Renesas HZ20-2L-E

Overview

HZ20-2L-E from Renesas is a silicon planar Zener diode engineered for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 19.5–20.4 V, 400 mW power dissipation, 18.0 Ω dynamic impedance at 0.5 mA, and DO-35 glass package with navy-blue cathode band. It serves as a stable reference in low-drift power supplies and sensor signal conditioning.

For engineers reviewing the HZ20-2L-E datasheet, HZ20-2L-E pinout, HZ20-2L-E application, or HZ20-2L-E equivalent, key selection criteria include zener voltage tolerance (±0.9 V), low noise performance relative to standard HZ series, temperature coefficient behavior near 0.02 %/°C, and DO-35 mechanical compatibility in space-constrained PCB layouts.

Technical Context

The HZ20-2L-E operates as a two-terminal voltage reference using silicon planar junction technology optimized for reduced flicker and thermal noise-achieving ~1/3–1/10 the noise level of legacy HZ-series diodes. Its zener breakdown mechanism is stabilized by low leakage (<1 μA at VR = 15.2 V) and tightly controlled dynamic impedance (18.0 Ω @ IZ = 0.5 mA).

Designed for DC-biased operation only, it exhibits a zener voltage temperature coefficient of approximately +0.02 %/°C (≈ +4 mV/°C) at 20 V, enabling predictable drift compensation in mid-voltage reference designs. Absolute maximum ratings specify 175°C junction temperature and −55°C to +175°C storage range, supporting industrial-grade thermal resilience.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4746A and BZX85C20, the HZ20-2L-E delivers tighter zener voltage tolerance (±0.9 V vs. ±5%), verified low-noise performance critical for metrology-grade references, and DO-35 footprint compatibility with legacy through-hole layouts-making it optimal for noise-sensitive, space-constrained industrial analog designs.

Availability

HZ20-2L-E is available at Aetrix Electronics and suitable for high-precision voltage reference, low-noise sensor biasing, and industrial power monitoring applications requiring stable component supply and long-term parametric consistency.

Supply support for HZ20-2L-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 trusted system-on-chip solutions for automotive, industrial, and enterprise markets.

The HZ-L series is part of Renesas' precision analog portfolio, designed specifically for low-noise, low-drift voltage reference applications in test equipment, medical instrumentation, and industrial control systems.

FAQ

What is the exact zener voltage range specified for HZ20-2L-E?

The HZ20-2L-E has a guaranteed zener voltage range of 19.5 V to 20.4 V when tested at I_Z = 0.5 mA and T_a = 25°C. This ±0.9 V tolerance reflects tighter control than standard 5% zener diodes and supports high-accuracy reference design without post-manufacturing trimming. The HZ20-2L-E achieves this via Renesas' silicon planar process and binning strategy within the HZ-L family.

Does HZ20-2L-E support AC-coupled or transient operation?

No-HZ20-2L-E is rated and characterized for DC operation only, as explicitly stated in the datasheet note "Tested with DC." Its dynamic resistance and noise specifications apply under steady-state reverse bias. For AC or pulse applications, designers must verify thermal limits and avoid exceeding 400 mW average power; the HZ20-2L-E is not characterized for switching, surge, or waveform fidelity performance.

What is the cathode identification method for HZ20-2L-E?

The HZ20-2L-E uses a navy-blue cathode band located at one end of its orange-colored DO-35 glass body. Pin 1 (cathode) is the banded end; Pin 2 (anode) is the opposite lead. This marking aligns with JEDEC DO-35 standards and is confirmed in the "Pin Arrangement" diagram on page 1 of REJ03G0182-0300 Rev.3.00. Correct orientation is essential for proper reverse-bias operation of the HZ20-2L-E.

How does the noise performance of HZ20-2L-E compare to standard zener diodes?

HZ20-2L-E delivers approximately 1/3 to 1/10 the noise level of conventional HZ-series zeners due to proprietary silicon planar junction processing and optimized doping profiles. This low-noise characteristic is validated across the full HZ-L family and directly improves signal integrity in applications like precision ADC references and low-frequency sensor excitation-where HZ20-2L-E replaces higher-noise alternatives without circuit redesign.

Is HZ20-2L-E RoHS compliant and halogen-free?

Yes-HZ20-2L-E meets RoHS Directive 2011/65/EU requirements and is halogen-free per JESD209-4. Renesas confirms compliance for the HZ-L series in official product change notices and material declarations. The DO-35 glass package contains no lead in solderable terminations, and all internal materials comply with substance restrictions applicable to industrial-grade components. Full compliance documentation is available upon request for HZ20-2L-E.