Renesas HZU5.1B2JTRF

Overview

HZU5.1B2JTRF from Renesas Electronics is a silicon epitaxial planar Zener diode optimized for hard-knee, low-noise voltage reference applications, with nominal Zener voltage 4.8 V (min) to 5.0 V (max) at I_Z = 0.5 mA, dynamic resistance 380 Ω (typ), and ultra-small URP package (SC-76A). It delivers stable regulation in precision analog front-ends and low-power sensor biasing circuits.

For engineers reviewing the HZU5.1B2JTRF datasheet, HZU5.1B2JTRF pinout, HZU5.1B2JTRF application, or HZU5.1B2JTRF equivalent, key selection criteria include its 1/3–1/10 lower noise voltage versus standard HZU series, ~50% reduced temperature coefficient, semi-logarithmic V_Z-I_Z linearity down to 1 nA, and surface-mount URP footprint compatibility.

Technical Context

The HZU5.1B2JTRF operates as a two-terminal shunt voltage reference with hard-knee Zener breakdown characteristics, enabling precise low-current regulation without external bias circuitry. Its V_Z-I_Z curve remains semi-logarithmic linear across 1 nA to 1 mA, supporting accurate modeling in sub-microamp bias networks.

Designed for ambient temperatures from −55°C to +150°C, it maintains Zener voltage stability under thermal stress with a typical temperature coefficient of −0.02 mV/°C (≈−0.004%/°C), verified at V_Z ≈ 4.9 V - significantly lower than legacy HZU-series parts.

Key Specifications

Pinout & Package

Package: Ultra Small Resin Package (URP), JEITA code PTSP0002ZA-A, SC-76A outline, mass 0.004 g, compatible with standard SMT reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C5V1 and MMSZ5231B, the HZU5.1B2JTRF provides uniquely verified nanoamp-level V_Z linearity, 3× lower noise, and half the temperature coefficient - making it the only option qualified for high-fidelity analog signal chains where reference stability dominates system error budget.

Availability

HZU5.1B2JTRF is available at Aetrix Electronics and suitable for high-precision sensor biasing, low-power analog front-end reference, and portable instrumentation power management requiring stable component supply and consistent parametric performance across production lots.

Supply support for HZU5.1B2JTRF 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 manufacturer specializing in microcontrollers, analog and power devices, and advanced SoCs for automotive, industrial, and enterprise applications.

The HZU-LL series was designed specifically for low-noise, hard-knee Zener reference applications demanding superior voltage stability at nanoamp currents - targeting precision analog systems where conventional Zeners introduce unacceptable drift or noise.

FAQ

What is the exact Zener voltage range for HZU5.1B2JTRF at 0.5 mA test current?

The HZU5.1B2JTRF has a specified Zener voltage range of 4.8 V (minimum) to 5.0 V (maximum) when tested at I_Z = 0.5 mA, per Renesas datasheet REJ03G1216-0500 Rev.5.00. This tight 200 mV span reflects its role as a precision 5 V-class reference, not a general-purpose 5.1 V clamp. The "5.1" in the part number denotes its position within the HZU5xLL family grouping, not its nominal voltage.

Does HZU5.1B2JTRF support operation below 1 µA, and what is its behavior at nanoamp currents?

Yes - the HZU5.1B2JTRF is explicitly characterized for semi-logarithmic V_Z-I_Z linearity from I_Z = 1 nA up to 1 mA. At 100 nA, its Zener voltage remains within specification, enabling use in ultra-low-power sensor bias networks where traditional Zeners exhibit excessive curvature or instability. This behavior is confirmed in Figure 1 of the HZU-LL datasheet.

What is the temperature coefficient of HZU5.1B2JTRF, and how does it compare to standard Zener diodes?

The HZU5.1B2JTRF exhibits a typical temperature coefficient of −0.02 mV/°C (≈−0.004%/°C) near its 4.9 V operating point, approximately half that of the legacy HZU series and significantly lower than generic 5.1 V Zeners (e.g., BZX84-C5V1 at −0.05 mV/°C). This reduced drift directly translates to <0.1% total V_Z change over −40°C to +85°C, verified in Figure 2 of the datasheet.

Is HZU5.1B2JTRF RoHS-compliant and lead-free?

Yes - HZU5.1B2JTRF is manufactured in compliance with EU RoHS Directive 2011/65/EU and is lead-free. Renesas confirms environmental compliance in its product documentation and public declarations; the URP package uses lead-free solderable terminations and halogen-free molding compound, meeting industry-standard green electronics requirements.

What is the maximum power dissipation and derating behavior of HZU5.1B2JTRF?

HZU5.1B2JTRF has a maximum power dissipation of 150 mW at T_a = 25°C, with linear derating above 25°C at 1.2 mW/°C (per Figure 3 in REJ03G1216-0500). At 75°C ambient, usable power drops to 90 mW; at 125°C, it falls to 30 mW. This derating must be applied in thermal design - especially in sealed enclosures or high-density layouts - to avoid exceeding the 150°C junction temperature limit.