ECS-49-20-1 Crystal 4.9152MHz 20pF Through Hole Equivalent & Substitute Parts

Part Overview

The ECS-49-20-1 is a 4.9152 MHz fundamental mode crystal oscillator in HC-49/U package with 20pF load capacitance and 55 Ohms equivalent series resistance. This part is classified as Not For New Designs, making identification of active equivalent and substitute components essential for ongoing production support and legacy system maintenance. The part operates across -10°C to 70°C temperature range with ±30ppm frequency tolerance and ±50ppm frequency stability.

Substiute Parts

ECS-49-20-1

ECS Inc.In Stock: 793ECS-49-20-1 Datasheet

Current PartRFQ

ECS-49-20-1X

ECS Inc.In Stock: 2720ECS-49-20-1X Datasheet

Parametric EquivalentRFQ

MP042

CTS-Frequency ControlsIn Stock: 2200MP042 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for 4.9152 MHz through-hole crystals is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 4.9152 MHz (exact match required)
• Load Capacitance: 20pF (exact match required)
• Package / Case: HC-49/U (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Mode: Fundamental (exact match required)

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): ±10 Ohms tolerance acceptable
• Operating Temperature Range: May extend beyond -10°C to 70°C
• Frequency Tolerance: ±30ppm or tighter acceptable
• Frequency Stability: ±50ppm or tighter acceptable

Two substitute parts meet these criteria: ECS-49-20-1X (parametric equivalent from same manufacturer) and MP042 (direct manufacturer alternative from CTS-Frequency Controls).

Parameter Comparison

Engineering Selection Recommendations

ECS-49-20-1X is the primary parametric equivalent. It maintains identical electrical specifications (frequency, load capacitance, ESR, tolerance, and stability) and mechanical compatibility with the original ECS-49-20-1. The key advantage is Active product status and ROHS3 compliance, addressing obsolescence concerns while preserving all functional parameters. This part is recommended for direct replacement in legacy system support where ECS Inc. sourcing is preferred.

MP042 from CTS-Frequency Controls is a direct manufacturer alternative meeting all critical substitution parameters. The ESR specification of 50 Ohms is within acceptable tolerance of the original 55 Ohms specification. The extended operating temperature range (-20°C to 70°C) provides additional thermal margin. MP042 is ROHS3 compliant and carries Active product status. This part is suitable for applications where cross-manufacturer sourcing is acceptable and provides improved long-term availability.

Both substitute parts are suitable for direct replacement based on product status and compliance certifications. Selection between ECS-49-20-1X and MP042 should be based on supply chain strategy, preferred manufacturer relationships, and inventory management requirements.

Frequently Asked Questions (FAQ)

Q: Can ECS-49-20-1X be used as a direct drop-in replacement for ECS-49-20-1?

A: Yes. ECS-49-20-1X maintains identical electrical parameters (4.9152 MHz, 20pF load capacitance, 55 Ohms ESR, ±30ppm tolerance, ±50ppm stability) and mechanical compatibility (HC-49/U package, through-hole mounting). The series designation changes from HC-49U to HC-49UX, but this reflects manufacturing revision without functional impact.

Q: What is the significance of the ESR difference between ECS-49-20-1 (55 Ohms) and MP042 (50 Ohms)?

A: The 5 Ohm difference falls within acceptable engineering tolerance for crystal oscillator substitution. Lower ESR in MP042 may provide marginal improvement in circuit startup characteristics but does not affect frequency accuracy, stability, or load capacitance matching.

Q: Are both substitute parts physically compatible with the original PCB layout?

A: Yes. Both ECS-49-20-1X and MP042 use HC-49/U package with identical through-hole mounting footprint. Physical dimensions are compatible with standard HC-49/U PCB layouts. MP042 has slightly different length (10.85mm vs 11.35mm) and width (3.80mm vs 4.65mm) but maintains the same 13.46mm maximum seated height and HC-49/U package standard.

Q: Why is ECS-49-20-1 marked as Not For New Designs?

A: This designation indicates the part has reached end-of-life status in the manufacturer's product portfolio. ECS-49-20-1X and MP042 are active alternatives that provide equivalent functionality with current manufacturing support and compliance certifications.

Q: What compliance advantage do the substitute parts offer?

A: Both ECS-49-20-1X and MP042 are ROHS3 compliant, whereas the original ECS-49-20-1 is RoHS non-compliant. This is significant for applications subject to RoHS regulations and for long-term supply chain sustainability.