Renesas HZ18-1LTD-E

Overview

HZ18-1LTD-E from Renesas Electronics 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), dynamic resistance of 15.0 Ω at 0.5 mA, maximum power dissipation of 400 mW, and low leakage current ≤1 μA at VR = 15.0 V. It is used in high-stability power supply feedback paths and sensor biasing networks where noise sensitivity is critical.

For engineers reviewing the HZ18-1LTD-E datasheet, HZ18-1LTD-E pinout, HZ18-1LTD-E application, or HZ18-1LTD-E equivalent, this device is selected for low-noise voltage regulation in instrumentation amplifiers, precision ADC references, and industrial control loop references - requiring verified zener impedance, temperature coefficient stability, and DO-35 package compatibility with through-hole PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode with DC-tested zener voltage specification and exhibits a temperature coefficient of approximately −0.04 %/°C (−7.5 mV/°C) near 17 V, confirmed by Figure 2 in REJ03G0182-0300 Rev.3.00. Its low-noise performance stems from planar process optimization, achieving ~1/3–1/10 the noise level of legacy HZ-series diodes.

The device is rated for junction temperatures up to 175°C and storage from −55°C to +175°C, with thermal derating defined in Figure 3. It uses a DO-35 glass axial package (RENESAS code GRZZ0002ZB-A, JEITA SC-40), with cathode identified by a navy-blue band and body color orange.

Key Specifications

Pinout & Package

Package: DO-35 (glass axial, RENESAS code GRZZ0002ZB-A, JEITA SC-40), 2.0 mm diameter × 26.0 mm length, orange body with navy-blue cathode band, mass ≈ 0.13 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4744A and BZX85C18, HZ18-1LTD-E offers superior noise performance and tighter V_Z distribution at the expense of lower power rating and DO-35 footprint - making it optimal for space-constrained, low-noise analog reference designs rather than high-power regulation.

Availability

HZ18-1LTD-E is available at Aetrix Electronics and suitable for industrial automation, test and measurement equipment, and precision analog signal conditioning requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant sourcing.

Supply support for HZ18-1LTD-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 Corporation is a global semiconductor manufacturer specializing in microcontrollers, analog and power devices, and system-on-chip solutions for industrial, automotive, and infrastructure markets.

HZ18-1LTD-E belongs to the HZ-L Series of low-noise silicon planar Zener diodes, designed specifically for high-accuracy voltage reference and stabilization in noise-sensitive analog systems such as instrumentation, medical diagnostics, and precision power supplies.

FAQ

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

The HZ18-1LTD-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, per REJ03G0182-0300 Rev.3.00 page 3. This 0.8 V total spread reflects tight process control for precision reference use, and the typical value is 17.3 V. The HZ18-1LTD-E maintains this specification under DC test conditions as noted in the datasheet.

Does HZ18-1LTD-E have a documented temperature coefficient, and how does it affect circuit stability?

Yes - the HZ18-1LTD-E exhibits a zener voltage temperature coefficient (γ_Z) of approximately −0.04 %/°C (−7.5 mV/°C) near 17 V, as shown in Figure 2 of REJ03G0182-0300 Rev.3.00. This negative coefficient allows predictable drift compensation when paired with positive-TC components, and the HZ18-1LTD-E's consistency across the HZ-L family simplifies multi-voltage reference designs.

Is HZ18-1LTD-E RoHS compliant and lead-free?

Yes, HZ18-1LTD-E is RoHS compliant and lead-free, consistent with Renesas Electronics' environmental policy stated in REJ03G0182-0300 Rev.3.00 and confirmed on the Renesas website. The device meets EU RoHS Directive requirements for restricted substances, and no lead or other banned materials are used in its DO-35 glass package or internal die construction.

What is the maximum allowable reverse leakage current for HZ18-1LTD-E, and at what voltage is it measured?

The maximum reverse leakage current for HZ18-1LTD-E is 1 μA, measured at V_R = 15.0 V (page 3, Electrical Characteristics table). This low leakage ensures minimal error current in high-impedance reference nodes - a key advantage of the HZ-L series over standard Zeners - and directly contributes to the stability of the HZ18-1LTD-E in precision biasing applications.

Can HZ18-1LTD-E be used in surface-mount designs?

No - HZ18-1LTD-E uses a DO-35 axial glass package with radial leads, intended for through-hole mounting only. It is not compatible with SMT reflow or paste processes. For surface-mount equivalents, designers should consider Renesas' HZ-L series SOD-123 variants (if available) or alternative low-noise Zener families with SMT packages; the HZ18-1LTD-E itself requires wave soldering or hand assembly into plated-through holes.