ECS-42-12-4 Crystal Oscillator Equivalent & Substitute Parts

Part Overview

The ECS-42-12-4 is a 4.194304 MHz through-hole crystal oscillator in HC-49/US package configuration. This component operates at fundamental mode with 12pF load capacitance and 150 Ohms equivalent series resistance. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent substitute parts is necessary for legacy system maintenance, repair operations, and continued production support where original specifications must be maintained.

Substiute Parts

ECS-42-12-4

ECS Inc.In Stock: 1535ECS-42-12-4 Datasheet

Current PartRFQ

ECS-42-12-4X

ECS Inc.In Stock: 1403ECS-42-12-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-42-12-4 is determined by strict equivalence across the following critical parameters:

• Frequency: 4.194304 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Load Capacitance: 12pF (exact match required)
• ESR: 150 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 to 70°C (exact match required)

The ECS-42-12-4X meets all substitution criteria as a parametric equivalent. Both parts share identical electrical specifications and mechanical form factors, ensuring direct interchangeability in circuit applications without design modification.

Parameter Comparison

Engineering Selection Recommendations

The ECS-42-12-4X serves as the direct parametric equivalent for the ECS-42-12-4. Selection between these parts should be based on the following criteria:

For Legacy System Maintenance: The ECS-42-12-4 remains available with 1449 units in stock. Use this part only when exact original component matching is required for historical documentation or when substitute availability is constrained.

For New Production and Repair Operations: The ECS-42-12-4X is the preferred selection. This part maintains identical electrical and mechanical specifications while offering Active product status and ROHS3 compliance. The ECS-42-12-4X provides 1313 units in current inventory.

Compliance Considerations: The ECS-42-12-4X provides superior regulatory compliance through ROHS3 certification, whereas the original ECS-42-12-4 is RoHS non-compliant. Both parts share identical REACH Unaffected and EAR99 ECCN classifications.

Frequently Asked Questions (FAQ)

Q: Can the ECS-42-12-4X be used as a direct replacement for the ECS-42-12-4?

A: Yes. The ECS-42-12-4X is a parametric equivalent with identical frequency (4.194304 MHz), frequency tolerance (±30ppm), load capacitance (12pF), ESR (150 Ohms), operating mode (Fundamental), package (HC-49/US), and temperature range (-10°C to 70°C). No circuit modifications are required.

Q: What is the difference between the ECS-42-12-4 and ECS-42-12-4X?

A: The primary differences are product status and regulatory compliance. The ECS-42-12-4 is classified as "Not For New Designs" with RoHS non-compliant status. The ECS-42-12-4X is Active and ROHS3 compliant. All electrical and mechanical parameters are identical.

Q: Are there any package or mounting differences between these parts?

A: No. Both parts use the HC-49/US package with through-hole mounting. Physical dimensions (0.447" L x 0.183" W, 11.35mm x 4.65mm) and seated height (0.138" / 4.60mm maximum) are identical.

Q: Which part should be selected for new designs?

A: The ECS-42-12-4X should be selected for new designs. The ECS-42-12-4 carries "Not For New Designs" status, indicating end-of-life classification.

Q: Are both parts available in the same packaging format?

A: Yes. Both parts are supplied in Bulk packaging. Current inventory shows 1449 units for ECS-42-12-4 and 1313 units for ECS-42-12-4X.