ECS-73-20-5P-TR Crystal Equivalent & Substitute Parts

Part Overview

The ECS-73-20-5P-TR is a 7.3728 MHz surface mount crystal oscillator in HC-49/US package with 20pF load capacitance and 60 Ohms equivalent series resistance. This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Organizations using this part in active applications require equivalent alternatives that maintain electrical and mechanical compatibility while potentially offering improved product status or compliance certifications.

Key Parameters

Parameter	Value
Frequency	7.3728 MHz
Frequency Tolerance	±30ppm
Load Capacitance	20pF
ESR (Equivalent Series Resistance)	60 Ohms
Package / Case	HC-49/US
Mounting Type	Surface Mount
Operating Mode	Fundamental
Size / Dimension	0.449" L x 0.189" W (11.40mm x 4.80mm)
Height - Seated (Max)	0.169" (4.30mm)

Substitute Part Grouping Explanation

Substitution eligibility for crystal oscillators is determined by matching the following critical parameters:

Frequency: 7.3728 MHz (exact match required)
Frequency Tolerance: ±30ppm (exact match required)
Load Capacitance: 20pF (exact match required)
ESR: 60 Ohms (exact match required)
Package / Case: HC-49/US (exact match required)
Mounting Type: Surface Mount (exact match required)
Operating Mode: Fundamental (exact match required)
Physical Dimensions: 0.449" L x 0.189" W, Height 0.169" max (exact match required)

The substitute parts ECS-73-20-5PDN-TR and ECS-73-20-5PX-TR meet all critical electrical and mechanical parameters. Variations in frequency stability, operating temperature range, product status, and compliance certifications do not affect functional substitutability for applications where the main part specifications are met.

Parameter Comparison

Parameter	ECS-73-20-5P-TR	ECS-73-20-5PDN-TR	ECS-73-20-5PX-TR
Frequency	7.3728 MHz	7.3728 MHz	7.3728 MHz
Frequency Tolerance	±30ppm	±30ppm	±30ppm
Frequency Stability	±50ppm	±100ppm	±50ppm
Load Capacitance	20pF	20pF	20pF
ESR	60 Ohms	60 Ohms	60 Ohms
Operating Temperature	-10°C ~ 70°C	-40°C ~ 85°C	-10°C ~ 70°C
Package / Case	HC-49/US	HC-49/US	HC-49/US
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size / Dimension	0.449" L x 0.189" W (11.40mm x 4.80mm)	0.449" L x 0.189" W (11.40mm x 4.80mm)	0.449" L x 0.189" W (11.40mm x 4.80mm)
Height - Seated (Max)	0.169" (4.30mm)	0.169" (4.30mm)	0.169" (4.30mm)
Product Status	Not For New Designs	Not For New Designs	Active
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

ECS-73-20-5PX-TR is the preferred substitute for new applications and ongoing production. This part maintains identical electrical and mechanical specifications while offering Active product status and ROHS3 compliance. The CSM-7X series designation indicates current manufacturing support.

ECS-73-20-5PDN-TR is functionally equivalent and available as an alternative. This part operates across an extended temperature range (-40°C ~ 85°C) compared to the main part (-10°C ~ 70°C), providing broader environmental tolerance. However, it retains Not For New Designs status and RoHS non-compliance.

Both substitute parts are direct replacements in existing designs without circuit modification or re-qualification requirements, provided the application specifications align with the stated electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can ECS-73-20-5PX-TR replace ECS-73-20-5P-TR in existing designs?

A: Yes. Both parts share identical frequency (7.3728 MHz), load capacitance (20pF), ESR (60 Ohms), package (HC-49/US), and physical dimensions. No circuit changes are required.

Q: What is the difference between frequency tolerance and frequency stability?

A: Frequency tolerance (±30ppm for all three parts) specifies the initial accuracy at room temperature. Frequency stability (±50ppm for ECS-73-20-5P-TR and ECS-73-20-5PX-TR; ±100ppm for ECS-73-20-5PDN-TR) indicates the maximum frequency variation over the operating temperature range.

Q: Why does ECS-73-20-5PDN-TR have a wider operating temperature range?

A: ECS-73-20-5PDN-TR is rated -40°C ~ 85°C versus -10°C ~ 70°C for the other parts. This extended range does not affect substitutability; it indicates the part is qualified for broader environmental conditions.

Q: Is RoHS compliance required for my application?

A: RoHS compliance depends on your end-market and regulatory requirements. ECS-73-20-5PX-TR is ROHS3 compliant; ECS-73-20-5P-TR and ECS-73-20-5PDN-TR are not. Verify your application's compliance obligations before selection.

Q: Are all three parts in the same HC-49/US package?

A: Yes. All three parts use HC-49/US package with identical dimensions: 0.449" L x 0.189" W (11.40mm x 4.80mm) and maximum seated height of 0.169" (4.30mm). PCB footprints and mechanical mounting are identical.

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

A: This designation indicates the manufacturer has discontinued active development and recommends using alternative parts for new applications. ECS-73-20-5PX-TR (Active status) is the recommended choice for new designs.

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