Renesas HZ7B1RE-E

Overview

HZ7B1RE-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 noise level approximately 1/3–1/10 that of the standard HZ series. It is used in stabilized power supplies and low-noise reference circuits where thermal stability and low ripple are critical.

For engineers reviewing the HZ7B1RE-E datasheet, HZ7B1RE-E pinout, HZ7B1RE-E application, or HZ7B1RE-E equivalent, key selection criteria include zener voltage tolerance (±0.3 V), low temperature coefficient (−0.02 %/°C near 7 V), DO-35 package compatibility, and verified low-noise performance in DC-biased reference designs.

Technical Context

The HZ7B1RE-E operates as a two-terminal voltage reference device with a controlled reverse-breakdown characteristic. Its zener voltage is specified at 3.5 mA test current, with dynamic resistance measured under DC conditions and junction temperature rated up to 175°C.

It belongs to the HZ-L Series, distinguished by reduced diode noise, low leakage current (≤1 μA at VR = 2.0 V), and tight zener voltage distribution across variants (e.g., HZ7B1L/HZ7B2L/HZ7B3L). The device exhibits a negative temperature coefficient near 7 V, minimizing drift in ambient-temperature-varying applications.

Key Specifications

Pinout & Package

Package: DO-35 (JEITA code GRZZ0002ZB-A), glass axial leaded, orange body with navy blue cathode band. Mass: 0.13 g. Dimensions: φD = 2.0 mm, L = 26.0 mm, E = 4.2 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4732A and BZX55C6V8, the HZ7B1RE-E delivers tighter voltage control (±0.15 V), documented ultra-low noise, and guaranteed low dynamic resistance-making it uniquely suited for metrology-grade references where SNR and thermal drift dominate design constraints.

Availability

HZ7B1RE-E is available at Aetrix Electronics and suitable for stabilized power supplies, precision analog references, and low-noise sensor interfaces requiring stable component supply with traceable sourcing and long-term lifecycle support.

Supply support for HZ7B1RE-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, with leadership in automotive, industrial, and infrastructure markets.

The HZ-L Series was designed specifically for low-noise, high-stability voltage reference applications in precision instrumentation and signal chain subsystems-addressing limitations of legacy Zener families in SNR-critical designs.

FAQ

What is the zener voltage tolerance of HZ7B1RE-E?

The HZ7B1RE-E has a zener voltage range of 6.7 V to 7.0 V at 3.5 mA test current, corresponding to a ±0.15 V absolute tolerance. This tight specification enables direct use in applications requiring minimal post-calibration, such as factory-trimmed sensor signal conditioners and portable test equipment where board space prohibits external trimming components. The HZ7B1RE-E achieves this via process-controlled doping and wafer-level screening.

Does HZ7B1RE-E support DC-only operation or can it handle AC signals?

The HZ7B1RE-E is characterized and tested exclusively under DC conditions per its datasheet (REJ03G0182-0300 Rev.3.00), with all electrical parameters-including V_Z, r_d, and I_R-specified at steady-state DC bias. While it may function in low-frequency AC-clamping roles, its low-noise advantage and dynamic resistance spec apply only to DC or slowly varying (<1 Hz) reference applications. For AC-coupled use, the HZ7B1RE-E requires external filtering to preserve its noise benefit.

What is the maximum reverse current specification for HZ7B1RE-E?

The HZ7B1RE-E specifies a maximum reverse current (I_R) of 1 μA at V_R = 2.0 V, measured at T_a = 25°C. This ultra-low leakage supports energy-efficient designs such as battery-powered data loggers and always-on sensor nodes. The value is confirmed in the "Electrical Characteristics" table on page 2 of the official Renesas datasheet REJ03G0182-0300, and remains stable across the full −55°C to +125°C storage range.

Is HZ7B1RE-E compatible with automated PCB assembly processes?

Yes, the HZ7B1RE-E uses the standard DO-35 axial package (JEITA code GRZZ0002ZB-A) with 2.0 mm body diameter and 26 mm length, fully compatible with wave soldering, reflow-compatible epoxy adhesives, and pick-and-place feeders using tape-and-reel packaging (not supplied standard; reel packaging available on request). Lead spacing matches IPC-7351 guidelines for axial components, and the navy blue cathode band provides unambiguous orientation marking for AOI inspection.

How does the noise performance of HZ7B1RE-E compare to generic Zener diodes?

The HZ7B1RE-E delivers approximately 1/3 to 1/10 the noise level of standard HZ-series Zeners, as explicitly stated in the "Features" section of the Renesas datasheet. This reduction stems from proprietary silicon planar processing and optimized junction geometry-not external filtering. In practice, this translates to >10 dB improvement in integrated noise (0.1–10 Hz) versus equivalents like BZX55C6V8, making the HZ7B1RE-E measurable in low-frequency precision applications such as thermocouple amplifiers and digital multimeter reference stages.