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Vishay General Semiconductor - Diodes Division SM6T18AHE3_A/I
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- Part No.:
- SM6T18AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18AHE3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,798
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Product details
Overview
SM6T18AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR) at 1 mA, 25.2 V maximum clamping voltage (VC) at 24 A peak pulse current, and 600 W peak pulse power capability with 10/1000 μs waveform - deployed in automotive sensor protection and industrial power supply input stages.
For engineers reviewing the SM6T18AHE3_A/I datasheet, SM6T18AHE3_A/I pinout, SM6T18AHE3_A/I application, or SM6T18AHE3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low-inductance SMB package, and compliance with IEC 61000-4-2/4-4/4-5 surge immunity requirements.
Technical Context
The SM6T18AHE3_A/I operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to deliver fast response (<1 ns) to ESD and surge events. Its clamping behavior is defined by a 10/1000 μs waveform test condition, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W enabling reliable operation under transient overload without thermal runaway.
Designed for surface-mount automation, it meets J-STD-020 MSL Level 1 (260 °C peak reflow), uses matte tin-plated leads compliant with JESD 22-B102, and carries AEC-Q101 qualification - confirming suitability for automotive-grade electronics where reliability under temperature cycling and mechanical stress is mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15.3 V - Maximum continuous reverse voltage before significant leakage; ensures stable operation across 12 V automotive rails. |
| VBR (Breakdown Voltage) | 17.1–18.9 V at 1 mA - Tight tolerance defines precise turn-on threshold for transient suppression. |
| VC (Clamping Voltage) | 25.2 V at 24 A (10/1000 μs) - Limits downstream voltage stress during surge, protecting 24 V-rated ICs and MOSFETs. |
| PPPM (Peak Pulse Power) | 600 W - Sustains high-energy transients per IEC 61000-4-5 Level 4 (4 kV line-to-line). |
| TJ max | 150 °C - Enables use in under-hood automotive environments and industrial enclosures without derating below 125 °C ambient. |
| Package | SMB (DO-214AA) - Low-profile, surface-mountable package with 0.220" x 0.130" footprint and J-STD-020 MSL Level 1 compatibility. |
| AEC-Q101 Qualified | Yes - Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
Pinout & Package
Package: SMB (DO-214AA), molded case with matte tin-plated leads; cathode indicated by band marking on one end; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of internal PN junction (reverse-biased during clamping) | Connected to protected line (e.g., 12 V rail); clamps to ground when overvoltage exceeds VBR. |
| Anode | Cathode of internal PN junction (connected to reference/ground) | Must be tied to system ground plane with low-inductance path to ensure effective transient shunting. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Ensures stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives. |
| 600 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 surge immunity up to 4 kV in 2 Ω source impedance configurations. |
| Low inductance layout | Minimizes voltage overshoot during fast transients (<1 ns response), critical for protecting high-speed sensor interfaces. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive temperature cycling, mechanical shock, and board-level reliability per AEC standard. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without popcorn cracking or delamination risk. |
Applications
| Automotive Sensor Protection | Industrial Power Input Stage |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp transients before they reach IC input pins. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V sensor interface ICs during 12 V system load dump events (up to 35 V, 400 ms). |
Use Scenario: Safeguarding DC-DC converter inputs in PLC modules exposed to 24 V industrial power surges and switching noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V rail upstream of input filter capacitor and regulator IC. Use Value: Limits input voltage to ≤25.2 V during 600 W transients, preserving downstream regulator integrity and reducing need for oversized input capacitors. |
| Consumer Device USB Port | Telecom Line Interface |
Use Scenario: ESD protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs and set-top boxes. IC Role / Device Role / Timing Role: Secondary clamping device after dedicated ESD array, handling higher-energy surges beyond IEC 61000-4-2 ±15 kV contact discharge. Use Value: Provides robust second-stage clamping with 25.2 V VC, preventing latch-up in USB controller ICs rated for 5.5 V absolute maximum. |
Use Scenario: Surge protection on Ethernet PHY power rails (e.g., 3.3 V bias for magnetics) in VoIP gateways and base stations. IC Role / Device Role / Timing Role: Localized clamping element on isolated DC bias lines susceptible to induced lightning surges. Use Value: Withstands 10/1000 μs surges up to 24 A while maintaining <1 μA leakage at 15.3 V, avoiding false resets in always-on telecom circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same SMB package, 18 V nominal VBR, but only commercial-grade (no AEC-Q101); RθJA = 110 °C/W vs. 100 °C/W. | Lacks automotive qualification; suitable for consumer/industrial designs without AEC compliance requirements. | Select SMAJ18A only if AEC-Q101 is not mandated and thermal margin allows for higher RθJA. |
| 1.5SMC18A | Higher-power SMC package (1500 W PPPM), same VBR range, but larger footprint (0.305" x 0.230"); no AEC-Q101 variant available. | Used where higher surge energy handling is required, but PCB space and automotive qualification are secondary concerns. | Choose 1.5SMC18A only when 600 W is insufficient and board area permits SMC footprint. |
Compared with SMAJ18A and 1.5SMC18A, the SM6T18AHE3_A/I uniquely combines AEC-Q101 qualification, SMB footprint, and 600 W rating - making it the optimal choice for space-constrained automotive and industrial applications requiring certified reliability without sacrificing surge performance.
Availability
SM6T18AHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial power supplies, consumer USB protection, and telecom line bias circuits requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SM6T18AHE3_A/I 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 application-specific optimization.
The SM6T Series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where ESD, load dump, and lightning-induced surges demand consistent, qualified clamping performance.
FAQ
What is the maximum clamping voltage of the SM6T18AHE3_A/I at its rated peak pulse current?
The SM6T18AHE3_A/I has a maximum clamping voltage (VC) of 25.2 V at 24 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SM6T18AHE3_A/I maintains this clamping performance across its full operating temperature range (–65 °C to +150 °C), ensuring predictable protection in automotive under-hood applications.
Is the SM6T18AHE3_A/I suitable for automotive applications?
Yes, the SM6T18AHE3_A/I is AEC-Q101 qualified, as confirmed by its HE3 suffix and Vishay's official documentation. It undergoes rigorous testing for temperature cycling, mechanical shock, and board-level reliability per AEC-Q101 standards. The SM6T18AHE3_A/I is explicitly recommended for automotive sensor units, body control modules, and infotainment power rails where transient immunity and long-term stability are critical.
What does the "HE3" suffix indicate in SM6T18AHE3_A/I?
The "HE3" suffix in SM6T18AHE3_A/I denotes RoHS-compliant construction and AEC-Q101 qualification. "H" identifies the AEC-Q101 grade, "E3" confirms lead-free, RoHS-compliant plating and packaging. The "_A/I" portion specifies tape-and-reel packaging: "A" is the revision code, and "I" indicates 13-inch diameter reels with 3200 units per reel - a standard configuration for automated SMT assembly.
How does the SM6T18AHE3_A/I differ from bidirectional TVS diodes like SM6T18CA?
The SM6T18AHE3_A/I is unidirectional, meaning it conducts only in reverse bias above VBR and blocks forward current - ideal for DC power line protection with defined polarity. In contrast, SM6T18CA is bidirectional and symmetrical, used for AC or data-line protection (e.g., RS-485). The SM6T18AHE3_A/I has a cathode band marking; SM6T18CA has no polarity marking. Their VBR and VC values are identical, but conduction behavior differs fundamentally.
What is the thermal resistance and power derating behavior of the SM6T18AHE3_A/I?
The SM6T18AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. Its 5.0 W steady-state power dissipation is rated at TA = 50 °C and derates linearly above that temperature - dropping to zero at 150 °C junction temperature. Derating curves per Figure 2 in Vishay document 88385 confirm usable power down to ~2.5 W at 100 °C ambient, supporting operation in sealed industrial enclosures.
SM6T18AHE3_A/I 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/I FAQ
1.How can I place an order for SM6T18AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18AHE3_A/I 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/I reliable?
The price and inventory of SM6T18AHE3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SM6T18AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18AHE3_A/I?
SM6T18AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18AHE3_A/I 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/I?
For technical support, including SM6T18AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18AHE3_A/I requirements.
6.How does Aetrix verify that SM6T18AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T18AHE3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SM6T18AHE3_A/I?
All SM6T18AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18AHE3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SM6T18AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18AHE3_A/I Tags
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