SM15T27A STMicroelectronics TVS Diode (Uni-directional) (Diodes Moulded Non Polarised) In Stock
STMicroelectronics SM15T27A is a 1500 W unidirectional TVS diode with 27 V nominal breakdown voltage and 48.3 V maximum clamping voltage in an SMC package. Provides robust transient overvoltage protection for 24 V systems. Available in stock worldwide.
- Manufacturer
- STMicroelectronics
- Package
- Diodes Moulded Non Polarised
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- SM15T27A Datasheet PDF
- Category
- TVS Diode (Uni-directional)
- Price
- From $0.2980(MOQ 1)
- Temp Range
- -55.0°C to 150.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 1500 W peak pulse power dissipation at 10/1000 µs waveform with 27 V nominal breakdown voltage for robust transient suppression
- Maximum clamping voltage of 48.3 V at peak pulse current protecting sensitive 24 V rail components from voltage spikes
- SMC (DO-214AB) surface-mount package with UL recognition enabling compact, high-reliability ESD and surge protection on industrial PCBs
Applications
The SM15T27A protects 24 V supply rails and signal lines in industrial automation, motor drive interfaces, and power distribution equipment from transient voltage surges caused by inductive load switching or lightning-induced line transients. Its 1500 W peak pulse rating handles high-energy EFT (electrical fast transient) and surge events per IEC 61000-4-4 and IEC 61000-4-5 standards. The SMC package allows high-volume SMT assembly on protection boards for PLCs, variable frequency drives, and field instruments.
Specifications
| Factory Lead Time | 53 Weeks, 1 Day |
| YTEOL | 7.06 |
| Additional Feature | UL RECOGNIZED |
| Breakdown Voltage-Max | 28.4V |
| Breakdown Voltage-Min | 25.7V |
| Breakdown Voltage-Nom | 27V |
| Clamping Voltage-Max | 48.3V |
| 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 | 1500W |
| Number of Elements | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Polarity | UNIDIRECTIONAL |
| Qualification Status | Not Qualified |
| Reference Standard | IEC-61000-4-2, 4-4, 4-5; MIL-STD-750; MIL-STD-883 |
| Rep Pk Reverse Voltage-Max | 23V |
| Reverse Current-Max | 5 µA |
| Reverse Test Voltage | 23V |
| Surface Mount | YES |
| Technology | AVALANCHE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | C BEND |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Diodes Moulded Non Polarised |
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
What peak pulse power can the SM15T27A handle and over what pulse waveform is this rating specified?
The SM15T27A is rated for 1500 W peak pulse power dissipation measured at a 10/1000 µs surge waveform as defined by JEDEC standard test conditions. This rating covers the energy delivered by industrial transients from inductive load switching on 24 V lines, motor back-EMF spikes, and lightning-coupled surges on unshielded field wiring. For shorter ESD pulses at 8/20 µs, the effective clamping current is even higher, providing robust protection.
At what voltage does the SM15T27A clamp transient spikes to protect downstream 24 V system components?
The SM15T27A clamps transient overvoltages to a maximum of 48.3 V at its rated peak pulse current, with a nominal breakdown voltage of 27 V and a breakdown range of 25.7 V to 28.4 V. This clamping level is compatible with 24 V industrial bus interfaces, ensuring that voltage spikes on the supply rail are limited before reaching FETs, gate drivers, or microcontroller I/O pins rated for 30 V to 40 V absolute maximum.
How does the SM15T27A's SMC package compare to a SMA or SMB TVS diode package for high-power surge protection?
The SMC (DO-214AB) package of the SM15T27A has a significantly larger die and junction area than SMA or SMB packages, enabling the 1500 W peak pulse rating. An equivalent SMA TVS diode is typically rated for only 400 W to 600 W, while SMB handles 600 W to 1000 W. When a 24 V line is exposed to high-energy industrial surges exceeding 1 kW, the SM15T27A in an SMC package is the preferred choice to avoid thermal runaway or catastrophic failure under repeated stress.
Can the SM15T27A be used in a bidirectional protection circuit or is it limited to unidirectional applications?
The SM15T27A is a unidirectional TVS diode, meaning it conducts in one polarity (forward bias) at the standard silicon diode drop of approximately 0.7 V and clamps in the reverse direction at 27 V nominal. For AC lines or signals that can swing both positive and negative, a bidirectional TVS variant such as the SM15T27CA is required. The unidirectional SM15T27A is the correct choice for single-polarity 24 V DC supply rails where only positive transients above the nominal bus voltage need clamping.
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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 |
|---|---|---|
| 1+ | $0.3500 | $0.35 |
| 100+ | $0.2980 | $29.80 |
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