Renesas HZ12B2J-E

Overview

HZ12B2J-E from Renesas is a silicon planar Zener diode engineered for low-noise voltage regulation in precision analog circuits, with a nominal zener voltage of 12.6–13.1 V, dynamic resistance of 80 Ω at 0.5 mA, maximum power dissipation of 400 mW, and junction temperature rating up to 175°C - deployed in reference supplies for ADCs, sensor signal conditioning, and low-drift instrumentation amplifiers.

For engineers reviewing the HZ12B2J-E datasheet, HZ12B2J-E pinout, HZ12B2J-E application, or HZ12B2J-E equivalent, key selection criteria include its verified low-noise performance (≈1/3–1/10 of standard HZ series), tight zener voltage tolerance, DO-35 package thermal profile, and temperature coefficient behavior across 12.6–13.1 V operation.

Technical Context

This device operates as a two-terminal shunt regulator using silicon planar junction technology optimized for reduced flicker and thermal noise generation. Its zener voltage is specified under DC test conditions at 0.5 mA, with dynamic resistance measured at 1 mA, ensuring stable regulation in low-current biasing configurations.

The HZ12B2J-E exhibits a negative temperature coefficient in the 12–13 V range (≈−0.04 %/°C per Fig.2), enabling predictable drift compensation when paired with positive-TC components. It is rated for continuous operation up to 175°C junction temperature and supports storage across −55°C to +175°C.

Key Specifications

Pinout & Package

Package: DO-35 glass axial-leaded package (JEITA code SC-40), 2.0 mm diameter × 26.0 mm length, 0.13 g mass, orange body with navy-blue cathode band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4742A and BZX85C12, the HZ12B2J-E trades higher power rating and tighter nominal tolerance for verified low-noise performance, lower leakage, and DO-35 thermal profile - making it optimal for precision analog systems where signal integrity outweighs raw power capacity.

Availability

HZ12B2J-E is available at Aetrix Electronics and suitable for high-precision ADC reference design, low-drift sensor signal conditioning, and instrumentation amplifier offset calibration requiring stable component supply and consistent parametric performance across production lots.

Supply support for HZ12B2J-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 industrial, automotive, and infrastructure markets.

The HZ-L Series Zener diodes were designed specifically for low-noise, high-stability voltage reference applications in precision analog signal chains - emphasizing reduced flicker noise, tight voltage tolerance, and robust thermal performance in compact DO-35 packaging.

FAQ

What is the exact zener voltage range specified for HZ12B2J-E?

The HZ12B2J-E has a guaranteed zener voltage range of 12.6 V minimum to 13.1 V maximum, tested at 0.5 mA DC current per Renesas datasheet REJ03G0182-0300 Rev.3.00. This 0.5 V window reflects tighter binning than standard Zeners and supports accurate calibration without post-production trimming. The value is measured under strictly controlled DC conditions - not AC or pulsed test methods.

Does HZ12B2J-E have a documented low-noise specification?

Yes - the HZ-L Series, including HZ12B2J-E, is explicitly characterized for low noise: its diode noise level is approximately 1/3 to 1/10 that of the legacy HZ series, as stated in the official Renesas datasheet. This performance stems from optimized silicon planar junction processing and is validated across the full 5.2–38 V voltage range, making HZ12B2J-E suitable for sub-μV noise-sensitive analog stages.

What is the maximum power dissipation and thermal derating behavior of HZ12B2J-E?

HZ12B2J-E has a maximum power dissipation of 400 mW at 25°C ambient temperature. Derating follows a linear curve down to zero at 175°C junction temperature, with published data showing ~300 mW at 70°C ambient (Fig.3). The DO-35 package's thermal resistance (junction-to-ambient) is approximately 312.5°C/W, requiring adequate PCB copper area for sustained operation above 100°C ambient.

Is HZ12B2J-E compatible with automated optical inspection (AOI) and reflow soldering processes?

HZ12B2J-E uses a standard DO-35 glass axial package with orange body and navy-blue cathode band - fully compatible with AOI systems configured for axial leaded components. It is rated for wave and hand soldering per JEDEC J-STD-020; peak reflow temperature must not exceed 260°C for ≤10 seconds. No special pre-bake or moisture sensitivity handling is required (MSL N/A).

How does the temperature coefficient of HZ12B2J-E compare to other 12 V Zener diodes?

HZ12B2J-E exhibits a temperature coefficient of approximately −0.04 %/°C (or −5.1 mV/°C) near its nominal 12.8 V operating point, as shown in Fig.2 of the datasheet. This is more stable and predictable than generic 12 V Zeners like 1N4742A (−0.075 %/°C typical), enabling better drift compensation in mixed-TC reference designs without additional thermistors or active correction.