Nexperia USA Inc. HPZR-C50X

Overview

HPZR-C50X from Nexperia is a high-power Zener voltage regulator diode in CFP3 (SOD123W) package, designed for precision DC voltage clamping and regulation in power supply rails and protection circuits. It delivers 4.1 W total power dissipation at Tsp = 75 °C, features ±5 % tolerance, operates at nominal 50 V working voltage (VZ = 47.8–52.8 V @ IZ = 1 mA), and supports up to 30 kV ESD immunity per IEC 61000-4-2 (contact discharge).

For engineers reviewing the HPZR-C50X datasheet, HPZR-C50X pinout, HPZR-C50X application, or HPZR-C50X equivalent, this device is selected for stable low-current regulation, transient overvoltage suppression, and reference voltage generation where thermal robustness and high ESD resilience are required in space-constrained SMD layouts.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled differential resistance (RZ = 43 Ω @ IZ = 20 mA) and low reverse leakage (IR ≤ 0.1 μA @ VR = 40 V). Its thermal design targets junction-to-solder-point resistance of 18 K/W, enabling efficient heat transfer through the cathode tab to PCB copper.

The device complies with IEC 60134 absolute maximum ratings, supports non-repetitive peak power dissipation up to 800 W (tp ≤ 100 µs), and maintains stable regulation across ambient temperatures from −55 °C to +150 °C with maximum junction temperature limited to 150 °C.

Key Specifications

Pinout & Package

HPZR-C50X uses a 2-terminal CFP3 (SOD123W) surface-mount plastic package with cathode-marked top-side bar. Thermal performance relies on soldering the cathode pad (Pin 1) to ≥1 cm² copper area for optimal heat extraction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Compared with BZX84-C51 and 1N5375B, HPZR-C50X uniquely balances high SMT-compatible power (4.1 W), industry-leading ESD immunity (30 kV), and precision regulation (±5 %, 43 Ω RZ) in a 2.6 mm × 1.7 mm footprint-making it optimal for modern compact, ruggedized 48–50 V systems.

Availability

HPZR-C50X is available at Aetrix Electronics and suitable for industrial power supply monitoring, automotive body control module clamping, medical sensor reference stability, and telecom DC-DC converter feedback requiring stable component supply and long-term manufacturability.

Supply support for HPZR-C50X 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 advanced packaging and automotive-qualified components.

The HPZR series was developed specifically for high-power, high-ESD SMD Zener regulation in next-generation industrial and automotive power systems-addressing demand for smaller footprints, higher thermal efficiency, and enhanced system-level surge resilience.

FAQ

What is the maximum continuous reverse current HPZR-C50X can sustain at 50 V?

HPZR-C50X is rated for 400 mA forward current (IF), but as a Zener diode, its continuous reverse current capability is determined by power dissipation limits. At 50 V, maximum sustainable reverse current is 82 mA (4100 mW ÷ 50 V), assuming Tsp = 75 °C and zero-lead-length thermal test conditions per datasheet Section 4.

Does HPZR-C50X require a heatsink for 4.1 W operation?

No external heatsink is required. The CFP3 package achieves 4.1 W dissipation at Tsp = 75 °C by transferring heat directly from the cathode tab to ≥1 cm² of tin-plated copper on FR4 PCB, as validated in thermal characterization Table 8 and Figure 9. Board layout-not heatsinks-is the critical thermal design factor.

How does the 30 kV ESD rating apply to real-world PCB layout?

The 30 kV rating applies to contact discharge at the cathode solder point (Table 6 footnote [2]). To retain this performance, the cathode pad must be routed with minimum trace length to the protected node, avoid sharp corners or vias near the pad, and maintain ≥0.5 mm clearance to adjacent conductors per IEC 61000-4-2 layout guidelines.

Can HPZR-C50X replace older 1N5375B in existing designs?

Direct replacement is possible only if the PCB footprint is updated to SOD123W and thermal copper area is increased to ≥1 cm². While both regulate ~50 V, HPZR-C50X offers 30 kV ESD immunity (vs. none for 1N5375B) and lower RZ (43 Ω vs. 2 Ω), but requires requalification of surge response due to different pulse power profile (800 W/100 µs vs. 5 W DC).