Renesas HZ5BLLTD-E

Overview

HZ5BLLTD-E from Renesas Electronics is a silicon planar Zener diode optimized for hard-knee, low-noise voltage reference applications at low currents (IZ = 0.5 mA), with a nominal Zener voltage of 4.8 V (min 4.6 V, max 5.0 V), dynamic impedance of 380 Ω at IZT = 3.0 mA, and temperature coefficient of –0.02 mV/°C. It is used in precision analog front-ends and sensor biasing circuits requiring stable low-current regulation.

For engineers reviewing the HZ5BLLTD-E datasheet, HZ5BLLTD-E pinout, HZ5BLLTD-E application, or HZ5BLLTD-E equivalent, key selection criteria include its sharp breakdown knee below 1 mA, ultra-low noise performance (~1/10 that of standard Zeners), DO-35 package compatibility, and suitability for low-power reference design where thermal drift and dynamic impedance directly impact ADC reference stability and op-amp offset calibration.

Technical Context

The HZ5BLLTD-E employs a planar diffusion structure to achieve semi-logarithmic VZ–IZ linearity from 1 nA to 1 mA, enabling precise low-current regulation without external current boosting. Its hard-knee characteristic minimizes voltage hysteresis during turn-on transitions, critical for start-up sequencing in battery-powered instrumentation.

Designed for operation at IZK = 0.5 µA (knee current), it delivers ∆VZ1 = 0.5 V and ∆VZ2 = 0.6 V across defined current steps-quantifying knee sharpness-and maintains ZZK ≤ 50 Ω at IZK, ensuring minimal deviation under microampere-level load variations.

Key Specifications

Pinout & Package

Package: DO-35 (JEITA code GRZZ0002ZB-A), glass axial leaded case with navy blue cathode band; body color Verdure; mass 0.13 g; dimensions φD = 2.0 mm, L = 26.0 mm, E = 4.2 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5229B and BZX55-C4V7, the HZ5BLLTD-E provides superior low-current regulation fidelity, lower noise, and tighter thermal stability-making it the only option among the three qualified for sub-100 µA, high-accuracy reference designs.

Availability

HZ5BLLTD-E is available at Aetrix Electronics and suitable for portable sensor signal conditioning, low-power data acquisition reference, and medical wearable front-end biasing requiring stable component supply with guaranteed long-term continuity.

Supply support for HZ5BLLTD-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 leader specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and consumer systems.

The HZ-LL Series was designed specifically for precision low-current voltage reference applications demanding hard-knee breakdown, ultra-low noise, and minimal temperature drift-targeting high-fidelity analog signal chains in resource-constrained devices.

FAQ

What is the Zener voltage tolerance of HZ5BLLTD-E at 0.5 mA test current?

The HZ5BLLTD-E has a guaranteed Zener voltage range of 4.6 V minimum to 5.0 V maximum when tested at IZ = 0.5 mA, yielding a nominal 4.8 V reference with ±0.2 V absolute tolerance. This tight spread supports high-accuracy biasing without post-production trimming. The HZ5BLLTD-E achieves this via controlled planar diffusion process and on-wafer screening, making it suitable for applications where reference stability directly impacts measurement resolution.

Does HZ5BLLTD-E support operation below 1 µA, and what is its knee current specification?

Yes, the HZ5BLLTD-E is characterized down to 1 nA and specifies IZK = 0.5 µA as its defined knee current-the point where dynamic impedance ZZK is measured at ≤50 Ω. This enables stable regulation in ultra-low-power modes, such as sleep-state sensor biasing. The HZ5BLLTD-E's semi-logarithmic VZ–IZ behavior ensures predictable voltage output even at nanoampere currents, unlike conventional Zeners that become highly nonlinear below 10 µA.

How does the temperature coefficient of HZ5BLLTD-E compare to standard Zener diodes?

The HZ5BLLTD-E exhibits a temperature coefficient of –0.02 mV/°C, which is approximately 100× lower than typical 4.7 V Zeners (e.g., BZX55-C4V7 at –2.5 mV/°C). This translates to <±0.5 mV drift over 0–70°C, versus >175 mV for standard parts. The HZ5BLLTD-E achieves this via optimized doping profile and planar junction geometry, making it uniquely suited for applications where ambient temperature variation would otherwise dominate reference error.

Is HZ5BLLTD-E compatible with automated PCB assembly processes?

Yes, the HZ5BLLTD-E uses the industry-standard DO-35 package (JEITA GRZZ0002ZB-A) with axial leads and defined pitch (E = 4.2 mm), fully compatible with wave soldering, reflow-compatible lead tinning, and pick-and-place handling. Its glass body and navy blue cathode band support optical orientation detection. The HZ5BLLTD-E's 0.13 g mass and mechanical robustness meet IPC-J-STD-020 moisture sensitivity level 1 requirements for unlimited floor life.

Can HZ5BLLTD-E replace standard Zeners like 1N4732A in existing designs without layout changes?

No-while both are DO-35 packaged, the HZ5BLLTD-E is optimized for low-current operation (0.5 mA IZ) versus 1N4732A's 49 mA test current, resulting in different thermal and dynamic impedance behavior. Substituting HZ5BLLTD-E into a 1N4732A-based circuit risks insufficient bias current and unstable regulation. The HZ5BLLTD-E must be used with appropriate series resistance and load conditions matching its 0.5–3.0 mA operating range; direct drop-in replacement is not supported.