Nexperia USA Inc. PMEG4005EJ-QX

Overview

PMEG4005EJ-QX from Nexperia is a 40 V, 0.5 A planar MEGA Schottky barrier rectifier in SOD323F (SC-90) package, featuring 420–470 mV forward voltage at 500 mA, qualified to AEC-Q101 for automotive use, and optimized for low-voltage rectification and reverse polarity protection in space-constrained DC/DC converters.

For engineers reviewing the PMEG4005EJ-QX datasheet, PMEG4005EJ-QX pinout, PMEG4005EJ-QX application, or PMEG4005EJ-QX equivalent, key selection criteria include its ultra-low VF, AEC-Q101 qualification, thermal resistance (Rth(j-sp) = 55 K/W), 10 A non-repetitive peak forward current, and cathode-marked SOD323F footprint compatibility with high-density PCB layouts.

Technical Context

This Schottky rectifier uses a planar MEGA structure with integrated guard ring for enhanced stress protection and thermal stability. Its low VF stems from optimized metal-semiconductor junction design, enabling efficient operation at ambient temperatures up to 150 °C and junction temperatures up to 150 °C.

The device exhibits 7–20 µA reverse leakage at 10 V and 30–100 µA at 40 V, with 43–50 pF capacitance at 1 V/1 MHz - characteristics critical for minimizing switching losses and EMI in high-frequency SMPS and battery protection circuits.

Key Specifications

Pinout & Package

Encapsulated in SOD323F (SC-90), a 1.7 mm × 1.25 mm × 0.7 mm surface-mount plastic package with flat leads and cathode-marked bar.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSR0540HT1G and SS14-E3/5AT, PMEG4005EJ-QX delivers the lowest VF in the smallest AEC-Q101-qualified footprint, making it optimal for automotive and portable electronics where board area, thermal performance, and efficiency are co-constrained.

Availability

PMEG4005EJ-QX is available at Aetrix Electronics and suitable for automotive body control modules, USB-C power delivery input protection, and industrial IoT sensor node power path designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PMEG4005EJ-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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

PMEG4005EJ-QX belongs to Nexperia's MEGA Schottky rectifier product line, engineered specifically for ultra-low VF and AEC-Q101 compliance in space- and power-constrained automotive and portable power applications.

FAQ

What is the maximum continuous forward current for PMEG4005EJ-QX at 85 °C ambient?

The datasheet specifies 0.5 A continuous forward current only at Tsp ≤ 55 °C. At 85 °C ambient, derating applies: using Rth(j-sp) = 55 K/W and Tj(max) = 150 °C, maximum IF drops to approximately 0.32 A to maintain junction temperature within limit. Full derating curve is provided in Figure 1 of the official datasheet.

Is PMEG4005EJ-QX suitable for synchronous rectification in a 500 kHz flyback converter?

No - PMEG4005EJ-QX is a passive Schottky rectifier, not a synchronous rectifier IC. It can serve as secondary-side rectification in flyback topologies, but requires no gate drive. Its 43–50 pF capacitance and fast recovery (<10 ns) support operation up to 1 MHz, making it viable for 500 kHz designs where simplicity and cost outweigh efficiency gains from active synchronous control.

How does the integrated guard ring improve reliability in automotive environments?

The guard ring mitigates edge breakdown under high dv/dt transients (e.g., load dump pulses) by distributing electric field stress away from the active junction periphery. In AEC-Q101 testing, this structure enabled pass-level performance in HTRB (1000 h @ 150 °C) and temperature cycling (-40 °C to +125 °C), directly enhancing long-term robustness in engine bay and chassis-mounted modules.

Can PMEG4005EJ-QX replace a 1N5817 in an existing design?

Yes, with caveats: both are 40 V/1 A Schottkys, but PMEG4005EJ-QX is rated 0.5 A continuous (not 1 A) and uses SOD323F (vs. DO-204AL). Electrical replacement is valid only if peak current stays ≤0.5 A and thermal design accommodates the smaller package. The lower VF (470 mV vs. ~600 mV) improves efficiency, but layout must be updated for the 1.7 mm × 1.25 mm footprint.