IP4386CX4/P,315 Equivalent & Substitute Parts

Part Overview

The IP4386CX4/P,315 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Nexperia USA Inc., designed for general-purpose transient protection applications. This component features a 14V reverse standoff voltage with a 20V maximum clamping voltage and 28A peak pulse current capability in a compact 4-WLCSP surface mount package. The product is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and procurement needs.

Substiute Parts

IP4386CX4/P,315

Nexperia USA Inc.In Stock: 812IP4386CX4/P,315 Datasheet

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LFTVS18-1F3

STMicroelectronicsIn Stock: 24392LFTVS18-1F3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the IP4386CX4/P,315 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Unidirectional channel configuration (1 channel required)
• Reverse standoff voltage range: 12V to 14V
• Breakdown voltage minimum: 16V
• Clamping voltage maximum: 19V to 20V
• Peak pulse current capability: minimum 5A (lower current ratings acceptable for reduced transient energy applications)
• Operating temperature range: -35°C to 85°C or broader

Mechanical Compatibility Criteria:

• Surface mount package type (4-pin ball grid array or flip chip configurations)
• Package footprint: 0.77mm to 0.91mm dimensions (compatible with PCB layout constraints)
• RoHS3 compliance and MSL Level 1 rating

The LFTVS18-1F3 from STMicroelectronics meets these substitution criteria with compatible voltage ratings, surface mount configuration, and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The LFTVS18-1F3 serves as a functional substitute for the obsolete IP4386CX4/P,315 based on the following engineering criteria:

Regulatory and Compliance Alignment: Both components maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with current manufacturing and environmental standards.

Product Status Advantage: The LFTVS18-1F3 carries active product status from STMicroelectronics, providing long-term availability and supply chain stability compared to the obsolete IP4386CX4/P,315.

Electrical Parameter Compatibility: The substitute part operates within the same voltage protection window (16V breakdown, 19V clamping) with a 2V differential in reverse standoff voltage (12V vs. 14V). This variance remains within acceptable tolerance for general-purpose transient suppression applications.

Current Rating Consideration: The LFTVS18-1F3 provides 5A peak pulse current compared to the original 28A specification. This represents a reduced transient energy handling capacity. Selection of this substitute is appropriate for applications where transient pulse energy does not exceed the 5A capability threshold.

Package Footprint Compatibility: Both components utilize 4-pin surface mount ball grid array configurations with compatible footprint dimensions (0.77mm to 0.91mm), permitting direct PCB layout substitution without redesign.

Frequently Asked Questions (FAQ)

Q: Can the LFTVS18-1F3 directly replace the IP4386CX4/P,315 in all applications?

A: Direct substitution is appropriate for applications where the transient pulse current does not exceed 5A. The original component rated at 28A peak pulse current provides higher transient energy absorption. Applications requiring the full 28A capability require alternative components with equivalent current ratings.

Q: What is the significance of the 2V difference in reverse standoff voltage (14V vs. 12V)?

A: The reverse standoff voltage determines the threshold at which the TVS diode begins conducting. The LFTVS18-1F3 at 12V will activate at a lower voltage than the original 14V specification. For circuits with tight voltage margins, this difference may affect circuit behavior. Both components share the same 16V minimum breakdown voltage, maintaining the upper protection threshold.

Q: Are the package dimensions interchangeable?

A: Both components use 4-pin surface mount ball grid array packages with compatible footprints. The LFTVS18-1F3 (0.77x0.77mm) is slightly smaller than the IP4386CX4/P,315 (0.91x0.91mm), but both fit within standard PCB layout tolerances for this package class. No PCB redesign is required.

Q: What is the impact of the 15pF capacitance difference?

A: The LFTVS18-1F3 exhibits 175pF capacitance at 1MHz compared to 160pF for the original component. This 15pF increase may introduce minor signal integrity effects in high-frequency applications. For general-purpose transient suppression, this difference is negligible.

Q: Why is the operating temperature range not specified for the LFTVS18-1F3?

A: The substitute part datasheet does not provide explicit operating temperature range information in the available parameters. The original component specifies -35°C to 85°C operation. Consultation of the complete LFTVS18-1F3 datasheet is necessary to confirm temperature operating limits for temperature-critical applications.

Q: Does the active product status of the LFTVS18-1F3 provide supply advantages?

A: Yes. Active product status indicates ongoing manufacturing and distribution support from STMicroelectronics. The obsolete status of the IP4386CX4/P,315 limits future availability to existing inventory. The LFTVS18-1F3 provides long-term procurement reliability and supply chain continuity.