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

Renesas HZS3A3TA-E

Name: HZS3A3TA-E
Brand: Renesas
SKU: HZS3A3TA-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HZS3A3TA-E

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: -

Datasheet:: HZS3A3TA-E.pdf

Description:: DIODE ZENER 0.4W

Quantity:: RFQ Add To RFQ list

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Inventory:10,000

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Product details

Overview

HZS3A3TA-E from Renesas Electronics is a silicon planar Zener diode designed for precision voltage regulation in low-power stabilized power supplies, with a nominal zener voltage of 3.3 V (min 3.3 V / max 3.5 V), 400 mW power dissipation, and dynamic resistance of 5 Ω at 5 mA test current.

For engineers reviewing the HZS3A3TA-E datasheet, HZS3A3TA-E pinout, HZS3A3TA-E application, or HZS3A3TA-E equivalent, this device serves as a compact, low-leakage, low-impedance voltage reference for analog sensing circuits, microcontroller reset supervision, and biasing networks where tight tolerance and thermal stability are required.

Technical Context

The HZS3A3TA-E operates as a two-terminal shunt regulator, maintaining stable output voltage across its cathode-anode terminals under reverse-biased conditions. Its zener voltage is specified at 5 mA test current with ±0.2 V tolerance (3.3–3.5 V) and exhibits low temperature coefficient behavior typical of mid-voltage Zeners (~−0.02 %/°C).

It features low leakage current (≤25 µA at 0.5 V reverse bias), low dynamic impedance (5 Ω), and is rated for junction temperatures up to 200°C - enabling reliable operation in industrial ambient environments. The device uses a silicon planar construction with epoxy-molded MHD package for mechanical robustness and automated insertion compatibility.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.3 V min / 3.5 V max at I_Z = 5 mA - defines precise clamping threshold for overvoltage protection or reference generation.
Power Dissipation (P_d)	400 mW - supports continuous regulation in space-constrained PCB layouts without forced cooling.
Dynamic Resistance (r_d)	5 Ω at I_Z = 5 mA - ensures minimal output voltage variation under load transients.
Reverse Leakage (I_R)	≤25 µA at V_R = 0.5 V - reduces quiescent current loss in battery-powered or low-power systems.
Junction Temperature (T_j)	200°C maximum - enables use in high-temperature industrial enclosures or near heat-generating components.
Package Type	MHD (JEITA GRZZ0002ZC-A) - 5 mm pitch, axial leaded, epoxy-molded package compatible with high-speed automatic insertion equipment.

Pinout & Package

Package: MHD (JEITA GRZZ0002ZC-A), axial-leaded, epoxy-molded, 5 mm pitch, 2.0 mm diameter body, 26 mm lead length. Cathode identified by lake-blue band.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Reference Output Terminal	Connected to regulated voltage node; polarity-sensitive - must be held at higher potential than anode during regulation.
2 (Anode)	Ground/Return Terminal	Typically tied to system ground or common return path; completes shunt current path during regulation.

Key Features

Feature	Design Value
Low Zener Impedance	5 Ω at 5 mA - minimizes output voltage deviation under varying load currents, critical for stable ADC reference or sensor excitation.
Wide Zener Voltage Range Coverage	Part of HZS Series spanning 1.6 V to 38 V - allows standardized sourcing and layout reuse across multiple voltage rails in same design family.
High-Temperature Junction Rating	200°C max T_j - supports deployment in automotive engine compartments, industrial motor drives, and enclosed power supplies without derating.
Low Reverse Leakage	≤25 µA at 0.5 V - preserves battery life in always-on monitoring circuits and avoids false triggering in reset supervisor applications.

Applications

Microcontroller Reset Circuit	Analog Sensor Biasing
Use Scenario: Provides clean, stable 3.3 V reference to enable microcontroller reset ICs (e.g., MAX809) during power-up and brown-out events. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise threshold for reset assertion timing and release hysteresis. Use Value: Ensures deterministic reset behavior across temperature (−55°C to +175°C storage) and supply ripple, preventing erratic MCU boot sequences.	Use Scenario: Supplies regulated excitation voltage to resistive temperature detectors (RTDs) or bridge-based pressure sensors in industrial instrumentation. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing bulkier IC references where 1% accuracy suffices. Use Value: Maintains sensor linearity and measurement repeatability despite input supply fluctuations, with <5 Ω output impedance minimizing loading error.
Low-Power Voltage Clamp	Overvoltage Protection Node
Use Scenario: Clamps transient spikes on 3.3 V I/O lines in portable medical devices to protect downstream logic inputs from ESD or coupling noise. IC Role / Device Role / Timing Role: Fast-reacting shunt limiter absorbing short-duration energy surges before they reach sensitive CMOS inputs. Use Value: Delivers sub-100 ns response with ≤25 µA leakage - preserving signal integrity while adding negligible standby current burden.	Use Scenario: Guards analog front-end inputs in data acquisition modules against accidental 5 V or 12 V misconnection during field servicing. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of precision op-amps or ADC drivers. Use Value: Withstands 400 mW peak dissipation and 200°C junction rating, enabling robust fault handling without thermal runaway or parametric shift.

Microcontroller Reset Circuit

Analog Sensor Biasing

Use Scenario: Provides clean, stable 3.3 V reference to enable microcontroller reset ICs (e.g., MAX809) during power-up and brown-out events.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise threshold for reset assertion timing and release hysteresis.

Use Value: Ensures deterministic reset behavior across temperature (−55°C to +175°C storage) and supply ripple, preventing erratic MCU boot sequences.

Use Scenario: Supplies regulated excitation voltage to resistive temperature detectors (RTDs) or bridge-based pressure sensors in industrial instrumentation.

IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing bulkier IC references where 1% accuracy suffices.

Use Value: Maintains sensor linearity and measurement repeatability despite input supply fluctuations, with <5 Ω output impedance minimizing loading error.

Low-Power Voltage Clamp

Overvoltage Protection Node

Use Scenario: Clamps transient spikes on 3.3 V I/O lines in portable medical devices to protect downstream logic inputs from ESD or coupling noise.

IC Role / Device Role / Timing Role: Fast-reacting shunt limiter absorbing short-duration energy surges before they reach sensitive CMOS inputs.

Use Value: Delivers sub-100 ns response with ≤25 µA leakage - preserving signal integrity while adding negligible standby current burden.

Use Scenario: Guards analog front-end inputs in data acquisition modules against accidental 5 V or 12 V misconnection during field servicing.

IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of precision op-amps or ADC drivers.

Use Value: Withstands 400 mW peak dissipation and 200°C junction rating, enabling robust fault handling without thermal runaway or parametric shift.

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
1N4728A (ON Semiconductor)	3.3 V nominal, ±5% tolerance (3.135–3.465 V), 1 W power rating, DO-41 package.	Higher power capability but larger footprint and looser tolerance; less suitable for space-constrained PCBs requiring tight regulation.	Select when higher surge energy absorption is needed and board area permits DO-41; not drop-in due to different package and thermal profile.
BZX55-C3V3 (Vishay)	3.3 V nominal, ±5% tolerance, 500 mW rating, DO-35 package, 10 Ω dynamic resistance.	Higher rd degrades regulation accuracy under load; wider tolerance increases calibration overhead in precision analog stages.	Acceptable for cost-sensitive consumer applications where ±5% V_Z and 10 Ω r_d are acceptable; requires layout adaptation for DO-35 leads.

Compared with 1N4728A and BZX55-C3V3, the HZS3A3TA-E offers tighter voltage tolerance (±0.2 V vs. ±5%), lower dynamic impedance (5 Ω vs. ≥10 Ω), and MHD packaging optimized for automated assembly - making it preferable for industrial-grade embedded systems demanding repeatable performance and manufacturing efficiency.

Availability

HZS3A3TA-E is available at Aetrix Electronics and suitable for industrial control panels, programmable logic controller (PLC) I/O modules, and medical diagnostic equipment requiring stable component supply with traceable sourcing and long-term lifecycle support.

Supply support for HZS3A3TA-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 global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.

The HZS Series is part of Renesas' discrete portfolio targeting precision voltage stabilization in power management subsystems - engineered for reliability, thermal resilience, and compatibility with high-volume automated manufacturing processes.

FAQ

What is the exact zener voltage range for HZS3A3TA-E?

The HZS3A3TA-E has a guaranteed zener voltage range of 3.3 V minimum to 3.5 V maximum when tested at 5 mA zener current and 25°C ambient temperature. This 0.2 V window reflects its "A3" grade designation within the HZS3 family and enables tighter regulation than standard ±5% Zeners.

Is HZS3A3TA-E suitable for automotive applications?

The HZS3A3TA-E is classified as a Standard-grade Renesas product, intended for industrial, office, and communications equipment - not qualified for automotive use per Renesas' quality grading policy. For AEC-Q200-compliant alternatives, consult Renesas' automotive-qualified Zener portfolio or contact their sales office directly.

What is the maximum reverse leakage current specification for HZS3A3TA-E?

The HZS3A3TA-E specifies a maximum reverse leakage current of 25 µA at 0.5 V reverse voltage and 25°C. This low leakage supports ultra-low-power designs such as battery-backed real-time clocks or always-on sensor nodes where standby current must remain below 100 µA.

Does HZS3A3TA-E have a defined temperature coefficient?

Yes - while not explicitly listed for HZS3A3TA-E individually, the HZS Series datasheet shows that 3.3 V-grade devices exhibit a zener voltage temperature coefficient of approximately −0.02 %/°C (or −0.66 mV/°C), indicating slight negative drift with rising temperature - consistent with mid-voltage silicon Zeners.

Can HZS3A3TA-E replace a 3.3 V TL431 shunt regulator?

No - the HZS3A3TA-E is a passive two-terminal Zener diode, whereas the TL431 is an active three-terminal adjustable shunt regulator with internal reference and amplifier. HZS3A3TA-E lacks programmability, current-sinking capability beyond its power rating, and precision feedback paths - it serves only as a fixed-voltage clamp, not a regulated reference source.

HZS3A3TA-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:: -

HZS3A3TA-E FAQ

1.How can I place an order for HZS3A3TA-E through Aetrix?

Please submit a Request for Quotation (RFQ) for HZS3A3TA-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 HZS3A3TA-E reliable?

The price and inventory of HZS3A3TA-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZS3A3TA-E is usually 5 days.

3.What payment methods are accepted for HZS3A3TA-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZS3A3TA-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HZS3A3TA-E?

HZS3A3TA-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HZS3A3TA-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 HZS3A3TA-E?

For technical support, including HZS3A3TA-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZS3A3TA-E requirements.

6.How does Aetrix verify that HZS3A3TA-E is sourced from the original manufacturer or authorized distributors?

All HZS3A3TA-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 HZS3A3TA-E meets industry standards.

7.What is the process for return or replacement of HZS3A3TA-E?

All HZS3A3TA-E units undergo pre-shipment inspection (PSI). If there is an issue with HZS3A3TA-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 HZS3A3TA-E part is unused and in its original packaging.

Return procedure for HZS3A3TA-E:

1.Submit a request within 90 days.

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

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