ECS-42-12-1 Equivalent & Substitute Parts

Part Overview

The ECS-42-12-1 is a 4.194304 MHz through-hole crystal oscillator in HC-49/U package with 12pF load capacitance and 100 Ohms equivalent series resistance. This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Finding equivalent substitute parts is necessary for legacy system maintenance, repair operations, and applications where this specific frequency and package configuration remain in use.

Substiute Parts

ECS-42-12-1

ECS Inc.In Stock: 1102ECS-42-12-1 Datasheet

Current PartRFQ

ECS-42-12-1X

ECS Inc.In Stock: 1216ECS-42-12-1X Datasheet

Parametric EquivalentRFQ

MP041

CTS-Frequency ControlsIn Stock: 927MP041 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-42-12-1 is determined by strict equivalence across the following critical parameters:

• Frequency: 4.194304 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Load Capacitance: 12pF (exact match required)
• ESR: 100 Ohms (exact match required)
• Package / Case: HC-49/U (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Mode: Fundamental (exact match required)

Two substitute parts meet these criteria: ECS-42-12-1X (parametric equivalent from ECS Inc.) and MP041 (direct manufacturer equivalent from CTS-Frequency Controls). Both parts maintain identical electrical specifications and physical package compatibility with the original component.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts provide full electrical and mechanical compatibility with the ECS-42-12-1. Selection between them should be based on the following factors:

ECS-42-12-1X is the direct parametric equivalent from the original manufacturer ECS Inc., classified as Active product status. This part offers continuity with the original design source and is ROHS3 compliant. The series designation HC-49UX indicates an updated variant within the same product family.

MP041 from CTS-Frequency Controls is an alternative manufacturer equivalent with Active product status and ROHS3 compliance. This part provides an extended operating temperature range of -20°C ~ 70°C compared to the original -10°C ~ 70°C specification. Physical dimensions show minor variation (0.427" L x 0.150" W versus 0.447" L x 0.183" W), though both maintain HC-49/U package compatibility and identical height specifications.

For applications requiring strict adherence to original design specifications and manufacturer continuity, ECS-42-12-1X is the preferred choice. For applications where extended low-temperature operation is beneficial, MP041 offers additional thermal range capability.

Frequently Asked Questions (FAQ)

Q: Can ECS-42-12-1X and MP041 be used interchangeably with ECS-42-12-1?

A: Yes. Both substitute parts maintain identical electrical specifications (frequency, tolerance, load capacitance, ESR) and physical package compatibility (HC-49/U through-hole). Direct pin-for-pin and footprint substitution is supported.

Q: What is the difference between ECS-42-12-1 and ECS-42-12-1X?

A: Both parts are from ECS Inc. and share identical electrical parameters. The primary differences are product status (ECS-42-12-1X is Active versus Not For New Designs) and RoHS compliance (ECS-42-12-1X is ROHS3 compliant). The series designation changed from HC-49U to HC-49UX.

Q: Why does MP041 have a different physical dimension?

A: MP041 from CTS-Frequency Controls maintains HC-49/U package classification and identical height (0.530" maximum seated height). Minor length and width variations (0.427" L x 0.150" W versus 0.447" L x 0.183" W) remain within HC-49/U package tolerances and do not affect PCB footprint compatibility or electrical performance.

Q: Does MP041's extended temperature range affect compatibility?

A: No. MP041's operating range of -20°C ~ 70°C encompasses the original -10°C ~ 70°C specification. The extended low-temperature capability provides additional operational margin without affecting performance within the original temperature window.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both ECS-42-12-1X and MP041 are ROHS3 compliant. The original ECS-42-12-1 is RoHS non-compliant, making the substitutes suitable for applications with RoHS compliance requirements.

Q: What is the inventory status for these parts?

A: ECS-42-12-1 has 1019 pieces in stock (Not For New Designs status). ECS-42-12-1X has 1125 pieces available. MP041 has 869 pieces available. All are listed as new original stock.