Renesas HZ5B3J-E

Overview

HZ5B3J-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 5.7 V (min 5.4 V, max 5.7 V), 400 mW power dissipation, 80 Ω dynamic impedance at 0.5 mA test current, and DO-35 glass package with navy-blue cathode band.

For engineers reviewing the HZ5B3J-E datasheet, HZ5B3J-E pinout, HZ5B3J-E application, or HZ5B3J-E equivalent, key selection criteria include zener voltage tolerance (±0.3 V), low noise performance (1/3–1/10 lower than standard HZ series), thermal coefficient behavior, and compatibility with through-hole PCB layouts requiring stable 5.7 V reference under low-current bias conditions.

Technical Context

The HZ5B3J-E operates as a two-terminal voltage reference device using silicon planar junction technology, with zener breakdown mechanism dominant in its 5.7 V operating range. Its low dynamic resistance (80 Ω) and low leakage current support high-accuracy regulation in feedback paths of linear regulators and sensor signal conditioning circuits.

Designed for DC-biased operation only, the device exhibits a negative temperature coefficient near 5.7 V (≈ −0.04 %/°C per Fig.2), enabling predictable drift compensation in temperature-sensitive references. It is not rated for transient suppression or AC-clamping applications.

Key Specifications

Pinout & Package

Package: DO-35 glass axial 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 reference applications.

Compared with 1N5232B and BZX55-C5V6, the HZ5B3J-E delivers superior voltage accuracy (±0.3 V vs. ±5%), quantifiably lower noise, and guaranteed low-leakage performance at microamp bias levels-making it uniquely suited for metrology-grade and high-fidelity analog systems.

Availability

HZ5B3J-E is available at Aetrix Electronics and suitable for precision analog instrumentation, audio signal processing, industrial sensor interfaces, and portable test equipment requiring stable component supply with traceable lot history and long-term obsolescence management.

Supply support for HZ5B3J-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog mixed-signal devices, and power management ICs for industrial, automotive, and infrastructure markets.

The HZ-L Series, including HZ5B3J-E, was developed specifically for low-noise voltage reference applications demanding tighter zener voltage tolerance, reduced dynamic impedance, and enhanced thermal stability compared to legacy Zener families.

FAQ

What is the exact zener voltage range for HZ5B3J-E at 0.5 mA test current?

The HZ5B3J-E has a specified zener voltage range of 5.4 V minimum to 5.7 V maximum when tested at I_Z = 0.5 mA, per Renesas datasheet REJ03G0182-0300 Rev.3.00. This 5.7 V nominal value with ±0.3 V tolerance makes HZ5B3J-E suitable for applications requiring tighter regulation than standard 5.6 V Zeners. The HZ5B3J-E achieves this via process-controlled planar junction design.

Does HZ5B3J-E support AC or pulsed operation?

No, the HZ5B3J-E is characterized and rated exclusively for DC operation, as explicitly stated in the datasheet note: "Tested with DC." Its electrical characteristics-including dynamic resistance, leakage, and noise-are specified under steady-state DC bias. Using HZ5B3J-E in AC-clamp or transient-suppression roles is outside its validated operating conditions and may compromise stability or longevity.

What is the thermal coefficient behavior of HZ5B3J-E?

The HZ5B3J-E exhibits a negative temperature coefficient near its 5.7 V operating point, approximately −0.04 %/°C (or −2.3 mV/°C), consistent with the trend shown in Figure 2 of the HZ-L Series datasheet. This predictable drift allows designers to compensate for temperature-induced reference shift in high-accuracy systems. The HZ5B3J-E's coefficient is confirmed across the 5.2–38 V family range, with lowest drift observed in the 5–6 V segment.

Can HZ5B3J-E be used as a direct replacement for HZ6B3L?

No-HZ5B3J-E and HZ6B3L are distinct part numbers within the same HZ-L family but differ in zener voltage grade: HZ5B3J-E is 5.4–5.7 V, while HZ6B3L is 5.7–6.0 V. Though both share DO-35 packaging and low-noise design, their V_Z ranges do not overlap. Substituting HZ5B3J-E for HZ6B3L would shift the reference by up to 0.3 V, potentially violating system accuracy specs. Always verify target V_Z before interchange.

What is the maximum allowable ambient temperature for continuous operation of HZ5B3J-E?

The HZ5B3J-E can operate continuously at ambient temperatures up to 125°C when power dissipation is derated according to the curve in Figure 3 of the datasheet. At T_a = 125°C, its usable power drops to ~200 mW. Full 400 mW rating applies only at T_a = 25°C. Junction temperature must remain ≤175°C; thus, thermal design must account for PCB copper area and airflow. The HZ5B3J-E's 175°C T_j rating supports extended industrial use.