Nexperia USA Inc. HPZR-C35X

Overview

HPZR-C35X from Nexperia is a high-power Zener voltage regulator diode in CFP3 (SOD123W) package, designed for precision DC voltage clamping and regulation at 35 V nominal working voltage with ±5 % tolerance. It delivers 4.1 W total power dissipation at T_sp = 75 °C, supports 30 kV ESD protection per IEC 61000-4-2 (contact), and exhibits 30 Ω differential resistance at I_Z = 20 mA - enabling stable regulation in low-current industrial power rails.

For engineers reviewing the HPZR-C35X datasheet, HPZR-C35X pinout, HPZR-C35X application, or HPZR-C35X equivalent, this device serves as a thermally robust, surface-mount Zener solution for overvoltage protection, reference stabilization, and voltage translation in space-constrained PCB layouts where leadless thermal performance and high ESD immunity are critical.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified nominal Zener voltage of 35 V at I_Z = 20 mA, maintaining regulation across ambient temperatures from −55 °C to +150 °C and junction temperatures up to 150 °C. Its differential resistance of 30 Ω ensures minimal voltage drift under load variation, while its non-repetitive peak power dissipation reaches 800 W for pulses ≤100 µs.

The device uses a planar silicon process optimized for stable Zener characteristics and low leakage, with reverse current limited to 0.1 µA at V_R = 28.9 V (80 % of V_Z). Thermal resistance from junction to solder point is 18 K/W, enabling efficient heat transfer through the cathode tab to PCB copper when mounted on FR4 with 1 cm² cathode pad.

Key Specifications

Pinout & Package

HPZR-C35X is housed in a CFP3 (SOD123W) surface-mount plastic package measuring 2.6 mm × 1.7 mm × 1.0 mm, featuring a flat, low-profile profile with exposed cathode tab for enhanced thermal conduction. The marking bar on the top surface identifies the cathode terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C36 and 1N5365B, HPZR-C35X uniquely balances high power density (4.1 W in SMD), industry-leading ESD immunity (30 kV), and moderate dynamic impedance (30 Ω), making it optimal for automated production of thermally demanding yet ESD-sensitive industrial control boards.

Availability

HPZR-C35X is available at Aetrix Electronics and suitable for industrial sensor conditioning, PLC input protection, telecom line card references, and automotive body control modules requiring stable component supply, consistent parametric performance, and full traceability.

Supply support for HPZR-C35X 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.

The HPZR series belongs to Nexperia's high-power Zener regulator portfolio, engineered specifically for applications demanding robust voltage clamping in compact SMD formats with superior thermal and ESD resilience.

FAQ

What is the maximum continuous reverse current the HPZR-C35X can sustain without degradation?

The HPZR-C35X is rated for a maximum continuous forward current of 400 mA, but its Zener operation relies on controlled reverse bias. At its rated 35 V nominal voltage and 20 mA test current, it maintains stable regulation with ≤0.1 µA reverse leakage at 28.9 V. Sustained reverse current beyond 200 mA requires derating per the thermal curve in Figure 9, as junction temperature must remain ≤150 °C.

How does the CFP3 (SOD123W) package improve thermal performance over standard SOD-123?

The CFP3 package features an enlarged cathode tab with optimized thermal pad geometry (1 cm² recommended), achieving 18 K/W junction-to-solder-point thermal resistance - 35 % lower than standard SOD-123. This allows 4.1 W dissipation at T_sp = 75 °C versus ~1.5 W for conventional SOD-123, verified by Nexperia's thermal characterization in Table 8.

Can HPZR-C35X replace a 1N5365B in an existing design without layout changes?

No - HPZR-C35X uses CFP3 (SOD123W) surface-mount footprint (2.6 mm × 1.7 mm), while 1N5365B is DO-15 through-hole (4.5 mm × 2.5 mm). Direct replacement requires PCB redesign, stencil update, and reflow profile adjustment. However, its 35 V/4.1 W specification closely matches 1N5365B's 36 V/5 W, offering superior ESD immunity and smaller form factor.

What is the significance of the "X" suffix in HPZR-C35X?

The "X" in HPZR-C35X denotes Nexperia's standard ordering suffix for tape-and-reel packaging (10,000 units per reel), per Table 3. It carries no electrical or parametric difference from HPZR-C35 - both share identical Zener voltage (33.3–36.8 V), differential resistance (30 Ω), and thermal specifications. The base part number HPZR-C35 identifies the 35 V variant within the HPZR series.