Renesas HZS33-2LTA-E

Overview

HZS33-2LTA-E from Renesas Electronics is a silicon planar Zener diode engineered for low-noise voltage regulation in precision analog and stabilized power supply circuits, with a nominal zener voltage of 32.2–33.6 V, dynamic resistance of 250 Ω at 0.5 mA, and maximum power dissipation of 400 mW. It features ultra-low noise performance-approximately 1/3 to 1/10 that of the legacy HZ series-and is qualified for industrial-grade applications including test equipment and office electronics.

For engineers reviewing the HZS33-2LTA-E datasheet, HZS33-2LTA-E pinout, HZS33-2LTA-E application, or HZS33-2LTA-E equivalent, key selection criteria include its low zener impedance (250 Ω), tight V_Z tolerance (±0.7 V), −0.06 %/°C temperature coefficient, 200 °C junction rating, and MHD package compatibility with 5 mm-pitch high-speed automatic insertion.

Technical Context

This device operates as a two-terminal shunt voltage reference, leveraging planar diffusion technology to achieve stable reverse breakdown with minimal noise generation. Its low leakage current (<1 μA at VR = 27 V) and controlled temperature coefficient (−0.06 %/°C) support stable regulation across ambient temperatures up to +125 °C.

The HZS33-2LTA-E is optimized for DC-biased, low-current regulation roles where spectral purity matters-such as sensor excitation, ADC reference buffering, and low-drift op-amp bias networks-not switching or surge suppression applications. It requires external current limiting and does not integrate thermal shutdown or transient protection.

Key Specifications

Pinout & Package

The HZS33-2LTA-E is housed in the MHD package (JEITA code GRZZ0002ZC-A), a radial leaded, epoxy-molded case with 2.0 mm diameter leads, 2.4 mm body width, and 26 mm overall length-designed for 5 mm pitch automated insertion and wave soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5262B and BZX84-C33, the HZS33-2LTA-E delivers tighter V_Z tolerance (±0.7 V vs. ±5%), lower dynamic resistance (250 Ω vs. ≥300 Ω), higher power handling (400 mW), and documented low-noise optimization-making it the preferred choice for precision analog reference applications where stability and spectral purity are design-critical.

Availability

HZS33-2LTA-E is available at Aetrix Electronics and suitable for test and measurement equipment, industrial sensor interfaces, audio power conditioning, and programmable logic controller analog I/O modules requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for HZS33-2LTA-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 and power devices, and system-on-chip solutions for industrial, automotive, and enterprise applications.

The HZS-L series was developed by Renesas to address demand for low-noise, high-stability Zener references in industrial instrumentation and precision analog systems-emphasizing reproducible breakdown characteristics and reduced flicker noise versus legacy HZ-family diodes.

FAQ

What is the exact zener voltage range specified for HZS33-2LTA-E?

The HZS33-2LTA-E has a guaranteed zener voltage range of 32.2 V to 33.6 V when tested at I_Z = 0.5 mA and T_a = 25 °C. This ±0.7 V tolerance reflects the "2L" variant designation within the HZS-L series and is tighter than standard ±5% Zener diodes, supporting high-accuracy voltage referencing in feedback and calibration circuits.

Does HZS33-2LTA-E support surface-mount assembly?

No, the HZS33-2LTA-E uses the radial-leaded MHD package (JEITA GRZZ0002ZC-A), designed exclusively for through-hole mounting and 5 mm pitch automated insertion. It is not compatible with reflow or wave soldering processes intended for SMD packages like SOD-123 or SOT-23. For SMT alternatives, consider MMBZ5262B or BZX84-C33-but note their higher noise and impedance.

What is the maximum allowable reverse current for continuous operation of HZS33-2LTA-E?

At 25 °C ambient, the absolute maximum power dissipation is 400 mW. With a nominal V_Z of ~33 V, this corresponds to a maximum continuous zener current of approximately 12.1 mA (I_Z = P_d/V_Z). Derating is required above 25 °C per Fig.3 in the datasheet-e.g., ~8 mA at 70 °C ambient-to maintain T_j ≤ 200 °C.

Is HZS33-2LTA-E qualified for automotive applications?

No, the HZS33-2LTA-E is classified by Renesas as a "Standard" quality grade device, intended for computers, office equipment, communications gear, test instruments, and industrial robots-not transportation or safety-critical systems. It lacks AEC-Q200 qualification and is not recommended for under-hood or chassis-mounted automotive use without additional validation.

How does the noise performance of HZS33-2LTA-E compare to generic Zener diodes?

The HZS33-2LTA-E exhibits approximately 1/3 to 1/10 the noise level of the older HZ-series Zeners, achieved via optimized planar diffusion and low-defect junction processing. This makes it suitable for low-noise applications such as precision ADC references, audio bias networks, and oscillator frequency stabilization-where conventional Zeners would inject measurable broadband or flicker noise into sensitive nodes.