Renesas HZ22-2L-E

Overview

HZ22-2L-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 22.1 V (min 21.6 V, max 22.6 V), dynamic resistance of 20.0 Ω at 0.5 mA, maximum power dissipation of 400 mW, and junction temperature rating up to 175°C - deployed in stabilized power supplies and reference circuits requiring stable DC bias.

For engineers reviewing the HZ22-2L-E datasheet, HZ22-2L-E pinout, HZ22-2L-E application, or HZ22-2L-E equivalent, key selection criteria include zener voltage tolerance (±2.3%), low noise performance (1/3–1/10 of standard HZ series), DO-35 package compatibility, thermal stability (−0.06 %/°C tempco near 22 V), and suitability for low-current reference designs where leakage and impedance critically affect accuracy.

Technical Context

The HZ22-2L-E operates as a two-terminal voltage reference device using silicon planar junction technology optimized for reduced flicker and thermal noise. Its zener breakdown mechanism is stabilized by precise doping control and low-leakage passivation, enabling consistent regulation under sub-mA bias conditions.

Designed for DC-regulated operation only, it exhibits a zener voltage temperature coefficient of −0.06 %/°C (≈ −13.2 mV/°C) at 22 V, and maintains dynamic resistance below 20 Ω across its specified test current range (0.5–1 mA), supporting high-PSRR analog subsystems.

Key Specifications

Pinout & Package

Package: DO-35 glass axial package (JEITA code GRZZ0002ZB-A, Renesas SC-40), orange body color, navy blue cathode band. Dimensions: 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 diode applications.

Compared with BZX85C22 and 1N5248B, the HZ22-2L-E delivers superior noise performance and tighter regulation at 0.5 mA bias, making it the preferred choice for precision analog reference and low-level signal conditioning - though its 400 mW limit requires careful thermal design in high-current applications.

Availability

HZ22-2L-E is available at Aetrix Electronics and suitable for stabilized power supplies, precision voltage references, low-noise audio circuits, and industrial sensor interfaces requiring stable component supply with traceable sourcing and long-term lifecycle support.

Supply support for HZ22-2L-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 leader specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.

The HZ-L Series was developed specifically for low-noise, high-stability voltage reference applications in precision analog systems - emphasizing reduced flicker noise, tight zener voltage tolerance, and robust thermal performance in miniature DO-35 packages.

FAQ

What is the nominal zener voltage of the HZ22-2L-E and how tightly is it specified?

The HZ22-2L-E has a nominal zener voltage of 22.1 V, with a guaranteed range of 21.6 V (min) to 22.6 V (max) at I_Z = 0.5 mA. This ±2.3% tolerance enables accurate voltage setting in precision reference circuits without trimming. The specification is verified per Renesas REJ03G0182-0300 Rev.3.00, and applies strictly to the HZ22-2L-E variant within the HZ-L family.

Does the HZ22-2L-E support AC or pulsed operation?

No - the HZ22-2L-E is characterized and rated exclusively for DC operation, as explicitly stated in the datasheet note: "Tested with DC." Its electrical characteristics, including dynamic resistance and noise performance, are validated only under steady-state reverse-bias conditions. Using the HZ22-2L-E in AC-coupled or fast-switching applications is not supported by Renesas specifications.

What is the maximum allowable reverse current for stable regulation of the HZ22-2L-E?

The HZ22-2L-E is tested and specified at I_Z = 0.5 mA for zener voltage and dynamic resistance, with a maximum recommended I_Z of 1 mA per the Electrical Characteristics table. Exceeding 1 mA risks exceeding the 400 mW power limit at elevated ambient temperatures and may degrade long-term stability. The HZ22-2L-E must be operated within this DC current envelope to maintain its specified regulation accuracy and noise performance.

How does the noise performance of the HZ22-2L-E compare to standard Zener diodes?

The HZ22-2L-E achieves approximately 1/3 to 1/10 the noise level of conventional HZ-series Zeners due to proprietary planar junction processing and low-leakage passivation. This reduction is measured and confirmed in Renesas' characterization for the HZ-L Series, directly benefiting low-level analog circuits such as microphone preamps and high-resolution sensor interfaces where noise floor determines system resolution.

Is the HZ22-2L-E RoHS compliant and halogen-free?

Yes - the HZ22-2L-E meets RoHS Directive 2011/65/EU requirements and is halogen-free per Renesas' material declarations. The DO-35 glass package contains no lead in solderable terminations, and all internal materials comply with JEDEC JS709E and IEC 61249-2-21 standards. Full compliance documentation is available through Renesas' official product page and material disclosure reports for HZ-L Series.