CTS-Frequency Controls 416F27135AST 27.12 MHz Crystal Equivalent & Substitute Parts

Part Overview

The CTS-Frequency Controls 416F27135AST is a 27.12 MHz fundamental mode crystal oscillator in a 4-SMD, no-lead surface mount 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 applications requiring precise frequency control with tight tolerance specifications and low equivalent series resistance.

Key Parameters

Parameter	Value
Frequency	27.12 MHz
Frequency Tolerance	±30 ppm
Frequency Stability	±50 ppm
ESR (Equivalent Series Resistance)	120 Ohms
Operating Mode	Fundamental
Load Capacitance	Series
Operating Temperature Range	-10°C to 60°C
Package / Case	4-SMD, No Lead
Size / Dimension	0.063" L x 0.047" W (1.60 mm x 1.20 mm)
Height - Seated (Max)	0.018" (0.45 mm)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 416F27135AST are qualified based on the following critical parameters:

Frequency: 27.12 MHz (exact match required)
Frequency Tolerance: ±30 ppm (exact match required)
ESR: 120 Ohms (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)
Operating Mode: Fundamental (exact match required)
Load Capacitance: Series (exact match required)

The 416F27135ASR and 416F27133ASR meet all critical substitution criteria. The primary distinction between substitute parts is product status and packaging format, with both alternatives available in active production status.

Parameter Comparison

Parameter	416F27135AST (Main Part)	416F27135ASR (Substitute)	416F27133ASR (Substitute)
Manufacturer	CTS-Frequency Controls	CTS-Frequency Controls	CTS-Frequency Controls
Frequency	27.12 MHz	27.12 MHz	27.12 MHz
Frequency Tolerance	±30 ppm	±30 ppm	±30 ppm
Frequency Stability	±50 ppm	±50 ppm	±30 ppm
ESR	120 Ohms	120 Ohms	120 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental
Load Capacitance	Series	Series	Series
Operating Temperature	-10°C to 60°C	-10°C to 60°C	-10°C to 60°C
Package / Case	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Size / Dimension	0.063" L x 0.047" W (1.60 mm x 1.20 mm)	0.063" L x 0.047" W (1.60 mm x 1.20 mm)	0.063" L x 0.047" W (1.60 mm x 1.20 mm)
Height - Seated (Max)	0.018" (0.45 mm)	0.018" (0.45 mm)	0.018" (0.45 mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Discontinued at DiGi Electronics	Active	Active
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both 416F27135ASR and 416F27133ASR are direct functional equivalents to the discontinued 416F27135AST. Selection between these substitutes should be based on the following factors:

416F27135ASR: Maintains identical frequency stability specification (±50 ppm) to the original part. This substitute is recommended for applications where the original design parameters must be preserved without modification. Active product status ensures long-term availability.

416F27133ASR: Offers improved frequency stability specification (±30 ppm) compared to the original part. This substitute provides enhanced performance margin and is suitable for applications where tighter frequency stability is beneficial or required. Active product status ensures long-term availability.

Both substitutes are supplied in Tape & Reel packaging format, which is standard for production volume applications. Both parts maintain full ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can 416F27135ASR and 416F27133ASR be used interchangeably with 416F27135AST?

A: Both parts meet all critical electrical and mechanical parameters required for direct substitution. The primary difference is frequency stability specification: 416F27135ASR matches the original ±50 ppm specification, while 416F27133ASR provides ±30 ppm. Selection depends on application requirements.

Q: What is the difference between the packaging formats?

A: The original 416F27135AST is supplied in bulk packaging. Both substitute parts (416F27135ASR and 416F27133ASR) are supplied in Tape & Reel format, which is standard for automated assembly processes and production volumes.

Q: Are there any compliance or certification differences between these parts?

A: All three parts maintain identical RoHS3 compliance and MSL 1 rating. No compliance or certification differences exist between the main part and substitute parts.

Q: What determines whether a crystal can substitute for the 416F27135AST?

A: Substitution requires exact matching of frequency (27.12 MHz), frequency tolerance (±30 ppm), ESR (120 Ohms), package type (4-SMD, No Lead), physical dimensions (0.063" L x 0.047" W, 0.018" max height), operating temperature range (-10°C to 60°C), operating mode (Fundamental), and load capacitance (Series).

Q: Is the improved frequency stability of 416F27133ASR a concern for existing designs?

A: No. Improved frequency stability is a performance enhancement that does not create compatibility issues. Existing designs specified for ±50 ppm tolerance will operate within specification with the ±30 ppm part.

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