Renesas HZ20-1J-E

Overview

HZ20-1J-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 19.25 V (min 18.8 V, max 19.7 V), 400 mW power dissipation, 18 Ω dynamic impedance at 0.5 mA test current, and DO-35 glass package. It serves as a stable reference in low-drift power supplies and sensor signal conditioning.

For engineers reviewing the HZ20-1J-E datasheet, HZ20-1J-E pinout, HZ20-1J-E application, or HZ20-1J-E equivalent, key selection criteria include its low noise performance (≈1/3–1/10 of standard HZ series), tight zener voltage tolerance, temperature coefficient of −0.04 %/°C near 20 V, and suitability for low-current (<1 mA) stabilized references requiring minimal thermal drift.

Technical Context

This device operates as a two-terminal shunt regulator using silicon planar junction technology to achieve low noise and stable breakdown characteristics. Its zener voltage is specified at DC test conditions (IZ = 0.5 mA), with dynamic resistance measured under the same bias, ensuring predictable regulation behavior in high-impedance feedback paths.

The HZ20-1J-E exhibits a negative temperature coefficient of −0.04 %/°C (−0.76 mV/°C) at ~20 V, enabling compensation in temperature-sensitive references. Its DO-35 package supports through-hole mounting on FR-4 PCBs with 2.0 mm body diameter and 26 mm lead length, rated for junction temperatures up to 175°C.

Key Specifications

Pinout & Package

DO-35 glass axial package with orange body color and navy-blue cathode band; leads are tinned copper, 26 mm long, 0.5 mm diameter; weight 0.13 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4746A and BZX84-C20, the HZ20-1J-E delivers superior noise performance and tighter voltage tolerance in a compact DO-35 package, making it the preferred choice for high-fidelity analog references where thermal stability and spectral purity are critical.

Availability

HZ20-1J-E is available at Aetrix Electronics and suitable for instrumentation reference design, low-noise audio supply regulation, and sensor signal conditioning requiring stable component supply and long-lifecycle availability.

Supply support for HZ20-1J-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 IoT applications.

The HZ-L Series was designed specifically for low-noise, low-drift voltage reference applications in precision analog systems, emphasizing zener stability, thermal predictability, and spectral purity over general-purpose regulation.

FAQ

What is the zener voltage tolerance of HZ20-1J-E?

The HZ20-1J-E has a zener voltage range of 18.8 V to 19.7 V at I_Z = 0.5 mA, corresponding to a ±2.5% tolerance about the nominal 19.25 V value. This tight specification supports high-accuracy voltage references without post-manufacturing trimming. The HZ20-1J-E maintains this tolerance across its rated operating temperature range when used within absolute maximum ratings.

Is HZ20-1J-E suitable for surface-mount assembly?

No, the HZ20-1J-E uses a DO-35 glass axial package intended for through-hole mounting only. Its 26 mm leads and 2.0 mm body diameter are incompatible with reflow soldering profiles and pick-and-place equipment. For SMT alternatives, consider the BZX84-C20 - though it lacks the low-noise performance and tight tolerance of the HZ20-1J-E.

What is the maximum reverse leakage current for HZ20-1J-E?

The HZ20-1J-E specifies a maximum reverse leakage current (I_R) of 1 μA at V_R = 15 V and T_a = 25°C. This low leakage ensures minimal error in high-impedance reference divider networks and preserves accuracy in micropower sensor interfaces. The HZ20-1J-E maintains sub-microamp leakage even at elevated temperatures up to 125°C.

How does the temperature coefficient of HZ20-1J-E affect long-term stability?

The HZ20-1J-E exhibits a temperature coefficient of −0.04 %/°C (−0.76 mV/°C) near 20 V, resulting in predictable, linear drift over temperature. Over a −40°C to +85°C range, total zener voltage shift is approximately ±50 mV - well within tolerance for most precision analog applications. This behavior is documented in Figure 2 of the HZ20-1J-E datasheet.

Can HZ20-1J-E replace standard HZ-series zeners directly?

Yes, the HZ20-1J-E is a drop-in replacement for HZ20-1L in the same DO-35 package, offering identical pinout, voltage range, and power rating but with significantly reduced noise (≈1/3–1/10 of standard HZ series). No PCB changes are required; however, system-level noise measurements should confirm the improvement aligns with design goals for the HZ20-1J-E.