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ZM4746A-GS18
Vishay General Semiconductor - Diodes Division
DIODE ZENER 18V 1W DO213AB
34900 Pcs New Original In Stock
Zener Diode 18 V 1 W ±5% Surface Mount DO-213AB
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5.0 / 5.0
- (217 Ratings)
ZM4746A-GS18
Product Overview
12786819
DiGi Electronics Part Number
ZM4746A-GS18-DGManufacturer
Vishay General Semiconductor - Diodes Division
ZM4746A-GS18
Description
DIODE ZENER 18V 1W DO213ABInventory
34900 Pcs New Original In Stock
Zener Diode 18 V 1 W ±5% Surface Mount DO-213AB
Quantity
Minimum 1
Minimum 1
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ZM4746A-GS18 Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Voltage - Zener (Nom) (Vz)
18 V
Tolerance
±5%
Power - Max
1 W
Impedance (Max) (Zzt)
20 Ohms
Current - Reverse Leakage @ Vr
5 µA @ 13.7 V
Operating Temperature
175°C
Grade
Automotive
Qualification
AEC-Q101
Mounting Type
Surface Mount
Package / Case
DO-213AB, MELF (Glass)
Supplier Device Package
DO-213AB
Base Product Number
ZM4746
Datasheet & Documents
HTML Datasheet
ZM4746A-GS18-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8541.10.0050
Additional Information
Other Names
ZM4746A-GS18GITR
ZM4746A-GS18GIDKR
ZM4746A-GS18GICT
Standard Package
5,000
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Les prix sont compétitifs, et la qualité est au rendez-vous, je recommande.
Dec 02, 2025
Sehr beeindruckende Versandgeschwindigkeit und exzellenter Kundenservice.
Dec 02, 2025
急ぎの注文にもかかわらず、すぐに対応していただき、本当に助かりました。
Dec 02, 2025
Friendly and helpful staff combined with great prices create a perfect shopping experience.
Dec 02, 2025
I am consistently impressed by their quick and thorough after-sales assistance.
Dec 02, 2025
Their delivery speed is one of the best in the industry.
Dec 02, 2025
Their product variety ensures we are never limited and always have access to the latest educational innovations.
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Frequently Asked Questions (FAQ)
Can the ZM4746A-GS18 be safely used in an automotive 12V system for overvoltage protection on a CAN bus line, and what are the key risks if the load dump transient exceeds 40V?
Yes, the ZM4746A-GS18 is AEC-Q101 qualified and rated for 18V nominal Zener voltage with a ±5% tolerance (17.1V to 18.9V), making it suitable for clamping in 12V automotive systems. However, during ISO 7637-2 load dump events that can reach 40V or higher, the 1W power rating may be exceeded unless properly derated. To mitigate risk, use a series current-limiting resistor or pair it with a TVS diode rated for higher surge energy. Always validate thermal performance at 175°C operating temperature, as sustained clamping near max power can degrade long-term reliability.
What are the critical layout considerations when replacing a through-hole 1N5349B zener diode with the surface-mount ZM4746A-GS18 in a high-vibration industrial control board?
The ZM4746A-GS18 in DO-213AB (MELF) package offers better mechanical stability than standard SMD diodes due to its cylindrical glass body, but proper pad design and solder fillet control are essential to prevent cracking under vibration. Use a symmetrical land pattern with adequate solder relief and avoid placing the component near board edges or flex points. Unlike the 1N5349B, which benefits from axial lead strain relief, the ZM4746A-GS18 relies entirely on solder joints—ensure IPC-7351-compliant footprints and consider conformal coating to reduce mechanical stress. Thermal cycling performance is superior, but mechanical mounting integrity is the primary concern in high-vibration environments.
How does the ZM4746A-GS18 compare to the BZX84C18L in terms of leakage current stability over temperature in a precision 18V reference circuit for a medical sensor interface?
While both diodes offer 18V nominal Zener voltage, the ZM4746A-GS18 has a specified reverse leakage of 5 µA @ 13.7V, whereas the BZX84C18L typically leaks more above 100°C. In precision applications, the ZM4746A-GS18’s tighter leakage control and automotive-grade qualification provide better thermal stability up to 175°C. However, for ultra-low-noise references, consider that Zener noise increases with current—operate the ZM4746A-GS18 at ≥2 mA to stay in the flat region of the I-V curve. The BZX84C18L may suffice for non-critical designs, but the ZM4746A-GS18 is preferred when drift over temperature could affect sensor calibration.
Is it safe to parallel two ZM4746A-GS18 diodes to achieve 2W power handling in a motor driver snubber circuit, and what derating rules should be applied?
Paralleling ZM4746A-GS18 diodes is not recommended due to inherent Vz mismatch (±5% tolerance), which causes unequal current sharing and thermal runaway risk—even small voltage differences lead to one diode conducting significantly more current. Instead, select a single higher-power zener like the 5W 1N5349BG or use a dedicated transient suppressor. If paralleling is unavoidable, add individual ballast resistors (e.g., 10–22 Ω, 1W) in series with each diode to force current balancing. Always derate total power to ≤60% of combined rating (i.e., <1.2W total) and ensure adequate airflow, as the DO-213AB package has limited thermal dissipation compared to larger packages.
Can the ZM4746A-GS18 be used as a direct replacement for the MMSZ5232B in a 3.3V MCU power rail clamp, and what hidden failure modes should I watch for?
No—the ZM4746A-GS18 is a 18V zener and cannot replace the 3.3V MMSZ5232B without risking catastrophic overvoltage damage to the MCU. Even under transient conditions, the ZM4746A-GS18 will not begin conducting until ~17V, far above the absolute maximum rating of most 3.3V logic (typically 3.6–4.0V). Using it in this role creates a false sense of protection while offering none. For 3.3V rails, stick to low-voltage zeners like MMSZ5232B or consider active clamping with a TVS array. Misapplication of higher-voltage zeners like the ZM4746A-GS18 in low-voltage systems is a common design error that leads to latent field failures.
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ZM4746A-GS18 CAD Models
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