Renesas HZ24-3L-E

Overview

HZ24-3L-E from Renesas is a silicon planar Zener diode optimized for low-noise voltage regulation, with a nominal zener voltage of 24.3–25.5 V at 0.5 mA test current, dynamic resistance of 120 Ω, maximum power dissipation of 400 mW, and junction temperature rating up to 175°C - used in precision reference and stabilized power supply circuits.

For engineers reviewing the HZ24-3L-E datasheet, HZ24-3L-E pinout, HZ24-3L-E application, or HZ24-3L-E equivalent, key selection criteria include its low-noise performance (≈1/3–1/10 of standard HZ series), tight zener voltage tolerance, DO-35 package compatibility, and thermal stability across −55°C to +175°C storage range.

Technical Context

The HZ24-3L-E operates as a two-terminal voltage reference device using silicon planar junction technology, designed specifically for low-noise analog and precision DC supply applications. Its zener voltage is specified at 0.5 mA DC test current, with dynamic resistance measured at 1 mA, and exhibits a positive temperature coefficient near +0.06 %/°C per the family's characteristic curve.

It delivers stable regulation under low-current bias conditions and maintains low leakage (<1 μA at VR = 20.2 V), low zener impedance, and consistent performance across ambient temperatures up to 75°C before derating begins - all within the DO-35 glass axial package with navy-blue cathode band marking.

Key Specifications

Pinout & Package

DO-35 glass axial package: hermetically sealed, orange body color, navy-blue cathode band. Total mass ≈ 0.13 g. Dimensions: φD = 2.0 mm max, L = 26.0 mm min, E = 4.2 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX85C24 and 1N5249B, the HZ24-3L-E offers verified low-noise operation (documented 1/3–1/10 reduction), tighter V_Z tolerance at 24.9 V nominal, and optimized thermal coefficient - making it preferred for metrology-grade and audio-critical references where noise and drift dominate design constraints.

Availability

HZ24-3L-E is available at Aetrix Electronics and suitable for precision voltage reference, low-noise analog signal conditioning, and industrial power monitoring applications requiring stable component supply and long-term parametric consistency.

Supply support for HZ24-3L-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, 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 voltage reference applications where traditional Zener diodes introduce unacceptable signal degradation.

FAQ

What is the nominal zener voltage of the HZ24-3L-E?

The HZ24-3L-E has a zener voltage range of 24.3 V to 25.5 V at a test current of 0.5 mA, with a typical value near 24.9 V. This specification is measured under DC conditions and reflects the device's precision regulation capability for reference applications - a key parameter confirmed in Renesas document REJ03G0182-0300.

Does the HZ24-3L-E have a documented low-noise advantage over standard Zener diodes?

Yes - the HZ24-3L-E belongs to the HZ-L Series, which is explicitly characterized as having noise levels approximately 1/3 to 1/10 that of the standard HZ series. This low-noise performance is a core design feature validated in Renesas' official documentation and makes the HZ24-3L-E suitable for audio and high-resolution measurement circuits where noise floor matters.

What package type and markings identify the HZ24-3L-E?

The HZ24-3L-E uses the DO-35 glass axial package (JEITA code GRZZ0002ZB-A), with an orange body and navy-blue cathode band. Pin 1 is the cathode, marked by the band; Pin 2 is the anode. The "E" suffix in HZ24-3L-E corresponds to the Renesas internal ordering variant for this specific HZ-L Series device.

What is the maximum power dissipation and derating behavior of the HZ24-3L-E?

The HZ24-3L-E has a maximum power dissipation of 400 mW at 25°C ambient temperature. Derating begins linearly above 25°C, reaching zero dissipation at 175°C junction temperature. The device's power vs. ambient temperature curve (Fig.3 in REJ03G0182-0300) confirms usable operation up to ~75°C without external heatsinking - critical for compact industrial designs.

Is the HZ24-3L-E suitable for use in precision ADC reference circuits?

Yes - the HZ24-3L-E is well-suited for precision ADC reference circuits due to its low dynamic resistance (120 Ω), low leakage (<1 μA), and stable temperature coefficient (~+0.06 %/°C). When combined with proper PCB layout and filtering, the HZ24-3L-E supports 16-bit+ ADC accuracy, as verified in Renesas' application guidance for low-drift reference design.