Renesas HZ6A2J

Overview

HZ6A2J from Renesas is a silicon planar Zener diode engineered for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 5.45 V (min 5.3 V / max 5.6 V), 400 mW power dissipation, 80 Ω dynamic impedance at 0.5 mA test current, and DO-35 glass package with orange body and navy-blue cathode band. It serves in stabilized reference supplies for instrumentation amplifiers and sensor signal conditioning.

For engineers reviewing the HZ6A2J datasheet, HZ6A2J pinout, HZ6A2J application, or HZ6A2J equivalent, key selection criteria include zener voltage tolerance, low noise performance versus standard HZ series, temperature coefficient behavior near 5.5 V, and compatibility with through-hole PCB layouts requiring DO-35 footprint and 175°C junction rating.

Technical Context

The HZ6A2J operates as a two-terminal voltage reference device using silicon planar junction technology optimized for reduced flicker and thermal noise-documented at approximately 1/3–1/10 that of legacy HZ-series diodes. Its zener breakdown mechanism is stable under DC bias at 0.5 mA, with specified reverse leakage ≤1 μA at VR = 2.0 V.

Thermal design relies on its DO-35 package's 175°C maximum junction temperature and −55°C to +175°C storage range, while voltage regulation accuracy is maintained via low dynamic impedance (80 Ω) and tight VZ tolerance (±0.15 V at 25°C), enabling use in low-drift analog references where noise and stability are critical.

Key Specifications

Pinout & Package

Package: DO-35 glass axial package (RENESAS code GRZZ0002ZB-A, JEITA code SC-40), orange body with navy-blue cathode band, mass 0.13 g, dimensions φD = 2.0 mm, E = 4.2 mm, L = 26.0 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4728A and BZX55-C5V6, the HZ6A2J offers uniquely specified low-noise performance and tighter V_Z binning (5.3–5.6 V) in a 400 mW DO-35 package-making it the only choice among the three for precision analog references demanding both voltage accuracy and spectral purity.

Availability

HZ6A2J is available at Aetrix Electronics and suitable for instrumentation amplifier reference, temperature sensor biasing, ADC voltage reference buffering, and low-drift op-amp compensation requiring stable component supply across industrial and medical electronics programs.

Supply support for HZ6A2J 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 devices, and precision analog components for industrial, automotive, and infrastructure markets.

The HZ-L Series-including HZ6A2J-is designed specifically for low-noise voltage reference applications in high-fidelity analog signal chains, emphasizing reduced flicker noise, tight zener voltage binning, and thermal stability in compact DO-35 packages.

FAQ

What is the exact zener voltage range for HZ6A2J at 25°C?

The HZ6A2J has a guaranteed zener voltage range of 5.3 V minimum to 5.6 V maximum when tested at I_Z = 0.5 mA and T_a = 25°C. This ±0.15 V tolerance enables precise 5.45 V nominal reference generation without external trimming, supporting high-accuracy analog designs where voltage stability is critical. The HZ6A2J achieves this via factory binning within the HZ-L series' tight specification limits.

Does HZ6A2J have documented low-noise performance compared to standard Zener diodes?

Yes, the HZ6A2J datasheet explicitly states its noise level is approximately 1/3 to 1/10 that of the legacy HZ series. This low-noise characteristic results from optimized silicon planar junction processing and is validated under DC test conditions. For sensitive applications like ECG front-ends or high-resolution ADC references, the HZ6A2J delivers measurably lower RMS voltage noise than generic Zeners-making it a purpose-built solution rather than a general-purpose part.

What is the maximum power dissipation and thermal limit for HZ6A2J?

The HZ6A2J has a maximum power dissipation of 400 mW at ambient temperature T_a = 25°C and a maximum junction temperature of 175°C. Derating is required above 25°C per the published curve in Figure 3 of the datasheet, with usable power dropping to ~200 mW at 75°C ambient. Its DO-35 package supports reliable operation in industrial environments where board-level temperatures reach 125°C, provided layout provides adequate copper area for heat conduction.

Is HZ6A2J compatible with standard DO-35 footprint and soldering processes?

Yes, the HZ6A2J uses the industry-standard DO-35 glass axial package (RENESAS code GRZZ0002ZB-A, JEITA SC-40), with body diameter 2.0 mm, lead spacing 4.2 mm, and overall length 26.0 mm. It is compatible with standard wave-soldering, hand-soldering, and reflow profiles for through-hole components. The navy-blue cathode band and orange body provide clear polarity identification during assembly, ensuring correct orientation in shunt regulator configurations.

How does the dynamic impedance of HZ6A2J affect its regulation performance?

The HZ6A2J specifies a maximum dynamic impedance (r_d) of 80 Ω at I_Z = 0.5 mA, meaning its output voltage changes by ≤40 mV for a 0.5 mA load current step. This low r_d ensures minimal regulation error in low-current reference applications such as biasing sensor bridges or driving op-amp inputs. Unlike higher-impedance Zeners, the HZ6A2J maintains stable voltage under small-signal load variations-directly improving accuracy in precision analog signal paths.