CTS-Frequency Controls 416F440X2IAT 44 MHz Crystal Equivalent & Substitute Parts

Part Overview

The 416F440X2IAT is a 44 MHz fundamental mode crystal oscillator manufactured by CTS-Frequency Controls, designed for surface mount applications in 4-SMD, No Lead packaging. This part is discontinued at DiGi Electronics. Equivalent and substitute parts within the 416 series provide alternative options with matching or compatible electrical and mechanical specifications for continued system integration.

Key Parameters

Parameter	Value
Frequency	44 MHz
Frequency Tolerance	±15ppm
Load Capacitance	10pF
ESR (Equivalent Series Resistance)	60 Ohms
Operating Temperature Range	-40°C ~ 85°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 within the CTS-Frequency Controls 416 series is determined by the following critical parameters:

Frequency Match: All substitute parts operate at 44 MHz with ±15ppm frequency tolerance, ensuring direct functional equivalence in frequency-dependent circuits.

Load Capacitance Variation: Substitute parts are available with 8pF, 10pF, and 12pF load capacitance ratings. Load capacitance selection depends on the circuit design and oscillator tank circuit configuration. Parts with different load capacitance values (416F440X2IKR at 8pF and 416F440X2ILR at 12pF) are functionally equivalent when the circuit is designed for their respective load capacitance specifications.

Electrical Characteristics: All parts maintain 60 Ohms ESR, ±20ppm frequency stability, and fundamental operating mode, ensuring consistent electrical performance across the substitute group.

Mechanical Compatibility: All parts share identical 4-SMD, No Lead packaging, physical dimensions (0.063" L x 0.047" W), and maximum seated height (0.018"), enabling direct PCB footprint compatibility.

Compliance & Environmental: All parts are ROHS3 compliant, MSL 1 rated, and operate across the -40°C ~ 85°C temperature range.

Parameter Comparison

Part Number	Manufacturer	Frequency	Load Capacitance	ESR	Frequency Tolerance	Package	Product Status	Inventory
416F440X2IAT	CTS-Frequency Controls	44 MHz	10pF	60 Ohms	±15ppm	4-SMD, No Lead	Discontinued at DiGi Electronics	901 Pcs
416F440X2IKR	CTS-Frequency Controls	44 MHz	8pF	60 Ohms	±15ppm	4-SMD, No Lead	Active	813 Pcs
416F440X2ILR	CTS-Frequency Controls	44 MHz	12pF	60 Ohms	±15ppm	4-SMD, No Lead	Active	840 Pcs
416F440X2IAR	CTS-Frequency Controls	44 MHz	10pF	60 Ohms	±15ppm	4-SMD, No Lead	Active	708 Pcs

Engineering Selection Recommendations

Direct Parametric Equivalent: The 416F440X2IAR is the primary substitute for the 416F440X2IAT. Both parts specify 10pF load capacitance, 60 Ohms ESR, and ±15ppm frequency tolerance. The 416F440X2IAR is currently active in production and available in Tape & Reel packaging, making it the preferred replacement for discontinued 416F440X2IAT applications.

Load Capacitance Alternatives: The 416F440X2IKR (8pF) and 416F440X2ILR (12pF) are functionally equivalent alternatives when circuit design accommodates their respective load capacitance specifications. Selection between these variants depends on the oscillator tank circuit design and load capacitance requirements of the target application.

Compliance & Availability: All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing and environmental standards. All parts are currently in stock with active product status, except the original 416F440X2IAT which is discontinued.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 416F440X2IAT with 416F440X2IAR? A: Yes. Both parts specify identical load capacitance (10pF), ESR (60 Ohms), frequency tolerance (±15ppm), and physical dimensions. The 416F440X2IAR is the parametric equivalent and direct replacement.

Q: What is the difference between 416F440X2IKR, 416F440X2ILR, and 416F440X2IAR? A: The primary difference is load capacitance: 416F440X2IKR operates at 8pF, 416F440X2IAR at 10pF, and 416F440X2ILR at 12pF. Load capacitance selection depends on the oscillator circuit design. All other electrical parameters (frequency, ESR, tolerance) remain identical.

Q: Are these parts pin-compatible? A: Yes. All parts use 4-SMD, No Lead packaging with identical physical dimensions (0.063" L x 0.047" W) and maximum seated height (0.018"), ensuring direct PCB footprint compatibility.

Q: Does load capacitance affect circuit performance? A: Load capacitance is a design parameter that must match the oscillator tank circuit configuration. Selecting a part with incorrect load capacitance for your circuit design will result in frequency deviation. Verify your circuit's load capacitance specification before selecting a substitute.

Q: Are all substitute parts RoHS compliant? A: Yes. All parts listed are ROHS3 compliant with MSL 1 rating, suitable for lead-free soldering and modern manufacturing processes.

Q: What is the difference between packaging designations (IAT vs. IAR vs. IKR vs. ILR)? A: The suffix indicates packaging format and load capacitance variant. IAT and IAR both specify 10pF load capacitance; IKR specifies 8pF; ILR specifies 12pF. The original 416F440X2IAT uses standard packaging, while substitute parts use Tape & Reel (TR) packaging for automated assembly.

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