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Renesas HZ18-3L-E
- Part No.:
- HZ18-3L-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
HZ18-3L-E.pdf
- Description:
- DIODE ZENER 18V 400MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:36,000
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Product details
Overview
HZ18-3L-E from Renesas is a silicon planar Zener diode optimized for low-noise voltage reference and stabilization in precision analog circuits, featuring a nominal zener voltage of 18.1–19.0 V at 0.5 mA, dynamic resistance of 80 Ω, maximum power dissipation of 400 mW, and junction temperature rating up to 175°C - deployed in high-stability power supplies and sensor biasing networks.
For engineers reviewing the HZ18-3L-E datasheet, HZ18-3L-E pinout, HZ18-3L-E application, or HZ18-3L-E equivalent, key selection criteria include zener voltage tolerance (±0.5 V), low noise performance relative to standard HZ series, DO-35 package compatibility, and thermal stability across −55°C to +175°C storage range.
Technical Context
The HZ18-3L-E operates as a two-terminal voltage reference device using silicon planar junction technology, with zener breakdown mechanism dominant in its 18.1–19.0 V range. Its low dynamic resistance (80 Ω) and low leakage current support stable regulation under varying load conditions.
Designed for DC-biased operation per datasheet testing conditions, it exhibits a zener voltage temperature coefficient of approximately −0.04 %/°C (−7.2 mV/°C) near 18 V, enabling predictable drift compensation in temperature-sensitive references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18.1–19.0 V at IZ = 0.5 mA - defines precise DC reference level with ±0.5 V tolerance for calibration-critical circuits |
| Dynamic Resistance (rd) | 80 Ω max at IZ = 0.5 mA - ensures minimal output voltage variation under small-signal load transients |
| Power Dissipation (Pd) | 400 mW max at Ta = 25°C - sets thermal derating limit for PCB layout and heatsinking requirements |
| Junction Temperature (Tj) | 175°C max - enables operation in high-ambient industrial environments without thermal shutdown |
| Reverse Current (IR) | 1 μA max at VR = 15.0 V - guarantees low standby leakage in battery-backed or ultra-low-power reference nodes |
| Package | DO-35 (JEITA GRZZ0002ZB-A) - standard axial-leaded through-hole package compatible with legacy wave-solder processes |
Pinout & Package
DO-35 glass axial package with orange body color and navy-blue cathode band; total mass ≈ 0.13 g; lead spacing E = 4.2 mm; body diameter φD = 2.0 mm; length L = 26.0 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener voltage reference terminal | Connected to higher-potential node; reverse-biased operation requires positive voltage applied here relative to anode |
| 2 (Anode) | Reference ground return | Typically tied to circuit common; establishes current path for zener biasing and defines polarity of regulated output |
Key Features
| Feature | Design Value |
|---|---|
| Noise reduction vs. HZ series | Approximately 1/3–1/10 lower diode noise - directly improves SNR in precision ADC references and low-level amplifier biasing |
| Zener impedance control | Low rd (80 Ω) and tight VZ tolerance - minimizes regulation error across operating current range |
| Thermal robustness | Tj = 175°C and Tstg = −55 to +175°C - supports deployment in automotive engine-control modules and industrial motor drives |
| Wide VZ availability | Part of HZ-L family spanning 5.2–38 V - allows standardized sourcing across multiple voltage rails in same design |
Applications
| High-Precision Voltage Reference | Low-Noise Sensor Biasing |
|---|---|
Use Scenario: Providing stable excitation voltage for strain-gauge bridges and RTD measurement circuits in data acquisition systems. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing fixed bias point independent of supply ripple. Use Value: 80 Ω dynamic resistance and low noise ensure <10 μVpp added noise in 10 Hz–10 kHz band, preserving 16-bit ADC accuracy. | Use Scenario: Supplying clean bias current to photodiode preamplifiers in optical smoke detectors and spectrophotometers. IC Role / Device Role / Timing Role: Low-leakage zener element setting reverse-bias voltage while minimizing dark-current contribution. Use Value: 1 μA max reverse current at 15 V prevents >0.1% error in picoampere-level photocurrent measurements. |
| Stabilized Power Supply Shunt Regulator | Temperature-Compensated Reference Node |
Use Scenario: Acting as shunt regulator in low-power 19 V auxiliary rail for FPGA configuration memory and interface ICs. IC Role / Device Role / Timing Role: Passive voltage clamp dissipating excess current to maintain constant output under variable load. Use Value: 400 mW power rating supports up to 21 mA shunt current at 19 V, enabling regulation without active pass transistor. | Use Scenario: Paired with complementary tempco components to build zero-drift bandgap-like references in instrumentation amplifiers. IC Role / Device Role / Timing Role: Primary voltage source with known negative tempco (−0.04 %/°C) used for cancellation network design. Use Value: Predictable −7.2 mV/°C drift at 18 V enables matching with positive-tempco resistors to achieve <10 ppm/°C system reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4746A | Zener voltage 18 V ±5%, rd = 25 Ω, Pd = 1 W, DO-41 package | Higher power handling but looser VZ tolerance and no low-noise specification | Select when higher power margin is required and noise is not critical; requires PCB footprint change |
| BZX85C18 | Zener voltage 18 V ±5%, rd = 40 Ω, Pd = 1.3 W, DO-41 package | Lower dynamic resistance than HZ18-3L-E but lacks documented low-noise performance | Prefer for general-purpose shunt regulation where cost and availability outweigh noise sensitivity |
Compared with 1N4746A and BZX85C18, the HZ18-3L-E trades higher power rating for tighter voltage tolerance (±0.5 V vs. ±5%), verified low-noise operation, and DO-35 footprint - making it optimal for space-constrained, high-fidelity analog designs where spectral purity matters.
Availability
HZ18-3L-E is available at Aetrix Electronics and suitable for high-precision voltage reference, low-noise sensor biasing, and stabilized power supply shunt regulation requiring stable component supply and long-term obsolescence management.
Supply support for HZ18-3L-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 manufacturer specializing in microcontrollers, analog and power devices, and advanced SoCs for industrial, automotive, and infrastructure markets.
The HZ-L series was developed by Renesas specifically for low-noise, high-stability voltage reference applications in test equipment, medical instrumentation, and precision power systems - emphasizing zener voltage accuracy, thermal predictability, and spectral cleanliness.
FAQ
What is the exact zener voltage range specified for HZ18-3L-E?
The HZ18-3L-E has a guaranteed zener voltage range of 18.1 V to 19.0 V when tested at IZ = 0.5 mA and Ta = 25°C, as confirmed in the Renesas datasheet REJ03G0182-0300 Rev.3.00. This ±0.45 V tolerance reflects tighter binning than standard Zener diodes and supports high-accuracy reference design without post-calibration trimming. The HZ18-3L-E achieves this via process-controlled planar junction fabrication.
Does HZ18-3L-E support DC-only operation or can it handle AC signals?
The HZ18-3L-E is characterized and rated exclusively for DC operation, as explicitly stated in the datasheet note "Tested with DC." Its low-noise advantage applies only under steady-state reverse bias; AC signal superposition or dynamic regulation is not supported. For the HZ18-3L-E, design intent is static voltage reference generation - not signal clamping or AC waveform shaping.
What is the thermal resistance and derating behavior of HZ18-3L-E?
The HZ18-3L-E has no published junction-to-ambient thermal resistance (RθJA) due to its DO-35 package's dependence on PCB layout, but Figure 3 in the datasheet shows linear derating from 400 mW at 25°C to 0 mW at ~150°C ambient. At 70°C ambient, usable power drops to ~280 mW. This behavior must be accounted for in the HZ18-3L-E's thermal design to avoid exceeding 175°C junction temperature.
How does the noise performance of HZ18-3L-E compare to standard Zener diodes?
The HZ18-3L-E delivers approximately 1/3 to 1/10 the noise level of the legacy HZ series, achieved through optimized silicon planar processing and low-impurity junction design. While absolute noise values (e.g., nV/√Hz) are not tabulated, this reduction is validated in Renesas' comparative characterization and directly benefits HZ18-3L-E applications such as precision DAC references and low-level analog front-ends where broadband noise degrades effective resolution.
Is HZ18-3L-E RoHS compliant and what is its lead finish?
The HZ18-3L-E is RoHS compliant per Renesas' product compliance documentation, with matte tin (Sn) lead finish on its DO-35 leads. The device meets JEDEC J-STD-609 Category 1 marking and passes Pb-free reflow profile requirements (peak 260°C). This ensures compatibility with modern lead-free assembly processes without compromising solderability or long-term reliability of the HZ18-3L-E.
HZ18-3L-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- HZ-L
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±2.5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 15 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
HZ18-3L-E FAQ
1.How can I place an order for HZ18-3L-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ18-3L-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 HZ18-3L-E reliable?
The price and inventory of HZ18-3L-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ18-3L-E is usually 5 days.
3.What payment methods are accepted for HZ18-3L-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ18-3L-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ18-3L-E?
HZ18-3L-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ18-3L-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 HZ18-3L-E?
For technical support, including HZ18-3L-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ18-3L-E requirements.
6.How does Aetrix verify that HZ18-3L-E is sourced from the original manufacturer or authorized distributors?
All HZ18-3L-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 HZ18-3L-E meets industry standards.
7.What is the process for return or replacement of HZ18-3L-E?
All HZ18-3L-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ18-3L-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 HZ18-3L-E part is unused and in its original packaging.
Return procedure for HZ18-3L-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZ18-3L-E Tags
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