ECS-40-20-4 Equivalent & Substitute Parts

Part Overview

The ECS-40-20-4 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 carries a "Not For New Designs" status, making substitute parts necessary for ongoing production and new applications. The fundamental operating mode and specified frequency tolerance of ±30ppm establish the baseline for equivalent component selection.

Key Parameters

Parameter	Value
Frequency	4 MHz
Frequency Tolerance	±30ppm
Load Capacitance	20pF
ESR (Equivalent Series Resistance)	150 Ohms
Package / Case	HC-49/US
Mounting Type	Through Hole
Operating Mode	Fundamental

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-40-20-4 is determined by strict parameter matching across the following criteria:

Critical Parameters (Must Match):

Frequency: 4 MHz
Frequency Tolerance: ±30ppm
Load Capacitance: 20pF
ESR: 150 Ohms
Package / Case: HC-49/US
Mounting Type: Through Hole
Operating Mode: Fundamental

Allowable Variations:

Frequency Stability: May differ (±50ppm or ±100ppm acceptable)
Operating Temperature Range: May extend beyond -10°C ~ 70°C
Physical Dimensions: Minor variations within HC-49/US specification
RoHS Compliance: May upgrade from non-compliant to compliant
Product Status: May transition from obsolete to active

All three substitute parts (ECS-40-20-4X, ECS-40-20-4DN, ECS-40-20-4VX) meet these critical parameter requirements.

Parameter Comparison

Parameter	ECS-40-20-4	ECS-40-20-4X	ECS-40-20-4DN	ECS-40-20-4VX
Frequency	4 MHz	4 MHz	4 MHz	4 MHz
Frequency Tolerance	±30ppm	±30ppm	±30ppm	±30ppm
Frequency Stability	±50ppm	±50ppm	±100ppm	±50ppm
Load Capacitance	20pF	20pF	20pF	20pF
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	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Not For New Designs	Active	Not For New Designs	Active
RoHS Status	Non-compliant	ROHS3 Compliant	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

For New Designs: ECS-40-20-4X and ECS-40-20-4VX are the preferred selections. Both parts carry Active product status and ROHS3 compliance, meeting current regulatory requirements and ensuring long-term supply availability. ECS-40-20-4X maintains identical physical dimensions to the original part (0.447" L x 0.183" W, 0.138" seated height), while ECS-40-20-4VX offers a more compact profile (0.083" seated height) within the same HC-49/US package specification.

For Legacy System Maintenance: ECS-40-20-4DN provides functional equivalence with extended operating temperature range (-40°C ~ 85°C), suitable for applications requiring broader thermal performance. However, this part retains "Not For New Designs" status and RoHS non-compliance.

Compliance Considerations: If RoHS3 compliance is mandatory, ECS-40-20-4X or ECS-40-20-4VX must be selected. Both alternatives satisfy this requirement while maintaining all critical electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can ECS-40-20-4DN be used as a direct replacement for ECS-40-20-4?

A: Yes, from an electrical standpoint. Both parts share identical frequency (4 MHz), tolerance (±30ppm), load capacitance (20pF), and ESR (150 Ohms). The ECS-40-20-4DN extends the operating temperature range to -40°C ~ 85°C, which is compatible with applications designed for the original -10°C ~ 70°C range. However, the higher frequency stability specification (±100ppm vs. ±50ppm) may affect timing-critical applications.

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

A: Both parts are electrically identical and carry Active product status with ROHS3 compliance. The primary difference is physical: ECS-40-20-4VX has a reduced seated height (0.083" vs. 0.138"), which may be advantageous for space-constrained PCB layouts. Both remain within HC-49/US package specification.

Q: Why is the original ECS-40-20-4 marked "Not For New Designs"?

A: This designation indicates the part is in end-of-life status. ECS-40-20-4X and ECS-40-20-4VX are the active alternatives that should be used for new product development to ensure supply continuity and compliance with current standards.

Q: Are all substitute parts pin-compatible?

A: Yes. All parts use the HC-49/US through-hole package with identical pinout and mounting footprint, ensuring direct PCB compatibility.

Q: Does frequency stability affect circuit performance?

A: Frequency stability (±50ppm vs. ±100ppm) defines long-term frequency drift over the operating temperature range. Applications with strict timing requirements should maintain ±50ppm specification. ECS-40-20-4DN's ±100ppm stability may be acceptable for less timing-sensitive applications.

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