Renesas HZ5A2J-E

Overview

HZ5A2J-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 5.3 V (min) to 5.6 V (max), 400 mW power dissipation, 80 Ω dynamic resistance at 0.5 mA test current, and DO-35 glass package with navy blue cathode band. It serves in stabilized reference supplies for instrumentation amplifiers and sensor signal conditioning.

For engineers reviewing the HZ5A2J-E datasheet, HZ5A2J-E pinout, HZ5A2J-E application, or HZ5A2J-E equivalent, key selection criteria include zener voltage tolerance (±0.3 V), low noise performance (1/3–1/10 of standard HZ series), temperature coefficient behavior near 5.5 V, and DO-35 mechanical compatibility in space-constrained PCB layouts.

Technical Context

The HZ5A2J-E operates as a two-terminal voltage reference using silicon planar junction technology optimized for reduced flicker and thermal noise. Its zener voltage is specified at 0.5 mA test current with DC excitation, and it exhibits a typical temperature coefficient near zero crossing in the 5–6 V range.

Designed for low-leakage operation (IR ≤ 1 μA at VR = 2.0 V), the device maintains stable regulation under light-load conditions and achieves low dynamic impedance (rd ≤ 80 Ω) without requiring external bypass capacitance-enabling direct integration into high-impedance bias networks.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX55C5V1 and 1N5232B, the HZ5A2J-E delivers tighter voltage tolerance (±0.15 V vs. ±0.25 V), lower noise, and verified low-current regulation at 0.5 mA-making it optimal for battery-powered precision analog stages where bias current and spectral purity are constrained.

Availability

HZ5A2J-E is available at Aetrix Electronics and suitable for instrumentation amplifier references, high-resolution ADC biasing, sensor signal conditioning, industrial PLC analog input modules, and low-noise power supply stabilization requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HZ5A2J-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 mixed-signal solutions for automotive, industrial, and IoT applications, with emphasis on reliability, longevity, and system-level integration.

The HZ-L Series was developed specifically for low-noise, high-stability voltage reference applications in measurement equipment and sensor interfaces-prioritizing zener voltage consistency, temperature coefficient linearity, and noise floor reduction over raw power handling.

FAQ

What is the exact zener voltage range for HZ5A2J-E at 0.5 mA test current?

The HZ5A2J-E has a guaranteed zener voltage range of 5.3 V minimum to 5.6 V maximum when measured at I_Z = 0.5 mA and T_a = 25°C, per Renesas datasheet REJ03G0182-0300 Rev.3.00. This ±0.15 V tolerance enables precise 5 V reference design without post-manufacturing trimming. The HZ5A2J-E achieves this tight specification via process-controlled planar junction doping and screening.

Does HZ5A2J-E support operation above 125°C ambient temperature?

Yes, the HZ5A2J-E is rated for storage temperatures from −55°C to +175°C and junction temperatures up to +175°C. Its DO-35 glass package and silicon planar construction allow reliable operation at ambient temperatures exceeding 125°C when mounted with adequate thermal relief-verified in Renesas' thermal characterization on page 4 of REJ03G0182-0300. Derating applies per Fig.3 power vs. ambient curve.

How does the noise performance of HZ5A2J-E compare to standard Zener diodes?

The HZ5A2J-E exhibits approximately one-third to one-tenth the voltage noise of conventional HZ-series Zeners, as confirmed in the "Features" section of REJ03G0182-0300. This improvement stems from proprietary low-noise junction processing and optimized geometry-directly benefiting audio preamplifiers, precision DACs, and low-frequency sensor interfaces where broadband noise degrades SNR.

Is HZ5A2J-E compatible with automated through-hole assembly processes?

Yes, the HZ5A2J-E uses the standardized DO-35 axial package (JEITA code GRZZ0002ZB-A) with 2.0 mm body diameter and 26 mm length, fully compliant with IPC-7351A axial footprint guidelines. Its navy blue cathode band and orange body provide clear visual polarity identification for AOI inspection, and the 0.13 g mass ensures stable placement during wave soldering.

What is the maximum reverse leakage current for HZ5A2J-E at 2.0 V?

The HZ5A2J-E guarantees reverse leakage current (I_R) of no more than 1 μA when reverse-biased at V_R = 2.0 V and T_a = 25°C, as specified in the Electrical Characteristics table on page 2 of REJ03G0182-0300. This low leakage supports high-impedance bias networks in battery-operated devices and prevents reference voltage droop in micropower sensor nodes.