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Renesas HZK18JTR
- Part No.:
- HZK18JTR
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZK18JTR.pdf
- Description:
- DIODE ZENER 0.5W
- Quantity:
- Payment:
- Shipping:
Inventory:207,500
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Product details
Overview
HZK18JTR from Renesas Electronics is a silicon epitaxial planar Zener diode designed for voltage regulation and stabilization in low-power supply circuits, with a nominal zener voltage of 18 V (16.9–19.0 V), dynamic resistance of 55 Ω at 5 mA, maximum power dissipation of 500 mW, and operating junction temperature up to 175°C. It is used in precision reference circuits, overvoltage protection, and feedback networks in DC-DC converters.
For engineers reviewing the HZK18JTR datasheet, HZK18JTR pinout, HZK18JTR application, or HZK18JTR equivalent, key selection criteria include its 18 V zener tolerance (±5.8%), low leakage current (<1 µA at VR = 13 V), LLD surface-mount package compatibility, thermal stability (temperature coefficient ~+0.06 %/°C), and suitability for high-density PCB layouts requiring stable low-current regulation.
Technical Context
The HZK18JTR operates as a two-terminal voltage reference device using controlled reverse-bias breakdown in a planar epitaxial structure. Its zener voltage is specified at 5 mA test current, with dynamic resistance measured under DC conditions and characterized across ambient temperatures from –55°C to +175°C.
It exhibits a positive temperature coefficient (~+0.06 %/°C) typical of mid-voltage Zener diodes (>10 V), enabling predictable drift behavior in temperature-sensitive references. The LLD package supports automated placement and provides thermal performance validated on standard 1.6 mm FR-4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.9–19.0 V at IZ = 5 mA - defines regulation range for stable 18 V reference under nominal bias. |
| Dynamic Resistance (rd) | 55 Ω max at IZ = 5 mA - determines output impedance and load regulation sensitivity. |
| Power Dissipation (Pd) | 500 mW max at Ta = 25°C - sets absolute thermal limit before derating begins. |
| Reverse Leakage Current (IR) | <1 µA at VR = 13 V - ensures minimal quiescent current in standby or high-impedance sensing paths. |
| Junction Temperature (Tj) | –55°C to +175°C - enables operation in industrial and automotive under-hood environments with appropriate PCB thermal design. |
| Temperature Coefficient (γZ) | +0.06 %/°C - quantifies voltage drift per degree Celsius, critical for precision analog references. |
Pinout & Package
Package: LLD (leadless, surface-mount, 2-pin, 1.4 mm diameter cylindrical body, 0.027 g mass). Compliant with JEITA/JEDEC unspecified but standardized for high-density SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-bias terminal | Connected to regulated output node; polarity marking (cathode band) must align with PCB silkscreen for correct orientation. |
| 2 (Anode) | Reference ground/reference return | Biased toward lower potential; forms current path through series resistor to unregulated input in shunt regulator topology. |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance | 55 Ω at 5 mA enables tight regulation under varying load currents in feedback loops. |
| Wide zener voltage spectrum | 18 V nominal point within 1.9–38 V family supports standardized BOM consolidation across multiple voltage rails. |
| LLD surface-mount package | Compact 1.4 mm diameter footprint allows placement in space-constrained areas without through-hole drilling. |
| High junction temperature rating | 175°C Tj max permits use in thermally demanding enclosures without forced cooling. |
| Stable DC characteristics | Tested with DC (not pulsed) - ensures predictable behavior in static reference and calibration applications. |
Applications
| Industrial Power Monitoring | Automotive Cabin Control Module |
|---|---|
Use Scenario: Monitoring 24 V battery rail in programmable logic controllers with ±1% accuracy requirement. IC Role / Device Role / Timing Role: Shunt voltage reference for ADC input scaling and overvoltage detection threshold. Use Value: 55 Ω rd minimizes measurement error from source impedance mismatch in resistive divider networks. |
Use Scenario: Providing stable 18 V reference for microcontroller reset circuitry in HVAC control units. IC Role / Device Role / Timing Role: Zener-based reset supervisor input conditioning under cold-crank (6 V) and load-dump (40 V) transients. Use Value: 175°C Tj rating ensures reliability during prolonged operation near engine compartment heat sources. |
| Medical Diagnostic Sensor Interface | Telecom Line Card Biasing |
Use Scenario: Generating precise bias voltage for photodiode transimpedance amplifiers in portable pulse oximeters. IC Role / Device Role / Timing Role: Low-noise DC reference for op-amp offset nulling and gain-setting networks. Use Value: <1 µA leakage at 13 V prevents signal degradation in high-impedance sensor front-ends. |
Use Scenario: Stabilizing bias for RF amplifier stages in DSL line interface cards operating from 48 V phantom supply. IC Role / Device Role / Timing Role: Secondary shunt regulator for local 18 V rail generation in isolated subsystems. Use Value: 500 mW Pd supports continuous operation at 10 mA without thermal shutdown in sealed modules. |
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 (ON Semiconductor) | 18 V nominal, ±5% tolerance, 50 Ω rd, DO-41 package (larger, through-hole). | Requires PCB redesign for through-hole mounting; higher thermal resistance than LLD. | Choose when legacy through-hole assembly or higher surge capability (1 W peak) is required. |
| BZX84-C18 (Diodes Inc.) | 18 V nominal, ±5% tolerance, 70 Ω rd, SOT-23 package (3-pin, anode/cathode/common variant). | SOT-23 offers smaller footprint than LLD but requires verification of pin compatibility and thermal pad layout. | Prefer for ultra-compact designs where SOT-23 reflow profile and board space are optimized over thermal margin. |
Compared with 1N4746A and BZX84-C18, the HZK18JTR delivers superior thermal performance in SMT layouts due to its LLD geometry and 175°C Tj, while maintaining tighter dynamic resistance consistency at 5 mA-critical for high-accuracy analog references without external trimming.
Availability
HZK18JTR is available at Aetrix Electronics and suitable for industrial power monitoring, automotive cabin control modules, medical diagnostic sensor interfaces, and telecom line card biasing requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for HZK18JTR 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 manufacturer headquartered in Tokyo, Japan, specializing in microcontrollers, analog and power devices, and system-on-chip solutions for industrial, automotive, and infrastructure markets.
The HZK Series was developed by Renesas Electronics as a family of silicon epitaxial planar Zener diodes targeting cost-effective, high-reliability voltage stabilization in space-constrained, high-density power supply designs.
FAQ
What is the zener voltage tolerance of HZK18JTR?
The HZK18JTR has a zener voltage range of 16.9 V to 19.0 V at 5 mA test current, corresponding to a ±5.8% tolerance around the nominal 18 V rating. This specification is guaranteed under DC test conditions at Ta = 25°C and is documented in the Renesas HZK Series datasheet Rev.3.00.
Does HZK18JTR support surface-mount assembly?
Yes, the HZK18JTR uses the LLD package-a leadless, cylindrical, surface-mount device with 1.4 mm diameter and defined cathode/anode polarity markings. It is qualified for standard reflow soldering profiles and designed for high-speed pick-and-place automation in high-density PCB manufacturing.
What is the maximum reverse leakage current for HZK18JTR?
The HZK18JTR specifies a maximum reverse leakage current of less than 1 µA when tested at VR = 13 V (85% of nominal VZ). This low leakage ensures minimal parasitic loading in high-impedance reference and sensing circuits, preserving accuracy in precision analog applications.
Can HZK18JTR be used in automotive under-hood environments?
Yes, the HZK18JTR supports junction temperatures up to +175°C and storage temperatures from –55°C to +175°C. When mounted on thermally adequate PCBs (e.g., 2 oz copper, thermal vias), it meets requirements for non-safety-critical automotive cabin and engine bay modules per Renesas "Standard" quality grade classification.
How does the temperature coefficient of HZK18JTR affect circuit performance?
The HZK18JTR exhibits a positive temperature coefficient of approximately +0.06 %/°C, meaning its zener voltage increases linearly with temperature. This behavior must be factored into reference stability budgets-especially in wide-temperature-range applications like industrial sensors-where drift compensation may be needed.
HZK18JTR 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:
- -
HZK18JTR FAQ
1.How can I place an order for HZK18JTR through Aetrix?
Please submit a Request for Quotation (RFQ) for HZK18JTR 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 HZK18JTR reliable?
The price and inventory of HZK18JTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZK18JTR is usually 5 days.
3.What payment methods are accepted for HZK18JTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZK18JTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZK18JTR?
HZK18JTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZK18JTR 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 HZK18JTR?
For technical support, including HZK18JTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZK18JTR requirements.
6.How does Aetrix verify that HZK18JTR is sourced from the original manufacturer or authorized distributors?
All HZK18JTR 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 HZK18JTR meets industry standards.
7.What is the process for return or replacement of HZK18JTR?
All HZK18JTR units undergo pre-shipment inspection (PSI). If there is an issue with HZK18JTR, 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 HZK18JTR part is unused and in its original packaging.
Return procedure for HZK18JTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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