SM30T18AY STMicroelectronics TVS Diode (Uni-directional) (Other) In Stock
SM30T18AY is an automotive-grade unidirectional TVS diode rated at 3000 W peak pulse power in an SMC package, with a 17.6 V nominal breakdown voltage and 24.4 V maximum clamping voltage. It is MIL-STD-750 tested, providing robust transient overvoltage protection for automotive and industrial circuits.
- Manufacturer
- STMicroelectronics
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- SM30T18AY Datasheet PDF
- Category
- TVS Diode (Uni-directional)
- Price
- From $0.4777(MOQ 10)
- Temp Range
- -55.0°C to 150.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3000 W peak pulse power dissipation for high-energy transient absorption
- Unidirectional TVS configuration for DC rail protection
- 17.6 V nominal breakdown voltage, 24.4 V maximum clamping voltage
- Automotive-grade qualification for 12 V to 24 V vehicle electrical systems
- MIL-STD-750 tested for military and high-reliability applications
- SMC (DO-214AB) surface-mount package with low inductance
- Silicon avalanche technology for fast sub-nanosecond response time
- Single-channel configuration for discrete line protection
Applications
SM30T18AY is used in automotive ECUs, alternator output protection, and 12 V to 24 V vehicle bus clamping where load-dump transients can exceed 60 V for tens of milliseconds. Its 3000 W peak pulse capability protects sensitive power supply inputs, CAN/LIN bus transceivers, and motor driver circuits in body control modules. The device also suits industrial power supply inputs and military electronics requiring MIL-STD-750 compliant surge protection on DC rails up to 18 V.
Specifications
| Reach Compliance Code | Not Compliant |
| Factory Lead Time | 53 Weeks, 1 Day |
| YTEOL | 8 |
| Additional Feature | MIL-STD-750 |
| Breakdown Voltage-Max | 18.5V |
| Breakdown Voltage-Min | 16.7V |
| Breakdown Voltage-Nom | 17.6V |
| Clamping Voltage-Max | 24.4V |
| 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 |
| JESD-609 Code | e3 |
| Non-rep Peak Rev Power Dis-Max | 3000W |
| Number of Elements | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Polarity | UNIDIRECTIONAL |
| Reference Standard | AEC-Q101; IEC-61000-4-2, 4-4; ISO 7637-2 |
| Rep Pk Reverse Voltage-Max | 15V |
| Reverse Current-Max | 0.2 µA |
| Reverse Test Voltage | 15V |
| Surface Mount | YES |
| Technology | AVALANCHE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | C BEND |
| Terminal Position | DUAL |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8541.10.00.50 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How much peak pulse power can SM30T18AY absorb, and over what pulse duration is that rating specified?
SM30T18AY is rated for 3000 W peak pulse power, typically specified over a 10/1000 µs waveform per industry standards. This high energy absorption capacity is required for automotive load-dump protection on 12 V and 24 V vehicle systems where transient spikes can persist for several milliseconds.
At what voltage does SM30T18AY clamp transients in a 12 V automotive circuit?
The device has a nominal breakdown voltage of 17.6 V (range 16.7 V to 18.5 V) and a maximum clamping voltage of 24.4 V at peak test current. This ensures that transients on a 12 V automotive bus are clamped below 24.4 V, protecting downstream ECU components rated for 28 V or less.
Which reliability standard applies to SM30T18AY, and why does that matter for defense procurement?
SM30T18AY is tested to MIL-STD-750, the US military standard for semiconductor device test methods, covering thermal, electrical, and mechanical characterization. Defense procurement engineers specify MIL-STD-750 tested parts to ensure traceability and consistency across lots used in mission-critical electronics and ruggedized vehicle systems.
What package does SM30T18AY use, and what advantages does the SMC package offer for high-power TVS applications?
The device uses an SMC (DO-214AB) surface-mount package, which provides a low-inductance current path and a large thermal pad for heat dissipation compared to smaller SOD-123 or SOD-323 packages. The SMC footprint accommodates the 3000 W peak pulse rating while enabling automated PCB assembly in automotive module production.
Is SM30T18AY suitable for protecting 24 V truck electrical systems, and what is the expected clamping behavior?
Yes, SM30T18AY is suitable for 24 V heavy-duty truck systems because its breakdown voltage range of 16.7 V to 18.5 V keeps the device off during normal 24 V bus operation, while the 24.4 V maximum clamping voltage limits transient spikes to safe levels for protected loads. The unidirectional configuration handles the rectified DC polarity of standard vehicle electrical architectures.
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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+ | $1.1500 | $11.50 |
| 100+ | $0.8300 | $83.00 |
| 500+ | $0.6700 | $335.00 |
| 1000+ | $0.6244 | $624.43 |
| 7500+ | $0.4912 | $3684.30 |
| 10000+ | $0.4777 | $4776.80 |
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