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STMicroelectronics SM15T27A
- Part No.:
- SM15T27A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T27A.pdf
- Description:
- TVS DIODE 23.1VWM 48.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,387
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Product details
Overview
SM15T27A from STMicroelectronics is a unidirectional 1500 W transient voltage suppression diode in SMC package, with 27 V breakdown voltage (VBR = 23.1–28.4 V), 37.5 V clamping voltage at 1 A (VCL), and 40 Ω dynamic resistance - designed for IEC 61000-4-2 ESD (30 kV air/contact) and IEC 61000-4-4 surge (4 kV level 4) protection in DC power rails of industrial SMPS and telecom interfaces.
For engineers reviewing the SM15T27A datasheet, SM15T27A pinout, SM15T27A application, or SM15T27A equivalent, key selection criteria include its 0.2 µA max leakage at 25 °C, 150 °C junction temperature rating, 10/1000 µs pulse capability, and SMC footprint compatibility with IPC7531 and JEDEC MO-213AB standards.
Technical Context
The SM15T27A employs planar silicon avalanche technology to deliver precise, repeatable clamping under fast transients. Its unidirectional polarity enables asymmetric protection on positive-rail applications, while low dynamic resistance (RD = 0.228 Ω) ensures minimal voltage overshoot during 8/20 µs surges up to 48.3 A.
Thermal performance is optimized for high-reliability operation: Rth(j-a) drops to ~40 °C/W with 3 cm² copper area per lead, and peak pulse power de-rates linearly from 1500 W at 25 °C to 1250 W at Tj = 150 °C per 10/1000 µs waveform.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 23.1 / 25.7 / 28.4 V - defines minimum voltage at which avalanche conduction begins reliably at 1 mA, ensuring robust overvoltage threshold margin |
| VCL @ IPP = 1 A | 37.5 V - maximum clamped voltage seen by protected circuit during 10/1000 µs surge, limiting stress on downstream components |
| IPP (8/20 µs) | 48.3 A - peak surge current the device safely clamps without failure, supporting IEC 61000-4-4 level 4 immunity |
| RD | 0.228 Ω - dynamic resistance governing VCL rise vs. current; lower value improves clamping precision under high-current transients |
| IR @ VRM | 0.2 µA max at 25 °C - ultra-low leakage preserves efficiency in high-impedance sensing or battery-backed circuits |
| Tj max | 150 °C - enables continuous operation in thermally constrained enclosures such as sealed power supplies or outdoor base stations |
Pinout & Package
SM15T27A is housed in an SMC (DO-214AB) surface-mount package per JEDEC MO-213AB, with 2 terminals: Cathode (marked end) and Anode. The package features matte tin-plated leads, complies with J-STD-020 MSL Level 1, and uses IPC7531-recommended footprint (8.19 × 5.11 mm pad layout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage events |
| Anode | Reference/ground return | Typically tied to system ground or low-side reference; completes clamping path for unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | 30 kV contact & air discharge - exceeds level 4, eliminating need for external ESD staging in front-end interfaces |
| Low leakage current | 0.2 µA max at 25 °C - minimizes standby power loss and avoids false triggering in high-impedance signal paths |
| High-temperature reliability | Rated for continuous operation up to 150 °C junction temperature - supports designs in sealed, convection-limited environments |
| Planar silicon construction | Enables tight VBR tolerance (±5%) and stable RD across temperature - critical for predictable clamping in wide-temp applications |
Applications
| Industrial SMPS Input Protection | Telecom Line Interface |
|---|---|
Use Scenario: 24 V DC input rail of DIN-rail mounted switch-mode power supply exposed to lightning-induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between +24 V and GND to clamp transients before they reach primary-side controller ICs. Use Value: Clamps 4 kV IEC 61000-4-4 surges to ≤37.5 V, preventing latch-up or gate oxide damage in MOSFET drivers and PWM controllers. | Use Scenario: RS-485 data line termination in outdoor cellular backhaul equipment subject to induced surges from nearby AC mains or antenna coupling. IC Role / Device Role / Timing Role: Standoff protection device on the VCC rail feeding isolated RS-485 transceivers, absorbing common-mode energy coupled onto power domain. Use Value: Limits rail excursion to <40 V during 8/20 µs transients, preserving isolation barrier integrity and avoiding transceiver reset or latch-up. |
| Automotive Body Control Module | Medical Diagnostic Equipment Power Entry |
Use Scenario: 12 V battery-supplied body control module (BCM) subjected to load-dump and ISO 7637-2 pulse 5a transients in vehicle harnesses. IC Role / Device Role / Timing Role: Primary clamping device on main 12 V input, coordinated with upstream fuse and downstream L-C filter. Use Value: Handles 1500 W 10/1000 µs pulses without degradation, maintaining <40 V rail clamping to protect microcontroller I/O and CAN transceivers. | Use Scenario: AC/DC adapter input stage of portable ultrasound imaging unit requiring Class II medical safety certification and low EMI. IC Role / Device Role / Timing Role: Secondary-stage TVS on DC output rail, suppressing switching noise and ESD from user-accessible connectors. Use Value: 0.2 µA leakage prevents capacitor discharge drift in precision analog front-end; 30 kV ESD rating eliminates need for additional polymer ESD arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ27A (Bourns) | Same SMC package, but 600 W rating (vs. 1500 W); VCL = 43.5 V @ 13.3 A | Limited to lower-energy surges; insufficient for IEC 61000-4-4 level 4 in high-impedance lines | Select only if system-level testing confirms 600 W clamping margin is sufficient and thermal derating allows |
| P6SMB27A (Littelfuse) | Identical 1500 W rating and VBR range, but higher leakage (1 µA) and wider VCL tolerance (40.5 V max) | Acceptable where leakage sensitivity is low and clamping voltage margin >3 V is available | Prefer when cost is prioritized and design tolerates 3 V higher clamping voltage |
Compared with SMBJ27A and P6SMB27A, SM15T27A delivers superior surge handling (1500 W), tighter clamping (37.5 V), and lowest leakage (0.2 µA), making it optimal for high-reliability, thermally constrained, or low-power applications demanding strict voltage control.
Availability
SM15T27A is available at Aetrix Electronics and suitable for industrial SMPS input protection, telecom line interface hardening, and automotive body control modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SM15T27A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and protection components for industrial, automotive, and consumer markets.
The SM15T series belongs to ST's high-power TVS diode product line, engineered specifically for robust, low-leakage transient suppression in space-constrained, high-temperature power systems such as server PSUs and 5G infrastructure.
FAQ
What is the maximum clamping voltage of SM15T27A under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SM15T27A under a 10/1000 µs surge is 37.5 V at 1 A peak current, as specified in Table 2 of DS0683 Rev 8. This value is measured at Tamb = 25 °C and represents the upper bound of voltage imposed on the protected circuit during standardized surge events.
Is SM15T27A RoHS-compliant and halogen-free?
Yes, SM15T27A is manufactured in STMicroelectronics' ECOPACK2-compliant SMC package, meeting RoHS Directive 2011/65/EU and being halogen-free per IEC 61249-2-21. It carries the "E2" environmental grade marking and conforms to J-STD-020 MSL Level 1 for moisture sensitivity.
Can SM15T27A be used in bidirectional signal line protection?
No - SM15T27A is unidirectional (denoted by "A" suffix) and must be used only on positive-rail-to-ground configurations. For bidirectional protection (e.g., data lines), the SM15T27CA variant is required, which provides symmetrical clamping in both polarities and is marked with "BEP" per Table 6.
What is the recommended PCB footprint for SM15T27A?
The recommended footprint follows IPC7531 and JEDEC MO-213AB standards: pad length 8.19 mm, pad width 5.11 mm, center-to-center terminal spacing 7.75–8.15 mm, and copper area ≥3.14 cm² per lead. Figure 14 in DS0683 Rev 8 provides exact dimensions in millimeters and inches.
SM15T27A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 48.3V
- Current - Peak Pulse (10/1000µs):
- 207A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM15T27A FAQ
1.How can I place an order for SM15T27A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T27A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SM15T27A reliable?
The price and inventory of SM15T27A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T27A is usually 5 days.
3.What payment methods are accepted for SM15T27A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T27A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T27A?
SM15T27A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T27A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SM15T27A?
For technical support, including SM15T27A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T27A requirements.
6.How does Aetrix verify that SM15T27A is sourced from the original manufacturer or authorized distributors?
All SM15T27A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SM15T27A meets industry standards.
7.What is the process for return or replacement of SM15T27A?
All SM15T27A units undergo pre-shipment inspection (PSI). If there is an issue with SM15T27A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SM15T27A part is unused and in its original packaging.
Return procedure for SM15T27A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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