LMK107F474ZAST Equivalent & Substitute Parts

Part Overview

The LMK107F474ZAST is a 0.47 µF ceramic capacitor manufactured by Taiyo Yuden, rated for 10V operation with Y5V temperature coefficient characteristics. This component is classified as obsolete, indicating discontinuation from the manufacturer. The Y5V dielectric formulation provides a capacitance range of -20%, +80% across the operating temperature span of -30°C to 85°C, making it suitable for general-purpose applications where wide capacitance tolerance is acceptable. Identification of equivalent substitute parts is necessary due to the obsolete product status and potential supply chain constraints.

Substiute Parts

LMK107F474ZAST

Taiyo YudenIn Stock: 795LMK107F474ZAST Datasheet

Current PartRFQ

LMK107BJ474KAST

Taiyo YudenIn Stock: 824LMK107BJ474KAST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LMK107F474ZAST is determined by strict alignment of electrical and mechanical parameters. The following criteria establish substitution validity:

Mandatory Matching Parameters:

• Capacitance value: 0.47 µF (exact match required)
• Voltage rating: 10V minimum
• Package designation: 0603 (1608 Metric)
• Mounting type: Surface Mount, MLCC

Compatible Parameter Variations:

• Temperature coefficient: Alternative dielectric formulations (X5R, X7R) are acceptable when operating temperature range requirements are met
• Tolerance: Tighter tolerance specifications (±10%) are acceptable substitutes for wider tolerance ranges (-20%, +80%)
• Operating temperature: Extended ranges (-55°C ~ 85°C) are acceptable for applications requiring -30°C ~ 85°C operation

The LMK107BJ474KAST qualifies as a direct substitute based on matching capacitance, voltage rating, and package specifications. The X5R temperature coefficient provides superior capacitance stability compared to Y5V, with an extended lower operating temperature limit and tighter tolerance specification.

Parameter Comparison

Engineering Selection Recommendations

The LMK107BJ474KAST is a qualified substitute for the obsolete LMK107F474ZAST based on the following engineering criteria:

Electrical Compatibility: The substitute maintains identical capacitance (0.47 µF) and voltage rating (10V), ensuring circuit-level electrical performance equivalence. The X5R temperature coefficient provides superior capacitance stability across temperature variations compared to the Y5V formulation of the original part. The tighter tolerance specification (±10% versus -20%, +80%) reduces capacitance variation in production and across operating conditions.

Physical Compatibility: Both components share identical package designation (0603/1608 Metric), physical dimensions (0.063" L x 0.031" W), and thickness (0.035" maximum). Surface mount assembly processes require no modification.

Compliance and Availability: The LMK107BJ474KAST carries Active product status, ensuring current manufacturing availability and supply chain continuity. Both components maintain identical Moisture Sensitivity Level (MSL 1) and ECCN/HTSUS classifications. The substitute is RoHS3 compliant, meeting current regulatory requirements.

Application Scope: While the original part is designated for general-purpose applications, the substitute is specified for SMPS (Switched-Mode Power Supply) filtering, indicating suitability for more demanding switching applications. This expanded application scope does not restrict use in general-purpose circuits.

Frequently Asked Questions (FAQ)

Q: Can the LMK107BJ474KAST directly replace the LMK107F474ZAST on existing PCBs?

A: Yes. Both components use identical 0603 (1608 Metric) package specifications with matching physical dimensions and thickness. No PCB layout modifications are required. Assembly processes remain unchanged.

Q: What is the primary difference between Y5V and X5R temperature coefficients?

A: Y5V dielectric exhibits capacitance variation of -20%, +80% across the operating temperature range (-30°C to 85°C). X5R dielectric provides tighter capacitance stability with ±15% variation across a wider temperature range (-55°C to 85°C). X5R formulation is preferred for applications requiring predictable capacitance performance across temperature extremes.

Q: Does the tighter tolerance of the substitute (±10% versus -20%, +80%) affect circuit design?

A: The substitute's tighter tolerance reduces capacitance variation in production and across operating conditions. For circuits designed to accommodate the original part's wide tolerance range, the substitute provides improved performance consistency. No circuit redesign is necessary.

Q: Is the extended operating temperature range (-55°C to 85°C) of the substitute a concern?

A: No. Extended operating temperature ranges are backward compatible with applications requiring narrower ranges. The substitute operates within the original part's temperature specification (-30°C to 85°C) and provides additional capability for lower temperature environments.

Q: Are there any compliance or regulatory differences between the two parts?

A: Both components share identical ECCN (EAR99) and HTSUS (8532.24.0020) classifications. The substitute carries RoHS3 compliance certification, meeting current regulatory requirements. No compliance barriers exist for substitution.

Q: What inventory status should be considered when selecting between these parts?

A: The LMK107F474ZAST (obsolete status) has 764 pieces in stock. The LMK107BJ474KAST (active status) has 715 pieces in stock. Active product status ensures long-term availability and future replenishment capability, making it the preferred selection for new designs and ongoing production.