Renesas HZ30-2L-E

Overview

HZ30-2L-E from Renesas is a silicon planar Zener diode optimized for low-noise voltage reference and stabilization in precision analog circuits, featuring a nominal zener voltage of 29.2–30.6 V at 0.5 mA, dynamic resistance of 27.0 Ω, maximum power dissipation of 400 mW, and junction temperature rating of 175°C - deployed in high-stability power supplies and sensor biasing networks.

For engineers reviewing the HZ30-2L-E datasheet, HZ30-2L-E pinout, HZ30-2L-E application, or HZ30-2L-E equivalent, key selection criteria include its low-noise performance (≈1/3–1/10 lower than standard HZ series), DO-35 package compatibility, zener voltage tolerance (±2.4 V), temperature coefficient behavior near zero crossing (~0.02 %/°C at ~30 V), and suitability for DC-stabilized references requiring minimal drift and ripple coupling.

Technical Context

The HZ30-2L-E operates as a two-terminal voltage reference device with cathode-anode polarity, relying on controlled avalanche breakdown in its silicon planar junction to maintain stable reverse-biased conduction. Its low dynamic impedance (27.0 Ω) ensures minimal output voltage variation under load current shifts, while its specified test condition of I_Z = 0.5 mA reflects typical biasing for noise-sensitive applications.

Designed for DC operation only (per datasheet note), the device exhibits a zener voltage temperature coefficient near zero (~0.02 %/°C) at its 30 V range - confirmed by Figure 2 - enabling stable reference performance across ambient temperatures up to 125°C before derating begins, per the power dissipation vs. ambient curve (Figure 3).

Key Specifications

Pinout & Package

Package: DO-35 glass axial-leaded package (Renesas JEITA code GRZZ0002ZB-A), 2.0 mm diameter × 26.0 mm length, 0.13 g mass, orange body color, navy-blue cathode band marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HZ30-2L-E, the 1N5257BRLG offers higher power headroom but greater impedance-induced regulation error, while BZX55C30 provides broader availability at lower cost but lacks the verified low-noise and tight tempco advantages essential for precision analog designs.

Availability

HZ30-2L-E is available at Aetrix Electronics and suitable for high-precision voltage reference, low-noise audio biasing, and industrial power supply regulation requiring stable component supply and long-term sourcing continuity.

Supply support for HZ30-2L-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 and power devices, and system-on-chip solutions for automotive, industrial, and infrastructure markets.

The HZ-L Series was developed specifically for low-noise, high-stability voltage reference applications in precision analog systems - emphasizing reduced diode noise, tight zener voltage tolerance, and predictable temperature coefficient behavior across the 5.2–38 V range.

FAQ

What is the exact zener voltage range for HZ30-2L-E?

The HZ30-2L-E has a guaranteed zener voltage range of 29.2 V to 30.6 V when tested at I_Z = 0.5 mA and T_a = 25°C. This 1.4 V span reflects the device's factory binning for the "2L" variant within the HZ30 family and ensures consistent performance in voltage reference designs requiring tight initial accuracy.

Is HZ30-2L-E suitable for AC-coupled or switching applications?

No - the HZ30-2L-E is explicitly rated for DC operation only, as noted in the datasheet (REJ03G0182-0300, Page 2, Note 1). It is not characterized for transient response, capacitance, or switching speed, and its low-noise optimization targets steady-state DC reference use, not dynamic or pulsed conditions.

What does the "-E" suffix indicate in HZ30-2L-E?

The "-E" suffix in HZ30-2L-E denotes the Renesas standard packaging configuration for this part: tape-and-reel delivery with 2,000 units per reel, compliant with EIA-481-D standards. It does not alter electrical specifications - all HZ30-2L-E units share identical zener voltage, dynamic resistance, and thermal ratings as the base HZ30-2L designation.

How does the noise performance of HZ30-2L-E compare to generic Zener diodes?

The HZ30-2L-E delivers approximately 1/3 to 1/10 the noise level of standard HZ-series Zeners, achieved via optimized silicon planar junction processing and low-leakage design. This verified low-noise characteristic makes HZ30-2L-E measurably superior in applications like audio preamp biasing and high-resolution ADC references where noise floor directly impacts system SNR.

Can HZ30-2L-E be used in surface-mount designs?

No - the HZ30-2L-E is packaged exclusively in the through-hole DO-35 (axial lead) format, as confirmed by Renesas package documentation (JEITA code GRZZ0002ZB-A). It has no SMD variant; designers requiring surface-mount compatibility must select alternative families such as the HZ30-2L-SMD series or evaluate discrete SOT-23 Zener options with comparable specs.