Renesas HZ27-1-E

Overview

HZ27-1-E from Renesas is a silicon planar Zener diode designed for precision voltage regulation in low-power stabilized power supplies, with a nominal zener voltage of 27.2–28.6 V at 2 mA, 21.0 Ω dynamic resistance, and 500 mW maximum power dissipation in DO-35 package.

For engineers reviewing the HZ27-1-E datasheet, HZ27-1-E pinout, HZ27-1-E application, or HZ27-1-E equivalent, this device serves as a discrete voltage reference in analog sensing circuits, overvoltage protection clamps, and feedback networks where tight tolerance (±0.7 V), low temperature coefficient (−0.04 %/°C typical), and stable DC regulation are required.

Technical Context

The HZ27-1-E operates as a two-terminal shunt regulator with cathode-anode polarity, optimized for DC bias conditions per JEDEC test standards. Its zener breakdown mechanism delivers predictable reverse conduction above 27.2 V with minimal leakage (<1 µA at 20.2 V) and low impedance across its rated current range.

Thermal performance is defined by a 175°C maximum junction temperature and −55°C to +175°C storage range. Power derating follows a linear curve: full 500 mW at 25°C ambient, decreasing to zero at ~125°C per Figure 3 in the datasheet.

Key Specifications

Pinout & Package

DO-35 glass axial package with navy blue cathode band; total mass 0.13 g; body diameter 2.0 mm max, length 26.0 mm min, lead spacing 4.2 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HZ27-1-E, the 1N4748A offers higher power headroom but larger size, while the BZX55-C27 matches the DO-35 form factor but sacrifices regulation stability due to 67% higher r_d, making HZ27-1-E preferable for precision feedback paths.

Availability

HZ27-1-E is available at Aetrix Electronics and suitable for industrial power supplies, analog sensor interfaces, and overvoltage protection circuits requiring stable component supply, long-lifecycle support, and traceable sourcing from Renesas-authorized channels.

Supply support for HZ27-1-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 power devices, and timing solutions for industrial, automotive, and infrastructure markets.

HZ27-1-E belongs to the HZ Series silicon planar Zener diodes, engineered specifically for high-stability DC voltage reference and clamping in space-constrained, thermally demanding environments.

FAQ

What is the exact zener voltage range specified for HZ27-1-E?

The HZ27-1-E has a guaranteed zener voltage range of 27.2 V to 28.6 V when tested at I_Z = 2 mA and T_a = 25°C, per page 4 of Renesas document REJ03G0180-0600 Rev.6.00. This 1.4 V span reflects grade "-1" tolerance within the HZ27 family, and the value is measured using DC test conditions as noted in the datasheet.

Is HZ27-1-E compatible with automated through-hole assembly processes?

Yes, HZ27-1-E uses the standard DO-35 axial package with 4.2 mm lead spacing and 2.0 mm body diameter, fully compatible with wave soldering and selective soldering equipment. The glass body and tinned leads meet IPC-J-STD-006 requirements, and Renesas specifies no special pre-bake or handling restrictions for HZ27-1-E in manufacturing environments.

Does HZ27-1-E have a specified temperature coefficient, and how does it affect regulation accuracy?

Yes, HZ27-1-E exhibits a zener voltage temperature coefficient (γ_Z) of −0.04 %/°C near 27 V, as shown in Figure 2 of the datasheet. Over a −40°C to +85°C range, this results in approximately ±50 mV total drift - a critical factor when designing for ±0.2% overall system accuracy in unregulated environments.

Can HZ27-1-E be used in series or parallel configurations for higher voltage or current capability?

No - HZ27-1-E is not characterized or recommended for series or parallel operation. Its zener voltage tolerance and dynamic resistance mismatch between units would cause uneven current sharing and thermal runaway in parallel, and cumulative tolerance errors exceed practical limits in series. Use a single HZ27-1-E per regulation node as intended.

What is the maximum reverse leakage current for HZ27-1-E at its rated voltage?

The maximum reverse leakage current for HZ27-1-E is 1 µA at V_R = 20.2 V (85% of nominal V_Z), per the Electrical Characteristics table on page 4 of REJ03G0180-0600. At voltages below 20.2 V, leakage remains sub-microampere, supporting ultra-low-power bias networks in battery-operated instrumentation.