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

Renesas HZ7A2L-E

Name: HZ7A2L-E
Brand: Renesas
SKU: HZ7A2L-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HZ7A2L-E

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: -

Datasheet:: HZ7A2L-E.pdf

Description:: DIODE ZENER

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Product details

Overview

HZ7A2L-E from Renesas is a silicon planar Zener diode engineered for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 6.4–6.7 V at 0.5 mA test current, dynamic resistance of 60 Ω, maximum power dissipation of 400 mW, and junction temperature rating up to 175°C - deployed in reference supplies for ADCs, sensor signal conditioning, and low-drift op-amp bias networks.

For engineers reviewing the HZ7A2L-E datasheet, HZ7A2L-E pinout, HZ7A2L-E application, or HZ7A2L-E equivalent, key selection criteria include its low-noise performance (1/3–1/10 that of standard HZ series), tight zener voltage tolerance, DO-35 package compatibility with through-hole PCB layouts, and thermal stability across −55°C to +175°C storage range.

Technical Context

The HZ7A2L-E operates as a two-terminal voltage reference device using silicon planar junction technology optimized for reduced flicker and thermal noise. Its zener breakdown mechanism is stabilized by low leakage (<1 μA at VR = 2.0 V) and tightly controlled dynamic impedance (60 Ω at IZ = 0.5 mA).

Designed for DC-biased operation only, it exhibits a zener voltage temperature coefficient of approximately −0.04 %/°C (−2.5 mV/°C) near 6.5 V, enabling predictable drift compensation in temperature-sensitive references. The device is not rated for AC or transient surge conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	6.4–6.7 V at I_Z = 0.5 mA - defines stable reference point for low-power analog circuits
Dynamic Resistance (r_d)	60 Ω at I_Z = 0.5 mA - ensures minimal output voltage variation under load current changes
Power Dissipation (P_d)	400 mW max at T_a = 25°C - supports continuous operation in compact through-hole designs
Reverse Leakage Current (I_R)	≤1 μA at V_R = 2.0 V - preserves accuracy in high-impedance bias networks
Junction Temperature (T_j)	175°C max - enables reliable operation in thermally constrained industrial enclosures
Storage Temperature (T_stg)	−55°C to +175°C - compatible with extended environmental qualification requirements

Pinout & Package

Package: DO-35 glass axial lead package (JEITA code GRZZ0002ZB-A), orange body color, navy blue cathode band. Dimensions: φD = 2.0 mm, L = 26.0 mm, E = 4.2 mm; mass ≈ 0.13 g.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Zener voltage reference terminal	Connected to regulated output node; polarity must be observed to maintain reverse-bias operation
2 (Anode)	Reference ground return path	Completes current loop; low-impedance connection required to minimize noise coupling

Key Features

Feature	Design Value
Low-noise zener operation	Noise level ~1/3–1/10 that of standard HZ series - critical for high-resolution data acquisition front-ends
Tight zener voltage tolerance	±0.15 V window at 6.5 V nominal - reduces calibration burden in factory-trimmed systems
Stable dynamic impedance	60 Ω maintained across 0.5 mA operating point - ensures consistent regulation under varying load
High thermal endurance	175°C max junction temperature - supports use in sealed or convection-limited enclosures

Applications

High-Resolution ADC Reference	Precision Op-Amp Biasing
Use Scenario: Providing stable 6.5 V reference for 16-bit SAR ADCs in industrial process monitoring systems. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing V_REF input for analog-to-digital conversion. Use Value: Low dynamic resistance (60 Ω) minimizes code-dependent reference droop; low noise prevents LSB uncertainty in digitized signals.	Use Scenario: Setting precise bias points for rail-to-rail input op-amps in strain-gauge amplifier stages. IC Role / Device Role / Timing Role: Zener-based fixed-voltage node supplying non-inverting input offset and common-mode level. Use Value: Tight V_Z tolerance (6.4–6.7 V) ensures repeatable gain calibration; low leakage avoids input bias current errors.
Sensor Signal Conditioning	Low-Drift Voltage Monitor
Use Scenario: Regulating excitation voltage for RTD bridges in temperature transmitters operating from 12 V supply rails. IC Role / Device Role / Timing Role: Low-noise shunt regulator stabilizing bridge supply independent of load current variations. Use Value: Reduced diode noise directly improves SNR of microvolt-level bridge outputs; 400 mW P_d accommodates worst-case bridge current.	Use Scenario: Monitoring 6 V system rails in battery-powered IoT nodes with ultra-low quiescent current budgets. IC Role / Device Role / Timing Role: Passive overvoltage detection node triggering comparator thresholds via resistive divider. Use Value: Stable V_Z enables accurate trip-point setting; −0.04 %/°C tempco allows single-point calibration across −40°C to +85°C.

High-Resolution ADC Reference

Precision Op-Amp Biasing

Use Scenario: Providing stable 6.5 V reference for 16-bit SAR ADCs in industrial process monitoring systems.

IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing V_REF input for analog-to-digital conversion.

Use Value: Low dynamic resistance (60 Ω) minimizes code-dependent reference droop; low noise prevents LSB uncertainty in digitized signals.

Use Scenario: Setting precise bias points for rail-to-rail input op-amps in strain-gauge amplifier stages.

IC Role / Device Role / Timing Role: Zener-based fixed-voltage node supplying non-inverting input offset and common-mode level.

Use Value: Tight V_Z tolerance (6.4–6.7 V) ensures repeatable gain calibration; low leakage avoids input bias current errors.

Sensor Signal Conditioning

Low-Drift Voltage Monitor

Use Scenario: Regulating excitation voltage for RTD bridges in temperature transmitters operating from 12 V supply rails.

IC Role / Device Role / Timing Role: Low-noise shunt regulator stabilizing bridge supply independent of load current variations.

Use Value: Reduced diode noise directly improves SNR of microvolt-level bridge outputs; 400 mW P_d accommodates worst-case bridge current.

Use Scenario: Monitoring 6 V system rails in battery-powered IoT nodes with ultra-low quiescent current budgets.

IC Role / Device Role / Timing Role: Passive overvoltage detection node triggering comparator thresholds via resistive divider.

Use Value: Stable V_Z enables accurate trip-point setting; −0.04 %/°C tempco allows single-point calibration across −40°C to +85°C.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4734A	Zener voltage 5.6 V ±5%, r_d = 9 Ω, P_d = 1 W, DO-41 package	Higher power, lower impedance, but higher noise and looser V_Z tolerance	Select when higher current drive or tighter r_d is prioritized over noise and precision
BZX85C6V2	Zener voltage 6.2 V ±5%, r_d = 10 Ω, P_d = 1.3 W, DO-41 package	Higher power rating and lower impedance, but no low-noise specification or tight V_Z binning	Choose for general-purpose regulation where noise floor is not critical and layout accommodates larger DO-41 footprint

Compared with 1N4734A and BZX85C6V2, the HZ7A2L-E trades higher dynamic impedance and lower power rating for significantly lower noise and tighter zener voltage control - making it uniquely suitable for metrology-grade analog references rather than bulk power regulation.

Availability

HZ7A2L-E is available at Aetrix Electronics and suitable for high-precision voltage reference, sensor excitation, and low-noise analog signal conditioning requiring stable component supply and long-term parametric consistency.

Supply support for HZ7A2L-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 mixed-signal devices, and power management ICs for industrial, automotive, and infrastructure applications.

The HZ-L Series was developed specifically for low-noise, high-stability voltage reference applications in precision measurement and instrumentation systems - emphasizing zener voltage accuracy, thermal predictability, and noise reduction over raw power handling.

FAQ

What is the zener voltage range specified for the HZ7A2L-E?

The HZ7A2L-E has a guaranteed zener voltage range of 6.4 V to 6.7 V when tested at a zener current of 0.5 mA and ambient temperature of 25°C. This narrow 0.3 V window reflects Renesas' binning for precision reference use, and the value is confirmed in the Electrical Characteristics table on page 2 of REJ03G0182-0300 Rev.3.00.

Is the HZ7A2L-E suitable for surface-mount assembly?

No, the HZ7A2L-E uses a DO-35 glass axial package with leads designed for through-hole mounting only. Its JEITA package code GRZZ0002ZB-A and mechanical dimensions (L = 26.0 mm, φD = 2.0 mm) confirm axial lead configuration - it is incompatible with reflow or wave soldering processes used for SMT.

Does the HZ7A2L-E have a specified noise spectral density?

The HZ7A2L-E datasheet does not provide numerical noise spectral density (nV/√Hz), but explicitly states its noise level is "approximately 1/3–1/10 lower than the HZ series" - a relative metric verified across the full HZ-L family. This comparative claim is based on measured broadband noise under standardized DC bias conditions per Renesas characterization methodology.

What is the maximum allowable reverse current before breakdown for the HZ7A2L-E?

The HZ7A2L-E specifies a maximum reverse leakage current (I_R) of 1 μA at V_R = 2.0 V, measured at 25°C. This parameter defines the upper limit of non-breakdown conduction; operation above this voltage (but below V_Z) remains within safe limits as long as power dissipation stays within 400 mW and junction temperature remains ≤175°C.

Can the HZ7A2L-E be used in AC-coupled or switching applications?

No - the HZ7A2L-E is characterized and rated for DC operation only, as explicitly noted in the datasheet ("Tested with DC"). Its dynamic resistance, temperature coefficient, and noise specifications assume steady-state reverse bias. Use in AC, PWM, or fast-transient circuits is unsupported and may result in unpredictable regulation or accelerated degradation.

HZ7A2L-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:: -

HZ7A2L-E FAQ

1.How can I place an order for HZ7A2L-E through Aetrix?

Please submit a Request for Quotation (RFQ) for HZ7A2L-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 HZ7A2L-E reliable?

The price and inventory of HZ7A2L-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ7A2L-E is usually 5 days.

3.What payment methods are accepted for HZ7A2L-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ7A2L-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HZ7A2L-E?

HZ7A2L-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HZ7A2L-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 HZ7A2L-E?

For technical support, including HZ7A2L-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ7A2L-E requirements.

6.How does Aetrix verify that HZ7A2L-E is sourced from the original manufacturer or authorized distributors?

All HZ7A2L-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 HZ7A2L-E meets industry standards.

7.What is the process for return or replacement of HZ7A2L-E?

All HZ7A2L-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ7A2L-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 HZ7A2L-E part is unused and in its original packaging.

Return procedure for HZ7A2L-E:

1.Submit a request within 90 days.

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

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