ECS-36-20-5P-TR 3.6864 MHz Crystal Equivalent & Substitute Parts

Part Overview

The ECS-36-20-5P-TR is a 3.6864 MHz surface mount crystal oscillator in HC-49/US package with 20pF load capacitance and 150 Ohms equivalent series resistance. This part carries a "Not For New Designs" status, making identification of suitable alternatives essential for ongoing production and new design implementations. The crystal operates in fundamental mode across a -10°C to 70°C temperature range with ±30ppm frequency tolerance.

Key Parameters

Parameter	Value
Frequency	3.6864 MHz
Load Capacitance	20pF
Frequency Tolerance	±30ppm
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

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-36-20-5P-TR is determined by strict alignment of the following critical parameters:

Frequency: 3.6864 MHz (exact match required)
Load Capacitance: 20pF (exact match required)
Frequency Tolerance: ±30ppm (exact match required)
ESR: 150 Ohms (exact match required)
Package / Case: HC-49/US (exact match required)
Operating Mode: Fundamental (exact match required)
Mounting Type: Surface Mount (exact match required)

Substitute parts are classified into three categories based on their relationship to the main part:

Direct Manufacturer Equivalent: Parts with identical electrical specifications and packaging but different series designation or product status.

Similar Manufacturer Part: Parts meeting core electrical parameters but with variations in frequency stability, operating temperature range, or product lifecycle status.

Parametric Equivalent: Parts with identical electrical and mechanical specifications, representing active alternatives suitable for new designs.

Parameter Comparison

Parameter	ECS-36-20-5P-TR	ECS-36-20-5PVX	ECS-36-20-5PDN-TR	ECS-36-20-5PX-TR
Frequency	3.6864 MHz	3.6864 MHz	3.6864 MHz	3.6864 MHz
Load Capacitance	20pF	20pF	20pF	20pF
Frequency Tolerance	±30ppm	±30ppm	±30ppm	±30ppm
Frequency Stability	±50ppm	±50ppm	±100ppm	±50ppm
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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Height - Seated (Max)	0.169" (4.30mm)	0.102" (2.60mm)	0.169" (4.30mm)	0.169" (4.30mm)
Packaging	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Not For New Designs	Active	Not For New Designs	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

For New Designs: ECS-36-20-5PX-TR is the recommended primary choice. This part maintains identical electrical and mechanical specifications to the main part while carrying Active product status and ROHS3 compliance. It is available in Tape & Reel packaging with 48,250 pieces in stock.

Alternative for New Designs: ECS-36-20-5PVX provides an active alternative with ROHS3 compliance. This part is supplied in Cut Tape packaging and features a reduced seated height of 0.102" (2.60mm) compared to the standard 0.169" (4.30mm). This dimensional difference may be advantageous in space-constrained applications. Inventory availability is 1,682 pieces.

For Existing Production: ECS-36-20-5PDN-TR maintains compatibility with the original ECS-36-20-5P-TR across all critical electrical parameters. However, this part exhibits wider frequency stability (±100ppm versus ±50ppm) and an extended operating temperature range (-40°C ~ 85°C versus -10°C ~ 70°C). Selection should be based on whether the application requires the extended temperature performance. This part is available in Tape & Reel packaging with 12,553 pieces in stock.

Frequently Asked Questions (FAQ)

Q: Can ECS-36-20-5PVX be used as a direct replacement for ECS-36-20-5P-TR?

A: Yes, ECS-36-20-5PVX meets all critical electrical specifications: 3.6864 MHz frequency, 20pF load capacitance, ±30ppm tolerance, and 150 Ohms ESR. The primary difference is packaging format (Cut Tape versus Tape & Reel) and a reduced seated height of 0.102" versus 0.169". Verify that the lower profile and packaging format are compatible with your assembly process.

Q: What is the significance of the frequency stability difference in ECS-36-20-5PDN-TR?

A: ECS-36-20-5PDN-TR specifies ±100ppm frequency stability compared to ±50ppm for the main part. Frequency stability describes the maximum frequency change over the operating temperature range. The ±30ppm frequency tolerance specification remains identical across all parts. Selection depends on whether your circuit design requires the tighter stability performance of ±50ppm.

Q: Why does ECS-36-20-5PX-TR have a different series designation (CSM-7X)?

A: Series designation reflects internal ECS manufacturing classifications. ECS-36-20-5PX-TR (CSM-7X series) is the active production equivalent to ECS-36-20-5P-TR (CSM-7 series). All electrical and mechanical parameters remain identical, with the primary advantage being Active product status and ROHS3 compliance.

Q: Is the height difference between ECS-36-20-5PVX and other substitutes significant?

A: ECS-36-20-5PVX has a maximum seated height of 0.102" (2.60mm) compared to 0.169" (4.30mm) for other substitutes. This 0.067" (1.70mm) reduction may be critical in applications with vertical space constraints. Verify PCB layout and component clearance requirements before selection.

Q: What is the impact of RoHS compliance on part selection?

A: ECS-36-20-5PX-TR and ECS-36-20-5PVX carry ROHS3 compliance, while ECS-36-20-5P-TR and ECS-36-20-5PDN-TR are RoHS non-compliant. If your application or market requires RoHS compliance, selection must be limited to the compliant alternatives.

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