Renesas HZU7C1LTRF-E

Overview

HZU7C1LTRF-E from Renesas Electronics is a silicon epitaxial planar Zener diode optimized for hard-knee, low-noise voltage reference applications. It delivers a nominal Zener voltage of 7.5 V (min 7.0 V, max 7.9 V) at I_Z = 0.5 mA, with dynamic impedance Z_ZT = 380 Ω (typ), temperature coefficient γ_Z = −2.0 mV/°C, and ultra-low noise voltage - approximately 1/3 to 1/10 that of the standard HZU series. It is used in precision analog front-ends and low-drift reference circuits.

For engineers reviewing the HZU7C1LTRF-E datasheet, HZU7C1LTRF-E pinout, HZU7C1LTRF-E application, or HZU7C1LTRF-E equivalent, this page provides verified electrical characteristics, package mapping to URP (SC-76A), thermal derating behavior, low-noise design implications, and direct alternatives for voltage reference stability in space-constrained analog systems.

Technical Context

The HZU7C1LTRF-E belongs to the HZU-LL Series, engineered specifically for hard-knee Zener operation with semi-logarithmic linear V_Z–I_Z characteristics across I_Z = 1 nA to 1 mA. Its low-noise performance stems from epitaxial planar construction and optimized junction geometry, reducing flicker and avalanche noise components.

It exhibits a temperature coefficient of −2.0 mV/°C (≈ −0.027%/°C), roughly half that of the legacy HZU series, enabling improved thermal stability in unregulated environments. Absolute maximum ratings include P_D = 150 mW at T_A = 25°C and T_J = 150°C, with derating per Fig.3 in the datasheet.

Key Specifications

Pinout & Package

Package: Ultra Small Resin Package (URP), JEITA code SC-76A, Renesas code PTSP0002ZA-A, mass ≈ 0.004 g. Surface-mount compatible with 0.8 mm × 1.25 mm footprint and 0.45 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5237B-7-F and BZX84-C7V5, the HZU7C1LTRF-E uniquely balances ultra-low noise, hard-knee linearity, and miniature URP packaging - making it optimal for space-constrained, high-stability analog reference designs where sub-microamp bias and thermal drift are critical.

Availability

HZU7C1LTRF-E is available at Aetrix Electronics and suitable for high-precision ADC reference, low-drift sensor biasing, and portable instrumentation power rail applications requiring stable component supply, consistent parametric binning, and long-term lifecycle support.

Supply support for HZU7C1LTRF-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 manufacturer specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.

The HZU-LL Series was designed specifically for low-noise, hard-knee Zener reference applications in space-constrained analog systems - emphasizing thermal stability, microamp-level regulation, and reproducible breakdown characteristics.

FAQ

What is the nominal Zener voltage of the HZU7C1LTRF-E?

The HZU7C1LTRF-E has a nominal Zener voltage of 7.5 V, with a guaranteed range of 7.0 V to 7.9 V measured at I_Z = 0.5 mA. This tight tolerance supports accurate voltage referencing in precision analog circuits without requiring post-manufacture trimming. The HZU7C1LTRF-E achieves this specification using epitaxial planar junction technology optimized for hard-knee behavior.

Does the HZU7C1LTRF-E support operation below 1 µA bias current?

Yes, the HZU7C1LTRF-E maintains semi-logarithmic linear V_Z–I_Z characteristics down to I_Z = 1 nA, enabling stable regulation in ultra-low-power applications such as battery-backed sensor nodes. Its hard-knee design ensures predictable turn-on behavior even at nanoamp bias levels - a key advantage over conventional Zeners. The HZU7C1LTRF-E datasheet explicitly confirms this 1 nA to 1 mA operational range.

What is the thermal derating behavior of the HZU7C1LTRF-E?

The HZU7C1LTRF-E has an absolute maximum power dissipation of 150 mW at T_A = 25°C, with linear derating above 25°C as shown in Fig.3 of the datasheet. Derating begins immediately beyond 25°C, reaching zero dissipation at T_A ≈ 125°C. This behavior requires careful PCB thermal design - especially copper area and proximity to heat sources - to maintain junction temperature ≤150°C. The HZU7C1LTRF-E's small URP package makes thermal management particularly critical.

Is the HZU7C1LTRF-E RoHS compliant and lead-free?

Yes, the HZU7C1LTRF-E is RoHS compliant and lead-free, consistent with Renesas Electronics' environmental policy and the EU RoHS Directive. The device uses lead-free solderable terminations and halogen-free molding compound. Compliance documentation, including material declarations and test reports, is available through Renesas' official product portal. The HZU7C1LTRF-E meets all applicable substance restrictions for commercial and industrial applications.

How does the noise performance of the HZU7C1LTRF-E compare to standard Zener diodes?

The HZU7C1LTRF-E delivers approximately 1/3 to 1/10 the noise voltage of the standard HZU series, due to its epitaxial planar structure and optimized junction design. This reduction directly lowers RMS noise in reference paths - critical for high-resolution ADCs and low-level signal conditioning. Unlike general-purpose Zeners, the HZU7C1LTRF-E's low-noise specification is characterized and guaranteed across its operating current range. The HZU7C1LTRF-E datasheet quantifies this advantage in both typical and worst-case conditions.