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

Renesas HZS9A1TD-E

Name: HZS9A1TD-E
Brand: Renesas
SKU: HZS9A1TD-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HZS9A1TD-E

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: -

Datasheet:: HZS9A1TD-E.pdf

Description:: DIODE ZENER 0.4W

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Inventory:29,150

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Product details

Overview

HZS9A1TD-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 9.3 V to 9.7 V (Grade C3), 5 mA test current, 20 Ω dynamic resistance, and 400 mW maximum power dissipation in MHD package. It serves as a shunt reference in feedback loops of DC-DC converters and linear regulators for industrial instrumentation and embedded control systems.

For engineers reviewing the HZS9A1TD-E datasheet, HZS9A1TD-E pinout, HZS9A1TD-E application, or HZS9A1TD-E equivalent, key selection criteria include verified zener voltage tolerance (±0.4 V at 5 mA), low dynamic impedance for ripple suppression, thermal stability across −55°C to +175°C storage range, and compatibility with 5 mm-pitch automated insertion processes.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse-biased current above its breakdown threshold. Its planar junction construction ensures consistent V_Z distribution and low leakage (<25 µA at 0.5 V) across the full operating temperature range.

The HZS9A1TD-E exhibits a negative zener voltage temperature coefficient of approximately −0.04 %/°C (−4 mV/°C) near 9.5 V, enabling predictable drift behavior in ambient-varying environments. Junction temperature is rated to 200°C, supporting high-reliability operation in thermally constrained PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	9.3 V to 9.7 V at I_Z = 5 mA - defines precise regulation point for feedback networks requiring ±0.4 V tolerance.
Dynamic Resistance (r_d)	20 Ω max at I_Z = 5 mA - ensures minimal output voltage variation under load transients in reference circuits.
Power Dissipation (P_d)	400 mW max at T_a = 25°C - supports continuous operation in compact SMT footprints without forced cooling.
Reverse Leakage (I_R)	25 µA max at V_R = 0.5 V - guarantees low quiescent current draw in battery-backed or energy-sensitive applications.
Junction Temperature (T_j)	200°C - enables reliable function in high-temperature industrial enclosures and near power components.
Storage Temperature (T_stg)	−55°C to +175°C - qualifies for extended environmental deployment in automotive under-hood and factory automation settings.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Zener cathode terminal	Connected to regulated output node; polarity marking (lake blue band) identifies this terminal for correct orientation in shunt configuration.
2 (Anode)	Zener anode terminal	Connected to ground or lower-potential rail; completes reverse-bias path required for zener conduction and voltage clamping.

Key Features

Feature	Design Value
Low zener impedance	20 Ω max ensures <10 mV output shift per 200 µA load change - critical for high-accuracy analog references.
Wide zener voltage range coverage	9.3–9.7 V grade (C3) provides tight binning for production consistency in voltage-sensing feedback paths.
High thermal endurance	200°C junction rating allows operation adjacent to MOSFETs, transformers, or other heat-generating components.
Automated assembly compatibility	5 mm pitch and standardized MHD dimensions support direct integration into high-volume PCB assembly lines.

Applications

Industrial Power Monitoring	Embedded Microcontroller Reference
Use Scenario: Voltage supervision circuit in programmable logic controller (PLC) power module detecting undervoltage lockout thresholds. IC Role / Device Role / Timing Role: Shunt reference providing stable 9.5 V trigger point for comparator input. Use Value: Tight ±0.4 V V_Z tolerance ensures repeatable trip points across temperature and unit-to-unit variation.	Use Scenario: External reference for 10-bit ADC in HVAC control board measuring 0–24 V DC supply rails. IC Role / Device Role / Timing Role: Precision voltage clamp generating known reference potential for analog front-end scaling. Use Value: 20 Ω r_d minimizes reference error during ADC sampling bursts, preserving measurement linearity.
DC-DC Converter Feedback	Overvoltage Protection Clamp
Use Scenario: Secondary-side voltage sensing in isolated flyback converter regulating 12 V output. IC Role / Device Role / Timing Role: Zener element in optocoupler feedback divider network setting regulation setpoint. Use Value: Low leakage (<25 µA) prevents bias current errors in high-impedance divider arms, improving regulation accuracy.	Use Scenario: Transient overvoltage clamp on RS-485 bus termination resistor node. IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting surge energy above 9.7 V to ground. Use Value: 400 mW P_d rating sustains short-duration surges without thermal runaway or parameter shift.

Industrial Power Monitoring

Embedded Microcontroller Reference

Use Scenario: Voltage supervision circuit in programmable logic controller (PLC) power module detecting undervoltage lockout thresholds.

IC Role / Device Role / Timing Role: Shunt reference providing stable 9.5 V trigger point for comparator input.

Use Value: Tight ±0.4 V V_Z tolerance ensures repeatable trip points across temperature and unit-to-unit variation.

Use Scenario: External reference for 10-bit ADC in HVAC control board measuring 0–24 V DC supply rails.

IC Role / Device Role / Timing Role: Precision voltage clamp generating known reference potential for analog front-end scaling.

Use Value: 20 Ω r_d minimizes reference error during ADC sampling bursts, preserving measurement linearity.

DC-DC Converter Feedback

Overvoltage Protection Clamp

Use Scenario: Secondary-side voltage sensing in isolated flyback converter regulating 12 V output.

IC Role / Device Role / Timing Role: Zener element in optocoupler feedback divider network setting regulation setpoint.

Use Value: Low leakage (<25 µA) prevents bias current errors in high-impedance divider arms, improving regulation accuracy.

Use Scenario: Transient overvoltage clamp on RS-485 bus termination resistor node.

IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting surge energy above 9.7 V to ground.

Use Value: 400 mW P_d rating sustains short-duration surges without thermal runaway or parameter shift.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C9V1 (Nexperia)	9.1 V nominal V_Z, ±5% tolerance (±0.46 V), SOT-23 package, 300 mW P_d	Suitable for space-constrained PCBs but lacks MHD's 5 mm pitch compatibility and higher P_d.	Select when board real estate is limited and thermal margin permits lower power rating.
1N4739A (ON Semiconductor)	9.1 V nominal V_Z, ±5% tolerance, DO-41 package, 1 W P_d, higher r_d (10 Ω typical)	Higher power handling but larger through-hole footprint incompatible with automated MHD insertion.	Choose for legacy through-hole designs or where >400 mW transient dissipation is required.

Compared with BZX84-C9V1 and 1N4739A, the HZS9A1TD-E offers tighter V_Z binning (±0.4 V vs. ±5%), optimized MHD packaging for high-speed assembly, and balanced thermal performance - making it preferred for industrial-grade surface-mount power regulation where precision and manufacturability are jointly prioritized.

Availability

HZS9A1TD-E is available at Aetrix Electronics and suitable for industrial power monitoring, embedded microcontroller reference, DC-DC converter feedback, and overvoltage protection applications requiring stable component supply, long-term lifecycle continuity, and traceable sourcing.

Supply support for HZS9A1TD-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 belongs to Renesas' discrete voltage reference product line, engineered specifically for stable, low-drift shunt regulation in cost-sensitive yet reliability-critical power supply subsystems.

FAQ

What is the exact zener voltage range specified for HZS9A1TD-E?

The HZS9A1TD-E is graded as C3 within the HZS9 family and has a guaranteed zener voltage range of 9.3 V to 9.7 V when tested at 5 mA DC current, as confirmed in the Renesas REJ03G0184-0500 datasheet revision 5.00. This ±0.4 V tolerance supports high-accuracy regulation without external trimming. The HZS9A1TD-E maintains this specification across its qualified operating ambient temperature range.

Does HZS9A1TD-E support automated PCB assembly?

Yes, the HZS9A1TD-E uses the MHD package (JEITA code GRZZ0002ZC-A) with standardized 5 mm lead pitch and axial lead geometry, explicitly designed for compatibility with high-speed automatic insertion equipment. Its 2.0 mm body diameter and 26.0 mm lead length meet industry requirements for wave soldering and mechanical handling - a key feature documented in the HZS Series datasheet for HZS9A1TD-E.

What is the maximum power dissipation rating for HZS9A1TD-E?

The HZS9A1TD-E has a maximum power dissipation (P_d) of 400 mW at T_a = 25°C, as stated in the Absolute Maximum Ratings table of the official Renesas datasheet. Derating is required above 25°C ambient, following the published power dissipation vs. ambient temperature curve. This rating enables reliable operation in compact industrial PCB layouts without heatsinking for continuous DC regulation loads.

Is HZS9A1TD-E suitable for automotive applications?

The HZS9A1TD-E is classified as a "Standard" quality grade device per Renesas' internal grading system and is intended for applications including industrial robots, office equipment, and communications gear - not for automotive or safety-critical systems. It is not AEC-Q200 qualified, and Renesas explicitly restricts use in transportation equipment without prior written consent. For automotive designs, alternate AEC-Q200-compliant Zener diodes must be selected instead of HZS9A1TD-E.

What is the dynamic resistance value of HZS9A1TD-E and why does it matter?

The HZS9A1TD-E has a maximum dynamic resistance (r_d) of 20 Ω at I_Z = 5 mA, measured under DC conditions. This low impedance directly determines how well the diode rejects input ripple and load-induced variations - for example, a 200 µA change in zener current causes only ~4 mV output shift. That performance makes HZS9A1TD-E suitable for precision analog references where stability under dynamic conditions is essential.

HZS9A1TD-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:: -

HZS9A1TD-E FAQ

1.How can I place an order for HZS9A1TD-E through Aetrix?

Please submit a Request for Quotation (RFQ) for HZS9A1TD-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 HZS9A1TD-E reliable?

The price and inventory of HZS9A1TD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZS9A1TD-E is usually 5 days.

3.What payment methods are accepted for HZS9A1TD-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZS9A1TD-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HZS9A1TD-E?

HZS9A1TD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HZS9A1TD-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 HZS9A1TD-E?

For technical support, including HZS9A1TD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZS9A1TD-E requirements.

6.How does Aetrix verify that HZS9A1TD-E is sourced from the original manufacturer or authorized distributors?

All HZS9A1TD-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 HZS9A1TD-E meets industry standards.

7.What is the process for return or replacement of HZS9A1TD-E?

All HZS9A1TD-E units undergo pre-shipment inspection (PSI). If there is an issue with HZS9A1TD-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 HZS9A1TD-E part is unused and in its original packaging.

Return procedure for HZS9A1TD-E:

1.Submit a request within 90 days.

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

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