Renesas HZ33-1LTD-E

Overview

HZ33-1LTD-E from Renesas Electronics is a silicon planar Zener diode optimized for low-noise voltage reference and stabilization in precision analog circuits, featuring a nominal zener voltage of 31.2–32.6 V, 400 mW power dissipation, 30 Ω dynamic impedance at 0.5 mA, and DO-35 glass package with navy-blue cathode band. It serves in low-drift power supply regulation, sensor excitation, and ADC reference buffering where noise sensitivity is critical.

For engineers reviewing the HZ33-1LTD-E datasheet, HZ33-1LTD-E pinout, HZ33-1LTD-E application, or HZ33-1LTD-E equivalent, this page delivers verified electrical specs, thermal behavior, package dimensions, real-world use cases, and validated alternative parts - all aligned to Renesas' HZ-L Series documentation (REJ03G0182-0300 Rev.3.00).

Technical Context

This device operates as a two-terminal, DC-biased voltage reference using avalanche breakdown in a planar-diffused silicon junction. Its low noise level (≈1/3–1/10 that of standard HZ series) stems from optimized doping profile and passivation, enabling stable operation under low-current bias (0.5–1 mA). Temperature coefficient is −0.04 %/°C near 33 V, minimizing drift across −55°C to +175°C ambient range.

The HZ33-1LTD-E exhibits 250 Ω maximum dynamic resistance at 0.5 mA test current, confirming tight regulation under small-signal load variation. Its DO-35 package supports through-hole mounting on FR-4 or paper-phenol PCBs, with thermal derating defined per Figure 3: power dissipation drops linearly from 400 mW at 25°C to zero at 175°C junction temperature.

Key Specifications

Pinout & Package

Package: DO-35 glass axial package (RENESAS Code GRZZ0002ZB-A, JEITA Code SC-40), orange body with navy-blue cathode band. Cathode is marked end; leads are tinned copper alloy, suitable for wave or hand soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX85C33 and 1N5257B, the HZ33-1LTD-E trades higher dynamic resistance for quantifiably lower noise and tighter tempco - making it the sole option among the three qualified for precision analog reference roles in medical and metrology equipment.

Availability

HZ33-1LTD-E is available at Aetrix Electronics and suitable for industrial power monitoring, medical sensor signal conditioning, automotive body control units, and test & measurement equipment requiring stable component supply with guaranteed long-term continuity.

Supply support for HZ33-1LTD-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 Corporation is a global semiconductor leader headquartered in Tokyo, Japan, specializing in microcontrollers, analog power devices, and timing solutions for industrial, automotive, and infrastructure markets.

The HZ-L Series Zener diodes were developed specifically for low-noise, high-stability voltage reference applications in precision analog systems - addressing limitations of legacy HZ-series noise and tempco performance.

FAQ

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

The HZ33-1LTD-E has a guaranteed zener voltage range of 31.2 V to 32.6 V when tested at 0.5 mA DC current, per Renesas datasheet REJ03G0182-0300 Rev.3.00. This 1.4 V span reflects initial tolerance and ensures compatibility with 33 V nominal reference designs requiring ±2.2% margin.

Does HZ33-1LTD-E have a specified noise performance value?

Yes - the HZ33-1LTD-E achieves approximately 1/3 to 1/10 the noise level of standard HZ-series Zener diodes, as stated in the "Features" section of the official Renesas datasheet. While no absolute µV/√Hz figure is published, this relative reduction is confirmed across the HZ-L family and validated in low-noise reference applications.

What is the maximum reverse leakage current for HZ33-1LTD-E?

The HZ33-1LTD-E specifies a maximum reverse leakage current (I_R) of 1 µA at V_R = 27 V, measured at T_a = 25°C. This low leakage supports high-impedance reference nodes and minimizes error in precision bias networks where current draw must remain below nanoampere levels.

Is HZ33-1LTD-E compatible with lead-free reflow soldering processes?

The HZ33-1LTD-E uses a DO-35 glass package with tinned copper alloy leads rated for standard wave and hand soldering. While Renesas does not explicitly certify it for lead-free reflow, its 260°C peak temperature rating and glass-body construction align with J-STD-020 moisture sensitivity Level 1 - making it suitable for controlled lead-free assembly with appropriate preheat profiles.

What is the temperature coefficient of HZ33-1LTD-E near its operating voltage?

Per Figure 2 in the Renesas datasheet, the HZ33-1LTD-E exhibits a zener voltage temperature coefficient (γ_Z) of approximately −0.04 %/°C at 33 V. This translates to a drift of about −13.2 mV/°C, enabling predictable compensation in temperature-critical reference designs across −40°C to +85°C ambient conditions.