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Vishay General Semiconductor - Diodes Division SM6T18CAHE3/5B
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- Part No.:
- SM6T18CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CAHE3/5B.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,076
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Product details
Overview
SM6T18CAHE3/5B 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 15.3 V standoff 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 rating with 10/1000 μs waveform - used to protect automotive sensor interfaces and industrial I/O circuits.
For engineers reviewing the SM6T18CAHE3/5B datasheet, SM6T18CAHE3/5B pinout, SM6T18CAHE3/5B application, or SM6T18CAHE3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.43), SMB package thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement per J-STD-002.
Technical Context
The SM6T18CAHE3/5B operates as a bidirectional avalanche diode, symmetrically clamping both positive and negative transients without polarity dependence. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 μA at VWM), while the low-inductance SMB package supports fast response to ESD and lightning-induced surges.
Rated for operation from −65 °C to +150 °C, it delivers 600 W peak pulse power under standardized 10/1000 μs waveform conditions when mounted on 5.0 mm × 5.0 mm copper pads. The device is AEC-Q101 qualified (HE3 suffix), making it suitable for automotive powertrain and body electronics where reliability under thermal cycling and mechanical stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Confirmed avalanche breakdown threshold; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 25.2 V at 24 A (10/1000 μs) - Clamped voltage seen by downstream ICs; limits stress on MOSFET gates or MCU I/O pins. |
| PPPM | 600 W - Peak transient energy absorption capacity; sustains ISO 7637-2 Pulse 1/2/5a surge waveforms in automotive systems. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood environments without derating below 125 °C ambient. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient; informs PCB pad design for thermal management in high-reliability applications. |
Pinout & Package
SMB (DO-214AA) surface-mount package with matte tin-plated leads, compliant with J-STD-002 solderability and JESD 22-B102 whisker testing. Bidirectional construction means no cathode/anode marking; terminals are symmetrical and non-polarized.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts bidirectionally when voltage exceeds ±VBR, enabling single-device protection of AC-coupled or differential lines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor modules per stress test requirements. |
| 600 W peak pulse power (10/1000 μs) | Withstands high-energy transients from inductive load switching (e.g., fuel injector drivers) without degradation. |
| Low clamping voltage (25.2 V @ 24 A) | Minimizes voltage overshoot on 12 V automotive rails, protecting 3.3 V/5 V logic interfaces via series impedance. |
| MSL Level 1 (J-STD-020) | Unlimited floor life at ≤30 °C/60 % RH; compatible with standard reflow profiles up to 260 °C peak. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (<1 μA) across temperature and lifetime, critical for battery-powered sensors. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., oxygen, pressure) from load dump and jump-start transients in vehicles. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to shunt surge energy before reaching PHY layer. Use Value: Maintains signal integrity during ISO 16750-2 load dump tests (up to 35 V, 100 ms) while limiting clamped voltage to 25.2 V. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Primary transient suppression element on each channel's input line, upstream of optocoupler or Schmitt trigger. Use Value: Enables robust operation under IEC 61000-4-5 Level 3 (1 kV line-earth) with no additional series components required. |
| Consumer Power Adapter Interface | Telecom Line Card Surge Protection |
Use Scenario: Input-stage protection for USB-C PD adapters and AC/DC converters exposed to mains-borne surges and ESD. IC Role / Device Role / Timing Role: First-line defense on secondary-side DC output rails, clamping fast-rising transients before DC-DC controller ICs. Use Value: Achieves <1 ns response time and <25.2 V clamping, preventing latch-up in synchronous rectifier MOSFETs. |
Use Scenario: Protecting Ethernet PHYs and DSL line drivers from lightning-induced surges on twisted-pair telecom lines. IC Role / Device Role / Timing Role: Differential-mode TVS across data pairs (e.g., TX+/TX−), leveraging bidirectional symmetry for full-duplex immunity. Use Value: Supports GR-1089-CORE Level 3 surge immunity (10/700 μs, 10 kV) with minimal capacitance impact on signal integrity. |
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 | 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; limited to commercial-grade consumer/industrial use. | Select when cost sensitivity outweighs automotive qualification and higher surge margin. |
| 1.5KE18CA | Higher PPPM (1500 W), DO-201 package (through-hole); VC = 27.7 V at 54.3 A; no AEC-Q101 rating. | Requires PCB through-hole mounting; unsuitable for high-density SMT designs or automotive vibration environments. | Choose only for legacy through-hole systems needing higher energy handling without re-layout. |
Compared with SMAJ18CA and 1.5KE18CA, SM6T18CAHE3/5B uniquely combines AEC-Q101 qualification, SMB footprint, and 600 W surge rating - enabling drop-in replacement in automotive SMT production without compromising reliability or board space.
Availability
SM6T18CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line card protection requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101-compliant sourcing.
Supply support for SM6T18CAHE3/5B 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SM6T Series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SM6T18CAHE3/5B at its rated peak pulse current?
The SM6T18CAHE3/5B has 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 standardized test conditions with 0.2" × 0.2" copper pads and confirms the device's ability to limit transient overvoltage to a safe level for downstream 12 V–24 V system components. The SM6T18CAHE3/5B maintains this clamping performance across its full operating temperature range.
Is SM6T18CAHE3/5B suitable for automotive applications?
Yes, SM6T18CAHE3/5B is AEC-Q101 qualified, as indicated by the "HE3" suffix, and is specifically intended for automotive use including engine control, body electronics, and ADAS sensor protection. It meets stringent stress test requirements for temperature cycling, humidity, and mechanical shock. The SM6T18CAHE3/5B also complies with J-STD-020 MSL Level 1 and RoHS, supporting reliable reflow assembly in automotive manufacturing.
What does the "CA" suffix mean in SM6T18CAHE3/5B?
The "CA" suffix in SM6T18CAHE3/5B denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SM6T18A), the SM6T18CAHE3/5B has no polarity marking and functions identically regardless of terminal orientation - ideal for protecting AC-coupled signals, differential buses, or dual-rail power domains.
What is the standoff voltage (VWM) of SM6T18CAHE3/5B, and why does it matter?
The standoff voltage (VWM) of SM6T18CAHE3/5B is 15.3 V - the maximum continuous reverse voltage the device can withstand without entering breakdown. This parameter ensures normal circuit operation under nominal conditions while allowing rapid clamping when transients exceed VBR. For a 12 V automotive system, VWM = 15.3 V provides sufficient margin above nominal rail voltage while avoiding false triggering during load dump overshoots. The SM6T18CAHE3/5B uses this VWM to balance protection responsiveness and system stability.
How does the SMB (DO-214AA) package of SM6T18CAHE3/5B affect thermal performance?
The SMB package of SM6T18CAHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 5.0 mm × 5.0 mm copper pads. This allows effective heat dissipation during transient events but requires adherence to recommended pad layout for rated performance. Compared to larger packages like DO-201, the SMB footprint saves board space while maintaining adequate surge handling - a key advantage in compact automotive ECUs where the SM6T18CAHE3/5B is commonly deployed.
SM6T18CAHE3/5B 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:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T18CAHE3/5B FAQ
1.How can I place an order for SM6T18CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CAHE3/5B 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 SM6T18CAHE3/5B reliable?
The price and inventory of SM6T18CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SM6T18CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CAHE3/5B?
SM6T18CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CAHE3/5B 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 SM6T18CAHE3/5B?
For technical support, including SM6T18CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CAHE3/5B requirements.
6.How does Aetrix verify that SM6T18CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T18CAHE3/5B 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 SM6T18CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SM6T18CAHE3/5B?
All SM6T18CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CAHE3/5B, 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 SM6T18CAHE3/5B part is unused and in its original packaging.
Return procedure for SM6T18CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18CAHE3/5B Tags
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