ECS-40-S-7S-TR 4 MHz Crystal Equivalent & Substitute Parts

Part Overview

The ECS-40-S-7S-TR is a 4 MHz fundamental mode crystal oscillator in a 4-SOJ surface mount package with 150 Ohms equivalent series resistance (ESR). This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent substitute parts is necessary for legacy system maintenance, repair operations, and inventory replenishment where original stock is depleted.

Substiute Parts

ECS-40-S-7S-TR

ECS Inc.In Stock: 1245ECS-40-S-7S-TR Datasheet

Current PartRFQ

ECS-40-S-7SX-TR

ECS Inc.In Stock: 4000ECS-40-S-7SX-TR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-40-S-7S-TR is determined by strict equivalence across the following critical parameters:

• Frequency: 4 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Frequency Stability: ±50ppm (exact match required)
• ESR: 150 Ohms (exact match required)
• Operating Mode: Fundamental (exact match required)
• Load Capacitance: Series (exact match required)
• Package / Case: 4-SOJ, 9.40mm pitch (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)
• Physical Dimensions: 0.492" L x 0.181" W, 0.146" max height (exact match required)
• MSL Rating: 1 (Unlimited) (exact match required)

The ECS-40-S-7SX-TR meets all substitution criteria as a parametric equivalent. The primary distinction between these parts is the series designation (ECX-3S versus ECX-3SX) and RoHS compliance status.

Parameter Comparison

Engineering Selection Recommendations

The ECS-40-S-7SX-TR is a direct parametric equivalent to the ECS-40-S-7S-TR. Both parts are classified as "Not For New Designs" and share identical electrical and mechanical specifications.

The primary differentiator is regulatory compliance: the ECS-40-S-7SX-TR is ROHS3 compliant, while the ECS-40-S-7S-TR is RoHS non-compliant. For applications subject to RoHS directives or procurement policies requiring RoHS compliance, the ECS-40-S-7SX-TR is the appropriate selection. Both parts maintain REACH Unaffected status.

Selection between these parts should be based on compliance requirements of the target application and regulatory jurisdiction. Electrical performance and mechanical compatibility are identical.

Frequently Asked Questions (FAQ)

Q: Can the ECS-40-S-7SX-TR be used as a direct replacement for the ECS-40-S-7S-TR?

A: Yes. The ECS-40-S-7SX-TR is a parametric equivalent with identical frequency, tolerance, stability, ESR, operating mode, load capacitance, package, mounting type, temperature range, and physical dimensions. No circuit modifications are required.

Q: What is the difference between these two parts?

A: The primary difference is RoHS compliance status. The ECS-40-S-7SX-TR is ROHS3 compliant; the ECS-40-S-7S-TR is RoHS non-compliant. Both parts are electrically and mechanically identical.

Q: Are there any package or pinout differences?

A: No. Both parts use the 4-SOJ package with 9.40mm pitch and identical physical dimensions (0.492" L x 0.181" W, 0.146" max height).

Q: Which part should I select for new applications?

A: Both parts are classified as "Not For New Designs." For new designs, consult ECS Inc. for current production alternatives in the 4 MHz crystal category.

Q: Are the frequency specifications identical?

A: Yes. Both parts operate at 4 MHz with ±30ppm tolerance, ±50ppm stability, and 150 Ohms ESR in fundamental mode.

Q: What is the MSL rating for both parts?

A: Both parts have MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling.