Nexperia USA Inc. HPZR-C33X

Overview

HPZR-C33X from Nexperia is a high-power Zener voltage regulator diode in CFP3 (SOD123W) package, designed for precision DC voltage clamping and regulation at 33 V nominal working voltage with ±5 % tolerance. It delivers 4.1 W total power dissipation at T_sp = 75 °C (zero lead length), supports 800 W non-repetitive peak power (t_p ≤ 100 µs), and features 30 kV ESD rating per IEC 61000-4-2 (contact discharge), enabling robust operation in industrial power supply rails and overvoltage protection circuits.

For engineers reviewing the HPZR-C33X datasheet, HPZR-C33X pinout, HPZR-C33X application, or HPZR-C33X equivalent, key selection criteria include its 33 V Zener voltage at I_Z = 20 mA, 28 Ω differential resistance, 0.1 µA reverse current at V_R, thermal resistance of 18 K/W (junction-to-solder point), and compatibility with standard FR4 PCB layouts using 1 cm² cathode pad for rated power handling.

Technical Context

This device operates as a two-terminal, silicon planar Zener diode optimized for stable voltage reference and transient suppression in low-current regulation functions. Its junction temperature is rated up to 150 °C, and it maintains specified V_Z performance across ambient temperatures from −55 °C to +150 °C.

The HPZR-C33X exhibits a typical forward voltage of ≤1 V at I_F = 100 mA and achieves 4.1 W DC power dissipation only when mounted with zero lead length on thermally optimized PCBs - specifically requiring a 1 cm² tin-plated copper pad on the cathode side per datasheet condition [2].

Key Specifications

Pinout & Package

HPZR-C33X uses the CFP3 (SOD123W) surface-mount plastic package: 2.6 mm × 1.7 mm × 1.0 mm body, flat lead profile, and cathode-marked with a bar on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C33 and MMSZ5252B, HPZR-C33X uniquely combines 4.1 W DC power handling, 800 W surge capacity, and 30 kV ESD immunity in the same SOD123W footprint - making it the only option for high-reliability 33 V regulation where thermal and transient robustness are co-constrained.

Availability

HPZR-C33X is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom line cards, and medical diagnostic equipment requiring stable component supply with guaranteed long-term continuity.

Supply support for HPZR-C33X 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 delivering high-performance, reliable, and efficient components for automotive, industrial, and consumer applications, with leadership in logic, discrete, and MOSFET technologies.

The HPZR series belongs to Nexperia's high-power Zener diode product line, engineered specifically for demanding voltage regulation and transient suppression tasks where thermal performance and ESD resilience are critical design requirements.

FAQ

What is the maximum continuous Zener current for HPZR-C33X at 25 °C ambient?

The HPZR-C33X supports up to 400 mA forward current (I_F) per absolute maximum ratings, but its usable Zener current is constrained by thermal limits. At T_amb = 25 °C on an FR4 PCB with 1 cm² cathode pad, the 962 mW total power dissipation limit yields ~29 mA continuous current (962 mW ÷ 33 V), assuming negligible forward drop. Higher currents require active cooling or derating.

Can HPZR-C33X replace standard 1N4728A in existing designs?

No - while both regulate at ~3.3 V, HPZR-C33X is a 33 V device (not 3.3 V); the "C33" suffix denotes 33 V nominal Zener voltage. The 1N4728A is a 3.3 V, 1 W through-hole Zener. For 33 V replacement, HPZR-C33X can substitute for 1N4755A (33 V, 1 W) only if the PCB layout accommodates SOD123W and provides adequate thermal copper area for 4.1 W operation.

How does the 30 kV ESD rating translate to real-world board-level protection?

The 30 kV rating applies to contact discharge per IEC 61000-4-2 and is measured at the cathode solder point. In practice, this means the diode survives direct ESD strikes to its cathode terminal during handling or connector mating without parameter shift or failure - reducing or eliminating the need for additional TVS diodes in many front-end protection schemes.

Is HPZR-C33X suitable for automotive applications?

HPZR-C33X is not AEC-Q200 qualified and is explicitly designated as non-automotive in Nexperia's legal disclaimers. While its −55 °C to +150 °C operating range meets some under-hood temperature requirements, it lacks automotive-grade qualification testing (e.g., vibration, extended life test, HTOL). Use in automotive production requires formal validation by the end customer and acceptance of associated liability per Nexperia's terms.