Renesas HZ33-2JTA-E

Overview

HZ33-2JTA-E from Renesas is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, with a nominal zener voltage of 32.2–33.6 V, 400 mW power dissipation, 30 Ω dynamic impedance at 0.5 mA test current, and DO-35 glass package. It serves as a stable reference in low-drift power supplies and sensor biasing networks.

For engineers reviewing the HZ33-2JTA-E datasheet, HZ33-2JTA-E pinout, HZ33-2JTA-E application, or HZ33-2JTA-E equivalent, key selection criteria include its low-noise performance (1/3–1/10 lower than standard HZ series), tight zener voltage tolerance, temperature coefficient behavior near zero crossing (~0.02 %/°C at ~33 V), and suitability for DC-stabilized references requiring minimal thermal drift.

Technical Context

The HZ33-2JTA-E employs a silicon planar junction structure with controlled doping to achieve low noise and stable zener breakdown characteristics. Its design targets DC-regulated references where low leakage (<1 μA at VR = 27 V) and predictable temperature coefficient (≈0.02 %/°C) are critical.

It operates exclusively in reverse-bias zener mode with no forward conduction specification provided. The device is rated for junction temperatures up to 175°C and requires DC test conditions per datasheet - no AC or transient specifications are defined.

Key Specifications

Pinout & Package

Package: DO-35 glass axial lead package (JEITA code GRZZ0002ZB-A, Renesas code SC-40), orange body with navy blue cathode band. Mass: 0.13 g. Dimensions: φD = 2.0 mm, L = 26.0 mm, E = 4.2 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX85C33 and 1N5259B, the HZ33-2JTA-E delivers superior noise performance, tighter voltage tolerance, and lower dynamic impedance in the same DO-35 form factor - making it optimal for precision analog reference designs where stability and spectral purity are critical.

Availability

HZ33-2JTA-E is available at Aetrix Electronics and suitable for industrial sensor conditioning, medical instrumentation biasing, high-voltage DC reference supplies, and test & measurement equipment calibration requiring stable component supply and long-term parametric consistency.

Supply support for HZ33-2JTA-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.

The HZ-L Series is part of Renesas' precision analog portfolio, engineered specifically for low-noise, low-drift DC voltage reference applications in instrumentation and sensor systems where parameter stability outweighs raw power handling.

FAQ

What is the exact zener voltage range for HZ33-2JTA-E?

The HZ33-2JTA-E has a guaranteed zener voltage range of 32.2 V minimum to 33.6 V maximum when tested at I_Z = 0.5 mA and T_a = 25°C. This 1.4 V window reflects the "2" variant within the HZ33-xL family and is tighter than standard Zener diodes, supporting accurate voltage setting without trimming. The HZ33-2JTA-E maintains this specification across its qualified operating temperature range.

Is HZ33-2JTA-E suitable for AC-coupled or high-frequency applications?

No - the HZ33-2JTA-E is characterized and specified exclusively for DC operation, with all electrical parameters (including dynamic resistance and noise) measured using DC test conditions. No AC impedance, frequency response, or switching characteristics are provided in the official Renesas datasheet REJ03G0182-0300. For AC or transient applications, the HZ33-2JTA-E should not be assumed functional without independent validation.

What is the cathode identification method on HZ33-2JTA-E?

The HZ33-2JTA-E uses a navy blue cathode band on an orange glass DO-35 body to identify the cathode terminal (Pin 1). This marking is consistent across the HZ-L Series and aligns with JEDEC-standard polarity indicators. Correct orientation is essential: reverse bias must be applied with cathode at higher potential to achieve zener breakdown; forward bias will cause conduction and possible damage if current is uncontrolled.

Does HZ33-2JTA-E have a specified noise voltage spectral density?

The Renesas datasheet REJ03G0182-0300 does not provide quantitative noise voltage spectral density (e.g., nV/√Hz) for the HZ33-2JTA-E. It states qualitatively that the HZ-L Series exhibits "approximately 1/3–1/10 lower [diode] noise level than the HZ series", based on comparative measurements under unspecified bandwidth and test conditions. No absolute noise floor or frequency-dependent data is published for the HZ33-2JTA-E.

Can HZ33-2JTA-E replace HZ33-2L in existing designs?

Yes - HZ33-2JTA-E is the JEDEC-registered orderable part number corresponding to the HZ33-2L device described in the HZ-L Series datasheet. The "JTA-E" suffix denotes tape-and-reel packaging per JIS C 0806, while electrical, thermal, and mechanical specifications are identical to HZ33-2L. No layout or schematic changes are required when substituting HZ33-2JTA-E for HZ33-2L.