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Vishay General Semiconductor - Diodes Division SM15T18AHE3_A/H
- Part No.:
- SM15T18AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18AHE3_A/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SM15T18AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR), and 25.2 V clamping voltage (VC) at 59.5 A peak pulse current - used to protect MOSFETs, ICs, and sensor signal lines in automotive power systems against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T18AHE3_A/H datasheet, SM15T18AHE3_A/H pinout, SM15T18AHE3_A/H application, or SM15T18AHE3_A/H equivalent, key selection criteria include verified clamping performance at 59.5 A IPPM, AEC-Q101 qualification status, unidirectional polarity with cathode band marking, and thermal resistance (RθJA = 75 °C/W) under standard 8.0 mm × 8.0 mm copper pad layout.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 15.3 V, it avalanches at VBR = 17.1–18.9 V (IT = 1.0 mA), limiting transient voltage to ≤25.2 V at IPPM = 59.5 A (10/1000 μs). Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and low inductance for fast response.
Designed for high-reliability automotive applications, SM15T18AHE3_A/H meets AEC-Q101 qualification (HE3 suffix), supports 200 A non-repetitive forward surge (IFSM), and sustains operation from –65 °C to +150 °C junction temperature. Its SMC package enables automated placement and complies with MSL level 1 (260 °C peak reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 1500 W - withstands lightning-induced surges on power/signal lines without failure |
| Stand-off Voltage VWM | 15.3 V - blocks normal operating voltage while remaining inactive below this threshold |
| Breakdown Voltage VBR | 17.1–18.9 V at 1.0 mA - precise avalanche initiation point for predictable clamping onset |
| Clamping Voltage VC | 25.2 V at 59.5 A - limits transient voltage seen by protected downstream components |
| Peak Pulse Current IPPM | 59.5 A - maximum surge current handled without degradation under defined waveform |
| Junction Temperature Range | –65 °C to +150 °C - supports under-hood automotive environments and industrial thermal cycling |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability per stress test requirements |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end; compliant with UL 94 V-0 flammability rating and J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink during reverse overvoltage | Connected to protected line; conducts avalanche current to ground when VREV > VBR |
| Anode (unmarked end) | Reference/return path for clamping current | Typically tied to system ground or low-impedance return plane to complete protection loop |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV) surges without derating in standard PCB layout |
| Glass passivated junction | Ensures stable VBR tolerance (±5%) and <1.0 μA leakage at VWM, critical for low-power sensor interfaces |
| AEC-Q101 qualification (HE3) | Validates reliability for automotive powertrain, body control, and ADAS modules requiring zero-failure field performance |
| Low inductance SMC package | Minimizes voltage overshoot during fast transients (e.g., <100 ns rise time), improving clamping fidelity |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C), simplifying SMT manufacturing |
Applications
| Automotive Power Distribution | Industrial Motor Drive Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rail to clamp positive-going surges before they reach DC-DC converters and microcontrollers. Use Value: Clamps to 25.2 V at 59.5 A, preventing damage to 3.3 V/5 V logic supplies and ensuring ASIL-B compliance in BCU designs. |
Use Scenario: Safeguarding gate drivers and current-sense amplifiers in variable-frequency drives exposed to coil turn-off spikes. IC Role / Device Role / Timing Role: Shunt protector on motor-phase signal lines and auxiliary power rails to suppress inductive kickback. Use Value: 1500 W rating handles repetitive 10/1000 μs transients up to 59.5 A without degradation, extending system uptime. |
| Automotive Sensor Signal Lines | Telecom Power Interface |
|
Use Scenario: Shielding LIN/CAN transceiver I/O pins and analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) unidirectional TVS placed at connector entry point to limit voltage before signal conditioning circuitry. Use Value: Tight VBR tolerance (17.1–18.9 V) ensures early conduction before sensitive 24 V-rated op-amps exceed absolute max ratings. |
Use Scenario: Protecting PoE-powered equipment front-end circuits from induced surges on Ethernet data pairs and DC input lines. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input and differential signal paths to meet IEC 61000-4-4/5 immunity requirements. Use Value: AEC-Q101 qualification and 1500 W capability provide margin beyond telecom surge standards, reducing need for secondary protection stages. |
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 | Same SMC package, 1500 W rating, but VWM = 15.3 V, VC = 29.2 V at 51.7 A - higher clamping voltage and lower IPPM | Lacks AEC-Q101 qualification; suited for commercial/industrial use only | Select when AEC-Q101 is not required and higher clamping voltage is acceptable for protected IC VMAX |
| SMCJ18AHE3_A/H | Same AEC-Q101 qualification and HE3 suffix, but 3000 W rating, VC = 29.2 V at 103 A - double peak power with same VWM/VBR | Targeted at higher-energy threat environments (e.g., heavy-duty vehicle alternators, railway systems) | Choose when system-level surge testing exceeds 1500 W requirements or long-term reliability under repeated stress is critical |
Compared with SMAJ18A-E3/57T, SM15T18AHE3_A/H delivers tighter clamping (25.2 V vs. 29.2 V) and automotive qualification; versus SMCJ18AHE3_A/H, it offers lower clamping voltage and reduced board area cost where 1500 W suffices.
Availability
SM15T18AHE3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive protection, and sensor interface applications requiring stable component supply, AEC-Q101 validation, and consistent 1500 W transient handling.
Supply support for SM15T18AHE3_A/H 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, efficiency, and automotive-grade qualification.
The SM15T Series was developed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 compliance and 1500 W surge capability are mandatory design requirements.
FAQ
What is the clamping voltage of SM15T18AHE3_A/H at its rated peak pulse current?
The SM15T18AHE3_A/H has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current of 59.5 A under the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T18AHE3_A/H maintains this clamping performance across its qualified operating temperature range.
Is SM15T18AHE3_A/H qualified for automotive applications?
Yes, SM15T18AHE3_A/H is AEC-Q101 qualified, as confirmed by its HE3 suffix and explicit listing in Vishay's qualified product documentation. It undergoes stress testing including temperature cycling, humidity bias HAST, and mechanical shock to meet automotive reliability requirements. The SM15T18AHE3_A/H is intended for use in engine control units, body electronics, and ADAS modules where zero-failure field performance is mandated.
What does the "A/H" suffix mean in SM15T18AHE3_A/H?
The "A/H" suffix in SM15T18AHE3_A/H indicates packaging configuration: "A" denotes the base device type (unidirectional TVS), and "H" specifies the preferred package code for 7-inch diameter plastic tape and reel delivery, with a base quantity of 850 units. This matches Vishay's ordering information table in document 88380 and distinguishes it from alternate reels (e.g., "I" for 13-inch reels). The SM15T18AHE3_A/H is RoHS-compliant and AEC-Q101 qualified.
How does SM15T18AHE3_A/H differ from bidirectional variants like SM15T18CA?
SM15T18AHE3_A/H is unidirectional, with polarity marked by a cathode band and designed to clamp only reverse-voltage transients; SM15T18CA is bidirectional, symmetrical in both directions, and lacks polarity marking. Their VBR and VC values differ: SM15T18CA has VBR = 17.1–18.9 V in both directions but higher VC due to dual-junction architecture. The SM15T18AHE3_A/H is selected when protection is needed only on the positive rail relative to ground.
What is the thermal resistance of SM15T18AHE3_A/H, and how does it affect layout?
The SM15T18AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in Vishay document 88380. This value assumes minimum recommended pad layout; reducing pad size increases RθJA, risking thermal runaway during repetitive surges. Layout must replicate the 8.0 mm × 8.0 mm copper area for each terminal to ensure the SM15T18AHE3_A/H meets its 150 °C TJ rating.
SM15T18AHE3_A/H 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):
- 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_A/H FAQ
1.How can I place an order for SM15T18AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18AHE3_A/H 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_A/H reliable?
The price and inventory of SM15T18AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SM15T18AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18AHE3_A/H?
SM15T18AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18AHE3_A/H 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_A/H?
For technical support, including SM15T18AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18AHE3_A/H requirements.
6.How does Aetrix verify that SM15T18AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SM15T18AHE3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SM15T18AHE3_A/H?
All SM15T18AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18AHE3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SM15T18AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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