416F400X2IST 40 MHz Crystal Equivalent & Substitute Parts

Part Overview

The 416F400X2IST is a 40 MHz fundamental mode crystal oscillator in a 4-SMD surface mount package manufactured by CTS-Frequency Controls. This component is designed for applications requiring precise frequency generation with tight tolerance specifications. The part is currently discontinued at DiGi Electronics, making identification of equivalent substitutes essential for ongoing production and maintenance applications. Equivalent parts maintain identical electrical and mechanical specifications while offering continued availability through active product lines.

Key Parameters

Parameter	Specification
Frequency	40 MHz
Frequency Tolerance	±15 ppm
Frequency Stability	±20 ppm
ESR (Equivalent Series Resistance)	60 Ohms
Load Capacitance	Series
Operating Mode	Fundamental
Operating Temperature Range	-40°C to 85°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

Substitution of the 416F400X2IST is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part 416F400X2ISR maintains identical specifications in the following key areas:

Frequency: 40 MHz (exact match)
Frequency Tolerance: ±15 ppm (exact match)
Frequency Stability: ±20 ppm (exact match)
ESR: 60 Ohms (exact match)
Load Capacitance: Series (exact match)
Operating Mode: Fundamental (exact match)
Operating Temperature Range: -40°C to 85°C (exact match)
Package / Case: 4-SMD, No Lead (exact match)
Physical Dimensions: 0.063" L x 0.047" W, 0.018" max height (exact match)
RoHS and REACH Compliance: ROHS3 Compliant, REACH Unaffected (exact match)

The primary difference between these parts is packaging format and product status. The 416F400X2ISR is supplied in Tape & Reel (TR) format and maintains active product status, whereas the 416F400X2IST is discontinued.

Parameter Comparison

Parameter	416F400X2IST (Main Part)	416F400X2ISR (Substitute)
Manufacturer	CTS-Frequency Controls	CTS-Frequency Controls
Frequency	40 MHz	40 MHz
Frequency Tolerance	±15 ppm	±15 ppm
Frequency Stability	±20 ppm	±20 ppm
ESR	60 Ohms	60 Ohms
Load Capacitance	Series	Series
Operating Mode	Fundamental	Fundamental
Operating Temperature	-40°C to 85°C	-40°C to 85°C
Package / Case	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)
Height - Seated (Max)	0.018" (0.45 mm)	0.018" (0.45 mm)
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics	Active
Packaging Format	Standard	Tape & Reel (TR)

Engineering Selection Recommendations

The 416F400X2ISR is a direct electrical and mechanical equivalent to the 416F400X2IST. Both parts are manufactured by CTS-Frequency Controls and share identical specifications across all critical parameters including frequency, tolerance, stability, impedance, temperature range, and physical dimensions. The 416F400X2ISR maintains active product status and ROHS3 compliance, making it suitable for new designs and production continuity where the original 416F400X2IST is no longer available. The Tape & Reel packaging of the 416F400X2ISR is standard for high-volume manufacturing environments and is compatible with automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 416F400X2ISR be used as a direct replacement for the 416F400X2IST?

A: Yes. Both parts are electrically and mechanically identical. They share the same frequency (40 MHz), tolerance (±15 ppm), stability (±20 ppm), ESR (60 Ohms), operating temperature range (-40°C to 85°C), and physical dimensions (0.063" L x 0.047" W, 0.018" max height). The primary difference is packaging format and product availability status.

Q: What is the difference between the two part numbers?

A: The 416F400X2IST is supplied in standard packaging and is discontinued. The 416F400X2ISR is supplied in Tape & Reel (TR) format and maintains active product status. Both are 4-SMD, No Lead surface mount packages with identical electrical specifications.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). They meet the same regulatory and environmental standards.

Q: Is the Tape & Reel packaging compatible with my assembly process?

A: Tape & Reel packaging is the standard format for automated surface mount assembly. If your process uses pick-and-place equipment, the 416F400X2ISR in Tape & Reel format is fully compatible and is the preferred format for production environments.

Q: Will the 416F400X2ISR work in existing PCB designs using the 416F400X2IST?

A: Yes. The parts are pin-compatible and dimensionally identical. No PCB redesign is required. The 416F400X2ISR can be used as a direct drop-in replacement in existing designs.

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