Renesas HZ6B1L91TA

Overview

HZ6B1L91TA from Renesas is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, with a nominal zener voltage of 5.5 V to 5.8 V, 400 mW power dissipation, 80 Ω dynamic resistance at 0.5 mA, and DO-35 glass package. It serves as a stable reference in sensor signal conditioning and low-drift power supply feedback paths.

For engineers reviewing the HZ6B1L91TA datasheet, HZ6B1L91TA pinout, HZ6B1L91TA application, or HZ6B1L91TA equivalent, key selection criteria include zener voltage tolerance (±0.3 V), low noise performance (1/3–1/10 that of standard HZ series), junction temperature rating (175°C), and DO-35 mechanical compatibility for through-hole PCB layouts.

Technical Context

This device operates as a two-terminal shunt regulator using silicon planar junction technology, delivering stable reverse-biased breakdown with low dynamic impedance (80 Ω) at I_Z = 0.5 mA. Its low leakage current (<1 μA at V_R = 2.0 V) and tight zener voltage tolerance support high-accuracy biasing in op-amp references and ADC voltage references.

The HZ6B1L91TA exhibits a zener voltage temperature coefficient of approximately −0.04 %/°C (−2.2 mV/°C) near 5.6 V, enabling predictable drift compensation in temperature-sensitive analog front-ends. Its 175°C maximum junction temperature supports operation in industrial ambient environments without derating below 100°C.

Key Specifications

Pinout & Package

Package: DO-35 glass axial leaded package (JEITA code GRZZ0002ZB-A, Renesas code SC-40), 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 regulation applications.

Compared with BZX55C5V6 and MMSZ5232B, the HZ6B1L91TA offers superior voltage precision (±0.15 V vs. ±0.28 V), lower noise, and higher thermal robustness (175°C vs. 150°C), making it optimal for calibrated industrial sensors and high-reliability analog systems where DO-35 mounting is acceptable.

Availability

HZ6B1L91TA is available at Aetrix Electronics and suitable for industrial sensor reference, medical instrumentation power, and automotive ECU voltage monitor applications requiring stable component supply, long-term lifecycle support, and traceable sourcing from Renesas-authorized channels.

Supply support for HZ6B1L91TA 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 power devices, and timing solutions for industrial, automotive, and infrastructure markets.

The HZ-L Series Zener diodes were designed specifically for low-noise, high-stability voltage reference applications in precision analog signal chains, targeting sensor interfaces, medical instrumentation, and industrial control systems.

FAQ

What is the exact zener voltage range specified for HZ6B1L91TA?

The HZ6B1L91TA has a guaranteed zener voltage range of 5.5 V minimum to 5.8 V maximum when tested at I_Z = 0.5 mA and T_a = 25°C. This ±0.15 V tolerance is tighter than standard 5% Zener diodes and supports high-accuracy reference design without post-production calibration. The value is confirmed in Renesas document REJ03G0182-0300 Rev.3.00, Page 2.

Does HZ6B1L91TA support operation above 100°C ambient temperature?

Yes, the HZ6B1L91TA supports continuous operation up to 125°C ambient temperature with appropriate derating: its absolute maximum junction temperature is 175°C, and the package's thermal resistance (R_θJA) allows safe operation at full 400 mW dissipation below 70°C ambient, with linear derating to zero power at 175°C. This makes HZ6B1L91TA suitable for under-hood automotive and enclosed industrial environments.

How does the noise performance of HZ6B1L91TA compare to standard Zener diodes?

The HZ6B1L91TA achieves approximately 1/3 to 1/10 the noise level of conventional HZ-series Zener diodes, as stated in the Renesas datasheet features section. This reduction is achieved via optimized silicon planar junction processing and low-leakage design, directly lowering broadband voltage noise in precision reference paths-critical for high-resolution ADCs and low-noise amplifiers using HZ6B1L91TA as a voltage reference.

Is HZ6B1L91TA compatible with automated through-hole assembly processes?

Yes, the HZ6B1L91TA uses the standard DO-35 axial glass package (JEITA code GRZZ0002ZB-A) with 2.0 mm body diameter and 26 mm lead length, fully compatible with industry-standard wave soldering, selective soldering, and axial component insertion equipment. Lead spacing and mechanical dimensions match IPC-7351 requirements for DO-35 footprints, ensuring reliable placement and solder joint formation in HZ6B1L91TA-based production lines.

What is the maximum reverse current specification for HZ6B1L91TA at 2.0 V?

The maximum reverse current (I_R) for HZ6B1L91TA is 1 μA when tested at V_R = 2.0 V and T_a = 25°C, per the Electrical Characteristics table on Page 2 of REJ03G0182-0300. This low leakage ensures minimal parasitic loading on high-impedance bias networks and extends battery life in portable instrumentation using HZ6B1L91TA as a reference element.