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Vishay General Semiconductor - Diodes Division SM6T18CAHE3_B/I
- Part No.:
- SM6T18CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CAHE3_B/I.pdf
- Description:
- 600W,18V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,367
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Product details
Overview
SM6T18CAHE3_B/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 18 V standoff voltage (VWM), 21.2 V minimum breakdown voltage (VBR), and 600 W peak pulse power (10/1000 μs). It clamps transients to ≤32.5 V at 123 A IPPM and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SM6T18CAHE3_B/I datasheet, SM6T18CAHE3_B/I pinout, SM6T18CAHE3_B/I application, or SM6T18CAHE3_B/I equivalent, key selection factors include bidirectional clamping symmetry, low clamping ratio (VC/VBR ≈ 1.54), AEC-Q101 qualification status, SMB thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
The SM6T18CAHE3_B/I implements a glass-passivated silicon junction optimized for fast response (<1 ns) to ESD and lightning-induced transients. Its bidirectional structure enables symmetrical clamping in both polarities without external polarity management.
It operates across -65 °C to +150 °C junction temperature range, with thermal resistance of 20 °C/W (junction-to-lead) and 100 °C/W (junction-to-ambient), and meets J-STD-020 MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min) | 21.2 V - Minimum breakdown voltage at 1.0 mA test current; ensures reliable turn-on above normal operating voltage |
| VC @ IPPM | 32.5 V - Clamped voltage at 123 A peak pulse current (10/1000 μs); defines worst-case overvoltage seen by protected circuit |
| PPPM | 600 W - Peak pulse power handling capability under standardized surge waveform; determines robustness against IEC 61000-4-5 surges |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance; enables direct PCB copper pad heat sinking without heatsink |
| TJ max | +150 °C - Maximum allowable junction temperature; supports operation in under-hood automotive environments |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional device with no polarity marking; matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional transient conduction path | No functional distinction between terminals; identical clamping behavior in either direction |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 (4 kV) surge events when properly mounted on 5.0 mm × 5.0 mm copper pads |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD (HBM ≥ 8 kV) |
| Low clamping ratio (VC/VBR ≈ 1.54) | Minimizes overvoltage stress on downstream ICs such as CAN transceivers or sensor signal conditioning stages |
| MSL Level 1 moisture sensitivity | Enables standard reflow assembly without dry-pack or baking requirements |
| Glass passivated junction | Ensures stable leakage performance (<1.0 μA at VWM) and long-term stability under humidity and thermal stress |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Primary bidirectional clamping device placed at board-level input filter stage. Use Value: Limits transient voltage to ≤32.5 V during 123 A surges, preventing damage to downstream DC-DC converters and microcontrollers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) TVS placed directly at connector interface. Use Value: Maintains signal integrity with sub-nanosecond response while clamping ±32.5 V transients without affecting 0–5 V sensor range. |
| Telecom Data Line Surge Suppression | Consumer USB Port ESD Protection |
Use Scenario: Safeguarding RS-485 transceivers in outdoor telecom cabinets exposed to induced lightning surges. IC Role / Device Role / Timing Role: Secondary-level protection coordinated with GDT or polymer PTC upstream. Use Value: Provides precise clamping at 32.5 V to prevent latch-up in half-duplex transceivers operating up to ±12 V common-mode range. |
Use Scenario: ESD protection for USB 2.0 D+/D− lines in portable audio devices per IEC 61000-4-2 Level 4 (±15 kV contact). IC Role / Device Role / Timing Role: Bidirectional TVS integrated into USB connector footprint with minimal trace length. Use Value: Delivers <1 ns response and <1.0 μA leakage at 18 V, ensuring no impact on high-speed data eye diagram or VBUS detection logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Same VWM (18 V), lower PPPM (400 W), higher VC (35.5 V at 98 A), non-AEC-Q101 | Limited to commercial-grade industrial or consumer use; not qualified for automotive under-hood deployment | Select SMAJ18CA only for cost-sensitive, non-automotive designs where 400 W surge margin suffices |
| 1.5KE18CA | Higher VWM (18 V), same bidirectionality, but through-hole DO-15 package, 1500 W PPPM, slower response due to higher inductance | Requires PCB real estate for axial lead mounting; unsuitable for high-density SMT layouts or automated assembly | Choose 1.5KE18CA only for legacy through-hole systems or where higher single-pulse energy absorption is prioritized over board space and speed |
Compared with SMAJ18CA and 1.5KE18CA, SM6T18CAHE3_B/I uniquely combines AEC-Q101 qualification, SMB SMT footprint, 600 W surge rating, and low-inductance clamping-making it the preferred choice for new automotive and high-reliability industrial designs requiring validated production readiness.
Availability
SM6T18CAHE3_B/I is available at Aetrix Electronics and suitable for automotive control units, industrial sensor interfaces, telecom data line protection, and consumer USB port ESD hardening requiring stable component supply and full AEC-Q101 traceability.
Supply support for SM6T18CAHE3_B/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 automotive-grade validation.
The SM6T Series was engineered specifically for robust, surface-mount transient suppression in harsh environments-targeting automotive power nets, industrial I/O, and telecom infrastructure where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What does the "CA" suffix indicate in SM6T18CAHE3_B/I?
The "CA" suffix in SM6T18CAHE3_B/I denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage clamping in both forward and reverse directions. This eliminates the need for polarity-aware layout and makes it ideal for AC-coupled or differential signal lines such as RS-485, CAN bus, or USB D+/D−. Unlike unidirectional variants (e.g., SM6T18A), SM6T18CAHE3_B/I has no cathode marking and functions identically regardless of terminal orientation.
Is SM6T18CAHE3_B/I suitable for automotive under-hood applications?
Yes, SM6T18CAHE3_B/I is AEC-Q101 qualified and rated for junction temperatures up to +150 °C, making it suitable for under-hood automotive applications including engine control modules, body control units, and ADAS sensor interfaces. Its glass-passivated junction, MSL Level 1 reflow compatibility, and validated performance across temperature cycling and HTRB testing confirm its suitability for demanding automotive environments.
What is the maximum clamping voltage of SM6T18CAHE3_B/I under surge conditions?
The maximum clamping voltage (VC) of SM6T18CAHE3_B/I is 32.5 V when subjected to a 10/1000 μs surge waveform at its rated peak pulse current of 123 A. This value is guaranteed per the Vishay datasheet and reflects worst-case overvoltage seen by protected circuitry-critical for ensuring downstream components like 3.3 V or 5 V microcontrollers remain within absolute maximum ratings during transient events.
How does the SMB (DO-214AA) package of SM6T18CAHE3_B/I affect thermal performance?
The SMB (DO-214AA) package of SM6T18CAHE3_B/I delivers a junction-to-lead thermal resistance (RθJL) of 20 °C/W, enabling efficient heat transfer to PCB copper pads. When mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, SM6T18CAHE3_B/I sustains its 600 W peak pulse rating and maintains safe junction temperatures even during repeated surge events in compact, thermally constrained layouts.
Can SM6T18CAHE3_B/I replace SM6T18A in an existing design?
No-SM6T18CAHE3_B/I is bidirectional while SM6T18A is unidirectional, so direct replacement requires verification of circuit polarity and clamping symmetry requirements. SM6T18A has a cathode band and conducts only in reverse bias; substituting SM6T18CAHE3_B/I introduces symmetrical conduction that may disrupt DC biasing or cause unintended conduction paths. Layout and system-level validation are required before substitution.
SM6T18CAHE3_B/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T18CAHE3_B/I FAQ
1.How can I place an order for SM6T18CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CAHE3_B/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 SM6T18CAHE3_B/I reliable?
The price and inventory of SM6T18CAHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T18CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CAHE3_B/I?
SM6T18CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CAHE3_B/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 SM6T18CAHE3_B/I?
For technical support, including SM6T18CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CAHE3_B/I requirements.
6.How does Aetrix verify that SM6T18CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T18CAHE3_B/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 SM6T18CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T18CAHE3_B/I?
All SM6T18CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CAHE3_B/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 SM6T18CAHE3_B/I part is unused and in its original packaging.
Return procedure for SM6T18CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18CAHE3_B/I Tags
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