US3840005Z Crystal Equivalent & Substitute Parts

Part Overview

The US3840005Z is a 38.4 MHz fundamental mode crystal manufactured by Diodes Incorporated, designed for surface mount applications in compact form factors. This part is actively produced and widely used in timing-critical applications requiring precise frequency stability. Substitute parts may be required due to inventory constraints, supply chain considerations, or specific application requirements within the allowable parameter ranges.

Substiute Parts

US3840005Z

Diodes IncorporatedIn Stock: 1010US3840005Z Datasheet

Current PartRFQ

ECS-384-8-48-CKY-TR

ECS Inc.In Stock: 5073ECS-384-8-48-CKY-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the US3840005Z is permissible with parts meeting the following criteria:

• Identical frequency: 38.4 MHz
• Matching frequency stability: ±10ppm
• Compatible operating temperature range: -30°C to 85°C
• Identical operating mode: Fundamental
• Identical package type: 4-SMD, No Lead
• Surface mount mounting type
• ROHS3 compliance maintained
• MSL rating of 1 or better

The ECS-384-8-48-CKY-TR meets these substitution criteria. Variations in load capacitance (10pF vs. 8pF) and ESR (60 Ohms vs. 100 Ohms) fall within acceptable ranges for this crystal category and do not prevent functional substitution in standard applications.

Parameter Comparison

Engineering Selection Recommendations

Both the US3840005Z and ECS-384-8-48-CKY-TR are active production parts with full ROHS3 compliance and unlimited moisture sensitivity ratings. Selection between these parts should be based on:

• Circuit design load capacitance requirements (10pF vs. 8pF)
• PCB layout constraints, as the ECS part features a smaller footprint (1.20mm x 1.00mm vs. 1.60mm x 1.20mm)
• ESR tolerance specifications for the application (60 Ohms vs. 100 Ohms)
• Inventory availability and supply chain lead times

Both parts maintain identical frequency stability and operating temperature specifications, ensuring functional compatibility in applications designed for the 38.4 MHz fundamental mode crystal category.

Frequently Asked Questions (FAQ)

Q: Can the ECS-384-8-48-CKY-TR directly replace the US3840005Z without circuit modifications?

A: Direct replacement is possible in most applications. However, the difference in load capacitance (8pF vs. 10pF) may require circuit tuning adjustments. Verify that your oscillator circuit design accommodates the 8pF load capacitance specification.

Q: What is the significance of the ESR difference between these parts?

A: The US3840005Z has 60 Ohms ESR while the ECS part has 100 Ohms ESR. Both values are within acceptable ranges for 38.4 MHz crystals. Higher ESR may result in slightly increased power consumption in the oscillator circuit but does not affect frequency stability or accuracy.

Q: Are the physical size differences important for PCB layout?

A: The ECS-384-8-48-CKY-TR is smaller (1.20mm x 1.00mm vs. 1.60mm x 1.20mm). If your PCB layout is constrained, the smaller footprint may be advantageous. Verify that your PCB design can accommodate the smaller package dimensions.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant, carry MSL rating 1 (unlimited moisture sensitivity), and are classified under the same HTSUS code (8541.60.0060).

Q: What is the operating temperature range for both parts?

A: Both the US3840005Z and ECS-384-8-48-CKY-TR operate across -30°C to 85°C with ±10ppm frequency stability maintained throughout this range.