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Renesas HZ5A2-E
- Part No.:
- HZ5A2-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ5A2-E.pdf
- Description:
- DIODE ZENER 0.5W
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
HZ5A2-E from Renesas is a silicon planar Zener diode designed for voltage regulation in low-power stabilized DC power supplies, with a nominal zener voltage of 4.8–5.0 V, 500 mW power dissipation, and 1.5 Ω dynamic resistance at 5 mA test current.
For engineers reviewing the HZ5A2-E datasheet, HZ5A2-E pinout, HZ5A2-E application, or HZ5A2-E equivalent, this device serves as a precision shunt reference in linear regulators, overvoltage protection circuits, and low-current biasing networks where tight voltage tolerance and low impedance are required.
Technical Context
The HZ5A2-E operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified zener breakdown threshold. Its DO-35 glass package supports axial lead mounting and thermal dissipation up to 500 mW at 25°C ambient.
It exhibits a zener voltage temperature coefficient near zero (±0.02 %/°C typical for 5 V grade), enabling stable reference performance across industrial temperature ranges. Reverse leakage remains ≤5 µA at 0.5 V, ensuring minimal standby power loss in battery-sensitive designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.8–5.0 V at 5 mA - defines precise regulation point for 5 V rail stabilization |
| Power Dissipation (Pd) | 500 mW - sets maximum continuous power handling without derating below 25°C |
| Dynamic Resistance (rd) | 1.5 Ω max at 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | ≤5 µA at 0.5 V - guarantees low quiescent current in standby mode |
| Junction Temperature (Tj) | −55 to +175°C - supports operation in harsh environments including automotive under-hood |
| Package | DO-35 (GRZZ0002ZB-A) - standard axial glass package with cathode band marking |
Pinout & Package
DO-35 glass axial package with cathode band marking; total mass ≈0.13 g; body diameter 2.0 mm max, length 26.0 mm min.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Regulated Output Reference Node | Connected to positive supply rail; reverse-biased terminal where stable voltage appears |
| 2 (Anode) | Reference Ground / Return Path | Connected to circuit ground or lower-potential node; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low Dynamic Impedance | 1.5 Ω max enables <10 mV output shift per 15 mA load change at 5 V |
| Wide Zener Voltage Range Coverage | Part of HZ Series spanning 1.6–38 V, allowing single-source design flexibility across multiple rails |
| Stable Temperature Coefficient | Near-zero TC (±0.02 %/°C) minimizes drift in 5 V reference applications over −40 to +85°C |
| High Reliability Glass Package | DO-35 construction provides hermetic sealing and proven long-term stability in industrial environments |
Applications
| 5 V Microcontroller Power Rail Regulation | Overvoltage Clamp for Sensor Interface |
|---|---|
Use Scenario: Regulating unregulated 6–9 V input to clean 5 V supply for MCU I/O and analog peripherals in embedded control modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing passive regulation via series resistor and HZ5A2-E conduction. Use Value: Maintains ±2% output accuracy over temperature and line variations without active feedback components. | Use Scenario: Protecting 5 V ADC inputs from transient surges exceeding 5.5 V in industrial sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Fast-acting clamp limiting voltage excursion before damage occurs to downstream ICs. Use Value: Responds within nanoseconds to overvoltage events while dissipating <500 mW peak energy. |
| Bias Voltage Generator for Op-Amp Circuits | Reference Source for Low-Power Comparators |
Use Scenario: Generating stable mid-rail bias (2.5 V) using resistive divider + HZ5A2-E in rail-to-rail op-amp designs. IC Role / Device Role / Timing Role: Precision voltage sink stabilizing virtual ground node against supply ripple. Use Value: Delivers <1 mV ripple rejection at 100 kHz due to low rd and high PSRR inherent to Zener topology. | Use Scenario: Setting accurate trip point for battery-low detection in portable medical devices operating from 3.7 V Li-ion cells. IC Role / Device Role / Timing Role: Fixed reference input to comparator with known 4.9 V threshold (center of 4.8–5.0 V spec). Use Value: Enables ±1% voltage monitoring accuracy without trimming or calibration. |
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 |
|---|---|---|---|
| 1N4732A | 5.1 V nominal, 10% tolerance (4.85–5.36 V), 10 Ω rd, same DO-35 package | Higher dynamic impedance reduces regulation fidelity under varying loads | Select when wider voltage tolerance is acceptable and cost is prioritized over precision |
| BZX55-C5V1 | 5.1 V nominal, 5% tolerance (4.85–5.36 V), 60 Ω rd, DO-35 package | Higher rd and looser grading limit use in low-noise or high-stability references | Prefer for general-purpose clamping where regulation accuracy is secondary to availability |
Compared with 1N4732A and BZX55-C5V1, the HZ5A2-E delivers tighter zener voltage tolerance (4.8–5.0 V), lower dynamic resistance (1.5 Ω), and superior temperature stability-making it optimal for precision 5 V reference and low-drift biasing where regulation fidelity is critical.
Availability
HZ5A2-E is available at Aetrix Electronics and suitable for industrial control systems, sensor interface modules, and low-power embedded power management requiring stable component supply and long-lifecycle support.
Supply support for HZ5A2-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, and timing solutions for automotive, industrial, and IoT applications.
The HZ Series Zener diodes were developed specifically for high-reliability DC voltage stabilization in space-constrained, thermally demanding applications-emphasizing low leakage, tight grading, and robust DO-35 packaging.
FAQ
What is the exact zener voltage range specified for HZ5A2-E?
The HZ5A2-E has a guaranteed zener voltage range of 4.8 V to 5.0 V when tested at 5 mA reverse current and 25°C ambient temperature. This 200 mV span reflects Grade B2 tolerance within the HZ5 family and is confirmed in the Electrical Characteristics table on page 2 of REJ03G0180-0600 Rev.6.00. The HZ5A2-E is distinct from HZ5B2 (4.8–5.0 V) and HZ5C2 (5.0–5.2 V) variants.
Does HZ5A2-E support operation beyond 25°C ambient temperature?
Yes, the HZ5A2-E is rated for junction temperatures from −55°C to +175°C and storage temperatures from −55°C to +175°C. Its power dissipation derates linearly above 25°C per Figure 3 in the datasheet, maintaining safe operation up to +100°C ambient with appropriate PCB copper area or airflow. The HZ5A2-E's low temperature coefficient ensures minimal VZ drift across this full range.
What is the maximum reverse leakage current for HZ5A2-E at 0.5 V?
The maximum reverse leakage current for HZ5A2-E is 5 µA when measured at 0.5 V reverse voltage and 25°C, as specified in the Electrical Characteristics table. This low leakage supports energy-efficient designs, especially in battery-powered systems where standby current must remain below 10 µA. The HZ5A2-E achieves this while maintaining fast turn-on response during regulation.
Is HZ5A2-E compatible with automated PCB assembly processes?
Yes, the HZ5A2-E uses the standard DO-35 axial package (JEITA code GRZZ0002ZB-A) with 2.0 mm body diameter and 26 mm minimum length, compatible with wave soldering and selective soldering equipment. Its glass body withstands peak reflow temperatures up to 260°C for 10 seconds. The cathode band marking enables automated optical inspection (AOI) alignment verification during placement.
How does the dynamic resistance of HZ5A2-E compare to other 5 V Zener diodes?
The HZ5A2-E specifies a maximum dynamic resistance of 1.5 Ω at 5 mA, significantly lower than industry-standard alternatives like 1N4732A (10 Ω) or BZX55-C5V1 (60 Ω). This 6.7× lower rd translates directly to improved load regulation-less than 15 mV output shift for a 10 mA load step-making the HZ5A2-E suitable for precision analog references where stability is critical.
HZ5A2-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:
- -
HZ5A2-E FAQ
1.How can I place an order for HZ5A2-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ5A2-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 HZ5A2-E reliable?
The price and inventory of HZ5A2-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ5A2-E is usually 5 days.
3.What payment methods are accepted for HZ5A2-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ5A2-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ5A2-E?
HZ5A2-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ5A2-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 HZ5A2-E?
For technical support, including HZ5A2-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ5A2-E requirements.
6.How does Aetrix verify that HZ5A2-E is sourced from the original manufacturer or authorized distributors?
All HZ5A2-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 HZ5A2-E meets industry standards.
7.What is the process for return or replacement of HZ5A2-E?
All HZ5A2-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ5A2-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 HZ5A2-E part is unused and in its original packaging.
Return procedure for HZ5A2-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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