SM15T12CAY STMicroelectronics TVS Diode (Bi-directional) (Diodes Moulded Non Polarised) In Stock
SM15T12CA is a bidirectional transient voltage suppressor diode rated at 1500 W peak pulse power with a 12 V standoff voltage. It clamps transient overvoltage events to a maximum of 21.7 V, protecting sensitive circuits from ESD and surge events. Packaged in a compact 2-pin DO-214AB (SMC) surface-mount case for automated PCB assembly.
- Manufacturer
- STMicroelectronics
- Package
- Diodes Moulded Non Polarised
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- SM15T12CAY Datasheet PDF
- Category
- TVS Diode (Bi-directional)
- Price
- From $0.2728(MOQ 10)
- Temp Range
- -40.0°C to 150.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SM15T12CAY?
- 1500 W peak pulse power rating for robust transient suppression
- Bidirectional polarity for AC line and bipolar circuit protection
- 12 V nominal breakdown voltage with ±5% tolerance
- Maximum clamping voltage of 21.7 V at peak pulse current
- DO-214AB (SMC) surface-mount package for high-density PCB layouts
- Silicon TVS technology with fast sub-nanosecond response time
What is SM15T12CAY used for?
The SM15T12CA is used to protect 12 V power supply lines and interface circuits in industrial equipment, telecom infrastructure, and automotive electronics from ESD strikes and inductive load switching transients. Its bidirectional configuration makes it ideal for protecting AC signal lines, motor driver outputs, and relay coil flyback suppression in bipolar environments. It is also widely used on RS-485, CAN bus, and analog sensor input lines where bidirectional clamping is required.
What are the specifications of SM15T12CAY?
| Factory Lead Time | 53 Weeks, 1 Day |
| YTEOL | 7.06 |
| Breakdown Voltage-Max | 12.6V |
| Breakdown Voltage-Min | 11.4V |
| Breakdown Voltage-Nom | 12V |
| Clamping Voltage-Max | 21.7V |
| Configuration | SINGLE, 1 CHANNEL |
| Diode Element Material | SILICON |
| Diode Type | TRANS VOLTAGE SUPPRESSOR DIODE |
| JEDEC-95 Code | DO-214AB |
| JESD-30 Code | R-PDSO-C2 |
| Non-rep Peak Rev Power Dis-Max | 1500W |
| Number of Elements | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Polarity | BIDIRECTIONAL |
| Reference Standard | AEC-Q101; IEC-61000-4-2; ISO 10605; MIL-STD-750 |
| Rep Pk Reverse Voltage-Max | 10.2V |
| Reverse Current-Max | 0.2 µA |
| Reverse Test Voltage | 10.2V |
| Surface Mount | YES |
| Technology | AVALANCHE |
| Terminal Form | C BEND |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Package | Diodes Moulded Non Polarised |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8541.10.00.50 |
| Country of Origin | Mainland China |
Where can I find the SM15T12CAY datasheet?
SM15T12CAY Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for SM15T12CAY?
Compatible alternatives and drop-in replacements for SM15T12CAY:
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Frequently Asked Questions
How does the SM15T12CA protect a 12 V supply line from transient overvoltages?
The SM15T12CA clamps voltage spikes above its 12 V standoff to a maximum of 21.7 V during a peak pulse, diverting surge current away from downstream components. With a 1500 W peak pulse power rating and a response time under 1 ns, it reacts faster than most protection circuits, absorbing energy from ESD events, lightning surges, and inductive switching transients. This prevents damage to downstream ICs and capacitors rated for voltages below 25 V.
Why choose a bidirectional TVS diode like the SM15T12CA over a unidirectional type?
A bidirectional TVS diode such as the SM15T12CA is required when the protected line carries AC signals or when positive and negative transient polarity must both be suppressed. Unidirectional TVS devices conduct only in one polarity, leaving the circuit unprotected from reverse-polarity spikes. The SM15T12CA suppresses transients in both directions with a symmetric breakdown voltage of 12 V nominal, making it essential for RS-485 bus lines, motor phase outputs, and AC measurement inputs.
What test standard pulse waveform defines the 1500 W peak power rating of the SM15T12CA?
The 1500 W peak pulse power rating of the SM15T12CA is measured using a standard 10/1000 µs pulse waveform as defined by IEC 61000-4-5 and similar industry standards. Under this pulse condition, the device absorbs up to 1500 W without damage or degradation. For shorter 8/20 µs ESD pulses, the device can handle correspondingly higher peak currents, making it capable of withstanding multiple successive ESD strikes in real-world environments.
Can the SM15T12CA be used on CAN bus interface lines in automotive applications?
Yes, the SM15T12CA is suitable for CAN bus protection in 12 V automotive systems. Its 12 V standoff voltage is compatible with the CAN bus common-mode voltage range, and its 21.7 V maximum clamping voltage prevents damage to CAN transceiver ICs typically rated at 40 V absolute maximum. The DO-214AB package withstands automotive operating temperatures from -40°C to 150°C, meeting thermal requirements for under-hood and dashboard installations.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 10+ | $0.3100 | $3.10 |
| 50+ | $0.2980 | $14.90 |
| 100+ | $0.2820 | $28.20 |
| 1000+ | $0.2728 | $272.80 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”
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