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Vishay General Semiconductor - Diodes Division SM6T18CA-E3/5B
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- Part No.:
- SM6T18CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CA-E3/5B.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,200
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Product details
Overview
SM6T18CA-E3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 18 V standoff voltage (VWM), 25.2 V maximum clamping voltage at 24 A peak pulse current (10/1000 μs), 600 W peak pulse power rating, and operates across -65 °C to +150 °C junction temperature range. It is widely used for ESD and surge protection in automotive sensor interfaces.
For engineers reviewing the SM6T18CA-E3/5B datasheet, SM6T18CA-E3/5B pinout, SM6T18CA-E3/5B application, or SM6T18CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.4), AEC-Q101 qualification readiness (via HE3 suffix variants), SMB footprint compatibility, and compliance with IEC 61000-4-2/4-5 surge immunity requirements.
Technical Context
The SM6T18CA-E3/5B implements an avalanche breakdown-based clamping mechanism optimized for fast response (<1 ns) to transient overvoltages. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
It delivers 600 W peak pulse power handling per the standardized 10/1000 μs waveform, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W, enabling reliable operation under repetitive surge conditions when mounted on 5.0 mm × 5.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 17.1 V / 18.9 V - Breakdown occurs within this range at 1 mA test current, ensuring predictable turn-on |
| VC @ IPPM | 25.2 V @ 24 A - Clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPPM | 600 W - Peak surge energy absorption capacity under standard waveform |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and industrial enclosures |
| Leakage ID | 1.0 μA @ 18 V - Minimal standby current draw, critical for battery-powered sensor nodes |
Pinout & Package
SM6T18CA-E3/5B uses the SMB (DO-214AA) surface-mount package with two terminals: anode and cathode. As a bidirectional device, it has no polarity marking; both terminals are functionally symmetric and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts during negative-going surges; forms one side of symmetrical avalanche path |
| Cathode | Transient current entry (positive half-cycle) | Conducts during positive-going surges; completes bidirectional clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines without external polarity management |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surges on 2 Ω source impedance when properly laid out |
| Low clamping ratio (VC/VWM = 1.4) | Minimizes voltage overshoot beyond protected IC's absolute maximum ratings during fast transients |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| AEC-Q101 qualification path | HE3/HM3 variants available for automotive applications requiring validated reliability and traceability |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient excursions to ≤25.2 V, preventing latch-up or gate oxide damage in 3.3 V/5 V ADC front-ends. | Use Scenario: Safeguarding CANH/CANL differential pair against ESD events and bus faults in factory automation controllers. IC Role / Device Role / Timing Role: Paired SM6T18CA-E3/5B devices placed line-to-ground on each bus wire. Use Value: Maintains signal integrity below ISO 11898-2 common-mode limits while absorbing ±15 kV contact ESD per IEC 61000-4-2. |
| Consumer USB Data Lines | Telecom Power Supply Input |
Use Scenario: ESD protection for USB 2.0 D+/D− lines in portable media players subjected to human-body-model discharges. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS integrated into USB connector subcircuit. Use Value: Adds <1 pF parasitic capacitance (per diode), preserving signal rise/fall times while clamping ±12 kV air discharge. | Use Scenario: Secondary-side transient suppression on 24 V DC input rails of VoIP phones and DSL modems. IC Role / Device Role / Timing Role: Parallel-connected TVS across input filter capacitor to absorb lightning-induced surges. Use Value: Absorbs up to 600 W for 1 ms, preventing overvoltage shutdown or regulator failure during telecom-grade surge tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | 400 W PPPM rating; same VWM and VC, but lower surge capacity and larger SMA package | Limited to lower-energy transients (IEC 61000-4-5 Level 2); less suitable for automotive load dump | Select when board space allows SMA and surge requirements are ≤400 W |
| 1.5KE18CA | 1500 W PPPM; axial-leaded DO-201 package; higher leakage (5 μA) | Requires through-hole assembly; better for high-energy industrial mains protection, not SMT-constrained designs | Choose for legacy through-hole systems needing higher power, not for new SMT automotive modules |
Compared with SMAJ18CA and 1.5KE18CA, the SM6T18CA-E3/5B offers optimal balance of 600 W surge capability, SMB footprint efficiency, and low leakage-making it preferred for space-constrained, high-reliability SMT applications such as automotive body electronics and industrial fieldbus nodes.
Availability
SM6T18CA-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer USB port protection, and telecom DC input stages requiring stable component supply and RoHS-compliant sourcing.
Supply support for SM6T18CA-E3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SM6T Series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and communications systems where AEC-Q101 readiness, high surge tolerance, and compact SMT packaging are essential.
FAQ
What is the clamping voltage of SM6T18CA-E3/5B at its rated peak pulse current?
The SM6T18CA-E3/5B exhibits a maximum clamping voltage (VC) of 25.2 V when subjected to a 10/1000 μs waveform peak pulse current (IPPM) of 24 A. This value is measured under standard test conditions (TA = 25 °C, mounted on 5.0 mm × 5.0 mm copper pads), and defines the upper voltage limit imposed on protected circuitry during surge events. The SM6T18CA-E3/5B maintains this clamping performance consistently across its operational temperature range.
Is SM6T18CA-E3/5B suitable for automotive applications?
Yes, SM6T18CA-E3/5B is compatible with automotive requirements via Vishay's AEC-Q101-qualified variants (e.g., SM6T18CAHE3_B/I). While the -E3/5B suffix denotes RoHS-compliant commercial grade, its SMB package, MSL Level 1 rating, 150 °C TJ max, and low-inductance design meet core automotive layout and reliability needs. For certified deployment, specify the HE3 or HM3 suffix versions of SM6T18CA-E3/5B.
How does the bidirectional configuration of SM6T18CA-E3/5B affect PCB layout?
The SM6T18CA-E3/5B has no polarity marking and functions identically in either orientation, simplifying PCB layout for differential or AC-coupled signals. Unlike unidirectional TVS diodes, it eliminates the need for orientation verification during automated placement and avoids risk of reverse installation. This symmetry allows direct replacement of discrete back-to-back diode pairs with a single SM6T18CA-E3/5B, reducing component count and board area.
What is the thermal resistance of SM6T18CA-E3/5B, and how does it impact power dissipation?
The SM6T18CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. These values assume mounting on 5.0 mm × 5.0 mm copper pads per terminal. At 5.0 W steady-state power dissipation (PD), this yields a ~500 °C junction-to-ambient delta-highlighting that PD applies only under ideal heatsinking; real-world derating above TA = 25 °C follows Fig. 2 in the datasheet. The SM6T18CA-E3/5B is intended for transient, not continuous, power handling.
Does SM6T18CA-E3/5B meet industry surge immunity standards?
Yes, the SM6T18CA-E3/5B is designed to support compliance with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) standards. Its 600 W peak pulse power rating aligns with Level 4 (4 kV) surge testing on 2 Ω source impedance per IEC 61000-4-5, and its sub-nanosecond response time ensures clamping before protected ICs experience overstress. System-level validation remains required, but the SM6T18CA-E3/5B provides the foundational protection element.
SM6T18CA-E3/5B 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T18CA-E3/5B FAQ
1.How can I place an order for SM6T18CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CA-E3/5B 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 SM6T18CA-E3/5B reliable?
The price and inventory of SM6T18CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SM6T18CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CA-E3/5B?
SM6T18CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CA-E3/5B 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 SM6T18CA-E3/5B?
For technical support, including SM6T18CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CA-E3/5B requirements.
6.How does Aetrix verify that SM6T18CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T18CA-E3/5B 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 SM6T18CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SM6T18CA-E3/5B?
All SM6T18CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CA-E3/5B, 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 SM6T18CA-E3/5B part is unused and in its original packaging.
Return procedure for SM6T18CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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