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

Renesas HZ7A1-E

Name: HZ7A1-E
Brand: Renesas
SKU: HZ7A1-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HZ7A1-E

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: -

Datasheet:: HZ7A1-E.pdf

Description:: DIODE ZENER

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Inventory:6,500

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Product details

Overview

HZ7A1-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 7.5 V (min 7.5 V, max 7.9 V), 500 mW power dissipation, and 15 Ω dynamic resistance at 5 mA test current.

For engineers reviewing the HZ7A1-E datasheet, HZ7A1-E pinout, HZ7A1-E application, or HZ7A1-E equivalent, this device supports DC voltage reference design, overvoltage protection circuits, and analog signal conditioning where tight tolerance and low impedance are required.

Technical Context

The HZ7A1-E operates as a two-terminal shunt regulator, maintaining stable output voltage across varying load currents via controlled reverse-biased breakdown. Its zener voltage is specified at 5 mA test current with ±0.4 V tolerance and exhibits a positive temperature coefficient of +3.5 mV/°C.

It features low leakage current (≤1 µA at VR = 5 V), low dynamic impedance (15 Ω typical), and is rated for junction temperatures up to 175°C - enabling reliable operation in compact, thermally constrained PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	7.5 V min to 7.9 V max at I_Z = 5 mA - defines precise regulation threshold for feedback or clamping
Power Dissipation (P_d)	500 mW at T_a = 25°C - sets maximum continuous DC power handling without derating
Dynamic Resistance (r_d)	15 Ω max at I_Z = 5 mA - ensures minimal output voltage variation under load transients
Reverse Current (I_R)	≤1 µA at V_R = 5 V - guarantees negligible standby leakage in high-impedance bias networks
Junction Temperature (T_j)	−55°C to +175°C - supports industrial and automotive under-hood ambient conditions
Package	DO-35 (GRZZ0002ZB-A) - standard axial-leaded glass package compatible with manual and wave soldering

Pinout & Package

DO-35 glass package with axial leads: cathode identified by navy-blue band; anode and cathode terminals are non-polarized in forward bias but function as voltage-reference node (cathode) and return (anode) in reverse-biased regulation mode.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (banded end)	Zener reference node	Connected to regulated voltage rail; carries reverse current during regulation
Anode	Reference return / ground reference	Provides current path to ground or lower potential; establishes reference polarity

Key Features

Feature	Design Value
Low dynamic impedance	15 Ω max enables stable regulation under ±10% load current variation
Tight zener voltage tolerance	±0.4 V window at 7.5–7.9 V supports accurate 5 V or 3.3 V LDO feedback referencing
High thermal stability	+3.5 mV/°C tempco allows predictable drift compensation in temperature-critical references
Low leakage current	≤1 µA at 5 V reverse bias minimizes error in high-resistance divider networks

Applications

Voltage Reference for Op-Amp Circuits	Overvoltage Clamp in Sensor Interfaces
Use Scenario: Precision DC reference for instrumentation amplifier biasing and ADC reference scaling in data acquisition systems. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 7.5 V node for analog front-end calibration. Use Value: 15 Ω dynamic resistance and ≤1 µA leakage ensure <0.1% reference error contribution in 100 kΩ divider networks.	Use Scenario: Protection clamp on 5 V supply rail against ESD or transient overshoot in industrial sensor nodes. IC Role / Device Role / Timing Role: Passive overvoltage limiter diverting excess energy to ground when rail exceeds 7.9 V. Use Value: 500 mW rating sustains 100 ms transients at 100 mA surge without degradation; DO-35 package fits space-constrained sensor PCBs.
Feedback Node in Linear Regulators	Temperature-Compensated Bias Generator
Use Scenario: Zener-based feedback element in discrete adjustable linear regulators driving 100 mA loads. IC Role / Device Role / Timing Role: Voltage-setting component defining output voltage via resistor divider ratio. Use Value: Tight 7.5–7.9 V tolerance reduces output voltage spread to ±1.5% across production units.	Use Scenario: Paired with NTC thermistor in bias network for temperature-stable current sources in LED drivers. IC Role / Device Role / Timing Role: Positive-tempco reference compensating negative-tempco of semiconductor junctions. Use Value: +3.5 mV/°C coefficient matches typical NTC curves, enabling ±2% bias stability over −25°C to +85°C.

Voltage Reference for Op-Amp Circuits

Overvoltage Clamp in Sensor Interfaces

Use Scenario: Precision DC reference for instrumentation amplifier biasing and ADC reference scaling in data acquisition systems.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 7.5 V node for analog front-end calibration.

Use Value: 15 Ω dynamic resistance and ≤1 µA leakage ensure <0.1% reference error contribution in 100 kΩ divider networks.

Use Scenario: Protection clamp on 5 V supply rail against ESD or transient overshoot in industrial sensor nodes.

IC Role / Device Role / Timing Role: Passive overvoltage limiter diverting excess energy to ground when rail exceeds 7.9 V.

Use Value: 500 mW rating sustains 100 ms transients at 100 mA surge without degradation; DO-35 package fits space-constrained sensor PCBs.

Feedback Node in Linear Regulators

Temperature-Compensated Bias Generator

Use Scenario: Zener-based feedback element in discrete adjustable linear regulators driving 100 mA loads.

IC Role / Device Role / Timing Role: Voltage-setting component defining output voltage via resistor divider ratio.

Use Value: Tight 7.5–7.9 V tolerance reduces output voltage spread to ±1.5% across production units.

Use Scenario: Paired with NTC thermistor in bias network for temperature-stable current sources in LED drivers.

IC Role / Device Role / Timing Role: Positive-tempco reference compensating negative-tempco of semiconductor junctions.

Use Value: +3.5 mV/°C coefficient matches typical NTC curves, enabling ±2% bias stability over −25°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
1N4733A	5.1 V nominal, 10% tolerance, 17 Ω r_d, DO-41 package	Lower voltage grade; larger package increases board area by 30%	Select when 5.1 V reference is acceptable and higher power margin (1 W) is needed
BZX55C7V5	7.5 V nominal, ±5% tolerance (7.13–7.88 V), 15 Ω r_d, DO-35 package	Wider voltage tolerance; identical footprint and thermal rating	Choose for cost-sensitive designs where ±5% regulation accuracy suffices

Compared with HZ7A1-E, the 1N4733A offers higher power but mismatched voltage, while BZX55C7V5 matches voltage and package but sacrifices tolerance control - making HZ7A1-E optimal for precision 7.5 V references where ±0.4 V window and low leakage are critical.

Availability

HZ7A1-E is available at Aetrix Electronics and suitable for stabilized power supplies, analog sensor interfaces, and precision voltage reference circuits requiring stable component supply and long-term parametric consistency.

Supply support for HZ7A1-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 manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

HZ7A1-E belongs to the HZ Series silicon planar Zener diodes - engineered for high-precision, low-drift DC voltage stabilization in space- and power-constrained applications.

FAQ

What is the exact zener voltage range for HZ7A1-E?

The HZ7A1-E has a guaranteed zener voltage range of 7.5 V minimum to 7.9 V maximum when tested at I_Z = 5 mA and T_a = 25°C. This 0.4 V window reflects its "A1" grade designation within the HZ7 family and ensures tight regulation for feedback and reference applications.

Does HZ7A1-E support surface-mount assembly?

No, HZ7A1-E uses a DO-35 axial-glass package with leaded terminations and is intended for through-hole mounting only. It is not compatible with reflow or paste-based SMT processes. For SMT alternatives, consider Renesas' HZ7A1F series in SOD-123 or similar RoHS-compliant Zener variants.

What is the maximum reverse leakage current for HZ7A1-E?

The maximum reverse leakage current for HZ7A1-E is 1 µA at V_R = 5 V and T_a = 25°C. This low leakage ensures minimal error injection in high-impedance voltage divider networks and makes HZ7A1-E suitable for battery-powered or ultra-low-power reference designs.

Can HZ7A1-E be used in temperature-compensated circuits?

Yes, HZ7A1-E exhibits a positive temperature coefficient of +3.5 mV/°C, which is documented in the HZ Series datasheet Figure 2. This predictable drift enables intentional pairing with negative-tempco components (e.g., NTC thermistors or bipolar junctions) to build stable bias generators across industrial temperature ranges.

Is HZ7A1-E RoHS compliant?

Yes, HZ7A1-E complies with RoHS Directive 2011/65/EU as confirmed by Renesas' material declarations and packaging code GRZZ0002ZB-A. The DO-35 glass package contains no lead in solderable terminations, and the device meets exemption 7a for lead in glass.

HZ7A1-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:: -

HZ7A1-E FAQ

1.How can I place an order for HZ7A1-E through Aetrix?

Please submit a Request for Quotation (RFQ) for HZ7A1-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 HZ7A1-E reliable?

The price and inventory of HZ7A1-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ7A1-E is usually 5 days.

3.What payment methods are accepted for HZ7A1-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ7A1-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HZ7A1-E?

HZ7A1-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HZ7A1-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 HZ7A1-E?

For technical support, including HZ7A1-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ7A1-E requirements.

6.How does Aetrix verify that HZ7A1-E is sourced from the original manufacturer or authorized distributors?

All HZ7A1-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 HZ7A1-E meets industry standards.

7.What is the process for return or replacement of HZ7A1-E?

All HZ7A1-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ7A1-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 HZ7A1-E part is unused and in its original packaging.

Return procedure for HZ7A1-E:

1.Submit a request within 90 days.

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

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