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Vishay General Semiconductor - Diodes Division SM6T18AHE3_A/H
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- Part No.:
- SM6T18AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18AHE3_A/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,939
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Product details
Overview
SM6T18AHE3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 18 V standoff voltage (VWM = 15.3 V), 25.2 V clamping voltage at 24 A peak pulse current, and 600 W peak pulse power with 10/1000 μs waveform. It provides robust ESD and surge protection for automotive sensor signal lines and MOSFET gate drivers.
For engineers reviewing the SM6T18AHE3_A/H datasheet, SM6T18AHE3_A/H pinout, SM6T18AHE3_A/H application, or SM6T18AHE3_A/H equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, junction temperature derating above 25 °C, AEC-Q101 qualification status, and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This TVS operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its breakdown threshold (VBR = 17.1–18.9 V at 1 mA). Its low-inductance SMB package enables fast response (<1 ns) to transients induced by inductive load switching or ESD events.
Designed for automotive-grade reliability, SM6T18AHE3_A/H meets AEC-Q101 qualification, features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is rated for operation from −65 °C to +150 °C junction temperature with MSL Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system signal or supply rail voltage. |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Confirmed avalanche breakdown range; ensures predictable turn-on behavior across production lot. |
| VC @ IPPM | 25.2 V at 24 A (10/1000 μs) - Clamping voltage during worst-case surge; defines maximum stress on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; validated per Fig. 1 with 0.2" × 0.2" copper pads per terminal. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; requires minimum recommended pad layout to maintain safe TJ ≤ 150 °C. |
| IFSM | 100 A - Non-repetitive forward surge rating (10 ms half-sine); supports protection against high-energy inductive kickback. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments with proper thermal design. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VREV > VBR. |
| Anode (unmarked end) | Reference node | Typically tied to system ground or lowest potential reference; completes clamping path during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces. |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity exposure. |
| Low inductance SMB package | Minimizes voltage overshoot during fast transients (e.g., ISO 7637-2 pulse 1/2a/5a), critical for protecting high-speed signal lines. |
| 600 W peak pulse power | Withstands automotive load-dump surges and inductive switching spikes without degradation when mounted per spec. |
| MSL Level 1, 260 °C reflow compatible | Enables standard SMT assembly without pre-baking; supports high-volume automated placement. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Gate Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine bay modules exposed to ISO 16750-2 load dump and jump-start transients. IC Role / Device Role: Unidirectional TVS placed between sensor output and microcontroller ADC input, referenced to chassis ground. Use Value: Limits voltage seen by MCU input to ≤25.2 V during 24 A surge, preventing latch-up or permanent damage while maintaining signal integrity below VWM = 15.3 V. | Use Scenario: Safeguarding gate terminals of N-channel MOSFETs in BLDC motor inverters subject to Miller-induced voltage spikes during high dV/dt switching. IC Role / Device Role: TVS connected cathode-to-gate, anode-to-source, clamping gate-source voltage during turn-off oscillation. Use Value: Prevents gate oxide rupture by limiting VGS to ≤25.2 V, enabling reliable operation at 20 kHz PWM with 100 V bus voltage. |
| Telecom Line Interface Protection | Consumer Power Supply Input Clamp |
Use Scenario: Shielding RS-485 transceiver inputs in outdoor base station equipment from lightning-induced surges on twisted-pair cabling. IC Role / Device Role: Unidirectional TVS installed on each differential line (A/B) with cathode toward positive rail, referenced to local ground plane. Use Value: Clamps common-mode transients to ≤25.2 V within 1 ns, preserving data integrity up to 10 Mbps while surviving 600 W pulses per IEC 61000-4-5. | Use Scenario: Suppressing inrush and switching transients on 12 V DC input rails of smart home hubs powered from wall adapters. IC Role / Device Role: TVS placed between input rail and ground, upstream of bulk capacitor and LDO regulator. Use Value: Absorbs 10/1000 μs surges up to 24 A without failure, ensuring stable 12 V supply to SoC and wireless radios during adapter plug/unplug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same VWM (15.3 V) and VC (25.2 V), but lower PPPM = 400 W; SMA package (larger RθJA = 125 °C/W). | Not AEC-Q101 qualified; suitable for commercial-grade consumer or industrial designs where automotive qualification is not required. | Select SMAJ18A only if cost sensitivity outweighs automotive compliance and higher surge margin. |
| SMCJ18A | Higher PPPM = 1500 W, same VWM/VC, but larger SMC package (DO-214AB); RθJA = 15 °C/W with heatsink. | Used where sustained surge energy exceeds 600 W capability-e.g., main DC input protection in EV charging stations. | Choose SMCJ18A when system-level surge testing requires >600 W margin or when board space allows larger footprint. |
Compared with SMAJ18A and SMCJ18A, SM6T18AHE3_A/H delivers AEC-Q101 qualification and optimized 600 W surge handling in the smallest SMB footprint, making it ideal for space-constrained automotive modules where both reliability and size matter.
Availability
SM6T18AHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial motor drive gate protection, and telecom line interface protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SM6T18AHE3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade performance.
The SM6T Series is designed specifically for surface-mount transient voltage suppression in automotive, industrial, and telecom systems where compact size, AEC-Q101 qualification, and repeatable clamping performance are essential.
FAQ
What is the clamping voltage of SM6T18AHE3_A/H at its rated peak pulse current?
The SM6T18AHE3_A/H has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current of 24 A using the standardized 10/1000 μs waveform. This value is measured under specified test conditions per Figure 1 in the Vishay datasheet 88385 and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SM6T18AHE3_A/H qualified for automotive applications?
Yes, SM6T18AHE3_A/H is AEC-Q101 qualified, as confirmed by its HE3 suffix and explicit mention in the Vishay SM6T datasheet revision 09-Jan-2024. This qualification validates its suitability for automotive electronic systems including engine control, body electronics, and ADAS sensor modules operating across −65 °C to +150 °C.
What does the "HE3" suffix indicate in SM6T18AHE3_A/H?
The "HE3" suffix in SM6T18AHE3_A/H denotes RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering nomenclature, "HE3" identifies the automotive-grade variant with matte tin-plated leads, JESD 201 Class 2 whisker resistance, and full qualification per AEC-Q101 stress test requirements.
How does the SMB (DO-214AA) package of SM6T18AHE3_A/H affect thermal performance?
The SMB package of SM6T18AHE3_A/H delivers a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes no additional heatsinking; exceeding 5.0 W steady-state dissipation requires careful PCB layout or derating above 25 °C ambient per Figure 2 in the datasheet.
Can SM6T18AHE3_A/H be used in bidirectional configurations?
No, SM6T18AHE3_A/H is a unidirectional TVS diode, as indicated by its "A" suffix and absence of "CA" in the part number. For bidirectional operation, Vishay specifies variants like SM6T18CA; using SM6T18AHE3_A/H in reverse-biased AC signal paths would result in unintended conduction and failure.
SM6T18AHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 24A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SM6T18AHE3_A/H FAQ
1.How can I place an order for SM6T18AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18AHE3_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 SM6T18AHE3_A/H reliable?
The price and inventory of SM6T18AHE3_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 SM6T18AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SM6T18AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18AHE3_A/H?
SM6T18AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18AHE3_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 SM6T18AHE3_A/H?
For technical support, including SM6T18AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18AHE3_A/H requirements.
6.How does Aetrix verify that SM6T18AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SM6T18AHE3_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 SM6T18AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SM6T18AHE3_A/H?
All SM6T18AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18AHE3_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 SM6T18AHE3_A/H part is unused and in its original packaging.
Return procedure for SM6T18AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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