Renesas HZM6C-JTR

Overview

HZM6C-JTR 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 6.2 V (B-grade, min 5.86 V / max 6.53 V at 5 mA), with dynamic resistance of 50 Ω, reverse current ≤2 µA at 3.0 V, and power dissipation up to 200 mW in the MPAK package - commonly used in voltage reference, overvoltage protection, and biasing applications for op-amps and ADCs.

For engineers reviewing the HZM6C-JTR datasheet, HZM6C-JTR pinout, HZM6C-JTR application, or HZM6C-JTR equivalent, key selection criteria include its tight zener voltage tolerance (±5% typical), low dynamic impedance, temperature coefficient near zero (~0.01 %/°C at 6.2 V), and suitability for high-density SMT layouts requiring stable 6.2 V references in industrial sensors and power management ICs.

Technical Context

The HZM6C-JTR operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its breakdown threshold. Its epitaxial planar construction ensures consistent breakdown characteristics and low noise, while the MPAK (SC-59A) package supports thermal stability up to 150°C junction temperature.

It is rated for 200 mW power dissipation at 25°C ambient, derating linearly above 25°C per Fig.3 in the datasheet, and exhibits a zener voltage temperature coefficient of approximately +0.01 %/°C - indicating minimal drift across –25°C to +85°C operating range, making it suitable for precision reference designs where thermal hysteresis must be minimized.

Key Specifications

Pinout & Package

Package: MPAK (JEDEC SC-59A), surface-mount, 3-pin plastic package with exposed pad not electrically connected; dimensions 2.8 × 1.9 × 0.95 mm (L × W × H), weight 0.011 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C6V2 and MMSZ4687, the HZM6C-JTR provides the lowest dynamic resistance and tightest temperature coefficient among 6.2 V Zeners in SC-59A, making it optimal for precision analog reference and low-drift biasing where layout space permits MPAK.

Availability

HZM6C-JTR is available at Aetrix Electronics and suitable for industrial sensor reference, overvoltage clamp for MCU I/O, and op-amp bias network applications requiring stable component supply, consistent parametric performance, and long-term obsolescence mitigation.

Supply support for HZM6C-JTR 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, formed from the merger of NEC Electronics and Renesas Technology, is a global semiconductor leader delivering microcontrollers, analog, and power devices for automotive, industrial, and IoT systems.

The HZM-N Series was developed by Hitachi (now Renesas) specifically for high-stability, low-noise voltage reference and clamping in compact SMT designs - emphasizing tight V_Z tolerance, low r_d, and predictable temperature behavior.

FAQ

What is the exact zener voltage range specified for HZM6C-JTR at 5 mA test current?

The HZM6C-JTR has a guaranteed zener voltage range of 5.86 V to 6.53 V when tested at I_Z = 5 mA and T_a = 25°C, per the B-grade specification in the Hitachi HZM-N Series datasheet Rev. 3. This 6.2 V nominal device achieves ±5% tolerance, supporting precision reference use without calibration. The HZM6C-JTR's voltage stability is further enhanced by its low temperature coefficient near zero.

Does HZM6C-JTR have a pin 1 connection, and what is its function?

No - pin 1 of the HZM6C-JTR is designated NC (No Connect) and is internally unconnected. Only pins 2 (Anode) and 3 (Cathode) are electrically active. This NC pin serves mechanical alignment and package strength but must remain unconnected on the PCB. The HZM6C-JTR functions solely as a two-terminal device despite its three-pin MPAK package.

What is the maximum reverse leakage current for HZM6C-JTR at 3.0 V, and why does that matter?

The HZM6C-JTR specifies a maximum reverse leakage current (I_R) of 2 µA at V_R = 3.0 V and T_a = 25°C. This low leakage ensures minimal error in high-impedance reference nodes and prevents unintended current paths in battery-powered or low-quiescent circuits. For example, in an op-amp bias network, this keeps offset errors below 10 µV - critical for the HZM6C-JTR's role in precision analog stages.

Can HZM6C-JTR be used in place of a 6.2 V Zener in a through-hole design?

No - the HZM6C-JTR uses the surface-mount MPAK (SC-59A) package and is not mechanically or thermally compatible with through-hole sockets or leaded footprints like DO-35. Replacing a through-hole Zener requires PCB redesign to accommodate the 2.8 × 1.9 mm MPAK land pattern. The HZM6C-JTR is intended for high-density SMT assembly, not legacy through-hole systems.

How does the temperature coefficient of HZM6C-JTR compare to other 6.2 V Zeners, and what impact does it have?

The HZM6C-JTR exhibits a temperature coefficient of approximately +0.01 %/°C at 6.2 V - among the lowest in its class - whereas many competing 6.2 V Zeners (e.g., MMSZ4687) specify +0.05 %/°C. This translates to ~0.6 mV/°C drift versus ~3 mV/°C, significantly improving long-term stability in unregulated environments. That low drift is a core design advantage of the HZM6C-JTR for precision reference applications.