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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) - TVS Diodes > SMCJ12A-13
Diodes Incorporated
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SMCJ12A-13

Manufacturer Part Number:
SMCJ12A-13
Manufacturer / Brand
Diodes Incorporated
Part of Description:
TVS DIODE 12VWM 19.9VC SMC
Datasheets:
SMCJ12A-13(1).pdfSMCJ12A-13(2).pdf
Lead Free Status / RoHS Status:
RoHS non-compliant
Stock Condition:
New original, 43926 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number SMCJ12A-13
Manufacturer / Brand Diodes Incorporated
Stock Quantity 43926 pcs Stock
Category Circuit Protection > Transient Voltage Suppressors (TVS) - TVS Diodes
Description TVS DIODE 12VWM 19.9VC SMC
Lead Free Status / RoHS Status: RoHS non-compliant
Voltage - Reverse Standoff (Typ) 12V
Voltage - Clamping (Max) @ Ipp 19.9V
Voltage - Breakdown (Min) 13.3V
Unidirectional Channels 1
Type Zener
Supplier Device Package SMC
Series -
Power Line Protection No
Power - Peak Pulse 1500W (1.5kW)
Package / Case DO-214AB, SMC
Package Tape & Reel (TR)
Operating Temperature -55°C ~ 150°C (TJ)
Mounting Type Surface Mount
Current - Peak Pulse (10/1000µs) 75.3A
Capacitance @ Frequency -
Base Product Number SMCJ12
Applications General Purpose

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



We accept the payment terms: Telegraphic Transfer(T/T), Credit Card, PayPal and Western Union.

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PayPal Bank Information:
Company Name : IC COMPONENTS LTD
Paypal ID: PayPal@IC-Components.com

BANK TRANSFAR (Telegraphic Transfer)

Payment For Telegraphic Transfers:
Company Name : IC COMPONENTS LTD Beneficiary Account Number : 549-100669-701
Beneficiary Bank name : Bank of Communications (Hong Kong) Ltd Beneficiary Bank Code : 382 (for local payment)
Beneficiary Bank SWIFT : COMMHKHK
Beneficiary Bank Address : Tsuen Wan Market Street Branch 53 Market Street, Tsuen Wan N.T., Hong Kong

Any inquires or questions, please kindly contact us Email: Info@IC-Components.com


Frequently Asked Questions

How should SMCJ12A-13 be placed on a 12V input so it actually protects the downstream DC/DC converter?
For SMCJ12A-13, place the device at the connector or entry point, before any long trace or series element, and give it a very short, low-inductance return to the same ground reference used by the protected circuit. If the surge current has to travel through narrow copper or multiple vias, the residual voltage at the load can rise well above the 19.9V clamp rating. For sensitive converters, route the protected line through a fuse or small series impedance only if the TVS is still on the connector side of the surge path.
Is SMCJ12A-13 a good fit for a 12V rail that can sit at 13.2V to 14.4V during normal operation?
SMCJ12A-13 can work on a 12V rail only if the steady-state maximum stays below its 13.3V breakdown point with enough margin for tolerance and temperature. If the rail regularly reaches 13.8V to 14.4V, the device can begin to conduct leakage or bias the supply, so a higher-standoff part such as SMCJ15A is usually a better electrical fit. The trade-off is a higher clamp voltage under surge, so the downstream circuitry must tolerate the larger residual spike.
Can SMCJ12A-13 be used on relay coils, solenoids, or other inductive loads instead of a plain flyback diode?
SMCJ12A-13 can be used as a clamp across an inductive load when faster release time is needed than a simple diode allows. Compared with a flyback diode, it lets the coil voltage rise higher during turn-off, which reduces release delay, but the driver must tolerate the higher clamping level and energy. If the control transistor or MOSFET has a low voltage rating, a standard diode or a different clamp strategy is safer than relying on SMCJ12A-13 alone.
Is SMCJ12A-13 suitable for automotive load-dump or jump-start protection?
SMCJ12A-13 is usually not sized as the only protection element for load-dump or jump-start events on a vehicle battery line. Its 1.5kW surge rating is aligned with short 10/1000 µs transients, while load-dump pulses are longer and can deliver much more energy. In automotive-style input stages, SMCJ12A-13 is better treated as part of a layered front end that may include a fuse, series impedance, and an automotive-rated suppressor with a higher surge energy budget.
Should I choose SMCJ12A-13 or SMCJ15A for a noisy 12V industrial supply?
SMCJ12A-13 gives lower surge clamp voltage, so it helps keep the protected rail closer to the downstream IC limit during short spikes. SMCJ15A gives more headroom above a 12V nominal rail that can drift upward during startup, charging, or long cable drop recovery. If the supply can legitimately exceed 13.3V in normal service, SMCJ15A is often the cleaner choice; if the rail stays tightly regulated near 12V, SMCJ12A-13 usually provides tighter transient control.
Can SMCJ12A-13 protect a bidirectional or AC-coupled signal line?
SMCJ12A-13 is a unidirectional TVS, so it is best used on DC lines with a defined positive polarity. For bidirectional signal paths, RS-485-style interfaces, or AC-coupled nodes that can swing both above and below ground, a bidirectional TVS is usually a better match because it avoids forward-conduction asymmetry and distortion of the negative half-cycle. If a line can see negative surges relative to ground, confirm that the unidirectional behavior of SMCJ12A-13 will not interfere with the circuit’s operating range.
What should I check before replacing another 12V TVS with SMCJ12A-13?
With SMCJ12A-13, check three points before a cross-grade swap: the PCB footprint must match the DO-214AB/SMC land pattern, the surge energy rating must cover the pulse shape in your application, and the clamp voltage must still stay below the maximum withstand of the protected IC. Direct-fit alternatives such as SMCJ12A or TPSMD12A may work when the package and ratings are aligned, while SMDJ12A-T7 or 5.0SMDJ12A-T7 may require a fresh review of thermal behavior, board area, and the exact surge class because part families can differ even when the voltage code looks similar.
Is SMCJ12A-13 appropriate for long cable runs or external I/O that leave the enclosure?
SMCJ12A-13 can help with cable-entry transients, but for long external runs it is often only one layer of the protection stack. Cable inductance can turn a fast surge into a higher local voltage if the TVS is placed far from the connector, and repeated events can heat the device more than a single lab pulse suggests. For exposed I/O, combine SMCJ12A-13 with short routing, proper grounding, and, when needed, series resistance, common-mode filtering, or a secondary clamp closer to the sensitive IC.
How does SMCJ12A-13 behave in repeated surge or industrial environments over time?
SMCJ12A-13 can survive many transient events when the surge energy and junction temperature stay within limits, but repeated high-energy hits can shift leakage and reduce margin long before a visible failure occurs. In industrial systems, it helps to size the device for the actual pulse repetition rate, not just the headline 75.3A Ipp figure, and to leave thermal headroom on the PCB copper. If the environment includes frequent EFT, relay kick, or cable hot-plugging, periodic validation of clamp performance is a practical part of the reliability plan.
Are there any sourcing or compliance checks to make before standardizing on SMCJ12A-13?
For SMCJ12A-13, confirm that the compliance status matches your program requirements before locking it into a released BOM, because procurement systems may flag the part differently from a RoHS-compliant TVS. From a build standpoint, the device’s MSL 1 rating simplifies storage and assembly logistics, but design sign-off should still cover footprint compatibility, approved alternates, and whether the chosen part number is acceptable for the target market and customer documentation.

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