Nexperia USA Inc. PMEG4002EJ-QX

Overview

PMEG4002EJ-QX from Nexperia is a planar Schottky barrier rectifier with integrated guard ring for stress protection, designed for low-voltage, high-efficiency DC-to-DC conversion and reverse polarity protection in automotive power rails. It delivers 200 mA average forward current at 40 V reverse voltage, with a typical forward voltage of 520 mV at 200 mA and 25 °C, enabling ultra-low conduction loss in space-constrained SMD applications.

For engineers reviewing the PMEG4002EJ-QX datasheet, PMEG4002EJ-QX pinout, PMEG4002EJ-QX application, or PMEG4002EJ-QX equivalent, key selection criteria include its AEC-Q101 qualification, 520–600 mV VF at 200 mA, <10 µA IR at 40 V, 5 ns trr, and SOD323F (SC-90) package thermal performance on FR4 and ceramic PCBs.

Technical Context

This Schottky diode uses a planar junction structure with an integrated guard ring to suppress edge breakdown and improve reliability under transient stress-critical for automotive 12 V/24 V battery-connected circuits. Its low VF and ultra-fast 5 ns reverse recovery time minimize switching losses in high-frequency SMPS topologies operating up to several MHz.

The device is optimized for reflow soldering only and exhibits distinct thermal behavior depending on PCB substrate: Rth(j-a) ranges from 120 K/W (ceramic Al₂O₃) to 325 K/W (standard FR4), directly impacting derating curves for IF(AV) across ambient temperatures from −55 °C to 150 °C.

Key Specifications

Pinout & Package

Encapsulated in a SOD323F (SC-90) surface-mount plastic package measuring 1.7 mm × 1.25 mm × 0.7 mm, this two-terminal device features flat leads optimized for automated placement and reflow soldering on high-density PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Compared with RB520S-40T1G and NSR0240HT1G, PMEG4002EJ-QX provides superior automotive qualification, integrated guard ring robustness, and better thermal management on ceramic substrates-making it the preferred choice for mission-critical 12 V/24 V power rails requiring long-term reliability.

Availability

PMEG4002EJ-QX is available at Aetrix Electronics and suitable for automotive body control modules, USB-C power delivery clamps, and industrial sensor node power supplies requiring stable component supply with full AEC-Q101 traceability and lot-level documentation.

Supply support for PMEG4002EJ-QX 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 semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.

This part belongs to Nexperia's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for low-VF, high-speed power management in automotive and industrial embedded systems where efficiency, size, and stress resilience are critical.

FAQ

Is PMEG4002EJ-QX suitable for reflow-only assembly?

Yes-Nexperia specifies reflow soldering as the sole recommended process. Wave soldering and hand soldering are not qualified and may compromise the guard ring integrity or thermal performance. The device supports JEDEC J-STD-020 moisture sensitivity level 1 and withstands peak reflow temperatures up to 260 °C for 30 seconds.

What is the maximum allowable ambient temperature for 200 mA DC operation?

On a standard FR4 PCB with single-sided copper, the maximum ambient temperature for 200 mA DC operation is 105 °C (per Fig. 9, δ = 1 curve). On ceramic Al₂O₃ PCB, it rises to 130 °C (Fig. 11). Derating is required above these points to maintain Tj ≤ 150 °C.

Does the guard ring affect electrical parameters like VF or IR?

No-the guard ring is a structural feature that does not alter forward conduction or reverse leakage characteristics. Its function is purely mechanical/electrical field control: it redistributes electric field lines at the die edge to prevent premature avalanche, thereby improving VR consistency and long-term reliability under surge conditions.

Can PMEG4002EJ-QX replace standard PN diodes in existing 5 V SMPS designs?

Yes-with verified benefits: replacing a 1N4148 or 1N4007 reduces VF by 300–500 mV, cutting conduction loss by >60% at 100 mA and lowering junction temperature rise by ~15 °C. However, layout must accommodate the SOD323F footprint and ensure adequate cathode copper area for thermal dissipation.