Renesas HZU11B2LTRF-E

Overview

HZU11B2LTRF-E from Renesas Electronics is a silicon planar Zener diode designed for precision voltage stabilization in low-power analog and reference circuits, featuring a nominal Zener voltage of 11.10–11.56 V at 5 mA, 8.0 Ω dynamic resistance, and 200 mW power dissipation in an ultra-small URP (SC-76A) surface-mount package.

For engineers reviewing the HZU11B2LTRF-E datasheet, HZU11B2LTRF-E pinout, HZU11B2LTRF-E application, or HZU11B2LTRF-E equivalent, this device serves as a compact, tape-and-reel delivered voltage reference for power supply feedback loops, sensor biasing, and overvoltage protection in space-constrained industrial and consumer electronics.

Technical Context

The HZU11B2LTRF-E operates as a two-terminal shunt regulator with cathode-anode polarity, optimized for stable reverse-biased conduction at its specified Zener test current (IZ = 5 mA). Its junction temperature rating of 150°C supports operation in thermally demanding environments without derating below ambient.

It exhibits a negative Zener voltage temperature coefficient near –0.04 %/°C (≈ –4.4 mV/°C), enabling predictable drift behavior in temperature-compensated references. The URP package's 0.8 mm × 1.5 mm footprint and 0.45 mm max height ensure compatibility with fine-pitch automated assembly and high-density PCB layouts.

Key Specifications

Pinout & Package

Ultra-small Resin Package (URP, JEITA code SC-76A), 2-pin surface-mount device with cathode marked by dot on top surface. Dimensions: 0.8 mm (W) × 1.5 mm (L) × 0.45 mm (H) max.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C11LT1G and MMSZ5240BT1G, the HZU11B2LTRF-E offers superior size efficiency (0.8 × 1.5 mm vs. ≥1.3 × 2.9 mm), tighter V_Z grading (±2.1% vs. ±5%), and optimized low-current stability at 5 mA-making it ideal for miniaturized, precision-biased systems where board area and regulation accuracy are prioritized over raw power handling.

Availability

HZU11B2LTRF-E is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical monitors, and automotive body control modules requiring stable component supply, consistent Zener voltage grading, and ultra-compact surface-mount packaging.

Supply support for HZU11B2LTRF-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 leader delivering microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.

The HZU Series belongs to Renesas' discrete Zener diode product line, engineered specifically for high-precision, low-power voltage stabilization in space-constrained surface-mount applications.

FAQ

What is the Zener voltage tolerance of HZU11B2LTRF-E?

The HZU11B2LTRF-E has a guaranteed Zener voltage range of 11.10 V to 11.56 V at 5 mA test current, corresponding to ±2.1% tolerance around the nominal 11.33 V center point. This B2 grade specification ensures consistent regulation performance across production batches without post-manufacturing sorting or calibration. The HZU11B2LTRF-E maintains this tolerance under standard operating conditions (Ta = 25°C) and is validated per Renesas R07DS0423EJ1000 Rev.10.00.

Does HZU11B2LTRF-E require a series current-limiting resistor?

Yes, the HZU11B2LTRF-E must be used with an external series current-limiting resistor to establish the required Zener test current (5 mA) and prevent thermal runaway. For example, with a 12 V supply and target 5 mA current, a 180 Ω resistor provides ~11.1 V drop across the HZU11B2LTRF-E while dissipating ~60 mW. The resistor value must be selected based on worst-case supply voltage, load current, and desired regulation margin. This requirement applies to all shunt Zener configurations, including the HZU11B2LTRF-E.

What is the thermal derating behavior of HZU11B2LTRF-E above 25°C ambient?

The HZU11B2LTRF-E follows linear thermal derating: its 200 mW power dissipation rating decreases by 1.6 mW/°C above 25°C ambient, reaching zero at 150°C junction temperature. At 75°C ambient, maximum allowable power drops to 120 mW. This derating curve is defined in Figure 3 of the Renesas datasheet R07DS0423EJ1000 and directly impacts design margin for the HZU11B2LTRF-E in enclosed or high-temperature environments.

Is HZU11B2LTRF-E RoHS compliant and lead-free?

Yes, the HZU11B2LTRF-E is RoHS compliant and lead-free, conforming to EU Directive 2011/65/EU and Renesas' environmental policy. The device uses matte tin plating on terminals and halogen-free molding compound, verified per JESD22-A112 and JEDEC J-STD-020 standards. This compliance applies to the full production lot of HZU11B2LTRF-E and is documented in Renesas' material declarations and certificate of compliance.

How does the temperature coefficient of HZU11B2LTRF-E affect long-term voltage stability?

The HZU11B2LTRF-E exhibits a typical Zener voltage temperature coefficient of –0.04 %/°C (≈ –4.4 mV/°C), meaning its regulated voltage decreases by ~0.44 V over a 100°C ambient rise. This predictable negative drift allows compensation in multi-stage references and makes the HZU11B2LTRF-E suitable for applications where monotonic, known drift is preferable to zero-TC alternatives. Designers should account for this coefficient when specifying operating temperature ranges for the HZU11B2LTRF-E.