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Renesas HZS18NB3TA-E
- Part No.:
- HZS18NB3TA-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZS18NB3TA-E.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
HZS18NB3TA-E from Renesas Electronics is a silicon planar Zener diode designed for precision voltage regulation in stabilized power supplies. It delivers a nominal zener voltage of 17.51–18.30 V at 5 mA test current, with dynamic resistance of 13 Ω, maximum power dissipation of 400 mW, and junction temperature rating up to 200°C - enabling use in compact industrial power rails and reference circuits.
For engineers reviewing the HZS18NB3TA-E datasheet, HZS18NB3TA-E pinout, HZS18NB3TA-E application, or HZS18NB3TA-E equivalent, this page provides verified electrical parameters, package dimensions, thermal derating behavior, real-world stabilization use cases, and validated alternative parts for supply continuity and design flexibility.
Technical Context
The HZS18NB3TA-E operates as a two-terminal voltage reference device using silicon planar junction technology. Its zener breakdown mechanism provides stable reverse-biased regulation with low leakage (≤0.2 μA at VR = 14 V) and tightly controlled voltage tolerance across Grade B3 (±3.0% typical VZ spread).
Thermal performance is defined by a zener voltage temperature coefficient of approximately +0.06 %/°C near 18 V, and power dissipation derates linearly above 25°C ambient - dropping to ~250 mW at 70°C on a standard 100 × 180 × 1.6 mm phenolic PCB per Figure 3 in the official datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.51–18.30 V at IZ = 5 mA - defines precise regulation point for 18 V rail stabilization |
| Dynamic Resistance (rd) | 13 Ω max at IZ = 5 mA - ensures minimal output voltage shift under load transients |
| Power Dissipation (Pd) | 400 mW max at Ta = 25°C - supports compact board layout without forced cooling |
| Reverse Leakage (IR) | ≤0.2 μA at VR = 14 V - enables low-quiescent-current bias networks |
| Junction Temperature (Tj) | 200°C max - allows operation in high-ambient industrial environments with margin |
| Package Type | MHD (JEITA GRZZ0002ZC-A) - 5 mm pitch, axial-leaded, 2.0 mm diameter body for high-speed insertion |
| Storage Temp Range | –55 to +175°C - compatible with reflow/reflow-compatible assembly and extended storage |
Pinout & Package
MHD package: axial-leaded, cylindrical glass-body diode with cathode band marking. Leads are tinned copper, 26.0 mm minimum length, 0.4 mm diameter. Mass: 0.084 g typical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode Band) | Cathode | Connected to regulated positive rail; polarity must be observed to avoid forward conduction |
| 2 (Anode) | Anode | Connected to ground or lower-potential node; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low zener impedance | 13 Ω dynamic resistance enables <10 mV output shift under ±1 mA load change |
| Grade B3 voltage tolerance | ±3.0% VZ spread ensures predictable regulation without post-production trimming |
| 400 mW power rating | Supports 18 V @ 22 mA continuous dissipation on standard FR-1/phenolic PCB |
| High junction temperature rating | 200°C Tj allows operation in sealed enclosures up to 125°C ambient with thermal margin |
| 5 mm pitch compatibility | Enables automated placement in legacy through-hole manufacturing lines |
Applications
| Industrial Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Providing stable 18 V reference for feedback loop in isolated DC-DC converters used in PLC power modules. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference for TL431-based error amplifier input. Use Value: Tight 13 Ω rd minimizes feedback error under line/load transients, improving output regulation to ±1.5%. |
Use Scenario: Clamping transient spikes on 24 V industrial sensor bus lines exposed to inductive switching noise. IC Role / Device Role / Timing Role: Two-terminal overvoltage clamp placed between bus and ground to limit excursion to ≤18.3 V. Use Value: 0.2 μA leakage at 14 V prevents false triggering while 400 mW rating absorbs 100 ms surges up to 1.2 A. |
| Temperature-Stable Bias Network | Low-Power Microcontroller Reset Circuit |
|
Use Scenario: Generating temperature-compensated bias voltage for op-amp input stages in analog front-ends operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Zener diode combined with NTC thermistor to offset tempco drift in precision references. Use Value: +0.06 %/°C γZ enables predictable compensation slope matching common NTC curves. |
Use Scenario: Holding microcontroller reset pin low until 18 V rail stabilizes during cold start in battery-backed metering devices. IC Role / Device Role / Timing Role: Shunt regulator holding RC network voltage below logic threshold until VCC ≥17.5 V. Use Value: B3-grade VZ tolerance guarantees reset release within 100 ms of power-on, meeting ISO 16750-2 Class IV requirements. |
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 |
|---|---|---|---|
| 1N4746A | 18 V nominal, ±5% tolerance, 1.0 W rating, DO-41 package (larger than MHD), rd = 14 Ω | Higher power handling but larger footprint; less suitable for space-constrained 5 mm pitch assembly | Choose when >400 mW surge capability is required and board area permits DO-41 |
| BZX84-C18 | 18 V nominal, ±5% tolerance, SOT-23 package, Pd = 350 mW, rd = 25 Ω | SMT-only; higher impedance limits regulation accuracy in precision feedback paths | Choose for automated surface-mount production where board density outweighs regulation tightness |
Compared with HZS18NB3TA-E, the 1N4746A offers higher power margin but requires PCB real estate and manual handling trade-offs, while the BZX84-C18 enables miniaturization at the cost of dynamic resistance and voltage tolerance - making HZS18NB3TA-E optimal for through-hole, high-stability, medium-power industrial references.
Availability
HZS18NB3TA-E is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface protection circuits, and microcontroller reset networks requiring stable component supply with consistent Grade B3 voltage tolerance and MHD package compatibility.
Supply support for HZS18NB3TA-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 HZS-N Series was developed specifically for high-reliability, low-drift voltage stabilization in industrial power conversion and protection systems - emphasizing tight tolerance, thermal stability, and manufacturability in legacy through-hole assembly lines.
FAQ
What is the exact zener voltage range for HZS18NB3TA-E?
The HZS18NB3TA-E has a guaranteed zener voltage range of 17.51 V to 18.30 V when tested at IZ = 5 mA and Ta = 25°C. This Grade B3 specification reflects ±3.0% tolerance around the nominal 18 V rating, confirmed in Renesas datasheet REJ03G0185-0300 Rev.3.00.
Is HZS18NB3TA-E RoHS compliant?
Yes, HZS18NB3TA-E complies with the EU RoHS Directive. Renesas confirms environmental compliance for the HZS-N Series in accordance with applicable regulations, including lead-free termination and restricted substance controls - verified via material declarations and manufacturing process audits.
What is the maximum allowable reverse current before regulation in HZS18NB3TA-E?
The HZS18NB3TA-E exhibits ≤0.2 μA reverse leakage current at VR = 14 V (80% of nominal VZ). This ultra-low IR ensures minimal parasitic loading in high-impedance bias networks and preserves accuracy in precision reference designs using the HZS18NB3TA-E.
Can HZS18NB3TA-E be used in surface-mount designs?
No - HZS18NB3TA-E uses the axial-leaded MHD package (JEITA GRZZ0002ZC-A) designed for through-hole mounting. It is not compatible with reflow soldering or pick-and-place SMT processes. For SMT alternatives, consider the BZX84-C18 or similar SOT-23 Zeners, though they differ in regulation performance and thermal behavior from the HZS18NB3TA-E.
How does ambient temperature affect power dissipation in HZS18NB3TA-E?
Per Figure 3 in the Renesas datasheet, HZS18NB3TA-E's power dissipation derates linearly above 25°C: it drops to ~250 mW at 70°C ambient on a standard 100 × 180 × 1.6 mm phenolic PCB. This thermal profile must be accounted for in enclosed industrial enclosures where ambient may exceed 60°C - ensuring HZS18NB3TA-E remains within its 200°C junction limit.
HZS18NB3TA-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:
- -
HZS18NB3TA-E FAQ
1.How can I place an order for HZS18NB3TA-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZS18NB3TA-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 HZS18NB3TA-E reliable?
The price and inventory of HZS18NB3TA-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZS18NB3TA-E is usually 5 days.
3.What payment methods are accepted for HZS18NB3TA-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZS18NB3TA-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZS18NB3TA-E?
HZS18NB3TA-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZS18NB3TA-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 HZS18NB3TA-E?
For technical support, including HZS18NB3TA-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZS18NB3TA-E requirements.
6.How does Aetrix verify that HZS18NB3TA-E is sourced from the original manufacturer or authorized distributors?
All HZS18NB3TA-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 HZS18NB3TA-E meets industry standards.
7.What is the process for return or replacement of HZS18NB3TA-E?
All HZS18NB3TA-E units undergo pre-shipment inspection (PSI). If there is an issue with HZS18NB3TA-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 HZS18NB3TA-E part is unused and in its original packaging.
Return procedure for HZS18NB3TA-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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