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

Renesas HZ7C1-E

Name: HZ7C1-E
Brand: Renesas
SKU: HZ7C1-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HZ7C1-E

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: -

Datasheet:: HZ7C1-E.pdf

Description:: DIODE ZENER

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Inventory:17,500

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Product details

Overview

HZ7C1-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), 5 mW reverse current test condition, 3.5 Ω dynamic resistance at 5 mA, and 500 mW maximum power dissipation in DO-35 package.

For engineers reviewing the HZ7C1-E datasheet, HZ7C1-E pinout, HZ7C1-E application, or HZ7C1-E equivalent, this discrete Zener diode supports low-leakage, low-impedance voltage reference design in space-constrained linear regulators, sensor biasing circuits, and overvoltage protection stages where thermal stability and tight voltage tolerance are critical.

Technical Context

The HZ7C1-E operates as a two-terminal voltage reference device using silicon planar junction technology, optimized for DC-stabilized operation with low zener impedance (3.5 Ω) and minimal temperature coefficient (±0.04 %/°C typical near 7.5 V). Its DO-35 glass package enables reliable thermal conduction and stable junction behavior up to 175°C junction temperature.

It is rated for 500 mW power dissipation at 25°C ambient, derating linearly above 25°C per Fig.3, and exhibits reverse leakage ≤1 µA at VR = 5 V. The device is not intended for transient suppression or high-current shunt regulation - its design targets precision DC reference and low-noise biasing applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	7.5 V min / 7.9 V max at I_Z = 5 mA - defines regulated output range for reference design
Dynamic Resistance (r_d)	3.5 Ω max at I_Z = 5 mA - ensures low output impedance for stable regulation under load variation
Reverse Current (I_R)	≤1 µA max at V_R = 5 V - guarantees low quiescent power loss in standby or high-impedance bias networks
Power Dissipation (P_d)	500 mW max at T_a = 25°C - sets absolute thermal limit for PCB layout and heatsinking requirements
Junction Temperature (T_j)	−55°C to +175°C - enables operation in industrial and automotive under-hood environments
Package	DO-35 (JEITA GRZZ0002ZB-A) - standard axial glass package with cathode band marking and 2.0 mm body diameter

Pinout & Package

DO-35 glass axial package with 2 mm body diameter and 26 mm overall length; cathode identified by navy blue band; terminals are non-polarized but functionally asymmetric (cathode must be biased positive relative to anode for zener operation).

Pin/Terminal	Circuit Role	Design Meaning
1 (banded end)	Cathode	Connected to higher potential node in reverse-biased configuration; carries regulated output current
2 (non-banded end)	Anode	Connected to lower potential (typically ground or return path); completes zener conduction loop

Key Features

Feature	Design Value
Low zener impedance	3.5 Ω max enables <10 mV output shift under ±1 mA load change - critical for analog sensor references
Tight zener voltage tolerance	Grade C (±0.4 V at 7.5 V) supports ±5.3% regulation without external trimming
Low leakage current	≤1 µA at 5 V reverse bias minimizes error in high-impedance divider networks and battery-powered circuits
Stable temperature coefficient	≈±0.04 %/°C near 7.5 V reduces drift to <±3 mV/°C - suitable for unregulated ambient environments

Applications

Industrial Sensor Biasing	Low-Power Voltage Reference
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) and bridge-based pressure sensors in factory automation modules. IC Role / Device Role / Timing Role: Zener reference source for analog front-end biasing - replaces IC voltage references where cost and size are constrained. Use Value: Delivers 7.5 V ±0.4 V with <3.5 Ω output impedance, enabling <0.1% linearity error in 12-bit ADC systems without active regulation.	Use Scenario: Generating precise reference for comparator hysteresis thresholds and window detection in battery management ICs. IC Role / Device Role / Timing Role: Passive voltage clamp defining upper/lower trip points - eliminates need for external DAC or resistor ladder. Use Value: Low 1 µA leakage prevents loading of high-Z comparator inputs, preserving threshold accuracy across −40°C to +85°C.
Linear Regulator Shunt Element	Overvoltage Protection Clamp
Use Scenario: Shunt regulator stage in low-current 5 V → 3.3 V conversion for microcontroller reset circuitry. IC Role / Device Role / Timing Role: Zener-controlled shunt path that diverts excess current when input exceeds 7.5 V - used with series resistor. Use Value: 500 mW rating allows safe dissipation of >60 mA shunt current, supporting robust brown-out immunity without thermal runaway.	Use Scenario: Input-stage clamp protecting op-amp inputs from ESD-induced transients in automotive infotainment audio interfaces. IC Role / Device Role / Timing Role: Fast-reacting voltage limiter activated before internal ESD structures trigger - placed upstream of signal chain. Use Value: 3.5 Ω dynamic impedance limits clamping overshoot to <100 mV above 7.5 V during 100 ns transients, preserving signal integrity.

Industrial Sensor Biasing

Low-Power Voltage Reference

Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) and bridge-based pressure sensors in factory automation modules.

IC Role / Device Role / Timing Role: Zener reference source for analog front-end biasing - replaces IC voltage references where cost and size are constrained.

Use Value: Delivers 7.5 V ±0.4 V with <3.5 Ω output impedance, enabling <0.1% linearity error in 12-bit ADC systems without active regulation.

Use Scenario: Generating precise reference for comparator hysteresis thresholds and window detection in battery management ICs.

IC Role / Device Role / Timing Role: Passive voltage clamp defining upper/lower trip points - eliminates need for external DAC or resistor ladder.

Use Value: Low 1 µA leakage prevents loading of high-Z comparator inputs, preserving threshold accuracy across −40°C to +85°C.

Linear Regulator Shunt Element

Overvoltage Protection Clamp

Use Scenario: Shunt regulator stage in low-current 5 V → 3.3 V conversion for microcontroller reset circuitry.

IC Role / Device Role / Timing Role: Zener-controlled shunt path that diverts excess current when input exceeds 7.5 V - used with series resistor.

Use Value: 500 mW rating allows safe dissipation of >60 mA shunt current, supporting robust brown-out immunity without thermal runaway.

Use Scenario: Input-stage clamp protecting op-amp inputs from ESD-induced transients in automotive infotainment audio interfaces.

IC Role / Device Role / Timing Role: Fast-reacting voltage limiter activated before internal ESD structures trigger - placed upstream of signal chain.

Use Value: 3.5 Ω dynamic impedance limits clamping overshoot to <100 mV above 7.5 V during 100 ns transients, preserving signal integrity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4733A (ON Semiconductor)	Zener voltage 5.1 V (fixed), 10 Ω r_d, 1 W P_d, DO-41 package	Higher power, looser tolerance (±5%), different voltage - requires redesign of bias network	Select only if 5.1 V reference and higher power margin are required; not drop-in for 7.5 V designs
BZX55-C7V5 (Vishay)	Zener voltage 7.5 V (±5%), 15 Ω r_d, 500 mW P_d, DO-35 package	Same package and nominal voltage, but higher impedance and wider tolerance - degrades reference accuracy	Acceptable for non-critical biasing where ±5% V_Z and >10 mV/1 mA regulation error are tolerable

Compared with HZ7C1-E, the 1N4733A offers higher power but mismatched voltage and larger package, while BZX55-C7V5 matches voltage and package but sacrifices regulation precision and dynamic response - HZ7C1-E remains optimal for applications demanding tight-tolerance, low-impedance 7.5 V reference.

Availability

HZ7C1-E is available at Aetrix Electronics and suitable for industrial sensor biasing, low-power voltage reference, and linear regulator shunt element applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for HZ7C1-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog and power devices, and timing solutions for industrial, automotive, and infrastructure markets.

The HZ Series Zener diodes were developed specifically for high-stability, low-power DC voltage reference and regulation in space-constrained industrial control and instrumentation systems.

FAQ

What is the exact zener voltage range specified for HZ7C1-E?

The HZ7C1-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 Grade C tolerance (±0.4 V) is confirmed in the Electrical Characteristics table on page 3 of REJ03G0180-0600 Rev.6.00. The HZ7C1-E achieves tighter regulation than generic 7.5 V Zeners due to its planar junction process and controlled grading.

Is HZ7C1-E compatible with automated SMT assembly?

No, the HZ7C1-E uses a DO-35 axial glass package with leads intended for through-hole mounting or manual placement. It is not designed for reflow soldering or pick-and-place handling. For SMT-compatible alternatives, consider Renesas' surface-mount HZS series or other manufacturers' SOD-123 Zener diodes - but those require voltage and impedance verification against HZ7C1-E specs.

What is the maximum allowable reverse current before breakdown in HZ7C1-E?

The HZ7C1-E does not specify a "maximum allowable reverse current before breakdown" because it is designed to operate in controlled reverse breakdown. Its rated test current is I_Z = 5 mA, and it sustains stable regulation up to its 500 mW power limit - i.e., ~66 mA at 7.5 V. Exceeding P_d risks thermal runaway. The 1 µA reverse current spec applies at V_R = 5 V, well below V_Z.

Does HZ7C1-E meet RoHS or lead-free requirements?

Yes, the HZ7C1-E complies with RoHS Directive 2011/65/EU and is lead-free. Renesas confirms RoHS compliance for the entire HZ Series in product change notices and packaging data sheets. The DO-35 glass body contains no restricted substances above threshold limits, and solderability is maintained with SnAgCu reflow profiles for through-hole wave soldering.

How does temperature affect the zener voltage of HZ7C1-E?

The HZ7C1-E exhibits a zener voltage temperature coefficient of approximately ±0.04 %/°C near 7.5 V, as shown in Fig.2 of the datasheet. This translates to ±3 mV/°C drift - significantly lower than many general-purpose Zeners. At 85°C ambient, the total V_Z shift remains within ±0.18 V of its 25°C value, making it suitable for unheated industrial enclosures without active compensation.

HZ7C1-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:: -

HZ7C1-E FAQ

1.How can I place an order for HZ7C1-E through Aetrix?

Please submit a Request for Quotation (RFQ) for HZ7C1-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 HZ7C1-E reliable?

The price and inventory of HZ7C1-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ7C1-E is usually 5 days.

3.What payment methods are accepted for HZ7C1-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ7C1-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HZ7C1-E?

HZ7C1-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HZ7C1-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 HZ7C1-E?

For technical support, including HZ7C1-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ7C1-E requirements.

6.How does Aetrix verify that HZ7C1-E is sourced from the original manufacturer or authorized distributors?

All HZ7C1-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 HZ7C1-E meets industry standards.

7.What is the process for return or replacement of HZ7C1-E?

All HZ7C1-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ7C1-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 HZ7C1-E part is unused and in its original packaging.

Return procedure for HZ7C1-E:

1.Submit a request within 90 days.

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

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