Renesas HZU9.1B3TRF-E

Overview

HZU9.1B3TRF-E from Renesas Electronics is a silicon planar Zener diode designed for precision voltage stabilization in low-power analog and power-supply feedback circuits, with a nominal Zener voltage of 9.15 V to 9.55 V at 5 mA test current, 6.0 Ω dynamic resistance, and 200 mW power dissipation in an ultra-small URP surface-mount package.

For engineers reviewing the HZU9.1B3TRF-E datasheet, HZU9.1B3TRF-E pinout, HZU9.1B3TRF-E application, or HZU9.1B3TRF-E equivalent, key selection criteria include Zener voltage tolerance (±2.2% typical), low dynamic impedance for stable regulation under load transients, thermal derating behavior up to 150°C junction temperature, and compatibility with automated SMT assembly due to its taping format (3,000 pcs/reel) and SC-76A footprint.

Technical Context

The HZU9.1B3TRF-E operates as a two-terminal shunt regulator, maintaining a stable reference voltage across its cathode-anode terminals when reverse-biased above its breakdown threshold. Its silicon planar construction ensures repeatable Zener characteristics and low leakage (<2 µA at VR = 7.0 V).

It exhibits a positive Zener voltage temperature coefficient near +0.04 %/°C (≈ +3.6 mV/°C) per Figure 2 of the datasheet, enabling predictable drift compensation in temperature-sensitive references. The device is rated for continuous operation at Ta ≤ 80°C before thermal derating begins, per Fig. 3's Pd vs. Ta curve.

Key Specifications

Pinout & Package

Ultra-small Resin Package (URP), also known as SC-76A or JEITA code PTSP0002ZA-A, measures 0.8 mm × 0.8 mm × 0.45 mm with gull-wing leads and a cathode-marked top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584-C9V1 and MMSZ5240B, the HZU9.1B3TRF-E delivers tighter voltage tolerance (±2.2%), lower dynamic impedance (6.0 Ω), and the smallest available footprint (0.8 × 0.8 mm), making it optimal for miniaturized, high-accuracy reference designs where thermal and spatial constraints dominate.

Availability

HZU9.1B3TRF-E is available at Aetrix Electronics and suitable for power supply feedback references, overvoltage clamping circuits, temperature-compensated references, and low-power sensor biasing requiring stable component supply and full traceability.

Supply support for HZU9.1B3TRF-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 manufacturer headquartered in Japan, specializing in microcontrollers, analog and power devices, and system-on-chip solutions for industrial, automotive, and consumer markets.

The HZU Series belongs to Renesas' precision discrete portfolio, engineered specifically for compact, high-stability voltage reference and protection functions in space-constrained, low-power electronic systems.

FAQ

What is the Zener voltage tolerance of HZU9.1B3TRF-E?

The HZU9.1B3TRF-E has a Zener voltage range of 9.15 V to 9.55 V at I_Z = 5 mA, corresponding to a ±2.2% tolerance about the nominal 9.1 V rating. This B3-grade specification is tighter than B1/B2 variants in the same HZU9.1 family and is confirmed in Table on page 3 of R07DS0423EJ1000 Rev.10.00. The HZU9.1B3TRF-E achieves this consistency through binning during final test.

Does HZU9.1B3TRF-E require a series current-limiting resistor?

Yes, the HZU9.1B3TRF-E must be used with an external series resistor to limit reverse current to within its 200 mW power rating and avoid thermal runaway. For example, at 12 V supply and 5 mA operating current, a 580 Ω resistor sets safe bias. The HZU9.1B3TRF-E does not contain internal current regulation and relies entirely on external impedance for stable operation.

Is HZU9.1B3TRF-E RoHS compliant and lead-free?

Yes, the HZU9.1B3TRF-E meets RoHS Directive 2011/65/EU requirements and is manufactured with lead-free terminations and halogen-free molding compound, as confirmed by Renesas' environmental compliance documentation referenced on page 6 of R07DS0423EJ1000 Rev.10.00. The HZU9.1B3TRF-E is suitable for use in consumer and industrial products requiring full EU regulatory conformance.

What is the thermal resistance junction-to-ambient (θ_JA) for HZU9.1B3TRF-E?

The datasheet does not specify θ_JA as a discrete value, but Figure 3 (Page 5) provides the derating curve: power dissipation linearly decreases from 200 mW at 25°C ambient to 0 mW at 150°C. From this, θ_JA is calculated as approximately 625 °C/W. This value applies to the standard JEDEC 2-layer board test condition and must be re-evaluated for actual PCB layout when using the HZU9.1B3TRF-E in thermally demanding applications.

Can HZU9.1B3TRF-E be used in place of HZU9.1B2TRF-E?

No - the HZU9.1B3TRF-E and HZU9.1B2TRF-E are distinct grade variants with different Zener voltage ranges: B3 is 9.15–9.55 V, while B2 is 9.77–10.21 V. Substituting one for the other will shift regulation voltage by ~6%, potentially violating system specifications. The HZU9.1B3TRF-E is not a drop-in replacement for HZU9.1B2TRF-E; design validation is required if changing grades.