Renesas HZ7B1L-E

Overview

HZ7B1L-E from Renesas is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 6.7–7.0 V, 400 mW power dissipation, 60 Ω dynamic resistance at 3.5 mA, and ≤1 μA reverse leakage at 2.0 V. It is used in stabilized reference supplies for instrumentation amplifiers and sensor signal conditioning.

For engineers reviewing the HZ7B1L-E datasheet, HZ7B1L-E pinout, HZ7B1L-E application, or HZ7B1L-E equivalent, key selection criteria include zener voltage tolerance (±0.3 V), low noise performance versus standard HZ series, DO-35 package thermal limits, and temperature coefficient behavior near 7 V.

Technical Context

This device operates as a two-terminal shunt voltage regulator with DC-tested zener characteristics and a specified test current of 3.5 mA. Its low dynamic impedance (60 Ω) and reduced noise level-approximately 1/3 to 1/10 that of the legacy HZ series-enable stable reference generation in high-gain, low-drift analog front-ends.

The HZ7B1L-E exhibits a negative zener voltage temperature coefficient near 7 V, confirmed by Figure 2 in the datasheet, and is rated for junction temperatures up to 175°C. It is not designed for transient suppression or high-current clamping but for precision DC biasing and reference stabilization under controlled thermal conditions.

Key Specifications

Pinout & Package

Package: DO-35 (JEITA code GRZZ0002ZB-A), glass axial leaded case with orange body and navy-blue cathode band. Dimensions per Page 5: φD = 2.0 mm, L = 26.0 mm, E = 4.2 mm; mass ≈ 0.13 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4732A and BZX55C6V8, the HZ7B1L-E offers tighter zener voltage tolerance (±0.3 V), lower dynamic resistance (60 Ω), and significantly reduced noise-making it preferable for high-precision, low-drift analog reference designs where stability and spectral purity are prioritized over raw power handling.

Availability

HZ7B1L-E is available at Aetrix Electronics and suitable for precision voltage reference, sensor signal conditioning, and instrumentation amplifier biasing requiring stable component supply across industrial, test & measurement, and medical electronics programs.

Supply support for HZ7B1L-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 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 developed specifically for low-noise, precision DC voltage reference applications-targeting designers of high-fidelity analog signal chains, sensor interfaces, and metrology-grade instrumentation where conventional Zener diodes introduce unacceptable noise or drift.

FAQ

What is the zener voltage tolerance of HZ7B1L-E?

The HZ7B1L-E has a zener voltage range of 6.7 V to 7.0 V at 3.5 mA test current, corresponding to a ±0.3 V absolute tolerance or approximately ±4.3% of the nominal 6.85 V center value. This tight tolerance eliminates need for external trimming in many 7 V reference designs and is tighter than standard commercial Zeners like BZX55C6V8 (±5%). The HZ7B1L-E specification is verified per REJ03G0182-0300 Rev.3.00.

Is HZ7B1L-E suitable for transient voltage suppression?

No, the HZ7B1L-E is not designed for transient suppression. It is a precision low-noise Zener diode rated for 400 mW DC power dissipation and intended for stable DC voltage reference applications-not surge clamping or ESD protection. Its 60 Ω dynamic resistance and low-noise structure optimize it for steady-state regulation, not fast transient response. For TVS applications, dedicated transient suppressors such as P6KE series should be used instead of HZ7B1L-E.

What is the thermal derating behavior of HZ7B1L-E above 25°C?

The HZ7B1L-E follows standard DO-35 thermal derating: its 400 mW power rating linearly decreases above 25°C ambient, reaching zero at approximately 150°C based on the curve in Figure 3 of REJ03G0182-0300. Derating slope is ~3.2 mW/°C. To maintain reliability, design must ensure junction temperature stays ≤175°C using appropriate PCB copper area and airflow-especially critical in enclosed industrial enclosures where ambient may exceed 70°C.

Does HZ7B1L-E have a specified temperature coefficient?

Yes, the HZ7B1L-E exhibits a negative temperature coefficient near 7 V, as shown in Figure 2 of the datasheet. At ~7 V, the coefficient is approximately −0.05 %/°C (or −3.5 mV/°C), meaning its zener voltage decreases slightly with rising temperature. This behavior is typical for mid-voltage Zeners and must be accounted for in high-accuracy reference designs operating across wide temperature ranges. The HZ7B1L-E datasheet confirms this via published γ_Z curves, not extrapolation.

Can HZ7B1L-E replace standard HZ-series Zeners directly?

Yes, the HZ7B1L-E is a direct functional upgrade within the same DO-35 package and pinout as legacy HZ-series diodes, offering identical cathode/anode configuration and mechanical compatibility. However, its lower noise (1/3–1/10 of HZ series) and tighter voltage tolerance provide measurable improvement in precision applications-no PCB change is needed, but system-level noise and drift validation is recommended when substituting HZ7B1L-E for older HZ parts.