Renesas HZ4.7CP-E

Overview

HZ4.7CP-E from Renesas is a silicon epitaxial planar Zener diode designed for voltage regulation and overvoltage limiting in DC power rails and reference circuits. It delivers a nominal zener voltage of 4.7 V (min 4.4 V, max 5.2 V) at 40 µA reverse current, with 1.0 Ω dynamic resistance at 10 mA test current and 1.0 W power dissipation in DO-41 glass package.

For engineers reviewing the HZ4.7CP-E datasheet, HZ4.7CP-E pinout, HZ4.7CP-E application, or HZ4.7CP-E equivalent, key selection criteria include its tight 4.7 V ±5% tolerance (Grade CP), low 1.0 Ω dynamic impedance, DO-41 mechanical reliability, and suitability for precision voltage clamping in industrial power supplies and analog sensor interfaces.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage under varying load or input conditions. Its DO-41 glass package provides hermetic sealing and thermal stability up to 175°C junction temperature, supporting operation in ambient temperatures from −55°C to +175°C.

The device exhibits a negative temperature coefficient near 4.7 V (≈−0.04 %/°C per Fig.2), enabling predictable drift behavior in temperature-sensitive references. It sustains nonrepetitive surge reverse power up to 1.0 W for short durations, as validated by transient thermal impedance curves for 10 mm lead length.

Key Specifications

Pinout & Package

DO-41 glass axial-leaded package with cathode band marking; leads are tinned copper-clad steel, 0.38 g mass, 26.0 mm minimum body length, 3.0 mm maximum diameter.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage regulation applications.

Compared with 1N4732A and BZX55-C4V7, HZ4.7CP-E offers tenfold lower dynamic resistance and double the power rating of BZX55-C4V7, making it uniquely suited for high-accuracy, high-energy clamping in industrial control and automotive subsystems where thermal margin and regulation tightness are critical.

Availability

HZ4.7CP-E is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, and medical analog front-ends requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.

Supply support for HZ4.7CP-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 Technology Corp. (now part of Renesas Electronics Corporation) is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

The HZ-P Series was engineered specifically for high-reliability voltage reference and overvoltage limiting in harsh-environment applications, emphasizing DO-41 mechanical robustness, wide temperature operation, and tight zener voltage tolerances across 1.88–40 V range.

FAQ

What is the zener voltage tolerance of HZ4.7CP-E?

HZ4.7CP-E has a zener voltage tolerance of ±5% around its nominal 4.7 V rating, meaning the actual measured V_Z falls between 4.4 V and 5.2 V when tested at 40 µA reverse current. This Grade CP specification ensures consistent clamping performance across production lots without requiring binning or calibration. The HZ4.7CP-E achieves this tight tolerance via epitaxial planar process control and post-trim screening, making it suitable for applications where reference stability is critical.

Can HZ4.7CP-E be used in surface-mount designs?

No, HZ4.7CP-E is exclusively available in the through-hole DO-41 axial-leaded glass package and is not offered in any surface-mount variant. Its mechanical construction-26.0 mm minimum body length, 3.0 mm diameter, and tinned copper-clad steel leads-is optimized for manual or wave soldering in industrial PCB assemblies. For SMT alternatives, designers must select functionally similar but package-different parts such as MMBZ4700 or BZX84-C4V7, which differ in power rating, dynamic resistance, and thermal performance from HZ4.7CP-E.

What is the maximum surge power HZ4.7CP-E can withstand?

HZ4.7CP-E supports nonrepetitive surge reverse power (P_RSM) up to 1.0 W for pulse durations defined by its transient thermal impedance curve, with capability diminishing as pulse width increases beyond 10 ms. At 100 µs, it handles ~100 W peak; at 10 ms, ~10 W; and at 100 ms, ~1.0 W. This surge rating is validated per Figure 4 in the original Renesas datasheet (REJ03G0236-0600Z). Continuous operation must remain within the 1.0 W DC limit to avoid junction overheating.

How does the temperature coefficient of HZ4.7CP-E affect circuit performance?

HZ4.7CP-E exhibits a negative temperature coefficient of approximately −0.04 %/°C (or −1.9 mV/°C) near 4.7 V, as shown in Figure 2 of the datasheet. This means its zener voltage decreases by ~0.04% per degree Celsius rise in junction temperature. In precision reference applications, this drift must be compensated via circuit design (e.g., combining with positive-TC components) or operating within a controlled thermal envelope. The HZ4.7CP-E's predictable TC enables stable long-term behavior in thermally managed systems like industrial controllers.

Is HZ4.7CP-E RoHS compliant?

HZ4.7CP-E was released in April 2004 under Rev.6.00 of the REJ03G0236-0600Z datasheet, predating mandatory RoHS enforcement (July 2006). While Renesas later confirmed legacy DO-41 Zener diodes-including the HZ-P Series-were transitioned to lead-free terminations in subsequent manufacturing lots, the original HZ4.7CP-E as documented in this revision is not explicitly certified RoHS-compliant. For new designs requiring compliance, verify current lot status with Renesas or consult Aetrix Electronics for RoHS-qualified equivalents bearing updated part suffixes or packaging markings.