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Renesas HZK18TL-S-E
- Part No.:
- HZK18TL-S-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZK18TL-S-E.pdf
- Description:
- DIODE ZENER 0.5W
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
HZK18TL-S-E from Renesas Electronics is a silicon epitaxial planar Zener diode designed for precision voltage regulation in stabilized power supplies. It delivers a nominal zener voltage of 18 V (min 16.9 V, max 19.0 V at 5 mA), with dynamic resistance of 55 Ω, maximum power dissipation of 500 mW, and low leakage current - used in compact DC-DC feedback loops and reference circuits.
For engineers reviewing the HZK18TL-S-E datasheet, HZK18TL-S-E pinout, HZK18TL-S-E application, or HZK18TL-S-E equivalent, key selection criteria include zener voltage tolerance (±5.6% at 18 V), temperature coefficient (≈+4.5 mV/°C), LLD surface-mount package compatibility, and 55 Ω dynamic impedance under 5 mA test current.
Technical Context
The HZK18TL-S-E operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its breakdown threshold. Its epitaxial planar construction ensures consistent zener impedance and low noise performance across industrial temperature ranges (–55°C to +175°C).
It is rated for 500 mW power dissipation on PCB, with junction temperature limited to 175°C and storage temperature spanning –55°C to +175°C. The device exhibits a positive temperature coefficient (~+4.5 mV/°C) typical for 18 V-class Zeners, enabling predictable drift compensation in reference designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.9 V to 19.0 V at IZ = 5 mA - defines regulation window for feedback sensing in 18 V supply rails. |
| Dynamic Resistance (rd) | 55 Ω max at IZ = 5 mA - determines load regulation error and ripple rejection capability. |
| Power Dissipation (Pd) | 500 mW max on PCB - sets thermal derating limit for continuous operation in compact layouts. |
| Reverse Current (IR) | 1 µA max at VR = 13 V - ensures minimal quiescent loss in high-impedance bias networks. |
| Junction Temperature (Tj) | 175°C max - supports reliable operation in enclosed industrial enclosures without forced cooling. |
| Temperature Coefficient (γZ) | +4.5 mV/°C approx. - enables predictable voltage drift modeling for temperature-compensated references. |
Pinout & Package
Package: LLD - leadless, surface-mount, 2-pin epoxy-molded package (1.4 mm diameter, 0.35 mm height, 0.027 g mass), optimized for high-density PCB assembly and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode band) | Zener cathode | Connected to regulated output node; reverse-biased terminal where voltage is sensed and clamped. |
| 2 (Anode) | Zener anode | Connected to ground or lower-potential rail; completes shunt path for excess current during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance | 55 Ω max at 5 mA - improves regulation accuracy under varying load conditions in feedback paths. |
| Wide zener voltage range coverage | Part of HZK Series spanning 1.9 V to 38 V - enables standardized sourcing across multiple supply rails. |
| LLD surface-mount package | 1.4 mm diameter, 0.35 mm height - supports automated placement and high board density in space-constrained designs. |
| High junction temperature rating | 175°C - allows operation in thermally demanding environments such as industrial motor drives and power converters. |
Applications
| DC Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or buck converter secondary-side regulation. IC Role / Device Role: Shunt voltage reference providing precise 18 V setpoint for optocoupler-based error amplification. Use Value: Maintains ±5.6% output tolerance across line/load variations and temperature, reducing need for trimming resistors. |
Use Scenario: Clamping transient surges on 15–20 V logic or sensor supply lines in factory automation systems. IC Role / Device Role: Passive overvoltage clamp limiting rail excursion to ≤19.0 V during ESD or inductive kick events. Use Value: Absorbs up to 500 mW surge energy without degradation, protecting downstream 18 V-rated ADCs and microcontrollers. |
| Temperature-Compensated Reference | Low-Power Bias Network |
Use Scenario: Generating stable bias for op-amp input stages in precision analog front-ends operating from 24 V rails. IC Role / Device Role: Zener-based reference with known +4.5 mV/°C drift, paired with negative-TC components for net-zero drift. Use Value: Enables <100 ppm/°C reference stability in instrumentation-grade signal conditioning without active circuitry. |
Use Scenario: Providing bias current to phototransistor isolators or low-power comparators in battery-backed monitoring circuits. IC Role / Device Role: Low-leakage (≤1 µA at 13 V) shunt regulator establishing fixed 18 V node with minimal standby drain. Use Value: Extends battery life in always-on sensors by limiting quiescent current while preserving regulation integrity. |
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 | 500 mW SOT-23 package; VZ = 17.5–18.5 V (±5.6%); rd = 45 Ω; higher leakage (≤5 µA @ 14.4 V) | SOT-23 footprint differs - requires PCB redesign; better dynamic impedance but higher leakage limits ultra-low-power use. | Select when SMT assembly infrastructure favors SOT-23 and tighter VZ distribution is prioritized over leakage. |
| MMBZ5245B | 350 mW SOT-23; VZ = 17.1–18.9 V; rd = 35 Ω; Tj = 150°C; RoHS-compliant | Lower power rating and junction temperature - unsuitable for high-ambient industrial environments above 100°C ambient. | Choose for cost-sensitive consumer applications where 350 mW derating and 150°C Tj are acceptable. |
Compared with BZX84-C18LT1G and MMBZ5245B, the HZK18TL-S-E offers superior thermal robustness (175°C Tj), lower leakage (1 µA vs. ≥5 µA), and LLD package compatibility with high-density reflow processes - making it preferred for industrial power regulation where reliability and layout efficiency are critical.
Availability
HZK18TL-S-E is available at Aetrix Electronics and suitable for industrial power supplies, factory automation controllers, and embedded sensor interface modules requiring stable component supply with long-term lifecycle support and traceable sourcing.
Supply support for HZK18TL-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 leader specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and enterprise applications.
The HZK Series was developed as a family of precision Zener diodes for stabilized DC power supply regulation - targeting high-reliability, low-drift voltage references in industrial and communications equipment where standard-grade quality suffices.
FAQ
What is the exact zener voltage range for HZK18TL-S-E at 5 mA test current?
The HZK18TL-S-E has a specified zener voltage range of 16.9 V to 19.0 V when tested at IZ = 5 mA, per Renesas' HZK Series datasheet Rev.3.00. This ±5.6% tolerance reflects the device's grade-specific regulation window and must be accounted for in feedback divider design. The HZK18TL-S-E does not carry A/B/C suffix grading, indicating it meets the base HZK18 specification without further binning.
Is HZK18TL-S-E compatible with lead-free reflow soldering processes?
Yes, the HZK18TL-S-E uses an LLD package qualified for standard Pb-free reflow profiles, including peak temperatures up to 260°C for 10 seconds. Its epoxy molding compound and metallization system comply with JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for surface-mount assembly. The HZK18TL-S-E is RoHS-compliant and suitable for modern manufacturing lines.
Does HZK18TL-S-E have a documented temperature coefficient, and how does it affect regulation accuracy?
The HZK18TL-S-E exhibits a positive temperature coefficient of approximately +4.5 mV/°C, consistent with 18 V-class Zeners in the HZK Series. This means its zener voltage increases linearly with temperature - a factor critical when designing temperature-stable references. For example, a 50°C rise causes ~225 mV shift, which must be compensated using complementary TC components or calibration. The HZK18TL-S-E datasheet confirms this behavior in Figure 2.
Can HZK18TL-S-E replace older NEC-branded HZK18 parts in existing designs?
Yes, the HZK18TL-S-E is a direct continuation of the original NEC HZK18 series, maintained under Renesas Electronics after the 2010 merger. Electrical specifications, package dimensions, and marking conventions remain identical. The "TL-S-E" suffix denotes tape-and-reel packaging and enhanced environmental compliance - no functional or parametric changes affect drop-in replacement in legacy PCBs designed for HZK18 variants.
What is the maximum reverse leakage current for HZK18TL-S-E, and at what voltage is it measured?
The HZK18TL-S-E has a maximum reverse leakage current (IR) of 1 µA, measured at VR = 13 V and Ta = 25°C. This low leakage supports high-impedance bias networks and minimizes standby power loss in battery-operated systems. The value is confirmed in the "Electrical Characteristics" table on page 3 of the official Renesas HZK Series datasheet (Rev.3.00).
HZK18TL-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:
- -
HZK18TL-S-E FAQ
1.How can I place an order for HZK18TL-S-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZK18TL-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 HZK18TL-S-E reliable?
The price and inventory of HZK18TL-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 HZK18TL-S-E is usually 5 days.
3.What payment methods are accepted for HZK18TL-S-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZK18TL-S-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZK18TL-S-E?
HZK18TL-S-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZK18TL-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 HZK18TL-S-E?
For technical support, including HZK18TL-S-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZK18TL-S-E requirements.
6.How does Aetrix verify that HZK18TL-S-E is sourced from the original manufacturer or authorized distributors?
All HZK18TL-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 HZK18TL-S-E meets industry standards.
7.What is the process for return or replacement of HZK18TL-S-E?
All HZK18TL-S-E units undergo pre-shipment inspection (PSI). If there is an issue with HZK18TL-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 HZK18TL-S-E part is unused and in its original packaging.
Return procedure for HZK18TL-S-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZK18TL-S-E Tags
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