifications for substitution?

A: No. All three parts share identical frequency, ESR, operating temperature range, and physical dimensions. Direct substitution on the PCB is possible without circuit redesign.

Q: What is the significance of the frequency stability specification difference?

A: Frequency stability (±50 ppm vs. ±30 ppm) indicates the maximum frequency deviation over the operating temperature range. The 416F48033ASR provides tighter stability, which may be beneficial for timing-sensitive applications but is not required for basic compatibility.

Q: Are all parts RoHS compliant?

A: Yes. All three part numbers are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating.

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