Renesas HZM4.3NB3TL-E

Overview

HZM4.3NB3TL-E from Renesas Electronics is a silicon epitaxial planar Zener diode designed for precision voltage stabilization in low-power analog and power-supply feedback circuits, with a nominal zener voltage of 4.3 V (min 4.28 V, max 4.48 V at 5 mA), dynamic resistance of 130 Ω, and maximum power dissipation of 200 mW in the MPAK package.

For engineers reviewing the HZM4.3NB3TL-E datasheet, HZM4.3NB3TL-E pinout, HZM4.3NB3TL-E application, or HZM4.3NB3TL-E equivalent, this device serves as a compact, surface-mount voltage reference for regulator error amplifiers, overvoltage protection clamps, and biasing networks where tight tolerance (±0.1 V), low temperature coefficient (≈+0.02 mV/°C), and high-density PCB layout are critical.

Technical Context

The HZM4.3NB3TL-E operates as a two-terminal shunt regulator, conducting reverse current above its specified breakdown threshold to maintain stable output voltage across varying load conditions. Its epitaxial planar construction ensures consistent avalanche characteristics and low leakage (<10 µA at 1.0 V).

Designed for DC stabilization-not transient suppression-it exhibits a typical temperature coefficient of +0.02 mV/°C near 4.3 V, placing it in the positive-coefficient region per Figure 2 of the datasheet, and is rated for junction temperatures up to 150°C with storage range from –55°C to +150°C.

Key Specifications

Pinout & Package

MPAK package: 3-terminal surface-mount plastic package with exposed cathode pad for thermal enhancement; dimensions per JEITA code PLSP0003ZC-A (D = 2.7–3.1 mm, E = 1.35–1.65 mm, thickness ≈ 0.95 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C4V3 and MMSZ4V3ET1G, the HZM4.3NB3TL-E offers the narrowest V_Z tolerance (±0.1 V) and explicit NC terminal for noise isolation-making it optimal for high-accuracy feedback paths where board-level coupling must be minimized.

Availability

HZM4.3NB3TL-E is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery feedback, and programmable logic controller I/O modules requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle continuity.

Supply support for HZM4.3NB3TL-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 power devices, and timing solutions for industrial, automotive, and infrastructure markets.

The HZM-N Series belongs to Renesas' discrete voltage reference product line, engineered specifically for high-stability, low-drift shunt regulation in space-constrained, high-reliability power management subsystems.

FAQ

What is the exact zener voltage range for HZM4.3NB3TL-E at 5 mA test current?

The HZM4.3NB3TL-E has a guaranteed zener voltage range of 4.28 V to 4.48 V when tested at I_Z = 5 mA, corresponding to Grade B3 specification per Renesas datasheet R07DS0358EJ0600. This ±0.1 V tolerance supports precision feedback applications where tighter regulation than standard ±5% Zeners is required. The HZM4.3NB3TL-E achieves this via epitaxial planar process control and grade-binning during final test.

Does HZM4.3NB3TL-E require external current limiting in circuit design?

Yes, the HZM4.3NB3TL-E must be used with a series current-limiting resistor to ensure operating current stays within its 200 mW power limit and avoids thermal runaway. For example, at 12 V input and 4.3 V regulation, a minimum 390 Ω resistor limits worst-case current to ~20 mA (240 mW), exceeding rating-so ≥470 Ω is recommended. The HZM4.3NB3TL-E does not integrate current limiting; proper resistor selection is essential for reliability.

Can Pin 1 (NC) of HZM4.3NB3TL-E be left floating or must it be grounded?

Pin 1 of the HZM4.3NB3TL-E is a true No Connect-electrically isolated with no internal bond wire or die connection. It may be left floating, soldered to copper pour for mechanical stability, or tied to ground for EMI shielding; none affects electrical performance. Renesas explicitly states "NC" in the pin arrangement diagram and confirms no internal linkage. Leaving Pin 1 unconnected poses no risk to HZM4.3NB3TL-E functionality.

How does the temperature coefficient of HZM4.3NB3TL-E impact long-term voltage stability?

The HZM4.3NB3TL-E exhibits a positive temperature coefficient of approximately +0.02 mV/°C near 4.3 V, meaning its zener voltage increases by ~0.2 mV per 10°C rise. Over a –25°C to +85°C range, this results in <2.2 mV total drift (±0.05%), supporting stable reference performance in non-thermally compensated circuits. This behavior is confirmed in Figure 2 of the HZM-N Series datasheet and is intrinsic to the 4.3 V avalanche mechanism in the HZM4.3NB3TL-E's epitaxial structure.

Is HZM4.3NB3TL-E compatible with lead-free reflow profiles?

Yes, the HZM4.3NB3TL-E's MPAK package is qualified for lead-free reflow soldering per J-STD-020, with peak temperature tolerance up to 260°C for 30 seconds. Its plastic body and internal metallization meet RoHS requirements, and the device is shipped tape-and-reel (TL format, 3,000 pcs/reel) with moisture sensitivity level (MSL) 1-no floor life limitation. Aetrix Electronics guarantees full compliance with IPC-J-STD-020 for HZM4.3NB3TL-E assembly.