Renesas HZ27-2JTA-E

Overview

HZ27-2JTA-E from Renesas is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 26.2–27.6 V at 0.5 mA test current, 400 mW power dissipation, 24.0 Ω dynamic impedance, and DO-35 glass package with navy-blue cathode band. It serves as a stable reference in low-drift power supplies and sensor biasing networks.

For engineers reviewing the HZ27-2JTA-E datasheet, HZ27-2JTA-E pinout, HZ27-2JTA-E application, or HZ27-2JTA-E equivalent, key selection criteria include zener voltage tolerance (±0.7 V), low noise performance (1/3–1/10 of standard HZ series), temperature coefficient (−0.04 %/°C typical at ~27 V), and DO-35 mechanical compatibility in space-constrained PCB layouts.

Technical Context

The HZ27-2JTA-E operates as a two-terminal voltage reference using avalanche breakdown in a planar-diffused silicon junction. Its low dynamic resistance (24.0 Ω) and tight zener voltage tolerance ensure minimal output variation under load changes up to 0.5 mA.

Designed for low-noise applications, it achieves reduced diode noise via optimized doping profile and junction geometry-distinct from standard HZ-series devices-and maintains stable operation across −55°C to +175°C storage range with 175°C maximum junction temperature rating.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5254B and BZX55-C27, the HZ27-2JTA-E delivers superior noise performance and tighter voltage tolerance at identical DO-35 footprint-making it preferred for metrology-grade references and high-fidelity analog signal chains where drift and noise directly impact measurement integrity.

Availability

HZ27-2JTA-E is available at Aetrix Electronics and suitable for instrumentation reference, industrial power monitoring, audio signal biasing, and optocoupler feedback reference applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for HZ27-2JTA-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 delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and infrastructure markets.

The HZ-L Series was developed specifically for low-noise, high-stability voltage reference applications in precision analog systems-addressing limitations of legacy Zener families in metrology, audio, and sensor signal conditioning.

FAQ

What is the exact zener voltage range specified for HZ27-2JTA-E?

The HZ27-2JTA-E has a guaranteed zener voltage range of 26.2 V to 27.6 V when tested at I_Z = 0.5 mA and T_a = 25°C. This 1.4 V window reflects the device's tight tolerance design for precision reference use, and is confirmed in Renesas document REJ03G0182-0300 Rev.3.00 on page 3. The HZ27-2JTA-E achieves this specification through controlled avalanche breakdown characteristics in its silicon planar junction.

Does HZ27-2JTA-E have a documented low-noise advantage over standard Zener diodes?

Yes-the HZ27-2JTA-E is explicitly characterized as having approximately 1/3 to 1/10 the diode noise level of the standard HZ series, per Renesas' official documentation (REJ03G0182-0300, page 1). This low-noise performance stems from proprietary junction processing and is validated for use in audio preamplifiers and precision ADC references where noise floor directly impacts system resolution. The HZ27-2JTA-E leverages this feature without requiring external filtering.

What is the maximum power dissipation and thermal limit for HZ27-2JTA-E?

The HZ27-2JTA-E has a maximum power dissipation (P_d) of 400 mW at T_a = 25°C and a maximum junction temperature (T_j) of 175°C. Derating begins above 25°C ambient, following the curve in Figure 3 of REJ03G0182-0300. At 70°C ambient, usable power drops to ~280 mW. These limits ensure robust operation in enclosed industrial enclosures where the HZ27-2JTA-E is commonly deployed as a voltage clamp or reference.

Is HZ27-2JTA-E compatible with standard DO-35 footprint and soldering processes?

Yes-the HZ27-2JTA-E uses the JEITA-standard DO-35 package (Renesas code GRZZ0002ZB-A), with 2.0 mm body diameter and 26.0 mm lead-to-lead length. It is compatible with standard axial-component reflow and hand-soldering profiles, including peak temperatures up to 260°C for ≤10 seconds. The navy-blue cathode band and orange body provide unambiguous polarity identification during HZ27-2JTA-E assembly and inspection.

How does the temperature coefficient of HZ27-2JTA-E affect long-term reference stability?

The HZ27-2JTA-E exhibits a typical zener voltage temperature coefficient (γ_Z) of −0.04 %/°C near 27 V, as shown in Figure 2 of REJ03G0182-0300. Over a 0–70°C ambient range, this results in <±0.076 V drift-well within ±0.1 V for most precision references. This predictable, low-drift behavior makes the HZ27-2JTA-E suitable for unregulated environments where active temperature compensation is impractical, and distinguishes it from higher-TC alternatives like the HZ27-1L variant.