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Vishay General Semiconductor - Diodes Division SM15T27A-M3/9AT
- Part No.:
- SM15T27A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T27A-M3/9AT.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,295
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Product details
Overview
SM15T27A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, with 27 V standoff voltage (VWM = 23.1 V), 37.5 V clamping voltage at 40 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply rails against lightning-induced and switching transients.
For engineers reviewing the SM15T27A-M3/9AT datasheet, SM15T27A-M3/9AT pinout, SM15T27A-M3/9AT application, or SM15T27A-M3/9AT equivalent, key selection criteria include verified clamping performance at 40 A IPPM, unidirectional polarity with cathode band marking, halogen-free RoHS compliance (M3 suffix), and suitability for high-reliability board-level surge protection where low inductance and MSL Level 1 reflow compatibility are required.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under transient overvoltage exceeding its breakdown threshold (VBR min = 25.7 V), it avalanches to divert current away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1.0 μA at 23.1 V) and robust surge endurance.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient, with thermal resistance of 75 °C/W (junction-to-ambient) on standard 8.0 mm × 8.0 mm copper pads. It fails short-circuit under overstress - a predictable, system-safe failure mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 23.1 V - Maximum continuous reverse voltage before significant leakage; sets operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 25.7–28.4 V at 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering during transients. |
| VC (Clamping Voltage) | 37.5 V at 40 A (10/1000 μs) - Actual voltage seen by protected circuit during worst-case surge; enables safe margin for 24 V systems. |
| PPPM (Peak Pulse Power) | 1500 W - Sustained energy-handling capability for lightning and inductive-switching threats per industry-standard waveform. |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Negligible standby current; avoids loading sensitive reference or bias networks. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; supports automated placement and J-STD-020 MSL Level 1 reflow. |
| Polarity | Unidirectional - Cathode marked by band; blocks forward conduction, clamps only reverse transients - ideal for DC rail protection. |
Pinout & Package
SM15T27A-M3/9AT uses the SMC (DO-214AB) package: a molded, halogen-free, RoHS-compliant surface-mount case with matte tin-plated leads. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); thermal pad layout per Vishay spec requires 8.0 mm × 8.0 mm copper per terminal for rated IPPM.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., 24 V rail); conducts avalanche current to ground during overvoltage events. |
| Anode | Reference / return path | Typically tied to system ground; completes shunt path - must be low-inductance connection for effective clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Validated energy absorption for IEC 61000-4-5 Level 4 surges without degradation. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage across temperature and humidity stress. |
| Low inductance construction | Minimizes voltage overshoot during fast-rising transients (e.g., <100 ns edges), improving clamping fidelity. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning or dry-pack requirements. |
| Halogen-free & RoHS-compliant (M3 suffix) | Fulfills environmental compliance for automotive and industrial OEM programs without sacrificing electrical performance. |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in body control modules against load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and DC-DC input, clamping spikes within 100 ns. Use Value: Maintains system uptime by preventing latch-up or destruction of upstream regulators during ISO 16750-2 pulses up to ±100 V. |
Use Scenario: Safeguarding analog input channels (e.g., 4–20 mA loops) in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary front-end transient suppressor mounted at connector entry point, ahead of signal conditioning circuitry. Use Value: Enables >15 kV ESD and 1 kV/500 A surge immunity per IEC 61000-4-4/5 while preserving signal integrity via low capacitance (<100 pF). |
| Consumer Appliance Motor Drive Protection | Telecom Power Interface Protection |
Use Scenario: Shielding gate drivers and microcontrollers in smart HVAC blower modules from inductive kickback generated by brushed DC motors. IC Role / Device Role / Timing Role: Localized TVS on motor driver VDD rail, placed adjacent to power FETs to minimize loop inductance. Use Value: Prevents false resets and MOSFET failure by clamping transients to ≤37.5 V - well below 40 V absolute maximum ratings of common gate drivers. |
Use Scenario: Securing 48 V phantom power inputs in VoIP phones and base stations against lightning-induced surges on Ethernet or telephone lines. IC Role / Device Role / Timing Role: First-stage protector in multi-tiered architecture, absorbing bulk surge energy before secondary TVS or MOV stages. Use Value: Delivers 1500 W dissipation capacity to meet Telcordia GR-1089-CORE Level 3 requirements without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Lower PPPM (600 W), smaller SMB package (DO-214AA), VWM = 20.5 V, VC = 38.9 V @ 15.4 A | Rated for lighter-duty transients; insufficient for IEC 61000-4-5 Level 4 or automotive load dump | Select when space-constrained layouts require smaller footprint and threat level is limited to ESD or low-energy switching noise. |
| SMCJ24A | Same SMC package, higher PPPM (1500 W), but VWM = 20.5 V and VC = 38.9 V @ 38.9 A - tighter clamping margin for 24 V systems | Offers identical power rating but lower standoff; may trigger prematurely on 24 V rail ripple or cold-crank dips | Prefer when precise 24 V rail tolerance is critical and system can tolerate earlier conduction onset; verify VWM margin vs. minimum operating voltage. |
Compared with SMBJ24A and SMCJ24A, SM15T27A-M3/9AT provides optimal balance of 23.1 V standoff headroom, 37.5 V clamping ceiling, and full 1500 W surge capacity in the proven SMC outline - making it the preferred choice for 24 V industrial and automotive applications demanding both reliability and design margin.
Availability
SM15T27A-M3/9AT is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and telecom power interface designs requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified alternatives.
Supply support for SM15T27A-M3/9AT 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The SM15T Series was engineered specifically for high-energy transient suppression in harsh environments - targeting 24 V and 48 V DC systems in automotive, industrial automation, and infrastructure equipment where predictable short-circuit failure and MSL Level 1 process compatibility are mandatory.
FAQ
What is the clamping voltage of SM15T27A-M3/9AT at its rated peak pulse current?
The SM15T27A-M3/9AT has a maximum clamping voltage (VC) of 37.5 V when subjected to a 10/1000 μs waveform at 40 A peak pulse current (IPPM). This value is measured under standardized test conditions per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T27A-M3/9AT maintains this clamping performance consistently across its qualified temperature range.
Is SM15T27A-M3/9AT suitable for automotive applications?
Yes, SM15T27A-M3/9AT is halogen-free and RoHS-compliant (M3 suffix), and the SM15T family offers AEC-Q101-qualified variants (e.g., SM15T27AHM3_X). While SM15T27A-M3/9AT itself is commercial-grade, its construction - including glass-passivated junction, MSL Level 1 rating, and 150 °C TJ max - meets foundational requirements for under-hood and body electronics. For certified automotive use, specify the HM3_X variant.
How does the M3 suffix affect SM15T27A-M3/9AT's compliance and reliability?
The M3 suffix on SM15T27A-M3/9AT indicates halogen-free, RoHS-compliant materials per Vishay's specification, with whisker resistance per JESD 201 Class 2. It does not alter electrical parameters but ensures environmental compliance for export-controlled markets and enhances long-term solder joint reliability in high-vibration environments. The SM15T27A-M3/9AT retains full 1500 W surge capability and thermal performance of the base series.
What is the thermal resistance of SM15T27A-M3/9AT, and how does it impact PCB layout?
The SM15T27A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To achieve rated IPPM and avoid thermal derating, PCB layout must replicate this pad area and ensure solid thermal vias to inner ground planes. Reducing pad size increases RθJA and lowers sustainable surge repetition rate.
Does SM15T27A-M3/9AT have polarity markings, and how is it oriented on the PCB?
Yes, SM15T27A-M3/9AT is unidirectional and features a cathode band marking on the SMC (DO-214AB) package body. During PCB layout, the banded end must connect to the line being protected (e.g., 24 V rail), while the anode connects to ground. Incorrect orientation renders the device non-functional for reverse transients and may cause catastrophic failure under overvoltage.
SM15T27A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TransZorb®
- 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:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SM15T27A-M3/9AT FAQ
1.How can I place an order for SM15T27A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T27A-M3/9AT 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-M3/9AT reliable?
The price and inventory of SM15T27A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T27A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T27A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T27A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T27A-M3/9AT?
SM15T27A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T27A-M3/9AT 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-M3/9AT?
For technical support, including SM15T27A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T27A-M3/9AT requirements.
6.How does Aetrix verify that SM15T27A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T27A-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T27A-M3/9AT?
All SM15T27A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T27A-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SM15T27A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T27A-M3/9AT Tags
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