Renesas HZ18-1J-E

Overview

HZ18-1J-E from Renesas is a silicon planar Zener diode optimized for low-noise voltage reference and stabilization in precision analog circuits, featuring a nominal zener voltage of 17.3 V (min 16.9 V, max 17.7 V), 400 mW power dissipation, 15 Ω dynamic resistance at 0.5 mA, 1 μA maximum reverse leakage at 13.5 V, and DO-35 glass package with navy blue cathode band.

For engineers reviewing the HZ18-1J-E datasheet, HZ18-1J-E pinout, HZ18-1J-E application, or HZ18-1J-E equivalent, key selection criteria include zener voltage tolerance, temperature coefficient (−0.04 %/°C typical), low noise performance versus standard HZ series, thermal derating above 25°C, and compatibility with through-hole PCB layouts requiring SC-40 footprint.

Technical Context

The HZ18-1J-E operates as a two-terminal shunt voltage regulator with DC-tested zener breakdown characteristics. Its low dynamic impedance (15 Ω) and tight V_Z tolerance (±0.4 V at 0.5 mA) support stable biasing in low-current reference paths, while its −0.04 %/°C temperature coefficient minimizes drift across industrial temperature ranges.

Designed for low-noise applications, it achieves approximately 1/3–1/10 the noise level of legacy HZ-series diodes. The DO-35 package enables direct replacement in existing through-hole designs, with junction temperature rated to 175°C and storage range spanning −55°C to +175°C.

Key Specifications

Pinout & Package

Package: DO-35 (JEITA code GRZZ0002ZB-A, Renesas SC-40), glass axial-leaded, orange body with navy blue cathode band, mass 0.13 g, dimensions φD = 2.0 mm, E = 4.2 mm, L = 26.0 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4746A and BZX85C18, the HZ18-1J-E delivers tighter V_Z tolerance (±0.4 V vs. ±5%), lower dynamic impedance (15 Ω vs. ≥20 Ω), and documented low-noise performance-making it uniquely suitable for precision analog reference roles where signal integrity is prioritized over raw power handling.

Availability

HZ18-1J-E is available at Aetrix Electronics and suitable for audio signal conditioning, precision ADC reference, and industrial sensor excitation requiring stable component supply with guaranteed long-term continuity.

Supply support for HZ18-1J-E 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog power, and connectivity solutions for automotive, industrial, and IoT systems.

The HZ-L Series is part of Renesas' precision analog portfolio, engineered specifically for low-noise voltage reference and stabilization in high-fidelity audio, test equipment, and measurement instrumentation.

FAQ

What is the exact zener voltage range for HZ18-1J-E at 0.5 mA test current?

The HZ18-1J-E has a specified zener voltage range of 16.9 V minimum to 17.7 V maximum when tested at I_Z = 0.5 mA, yielding a nominal value of 17.3 V with ±0.4 V tolerance. This tight spread is confirmed in the Renesas REJ03G0182-0300 datasheet on page 3 and supports precise voltage reference design without post-production trimming. The HZ18-1J-E maintains this specification under DC test conditions per note 1 of the electrical characteristics table.

Does HZ18-1J-E have a documented low-noise advantage over standard Zener diodes?

Yes, the HZ18-1J-E is explicitly characterized as having approximately 1/3–1/10 lower diode noise than the legacy HZ series, as stated in the "Features" section of the Renesas REJ03G0182-0300 datasheet. This performance is achieved via silicon planar process optimization and is validated for low-noise applications such as audio preamplifiers and precision ADC references. The HZ18-1J-E inherits this advantage as a member of the HZ-L family.

What is the maximum allowable reverse voltage before breakdown for HZ18-1J-E?

The HZ18-1J-E does not specify a distinct "reverse breakdown threshold" separate from its zener voltage; it is designed to operate in controlled reverse breakdown across its rated V_Z range (16.9–17.7 V). Reverse leakage remains ≤1 μA up to 13.5 V, and the device enters stable regulation above ~16.9 V. Exceeding 17.7 V under unregulated conditions risks exceeding P_d = 400 mW unless current is strictly limited. The HZ18-1J-E datasheet confirms this behavior in the Electrical Characteristics table on page 3.

Can HZ18-1J-E replace standard 18 V Zeners like 1N4746A in existing designs?

The HZ18-1J-E is not a direct pin-compatible replacement for 1N4746A due to differing packages: HZ18-1J-E uses DO-35 (SC-40), while 1N4746A uses DO-41. Though both are axial-leaded, their lead spacing and body dimensions differ-DO-35 has E = 4.2 mm vs. DO-41's 10 mm. Additionally, the HZ18-1J-E offers tighter V_Z tolerance and lower noise but lower power (400 mW vs. 1 W). A layout change is required to use HZ18-1J-E in place of 1N4746A.

What is the temperature coefficient of HZ18-1J-E and how does it affect long-term stability?

The HZ18-1J-E exhibits a typical zener voltage temperature coefficient (γ_Z) of −0.04 %/°C, as shown in Figure 2 of the Renesas REJ03G0182-0300 datasheet. Over a 0–70°C ambient range, this results in a total drift of approximately −28 mV (−0.04 % × 17.3 V × 70°C), enabling stable reference performance in industrial environments. This coefficient is significantly better than generic 18 V Zeners (often ±0.1 %/°C), making the HZ18-1J-E suitable for applications demanding low thermal drift.