Renesas HZU12B3TRF-E

Overview

HZU12B3TRF-E from Renesas Electronics is a silicon planar Zener diode in ultra-small URP (SC-76A) surface-mount package, designed for precision voltage stabilization in low-power circuits. It delivers a nominal Zener voltage of 12.47 V to 13.49 V (Grade B3), with 9.0 Ω dynamic resistance at 5 mA test current, 200 mW power dissipation, and operates within –55°C to +150°C storage range - commonly used in voltage reference and overvoltage protection circuits for portable instrumentation and sensor signal conditioning.

For engineers reviewing the HZU12B3TRF-E datasheet, HZU12B3TRF-E pinout, HZU12B3TRF-E application, or HZU12B3TRF-E equivalent, key selection considerations include its Grade B3 Zener tolerance band, URP package footprint compatibility with high-density PCB layouts, thermal derating behavior per Fig.3, and suitability for low-current (<5 mA) stabilization where tight voltage regulation and minimal self-heating are required.

Technical Context

The HZU12B3TRF-E employs a silicon planar junction structure optimized for stable reverse-bias operation under controlled Zener breakdown. Its electrical behavior is characterized by a well-defined knee in the I_Z–V_Z curve (Fig.1), with temperature coefficient γ_Z near 0 mV/°C for the 12 V range (Fig.2), enabling low-drift references in ambient-temperature-varying environments.

Designed for surface-mount assembly, it uses an epoxy-molded URP (SC-76A) package with cathode-marked terminal layout and taping for automated pick-and-place. Absolute maximum ratings specify 200 mW power dissipation at T_a = 25°C, derating linearly above 25°C per Fig.3, and a 150°C maximum junction temperature - confirming suitability for thermally constrained consumer and industrial control applications.

Key Specifications

Pinout & Package

Ultra-small Resin Package (URP), also known as SC-76A, measures 0.8 mm × 1.5 mm with 0.8 mm height and 0.004 g typical mass. Cathode is marked on the top surface; terminals are arranged in a two-terminal side-leaded configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C12LT1G and MMSZ5242BT1G, the HZU12B3TRF-E offers superior voltage accuracy (±4.2% vs. ±5%), lower dynamic resistance (9.0 Ω vs. ≥15 Ω), and smallest footprint (URP/SC-76A), making it optimal for miniaturized, thermally sensitive, and precision-stabilization applications where board area and regulation error are critical.

Availability

HZU12B3TRF-E is available at Aetrix Electronics and suitable for portable instrumentation, microcontroller reset circuits, LED driver references, and USB-C PD overvoltage protection requiring stable component supply and consistent Grade-B3 Zener performance.

Supply support for HZU12B3TRF-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' discrete Zener diode product line, engineered specifically for high-accuracy, low-power voltage stabilization in space-constrained surface-mount applications - emphasizing tight tolerance grading, low dynamic resistance, and thermal stability.

FAQ

What is the Zener voltage range for HZU12B3TRF-E?

The HZU12B3TRF-E has a guaranteed Zener voltage range of 12.47 V to 13.49 V at 5 mA test current, corresponding to its Grade B3 specification. This 4.2% tolerance band is tighter than standard Grade B (±5%) and reflects Renesas' binning for improved system-level voltage margin control in precision stabilization circuits.

Does HZU12B3TRF-E support reflow soldering?

Yes, the HZU12B3TRF-E is qualified for lead-free reflow soldering per J-STD-020. Its URP (SC-76A) package uses epoxy molding compound rated for peak reflow temperatures up to 260°C, and its taping format (TRF, 3,000 pcs/reel) is compatible with standard SMT pick-and-place equipment.

What is the maximum reverse leakage current for HZU12B3TRF-E?

The maximum reverse leakage current (I_R) for HZU12B3TRF-E is 2 μA at V_R = 9.0 V, measured at T_a = 25°C. This low leakage ensures minimal parasitic loading in high-impedance reference or bias networks, preserving accuracy in battery-powered and low-quiescent-current designs.

How does the dynamic resistance of HZU12B3TRF-E affect voltage regulation?

The HZU12B3TRF-E exhibits 9.0 Ω dynamic resistance at 5 mA, meaning a 1 mA change in Zener current causes approximately 9 mV output voltage shift. This low r_d value directly improves load regulation performance - critical when driving variable loads or sharing current with parallel components in precision reference paths.

Is HZU12B3TRF-E RoHS compliant?

Yes, HZU12B3TRF-E complies with EU RoHS Directive 2011/65/EU and is lead-free. Renesas confirms halogen-free and green material content per their environmental compliance documentation, and the device carries appropriate marking per JEDEC standards for RoHS-conforming surface-mount packages.