ECS-40.3-S-4 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-40.3-S-4 is a 4.032 MHz through-hole crystal oscillator in HC-49/US package configuration. This active product is designed for fundamental mode operation across industrial temperature ranges (-10°C to 70°C). The part is currently in stock with 1054 units available. Substitute parts are identified when inventory constraints, compliance requirements, or specific application needs necessitate alternative sourcing while maintaining electrical and mechanical compatibility.

Substiute Parts

ECS-40.3-S-4

ECS Inc.In Stock: 1133ECS-40.3-S-4 Datasheet

Current PartRFQ

ECS-40.3-S-4X

ECS Inc.In Stock: 947ECS-40.3-S-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-40.3-S-4 is determined by strict equivalence across the following critical parameters:

• Frequency: 4.032 MHz (exact match required)
• Frequency Tolerance: ±30ppm (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-40.3-S-4X qualifies as a parametric equivalent substitute, meeting all electrical and mechanical specifications while offering improved compliance status.

Parameter Comparison

Engineering Selection Recommendations

Both ECS-40.3-S-4 and ECS-40.3-S-4X are active products with identical electrical and mechanical specifications. Selection between these parts should be based on compliance requirements and inventory availability:

The ECS-40.3-S-4X is ROHS3 compliant, making it the appropriate choice for applications subject to RoHS directives or customer specifications requiring RoHS compliance. The ECS-40.3-S-4 is RoHS non-compliant and suitable for legacy systems or applications without RoHS requirements. Both parts maintain REACH Unaffected status and identical export classification (EAR99). Inventory levels support either selection, with the ECS-40.3-S-4 offering higher stock availability (1054 units versus 917 units).

Frequently Asked Questions (FAQ)

Q: Can ECS-40.3-S-4X replace ECS-40.3-S-4 in existing designs?

A: Yes. The ECS-40.3-S-4X is a direct parametric equivalent with identical frequency (4.032 MHz), tolerance (±30ppm), ESR (150 Ohms), package (HC-49/US), and operating temperature range (-10°C to 70°C). No circuit modifications are required.

Q: What is the primary difference between these parts?

A: The ECS-40.3-S-4X is ROHS3 compliant, while the ECS-40.3-S-4 is RoHS non-compliant. All electrical and mechanical parameters are identical.

Q: Are there any package or mounting differences?

A: No. Both parts use 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 (0.138" / 4.60mm).

Q: Which part should be selected for new designs?

A: Selection depends on compliance requirements. For designs requiring RoHS compliance, specify ECS-40.3-S-4X. For applications without RoHS requirements, either part is acceptable based on inventory and cost considerations.

Q: Are both parts currently available?

A: Yes. ECS-40.3-S-4 has 1054 units in stock, and ECS-40.3-S-4X has 917 units in stock.