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Vishay General Semiconductor - Diodes Division SM15T18AHE3/9AT
- Part No.:
- SM15T18AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18AHE3/9AT.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,983
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Product details
Overview
SM15T18AHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features 18 V stand-off voltage (VWM), 25.2 V maximum clamping voltage at 59.5 A peak pulse current (10/1000 μs), and 1500 W peak pulse power rating. Used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems against lightning-induced and switching transients.
For engineers reviewing the SM15T18AHE3/9AT datasheet, SM15T18AHE3/9AT pinout, SM15T18AHE3/9AT application, or SM15T18AHE3/9AT equivalent, key selection criteria include clamping performance under 10/1000 μs threat waveforms, AEC-Q101 qualification status, unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SM15T18AHE3/9AT operates as a silicon avalanche diode with glass-passivated junction, delivering precise voltage clamping during transient events. Its breakdown voltage (VBR) is specified at 17.1–18.9 V (min/max) with 1.0 mA test current, and it maintains low dynamic impedance to ensure stable clamping up to 59.5 A IPPM.
Thermal design relies on RθJL = 15 °C/W (junction-to-lead) and RθJA = 75 °C/W (junction-to-ambient), requiring minimum pad layout per JEDEC MO-213. The device fails short-circuit under overstress and meets MSL Level 1 (260 °C peak reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15.3 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (Breakdown Voltage) | 17.1–18.9 V at 1.0 mA - Ensures reliable avalanche initiation within defined tolerance band |
| VC (Clamping Voltage) | 25.2 V at 59.5 A (10/1000 μs) - Limits downstream voltage stress during surge events |
| PPPM (Peak Pulse Power) | 1500 W - Supports protection against lightning-induced surges per IEC 61000-4-5 |
| IFSM (Surge Current) | 200 A (10 ms half-sine) - Withstands repetitive inductive turn-off spikes without degradation |
| TJ max | 150 °C - Enables operation in under-hood automotive environments and industrial enclosures |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 0.320" body length and matte tin leads |
Pinout & Package
SM15T18AHE3/9AT uses the SMC (DO-214AB) package: molded epoxy case meeting UL 94 V-0, matte tin-plated leads solderable per J-STD-002, and polarity indicated by cathode band on unidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to ground or low-side reference in unidirectional TVS configurations |
| Cathode | Current exit terminal in forward bias; marked with band | Connected to protected line (e.g., 12 V rail or CAN_H) to clamp positive transients |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges without derating in standard PCB layouts |
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics applications requiring zero defect reliability |
| Glass passivated junction | Provides stable VBR over temperature and long-term reliability under humidity and thermal cycling |
| Low inductance structure | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time) |
| MSL Level 1 (260 °C) | Supports standard lead-free reflow profiles without preconditioning or baking |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive surges. Use Value: Clamps to 25.2 V at 59.5 A, preventing damage to downstream LDOs and microcontrollers rated for ≤36 V absolute maximum. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in PLC modules. IC Role / Device Role / Timing Role: Low-capacitance TVS on 4–20 mA or 0–10 V signal paths to suppress EFT bursts. Use Value: Maintains signal integrity with <100 pF junction capacitance and sub-10 ns response time. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding PoE-powered switches and base stations against induced lightning surges. IC Role / Device Role / Timing Role: Primary-level TVS on -48 V DC input rails upstream of DC/DC converters. Use Value: Handles 1500 W pulses without thermal runaway, validated per Telcordia GR-1089-CORE. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Snubber-connected across motor terminals to limit voltage reversal during commutation. Use Value: Withstands 200 A IFSM surges and operates continuously at TJ = 150 °C near motor windings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T | 600 W PPPM, SMA package, lower IPPM (27.5 A), same VWM/VBR range | Limited to lower-energy threats (IEC 61000-4-4); unsuitable for lightning-level surges | Select when board space is constrained and surge threat level is ≤Level 3 |
| SMCJ18AHE3/9AT | Same SMC package and AEC-Q101 qualification, but 3000 W PPPM and higher VC (29.2 V @ 103 A) | Better suited for harsher environments (e.g., commercial vehicle alternators), but higher clamping voltage | Choose when system margin allows >29 V clamping and higher surge immunity is mandatory |
Compared with SMAJ18A-E3/57T, SM15T18AHE3/9AT delivers 2.5× higher surge energy handling in identical footprint; versus SMCJ18AHE3/9AT, it trades 1500 W capability for tighter clamping (25.2 V vs. 29.2 V), making it optimal for voltage-sensitive 12 V logic rails.
Availability
SM15T18AHE3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer appliance motor controls requiring stable component supply and AEC-Q101 compliance.
Supply support for SM15T18AHE3/9AT 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 efficiency, and automotive-grade qualification.
The SM15T Series was engineered specifically for high-power transient suppression in automotive and industrial environments, balancing low clamping voltage, high surge capability, and AEC-Q101 validation for mission-critical systems.
FAQ
What is the clamping voltage of SM15T18AHE3/9AT at its rated peak pulse current?
The SM15T18AHE3/9AT has a maximum clamping voltage (VC) of 25.2 V when subjected to a 10/1000 μs waveform at 59.5 A peak pulse current (IPPM). This value is measured under standardized test conditions with 0.31" × 0.31" copper pads and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T18AHE3/9AT maintains this clamping performance across its operational temperature range.
Is SM15T18AHE3/9AT qualified for automotive applications?
Yes, SM15T18AHE3/9AT is AEC-Q101 qualified, as confirmed by the "HE3" suffix in its ordering code. It undergoes stress testing including temperature cycling, humidity bias, and mechanical shock per AEC-Q101 Rev D requirements. The SM15T18AHE3/9AT is approved for use in automotive body electronics, infotainment power supplies, and engine control module interfaces where transient immunity and long-term reliability are critical.
How does the SM15T18AHE3/9AT differ from bidirectional TVS diodes like SM15T18CA?
The SM15T18AHE3/9AT is unidirectional and features a cathode band marking; it conducts only during positive transients relative to its anode. In contrast, SM15T18CA is bidirectional with symmetrical clamping in both polarities and no polarity marking. The SM15T18AHE3/9AT offers lower leakage current and tighter VBR tolerance in single-polarity applications such as DC power rail protection, whereas SM15T18CA suits AC-coupled or differential signal lines.
What is the thermal resistance of SM15T18AHE3/9AT, and how does it affect PCB layout?
The SM15T18AHE3/9AT has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" copper pads. To maintain safe operating temperature under repeated surges, PCB layout must follow the recommended pad dimensions and avoid thermal isolation. The SM15T18AHE3/9AT requires adequate copper area for heat dissipation, especially in high-duty-cycle applications like motor drive snubbing.
Can SM15T18AHE3/9AT be used in place of older SMAJ18A parts?
No - SM15T18AHE3/9AT is not a drop-in replacement for SMAJ18A due to different package (SMC vs. SMA), higher power rating (1500 W vs. 600 W), and distinct thermal characteristics. While both share VWM = 15.3 V and similar VBR, the SM15T18AHE3/9AT requires larger PCB pads and delivers significantly higher surge current capability. Replacing SMAJ18A with SM15T18AHE3/9AT necessitates layout revision and thermal validation.
SM15T18AHE3/9AT 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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 59.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SM15T18AHE3/9AT FAQ
1.How can I place an order for SM15T18AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18AHE3/9AT 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 SM15T18AHE3/9AT reliable?
The price and inventory of SM15T18AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T18AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18AHE3/9AT?
SM15T18AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18AHE3/9AT 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 SM15T18AHE3/9AT?
For technical support, including SM15T18AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18AHE3/9AT requirements.
6.How does Aetrix verify that SM15T18AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T18AHE3/9AT 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 SM15T18AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T18AHE3/9AT?
All SM15T18AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18AHE3/9AT, 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 SM15T18AHE3/9AT part is unused and in its original packaging.
Return procedure for SM15T18AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18AHE3/9AT Tags
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