ECS-35-17-5P-TR Crystal Oscillator Equivalent & Substitute Parts

Part Overview

The ECS-35-17-5P-TR is a 4.679545 MHz surface mount crystal oscillator in HC-49/US package with 17pF load capacitance and 150 Ohms equivalent series resistance. This part is classified as Not For New Designs, indicating it has been superseded in the product lifecycle. Alternative equivalent and substitute parts are available to support ongoing applications and legacy system requirements.

Key Parameters

Parameter	Value
Frequency	4.679545 MHz
Frequency Tolerance	±30ppm
Load Capacitance	17pF
ESR (Equivalent Series Resistance)	150 Ohms
Operating Mode	Fundamental
Package / Case	HC-49/US
Mounting Type	Surface Mount
Operating Temperature Range	-10°C ~ 70°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the ECS-35-17-5P-TR is determined by strict alignment of electrical and mechanical parameters. The critical parameters for substitution are:

Frequency: 4.679545 MHz (exact match required)
Frequency Tolerance: ±30ppm (exact match required)
Load Capacitance: 17pF or 18pF (minor variation acceptable within circuit design margins)
ESR: 150 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)

Substitute parts are grouped into two categories:

Parametric Equivalent (Direct Substitution): Parts with identical electrical specifications and package dimensions, differing only in product status or series designation.

Similar Substitute (Load Capacitance Variation): Parts with 18pF load capacitance instead of 17pF, requiring circuit-level evaluation for compatibility.

Parameter Comparison

Parameter	ECS-35-17-5P-TR (Main)	ECS-35-17-5PX-TR	ECS-35-17-5PDN-TR	ECS-35-18-5PVX
Frequency	4.679545 MHz	4.679545 MHz	4.679545 MHz	4.679545 MHz
Frequency Tolerance	±30ppm	±30ppm	±30ppm	±30ppm
Frequency Stability	±50ppm	±50ppm	±100ppm	±50ppm
Load Capacitance	17pF	17pF	17pF	18pF
ESR	150 Ohms	150 Ohms	150 Ohms	150 Ohms
Operating Temperature	-10°C ~ 70°C	-10°C ~ 70°C	-40°C ~ 85°C	-10°C ~ 70°C
Package / Case	HC-49/US	HC-49/US	HC-49/US	HC-49/US
Height - Seated (Max)	0.169" (4.30mm)	0.169" (4.30mm)	0.169" (4.30mm)	0.102" (2.60mm)
Product Status	Not For New Designs	Active	Not For New Designs	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Inventory	2815 Pcs	13885 Pcs	1986 Pcs	2000 Pcs

Engineering Selection Recommendations

ECS-35-17-5PX-TR is the primary parametric equivalent for direct substitution. It maintains identical electrical specifications (frequency, tolerance, load capacitance, ESR) and package dimensions as the main part. This part carries Active product status and ROHS3 compliance, making it suitable for new applications while providing backward compatibility for legacy designs.

ECS-35-17-5PDN-TR provides parametric equivalence with extended operating temperature range (-40°C ~ 85°C versus -10°C ~ 70°C). Frequency stability is specified at ±100ppm compared to ±50ppm for the main part. This part is classified as Not For New Designs. Selection of this part requires confirmation that the wider temperature range and relaxed frequency stability do not conflict with application requirements.

ECS-35-18-5PVX is a similar substitute with 18pF load capacitance instead of 17pF. This part is Active and ROHS3 compliant. The load capacitance difference requires circuit-level evaluation to confirm compatibility with the oscillator circuit design. Physical height is reduced to 0.102" (2.60mm) compared to 0.169" (4.30mm) for other parts, which may affect PCB layout considerations.

Frequently Asked Questions (FAQ)

Q: Can ECS-35-18-5PVX be used as a direct replacement for ECS-35-17-5P-TR?

A: ECS-35-18-5PVX differs in load capacitance (18pF versus 17pF). While frequency and ESR are identical, the load capacitance variation affects oscillator circuit behavior. Circuit-level evaluation is required to confirm compatibility with the specific oscillator design.

Q: What is the difference between ECS-35-17-5PX-TR and ECS-35-17-5PDN-TR?

A: Both parts maintain 17pF load capacitance and ±30ppm frequency tolerance. ECS-35-17-5PDN-TR offers extended operating temperature range (-40°C ~ 85°C) and relaxed frequency stability (±100ppm). ECS-35-17-5PX-TR is Active status with ±50ppm frequency stability and standard temperature range (-10°C ~ 70°C).

Q: Does the height difference between ECS-35-18-5PVX and other substitutes affect compatibility?

A: ECS-35-18-5PVX has a maximum seated height of 0.102" (2.60mm) compared to 0.169" (4.30mm) for other parts. This reduced height may require PCB layout verification to confirm clearance and component placement compatibility.

Q: Are all substitute parts RoHS compliant?

A: ECS-35-17-5PX-TR and ECS-35-18-5PVX are ROHS3 compliant. ECS-35-17-5P-TR and ECS-35-17-5PDN-TR are RoHS non-compliant. Regulatory requirements for the application determine which parts are acceptable.

Q: Which substitute part is recommended for new designs?

A: ECS-35-17-5PX-TR is the recommended choice for new designs. It is Active status, ROHS3 compliant, maintains identical electrical specifications to the main part, and has the highest inventory availability (13885 Pcs).

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