ECS-85-S-4 8.5 MHz Crystal Equivalent & Substitute Parts

Part Overview

The ECS-85-S-4 is an 8.5 MHz through-hole crystal oscillator in HC-49/US package configuration. This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. For new applications or when stock of the original part becomes unavailable, identifying parametrically equivalent substitutes ensures design continuity and maintains circuit performance specifications.

Substiute Parts

ECS-85-S-4

ECS Inc.In Stock: 1217ECS-85-S-4 Datasheet

Current PartRFQ

ECS-85-S-4X

ECS Inc.In Stock: 1972ECS-85-S-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ECS-85-S-4 is determined by strict equivalence across electrical and mechanical parameters. The following criteria establish valid substitutes:

• Frequency: 8.5 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Frequency Stability: ±50ppm (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)
• Load Capacitance: Series (exact match required)

The ECS-85-S-4X meets all these criteria and qualifies as a parametric equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

The ECS-85-S-4X is the direct parametric equivalent for the ECS-85-S-4. Both parts maintain identical electrical specifications across frequency, tolerance, stability, and impedance characteristics. The primary distinction is product lifecycle status: the ECS-85-S-4 is designated Not For New Designs, while the ECS-85-S-4X carries Active status.

For applications requiring RoHS compliance, the ECS-85-S-4X provides ROHS3 compliance, whereas the original ECS-85-S-4 is RoHS non-compliant. Both parts are REACH Unaffected and classified under ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can the ECS-85-S-4X be used as a direct replacement for the ECS-85-S-4?

A: Yes. The ECS-85-S-4X is parametrically equivalent across all electrical and mechanical specifications, including frequency, tolerance, stability, ESR, operating mode, package type, and temperature range. No circuit modifications are required.

Q: What is the difference between the ECS-85-S-4 and ECS-85-S-4X?

A: The parts are electrically and mechanically identical. The ECS-85-S-4X is the current production equivalent with Active product status and ROHS3 compliance, whereas the ECS-85-S-4 is Not For New Designs and RoHS non-compliant.

Q: Are both parts in the same HC-49/US package?

A: Yes. Both the ECS-85-S-4 and ECS-85-S-4X use the HC-49/US through-hole package with identical dimensions: 0.447" L x 0.183" W (11.35mm x 4.65mm) and maximum seated height of 0.138" (4.60mm).

Q: Does the ECS-85-S-4X meet RoHS requirements?

A: Yes. The ECS-85-S-4X is ROHS3 compliant. If RoHS compliance is a design requirement, the ECS-85-S-4X is the appropriate selection.

Q: What is the operating temperature range for these crystals?

A: Both parts operate across -10°C to 70°C. This range applies to frequency stability and tolerance specifications.