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Renesas HZK18LTL-S-E
- Part No.:
- HZK18LTL-S-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZK18LTL-S-E.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
HZK18LTL-S-E 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 16.9–19.0 V at 5 mA test current, 55 Ω dynamic resistance, 500 mW power dissipation, and LLD surface-mount package - used in precision reference and overvoltage protection applications in office equipment and industrial control systems.
For engineers reviewing the HZK18LTL-S-E datasheet, HZK18LTL-S-E pinout, HZK18LTL-S-E application, or HZK18LTL-S-E equivalent, key selection criteria include zener voltage tolerance (±1.1 V), temperature coefficient (≈+0.07 %/°C), low leakage (<1 µA at 13 V), junction temperature rating (175 °C), and compatibility with high-density PCB assembly using LLD footprint.
Technical Context
The HZK18LTL-S-E operates as a two-terminal voltage reference device relying on controlled reverse-biased avalanche breakdown. Its zener voltage is specified at 5 mA DC test current, with dynamic resistance measured under the same condition to ensure stable regulation under varying load currents.
It exhibits a positive temperature coefficient above ~5.6 V, confirmed at +0.07 %/°C for the 18 V variant, and is rated for operation from –55 °C to +175 °C storage and junction temperature, supporting use in thermally demanding environments without derating below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.9–19.0 V at IZ = 5 mA - defines stable regulation range for mid-range supply rail clamping or reference generation. |
| Dynamic Resistance (rd) | 55 Ω max at IZ = 5 mA - determines output impedance and load regulation sensitivity in feedback or shunt regulator designs. |
| Power Dissipation (Pd) | 500 mW at Ta = 25 °C - sets maximum continuous DC power handling on standard FR-4 PCB with defined thermal layout. |
| Reverse Leakage (IR) | <1 µA at VR = 13 V - ensures minimal quiescent current draw in standby or battery-backed circuits. |
| Junction Temperature (Tj) | 175 °C maximum - enables reliable operation in enclosed enclosures or near heat-generating components without forced cooling. |
| Package | LLD (leadless, 2-pin surface-mount) - supports automated placement and reflow soldering with 1.4 mm diameter circular footprint. |
Pinout & Package
LLD package: miniature leadless cylindrical surface-mount device with cathode band marking; total mass 0.027 g; dimensions φ1.4 ± 0.1 mm × 3.5 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | High-side terminal in reverse-bias configuration | Connected to regulated voltage node; polarity marking (band) must align with PCB silkscreen for correct orientation. |
| 2 (Anode) | Low-side terminal referenced to ground or return path | Typically tied to system ground or current-sense resistor; forms shunt path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Low zener impedance | 55 Ω max ensures tight voltage regulation under ±1 mA load variation in shunt reference applications. |
| Wide zener voltage spectrum | 18 V nominal point within 1.9–38 V family enables direct substitution across multiple supply rails without redesign. |
| LLD surface-mount package | Compact φ1.4 mm footprint supports >10,000 units per hour pick-and-place throughput and reduces board area by 60% vs. DO-35. |
| High junction temperature rating | 175 °C Tj allows uninterrupted operation in sealed industrial enclosures up to 125 °C ambient with standard PCB copper pour. |
Applications
| Industrial Power Monitoring | USB-C PD Reference Clamp |
|---|---|
Use Scenario: Monitoring 24 V DC bus in PLC I/O modules with analog front-end protection. IC Role / Device Role / Timing Role: Shunt voltage clamp limiting input to ADC driver stage during transients. Use Value: Prevents saturation of op-amp input stage while maintaining <1 µA leakage to preserve measurement accuracy. |
Use Scenario: Secondary-side overvoltage protection in USB-C power delivery adapters. IC Role / Device Role / Timing Role: Fast-acting zener clamp on CC line reference voltage during fault conditions. Use Value: Responds within nanoseconds to 20 V surges, holding voltage at ≤19.0 V without latch-up or thermal runaway. |
| Office Equipment Voltage Reference | Automotive Body Control Module (Non-Safety) |
Use Scenario: Stable 18 V reference for laser printer high-voltage bias generator feedback loop. IC Role / Device Role / Timing Role: Precision DC reference source for PWM duty-cycle adjustment. Use Value: Maintains ±1.1 V tolerance across –20 to +70 °C ambient, enabling consistent toner transfer voltage. |
Use Scenario: Regulated 18 V supply rail for LIN transceiver and sensor interface in door module. IC Role / Device Role / Timing Role: Local shunt regulator providing clean bias for analog sensor conditioning. Use Value: Delivers stable voltage despite battery ripple (12–16 V), with no external capacitors required due to low rd. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Same 18 V nominal, SOT-23 package, 400 mW Pd, 40 Ω rd, but higher leakage (≤5 µA at 14.4 V). | Higher board-level assembly cost due to larger footprint; better suited for low-current references than high-stability clamping. | Select when lower dynamic resistance is prioritized over leakage and thermal margin. |
| MMBZ5245B | 18 V nominal, SOT-23, 350 mW Pd, 23 Ω rd, but only rated to 150 °C Tj and ±5% VZ tolerance. | Limited thermal headroom in enclosed automotive modules; tighter rd benefits low-noise analog stages. | Choose for space-constrained designs where 23 Ω rd outweighs reduced power and temperature capability. |
Compared with BZX84-C18LT1G and MMBZ5245B, the HZK18LTL-S-E offers superior thermal robustness (175 °C Tj), lower leakage, and higher power handling (500 mW), making it preferred for industrial-grade shunt regulation where long-term stability under thermal stress is critical.
Availability
HZK18LTL-S-E is available at Aetrix Electronics and suitable for industrial power monitoring, USB-C PD reference clamp, and office equipment voltage reference applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for HZK18LTL-S-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 manufacturer specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and consumer markets.
The HZK Series is part of Renesas' discrete Zener diode portfolio, engineered for precision voltage stabilization in "Standard"-grade applications including office equipment, industrial robots, and communications infrastructure.
FAQ
What is the exact zener voltage range for HZK18LTL-S-E?
The HZK18LTL-S-E has a guaranteed zener voltage range of 16.9 V to 19.0 V when tested at 5 mA DC current and 25 °C ambient temperature. This tolerance reflects the device's grade-specific specification and is verified per Renesas' HZK Series datasheet Rev.3.00. The HZK18LTL-S-E does not include tighter-tolerance variants - its full span defines the usable regulation window in circuit design.
Is HZK18LTL-S-E RoHS compliant?
Yes, the HZK18LTL-S-E is RoHS compliant per EU Directive 2011/65/EU, as confirmed by Renesas Electronics' environmental compliance documentation and material declarations. Lead content is restricted to ≤1000 ppm, and all six RoHS substances are within allowable limits. The HZK18LTL-S-E carries no exemptions and is suitable for consumer and industrial end products sold in regulated markets.
What is the thermal derating behavior of HZK18LTL-S-E above 25°C?
The HZK18LTL-S-E follows linear thermal derating: power dissipation decreases by 4.0 mW/°C above 25 °C ambient, reaching zero at 150 °C on standard FR-4 PCB (per Fig.3 in the datasheet). This means at 75 °C ambient, maximum safe Pd is 300 mW. The HZK18LTL-S-E maintains full electrical specs within this derated envelope as long as junction temperature stays ≤175 °C.
Can HZK18LTL-S-E be used in series or parallel configurations?
No - the HZK18LTL-S-E is not characterized or recommended for series or parallel connection. Zener voltage matching tolerance (±1.1 V) and dynamic resistance variation prevent balanced current sharing. Parallel use risks thermal runaway; series use introduces unpredictable cumulative tolerance and temperature coefficient effects. The HZK18LTL-S-E is intended for single-device shunt regulation only.
Does HZK18LTL-S-E have a specified temperature coefficient?
Yes, the HZK18LTL-S-E has a typical zener voltage temperature coefficient of +0.07 %/°C (or +12.6 mV/°C), derived from Fig.2 in the Renesas HZK Series datasheet. This positive coefficient applies across its operating temperature range and must be factored into precision reference designs where drift beyond ±0.5 % over –20 to +70 °C is unacceptable. The HZK18LTL-S-E data sheet confirms this value is representative for the 18 V variant.
HZK18LTL-S-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:
- -
HZK18LTL-S-E FAQ
1.How can I place an order for HZK18LTL-S-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZK18LTL-S-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 HZK18LTL-S-E reliable?
The price and inventory of HZK18LTL-S-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZK18LTL-S-E is usually 5 days.
3.What payment methods are accepted for HZK18LTL-S-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZK18LTL-S-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZK18LTL-S-E?
HZK18LTL-S-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZK18LTL-S-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 HZK18LTL-S-E?
For technical support, including HZK18LTL-S-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZK18LTL-S-E requirements.
6.How does Aetrix verify that HZK18LTL-S-E is sourced from the original manufacturer or authorized distributors?
All HZK18LTL-S-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 HZK18LTL-S-E meets industry standards.
7.What is the process for return or replacement of HZK18LTL-S-E?
All HZK18LTL-S-E units undergo pre-shipment inspection (PSI). If there is an issue with HZK18LTL-S-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 HZK18LTL-S-E part is unused and in its original packaging.
Return procedure for HZK18LTL-S-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZK18LTL-S-E Tags
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