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

Renesas HZ12A1J-E

Name: HZ12A1J-E
Brand: Renesas
SKU: HZ12A1J-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HZ12A1J-E

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: HZ12A1J-E.pdf

Description:: DIODE ZENER 12V 1W DO35

Quantity:: RFQ Add To RFQ list

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Inventory:10,000

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Product details

Overview

HZ12A1J-E from Renesas Electronics is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog and reference circuits, featuring a nominal zener voltage of 11.6–12.1 V at 0.5 mA test current, dynamic resistance of 80 Ω max, power dissipation of 400 mW, and DO-35 glass package with navy-blue cathode band. It serves as a stable voltage reference in low-drift power supply feedback loops and sensor biasing networks.

For engineers reviewing the HZ12A1J-E datasheet, HZ12A1J-E pinout, HZ12A1J-E application, or HZ12A1J-E equivalent, key selection criteria include zener voltage tolerance (±0.5 V), low noise performance relative to legacy HZ series, temperature coefficient behavior near 12 V, and compatibility with through-hole PCB assembly using DO-35 footprint.

Technical Context

The HZ12A1J-E operates as a two-terminal, DC-biased voltage reference device with avalanche-based breakdown mechanism. Its zener voltage is specified at I_Z = 0.5 mA, and it exhibits a positive temperature coefficient of approximately +0.04 %/°C (≈ +4.8 mV/°C) in the 12 V range, per Figure 2 of REJ03G0182-0300 Rev.3.00.

Designed for low-noise applications, the HZ12A1J-E achieves ~1/3–1/10 lower diode noise than standard HZ-series Zeners. It is rated for junction temperatures up to 175°C and storage from −55°C to +175°C, with maximum reverse leakage current ≤1 μA at V_R = 9.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	11.6–12.1 V at I_Z = 0.5 mA - defines stable regulation point for feedback or bias networks
Dynamic Resistance (r_d)	≤80 Ω at I_Z = 0.5 mA - ensures minimal output impedance and high regulation stiffness
Power Dissipation (P_d)	400 mW at T_a = 25°C - sets thermal derating limit for PCB layout and ambient conditions
Reverse Leakage Current (I_R)	≤1 μA at V_R = 9.5 V - critical for low-current bias stability and low-power standby operation
Junction Temperature (T_j)	−55°C to +175°C - supports operation in industrial and automotive under-hood environments
Noise Performance	~1/3–1/10 lower than HZ series - enables use in audio preamps, instrumentation amplifiers, and ADC references

Pinout & Package

Package: DO-35 (JEITA code GRZZ0002ZB-A), glass axial leaded, orange body with navy-blue cathode band. Mass: 0.13 g. Dimensions: φD = 2.0 mm, L = 26.0 mm, E = 4.2 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Zener breakdown terminal	Connected to regulated voltage node; polarity must be observed to avoid forward conduction
2 (Anode)	Reference ground return	Completes current path; tied to system ground or feedback node in shunt regulator topology

Key Features

Feature	Design Value
Low-noise Zener structure	Diode noise reduced to ~10–33% of legacy HZ series - directly improves SNR in precision analog stages
Stable low-impedance regulation	r_d ≤ 80 Ω at 0.5 mA - maintains tight voltage control under varying load or supply ripple
Wide operating temperature range	T_j = −55°C to +175°C - supports deployment in uncontrolled industrial enclosures and engine compartments
Controlled zener voltage tolerance	±0.5 V over 11.6–12.1 V range - enables predictable loop gain and error budgeting in closed-loop designs

Applications

High-Precision Reference Supply	Low-Noise Sensor Biasing
Use Scenario: Providing stable excitation voltage to bridge-based pressure or strain sensors in data acquisition modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed bias point for Wheatstone bridge operation. Use Value: Low dynamic resistance (≤80 Ω) and low noise suppress measurement drift and 1/f noise coupling into signal chain.	Use Scenario: Biasing photodiode or MEMS microphone preamplifier input stage in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA), low-noise voltage reference for analog front-end bias network. Use Value: Reduced diode noise preserves signal integrity in sub-mV-level sensor outputs; DO-35 package allows manual rework during prototyping.
Industrial Power Supply Feedback	Calibration-Grade Instrumentation
Use Scenario: Secondary-side voltage sensing in isolated DC-DC converters for factory automation controllers. IC Role / Device Role / Timing Role: Zener element in optocoupler feedback loop regulating output voltage accuracy. Use Value: Tight V_Z tolerance (±0.5 V) and stable temperature coefficient enable ±1% output regulation without trimming.	Use Scenario: Reference source in portable multimeters and handheld calibration tools requiring long-term stability. IC Role / Device Role / Timing Role: Primary voltage reference for ADC/DAC offset and gain calibration routines. Use Value: Low noise and low leakage minimize reference-induced errors in 16-bit+ measurement systems across temperature cycles.

High-Precision Reference Supply

Low-Noise Sensor Biasing

Use Scenario: Providing stable excitation voltage to bridge-based pressure or strain sensors in data acquisition modules.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed bias point for Wheatstone bridge operation.

Use Value: Low dynamic resistance (≤80 Ω) and low noise suppress measurement drift and 1/f noise coupling into signal chain.

Use Scenario: Biasing photodiode or MEMS microphone preamplifier input stage in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Low-leakage (≤1 μA), low-noise voltage reference for analog front-end bias network.

Use Value: Reduced diode noise preserves signal integrity in sub-mV-level sensor outputs; DO-35 package allows manual rework during prototyping.

Industrial Power Supply Feedback

Calibration-Grade Instrumentation

Use Scenario: Secondary-side voltage sensing in isolated DC-DC converters for factory automation controllers.

IC Role / Device Role / Timing Role: Zener element in optocoupler feedback loop regulating output voltage accuracy.

Use Value: Tight V_Z tolerance (±0.5 V) and stable temperature coefficient enable ±1% output regulation without trimming.

Use Scenario: Reference source in portable multimeters and handheld calibration tools requiring long-term stability.

IC Role / Device Role / Timing Role: Primary voltage reference for ADC/DAC offset and gain calibration routines.

Use Value: Low noise and low leakage minimize reference-induced errors in 16-bit+ measurement systems across temperature cycles.

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
1N4742A (ON Semiconductor)	V_Z = 12 V ±5%, r_d = 9 Ω typical (at 21 mA), P_d = 1 W, DO-41 package	Higher test current (21 mA vs. 0.5 mA) and wider tolerance reduce suitability for ultra-low-current biasing	Prefer when higher power handling and tighter nominal V_Z are prioritized over low-current noise performance
BZX85C12 (Nexperia)	V_Z = 12 V ±5%, r_d = 25 Ω typical (at 5 mA), P_d = 1.3 W, DO-41 package	Higher test current and less stringent noise specification limit use in sub-μA bias networks	Select for cost-sensitive industrial supplies where low-noise is secondary to robustness and availability

Compared with 1N4742A and BZX85C12, the HZ12A1J-E delivers superior low-current noise and tighter low-current V_Z spec at 0.5 mA, making it uniquely suited for precision analog biasing - though its 400 mW rating and DO-35 footprint require careful thermal and layout consideration.

Availability

HZ12A1J-E is available at Aetrix Electronics and suitable for industrial power supplies, precision sensor interfaces, and calibration-grade instrumentation requiring stable component supply with traceable sourcing and long-lifecycle support.

Supply support for HZ12A1J-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 HZ-L Series was developed by Renesas specifically for low-noise, high-stability voltage reference applications in analog signal chains and precision power management - distinguishing it from general-purpose Zener families.

FAQ

What is the zener voltage tolerance of HZ12A1J-E at 0.5 mA?

The HZ12A1J-E has a zener voltage range of 11.6 V to 12.1 V when tested at I_Z = 0.5 mA, corresponding to a ±0.5 V absolute tolerance. This tight window supports accurate voltage setting in low-current reference designs without external trimming, and is confirmed in the Electrical Characteristics table on page 3 of REJ03G0182-0300 Rev.3.00.

Does HZ12A1J-E meet RoHS requirements?

Yes, HZ12A1J-E complies with the EU RoHS Directive, as stated in Renesas' environmental compliance documentation and verified through material declarations. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is suitable for environmentally regulated industrial and consumer applications.

What is the maximum reverse leakage current for HZ12A1J-E?

The maximum reverse leakage current for HZ12A1J-E is 1 μA at V_R = 9.5 V, per the Electrical Characteristics table on page 3 of REJ03G0182-0300 Rev.3.00. This low leakage ensures minimal error contribution in high-impedance bias networks and extends battery life in always-on sensor nodes.

Can HZ12A1J-E replace standard HZ-series Zeners directly?

Yes, HZ12A1J-E is a drop-in replacement for HZ12A1L in the same DO-35 package with identical pinout and mechanical dimensions. It offers significantly lower noise (1/3–1/10 of HZ series) and identical electrical ratings - making it ideal for upgrading existing designs requiring improved analog performance without layout changes.

What is the temperature coefficient behavior of HZ12A1J-E?

HZ12A1J-E exhibits a positive temperature coefficient of approximately +0.04 %/°C (≈ +4.8 mV/°C) near 12 V, as shown in Figure 2 of REJ03G0182-0300 Rev.3.00. This predictable drift enables compensation in temperature-critical references and confirms its suitability for industrial-grade applications operating across −40°C to +125°C ambient ranges.

HZ12A1J-E Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 12 V

Tolerance:: ±5%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 8 Ohms

Current - Reverse Leakage @ Vr:: 10 µA @ 9 V

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

HZ12A1J-E FAQ

1.How can I place an order for HZ12A1J-E through Aetrix?

Please submit a Request for Quotation (RFQ) for HZ12A1J-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 HZ12A1J-E reliable?

The price and inventory of HZ12A1J-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ12A1J-E is usually 5 days.

3.What payment methods are accepted for HZ12A1J-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ12A1J-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HZ12A1J-E?

HZ12A1J-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HZ12A1J-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 HZ12A1J-E?

For technical support, including HZ12A1J-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ12A1J-E requirements.

6.How does Aetrix verify that HZ12A1J-E is sourced from the original manufacturer or authorized distributors?

All HZ12A1J-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 HZ12A1J-E meets industry standards.

7.What is the process for return or replacement of HZ12A1J-E?

All HZ12A1J-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ12A1J-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 HZ12A1J-E part is unused and in its original packaging.

Return procedure for HZ12A1J-E:

1.Submit a request within 90 days.

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

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