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Renesas HZ20-1-E
- Part No.:
- HZ20-1-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ20-1-E.pdf
- Description:
- DIODE ZENER 0.5W
- Quantity:
- Payment:
- Shipping:
Inventory:40,894
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Product details
Overview
HZ20-1-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 20.2–21.1 V at 2 mA test current, 500 mW power dissipation, and 60 Ω dynamic resistance - deployed in industrial sensor biasing, reference voltage generation, and overvoltage clamp circuits.
For engineers reviewing the HZ20-1-E datasheet, HZ20-1-E pinout, HZ20-1-E application, or HZ20-1-E equivalent, key selection criteria include verified zener voltage tolerance (±0.9 V), thermal coefficient behavior near 20 V, DO-35 package compatibility with through-hole PCB layouts, and leakage performance under reverse bias below 1 µA.
Technical Context
The HZ20-1-E operates as a two-terminal shunt regulator, maintaining stable output voltage across variable load currents by conducting excess current to ground when input exceeds its breakdown threshold. Its silicon planar construction ensures repeatable breakdown characteristics and low noise.
It exhibits a positive temperature coefficient (~+15 mV/°C) in the 20 V range, requiring thermal derating above 25°C ambient per the Pd vs. Ta curve. Junction temperature must remain ≤175°C, with storage rated from −55°C to +175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.2–21.1 V at IZ = 2 mA - defines regulated output voltage window under nominal bias |
| Power Dissipation (Pd) | 500 mW at Ta = 25°C - sets maximum continuous DC power handling before thermal shutdown |
| Dynamic Resistance (rd) | 60 Ω at IZ = 2 mA - determines regulation stiffness and output voltage ripple suppression |
| Reverse Leakage (IR) | ≤1 µA at VR = 15 V - ensures minimal quiescent current in standby clamp configurations |
| Junction Temperature (Tj) | 175°C maximum - constrains PCB copper area and heatsinking requirements for reliability |
| Package | DO-35 glass axial - enables manual soldering, wave solder compatibility, and standard reel-and-tape handling |
Pinout & Package
DO-35 glass axial package with cathode band marking; total length 26.0 mm, body diameter 2.0 mm, lead diameter 0.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to higher potential node; conduction occurs when anode-to-cathode voltage exceeds VZ |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower potential; completes shunt path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low zener impedance | 60 Ω at 2 mA enables tight voltage regulation under dynamic load transients |
| Stable 20 V-class breakdown | 20.2–21.1 V tolerance supports ±2.5% reference accuracy in analog front-ends |
| High junction temperature rating | 175°C operation allows use in thermally constrained enclosures without forced cooling |
| Low leakage current | ≤1 µA at 15 V reverse bias minimizes error in high-impedance voltage divider networks |
Applications
| Industrial Sensor Biasing | Reference Voltage Generation |
|---|---|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in factory automation modules. IC Role / Device Role / Timing Role: Shunt voltage reference that maintains constant bias across varying supply rails and temperatures. Use Value: Enables <1% full-scale measurement error despite ±10% input rail variation and 0–70°C ambient drift. | Use Scenario: Generating a precise 20 V reference for 12-bit ADC calibration in programmable logic controllers. IC Role / Device Role / Timing Role: Passive voltage reference source feeding into op-amp buffer stages. Use Value: Delivers <0.5% initial accuracy and <50 ppm/°C thermal drift over operating range. |
| Overvoltage Clamp Protection | Low-Power Supply Regulation |
Use Scenario: Clamping transient surges on 24 V DC control lines in building management systems. IC Role / Device Role / Timing Role: Fast-acting crowbar element that diverts fault current before downstream ICs exceed absolute max ratings. Use Value: Responds within nanoseconds to >28 V spikes, limiting clamped voltage to ≤21.1 V with <500 mW peak dissipation. | Use Scenario: Regulating unregulated 28 V wall adapter output to 20 V for microcontroller peripherals. IC Role / Device Role / Timing Role: Series-pass shunt regulator with resistor current limiting. Use Value: Maintains ±3% output stability across 1–10 mA load range without active feedback components. |
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 |
|---|---|---|---|
| 1N4744A | 20 V nominal, ±5% tolerance (20–21 V), 1.0 W power rating, DO-41 package | Higher power handling but looser voltage tolerance; requires larger PCB footprint | Select when higher surge energy absorption is needed and tighter VZ tolerance is not critical |
| BZX55-C20 | 20 V nominal, ±5% tolerance, 500 mW rating, DO-35 package, 100 Ω rd | Same package but higher dynamic resistance reduces regulation precision under load variation | Select when cost sensitivity outweighs regulation stiffness requirements |
Compared with HZ20-1-E, the 1N4744A offers greater power margin but sacrifices voltage accuracy and board space efficiency, while the BZX55-C20 matches the DO-35 form factor yet delivers weaker regulation due to 67% higher dynamic resistance - making HZ20-1-E optimal for precision 20 V references where thermal and layout constraints apply.
Availability
HZ20-1-E is available at Aetrix Electronics and suitable for industrial sensor biasing, reference voltage generation, and overvoltage clamp protection requiring stable component supply, long-term lifecycle support, and traceable sourcing from original manufacturer stock.
Supply support for HZ20-1-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 engineered specifically for high-stability, low-noise voltage reference and clamp functions in resource-constrained industrial power systems.
FAQ
What is the exact zener voltage range specified for HZ20-1-E?
The HZ20-1-E has a guaranteed zener voltage range of 20.2 V to 21.1 V when tested at a zener current of 2 mA and ambient temperature of 25°C. This 0.9 V span reflects the device's Grade "-1" tolerance binning, ensuring predictable regulation performance in precision analog circuits without requiring post-manufacturing calibration.
Does HZ20-1-E support surface-mount assembly?
No, HZ20-1-E uses a DO-35 glass axial package with radial leads intended for through-hole mounting only. It is not compatible with reflow or wave soldering processes designed for SMD components. For surface-mount alternatives, consider Renesas' HZ20-1-E equivalents in SOD-123 or SOD-323 packages - though those are distinct part numbers with different mechanical and thermal profiles.
What is the maximum reverse leakage current for HZ20-1-E?
The maximum reverse leakage current for HZ20-1-E is 1 µA at a reverse voltage of 15 V and ambient temperature of 25°C. This low leakage ensures minimal parasitic current draw in high-impedance reference networks and preserves accuracy in battery-powered or ultra-low-power monitoring circuits where standby current budgets are sub-µA.
How does temperature affect the zener voltage of HZ20-1-E?
HZ20-1-E exhibits a positive temperature coefficient of approximately +15 mV/°C near its 20 V operating point, meaning its zener voltage increases linearly with junction temperature. This behavior is documented in Figure 2 of the datasheet and must be factored into designs operating across −40°C to +125°C ambient ranges to maintain system-level voltage accuracy within specification.
Can HZ20-1-E be used in parallel for higher current capability?
No, HZ20-1-E should not be operated in parallel without individual current-limiting resistors, due to manufacturing variations in zener voltage causing current hogging. Even devices from the same reel may differ by up to 0.9 V, leading to thermal runaway in one unit. For higher current regulation, use a single higher-power Zener or implement an active shunt regulator with HZ20-1-E as the voltage-sensing element.
HZ20-1-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:
- -
HZ20-1-E FAQ
1.How can I place an order for HZ20-1-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ20-1-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 HZ20-1-E reliable?
The price and inventory of HZ20-1-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ20-1-E is usually 5 days.
3.What payment methods are accepted for HZ20-1-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ20-1-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ20-1-E?
HZ20-1-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ20-1-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 HZ20-1-E?
For technical support, including HZ20-1-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ20-1-E requirements.
6.How does Aetrix verify that HZ20-1-E is sourced from the original manufacturer or authorized distributors?
All HZ20-1-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 HZ20-1-E meets industry standards.
7.What is the process for return or replacement of HZ20-1-E?
All HZ20-1-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ20-1-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 HZ20-1-E part is unused and in its original packaging.
Return procedure for HZ20-1-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZ20-1-E Tags
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