Renesas HZM20NB2JTR

Overview

HZM20NB2JTR from Renesas Electronics is a silicon epitaxial planar Zener diode designed for voltage stabilization in low-power analog and digital supply rails, featuring a nominal zener voltage of 20.21–21.08 V at 5 mA test current, 50 Ω dynamic resistance, and 200 mW power dissipation in MPAK (SC-59A) package - used in precision reference circuits, overvoltage protection, and biasing networks for industrial sensors and power management ICs.

For engineers reviewing the HZM20NB2JTR datasheet, HZM20NB2JTR pinout, HZM20NB2JTR application, or HZM20NB2JTR equivalent, this page delivers verified electrical specifications, terminal mapping, thermal behavior, grade-specific tolerance bands, and real-world design context for stable 20 V reference implementation without extrapolation or generic claims.

Technical Context

The HZM20NB2JTR operates as a two-terminal shunt regulator with fixed breakdown voltage defined under 5 mA zener test current and pulse-tested (Pw = 40 ms) to ensure thermal stability. Its B2 grade guarantees ±2.5% zener voltage tolerance (20.21–21.08 V), and temperature coefficient is +0.07 mV/°C per Fig.2 - enabling predictable drift compensation in ambient ranges from –55°C to +150°C.

It uses silicon epitaxial planar construction for low leakage (<2 µA at VR = 15 V), low dynamic impedance (50 Ω max), and high junction temperature rating (150°C), making it suitable for space-constrained PCB layouts where thermal derating must be calculated from Fig.3's Pd vs. Ta curve - 200 mW at 25°C, linearly decreasing to ~120 mW at 70°C on standard FR-4.

Key Specifications

Pinout & Package

MPAK (SC-59A) package: 3-terminal surface-mount device with 1.0 mm × 1.3 mm body, 0.65 mm lead pitch, and 0.1–0.26 mm lead thickness. Designed for high-density placement and reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C20LT1G and MMSZ5248B-TP, the HZM20NB2JTR offers superior voltage accuracy (±2.5%) and thermal stability (γ_Z = +0.07 mV/°C) in a compact MPAK footprint - making it optimal for precision analog references where tolerance and drift directly impact system-level measurement fidelity.

Availability

HZM20NB2JTR is available at Aetrix Electronics and suitable for industrial sensor biasing, microcontroller reset supervision, CAN bus overvoltage protection, and ADC reference stabilization requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for HZM20NB2JTR 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 enterprise systems.

The HZM-N Series targets precision voltage stabilization in space-constrained applications - engineered for tight-tolerance Zener performance, high-temperature reliability, and compatibility with high-speed SMT assembly lines.

FAQ

What is the exact zener voltage range for HZM20NB2JTR at 5 mA test current?

The HZM20NB2JTR has a guaranteed zener voltage range of 20.21 V to 21.08 V when tested at I_Z = 5 mA, per its B2 grade specification in the Renesas R07DS0358EJ0600 datasheet. This ±2.5% tolerance is tighter than standard-grade Zeners and enables accurate voltage reference design without post-production trimming. The value is pulse-tested (Pw = 40 ms) to minimize self-heating effects during measurement.

Does HZM20NB2JTR have a functional pin 1 connection?

No, pin 1 of the HZM20NB2JTR is designated NC (No Connect) - it is electrically isolated with no internal bond wire or die connection. The device functions as a two-terminal Zener diode using only pins 2 (Anode) and 3 (Cathode). Leaving pin 1 unconnected is mandatory; soldering or routing to any net may compromise reliability or violate JEDEC SC-59A mechanical compliance.

How does the dynamic resistance of HZM20NB2JTR affect its performance in a voltage reference circuit?

The HZM20NB2JTR specifies a maximum dynamic resistance (r_d) of 50 Ω at I_Z = 5 mA. In voltage reference applications, this low r_d limits output voltage variation under load changes - for example, a 1 mA change in zener current causes ≤50 mV shift in V_Z. This directly improves regulation stability in feedback networks of LDOs or op-amp references, reducing the need for additional filtering or buffering stages.

Can HZM20NB2JTR operate continuously at its 200 mW power rating?

The HZM20NB2JTR's 200 mW power dissipation rating applies only at T_a = 25°C, as shown in Fig.3 of the datasheet. Continuous operation at full rating requires strict thermal management: on standard FR-4 with 1.6 mm thickness and 1 oz Cu, derating begins above 25°C - e.g., ~120 mW at 70°C ambient. For sustained 200 mW use, PCB copper pour, thermal vias, or forced airflow must be implemented to maintain junction temperature ≤150°C.

What is the temperature coefficient of HZM20NB2JTR and how is it used in design?

The HZM20NB2JTR exhibits a temperature coefficient (γ_Z) of +0.07 mV/°C, as confirmed in Fig.2 of the Renesas datasheet. This value quantifies the positive drift in zener voltage per degree Celsius rise in junction temperature. Designers use it to calculate worst-case V_Z deviation across operating range - e.g., +1.4 mV over 20°C rise - enabling accurate error budgeting in precision analog circuits without empirical characterization.