Renesas HZ7C2LTD-E

Overview

HZ7C2LTD-E from Renesas Electronics is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, with a nominal zener voltage of 7.5 V (min 7.3 V, max 7.7 V), dynamic resistance of 60 Ω at 3.5 mA, and maximum power dissipation of 400 mW in a DO-35 package. It serves as a stable reference in low-drift power supplies and sensor biasing networks.

For engineers reviewing the HZ7C2LTD-E datasheet, HZ7C2LTD-E pinout, HZ7C2LTD-E application, or HZ7C2LTD-E equivalent, key selection criteria include its 60 Ω zener impedance, ±0.2 V zener voltage tolerance, −0.06 %/°C temperature coefficient, and suitability for noise-sensitive instrumentation and industrial control feedback loops.

Technical Context

This device operates as a two-terminal voltage reference using avalanche breakdown in a silicon planar junction structure. Its low noise level-approximately 1/3 to 1/10 that of the legacy HZ series-is achieved through optimized doping and junction geometry, enabling use in high-fidelity signal conditioning paths.

The HZ7C2LTD-E exhibits a zener voltage temperature coefficient of −0.06 %/°C (≈ −4.5 mV/°C at 7.5 V), low reverse leakage (<1 μA at VR = 2.0 V), and thermal stability up to 175°C junction temperature. It is rated for standard-grade applications including test equipment and industrial automation.

Key Specifications

Pinout & Package

Package: DO-35 (JEITA code GRZZ0002ZB-A), glass axial leaded package with orange body and navy-blue cathode band. Dimensions: φD = 2.0 mm, L = 26.0 mm, mass ≈ 0.13 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4733A and BZX55-C7V5, the HZ7C2LTD-E delivers superior noise performance and tighter voltage tolerance in the same DO-35 footprint, making it preferred for metrology-grade and audio-critical designs where reference integrity directly impacts system resolution.

Availability

HZ7C2LTD-E is available at Aetrix Electronics and suitable for industrial power supplies, precision sensor interfaces, test equipment calibration circuits, and high-fidelity audio systems requiring stable component supply with consistent parametric performance across production lots.

Supply support for HZ7C2LTD-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 manufacturer specializing in microcontrollers, analog and power devices, and system-on-chip solutions for industrial, automotive, and infrastructure markets.

The HZ-L Series was designed specifically for low-noise, high-stability voltage reference applications in instrumentation and precision analog systems, addressing limitations of earlier Zener families in noise floor and thermal drift.

FAQ

What is the exact zener voltage range for HZ7C2LTD-E at 0.5 mA test current?

The HZ7C2LTD-E has a guaranteed zener voltage range of 7.3 V minimum to 7.7 V maximum when tested at I_Z = 0.5 mA, per Renesas datasheet REJ03G0182-0300 Rev.3.00. This 0.4 V span reflects tight binning for precision reference use, and the typical value is 7.5 V. The HZ7C2LTD-E must be operated within this specified range to maintain regulation integrity.

Does HZ7C2LTD-E have a documented noise specification, and how does it compare to standard Zener diodes?

Yes - the HZ7C2LTD-E datasheet states its noise level is approximately 1/3 to 1/10 that of the legacy HZ series, achieved via optimized planar junction processing. While absolute µV/√Hz values are not published, this reduction is verified in comparative spectral analysis of reference outputs. The HZ7C2LTD-E is explicitly intended for low-noise applications where conventional Zeners introduce measurable interference.

What is the maximum allowable ambient temperature for continuous operation of HZ7C2LTD-E at full 400 mW dissipation?

The HZ7C2LTD-E is rated for 400 mW power dissipation only at T_a = 25°C. Its derating curve (Fig.3, page 4) shows linear reduction to zero at ~125°C ambient. At 85°C ambient, maximum safe dissipation is approximately 240 mW. Exceeding this risks junction temperature exceeding 175°C, so thermal design must account for PCB copper area and airflow. The HZ7C2LTD-E must never operate above its absolute maximum T_j limit.

Is HZ7C2LTD-E RoHS compliant and lead-free?

Yes - the HZ7C2LTD-E conforms to EU RoHS Directive 2011/65/EU and is lead-free. Renesas confirms environmental compliance in its general product notices and material declarations. The DO-35 glass package contains no restricted substances above threshold limits, and the HZ7C2LTD-E is suitable for use in consumer and industrial products requiring RoHS certification.

Can HZ7C2LTD-E be used in place of HZ7C2L without modification?

Yes - HZ7C2LTD-E is a direct replacement for HZ7C2L, sharing identical electrical specifications, DO-35 package, pinout, and thermal ratings. The "-E" suffix denotes updated packaging and traceability per Renesas' post-merger documentation standards (Renesas Electronics Corporation, formerly NEC Electronics). No PCB or schematic changes are needed when substituting HZ7C2LTD-E for HZ7C2L.