ECS-73-S-1 7.3728 MHz Crystal Equivalent & Substitute Parts

Part Overview

The ECS-73-S-1 is a 7.3728 MHz through-hole crystal oscillator in HC-49/U package with 40 Ohms equivalent series resistance (ESR) and ±30ppm frequency tolerance. This part carries a "Not For New Designs" status, making identification of active equivalent alternatives essential for ongoing production and new circuit implementations. Substitute parts must maintain identical electrical specifications and mechanical compatibility to ensure direct circuit board replacement without redesign.

Substiute Parts

ECS-73-S-1

ECS Inc.In Stock: 1102ECS-73-S-1 Datasheet

Current PartRFQ

ECS-73-S-1X

ECS Inc.In Stock: 1157ECS-73-S-1X Datasheet

Parametric EquivalentRFQ

MP073

CTS-Frequency ControlsIn Stock: 1499MP073 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following critical parameters:

• Frequency: 7.3728 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• ESR: 40 Ohms (exact match required)
• Package / Case: HC-49/U (exact match required)
• Mounting Type: Through Hole (exact match required)
• Load Capacitance: Series (exact match required)
• Operating Mode: Fundamental (exact match required)

Two substitute parts meet these criteria: ECS-73-S-1X (parametric equivalent from ECS Inc.) and MP073 (direct manufacturer equivalent from CTS-Frequency Controls). Both maintain identical electrical performance and mechanical form factor compatibility.

Parameter Comparison

Engineering Selection Recommendations

ECS-73-S-1X is the primary substitute for new designs and ongoing production. This part is manufactured by the original supplier (ECS Inc.), carries Active product status, and achieves ROHS3 compliance. The identical frequency, tolerance, ESR, and package specifications ensure direct circuit board compatibility without modification.

MP073 from CTS-Frequency Controls provides an alternative cross-manufacturer substitute with identical electrical performance and Active status. This part offers an extended operating temperature range (-20°C ~ 70°C versus -10°C ~ 70°C), providing additional thermal margin in applications requiring lower temperature operation. Physical dimensions differ slightly (0.427" L x 0.150" W versus 0.447" L x 0.183" W), requiring verification of available board space in confined layouts. MP073 also achieves ROHS3 compliance.

The original ECS-73-S-1 should not be selected for new designs due to its "Not For New Designs" status and RoHS non-compliance. Existing inventory of ECS-73-S-1 may be used for legacy system maintenance where compliance requirements do not apply.

Frequently Asked Questions (FAQ)

Q: Can ECS-73-S-1X be used as a direct replacement for ECS-73-S-1 without circuit modification?

A: Yes. ECS-73-S-1X maintains identical frequency (7.3728 MHz), frequency tolerance (±30ppm), ESR (40 Ohms), load capacitance (Series), operating mode (Fundamental), and HC-49/U package specifications. No circuit redesign is required.

Q: What is the difference between ECS-73-S-1X and MP073?

A: Both parts meet all critical electrical specifications. ECS-73-S-1X is manufactured by ECS Inc. (original supplier). MP073 is manufactured by CTS-Frequency Controls and offers an extended operating temperature range (-20°C ~ 70°C). Physical dimensions differ slightly: ECS-73-S-1X measures 0.447" L x 0.183" W; MP073 measures 0.427" L x 0.150" W. Both achieve ROHS3 compliance and carry Active product status.

Q: Why is the original ECS-73-S-1 marked "Not For New Designs"?

A: This designation indicates the part is obsolete or being phased out by the manufacturer. ECS-73-S-1X is the recommended active replacement from the same manufacturer.

Q: Are there any physical compatibility concerns with MP073 due to its smaller dimensions?

A: MP073 has a smaller footprint (0.427" L x 0.150" W versus 0.447" L x 0.183" W). Verify available board space and mounting hole alignment before selection. Height (0.530" maximum) remains identical across all three parts.

Q: Do all three parts have the same moisture sensitivity requirements?

A: Yes. All three parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Which substitute should be selected for new product designs?

A: ECS-73-S-1X is the recommended choice for new designs. It is manufactured by the original supplier, carries Active product status, and achieves ROHS3 compliance. MP073 is an acceptable alternative if extended temperature range (-20°C ~ 70°C) is required and physical dimensions are verified as compatible.