ECS-73-20-4 Equivalent & Substitute Parts

Part Overview

The ECS-73-20-4 is a 7.3728 MHz through-hole crystal oscillator in HC-49/US package with 20pF load capacitance and 80 Ohms equivalent series resistance. This part is classified as Not For New Designs, making identification of suitable alternatives essential for ongoing production and maintenance applications. The part operates in fundamental mode across a temperature range of -10°C to 70°C with ±30ppm frequency tolerance and ±50ppm stability.

Key Parameters

Parameter	Value
Frequency	7.3728 MHz
Frequency Tolerance	±30ppm
Load Capacitance	20pF
ESR (Equivalent Series Resistance)	80 Ohms
Operating Mode	Fundamental
Package / Case	HC-49/US
Mounting Type	Through Hole
Size / Dimension	0.447" L x 0.183" W (11.35mm x 4.65mm)
Height - Seated (Max)	0.138" (4.60mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the ECS-73-20-4 is determined by strict equivalence across the following critical parameters:

Frequency: 7.3728 MHz (exact match required)
Frequency Tolerance: ±30ppm (exact match required)
Load Capacitance: 20pF (exact match required)
ESR: 80 Ohms (exact match required)
Operating Mode: Fundamental (exact match required)
Package / Case: HC-49/US (exact match required)
Mounting Type: Through Hole (exact match required)
Physical Dimensions: 0.447" L x 0.183" W, Height 0.138" max (exact match required)

The substitute parts ECS-73-20-4DN and ECS-73-20-4X meet all critical electrical and mechanical parameters. Variations in frequency stability, operating temperature range, product status, and RoHS compliance are secondary considerations that do not affect functional substitutability for the specified electrical characteristics.

Parameter Comparison

Parameter	ECS-73-20-4	ECS-73-20-4DN	ECS-73-20-4X
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 (Equivalent Series Resistance)	80 Ohms	80 Ohms	80 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental
Operating Temperature	-10°C ~ 70°C	-40°C ~ 85°C	-10°C ~ 70°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	HC-49/US	HC-49/US	HC-49/US
Size / Dimension	0.447" L x 0.183" W (11.35mm x 4.65mm)	0.447" L x 0.183" W (11.35mm x 4.65mm)	0.447" L x 0.183" W (11.35mm x 4.65mm)
Height - Seated (Max)	0.138" (4.60mm)	0.138" (4.60mm)	0.138" (4.60mm)
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant
Product Status	Not For New Designs	Active	Active

Engineering Selection Recommendations

Both ECS-73-20-4DN and ECS-73-20-4X are electrically and mechanically equivalent to the ECS-73-20-4 based on the critical parameters that determine crystal oscillator functionality: frequency, tolerance, load capacitance, ESR, and package specifications.

ECS-73-20-4X is recommended for applications requiring RoHS3 compliance. This part maintains identical electrical characteristics and operating temperature range to the original part while meeting modern environmental standards.

ECS-73-20-4DN is suitable for applications requiring extended operating temperature range (-40°C to 85°C). This part is Active status and RoHS non-compliant, matching the compliance profile of the original part while providing broader thermal operation.

Selection between these substitutes should be based on specific application requirements regarding regulatory compliance and thermal operating conditions, not on electrical performance, as all three parts are functionally equivalent for the specified 7.3728 MHz crystal application.

Frequently Asked Questions (FAQ)

Q: Can ECS-73-20-4DN be used as a direct replacement for ECS-73-20-4?

A: Yes. Both parts share identical frequency (7.3728 MHz), frequency tolerance (±30ppm), load capacitance (20pF), ESR (80 Ohms), and HC-49/US package specifications. The ECS-73-20-4DN provides extended operating temperature range (-40°C to 85°C versus -10°C to 70°C) and Active product status.

Q: What is the difference between ECS-73-20-4X and the original ECS-73-20-4?

A: The ECS-73-20-4X is electrically and mechanically identical to ECS-73-20-4 with one key distinction: it is ROHS3 Compliant, whereas the original part is RoHS non-compliant. All critical electrical parameters and physical dimensions are equivalent.

Q: Does frequency stability difference affect substitutability?

A: Frequency stability (±50ppm for ECS-73-20-4 and ECS-73-20-4X, ±100ppm for ECS-73-20-4DN) does not affect substitutability. The controlling parameter for crystal selection is frequency tolerance (±30ppm for all three parts), which defines the allowable deviation from the nominal 7.3728 MHz frequency.

Q: Are all three parts physically interchangeable?

A: Yes. All three 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). Through-hole mounting is identical across all variants.

Q: Which substitute should I select for new production?

A: Both ECS-73-20-4DN and ECS-73-20-4X have Active product status. Selection depends on application requirements: choose ECS-73-20-4X for RoHS3 compliance or ECS-73-20-4DN for extended temperature operation.

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