ECS-76.8-20-4 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-76.8-20-4 is a 7.68 MHz through-hole crystal oscillator in HC-49/US package configuration. This component is designed for fundamental mode operation with 20pF load capacitance and 80 Ohms equivalent series resistance. The part is currently active in production and widely used in timing and frequency control applications requiring precise 7.68 MHz oscillation.

Substitute parts are identified when component availability is limited, supply chain disruptions occur, or when design requirements permit selection of functionally equivalent alternatives that meet the same electrical and mechanical specifications.

Substiute Parts

ECS-76.8-20-4

ECS Inc.In Stock: 932ECS-76.8-20-4 Datasheet

Current PartRFQ

ECS-76.8-20-4X

ECS Inc.In Stock: 3254ECS-76.8-20-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-76.8-20-4 is determined by strict equivalence across the following critical parameters:

• Frequency: 7.68 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)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)

The ECS-76.8-20-4X meets all substitution criteria as a parametric equivalent. Both parts are manufactured by ECS Inc. and share identical electrical and mechanical specifications within the allowed tolerance parameters.

Parameter Comparison

Engineering Selection Recommendations

Both ECS-76.8-20-4 and ECS-76.8-20-4X are functionally equivalent for applications requiring 7.68 MHz crystal oscillation with the specified electrical and mechanical parameters.

The primary distinction between these parts is regulatory compliance status. The ECS-76.8-20-4X carries ROHS3 compliance certification, while the ECS-76.8-20-4 is RoHS non-compliant. Selection between these parts should be based on applicable regulatory requirements for the end application and target market.

Both parts maintain identical frequency stability (±50ppm), frequency tolerance (±30ppm), load capacitance (20pF), and ESR (80 Ohms) specifications. Both are rated for the same operating temperature range (-10°C ~ 70°C) and use identical HC-49/US through-hole packaging.

Frequently Asked Questions (FAQ)

Q: Can ECS-76.8-20-4X be used as a direct replacement for ECS-76.8-20-4?

A: Yes. Both parts are parametric equivalents with identical electrical specifications (7.68 MHz, ±30ppm tolerance, 20pF load capacitance, 80 Ohms ESR) and mechanical configuration (HC-49/US through-hole package). The primary difference is RoHS compliance status.

Q: What is the difference between the HC-49US and HC-49USX series designations?

A: The series designation reflects manufacturing variants within the HC-49/US package family. Both variants maintain identical external dimensions (0.447" L x 0.183" W, 11.35mm x 4.65mm) and seated height (0.138" / 4.60mm). The series designation does not affect electrical performance or mechanical compatibility.

Q: Does RoHS compliance affect circuit performance?

A: No. RoHS compliance is a regulatory and material composition requirement, not an electrical performance specification. Both RoHS-compliant and non-compliant variants of this crystal maintain identical frequency, tolerance, ESR, and load capacitance characteristics.

Q: Are both parts suitable for PCB through-hole assembly?

A: Yes. Both ECS-76.8-20-4 and ECS-76.8-20-4X are through-hole mounted components with identical package dimensions and pin configuration. Both are compatible with standard through-hole soldering processes.

Q: What determines substitution eligibility for this crystal?

A: Substitution is based on exact equivalence across frequency (7.68 MHz), frequency tolerance (±30ppm), load capacitance (20pF), ESR (80 Ohms), operating mode (Fundamental), package type (HC-49/US), mounting method (Through Hole), and operating temperature range (-10°C ~ 70°C). Deviations in any of these parameters disqualify a part as a direct substitute.