ECS-150-S-4 15 MHz Crystal Equivalent & Substitute Parts

Part Overview

The ECS-150-S-4 is a 15 MHz through-hole crystal oscillator in HC-49/US package designed for fundamental mode operation. This part carries a "Not For New Designs" status, indicating it is obsolete or being phased out. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance or redesign initiatives.

Substiute Parts

ECS-150-S-4

ECS Inc.In Stock: 1147ECS-150-S-4 Datasheet

Current PartRFQ

ECS-150-S-4X

ECS Inc.In Stock: 948ECS-150-S-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ECS-150-S-4 is determined by strict equivalence across the following critical parameters:

• Frequency: 15 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• ESR: 40 Ohms (exact match required)
• Package / Case: HC-49/US (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Mode: Fundamental (exact match required)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)

The ECS-150-S-4X meets all substitution criteria as a direct parametric equivalent. The primary distinction is product status: ECS-150-S-4X is Active, whereas ECS-150-S-4 is Not For New Designs.

Parameter Comparison

Engineering Selection Recommendations

The ECS-150-S-4X is the direct substitute for ECS-150-S-4. Selection between these parts is determined by application requirements and regulatory compliance:

For legacy system maintenance where existing inventory of ECS-150-S-4 is available, continued use is acceptable provided the application does not impose new RoHS compliance requirements.

For new designs or systems requiring RoHS3 compliance, ECS-150-S-4X is the appropriate selection. This part maintains identical electrical and mechanical specifications while offering active product status and improved regulatory compliance.

Both parts are manufactured by ECS Inc. and are functionally interchangeable within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can ECS-150-S-4X be used as a direct replacement for ECS-150-S-4?

A: Yes. ECS-150-S-4X is a direct parametric equivalent. All electrical characteristics (frequency, tolerance, stability, ESR) and mechanical specifications (package, dimensions, mounting type) are identical.

Q: What is the difference between ECS-150-S-4 and ECS-150-S-4X?

A: The primary differences are product status and RoHS compliance. ECS-150-S-4 is marked "Not For New Designs" and is RoHS non-compliant. ECS-150-S-4X is Active and ROHS3 Compliant. All functional parameters are identical.

Q: Are there any package or footprint differences?

A: No. Both parts use the HC-49/US package with identical dimensions: 0.447" L x 0.183" W (11.35mm x 4.65mm) and maximum seated height of 0.138" (4.60mm). PCB footprints are identical.

Q: What does "Not For New Designs" mean?

A: This designation indicates the part is obsolete or being phased out by the manufacturer. New designs should use the active equivalent, ECS-150-S-4X.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both parts operate across -10°C to 70°C.

Q: What is the load capacitance specification?

A: Both parts specify Series load capacitance.