Renesas HZS27-2LTA-E

Overview

HZS27-2LTA-E from Renesas Electronics is a silicon planar Zener diode optimized for low-noise voltage reference and stabilization in precision analog circuits, featuring a nominal zener voltage of 26.2–27.6 V, 400 mW power dissipation, 24.0 Ω dynamic impedance at 0.5 mA test current, and ultra-low noise - approximately 1/3–1/10 that of the legacy HZ series - making it suitable for high-stability power supplies and sensor biasing in industrial instrumentation.

For engineers reviewing the HZS27-2LTA-E datasheet, HZS27-2LTA-E pinout, HZS27-2LTA-E application, or HZS27-2LTA-E equivalent, key selection criteria include its low-noise performance, tight zener voltage tolerance (±0.7 V), temperature coefficient behavior near zero crossing (~0.02 %/°C), and compatibility with 5 mm-pitch automated insertion in compact PCB layouts.

Technical Context

This device operates as a two-terminal voltage reference using silicon planar junction technology, with zener breakdown engineered for minimal excess noise generation and stable regulation under low-current conditions (IZ = 0.5 mA). Its low leakage (<1 μA at VR = 20.9 V) and low dynamic impedance support high PSRR in feedback paths of LDOs and op-amp references.

The HZS27-2LTA-E belongs to the HZS-L Series, which uses a standardized MHD package (JEITA GRZZ0002ZC-A) with axial leads and black cathode band marking. Its zener voltage temperature coefficient crosses zero near 27 V, minimizing drift over −25°C to +85°C ambient ranges in unheated enclosures.

Key Specifications

Pinout & Package

Package: MHD (JEITA GRZZ0002ZC-A), axial-leaded, plastic-molded, 2.0 mm diameter body, 26.0 mm lead length, 5 mm pitch compatible - designed for high-speed automatic insertion and wave soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5254B and BZX84-C27, the HZS27-2LTA-E delivers superior noise performance, tighter voltage binning, lower dynamic impedance, and industrial-grade packaging - making it the preferred choice for precision analog signal chains where reference integrity directly impacts measurement fidelity.

Availability

HZS27-2LTA-E is available at Aetrix Electronics and suitable for industrial sensor conditioning, precision ADC reference design, and LDO feedback stabilization requiring stable component supply, long-term obsolescence management, and traceable lot-level compliance documentation.

Supply support for HZS27-2LTA-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog and power devices, and SoC solutions for industrial, automotive, and infrastructure markets.

The HZS-L Series was developed specifically for low-noise, high-stability voltage reference applications in industrial instrumentation and precision analog systems - emphasizing zener voltage consistency, thermal drift minimization, and manufacturability in automated assembly lines.

FAQ

What is the exact zener voltage range for HZS27-2LTA-E at 0.5 mA test current?

The HZS27-2LTA-E has a guaranteed zener voltage range of 26.2 V to 27.6 V when tested at I_Z = 0.5 mA and T_a = 25°C, per Renesas datasheet REJ03G0166-0300 Rev.3.00. This 1.4 V span defines the middle bin (2L) of the HZS27 family and enables predictable system-level calibration without post-manufacture trimming. The HZS27-2LTA-E maintains this specification across its qualified operating temperature range.

Does HZS27-2LTA-E have a specified temperature coefficient, and how does it affect long-term stability?

Yes - the HZS27-2LTA-E exhibits a zener voltage temperature coefficient (γ_Z) of approximately +0.02 %/°C near its nominal 27 V operating point, as shown in Figure 2 of the datasheet. This near-zero crossing minimizes drift over −25°C to +85°C ambient conditions, supporting ±0.05% total variation in unheated enclosures. The HZS27-2LTA-E's low tempco directly contributes to long-term reference stability without active compensation circuitry.

Can HZS27-2LTA-E be used in surface-mount designs, or is it strictly through-hole?

HZS27-2LTA-E uses the MHD axial-leaded package (JEITA GRZZ0002ZC-A) and is designed for through-hole mounting with 5 mm pitch compatibility. It is not a surface-mount device and lacks SMT-compatible terminations. While reflow-compatible carriers exist for selective soldering, the HZS27-2LTA-E requires wave or hand-soldering processes. For SMT alternatives, Renesas does not offer an SMT variant of this specific bin within the HZS-L Series.

How does the noise performance of HZS27-2LTA-E compare to standard Zener diodes like the 1N47xx series?

The HZS27-2LTA-E achieves approximately 1/3 to 1/10 the noise level of conventional Zener diodes such as the 1N4750A (27 V), due to its optimized silicon planar junction structure and low-current operation. This is explicitly documented in the "Features" section of the Renesas datasheet. In practice, the HZS27-2LTA-E enables sub-μV RMS noise floors in precision references - a measurable advantage over generic Zeners when used in 20+ bit data acquisition systems.

Is HZS27-2LTA-E rated for automotive or safety-critical applications?

No - the HZS27-2LTA-E is classified as a "Standard" quality grade device per Renesas' product grading system (see Note 7 in the datasheet), intended for industrial, office, and communications equipment. It is not qualified for automotive (AEC-Q101), medical life-support, or aerospace applications. Use of the HZS27-2LTA-E in safety-critical systems requires explicit written consent from Renesas Electronics and additional system-level validation beyond the component's published specifications.