NXP Semiconductors IP4085CX4/LF,135

Overview

IP4085CX4/LF,135 from Nexperia is a single-channel integrated ESD protection diode in a 2×2 Wafer Level Chip-Scale Package (WLCSP) with 0.5 mm pitch, rated for ±30 kV contact discharge (IEC 61000-4-2), 60 A peak pulse current (IEC 61000-4-5), and 14 V reverse standoff voltage - deployed for polarity reversal and surge protection on USB/charger interfaces in portable electronics.

For engineers reviewing the IP4085CX4/LF,135 datasheet, IP4085CX4/LF,135 pinout, IP4085CX4/LF,135 application, or IP4085CX4/LF,135 equivalent, this device delivers high-surge immunity in ultra-compact WLCSP packaging with verified clamping performance under DC forward bias and transient 8/20 µs pulses - critical for space-constrained mobile handset and wireless data system designs.

Technical Context

The IP4085CX4/LF,135 integrates one high-performance bidirectional ESD protection diode with anode and cathode each connected to two solder balls (A1/A2 and B1/B2), enabling low-inductance grounding via micro-via PCB layout. Its architecture supports simultaneous overvoltage and wrong-polarity protection without external components.

It operates across −30 °C to +85 °C ambient, with thermal resistance of 130 K/W on a 2-layer PCB and peak reflow tolerance up to 260 °C. Clamping behavior is characterized for both forward and reverse current pulses per IEC 61000-4-5, with guaranteed V_CL ≤20 V at 60 A surge.

Key Specifications

Pinout & Package

IP4085CX4/LF,135 uses a 2×2 Wafer Level Chip-Scale Package (WLCSP4) with 0.5 mm pitch, measuring 0.91 mm × 0.91 mm × 0.65 mm. Solder balls are arranged in a square grid with index area marking orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ESD protection applications.

Compared with IP4085CX4/LF,135, IP4385CX4/LF offers tighter voltage clamping at lower operating voltages but sacrifices surge margin and polarity protection headroom, while TPD4E001DPYR provides superior high-speed signal integrity at the cost of standalone DC fault protection - making IP4085CX4/LF,135 uniquely balanced for compact, dual-role (ESD + polarity) protection in 12 V charging paths.

Availability

IP4085CX4/LF,135 is available at Aetrix Electronics and suitable for mobile handset design, portable medical device development, and wireless data system integration requiring stable component supply and long-term lifecycle continuity.

Supply support for IP4085CX4/LF,135 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division - focused on high-volume, high-reliability components for automotive, industrial, computing, and consumer markets.

The IP4085CX4/LF,135 belongs to Nexperia's integrated ESD protection diode family, engineered specifically for space-constrained, high-surge environments in portable electronics where simultaneous ESD immunity and DC polarity fault tolerance are mandatory.

FAQ

What is the maximum continuous operating voltage for IP4085CX4/LF,135?

The IP4085CX4/LF,135 has a reverse standoff voltage (VRWM) of +14 V, meaning it can continuously block up to 14 V in reverse bias without conduction. This rating applies across the full operating ambient range (−30 °C to +85 °C) and is validated per IEC 60134 absolute maximum ratings. Operation above 14 V risks premature breakdown and irreversible degradation of the IP4085CX4/LF,135.

Does IP4085CX4/LF,135 provide protection against both ESD and power supply polarity reversal?

Yes, the IP4085CX4/LF,135 delivers dual-function protection: it suppresses ±30 kV ESD transients per IEC 61000-4-2 and clamps reverse-polarity faults to ≤1.3 V at 850 mA forward current. Its internal structure - with separate anode and cathode terminals each bonded to two solder balls - enables low-impedance conduction paths for both surge energy dissipation and DC fault current routing, making the IP4085CX4/LF,135 suitable for charger interface protection where both threats coexist.

What PCB layout practices maximize ESD performance of IP4085CX4/LF,135?

To maximize ESD performance, use Non-Solder Mask Defined (NSMD) pads with 200 µm diameter, connect each cathode ball (A1/A2) directly to an internal ground plane via 100 µm laser-drilled micro-vias, and maintain uninterrupted copper pour beneath the IP4085CX4/LF,135 footprint. Avoid thermal relief spokes and ensure ≥0.3 mm clearance from adjacent signal traces - these practices reduce ground inductance below 0.3 nH, enabling the IP4085CX4/LF,135 to respond within 100 ps to fast-rising ESD events.

Is IP4085CX4/LF,135 compatible with standard Pb-free reflow profiles?

Yes, the IP4085CX4/LF,135 is qualified for Pb-free reflow with a peak temperature of 260 °C (≤10 s), matching JEDEC J-STD-020D.1 requirements. It withstands at least three reflow cycles using the profile shown in Figure 18 of its datasheet - including soak (60–180 s at 150–200 °C), ramp (2.5–4.0 °C/s), and controlled cooling (≤−6 °C/s). The IP4085CX4/LF,135 remains fully functional after exposure to this thermal stress.

How does the clamping voltage of IP4085CX4/LF,135 behave under surge conditions?

The IP4085CX4/LF,135 clamps to ≤20 V at 60 A peak pulse current (8/20 µs waveform, IEC 61000-4-5), measured at Tamb ≤85 °C. This clamping level is stable across temperature: Figure 13 shows V_CL remains 16–19 V from −30 °C to +85 °C under reverse current surge. The IP4085CX4/LF,135 achieves this via low-dynamic-resistance silicon design, ensuring downstream ICs see no more than 20 V during worst-case surge events.