ECS-49-S-4 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-49-S-4 is a 4.9152 MHz through-hole crystal oscillator in HC-49/US package configuration, designed for fundamental mode operation with 150 Ohms equivalent series resistance. This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Identifying equivalent substitute parts is necessary for legacy system maintenance, repair operations, and applications where existing designs require component replacement or inventory replenishment.

Substiute Parts

ECS-49-S-4

ECS Inc.In Stock: 944ECS-49-S-4 Datasheet

Current PartRFQ

ECS-49-S-4X

ECS Inc.In Stock: 729ECS-49-S-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-49-S-4 is determined by strict parametric matching across the following critical criteria:

Frequency matching at 4.9152 MHz with identical tolerance specifications (±30ppm) and stability rating (±50ppm) ensures direct functional equivalence in oscillator circuits. ESR of 150 Ohms must remain constant to maintain circuit impedance characteristics and oscillation reliability. Series load capacitance configuration must be preserved. Fundamental operating mode is required for frequency accuracy. Operating temperature range of -10°C ~ 70°C must be maintained or exceeded. Through-hole mounting type and HC-49/US package form factor are mandatory for mechanical and electrical compatibility. Physical dimensions and seated height must match to ensure PCB layout compatibility and component clearance.

The ECS-49-S-4X qualifies as a parametric equivalent substitute based on complete alignment with all specified parameters.

Parameter Comparison

Engineering Selection Recommendations

The ECS-49-S-4X is the direct parametric equivalent for the ECS-49-S-4. All electrical and mechanical specifications align identically. The primary distinction is product lifecycle status: the ECS-49-S-4 is designated Not For New Designs, while the ECS-49-S-4X maintains Active status in the manufacturer's current product portfolio. Additionally, the ECS-49-S-4X achieves ROHS3 compliance, whereas the original part is RoHS non-compliant. For applications requiring component replacement or inventory replenishment, the ECS-49-S-4X provides equivalent functionality with the advantage of current manufacturing support and improved regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the ECS-49-S-4X be used as a direct replacement for the ECS-49-S-4?

A: Yes. The ECS-49-S-4X is a parametric equivalent with identical frequency, tolerance, stability, ESR, load capacitance, operating mode, temperature range, mounting type, package, and physical dimensions. No circuit modifications are required.

Q: What is the significance of the "Not For New Designs" status on the ECS-49-S-4?

A: This designation indicates the part has been superseded in the manufacturer's product line. The ECS-49-S-4X is the active equivalent and is recommended for all new applications and component replenishment.

Q: Are there any compliance differences between these parts?

A: Yes. The ECS-49-S-4X is ROHS3 compliant, while the ECS-49-S-4 is RoHS non-compliant. Both parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: Will the ECS-49-S-4X fit the same PCB footprint as the ECS-49-S-4?

A: Yes. Both parts share identical through-hole mounting specifications, HC-49/US package configuration, physical dimensions of 0.447" L x 0.183" W (11.35mm x 4.65mm), and maximum seated height of 0.138" (4.60mm). No PCB layout modifications are necessary.

Q: Are the frequency and tolerance specifications identical?

A: Yes. Both parts operate at 4.9152 MHz with ±30ppm frequency tolerance and ±50ppm frequency stability. Circuit performance will be equivalent.