Renesas HZ27-2J-E

Overview

HZ27-2J-E from Renesas is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 26.2–27.6 V, 400 mW power dissipation, 24.0 Ω dynamic impedance at 0.5 mA test current, 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 HZ27-2J-E datasheet, HZ27-2J-E pinout, HZ27-2J-E application, or HZ27-2J-E equivalent, key selection criteria include zener voltage tolerance (±0.7 V), low noise performance relative to standard HZ series, temperature coefficient behavior near zero crossing (~0.02 %/°C at ~27 V), and compatibility with through-hole PCB assembly using DO-35 footprint.

Technical Context

The HZ27-2J-E employs a silicon planar junction structure to achieve reduced flicker noise-approximately 1/3 to 1/10 that of legacy HZ-series diodes-by minimizing surface defect density and optimizing doping uniformity. Its zener voltage is specified under DC test conditions at 0.5 mA, with dynamic resistance measured at 1 mA.

Thermal design relies on the DO-35 package's 175 °C maximum junction temperature and derated power dissipation above 25 °C ambient, per Fig.3. The device exhibits a near-zero temperature coefficient around 27 V (≈0.02 %/°C), confirmed by characteristic curves in the datasheet.

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 applications.

Compared with HZ27-2J-E, both alternatives offer higher power ratings but lack its low-noise design and tight ±0.7 V tolerance; the HZ27-2J-E remains optimal for precision analog references where voltage stability and spectral purity are prioritized over surge capability.

Availability

HZ27-2J-E is available at Aetrix Electronics and suitable for industrial power supply monitoring, precision analog reference generation, and high-voltage sensor biasing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HZ27-2J-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 manufacturer specializing in microcontrollers, analog and power devices, and SoC solutions for automotive, industrial, and infrastructure markets.

The HZ-L Series was developed specifically for low-noise, high-stability voltage reference applications in precision analog systems-emphasizing reduced flicker noise, tight zener voltage tolerance, and predictable temperature coefficient behavior.

FAQ

What is the exact zener voltage range for HZ27-2J-E?

The HZ27-2J-E has a guaranteed zener voltage range of 26.2 V to 27.6 V when tested at I_Z = 0.5 mA and T_a = 25 °C. This ±0.7 V tolerance is tighter than standard 5% Zener diodes and is confirmed in the Electrical Characteristics table on page 3 of REJ03G0182-0300 Rev.3.00. The HZ27-2J-E achieves this via process-controlled planar junction fabrication.

Is HZ27-2J-E suitable for low-noise audio applications?

Yes-the HZ27-2J-E is explicitly characterized for low-noise operation, with diode noise approximately 1/3 to 1/10 that of the legacy HZ series. Its silicon planar structure minimizes surface-generated flicker noise, making it appropriate for microphone preamplifier biasing and DAC reference stages where broadband noise below 10 kHz must be suppressed. The HZ27-2J-E datasheet confirms this in the Features section on page 1.

What is the maximum allowable reverse current before breakdown in HZ27-2J-E?

The HZ27-2J-E specifies a maximum reverse leakage current (I_R) of 1 μA at V_R = 20.2 V, per the Electrical Characteristics table. This value is measured well below nominal zener voltage and ensures negligible error current in high-impedance reference divider networks. Exceeding 20.2 V in reverse bias risks entering uncontrolled breakdown unless current is externally limited.

Does HZ27-2J-E have a defined temperature coefficient, and how does it affect stability?

Yes-the HZ27-2J-E exhibits a zener voltage temperature coefficient (γ_Z) of approximately 0.02 %/°C near 27 V, as shown in Fig.2 of the datasheet. This near-zero crossing enables minimal drift over industrial temperature ranges (−40 to +85 °C), yielding <±0.05% total variation. The HZ27-2J-E leverages this property for stable references in unregulated power rails.

Can HZ27-2J-E be used in surface-mount designs?

No-the HZ27-2J-E is packaged exclusively in the through-hole DO-35 axial glass case (JEITA code GRZZ0002ZB-A) and lacks SMD variants. Its 2.0 mm diameter and 26.0 mm length require axial mounting with lead forming. For surface-mount equivalents, Renesas offers no direct replacement; alternative low-noise SOT-23 Zeners like the BZX84-C27 have higher noise and looser tolerance than the HZ27-2J-E.