Renesas HZ9A2L-J-E

Overview

HZ9A2L-J-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 7.9–8.3 V, 400 mW power dissipation, 60 Ω dynamic resistance at 0.5 mA, and DO-35 glass package. It serves as a stable reference in low-drift power supplies and sensor biasing networks where noise suppression is critical.

For engineers reviewing the HZ9A2L-J-E datasheet, HZ9A2L-J-E pinout, HZ9A2L-J-E application, or HZ9A2L-J-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 ~8 V), and suitability for space-constrained PCB layouts requiring DO-35 footprint compatibility.

Technical Context

The HZ9A2L-J-E operates as a two-terminal voltage reference device using silicon planar junction technology, designed specifically to minimize broadband noise generation during reverse-biased conduction. Its zener voltage is specified at 0.5 mA test current with DC excitation, and it exhibits low leakage (<1 μA at VR = 2.0 V) and low dynamic impedance (60 Ω max).

This device targets applications requiring stable DC reference under varying thermal conditions, leveraging its zener voltage temperature coefficient curve that crosses zero near 8 V - confirmed by Figure 2 on page 4 of REJ03G0182-0300 - and maintains junction temperature up to 175°C with storage range from −55°C to +175°C.

Key Specifications

Pinout & Package

Package: DO-35 glass axial lead package (JEITA code GRZZ0002ZB-A), orange body with navy blue cathode band; dimensions per SC-40 standard (L ≈ 26 mm, φD ≈ 2.0 mm, φb ≈ 0.5 mm); mass ≈ 0.13 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4733A and BZX84-C8V2, the HZ9A2L-J-E delivers uniquely low noise and tighter V_Z tolerance in a proven through-hole package, making it the preferred choice when reference stability and spectral purity are design-critical - especially in audio, metrology, and sensor signal chains.

Availability

HZ9A2L-J-E is available at Aetrix Electronics and suitable for industrial power supply reference, precision sensor biasing, audio signal conditioning, and test & measurement equipment calibration requiring stable component supply and long-lifecycle support.

Supply support for HZ9A2L-J-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 manufacturer specializing in microcontrollers, analog & power devices, and system-on-chip solutions for industrial, automotive, and infrastructure markets.

The HZ-L Series was developed by Renesas to address demand for ultra-low-noise Zener references in high-fidelity analog signal paths and precision measurement systems where conventional diodes introduce unacceptable noise floor degradation.

FAQ

What is the exact zener voltage range for HZ9A2L-J-E?

The HZ9A2L-J-E has a guaranteed zener voltage range of 7.9 V to 8.3 V when tested at I_Z = 0.5 mA and T_a = 25°C, as specified in the Electrical Characteristics table on page 2 of REJ03G0182-0300. This 0.4 V window reflects tight process control for precision reference applications, and the HZ9A2L-J-E must be operated within this range to meet its published dynamic resistance and noise specifications.

Does HZ9A2L-J-E have a documented low-noise advantage over standard Zeners?

Yes - the HZ9A2L-J-E datasheet explicitly states its noise level is approximately 1/3 to 1/10 lower than the legacy HZ series, verified through comparative measurements under identical test conditions. This low-noise performance is intrinsic to the HZ-L Series' silicon planar structure and processing, and the HZ9A2L-J-E inherits this benefit as a member of that family.

What is the maximum allowable power dissipation for HZ9A2L-J-E?

The absolute maximum power dissipation for HZ9A2L-J-E is 400 mW at T_a = 25°C, as defined in the Absolute Maximum Ratings table on page 2 of REJ03G0182-0300. Derating is required above 25°C ambient, following the curve in Figure 3 (page 4), where dissipation drops linearly to zero at 150°C ambient - confirming the HZ9A2L-J-E's suitability for thermally demanding industrial enclosures.

Is HZ9A2L-J-E compatible with standard DO-35 footprint layouts?

Yes - the HZ9A2L-J-E uses the industry-standard DO-35 glass axial package (JEITA code GRZZ0002ZB-A), with mechanical dimensions matching SC-40 specifications: body diameter ~2.0 mm, length ~26 mm, lead diameter ~0.5 mm. Its orange body with navy blue cathode band allows visual identification, and the HZ9A2L-J-E fits existing DO-35 land patterns without modification.

What is the dynamic resistance specification for HZ9A2L-J-E?

The dynamic resistance (r_d) of HZ9A2L-J-E is specified as ≤60 Ω when measured at I_Z = 0.5 mA and T_a = 25°C, per the Electrical Characteristics table on page 2 of REJ03G0182-0300. This low r_d value ensures minimal output voltage shift under changing load conditions, a key requirement for maintaining accuracy in precision reference circuits using the HZ9A2L-J-E.