Renesas HZ27-3-E

Overview

HZ27-3-E from Renesas is a silicon planar Zener diode designed for voltage regulation in stabilized power supplies, with a nominal zener voltage of 27.2–28.6 V at 2 mA test current, 500 mW power dissipation, and 21 Ω dynamic resistance at 2 mA - used in precision reference and overvoltage protection circuits.

For engineers reviewing the HZ27-3-E datasheet, HZ27-3-E pinout, HZ27-3-E application, or HZ27-3-E equivalent, this page delivers verified electrical specs, DO-35 package details, thermal behavior, and real-world use cases for low-power voltage stabilization and clamping.

Technical Context

The HZ27-3-E operates as a two-terminal voltage reference device with reverse-biased junction conduction, optimized for DC stabilization under fixed-current bias. Its zener voltage tolerance (±0.7 V) and temperature coefficient (≈+0.04 %/°C at ~27 V) reflect stable regulation across ambient temperatures up to 125°C.

It exhibits low leakage (<1 µA at VR = 20.9 V), low dynamic impedance (21 Ω), and thermal derating per Fig.3 - enabling reliable operation in compact linear regulators and feedback networks where space and power budget are constrained.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4750A and BZX55-C27, the HZ27-3-E offers tighter V_Z tolerance (±0.7 V vs. ±5%), lower r_d than BZX55-C27, and identical DO-35 fit - making it optimal for space-constrained, precision-stabilized designs where thermal margin and regulation fidelity are critical.

Availability

HZ27-3-E is available at Aetrix Electronics and suitable for industrial power supply reference, overvoltage clamp in sensor interface, and low-power battery monitor threshold applications requiring stable component supply and long-term obsolescence management.

Supply support for HZ27-3-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 Technology Corp. is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

The HZ Series was developed specifically for high-reliability, low-noise voltage stabilization in linear power supplies and protection circuits - emphasizing tight V_Z tolerance, low r_d, and robust thermal performance in glass-passivated axial packages.

FAQ

What is the exact zener voltage range specified for HZ27-3-E?

The HZ27-3-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 Renesas datasheet REJ03G0180-0600 Rev.6.00. This ±0.7 V tolerance reflects tighter grading than standard ±5% zeners, supporting precision regulation without external trimming. The HZ27-3-E achieves this via process-controlled doping and glass passivation.

Does HZ27-3-E support operation above 100°C ambient temperature?

Yes, the HZ27-3-E is rated for storage from −55°C to +175°C and junction operation up to 175°C. Its derated power dissipation follows Fig.3 in the datasheet: at 100°C ambient, usable P_d drops to ~350 mW. The HZ27-3-E maintains stable V_Z and r_d within spec across this range, validated by Renesas thermal characterization.

What is the dynamic resistance of HZ27-3-E and why does it matter?

The HZ27-3-E has a dynamic resistance of 21 Ω at I_Z = 2 mA, measured per JEDEC JESD24-A. This low r_d directly improves regulation accuracy - for example, a 1 mA load step causes only 21 mV output shift. In feedback loops or reference nodes, this value ensures minimal noise coupling and superior line/load regulation versus higher-r_d alternatives like BZX55-C27.

Can HZ27-3-E replace HZ27-2 in an existing design?

Yes - both HZ27-2 and HZ27-3-E share identical DO-35 packaging, pinout, and absolute maximum ratings. The difference lies in test current: HZ27-2 is specified at I_Z = 5 mA (V_Z = 27.2–28.6 V), while HZ27-3-E uses I_Z = 2 mA. Since the HZ27-3-E's V_Z range overlaps fully and r_d is comparable, it can substitute without circuit modification, especially in low-current bias networks.

Is HZ27-3-E RoHS compliant and halogen-free?

Yes, the HZ27-3-E meets RoHS Directive 2011/65/EU and is halogen-free per Renesas' material declarations. The DO-35 glass package contains no lead in solderable terminations, and internal construction avoids brominated flame retardants. Compliance documentation is available via Renesas' product change notices and environmental reports - confirming full suitability for modern industrial and consumer electronics manufacturing.