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Vishay General Semiconductor - Diodes Division SM6T18AHE3_B/I
- Part No.:
- SM6T18AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18AHE3_B/I.pdf
- Description:
- 600W,18V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,740
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Product details
Overview
SM6T18AHE3_B/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 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR at 1 mA), 25.2 V max 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 SM6T18AHE3_B/I datasheet, SM6T18AHE3_B/I pinout, SM6T18AHE3_B/I application, or SM6T18AHE3_B/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, RoHS-compliant matte tin terminals, MSL Level 1 rating, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
The SM6T18AHE3_B/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 of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead).
It is rated for continuous power dissipation of 5.0 W at 50 °C on infinite heatsink, supports 100 A non-repetitive forward surge current (10 ms half-sine), and maintains operation across -65 °C to +150 °C junction temperature range - enabling use in under-hood automotive environments and industrial control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - maximum reverse working voltage before leakage exceeds 1 μA; defines safe operating margin below clamping threshold |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - ensures reliable avalanche conduction onset within tight tolerance band for predictable protection |
| VC @ IPPM | 25.2 V at 24 A (10/1000 μs) - limits transient voltage seen by downstream ICs to safe level during surge |
| PPPM | 600 W - peak pulse power handling capacity per standardized waveform; validates robustness against IEC 61000-4-5 surges |
| TJ max | +150 °C - enables deployment in high-temperature automotive and industrial enclosures without derating |
| RθJA | 100 °C/W - thermal performance baseline for PCB layout design using recommended 0.2" × 0.2" copper pads per terminal |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on unidirectional device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse bias reference | Connected to lower-potential side (e.g., ground or return path); defines directionality of clamping action |
| Cathode | Avalanche conduction node / clamping output | Connected to protected line (e.g., 12 V rail or sensor signal); conducts surge current to anode when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| 600 W peak pulse power (10/1000 μs) | Validates compliance with IEC 61000-4-5 Level 3 (1 kV surge) on 50 Ω source impedance |
| AEC-Q101 qualified | Confirms suitability for automotive applications including engine control units and ADAS sensor interfaces |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free reflow profiles without preconditioning or dry-pack requirements |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground to clamp transients before they reach sensitive input stages. Use Value: Limits induced voltage to ≤25.2 V during 24 A surge, preserving signal integrity and preventing latch-up in 3.3 V/5 V interface ICs. | Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges from solenoid switching or lightning-induced coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V DC input lines, absorbing energy before it reaches optocoupler or MCU GPIO protection networks. Use Value: Withstands 600 W pulses while maintaining <1 μA leakage at 15.3 V, ensuring no false triggering during normal operation. |
| Consumer Power Adapter Input | Telecom Line Card Surge Suppression |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters exposed to mains-borne transients per IEC 61000-4-4. IC Role / Device Role / Timing Role: Unidirectional clamping device across DC output rails (e.g., 12 V or 19 V), referenced to common ground. Use Value: Fast avalanche response (<1 ns) and low clamping voltage prevent damage to downstream DC-DC converters and USB-PD controllers. | Use Scenario: Front-end protection for Ethernet PHYs and DSL line drivers subjected to longitudinal surges on twisted-pair telecom lines. IC Role / Device Role / Timing Role: Primary-level TVS on differential pair inputs, configured with cathode tied to higher-potential line and anode to lower-potential line. Use Value: 25.2 V clamping ensures PHY ESD tolerance margins remain intact even after repeated 10/1000 μs surges up to 24 A. |
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-E3/5B | Same SMB package, 18 V nominal VBR, but 400 W PPPM (vs. 600 W); higher VC = 29.2 V at 17.3 A | Limited to lower-energy surge environments (IEC 61000-4-5 Level 2); not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification and higher surge immunity |
| SMCJ18AHE3_A/H | Same AEC-Q101 qualification and 18 V rating, but larger SMC (DO-214AB) package; 1500 W PPPM, VC = 29.2 V at 51.3 A | Requires larger PCB footprint; suited for primary-side or high-energy industrial surge zones | Choose when system-level surge testing exceeds 600 W and board space permits SMC footprint |
Compared with SMAJ18A-E3/5B and SMCJ18AHE3_A/H, the SM6T18AHE3_B/I delivers optimal balance of AEC-Q101 compliance, 600 W surge capability, and compact SMB footprint - making it preferred for space-constrained automotive and industrial edge nodes where both qualification and moderate energy handling are required.
Availability
SM6T18AHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O modules, consumer power adapter outputs, and telecom line card protection requiring stable component supply and full traceability.
Supply support for SM6T18AHE3_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, automotive qualification, and high-volume manufacturability.
The SM6T Series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust, low-inductance transient suppression in automotive, industrial, and consumer electronics - with focus on AEC-Q101 compliance and automated SMT compatibility.
FAQ
What is the polarity configuration of the SM6T18AHE3_B/I?
The SM6T18AHE3_B/I is a unidirectional TVS diode. Its cathode is marked by a band on the SMB package body, and it conducts avalanche current only when the cathode is at higher potential than the anode - making it suitable for DC rail and signal-line clamping where polarity is fixed. This differs from bidirectional variants (e.g., SM6T18CA) which suppress transients in both directions.
Is the SM6T18AHE3_B/I qualified for automotive applications?
Yes, the SM6T18AHE3_B/I is AEC-Q101 qualified, as confirmed by its HE3 suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024). This qualification covers stress tests including HTGB, HTRB, TCT, and ESD, validating its use in automotive subsystems such as body control modules, infotainment power supplies, and sensor front-ends.
What is the maximum clamping voltage of the SM6T18AHE3_B/I under surge conditions?
The SM6T18AHE3_B/I 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 per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring compatibility with 3.3 V, 5 V, and 12 V logic interfaces.
Does the SM6T18AHE3_B/I require special PCB layout considerations?
Yes - the SM6T18AHE3_B/I achieves its rated 600 W pulse power only when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Smaller pads increase thermal resistance and reduce surge capability; routing traces directly to the pads (not vias) minimizes inductance and preserves clamping speed.
What does the "_B/I" suffix indicate in SM6T18AHE3_B/I?
The "_B/I" suffix in SM6T18AHE3_B/I denotes packaging configuration: "B" indicates tape-and-reel revision code (e.g., revision B of the reel specification), and "I" specifies 13-inch diameter plastic tape and reel with 3200 units per reel - distinct from "H" (7-inch reel, 750 units). This affects logistics and SMT feeder setup but not electrical or mechanical characteristics of the SM6T18AHE3_B/I device itself.
SM6T18AHE3_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:
- 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:
- 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)
SM6T18AHE3_B/I FAQ
1.How can I place an order for SM6T18AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18AHE3_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 SM6T18AHE3_B/I reliable?
The price and inventory of SM6T18AHE3_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 SM6T18AHE3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T18AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18AHE3_B/I?
SM6T18AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18AHE3_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 SM6T18AHE3_B/I?
For technical support, including SM6T18AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18AHE3_B/I requirements.
6.How does Aetrix verify that SM6T18AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T18AHE3_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 SM6T18AHE3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T18AHE3_B/I?
All SM6T18AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18AHE3_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 SM6T18AHE3_B/I part is unused and in its original packaging.
Return procedure for SM6T18AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18AHE3_B/I Tags
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