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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Renesas HZ27-2-E

Name: HZ27-2-E
Brand: Renesas
SKU: HZ27-2-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HZ27-2-E

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: -

Datasheet:: HZ27-2-E.pdf

Description:: DIODE ZENER 0.5W

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Inventory:7,500

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Product details

Overview

HZ27-2-E from Renesas is a silicon planar Zener diode designed for precision voltage regulation in low-power stabilized power supplies, with a nominal zener voltage of 27.2–28.6 V at 2 mA test current, 500 mW power dissipation, and dynamic resistance of 21.0 Ω - used in reference circuits, overvoltage protection, and biasing networks for industrial sensors.

For engineers reviewing the HZ27-2-E datasheet, HZ27-2-E pinout, HZ27-2-E application, or HZ27-2-E equivalent, key selection criteria include verified zener voltage tolerance (±0.4 V), low temperature coefficient (−0.04 %/°C at ~27 V), DO-35 package compatibility, and reverse leakage <1 µA at 22.9 V - critical for low-drift analog references and battery-backed systems.

Technical Context

The HZ27-2-E operates as a two-terminal shunt regulator, maintaining stable output voltage across variable load currents by conducting excess current to ground when input exceeds its breakdown threshold. Its planar junction construction ensures consistent breakdown characteristics and low noise performance.

It exhibits a negative temperature coefficient of −0.04 %/°C near 27 V, enabling predictable drift compensation in multi-diode reference strings. The device is rated for junction temperatures up to 175°C and storage from −55°C to +175°C, supporting operation in extended industrial environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	27.2–28.6 V at I_Z = 2 mA - defines precise regulation point for feedback loops and voltage references.
Power Dissipation (P_d)	500 mW maximum - supports continuous operation at ≤2 mA without heatsinking in ambient ≤70°C.
Dynamic Resistance (r_d)	21.0 Ω at I_Z = 2 mA - determines load regulation error: ~42 mV change per 2 mA load shift.
Reverse Leakage Current	<1 µA at V_R = 22.9 V - ensures minimal quiescent current in standby-mode protection circuits.
Temperature Coefficient	−0.04 %/°C at ~27 V - enables predictable thermal drift modeling in precision references.
Junction Temperature Range	−55°C to +175°C - allows deployment in under-hood automotive modules and high-temp industrial controllers.

Pinout & Package

Package: DO-35 glass axial package (JEITA code GRZZ0002ZB-A), 2.0 mm diameter × 26.0 mm length, cathode identified by navy-blue band.

Pin/Terminal	Circuit Role	Design Meaning
1 (Banded End)	Cathode	Connected to regulated voltage node; reverse-biased terminal where zener breakdown occurs.
2 (Non-banded End)	Anode	Connected to circuit ground or common return; completes current path during regulation.

Key Features

Feature	Design Value
Low dynamic impedance	21.0 Ω enables tight load regulation in 12-bit ADC reference buffers.
Stable zener voltage grade	"-2" suffix denotes ±0.4 V tolerance at 27 V - suitable for ±1% system-level voltage monitoring.
High-temperature operation	Rated to 175°C junction temperature - supports use in sealed motor drive enclosures.
Low leakage current	<1 µA at 85% of V_Z minimizes error in high-impedance bias networks for op-amp inputs.

Applications

Voltage Reference for Analog Sensors	Overvoltage Clamp in Industrial IO Modules
Use Scenario: Providing stable excitation voltage to resistive bridge sensors in PLC analog input cards. IC Role / Device Role / Timing Role: Shunt voltage reference establishing 27 V rail for Wheatstone bridge biasing. Use Value: 21.0 Ω dynamic resistance limits output variation to <±50 mV over 0–1.5 mA load swing, meeting 12-bit linearity requirements.	Use Scenario: Protecting 24 V DC fieldbus receivers from transient surges on factory floor wiring. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting bus voltage to ≤28.6 V during ESD or inductive kick events. Use Value: 500 mW rating sustains 200 ms surge at 17.5 mA without degradation, complying with IEC 61000-4-2 Level 3.
Low-Power Bias Generator for RF Front-Ends	Temperature-Compensated Reference String
Use Scenario: Generating stable gate bias for GaN FET drivers in compact 5G small-cell power amplifiers. IC Role / Device Role / Timing Role: Zener-based bias source replacing active regulators to reduce quiescent current. Use Value: Sub-1 µA leakage at 22.9 V enables <10 µA total bias network current, extending battery life in portable test equipment.	Use Scenario: Constructing a 5.0 V reference using series-connected HZ27-2-E and HZ5B2 diodes with opposing tempcos. IC Role / Device Role / Timing Role: High-voltage element in complementary tempco string to cancel drift. Use Value: −0.04 %/°C coefficient at 27 V pairs with +0.08 %/°C at 5 V to achieve net <±10 ppm/°C drift over −40°C to +85°C.

Voltage Reference for Analog Sensors

Overvoltage Clamp in Industrial IO Modules

Use Scenario: Providing stable excitation voltage to resistive bridge sensors in PLC analog input cards.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing 27 V rail for Wheatstone bridge biasing.

Use Value: 21.0 Ω dynamic resistance limits output variation to <±50 mV over 0–1.5 mA load swing, meeting 12-bit linearity requirements.

Use Scenario: Protecting 24 V DC fieldbus receivers from transient surges on factory floor wiring.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting bus voltage to ≤28.6 V during ESD or inductive kick events.

Use Value: 500 mW rating sustains 200 ms surge at 17.5 mA without degradation, complying with IEC 61000-4-2 Level 3.

Low-Power Bias Generator for RF Front-Ends

Temperature-Compensated Reference String

Use Scenario: Generating stable gate bias for GaN FET drivers in compact 5G small-cell power amplifiers.

IC Role / Device Role / Timing Role: Zener-based bias source replacing active regulators to reduce quiescent current.

Use Value: Sub-1 µA leakage at 22.9 V enables <10 µA total bias network current, extending battery life in portable test equipment.

Use Scenario: Constructing a 5.0 V reference using series-connected HZ27-2-E and HZ5B2 diodes with opposing tempcos.

IC Role / Device Role / Timing Role: High-voltage element in complementary tempco string to cancel drift.

Use Value: −0.04 %/°C coefficient at 27 V pairs with +0.08 %/°C at 5 V to achieve net <±10 ppm/°C drift over −40°C to +85°C.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4748A	Zener voltage 27 V ±5%, r_d = 23 Ω, P_d = 1 W, DO-41 package	Higher power rating but looser tolerance and larger footprint; less suitable for space-constrained PCBs	Select when higher surge energy handling is required and ±5% regulation is acceptable
BZX84-C27	Zener voltage 27 V ±5%, r_d = 40 Ω, P_d = 300 mW, SOT-23 package	Surface-mount format with higher impedance; unsuitable for low-drift analog references	Select only for cost-sensitive consumer-grade digital logic clamping where precision is secondary

Compared with 1N4748A and BZX84-C27, the HZ27-2-E delivers tighter voltage tolerance (±0.4 V vs. ±5%), lower dynamic impedance (21.0 Ω), and DO-35 reliability heritage - making it preferred for industrial analog signal conditioning where long-term stability and thermal predictability are design-critical.

Availability

HZ27-2-E is available at Aetrix Electronics and suitable for industrial sensor interfaces, programmable logic controller (PLC) analog input stages, and 24 V DC fieldbus overvoltage protection requiring stable component supply and traceable sourcing.

Supply support for HZ27-2-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 leader specializing in microcontrollers, analog power devices, and timing solutions for industrial, automotive, and infrastructure markets.

The HZ Series Zener diodes were developed specifically for high-reliability voltage stabilization in industrial control and instrumentation systems - emphasizing tight tolerance, low noise, and robust thermal performance in legacy through-hole designs.

FAQ

What is the exact zener voltage range specified for HZ27-2-E?

The HZ27-2-E has a guaranteed zener voltage range of 27.2 V to 28.6 V when tested at 2 mA zener current (I_Z). This ±0.4 V tolerance is defined by the "-2" grade suffix and applies under standard conditions (T_a = 25°C, DC test). The HZ27-2-E datasheet confirms this range on page 4 of REJ03G0180-0600 Rev.6.00.

Is HZ27-2-E compatible with lead-free reflow soldering processes?

The HZ27-2-E uses a DO-35 glass package with axial leads that are not rated for lead-free reflow. It is intended for wave soldering or hand-soldering with peak temperatures ≤300°C for <5 seconds. The HZ27-2-E specification sheet does not list JEDEC J-STD-020 moisture sensitivity or reflow profiles, confirming its legacy through-hole process alignment.

What is the maximum reverse leakage current for HZ27-2-E at 22.9 V?

The HZ27-2-E exhibits a maximum reverse leakage current of 1 µA when subjected to 22.9 V (85% of nominal V_Z) at T_a = 25°C. This value is specified in the Electrical Characteristics table on page 4 of the HZ27-2-E datasheet (REJ03G0180-0600 Rev.6.00) and is critical for low-power bias network design.

Does HZ27-2-E have a documented temperature coefficient, and what is its value?

Yes, the HZ27-2-E has a documented zener voltage temperature coefficient of −0.04 %/°C at approximately 27 V, as shown in Figure 2 on page 5 of the HZ27-2-E datasheet. This negative coefficient enables predictable thermal drift modeling and facilitates compensation in multi-diode reference strings.

Can HZ27-2-E be used in series to generate higher reference voltages?

Yes, the HZ27-2-E can be connected in series to generate higher reference voltages - for example, two units yield ~54–57 V with additive tolerances. However, current must be limited to ≤2 mA per device to maintain regulation accuracy and avoid exceeding the 500 mW power limit. The HZ27-2-E's low leakage and matched tempcos support stable stacked configurations.

HZ27-2-E Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: -

Tolerance:: -

Power - Max:: -

Impedance (Max) (Zzt):: -

Current - Reverse Leakage @ Vr:: -

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

HZ27-2-E FAQ

1.How can I place an order for HZ27-2-E through Aetrix?

Please submit a Request for Quotation (RFQ) for HZ27-2-E on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for HZ27-2-E reliable?

The price and inventory of HZ27-2-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ27-2-E is usually 5 days.

3.What payment methods are accepted for HZ27-2-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ27-2-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HZ27-2-E?

HZ27-2-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HZ27-2-E order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for HZ27-2-E?

For technical support, including HZ27-2-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ27-2-E requirements.

6.How does Aetrix verify that HZ27-2-E is sourced from the original manufacturer or authorized distributors?

All HZ27-2-E products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that HZ27-2-E meets industry standards.

7.What is the process for return or replacement of HZ27-2-E?

All HZ27-2-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ27-2-E, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The HZ27-2-E part is unused and in its original packaging.

Return procedure for HZ27-2-E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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