Nexperia USA Inc. HPZR-C18X

Overview

HPZR-C18X from Nexperia is a high-power Zener voltage regulator diode in CFP3 (SOD123W) surface-mount package, designed for precision DC voltage clamping and regulation at 18 V nominal working voltage (V_Z = 16.7–18.5 V @ I_Z = 1 mA), with 4.1 W total power dissipation at T_sp = 75 °C and ESD rating of 30 kV per IEC 61000-4-2 (contact discharge), used in industrial power supply rail protection and overvoltage suppression circuits.

For engineers reviewing the HPZR-C18X datasheet, HPZR-C18X pinout, HPZR-C18X application, or HPZR-C18X equivalent, key selection criteria include its 18 V Zener voltage tolerance (±5 %), low differential resistance (R_Z = 15 Ω @ I_Z = 20 mA), thermal resistance to solder point (R_th(j-sp) = 18 K/W), and non-repetitive peak power capability of 800 W for ≤100 µs pulses.

Technical Context

This device operates as a two-terminal, silicon planar Zener diode optimized for stable reverse-bias voltage regulation under transient and steady-state conditions. Its design targets high surge robustness (I_FSM = 50 A, 8.3 ms half-sine) and low thermal impedance via direct cathode tab thermal path to PCB.

It features a nominal 18 V Zener voltage with tight ±5 % tolerance, specified at I_Z = 1 mA, and exhibits low dynamic impedance (15 Ω) and minimal reverse leakage (≤0.1 µA @ V_R = 14.4 V), enabling accurate regulation in low-current reference and protection applications.

Key Specifications

Pinout & Package

HPZR-C18X uses the CFP3 (SOD123W) surface-mount plastic package: 2.6 mm × 1.7 mm × 1.0 mm body, flat lead profile, cathode marked by bar on top surface. Thermal performance relies on cathode tab soldering to ≥1 cm² copper pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C18 and SMLZ18T1G, HPZR-C18X delivers 13.7× higher continuous power (4.1 W vs. 0.3 W), 2.7× better ESD immunity (30 kV vs. 16 kV), and 3.9× lower thermal resistance to solder point-making it uniquely suited for high-reliability industrial and automotive-climate power rail protection.

Availability

HPZR-C18X is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control module clamping, medical equipment reference stabilization, and telecom DC-DC converter feedback clamp applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for HPZR-C18X 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-performance, reliable standard logic, discrete, and MOSFET components, serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality systems.

The HPZR series belongs to Nexperia's high-power Zener regulator product line, engineered specifically for robust overvoltage protection and precision DC rail clamping in thermally demanding, ESD-prone environments such as factory automation and vehicle electronics.

FAQ

What is the maximum continuous power dissipation for HPZR-C18X at 75 °C solder point temperature?

The maximum continuous power dissipation is 4100 mW (4.1 W) when measured at zero lead length and T_sp = 75 °C, as defined in Table 4 and confirmed in Table 5 of the datasheet. This value assumes direct thermal coupling of the cathode tab to a 1 cm² copper pad on FR4 PCB.

Does HPZR-C18X meet automotive ESD requirements?

Yes-HPZR-C18X achieves 30 kV contact discharge per IEC 61000-4-2 and exceeds MIL-STD-883 Class 3 HBM (>8 kV), satisfying common automotive ESD stress test levels including ISO 10605 (30 kV air, 15 kV contact). It is not AEC-Q200 qualified but meets ESD thresholds required for many non-safety-critical vehicle subsystems.

How does the differential resistance (R_Z) of HPZR-C18X affect regulation accuracy?

With R_Z = 15 Ω at I_Z = 20 mA, a 10 mA change in Zener current causes only a 150 mV shift in output voltage-enabling stable regulation under varying load conditions. This low dynamic impedance is critical for minimizing output ripple in precision reference and feedback applications.

Can HPZR-C18X be used in parallel for higher power handling?

No-Zener diodes exhibit negative temperature coefficient and mismatched V_Z tolerances, causing current hogging and thermal runaway when paralleled. For higher power, use a single higher-rated device or implement active regulation with a transistor-based shunt amplifier instead of direct parallel connection.