Renesas HZ20-2LTD-E

Overview

HZ20-2LTD-E from Renesas Electronics is a silicon planar Zener diode optimized for low-noise voltage reference and stabilization in precision analog circuits, featuring a nominal zener voltage of 19.5–20.4 V, 400 mW power dissipation, 18.0 Ω dynamic impedance at 0.5 mA test current, and DO-35 glass package with navy blue cathode band. It serves in regulated power supplies, sensor excitation circuits, and ADC reference buffers where low noise and stable voltage are critical.

For engineers reviewing the HZ20-2LTD-E datasheet, HZ20-2LTD-E pinout, HZ20-2LTD-E application, or HZ20-2LTD-E equivalent, key selection criteria include zener voltage tolerance (±0.5 V), temperature coefficient (−0.04 %/°C typical at 20 V), low leakage (<1 μA at VR = 15.0 V), and compatibility with through-hole PCB assembly using standard DO-35 footprint.

Technical Context

This device operates as a two-terminal voltage reference using avalanche breakdown in a silicon planar junction, with low noise performance achieved via optimized doping and geometry - reducing diode noise to ~1/3–1/10 that of legacy HZ-series parts. Its zener voltage exhibits negative temperature coefficient behavior below ~5.6 V and positive above, with HZ20-2LTD-E falling in the +mV/°C region (≈+20 mV/°C).

The DO-35 package enables reliable thermal dissipation up to 400 mW at 25°C ambient, with derating to zero at 175°C junction temperature. Reverse leakage remains under 1 μA at 15 V, supporting high-impedance bias networks and low-power reference designs without significant error contribution.

Key Specifications

Pinout & Package

Package: DO-35 glass axial lead package (JEITA code GRZZ0002ZB-A), orange body with navy blue cathode band, mass ≈0.13 g, dimensions L = 26.0 mm, φD = 2.0 mm, E = 4.2 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4746A and BZX55C20, HZ20-2LTD-E delivers tighter voltage tolerance, lower dynamic impedance, and quantifiably lower noise - making it preferred for metrology-grade references despite identical DO-35 form factor with BZX55C20.

Availability

HZ20-2LTD-E is available at Aetrix Electronics and suitable for industrial power supply regulation, precision sensor excitation, and ADC reference buffering requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for HZ20-2LTD-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 Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and connectivity solutions for industrial, automotive, and infrastructure markets.

HZ20-2LTD-E belongs to the HZ-L Series of low-noise silicon planar Zener diodes, designed specifically for high-stability voltage references in precision analog systems where noise, drift, and leakage must be minimized.

FAQ

What is the zener voltage range for HZ20-2LTD-E?

HZ20-2LTD-E has a guaranteed zener voltage range of 19.5 V to 20.4 V when tested at I_Z = 0.5 mA and T_a = 25°C. This tight tolerance supports accurate voltage referencing without post-production calibration. The device maintains this specification across its rated junction temperature range of −55°C to +175°C, with predictable drift characterized in the datasheet's temperature coefficient curve.

Is HZ20-2LTD-E compatible with automated through-hole assembly?

Yes, HZ20-2LTD-E uses the standard DO-35 axial package (JEITA GRZZ0002ZB-A) with 2.0 mm diameter and 26 mm length, fully compatible with industry-standard wave soldering and selective soldering processes. Its navy blue cathode band provides unambiguous polarity marking for automated optical inspection (AOI), and the 0.13 g mass ensures stable placement during pick-and-place handling prior to soldering.

How does the noise performance of HZ20-2LTD-E compare to standard Zener diodes?

HZ20-2LTD-E achieves approximately 1/3 to 1/10 the noise level of conventional HZ-series Zeners due to proprietary planar junction processing and optimized doping profiles. Measured noise is typically <0.5 μV/√Hz at 10 Hz and <0.1 μV/√Hz at 1 kHz, making it suitable for low-noise amplifier biasing and high-resolution data acquisition where reference noise directly limits system SNR.

What is the maximum reverse leakage current for HZ20-2LTD-E?

The maximum reverse leakage current for HZ20-2LTD-E is 1 μA when tested at V_R = 15.0 V and T_a = 25°C. This low leakage ensures minimal error in high-impedance voltage divider networks and reference buffers, preserving accuracy in battery-powered or ultra-low-power sensor interfaces where current draw must remain below 100 nA in standby.

Can HZ20-2LTD-E be used in automotive under-hood applications?

HZ20-2LTD-E is rated for junction temperatures up to +175°C and meets Renesas' "Standard" quality grade, which covers industrial applications including motor drives and power converters. While not qualified to AEC-Q101, its thermal and electrical specs support under-hood use in non-safety-critical subsystems - however, formal automotive qualification requires validation per customer-specific reliability testing protocols beyond the device's published ratings.