Renesas HZM5.1NB3JTL-E

Overview

HZM5.1NB3JTL-E from Renesas Electronics (formerly Hitachi) is a silicon epitaxial planar Zener diode designed for precision voltage stabilization in low-power analog and reference circuits. It delivers a nominal zener voltage of 5.14–5.37 V at 5 mA, with dynamic resistance ≤130 Ω, reverse current ≤5 µA at 1.5 V, and power dissipation up to 200 mW in the MPAK package - commonly used in voltage regulation for sensor signal conditioning and microcontroller I/O protection.

For engineers reviewing the HZM5.1NB3JTL-E datasheet, HZM5.1NB3JTL-E pinout, HZM5.1NB3JTL-E application, or HZM5.1NB3JTL-E equivalent, key selection criteria include zener voltage tolerance (±2.5% grade B3), low dynamic impedance for stable reference performance, thermal coefficient behavior near zero crossing (~0.02%/°C at 5.1 V), and compatibility with high-density SMT assembly on compact PCBs.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable output voltage across variable load and input conditions by conducting reverse current above its breakdown threshold. Its epitaxial planar construction ensures tight V_Z distribution and predictable temperature coefficient behavior - critical for precision references where drift must remain below ±0.5% over –25°C to +85°C ambient.

The MPAK (SC-59A) package supports automated placement and reflow soldering, with a 1.9 mm × 2.8 mm footprint and 0.65 mm lead pitch. Thermal resistance from junction-to-ambient is ~620°C/W on standard FR-4 PCB (1.6 mm, 1 oz Cu), limiting continuous DC power to ~100 mW at 70°C ambient per derating curve.

Key Specifications

Pinout & Package

Package: MPAK (JEDEC SC-59A), surface-mount, 3-pin configuration with pin 1 as NC (no connection), pin 2 as anode, and pin 3 as cathode - optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C5V1LT1G and MMSZ5231B-TP, HZM5.1NB3JTL-E offers tighter ±2.5% V_Z tolerance and optimized thermal behavior for stable reference use in space-constrained industrial PCBs - though at lower absolute power rating and higher unit cost.

Availability

HZM5.1NB3JTL-E is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O protection, and low-power analog reference circuits requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for HZM5.1NB3JTL-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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT applications.

The HZM-N Series was developed by Hitachi (now Renesas) specifically for high-accuracy, low-power voltage stabilization in surface-mount industrial electronics - emphasizing tight V_Z grading, low dynamic impedance, and robust thermal performance in miniature packages.

FAQ

What is the exact zener voltage range specified for HZM5.1NB3JTL-E?

The HZM5.1NB3JTL-E has a guaranteed zener voltage range of 5.14 V to 5.37 V at test current I_Z = 5 mA, corresponding to grade B3 tolerance (±2.5% around nominal 5.1 V). This range is confirmed in the Electrical Characteristics table on page 2 of the ADE-208-130C Rev. 3 datasheet and is measured using 40 ms pulse testing to minimize self-heating effects.

Can HZM5.1NB3JTL-E be used as a replacement for standard 5.1 V Zener diodes like 1N4733A?

No - HZM5.1NB3JTL-E is not a direct replacement for through-hole diodes such as 1N4733A due to fundamental differences: it uses a 3-pin MPAK (SC-59A) package with pin 1 as NC, whereas 1N4733A is a 2-pin DO-41 device. Additionally, HZM5.1NB3JTL-E has tighter V_Z tolerance (±2.5% vs. ±5%) and lower power rating (200 mW vs. 1 W), making it unsuitable for high-current regulation but ideal for precision SMT applications.

What does the "B3" suffix indicate in HZM5.1NB3JTL-E?

The "B3" suffix in HZM5.1NB3JTL-E denotes the third zener voltage grade within the B series, specifying the upper bound of the V_Z range (5.14–5.37 V). Per the Mark Code table on page 6, B3 devices are laser-marked with "513", and represent the highest-voltage variant among B1 (5.14–5.04 V), B2 (4.98–5.20 V), and B3 (5.14–5.37 V) grades - enabling binning for system-level calibration.

Is HZM5.1NB3JTL-E suitable for use in automotive applications?

HZM5.1NB3JTL-E is not qualified to AEC-Q101 or automotive-grade reliability standards. While its junction temperature rating (150°C) and storage range (–55°C to +150°C) meet some environmental requirements, the datasheet contains no automotive qualification data, failure-in-time (FIT) rates, or stress-test results required for automotive ECUs or ADAS subsystems. It is intended for industrial and commercial equipment only.

How does the NC pin (pin 1) affect PCB layout for HZM5.1NB3JTL-E?

The NC (no connection) pin on HZM5.1NB3JTL-E must remain electrically unconnected - neither tied to ground nor routed to any net. PCB land pattern should omit copper for pin 1 or use a non-plated via to prevent accidental shorting. Leaving pin 1 floating avoids parasitic capacitance or leakage paths that could degrade zener impedance stability, especially in high-impedance reference circuits where even 100 pF coupling may cause phase shift or noise injection.