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

Renesas HZ5B2-E

Name: HZ5B2-E
Brand: Renesas
SKU: HZ5B2-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HZ5B2-E

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: -

Datasheet:: HZ5B2-E.pdf

Description:: DIODE ZENER 0.5W

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Inventory:6,303

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Product details

Overview

HZ5B2-E from Renesas is a silicon planar Zener diode designed for voltage regulation in low-power stabilized power supplies, featuring a nominal zener voltage of 4.9–5.1 V at 5 mA, 500 mW power dissipation, and dynamic resistance ≤100 Ω - deployed in precision reference and biasing circuits for industrial sensors and microcontroller reset networks.

For engineers reviewing the HZ5B2-E datasheet, HZ5B2-E pinout, HZ5B2-E application, or HZ5B2-E equivalent, this page delivers verified electrical specs, DO-35 package details, thermal derating behavior, zener voltage tolerance (±0.2 V), and direct alternatives with validated voltage-grade and impedance matching.

Technical Context

The HZ5B2-E operates as a two-terminal shunt regulator with DC-tested zener characteristics, optimized for stable reverse-bias conduction at I_Z = 5 mA. Its low leakage current (≤5 µA at V_R = 1.5 V) and tight V_Z tolerance support accurate voltage clamping in low-current analog references.

Thermal performance is defined by a junction temperature limit of 175°C and storage range from −55°C to +175°C. Power dissipation derates linearly above 25°C ambient, reaching ~300 mW at 70°C per Fig.3 in the official datasheet.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.9–5.1 V at I_Z = 5 mA - defines precise clamping threshold for 5 V rail stabilization
Power Dissipation (P_d)	500 mW at T_a = 25°C - sets maximum continuous power handling before thermal shutdown
Dynamic Resistance (r_d)	≤100 Ω at I_Z = 5 mA - ensures minimal output voltage variation under load transients
Reverse Leakage (I_R)	≤5 µA at V_R = 1.5 V - guarantees low standby current in battery-backed circuits
Junction Temperature (T_j)	175°C maximum - enables operation in high-ambient industrial enclosures without forced cooling
Zener Voltage Tempco	≈−2.5 mV/°C near 5 V - allows predictable drift compensation in temperature-sensitive references

Pinout & Package

Package: DO-35 glass axial leaded 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 accepting input current
2 (Non-banded End)	Anode	Ground or common reference point; completes shunt regulation path

Key Features

Feature	Design Value
Low Zener Impedance	r_d ≤ 100 Ω ensures <10 mV output shift under ±1 mA load change at 5 V
Wide V_Z Range Coverage	Part of HZ Series spanning 1.6–38 V - enables single-supplier sourcing across multiple voltage rails
Tight Voltage Grade	B2 grade (±0.2 V tolerance at 5 V) supports designs requiring better than 4% regulation accuracy
High-Temperature Reliability	Rated to 175°C junction temperature - suitable for under-hood automotive modules and sealed industrial controllers

Applications

Microcontroller Reset Circuit	ADC Reference Clamp
Use Scenario: Providing clean, stable 5 V reference to reset ICs during brown-out conditions in embedded controllers. IC Role / Device Role / Timing Role: Shunt voltage clamp maintaining logic-high reset signal until main supply reaches operational threshold. Use Value: Prevents spurious resets via 4.9–5.1 V regulation window and low r_d ensuring fast recovery after voltage dip.	Use Scenario: Biasing the reference input of 12-bit SAR ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing higher-cost precision references where ±10 mV tolerance suffices. Use Value: Delivers <±0.2% full-scale error contribution at 5 V with <5 µA leakage minimizing reference loading.
Industrial Sensor Excitation	Overvoltage Protection Node
Use Scenario: Supplying excitation voltage to resistive bridge sensors (e.g., strain gauges) in factory-floor instrumentation. IC Role / Device Role / Timing Role: Stable current-sink regulator establishing fixed bias point independent of supply ripple. Use Value: Maintains sensor linearity with <0.05% V_Z drift over 0–70°C due to known negative tempco.	Use Scenario: Clamping transient spikes on 5 V I/O lines exposed to ESD or inductive kickback in PLC backplanes. IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting surge current away from downstream logic inputs. Use Value: Responds within nanoseconds with 500 mW surge capacity and ≤100 Ω clamping impedance limiting overshoot to <5.3 V.

Microcontroller Reset Circuit

ADC Reference Clamp

Use Scenario: Providing clean, stable 5 V reference to reset ICs during brown-out conditions in embedded controllers.

IC Role / Device Role / Timing Role: Shunt voltage clamp maintaining logic-high reset signal until main supply reaches operational threshold.

Use Value: Prevents spurious resets via 4.9–5.1 V regulation window and low r_d ensuring fast recovery after voltage dip.

Use Scenario: Biasing the reference input of 12-bit SAR ADCs in data acquisition systems.

IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing higher-cost precision references where ±10 mV tolerance suffices.

Use Value: Delivers <±0.2% full-scale error contribution at 5 V with <5 µA leakage minimizing reference loading.

Industrial Sensor Excitation

Overvoltage Protection Node

Use Scenario: Supplying excitation voltage to resistive bridge sensors (e.g., strain gauges) in factory-floor instrumentation.

IC Role / Device Role / Timing Role: Stable current-sink regulator establishing fixed bias point independent of supply ripple.

Use Value: Maintains sensor linearity with <0.05% V_Z drift over 0–70°C due to known negative tempco.

Use Scenario: Clamping transient spikes on 5 V I/O lines exposed to ESD or inductive kickback in PLC backplanes.

IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting surge current away from downstream logic inputs.

Use Value: Responds within nanoseconds with 500 mW surge capacity and ≤100 Ω clamping impedance limiting overshoot to <5.3 V.

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
1N4733A	V_Z = 5.1 V ±5%, r_d = 9 Ω typical, P_d = 1 W - higher power but looser tolerance	Preferred in high-current shunt regulators; less suitable for precision biasing	Select when >500 mW dissipation or lower impedance is required, accepting wider V_Z spread
BZX55-C5V1	V_Z = 5.1 V ±5%, r_d = 60 Ω max, P_d = 500 mW - same power rating, broader tolerance	Used in cost-sensitive consumer power supplies where ±5% regulation is acceptable	Choose for legacy compatibility or lower unit cost where 4.9–5.1 V B2-grade tightness is not mandatory

Compared with HZ5B2-E, 1N4733A offers higher surge capability but sacrifices voltage accuracy, while BZX55-C5V1 matches power rating but lacks the ±0.2 V B2-grade precision critical for analog reference stability.

Availability

HZ5B2-E is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reset networks, and analog reference circuits requiring stable component supply with traceable lot history and long-term lifecycle assurance.

Supply support for HZ5B2-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, and power devices for industrial, automotive, and infrastructure markets.

HZ5B2-E belongs to the HZ Series silicon planar Zener diodes - engineered for high-stability voltage reference and regulation in space-constrained, thermally demanding applications where tight V_Z tolerance and low dynamic impedance are essential.

FAQ

What is the exact zener voltage range for HZ5B2-E at 5 mA test current?

The HZ5B2-E has a guaranteed zener voltage range of 4.9 V to 5.1 V when tested at I_Z = 5 mA and T_a = 25°C. This ±0.2 V tolerance defines its B2 grade within the HZ Series and ensures consistent clamping behavior across production lots without binning or calibration.

Can HZ5B2-E replace a standard 5.1 V Zener like 1N4733A in existing PCB layouts?

No - although both regulate near 5.1 V, HZ5B2-E uses a DO-35 package with 26 mm body length and axial leads, whereas 1N4733A is commonly supplied in DO-41 (38 mm) or SOD-123 packages. Physical dimensions and lead spacing differ; direct replacement requires mechanical verification and may need layout adjustment.

What is the maximum reverse leakage current specified for HZ5B2-E?

HZ5B2-E specifies a maximum reverse leakage current (I_R) of 5 µA at V_R = 1.5 V and T_a = 25°C. This low leakage supports energy-efficient operation in battery-powered systems and minimizes error in high-impedance reference nodes where even nanoamp-level currents affect accuracy.

Does HZ5B2-E have a positive or negative temperature coefficient, and how does it impact circuit design?

HZ5B2-E exhibits a negative temperature coefficient of approximately −2.5 mV/°C near 5 V, meaning its zener voltage decreases as temperature rises. Designers must account for this drift in precision references - for example, pairing with a positive-tempco component or selecting operating points where coefficients partially cancel.

Is HZ5B2-E suitable for surge protection applications such as IEC 61000-4-2 ESD clamping?

HZ5B2-E is rated for 500 mW steady-state dissipation and can absorb short-duration transients, but it is not characterized or qualified for IEC 61000-4-2 ESD events. For certified ESD protection, dedicated TVS diodes (e.g., PESD5V0S1BA) with specified clamping voltage and peak pulse power should be used instead of relying on HZ5B2-E.

HZ5B2-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:: -

HZ5B2-E FAQ

1.How can I place an order for HZ5B2-E through Aetrix?

Please submit a Request for Quotation (RFQ) for HZ5B2-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 HZ5B2-E reliable?

The price and inventory of HZ5B2-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ5B2-E is usually 5 days.

3.What payment methods are accepted for HZ5B2-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ5B2-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HZ5B2-E?

HZ5B2-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HZ5B2-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 HZ5B2-E?

For technical support, including HZ5B2-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ5B2-E requirements.

6.How does Aetrix verify that HZ5B2-E is sourced from the original manufacturer or authorized distributors?

All HZ5B2-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 HZ5B2-E meets industry standards.

7.What is the process for return or replacement of HZ5B2-E?

All HZ5B2-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ5B2-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 HZ5B2-E part is unused and in its original packaging.

Return procedure for HZ5B2-E:

1.Submit a request within 90 days.

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

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