ECQ-P1H121JZ Equivalent & Substitute Parts

Part Overview

The ECQ-P1H121JZ is a 120 pF film capacitor manufactured by Panasonic Electronic Components, rated for 50V DC operation with ±5% tolerance. This radial through-hole component uses polypropylene (PP) dielectric material and is designed for high-frequency and switching applications. The part is currently obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

ECQ-P1H121JZ

Panasonic Electronic ComponentsIn Stock: 704ECQ-P1H121JZ Datasheet

Current PartRFQ

ECH-U1H121JX5

Panasonic Electronic ComponentsIn Stock: 3595ECH-U1H121JX5 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ECQ-P1H121JZ is determined by the following critical parameters:

• Capacitance Value: 120 pF (exact match required)
• Tolerance: ±5% (acceptable range for equivalent function)
• Voltage Rating (DC): Minimum 50V (equal or higher ratings are acceptable)
• Dielectric Material: Film-based dielectric (polypropylene or equivalent film technology)
• Operating Temperature Range: Must support the application's thermal requirements

The ECH-U1H121JX5 qualifies as a functional equivalent based on matching capacitance, tolerance, and voltage rating specifications. However, this substitute introduces a change in mounting technology (surface mount 0805 vs. through-hole radial) and dielectric material (polyphenylene sulfide vs. polypropylene), which may require circuit board redesign and thermal management evaluation.

Parameter Comparison

Engineering Selection Recommendations

The ECH-U1H121JX5 provides electrical equivalence in capacitance, tolerance, and DC voltage rating. The substitute part carries active product status and ROHS3 compliance, supporting long-term supply chain availability and regulatory requirements.

Selection of this substitute requires evaluation of the following factors:

• Mounting Technology Change: Transition from through-hole radial to surface-mount 0805 requires circuit board redesign and assembly process modification.
• Dielectric Material Difference: Polyphenylene sulfide (PPS) metallized film offers extended operating temperature range (-55°C ~ 125°C vs. -40°C ~ 85°C) and improved thermal stability compared to polypropylene.
• AC Voltage Rating: The substitute specifies 30V AC rating, whereas the original part does not specify AC operation. Confirm AC voltage requirements in the application circuit.
• Moisture Sensitivity: MSL rating of 1 (unlimited) indicates minimal moisture sensitivity, suitable for standard storage and handling conditions.

Frequently Asked Questions (FAQ)

Q: Can the ECH-U1H121JX5 be used as a direct replacement for the ECQ-P1H121JZ?

A: Electrical substitution is possible based on matching capacitance (120 pF), tolerance (±5%), and DC voltage rating (50V). However, physical substitution requires circuit board redesign due to the change from through-hole radial to surface-mount 0805 mounting.

Q: What is the primary difference between these two parts?

A: The main differences are mounting technology (through-hole vs. surface-mount), dielectric material (polypropylene vs. polyphenylene sulfide), and operating temperature range. The substitute offers a wider temperature range and active product status.

Q: Is the ECH-U1H121JX5 suitable for high-frequency and switching applications?

A: The substitute part is classified for general-purpose applications. Confirm that the polyphenylene sulfide dielectric material and metallized-stacked construction meet the specific high-frequency and switching performance requirements of the original application.

Q: What is the lead spacing difference between these parts?

A: The ECQ-P1H121JZ has a lead spacing of 0.197" (5.00mm) for through-hole mounting. The ECH-U1H121JX5 uses surface-mount solder pads with no discrete lead spacing specification, as it is designed for PCB pad attachment.

Q: Are there additional substitute options available?

A: The ECH-U1H121JX5 documentation references additional substitutes: ECH-U1H121GB5 and ECH-U1H121GX5. These alternatives should be evaluated using the same parameter comparison methodology.