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Renesas HZ18-1-91
- Part No.:
- HZ18-1-91
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ18-1-91.pdf
- Description:
- DIODE ZENER
- Quantity:
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Inventory:53,000
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Product details
Overview
HZ18-1L from Renesas is a silicon planar Zener diode engineered for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 16.9–17.7 V at 0.5 mA test current, 400 mW power dissipation, and dynamic resistance of 15.0 Ω - optimized for stabilized power supplies and reference applications.
For engineers reviewing the HZ18-1L datasheet, HZ18-1L pinout, HZ18-1L application, or HZ18-1L equivalent, key selection criteria include zener voltage tolerance (±0.4 V), low noise performance (1/3–1/10 of standard HZ series), temperature coefficient (−0.04 %/°C typical), and DO-35 package compatibility with through-hole PCB layouts.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage under varying load and input conditions via controlled reverse-bias breakdown. Its low dynamic impedance (15.0 Ω) ensures minimal output voltage variation with current changes, while its −0.04 %/°C temperature coefficient enables predictable drift behavior across −55°C to +175°C ambient range.
The HZ18-1L uses a silicon planar construction with navy-blue cathode band marking and orange body color, conforming to JEITA package code GRZZ0002ZB-A (DO-35). It is rated for 400 mW DC power dissipation and exhibits reverse leakage ≤1 μA at VR = 15.0 V, supporting low-power biasing and sensing roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.9–17.7 V at IZ = 0.5 mA - defines precise regulation point for mid-range voltage references |
| Power Dissipation (Pd) | 400 mW - supports continuous operation in compact through-hole designs without forced cooling |
| Dynamic Resistance (rd) | 15.0 Ω - ensures <15 mV output shift per 1 mA load change, critical for high-stability references |
| Reverse Leakage (IR) | ≤1 μA at VR = 15.0 V - minimizes quiescent current loss in battery-powered or ultra-low-power circuits |
| Temperature Coefficient (γZ) | −0.04 %/°C - enables predictable, low-drift behavior over industrial temperature range |
| Junction Temperature (Tj) | 175°C - allows reliable operation in thermally constrained enclosures or high-ambient environments |
Pinout & Package
Package: DO-35 glass axial lead package (JEITA code GRZZ0002ZB-A), 2.0 mm diameter × 26.0 mm length, orange body with navy-blue cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Regulated Output Terminal | Connected to positive rail; voltage referenced to anode; marked by navy-blue band |
| 2 (Anode) | Reference Ground Terminal | Typically tied to circuit common; establishes zener breakdown path when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise Zener operation | Noise level ~1/3–1/10 that of standard HZ series - essential for audio preamps and sensor signal conditioning |
| Stable voltage regulation | ±0.4 V tolerance at 0.5 mA - enables accurate calibration without post-trim adjustment |
| High thermal robustness | 175°C max junction temperature - supports use in automotive under-hood or industrial control environments |
| Low-leakage performance | ≤1 μA reverse current at 15 V - preserves battery life and avoids loading of high-impedance sources |
Applications
| Audio Signal Reference | Precision ADC Reference |
|---|---|
Use Scenario: Providing clean, low-drift bias voltage for microphone preamplifier stages in professional audio equipment. IC Role / Device Role / Timing Role: Shunt voltage reference stabilizing op-amp supply rails and setting DC operating points. Use Value: 15 Ω dynamic resistance and ultra-low noise suppress audible hiss and preserve SNR >110 dB. | Use Scenario: Serving as a stable reference source for 16-bit SAR ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Two-terminal voltage reference establishing exact full-scale input threshold. Use Value: ±0.4 V zener tolerance and −0.04 %/°C TC ensure <0.025% reference error over 0–70°C. |
| Industrial Power Monitor | Programmable Logic Controller Input |
Use Scenario: Regulating auxiliary supply for isolated current-sense amplifier in motor drive feedback loops. IC Role / Device Role / Timing Role: Low-power shunt regulator powering isolated analog front-end circuitry. Use Value: 400 mW rating and 1 μA leakage enable self-powered operation from 24 V bus with no external LDO. | Use Scenario: Conditioning 24 V digital input signals into safe logic-level thresholds for PLC microcontrollers. IC Role / Device Role / Timing Role: Overvoltage clamp and level translator protecting GPIO pins. Use Value: Fast response to transients and stable 17.3 V nominal clamping reduce false triggering in noisy factory environments. |
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 | Zener voltage 18 V ±5%, rd = 20 Ω, Pd = 1 W, DO-41 package | Higher power but larger footprint and looser tolerance; higher noise than HZ18-1L | Select when higher power handling is required and board space permits larger DO-41 layout |
| BZX84-C18 | Zener voltage 18 V ±5%, rd = 40 Ω, Pd = 300 mW, SOT-23 package | SMT-only, higher impedance, lower power; not suitable for low-noise analog references | Choose only for space-constrained digital clamp applications where noise and precision are secondary |
Compared with 1N4746A and BZX84-C18, the HZ18-1L delivers tighter voltage tolerance (±0.4 V vs. ±5%), lower dynamic impedance (15 Ω vs. 20–40 Ω), and significantly reduced noise - making it uniquely suited for precision analog reference duties rather than general-purpose clamping.
Availability
HZ18-1L is available at Aetrix Electronics and suitable for stabilized power supplies, precision analog references, industrial sensor interfaces, and low-noise audio circuits requiring stable component supply with consistent parametric performance across production lots.
Supply support for HZ18-1L 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 specializing in microcontrollers, analog power devices, and timing solutions, with deep expertise in industrial, automotive, and infrastructure applications.
The HZ-L Series was designed specifically for low-noise, high-stability voltage reference applications in precision analog systems - emphasizing zener voltage accuracy, thermal stability, and noise reduction over generic regulation.
FAQ
What is the nominal zener voltage range of the HZ18-1L?
The HZ18-1L has a specified zener voltage range of 16.9 V to 17.7 V when tested at IZ = 0.5 mA and Ta = 25°C. This tight 0.8 V span reflects its precision-grade regulation capability and distinguishes it from general-purpose Zener diodes with wider tolerances. The HZ18-1L achieves this consistency through Renesas' silicon planar process and low-noise design.
Is the HZ18-1L compatible with standard DO-35 footprints?
Yes, the HZ18-1L uses the industry-standard DO-35 glass axial package (JEITA code GRZZ0002ZB-A), with 2.0 mm body diameter and 26.0 mm overall length. Its lead spacing and dimensions match legacy DO-35 layouts, enabling drop-in replacement in existing through-hole designs without PCB modification. The HZ18-1L retains the same mechanical form factor as other DO-35 Zeners while delivering superior electrical performance.
How does the noise performance of HZ18-1L compare to standard Zener diodes?
The HZ18-1L exhibits approximately 1/3 to 1/10 the noise level of conventional HZ-series Zeners due to its optimized silicon planar structure and low-noise processing. This makes the HZ18-1L especially valuable in audio preamplifiers, sensor signal chains, and precision references where broadband noise directly impacts system SNR. The HZ18-1L's low-noise advantage is explicitly documented in Renesas' REJ03G0182-0300 datasheet.
What is the maximum reverse leakage current for HZ18-1L at 15 V?
The HZ18-1L guarantees reverse leakage current ≤1 μA when subjected to VR = 15.0 V at Ta = 25°C. This ultra-low leakage supports high-impedance bias networks and extends battery life in portable instrumentation. The HZ18-1L's leakage specification is verified per the absolute maximum ratings table in its official Renesas datasheet (REJ03G0182-0300 Rev.3.00).
Can HZ18-1L be used in automotive under-hood applications?
The HZ18-1L supports junction temperatures up to 175°C and storage temperatures from −55°C to +175°C, meeting key thermal requirements for non-safety-critical automotive under-hood locations. However, Renesas does not qualify the HZ-L Series for automotive safety applications (e.g., airbag control or braking systems). For qualified alternatives, consult Renesas' AEC-Q101 product portfolio - the HZ18-1L remains appropriate for engine bay sensors and auxiliary power monitoring where full automotive qualification is not mandated.
HZ18-1-91 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:
- -
HZ18-1-91 FAQ
1.How can I place an order for HZ18-1-91 through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ18-1-91 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 HZ18-1-91 reliable?
The price and inventory of HZ18-1-91 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ18-1-91 is usually 5 days.
3.What payment methods are accepted for HZ18-1-91?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ18-1-91 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ18-1-91?
HZ18-1-91 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ18-1-91 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 HZ18-1-91?
For technical support, including HZ18-1-91 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ18-1-91 requirements.
6.How does Aetrix verify that HZ18-1-91 is sourced from the original manufacturer or authorized distributors?
All HZ18-1-91 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 HZ18-1-91 meets industry standards.
7.What is the process for return or replacement of HZ18-1-91?
All HZ18-1-91 units undergo pre-shipment inspection (PSI). If there is an issue with HZ18-1-91, 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 HZ18-1-91 part is unused and in its original packaging.
Return procedure for HZ18-1-91:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZ18-1-91 Tags
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MM5Z5V1ST1G
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