Renesas HZ5BLL90

Overview

HZ5BLL90 from Renesas is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 9.0 V ±5%, 400 mW power dissipation, 60 Ω dynamic impedance at 0.5 mA test current, and junction temperature rating up to 175°C - deployed in reference voltage generators and low-drift sensor signal conditioning.

For engineers reviewing the HZ5BLL90 datasheet, HZ5BLL90 pinout, HZ5BLL90 application, or HZ5BLL90 equivalent, key selection criteria include zener voltage tolerance, noise performance relative to legacy HZ series, thermal derating behavior above 25°C, and DO-35 package compatibility with through-hole PCB layouts.

Technical Context

The HZ5BLL90 belongs to the HZ-L Series, engineered specifically to reduce diode noise by 67–90% versus standard HZ-series Zeners. Its low leakage and tightly controlled zener voltage (9.0 V min/9.4 V max) enable stable biasing in high-gain amplifier stages and precision ADC references.

It operates with a reverse test current of 0.5 mA, exhibits a zener voltage temperature coefficient of approximately −0.02 %/°C near 9 V (per Fig.2), and maintains low dynamic resistance (60 Ω max) under DC conditions - confirming suitability for low-drift, low-power stabilization where thermal drift and AC noise must be minimized.

Key Specifications

Pinout & Package

Package: DO-35 (JEITA code GRZZ0002ZB-A), glass axial leaded package with orange body and navy-blue cathode band; total mass ≈0.13 g; lead spacing 26.0 mm min per datasheet drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4739A and BZX85C9V1, the HZ5BLL90 trades higher power rating for significantly lower noise and tighter thermal drift control - making it uniquely suited for high-fidelity analog systems where signal integrity outweighs raw power capacity.

Availability

HZ5BLL90 is available at Aetrix Electronics and suitable for precision analog reference generation, low-noise sensor excitation, and industrial-grade voltage stabilization requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HZ5BLL90 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 Technology Corp. is a Japanese semiconductor manufacturer specializing in microcontrollers, analog mixed-signal ICs, and power management solutions for industrial, automotive, and infrastructure markets.

The HZ-L Series was designed explicitly for low-noise voltage reference applications in high-precision analog systems - addressing limitations in noise, temperature coefficient, and dynamic impedance found in earlier Zener families like the standard HZ series.

FAQ

What is the exact zener voltage range for HZ5BLL90 at 0.5 mA test current?

The HZ5BLL90 has a guaranteed zener voltage range of 9.0 V (minimum) to 9.4 V (maximum) when tested at I_Z = 0.5 mA and T_a = 25°C, per the Electrical Characteristics table on page 2 of REJ03G0182-0300 Rev.3.00. This 4.4% tolerance reflects the "L" grade's tighter specification versus standard HZ-series devices. The HZ5BLL90 achieves this via process-controlled doping and low-noise junction design.

Is HZ5BLL90 compatible with standard DO-35 footprint and soldering profiles?

Yes, the HZ5BLL90 uses the JEITA-standard DO-35 package (Renesas code GRZZ0002ZB-A), identical in dimensions and lead spacing to industry-standard DO-35 Zeners. Its glass body and axial leads support conventional wave or hand-soldering with peak temperatures ≤300°C for ≤3 seconds. The HZ5BLL90's 0.13 g mass and 26.0 mm minimum lead length align with IPC-7351B Class L requirements for through-hole placement.

How does the noise performance of HZ5BLL90 compare to generic 9.1 V Zeners like 1N4739A?

The HZ5BLL90 delivers approximately 1/3 to 1/10 the broadband noise of standard HZ-series Zeners, as confirmed in the Features section of REJ03G0182-0300. In contrast, the 1N4739A provides no noise specification and uses conventional planar construction. This makes the HZ5BLL90 uniquely suitable for audio preamps and precision instrumentation where diode noise directly impacts system SNR - a distinction clearly documented for the HZ5BLL90 but absent for generic alternatives.

What is the maximum allowable reverse current before zener breakdown in HZ5BLL90?

The HZ5BLL90 specifies a maximum reverse current I_R of 1 μA at V_R = 7.2 V (i.e., 80% of nominal V_Z), per the Electrical Characteristics table. This low leakage ensures minimal error current in high-impedance reference dividers. At voltages below 7.2 V, reverse current remains well below 1 μA - critical for maintaining accuracy in battery-powered or ultra-low-power sensor nodes using the HZ5BLL90.

Does HZ5BLL90 support operation above 100°C ambient temperature?

Yes, the HZ5BLL90 is rated for storage and operation from −55°C to +175°C junction temperature. Its derated power dissipation curve (Fig.3, page 4) shows usable P_d ≥150 mW up to +100°C ambient, assuming standard PCB copper area. For sustained +105°C ambient use, thermal design must limit junction temperature to ≤175°C - achievable with ≥1 cm² of 1-oz copper pour. The HZ5BLL90's specification explicitly covers this extended range, unlike many commercial-grade Zeners.