Renesas HZM12NB2JTR

Overview

HZM12NB2JTR from Renesas Electronics 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 12.08–12.60 V at 5 mA, with dynamic resistance of 35 Ω, power dissipation up to 200 mW, and operates within a junction temperature range of –55°C to +150°C. It is commonly used in voltage regulation for sensor signal conditioning and microcontroller reference supplies.

For engineers reviewing the HZM12NB2JTR datasheet, HZM12NB2JTR pinout, HZM12NB2JTR application, or HZM12NB2JTR equivalent, key selection criteria include its B2-grade zener voltage tolerance (±2.5% typical), MPAK surface-mount package compatibility with high-density PCB layouts, thermal stability across industrial ambient temperatures, and suitability for low-current (<5 mA) stabilization where tight voltage accuracy and low dynamic impedance are required.

Technical Context

The HZM12NB2JTR employs a silicon epitaxial planar junction structure optimized for stable reverse-breakdown behavior under DC and pulsed conditions (40 ms pulse width). Its zener voltage exhibits a positive temperature coefficient of approximately +0.035 mV/°C near 12 V, enabling predictable drift compensation in reference designs.

It functions exclusively in reverse-bias mode with no forward conduction role; terminal 1 is NC (no internal connection), while terminals 2 (anode) and 3 (cathode) define the unidirectional breakdown path. The device is rated for 2 mA maximum reverse current at VR = 9.0 V and requires no external bias circuitry beyond series current limiting.

Key Specifications

Pinout & Package

Package: MPAK (JEITA code PLSP0003ZC-A), 3-terminal surface-mount package with 1.0 mm × 1.3 mm footprint, 0.55 mm nominal height, and SC-59A-compatible land pattern.

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 MMSZ4687T1G, the HZM12NB2JTR offers tighter B2-grade voltage tolerance (±2.5%) and lower leakage in a smaller MPAK footprint, making it preferable for space-constrained, high-accuracy 12 V reference designs - though it requires stricter current limiting due to its 200 mW rating.

Availability

HZM12NB2JTR is available at Aetrix Electronics and suitable for industrial sensor reference, microcontroller ADC reference, and low-power backup regulator applications requiring stable component supply and consistent B2-grade parametric performance.

Supply support for HZM12NB2JTR 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 specializing in microcontrollers, analog, and power solutions for industrial, automotive, and infrastructure markets.

The HZM-N Series belongs to Renesas' discrete Zener diode product line, engineered specifically for high-stability voltage reference and regulation in compact, surface-mount systems where precision, thermal robustness, and board-area efficiency are critical.

FAQ

What is the exact zener voltage range for HZM12NB2JTR at 5 mA?

The HZM12NB2JTR has a guaranteed zener voltage range of 12.08 V to 12.60 V when tested at I_Z = 5 mA and T_a = 25°C. This B2-grade specification reflects a ±2.5% tolerance around the nominal 12.34 V center point, verified per Renesas preliminary datasheet R07DS0358EJ0600 Rev.6.00. The HZM12NB2JTR's tight tolerance supports reduced post-production calibration in precision analog designs.

Is pin 1 of HZM12NB2JTR electrically connected internally?

No - pin 1 of the HZM12NB2JTR is designated NC (No Connection) and has no internal electrical connection. Per the official pin arrangement diagram in the Renesas datasheet, only pins 2 (anode) and 3 (cathode) are functional. PCB layout must leave pin 1 unconnected; routing or soldering to this terminal may compromise reliability or violate JEDEC-compliant assembly guidelines for the MPAK package.

What is the maximum reverse current specification for HZM12NB2JTR at 9.0 V?

The HZM12NB2JTR specifies a maximum reverse current (I_R) of 2 μA at V_R = 9.0 V and T_a = 25°C. This low leakage value ensures minimal parasitic loading in high-impedance reference nodes and contributes to stable operation in battery-backed or energy-harvesting circuits. The HZM12NB2JTR's leakage remains well below 5 μA across its full operating temperature range.

Can HZM12NB2JTR be used in place of a 12 V Zener diode with ±5% tolerance?

The HZM12NB2JTR can replace ±5% tolerance Zeners in applications demanding tighter regulation - but only if the design accommodates its B2-grade 12.08–12.60 V window and 200 mW power limit. Unlike wider-tolerance alternatives, the HZM12NB2JTR requires precise series resistor calculation to maintain I_Z near 5 mA. Its use improves reference accuracy but does not guarantee drop-in compatibility without verifying thermal and voltage-margin margins in the target circuit.

What is the temperature coefficient of HZM12NB2JTR near its nominal zener voltage?

The HZM12NB2JTR exhibits a positive temperature coefficient (γ_Z) of approximately +0.035 mV/°C at V_Z ≈ 12.3 V, as shown in Figure 2 of the Renesas datasheet. This value enables predictable voltage drift modeling - for example, a +30°C rise from 25°C yields ~1.05 mV increase in V_Z. The HZM12NB2JTR's low and stable γ_Z supports compensated reference designs where long-term thermal drift must remain under 0.1%.