Renesas HZ12B2L-E

Overview

HZ12B2L-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 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 - used in reference supplies for ADCs, sensor signal conditioning, and low-drift instrumentation amplifiers.

For engineers reviewing the HZ12B2L-E datasheet, HZ12B2L-E pinout, HZ12B2L-E application, or HZ12B2L-E equivalent, key selection criteria include its verified low-noise performance (1/3–1/10 lower than standard HZ series), DO-35 package compatibility, zener voltage tolerance (±0.5 V), temperature coefficient behavior near 0 mV/°C, and suitability for stable 12 V reference designs requiring minimal thermal drift.

Technical Context

This device operates as a two-terminal voltage reference using controlled avalanche breakdown in a silicon planar structure. Its low noise stems from optimized doping profile and junction geometry, and it exhibits a near-zero temperature coefficient around 12.6–13.1 V, confirmed by Figure 2 in REJ03G0182-0300 Rev.3.00.

Rated for DC operation only, the HZ12B2L-E delivers stable regulation under reverse-bias conditions with 0.5 mA test current, 1 μA max reverse leakage at VR = 10.5 V, and thermal derating per Figure 3 - supporting operation from −55°C to +175°C ambient when mounted on standard PCB traces.

Key Specifications

Pinout & Package

Package: DO-35 (JEITA code GRZZ0002ZB-A), glass axial leaded case with orange body and navy-blue cathode band. Dimensions per Page 5: φD = 2.0 mm, L = 26.0 mm, E = 4.2 mm, mass ≈ 0.13 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4742A and BZX84-C12, the HZ12B2L-E provides superior low-noise performance and tighter voltage tolerance at 400 mW, making it preferred for precision analog signal chains where thermal drift and spectral purity directly impact measurement accuracy.

Availability

HZ12B2L-E is available at Aetrix Electronics and suitable for instrumentation reference, ADC voltage reference, and sensor signal conditioning applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.

Supply support for HZ12B2L-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 for industrial, automotive, and infrastructure markets.

The HZ-L Series was designed specifically for low-noise, high-stability voltage reference applications in precision analog systems - targeting instrumentation, test equipment, and sensor interface circuits where conventional Zeners introduce unacceptable noise or drift.

FAQ

What is the exact zener voltage range for HZ12B2L-E?

The HZ12B2L-E has a guaranteed zener voltage range of 12.6 V to 13.1 V when tested at I_Z = 0.5 mA and T_a = 25°C, as specified in Table on Page 3 of REJ03G0182-0300 Rev.3.00. This tight 0.5 V window supports high-accuracy reference design without trimming. The HZ12B2L-E achieves this via controlled planar junction processing and screening.

Is HZ12B2L-E suitable for surface-mount assembly?

No - the HZ12B2L-E uses a DO-35 glass axial package with 26 mm lead length and 2.0 mm body diameter, intended for through-hole mounting only. It is not compatible with reflow or wave soldering processes used for SMT. For SMT alternatives, consider Renesas' HZ-L Series SMD variants or consult the full HZ-L family datasheet for package options.

Does HZ12B2L-E have a specified noise voltage value?

The HZ12B2L-E datasheet does not list an absolute noise voltage (nV/√Hz), but states its noise level is "approximately 1/3–1/10 lower than the HZ series" (Page 1). This comparative specification is validated across the HZ-L family and confirmed in Renesas' characterization reports. The HZ12B2L-E inherits this low-noise benefit due to its shared planar structure and optimized doping.

What is the maximum reverse leakage current for HZ12B2L-E?

The maximum reverse leakage current for HZ12B2L-E is 1 μA at V_R = 10.5 V and T_a = 25°C, per the Electrical Characteristics table on Page 3 of REJ03G0182-0300 Rev.3.00. This low leakage supports high-impedance reference nodes and extends battery life in portable instrumentation using the HZ12B2L-E.

Can HZ12B2L-E replace standard 12 V Zener diodes like 1N4742A?

The HZ12B2L-E is not a direct drop-in replacement for 1N4742A due to differences in zener voltage (12.6–13.1 V vs. 12.0 V ±5%), package (DO-35 vs. DO-41), and thermal characteristics. While both regulate near 12 V, the HZ12B2L-E targets low-noise precision use cases, whereas 1N4742A serves general-purpose regulation. System validation is required before substituting HZ12B2L-E in existing 1N4742A designs.