ECS-40-20-4DN 4 MHz Crystal Equivalent & Substitute Parts

Part Overview

The ECS-40-20-4DN is a 4 MHz through-hole crystal oscillator in HC-49/US package with 20pF load capacitance and 150 Ohms equivalent series resistance. This part is classified as "Not For New Designs," indicating it has been superseded. Finding equivalent or substitute parts is necessary for legacy system maintenance, repair, and component sourcing when original inventory becomes unavailable.

Substiute Parts

ECS-40-20-4DN

ECS Inc.In Stock: 1319ECS-40-20-4DN Datasheet

Current PartRFQ

ECS-40-20-4

ECS Inc.In Stock: 2065ECS-40-20-4 Datasheet

SimilarRFQ

ECS-40-20-4XDN

ECS Inc.In Stock: 10189ECS-40-20-4XDN Datasheet

Parametric EquivalentRFQ

HC-49/U-S4000000AHKB

Citizen Finedevice Co LtdIn Stock: 1164HC-49/U-S4000000AHKB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-40-20-4DN is determined by the following critical parameters:

• Frequency: Must be 4 MHz (exact match required)
• Frequency Tolerance: Must be ±30ppm or tighter
• Load Capacitance: Must be 20pF (exact match required)
• ESR: Must be 150 Ohms (exact match required)
• Package / Case: Must be HC-49/US (exact match required)
• Mounting Type: Must be Through Hole (exact match required)
• Operating Temperature Range: Must cover or exceed -40°C ~ 85°C

Parts meeting all these criteria are classified as direct substitutes. Parts with identical electrical specifications but different product status or compliance certifications are listed as parametric equivalents.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: ECS-40-20-4XDN

The ECS-40-20-4XDN is the recommended substitute for the ECS-40-20-4DN. Both parts share identical electrical specifications (4 MHz, ±30ppm tolerance, 20pF load capacitance, 150 Ohms ESR) and identical operating temperature range (-40°C ~ 85°C). The ECS-40-20-4XDN is classified as Active product status and is ROHS3 compliant, making it suitable for new applications and long-term availability.

Alternative Substitute: HC-49/U-S4000000AHKB

The HC-49/U-S4000000AHKB from Citizen Finedevice Co Ltd meets all electrical and mechanical specifications of the ECS-40-20-4DN. This part is Active and ROHS3 compliant. The physical dimensions differ slightly (11.50mm L x 4.66mm W versus 11.35mm L x 4.65mm W), but remain within HC-49/US package specifications.

Limited Substitute: ECS-40-20-4

The ECS-40-20-4 shares identical electrical specifications but has a reduced operating temperature range (-10°C ~ 70°C). This part is suitable only for applications where the full -40°C ~ 85°C range is not required. Both the main part and this substitute are classified as "Not For New Designs."

Frequently Asked Questions (FAQ)

Q: Can ECS-40-20-4XDN directly replace ECS-40-20-4DN in existing designs?

A: Yes. Both parts have identical frequency (4 MHz), frequency tolerance (±30ppm), load capacitance (20pF), ESR (150 Ohms), package (HC-49/US), and operating temperature range (-40°C ~ 85°C). Direct substitution is supported at the electrical and mechanical level.

Q: What is the difference between ECS-40-20-4DN and ECS-40-20-4?

A: The primary difference is operating temperature range. ECS-40-20-4DN operates from -40°C to 85°C, while ECS-40-20-4 operates from -10°C to 70°C. All other electrical parameters are identical. ECS-40-20-4 is suitable only for applications not requiring the full temperature range.

Q: Why is HC-49/U-S4000000AHKB listed as a substitute if it is from a different manufacturer?

A: HC-49/U-S4000000AHKB from Citizen Finedevice Co Ltd meets all critical electrical specifications (frequency, tolerance, load capacitance, ESR) and package requirements (HC-49/US through-hole). Cross-manufacturer substitution is valid when all functional parameters match.

Q: Are there any compliance differences between the substitute parts?

A: Yes. ECS-40-20-4DN and ECS-40-20-4 are RoHS non-compliant. ECS-40-20-4XDN and HC-49/U-S4000000AHKB are ROHS3 compliant. For applications requiring RoHS compliance, use ECS-40-20-4XDN or HC-49/U-S4000000AHKB.

Q: What does "Not For New Designs" mean for the ECS-40-20-4DN?

A: This designation indicates the part has been superseded and is no longer recommended for new product development. It remains available for legacy system support and repair. For new designs, use ECS-40-20-4XDN or HC-49/U-S4000000AHKB.

Q: Are the physical dimensions of all substitutes identical?

A: HC-49/U-S4000000AHKB has slightly different dimensions (11.50mm L x 4.66mm W) compared to ECS-40-20-4DN (11.35mm L x 4.65mm W), but both conform to HC-49/US package specifications. ECS-40-20-4XDN has identical dimensions to ECS-40-20-4DN.