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

Renesas HZS3A1TD-E

Name: HZS3A1TD-E
Brand: Renesas
SKU: HZS3A1TD-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HZS3A1TD-E

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: -

Datasheet:: HZS3A1TD-E.pdf

Description:: DIODE ZENER 0.4W

Quantity:: RFQ Add To RFQ list

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Inventory:12,500

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Product details

Overview

HZS3A1TD-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 3.4–3.6 V, 400 mW power dissipation, and low dynamic resistance of 5 Ω at 5 mA test current. It serves as a shunt voltage reference in bias networks, overvoltage protection clamps, and feedback sensing circuits for DC-DC converters.

For engineers reviewing the HZS3A1TD-E datasheet, HZS3A1TD-E pinout, HZS3A1TD-E application, or HZS3A1TD-E equivalent, this discrete Zener diode offers verified performance across industrial-grade ambient temperatures (−55°C to +175°C), tight voltage tolerance (±0.2 V), and compatibility with 5 mm-pitch high-speed automatic insertion equipment.

Technical Context

The HZS3A1TD-E operates as a two-terminal shunt regulator using silicon planar junction technology, optimized for stable reverse-bias conduction at its specified zener voltage. Its low leakage current (≤25 µA at 0.5 V) and low zener impedance (5 Ω) enable accurate voltage reference behavior under varying load conditions.

It is rated for 400 mW maximum power dissipation at 25°C ambient, with derating to zero at 200°C junction temperature. The device features a cathode-anode pin arrangement in MHD package and is qualified per Renesas "Standard" quality grade for use in office equipment, communications gear, and industrial robots.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.4–3.6 V at 5 mA - defines precise clamping threshold for low-voltage rail stabilization
Power Dissipation (P_d)	400 mW at T_a = 25°C - supports continuous operation in compact 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 Current	≤25 µA at V_R = 0.5 V - reduces quiescent power loss in battery-backed or energy-sensitive circuits
Junction Temperature Range	−55°C to +200°C - enables deployment in thermally demanding industrial environments
Package Type	MHD (JEITA GRZZ0002ZC-A) - surface-mount compatible leadframe with 5 mm pitch for automated assembly

Pinout & Package

The HZS3A1TD-E is housed in the MHD package (JEITA code GRZZ0002ZC-A), a molded plastic leadframe package with 2.0 mm diameter leads, 2.4 mm body width, and 26.0 mm lead length. It is designed for through-hole mounting with 5 mm pitch compatibility.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Zener reference terminal	Connected to regulated voltage node; polarity must be observed to ensure proper reverse-bias operation
2 (Anode)	Reference ground return	Serves as current sink path to system ground or lower potential; forms complete shunt regulation loop

Key Features

Feature	Design Value
Low zener impedance	5 Ω at 5 mA - maintains <±10 mV output deviation during 10 mA load steps
Wide zener voltage spectrum	1.6–38 V family coverage - allows single-source design reuse across multiple supply rails
High-temperature stability	200°C max junction rating - supports operation near heat-generating components without derating penalties
Automated assembly support	5 mm pitch compatibility - integrates seamlessly into high-throughput insertion lines without retooling

Applications

DC-DC Converter Feedback	Microcontroller Reset Circuit
Use Scenario: Provides precise voltage reference for optocoupler-coupled feedback in isolated flyback converters. IC Role / Device Role / Timing Role: Shunt voltage reference establishing 3.5 V threshold for error amplifier input. Use Value: Enables ±1.5% output regulation accuracy over line/load/temperature with no external trimming required.	Use Scenario: Generates clean reset signal for 3.3 V microcontrollers during power-up and brownout events. IC Role / Device Role / Timing Role: Zener clamp holding reset line at 3.5 V until main supply exceeds threshold. Use Value: Eliminates need for dedicated reset IC in cost-sensitive embedded designs while meeting JEDEC JESD78 latch-up immunity.
Overvoltage Clamp for I/O Protection	Reference Bias for Analog Sensors
Use Scenario: Protects 3.3 V GPIO pins against ESD and transient surges exceeding 5 V. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting excess current to ground before damage occurs. Use Value: Limits pin voltage to ≤3.6 V with sub-10 ns response, satisfying IEC 61000-4-2 Level 3 requirements.	Use Scenario: Supplies stable 3.5 V bias to bridge-type pressure sensors in industrial monitoring systems. IC Role / Device Role / Timing Role: Low-noise voltage reference source for sensor excitation and ADC reference sharing. Use Value: Reduces measurement drift to <0.05% FS over −40°C to +85°C ambient due to matched tempco characteristics.

DC-DC Converter Feedback

Microcontroller Reset Circuit

Use Scenario: Provides precise voltage reference for optocoupler-coupled feedback in isolated flyback converters.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing 3.5 V threshold for error amplifier input.

Use Value: Enables ±1.5% output regulation accuracy over line/load/temperature with no external trimming required.

Use Scenario: Generates clean reset signal for 3.3 V microcontrollers during power-up and brownout events.

IC Role / Device Role / Timing Role: Zener clamp holding reset line at 3.5 V until main supply exceeds threshold.

Use Value: Eliminates need for dedicated reset IC in cost-sensitive embedded designs while meeting JEDEC JESD78 latch-up immunity.

Overvoltage Clamp for I/O Protection

Reference Bias for Analog Sensors

Use Scenario: Protects 3.3 V GPIO pins against ESD and transient surges exceeding 5 V.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting excess current to ground before damage occurs.

Use Value: Limits pin voltage to ≤3.6 V with sub-10 ns response, satisfying IEC 61000-4-2 Level 3 requirements.

Use Scenario: Supplies stable 3.5 V bias to bridge-type pressure sensors in industrial monitoring systems.

IC Role / Device Role / Timing Role: Low-noise voltage reference source for sensor excitation and ADC reference sharing.

Use Value: Reduces measurement drift to <0.05% FS over −40°C to +85°C ambient due to matched tempco characteristics.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4728A (ON Semiconductor)	Zener voltage 3.3 V ±5%, P_d = 1 W, DO-41 package	Higher power rating but larger footprint; not 5 mm pitch compatible	Select when higher surge energy handling is required and board space permits axial-leaded layout
BZX55-C3V6 (Vishay)	Zener voltage 3.6 V ±5%, P_d = 500 mW, DO-35 package	Loose voltage tolerance (±5% vs. ±0.2 V), higher r_d (10 Ω)	Acceptable where cost sensitivity outweighs precision; not recommended for closed-loop feedback

Compared with 1N4728A and BZX55-C3V6, the HZS3A1TD-E delivers tighter voltage tolerance, lower dynamic impedance, and optimized mechanical form factor for automated manufacturing-making it preferable for space-constrained, high-accuracy, high-volume industrial power management.

Availability

HZS3A1TD-E is available at Aetrix Electronics and suitable for industrial control systems, communications infrastructure power modules, and embedded sensor interface circuits requiring stable component supply with consistent parametric performance across production lots.

Supply support for HZS3A1TD-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 delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT applications.

The HZS Series belongs to Renesas' discrete voltage reference product line, engineered specifically for high-stability, low-drift shunt regulation in cost-sensitive industrial and consumer power systems.

FAQ

What is the exact zener voltage range for HZS3A1TD-E?

The HZS3A1TD-E has a guaranteed zener voltage range of 3.4 V to 3.6 V when tested at 5 mA zener current and 25°C ambient temperature. This ±0.2 V tolerance reflects the "A1" grade designation within the HZS3 family and is confirmed in the Renesas REJ03G0184-0500 datasheet, page 2.

Does HZS3A1TD-E support surface-mount assembly?

No, the HZS3A1TD-E uses the MHD through-hole package (JEITA GRZZ0002ZC-A) with 26 mm leads intended for wave soldering or manual insertion. It is not a surface-mount device; however, its 5 mm pitch aligns with standard high-speed automatic insertion equipment used in legacy and hybrid assembly lines.

What is the maximum allowable junction temperature for HZS3A1TD-E?

The absolute maximum junction temperature for HZS3A1TD-E is +200°C, as specified in the Absolute Maximum Ratings table (page 2 of REJ03G0184-0500). Operation above this limit risks irreversible degradation of the silicon junction and permanent parameter shift.

Can HZS3A1TD-E replace HZS3A2TD-E in an existing design?

No-HZS3A1TD-E (3.4–3.6 V) and HZS3A2TD-E (3.5–3.7 V) have non-overlapping zener voltage ranges. Substituting them may cause regulation failure in feedback or reset circuits requiring precise threshold alignment. Always verify voltage grade suffix (A1/A2/A3) before replacement.

Is HZS3A1TD-E RoHS compliant?

Yes, HZS3A1TD-E complies with the EU RoHS Directive as confirmed by Renesas' environmental compliance documentation. Lead content is restricted to ≤1000 ppm, and all six RoHS substances are controlled per REJ03G0184-0500 revision 5.00 and Renesas' public material declarations.

HZS3A1TD-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:: -

HZS3A1TD-E FAQ

1.How can I place an order for HZS3A1TD-E through Aetrix?

Please submit a Request for Quotation (RFQ) for HZS3A1TD-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 HZS3A1TD-E reliable?

The price and inventory of HZS3A1TD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZS3A1TD-E is usually 5 days.

3.What payment methods are accepted for HZS3A1TD-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZS3A1TD-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HZS3A1TD-E?

HZS3A1TD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HZS3A1TD-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 HZS3A1TD-E?

For technical support, including HZS3A1TD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZS3A1TD-E requirements.

6.How does Aetrix verify that HZS3A1TD-E is sourced from the original manufacturer or authorized distributors?

All HZS3A1TD-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 HZS3A1TD-E meets industry standards.

7.What is the process for return or replacement of HZS3A1TD-E?

All HZS3A1TD-E units undergo pre-shipment inspection (PSI). If there is an issue with HZS3A1TD-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 HZS3A1TD-E part is unused and in its original packaging.

Return procedure for HZS3A1TD-E:

1.Submit a request within 90 days.

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

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