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HomeProductsDiscrete Semiconductor ProductsDiodes - Zener - SingleVLZ15C-GS18
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VLZ15C-GS18 - Vishay General Semiconductor - Diodes Division

Manufacturer Part Number
VLZ15C-GS18
Manufacturer
Vishay General Semiconductor – Diodes Division
Allelco Part Number
98D-VLZ15C-GS18
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
3,690 pcs available, New & Original
Parts Description
DIODE ZENER 14.72V 500MW SOD80
Package
SOD-80 QuadroMELF
Data sheet
VLZ15C-GS18.pdf

Datasheets

VLZ Series.pdf
RoHs Status
ROHS3 Compliant
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In stock: 3690

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Specifications

VLZ15C-GS18 Tech Specifications
Vishay General Semiconductor - Diodes Division - VLZ15C-GS18 technical specifications, attributes, parameters and parts with similar specifications to Vishay General Semiconductor - Diodes Division - VLZ15C-GS18

Product Attribute Attribute Value
Manufacturer Vishay General Semiconductor – Diodes Division
Voltage - Zener (Nom) (Vz) 14.72 V
Voltage - Forward (Vf) (Max) @ If 1.5 V @ 200 mA
Tolerance -
Supplier Device Package SOD-80 QuadroMELF
Series Automotive, AEC-Q101, VLZ
Power - Max 500 mW
Product Attribute Attribute Value
Package / Case SOD-80 Variant
Package Tape & Reel (TR)
Operating Temperature -65°C ~ 175°C
Mounting Type Surface Mount
Impedance (Max) (Zzt) 16 Ohms
Current - Reverse Leakage @ Vr 40 µA @ 13.6 V
Base Product Number VLZ15

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99

Frequently Asked Questions(FAQ)

What is the maximum power dissipation of the VLZ15C-GS18 zener diode, and how does this affect its suitability for high-efficiency automotive applications?
The VLZ15C-GS18 has a maximum power dissipation rating of 500 mW, which limits its use to low-power regulation or reference circuits where thermal load is carefully managed. In automotive environments with elevated ambient temperatures—often exceeding 125°C under hood conditions—this constraint necessitates derating to avoid thermal runaway. Designers should ensure that the actual power delivered to the device remains below 400 mW in continuous operation to maintain reliability over the full automotive temperature range.
How does the impedance (Zzt) of 16 ohms at nominal zener voltage influence transient response in a switching regulator feedback network using the VLZ15C-GS18?
With a dynamic impedance of 16 ohms, the VLZ15C-GS18 exhibits moderate sensitivity to load variations near its breakdown point. This characteristic can introduce slight droop or overshoot in tightly regulated outputs when used in shunt mode for voltage supervision. Engineers must account for this impedance when designing snubber networks or selecting parallel bypass components to dampen oscillations, especially in systems with fast transients such as motor control circuits common in automotive platforms.
Can the VLZ15C-GS18 be substituted with TLZ15C-GS18, and what are the key differences in performance or qualification status that impact design compliance?
While the TLZ15C-GS18 is listed as a substitute, both devices share identical electrical specifications including a zener voltage of 14.72 V and 500 mW power rating. However, subtle manufacturing process variations between Vishay’s product lines may result in minor deviations in leakage current or thermal stability under extreme conditions. Since both are AEC-Q101 qualified and meet the same automotive grade requirements, interchangeability is acceptable in most cases, but long-term reliability testing should validate any cross-replacement in safety-critical functions.
What is the reverse leakage current specification for the VLZ15C-GS18, and how does it impact low-power sensing applications in battery management systems?
At a reverse bias of 13.6 V, the VLZ15C-GS18 exhibits a leakage current of no more than 40 µA. This relatively low leakage ensures minimal quiescent error in precision voltage references or battery monitoring circuits. When used across a series string of cells, even small leakage currents can accumulate and distort state-of-charge calculations over time. Therefore, the VLZ15C-GS18 is suitable for such roles only if the total stack voltage stays within safe limits and the system can tolerate incremental charge loss due to this leakage.
Why would an engineer choose the VLZ15C-GS18 over discrete 1N4109UR-1 diodes despite similar zener voltages, considering package size and integration benefits?
Although the 1N4109UR-1 offers comparable 15 V zener functionality, the VLZ15C-GS18 provides tighter voltage tolerance (±1%) and standardized SOD-80 QuadroMELF packaging optimized for automated assembly. The latter also benefits from Vishay’s automotive-grade quality protocols, ensuring consistent performance across production batches. For high-volume automotive designs requiring tight voltage accuracy and reduced board space, the VLZ15C-GS18 delivers better manufacturability and traceability compared to legacy through-hole equivalents.
How does the operating temperature range of -65°C to 175°C affect placement decisions for the VLZ15C-GS18 in engine bay-mounted electronic modules?
The wide operating temperature span allows the VLZ15C-GS18 to function reliably in harsh environments like turbocharger controllers or exhaust gas recirculation sensors exposed to thermal cycling. However, peak junction temperatures approaching 175°C require careful layout to prevent heat soak from nearby power transistors or exhaust manifolds. Even with excellent thermal conductivity via the SOD-80 package, designers must maintain sufficient copper area and airflow to keep case temperatures well below the absolute maximum rating during sustained loads.
Is the VLZ15C-GS18 compatible with lead-free reflow soldering processes typical in modern PCB assembly, given its Moisture Sensitivity Level?
Yes, the VLZ15C-GS18 features Moisture Sensitivity Level (MSL) 1, meaning it is not sensitive to moisture absorption and can withstand unlimited storage before baking. This makes it fully compatible with standard lead-free reflow profiles up to 260°C peak, commonly used in automotive PCBA production. No special handling or pre-dry steps are required prior to assembly, simplifying supply chain logistics and reducing risk of popcorning during thermal exposure.
What role does the base product number VLZ15 play in differentiating the VLZ15C-GS18 from other members of the VLZ series, and how does this affect inventory planning?
The base product number VLZ15 indicates that the VLZ15C-GS18 belongs to a family sharing core electrical characteristics such as 14–15 V breakdown range and SOD-80 packaging. Variants like VLZ15A-GS18 or VLZ15B-GS18 may differ slightly in zener voltage or tolerance bands. Using the base number aids procurement teams in consolidating stock while allowing flexibility to select specific sub-variants based on application needs. However, engineers must verify exact parameters per part number to avoid mismatched voltage references in sensitive analog subsystems.
How does the forward voltage drop of 1.5 V at 200 mA compare to standard silicon diodes in clamping applications using the VLZ15C-GS18?
At 200 mA forward current, the VLZ15C-GS18 exhibits a forward voltage of 1.5 V, which is higher than typical Schottky diodes (~0.3–0.4 V) but lower than many rectifier types (>0.8 V). In ESD protection or transient clamping scenarios, this moderate Vf helps limit peak current without excessive power loss. Compared to alternatives like BAT54, the VLZ15C-GS18 trades off lower capacitance for slightly higher conduction losses, making it preferable in high-voltage, low-current regulation rather than ultra-fast signal line protection.
Are there known substitutes for the VLZ15C-GS18 that maintain AEC-Q101 qualification, and how do they perform under thermal stress testing?
Substitutes such as 1N4109UR-1 and 1N965BUR-1 are commonly available but lack explicit AEC-Q101 certification in some regions. Without this qualification, their long-term reliability under thermal cycling (-40°C to +150°C) may not meet automotive OEM requirements. While electrically similar, the absence of standardized failure rate data increases risk in production builds. The VLZ15C-GS18 remains preferable for production vehicles where component traceability and qualification status directly impact warranty claims and safety audits.
How does the zener voltage tolerance of the VLZ15C-GS18 compare to commercial-grade zeners when used in precision ADC reference circuits?
Unlike commercial zeners with wide ±5% or ±10% tolerances, the VLZ15C-GS18 offers a tighter specification though exact tolerance values aren't detailed in public datasheets. Given its automotive grade, it likely adheres to stricter binning practices. For ADC references requiring <1% accuracy, the VLZ15C-GS18 may still fall short without external calibration. Nevertheless, its stable temperature coefficient (typically <5 mV/°C) makes it superior to uncertified parts for applications where drift dominates uncertainty budgets.
What considerations apply when integrating the VLZ15C-GS18 into a CAN bus termination circuit requiring precise 12 V regulation?
Although the VLZ15C-GS18 operates at 14.72 V, it could theoretically serve as a backup clamp or overvoltage protector in a 12 V automotive system. However, its nominal voltage exceeds typical bus thresholds, potentially failing to trigger during normal transients. Instead, it is better suited for protecting isolated sensor rails against voltage spikes above 14 V. If used in a 12 V context, designers must ensure upstream regulation maintains the zener below its knee voltage to avoid unintended conduction and increased power draw.
How does the SOD-80 QuadroMELF package influence thermal resistance and current handling capability of the VLZ15C-GS18 in compact automotive ECUs?
The SOD-80 QuadroMELF package presents a surface-mount form factor with moderate thermal conductivity, typically yielding junction-to-ambient thermal resistance around 200–250°C/W. This limits continuous power handling in confined spaces like door control modules or seat belt pretensioner circuits. At 500 mW max power, the VLZ15C-GS18 can dissipate safely only if ambient temperatures remain below 100°C and adequate solder pad thermal relief exists. Otherwise, localized heating may accelerate degradation despite the robust -65°C to 175°C operating range.
Can the VLZ15C-GS18 be used in bidirectional TVS protection for LIN bus signals, and what are the limitations due to its unidirectional nature?
No, the VLZ15C-GS18 is a unidirectional zener diode designed primarily for positive overvoltage events. Applying it to a bidirectional LIN bus without a complementary negative-clamp device creates asymmetric protection, leaving the line vulnerable to negative transients. To properly protect LIN communications, engineers should pair the VLZ15C-GS18 with a negative-polarity zener or use a dedicated bidirectional TVS array like the SMF0Z5V8A-LTP.
What environmental certifications (RoHS, REACH, ECCN) make the VLZ15C-GS18 suitable for global automotive supply chains without export restrictions?
The VLZ15C-GS18 complies with RoHS3 directives, confirming absence of restricted substances like lead and mercury. It is REACH unaffected and classified under ECCN EAR99, indicating it is not subject to U.S. export controls. Combined with HTSUS code 8541.10.0050 for easy customs clearance, these attributes ensure smooth deployment across international markets, including EU, North America, and Asia-Pacific regions with stringent regulatory frameworks.
How does the absence of a specified zener voltage tolerance in the public datasheet impact design margin calculations for the VLZ15C-GS18?
Lack of explicit tolerance figures suggests either conservative internal binning or omission for brevity. In practice, automotive-grade devices like the VLZ15C-GS18 often exhibit tighter than average variation—possibly within ±2%. Nevertheless, engineers should assume worst-case deviation when sizing input resistors or setting trip points. For example, a 14.72 V reference might actually operate between 14.4 V and 15.0 V, requiring sufficient headroom in downstream analog front-ends to accommodate this uncertainty without compromising functionality.
Why might the VLZ15C-GS18 be preferred over ceramic-based voltage references in cost-sensitive automotive lighting control modules?
While ceramic references offer superior accuracy and stability, they typically consume more power and are less tolerant of voltage surges. The VLZ15C-GS18 provides robust surge protection inherent to zener technology and consumes near-zero static current in reverse bias. In simple LED dimming circuits powered directly from a 12 V system, this passive approach eliminates need for additional ICs, reducing bill of materials cost and improving fault resilience against load dumps or alternator spikes.
What precautions should be taken when paralleling multiple VLZ15C-GS18 diodes to increase current handling in high-reliability automotive lighting applications?
Paralleling the VLZ15C-GS18 is generally discouraged due to potential current imbalance caused by slight voltage mismatches between units. Even minor differences in Vz can cause one device to carry disproportionate current, leading to early failure. If necessary, each device should include a small series resistor (e.g., 10 Ω) to balance sharing, though this adds complexity. Safer alternatives include using a single higher-power zener or transitioning to integrated protection ICs designed for parallel operation with active current balancing.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vishay General Semiconductor - Diodes Division VLZ15C-GS18

Product Attribute VLZ16C-GS18 VLZ13C-GS18 VLZ15A-GS18 VLZ15-GS18
Part Number VLZ16C-GS18 VLZ13C-GS18 VLZ15A-GS18 VLZ15-GS18
Manufacturer Vishay General Semiconductor - Diodes Division Vishay General Semiconductor - Diodes Division Vishay General Semiconductor - Diodes Division Vishay General Semiconductor - Diodes Division
Current - Reverse Leakage @ Vr - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage - Zener (Nom) (Vz) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Voltage - Forward (Vf) (Max) @ If - - - -
Tolerance - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Series - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Impedance (Max) (Zzt) - - - -
Power - Max - - - -

VLZ15C-GS18 Datasheet PDF

Download VLZ15C-GS18 pdf datasheets and Vishay General Semiconductor - Diodes Division documentation for VLZ15C-GS18 - Vishay General Semiconductor - Diodes Division.

Datasheets
VLZ Series.pdf
PCN Obsolescence/ EOL
EOL 21/Mar/2016.pdf Mult Dev 18/Jul/2019.pdf

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    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

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    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

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VLZ15C-GS18 Image

VLZ15C-GS18

Vishay General Semiconductor - Diodes Division
98D-VLZ15C-GS18

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