Renesas HZ33-3-90TA

Overview

HZ33-3-90TA from Renesas is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 33.2–34.6 V at 0.5 mA, dynamic resistance of 250 Ω, maximum power dissipation of 400 mW, and junction temperature rating of 175 °C - deployed in stabilized power supplies and reference circuits requiring stable DC bias.

For engineers reviewing the HZ33-3-90TA datasheet, HZ33-3-90TA pinout, HZ33-3-90TA application, or HZ33-3-90TA equivalent, key selection criteria include zener voltage tolerance (±2.1% at 0.5 mA), low noise performance (1/3–1/10 of standard HZ series), DO-35 package compatibility, and thermal stability across −55 to +175 °C storage range.

Technical Context

This device operates as a two-terminal voltage reference using controlled avalanche breakdown in a silicon planar structure, with specified test conditions of DC excitation at 0.5 mA zener current and 1 mA reverse current limit. Its low dynamic impedance (250 Ω) and tight V_Z tolerance support stable regulation under light-load conditions.

The HZ33-3-90TA exhibits a negative zener voltage temperature coefficient typical of mid-voltage Zeners (~−0.06 %/°C per Fig.2), and its power derating follows a linear curve down to zero dissipation at 175 °C ambient - consistent with DO-35 package thermal limits and JEITA SC-40 mechanical constraints.

Key Specifications

Pinout & Package

Package: DO-35 (JEITA SC-40, Renesas code GRZZ0002ZB-A), glass axial body with navy blue cathode band and orange body color; mass ≈ 0.13 g; lead spacing E = 4.2 mm; body diameter φD = 2.0 mm; length L = 26.0 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5272B and BZX85C33, the HZ33-3-90TA delivers superior voltage accuracy (±2.1% vs ±5%), lower noise, and DO-35 form factor compatibility - making it optimal for compact, low-drift analog systems where reference integrity is critical.

Availability

HZ33-3-90TA is available at Aetrix Electronics and suitable for stabilized power supplies, precision instrumentation references, industrial voltage monitors, and low-noise analog biasing requiring stable component supply and long-term obsolescence management.

Supply support for HZ33-3-90TA 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 leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and enterprise applications.

The HZ-L Series Zener diodes were designed specifically for low-noise, high-stability voltage reference applications in analog signal chains and precision power systems - emphasizing noise reduction, tight V_Z tolerance, and thermal robustness.

FAQ

What is the exact zener voltage range for HZ33-3-90TA?

The HZ33-3-90TA has a guaranteed zener voltage range of 33.2 V to 34.6 V when tested at I_Z = 0.5 mA and T_a = 25 °C. This 1.4 V span reflects ±2.1% tolerance around the nominal 33.9 V center point, as specified in the Renesas REJ03G0182-0300 datasheet, Page 3.

Is HZ33-3-90TA compatible with standard DO-35 footprints?

Yes, HZ33-3-90TA uses the DO-35 package (JEITA SC-40, Renesas code GRZZ0002ZB-A) with defined dimensions: body diameter 2.0 mm, length 26.0 mm, and lead spacing 4.2 mm. It is mechanically and solder-reflow compatible with industry-standard DO-35 land patterns and assembly processes.

What is the maximum reverse current specification for HZ33-3-90TA?

The HZ33-3-90TA specifies a maximum reverse current (I_R) of 1 μA at V_R = 27 V and T_a = 25 °C. This low leakage supports high-impedance bias networks and minimizes error in precision reference dividers where current draw must be tightly controlled.

Does HZ33-3-90TA have a documented temperature coefficient?

Yes - while not explicitly listed per part number, Figure 2 in the HZ-L Series datasheet shows that 33 V-class devices exhibit a zener voltage temperature coefficient (γ_Z) of approximately −0.06 %/°C. This negative coefficient is consistent across the HZ33-xL family and enables predictable drift compensation in reference designs.

How does the noise performance of HZ33-3-90TA compare to generic Zener diodes?

HZ33-3-90TA achieves approximately 1/3 to 1/10 the noise level of standard HZ-series Zeners, as confirmed in the "Features" section of the Renesas datasheet. This ultra-low-noise characteristic stems from optimized silicon planar processing and is validated for use in high-fidelity analog circuits where broadband and 1/f noise directly impact measurement fidelity.