Renesas HZ6A1J

Overview

HZ6A1J from Renesas is a silicon planar Zener diode engineered for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 5.2–5.5 V, 400 mW power dissipation, and dynamic resistance of ≤150 Ω at 0.5 mA test current - deployed in stabilized power supplies and reference voltage generators.

For engineers reviewing the HZ6A1J datasheet, HZ6A1J pinout, HZ6A1J application, or HZ6A1J equivalent, key selection criteria include zener voltage tolerance (±0.3 V), low noise performance (1/3–1/10 lower than standard HZ series), junction temperature rating (175°C), and DO-35 package compatibility with through-hole PCB layouts.

Technical Context

The HZ6A1J operates as a two-terminal shunt regulator with DC-tested zener breakdown characteristics, optimized for low-noise operation via proprietary silicon planar processing that reduces generation-recombination noise. Its 5.2–5.5 V zener range targets mid-voltage analog references where thermal stability and ripple suppression are critical.

It exhibits a zener voltage temperature coefficient near zero (±0.02%/°C typical per Fig.2) and maintains stable regulation under reverse bias up to 400 mW, with leakage current limited to ≤1 μA at VR = 2.0 V - enabling use in high-impedance sensing and calibration circuits without loading error.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4728A and BZX55-C5V1, the HZ6A1J delivers uniquely specified low-noise operation and tighter 5.2–5.5 V tolerance in DO-35 form factor - making it the only choice for metrology-grade references where noise and voltage accuracy are co-critical.

Availability

HZ6A1J is available at Aetrix Electronics and suitable for stabilized power supplies, precision analog references, sensor excitation circuits, and industrial control systems requiring stable component supply with guaranteed long-term continuity.

Supply support for HZ6A1J 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 for industrial, automotive, and infrastructure markets.

The HZ-L Series was designed specifically for low-noise voltage reference applications in high-precision analog systems - emphasizing reduced zener noise, tight voltage tolerance, and robust thermal performance in axial-glass packaging.

FAQ

What is the exact zener voltage range specified for HZ6A1J?

The HZ6A1J has a guaranteed zener voltage range of 5.2 V to 5.5 V when tested at I_Z = 0.5 mA, as confirmed in the Renesas datasheet REJ03G0182-0300 Rev.3.00. This 0.3 V window enables predictable regulation without post-production trimming and supports designs requiring tight 5 V-class references. The HZ6A1J achieves this specification using silicon planar process technology optimized for low parametric variation.

Does HZ6A1J meet low-noise requirements for precision ADC references?

Yes - the HZ6A1J is explicitly characterized for low-noise operation, with noise level approximately 1/3 to 1/10 that of the standard HZ series. This performance is achieved through proprietary planar junction design and is validated in Renesas' characterization data. For precision ADC references, the HZ6A1J's low noise directly improves effective number of bits (ENOB) and reduces RMS noise floor in 24-bit delta-sigma converters.

What is the maximum allowable power dissipation for HZ6A1J at 75°C ambient?

Per Figure 3 in the HZ6A1J datasheet, power dissipation must be derated linearly above 25°C ambient. At 75°C, the allowable P_d is approximately 280 mW - calculated from the 400 mW rating at 25°C and the 100°C/W thermal resistance implied by the curve. This derating ensures junction temperature remains within the 175°C limit. Always verify layout thermal resistance when using HZ6A1J in enclosed industrial enclosures.

Is HZ6A1J compatible with standard DO-35 footprint and soldering profiles?

Yes - the HZ6A1J uses the JEITA-standard DO-35 package (GRZZ0002ZB-A) with 2.0 mm body diameter and 26 mm lead length. It is compatible with IPC-7095-compliant through-hole reflow and wave soldering profiles. Lead spacing matches standard 0.4 inch (10.16 mm) PCB footprints, and the navy blue cathode band provides unambiguous polarity marking during assembly.

How does the temperature coefficient of HZ6A1J compare to other 5 V zeners?

The HZ6A1J exhibits a zener voltage temperature coefficient near zero - approximately ±0.02%/°C - as shown in Figure 2 of its datasheet. This is significantly tighter than generic 5 V zeners (e.g., BZX55-C5V1 at ±0.05%/°C) and results from optimized doping and junction geometry. In practice, this means <0.1% V_Z drift over 0–70°C ambient, making HZ6A1J suitable for unregulated environments where thermal stability is critical.