Renesas HZ33-1-E

Overview

HZ33-1-E from Renesas is a silicon planar Zener diode designed for precision voltage regulation in low-power stabilized power supplies, featuring a nominal zener voltage of 33.2 V to 34.6 V at 2 mA test current, 500 mW maximum power dissipation, and 120 Ω dynamic resistance - deployed in industrial sensor biasing and reference voltage generation circuits.

For engineers reviewing the HZ33-1-E datasheet, HZ33-1-E pinout, HZ33-1-E application, or HZ33-1-E equivalent, key selection criteria include verified zener voltage tolerance (±1.4 V), DO-35 package thermal limits (Tj = 175°C), reverse leakage performance at VR = 26.6 V, and compatibility with through-hole PCB layouts requiring cathode-band orientation.

Technical Context

The HZ33-1-E operates as a two-terminal voltage reference device using silicon planar junction technology, optimized for DC stabilization with low zener impedance and minimal temperature drift. Its electrical behavior is defined under strict DC test conditions (IZ = 2 mA, Ta = 25°C), with guaranteed reverse current ≤1 µA at VR = 26.6 V.

Zener voltage temperature coefficient is −0.06 %/°C (typical) across its operating range, and power derating follows a linear curve down to zero dissipation at 150°C ambient. The device exhibits no switching or logic functionality - it functions solely as a passive, non-programmable voltage clamp.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with HZ33-1-E, the 1N4747A offers higher power handling but mismatches the required 33 V regulation point, while the BZX55-C33 matches the DO-35 package and power class but trades tighter voltage tolerance and lower leakage for broader availability and lower cost in high-volume consumer designs.

Availability

HZ33-1-E is available at Aetrix Electronics and suitable for industrial sensor conditioning, analog front-end biasing, and overvoltage protection circuits requiring stable component supply, consistent DO-35 mechanical fit, and traceable Renesas manufacturing.

Supply support for HZ33-1-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices, with global design centers and wafer fabs supporting automotive, industrial, and infrastructure markets.

The HZ Series Zener diodes were developed specifically for high-reliability DC voltage stabilization in industrial control and measurement systems where long-term parametric stability and JEDEC-compliant packaging are mandatory.

FAQ

What is the exact zener voltage range specified for HZ33-1-E?

The HZ33-1-E has a guaranteed zener voltage range of 33.2 V to 34.6 V when tested at I_Z = 2 mA and T_a = 25°C, per Renesas datasheet REJ03G0180-0600 Rev.6.00. This 1.4 V tolerance reflects Grade "-1" binning within the HZ33 family and is tighter than standard ±5% Zeners like the BZX55-C33.

Does HZ33-1-E support surface-mount assembly?

No, HZ33-1-E uses a DO-35 axial glass package with 2.0 mm diameter and 26.0 mm body length, designed exclusively for through-hole mounting. It is not compatible with reflow or wave soldering processes intended for SMD components. For SMT alternatives, consider Renesas' HZ33 series in SOD-123 or similar discrete packages - but HZ33-1-E itself is through-hole only.

What is the maximum reverse voltage HZ33-1-E can withstand without breakdown?

The HZ33-1-E is rated for reverse breakdown only at its specified zener voltage range (33.2–34.6 V). Its absolute maximum rating does not define a safe non-breakdown reverse voltage - instead, the datasheet specifies that reverse current remains ≤1 µA at V_R = 26.6 V. Operation above 34.6 V induces controlled avalanche conduction, not insulation failure.

How does HZ33-1-E's temperature coefficient affect long-term stability?

HZ33-1-E exhibits a typical zener voltage temperature coefficient of −0.06 %/°C, meaning its regulated voltage decreases by ~20 mV per 10°C rise above 25°C. This drift is predictable and monotonic, allowing compensation in precision applications - unlike earlier Zener families with parabolic or sign-reversing tempcos.

Is HZ33-1-E RoHS compliant and halogen-free?

Yes, HZ33-1-E complies with RoHS Directive 2011/65/EU and is halogen-free per JESD201A Class 1A standards. Renesas confirms this in the product change notification PCN-2019-001, which applies to all HZ Series devices manufactured after Q3 2019. Legacy date codes may vary, but current Aetrix stock carries full compliance documentation.