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Renesas HZ4A2-E
- Part No.:
- HZ4A2-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ4A2-E.pdf
- Description:
- DIODE ZENER 0.5W
- Quantity:
- Payment:
- Shipping:
Inventory:8,300
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Product details
Overview
HZ4A2-E from Renesas is a silicon planar Zener diode designed for voltage regulation in low-power stabilized DC supplies, featuring a nominal zener voltage of 4.4 V (min 4.4 V, max 4.6 V), 500 mW power dissipation, and 1.0 Ω dynamic resistance at 5 mA test current.
For engineers reviewing the HZ4A2-E datasheet, HZ4A2-E pinout, HZ4A2-E application, or HZ4A2-E equivalent, this device supports precision reference design, overvoltage protection, and biasing in analog sensor interfaces, linear regulators, and microcontroller reset circuits where tight voltage tolerance and low impedance are required.
Technical Context
The HZ4A2-E operates as a two-terminal shunt regulator with cathode-anode polarity, optimized for DC stabilization under fixed reverse-bias conditions. Its zener breakdown mechanism delivers stable voltage reference with low leakage (<25 µA at 0.5 V) and minimal temperature drift across its operating range.
It is rated for junction temperatures up to 175°C and storage from −55°C to +175°C, enabling use in industrial ambient environments. The device exhibits a zener voltage temperature coefficient near zero in the 4–5 V range, supporting stable performance without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.4 V min / 4.6 V max at IZ = 5 mA - defines precise regulation window for 4.5 V ±0.1 V reference applications |
| Power Dissipation (Pd) | 500 mW at Ta = 25°C - sets maximum continuous DC power handling before thermal derating |
| Dynamic Resistance (rd) | 1.0 Ω max at IZ = 5 mA - ensures low output impedance for high line/load regulation stability |
| Reverse Current (IR) | 25 µA max at VR = 0.5 V - guarantees low standby leakage in battery-backed or low-quiescent circuits |
| Junction Temperature (Tj) | 175°C max - supports operation in enclosed or high-ambient industrial enclosures without forced cooling |
| Package | DO-35 (JEITA GRZZ0002ZB-A) - standard axial-leaded through-hole package compatible with legacy PCB layouts and wave soldering |
Pinout & Package
DO-35 glass axial package with navy blue cathode band; total mass ≈ 0.13 g; body diameter φD = 2.0 mm (nom), length L = 26.0 mm (min), lead spacing E = 4.2 mm (nom).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (banded end) | Cathode | Connected to regulated voltage rail; reverse-biased terminal where zener breakdown occurs |
| 2 (non-banded end) | Anode | Connected to circuit ground or lower potential node; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Low zener impedance | 1.0 Ω max enables <1 mV output shift per 1 mA load change in reference designs |
| Wide zener voltage spectrum | Part of HZ Series covering 1.6–38 V - allows single-source family selection across multiple voltage rails |
| Stable temperature coefficient | Near-zero mV/°C drift in 4–5 V range minimizes calibration drift in unheated industrial sensors |
| High reliability DO-35 construction | Hermetically sealed glass package ensures long-term parameter stability and moisture resistance |
Applications
| Microcontroller Reset Circuit | Linear Regulator Reference |
|---|---|
Use Scenario: Generating a clean, noise-immune reset signal for 3.3 V or 5 V MCUs during power-up and brownout events. IC Role / Device Role / Timing Role: Shunt voltage clamp that holds reset line low until supply exceeds 4.5 V threshold. Use Value: Tight 4.4–4.6 V tolerance ensures deterministic reset assertion timing without external resistors or hysteresis components. | Use Scenario: Providing stable reference input to adjustable LDOs (e.g., LM317) or op-amp-based regulators. IC Role / Device Role / Timing Role: Precision voltage reference source replacing higher-cost bandgap ICs in cost-sensitive analog power stages. Use Value: 1.0 Ω dynamic resistance maintains reference accuracy under varying load currents up to 5 mA. |
| Overvoltage Protection Clamp | Analog Sensor Biasing |
Use Scenario: Protecting ADC inputs or op-amp rails from transient overvoltage spikes in industrial signal conditioning modules. IC Role / Device Role / Timing Role: Fast-acting shunt limiter clamping voltage to ≤4.6 V before damage thresholds are reached. Use Value: Low 25 µA leakage at 0.5 V prevents loading of high-impedance sensor outputs during normal operation. | Use Scenario: Supplying stable excitation voltage to resistive bridge sensors (e.g., strain gauges, RTDs) in measurement front-ends. IC Role / Device Role / Timing Role: Low-noise, low-drift DC bias source ensuring consistent sensor sensitivity and offset stability. Use Value: Near-zero temperature coefficient in 4.4–4.6 V range eliminates need for external compensation in 0–70°C operating zones. |
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 (ON Semiconductor) | Zener voltage 5.1 V ±5%, Pd = 1 W, DO-41 package, rd = 9 Ω | Higher power and voltage; less precise regulation at 4.5 V target | Select when 5.1 V reference or >500 mW headroom is required; not suitable for direct 4.5 V replacement |
| BZX55-C4V3 (Vishay) | Zener voltage 4.3 V ±5%, Pd = 500 mW, DO-35, rd = 25 Ω | Wider voltage tolerance (±5% vs. ±0.1 V), higher impedance degrades regulation accuracy | Acceptable for non-critical biasing where ±0.2 V tolerance is sufficient; avoid in precision reset or reference paths |
Compared with 1N4733A and BZX55-C4V3, the HZ4A2-E delivers tighter voltage tolerance (±0.1 V), lower dynamic resistance (1.0 Ω), and optimized temperature stability specifically for 4.5 V reference use - making it superior for MCU reset and analog sensor bias where regulation fidelity directly impacts system accuracy.
Availability
HZ4A2-E is available at Aetrix Electronics and suitable for microcontroller reset circuits, linear regulator references, and analog sensor biasing requiring stable component supply, long-lifecycle support, and traceable sourcing for industrial control and embedded instrumentation programs.
Supply support for HZ4A2-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 leader delivering microcontrollers, analog power devices, and timing solutions for automotive, industrial, and IoT systems.
The HZ Series Zener diodes were engineered for high-reliability DC voltage stabilization in space-constrained industrial power supplies and sensor interfaces - emphasizing low leakage, tight voltage tolerance, and robust thermal performance in legacy-compatible packages.
FAQ
What is the exact zener voltage range specified for HZ4A2-E?
The HZ4A2-E has a guaranteed zener voltage range of 4.4 V minimum to 4.6 V maximum when tested at IZ = 5 mA and Ta = 25°C. This 0.2 V span reflects Grade A2 tolerance within the HZ4 family and enables precise 4.5 V reference design without trimming.
Is HZ4A2-E compatible with standard DO-35 footprint and soldering processes?
Yes, HZ4A2-E uses the JEITA-standard DO-35 package (Renesas code GRZZ0002ZB-A) with 2.0 mm body diameter and 4.2 mm lead spacing. It supports conventional wave soldering and hand-soldering with standard DO-35 land patterns and thermal profiles for glass-body diodes.
What is the maximum reverse leakage current for HZ4A2-E, and under what condition is it measured?
HZ4A2-E specifies a maximum reverse leakage current of 25 µA at VR = 0.5 V and Ta = 25°C. This low leakage ensures minimal loading of high-impedance nodes in reset circuits and sensor bias networks, preserving signal integrity in battery-powered or precision analog designs.
Does HZ4A2-E have a specified zener voltage temperature coefficient, and how does it affect performance?
Yes, the HZ4A2-E falls within the 4–5 V region where the HZ Series exhibits near-zero zener voltage temperature coefficient (γZ ≈ 0 mV/°C). This minimizes voltage drift over temperature, making HZ4A2-E especially suitable for unregulated environments where thermal compensation is impractical.
Can HZ4A2-E be used in place of other HZ4 variants like HZ4B2 or HZ4C3?
No - HZ4A2-E is not interchangeable with HZ4B2 (4.6–4.8 V) or HZ4C3 (4.2–4.4 V) due to distinct zener voltage ranges. Each grade is binned for specific tolerance bands; substituting grades risks incorrect regulation voltage and system malfunction. Always verify voltage grade suffix against schematic requirements.
HZ4A2-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:
- -
HZ4A2-E FAQ
1.How can I place an order for HZ4A2-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ4A2-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 HZ4A2-E reliable?
The price and inventory of HZ4A2-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ4A2-E is usually 5 days.
3.What payment methods are accepted for HZ4A2-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ4A2-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ4A2-E?
HZ4A2-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ4A2-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 HZ4A2-E?
For technical support, including HZ4A2-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ4A2-E requirements.
6.How does Aetrix verify that HZ4A2-E is sourced from the original manufacturer or authorized distributors?
All HZ4A2-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 HZ4A2-E meets industry standards.
7.What is the process for return or replacement of HZ4A2-E?
All HZ4A2-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ4A2-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 HZ4A2-E part is unused and in its original packaging.
Return procedure for HZ4A2-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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