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Vishay General Semiconductor - Diodes Division SM6T18AHE3/5B
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- Part No.:
- SM6T18AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18AHE3/5B.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,697
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Product details
Overview
SM6T18AHE3/5B 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 18 V breakdown voltage (VBR = 17.1–18.9 V at 1.0 mA), 15.3 V stand-off voltage (VWM), 25.2 V maximum clamping voltage (VC) at 24.0 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 SM6T18AHE3/5B datasheet, SM6T18AHE3/5B pinout, SM6T18AHE3/5B application, or SM6T18AHE3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, SMB package thermal resistance (RθJA = 100 °C/W), clamping performance under 10/1000 μs surge, and compliance with J-STD-002 solderability standards.
Technical Context
The SM6T18AHE3/5B operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 17.1–18.9 V breakdown threshold. Its glass-passivated junction ensures stable leakage (<1.0 μA at 15.3 V) and low inductance for fast response to ESD and switching surges.
Designed for surface-mount placement on PCBs with 0.2" × 0.2" copper pads per terminal, it delivers 600 W peak pulse power dissipation and supports 100 A non-repetitive forward surge current (10 ms half-sine), with junction temperature rated from –65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA - defines precise avalanche initiation range for reliable overvoltage triggering |
| VWM | 15.3 V - maximum continuous reverse operating voltage before leakage rises above 1.0 μA |
| VC @ IPPM | 25.2 V at 24.0 A (10/1000 μs) - clamping voltage limiting downstream IC stress during surge events |
| PPPM | 600 W - peak transient energy absorption capability without failure under standardized waveform |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, critical for derating above 25 °C ambient |
| TJ max. | +150 °C - maximum allowable junction temperature supporting operation in under-hood automotive environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
SMB (DO-214AA) surface-mount package with matte tin-plated leads; cathode indicated by band marking; compliant with UL 94 V-0 flammability rating and J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / surge return path | Connected to ground or low-impedance reference plane during transient suppression |
| Cathode | Avalanche clamping node / protected line connection | Connected to the line being protected (e.g., 12 V rail or sensor signal); band-marked end |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Load Dump and IEC 61000-4-5 surge events in automotive ECUs |
| Glass passivated chip junction | Ensures stable VBR tolerance and low leakage drift over temperature and lifetime |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications requiring zero defects and extended temperature cycling reliability |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (e.g., ESD >1 kV/ns) |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Stage |
|---|---|
Use Scenario: Protecting 12 V supply inputs of BCM microcontrollers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between fused battery rail and LDO input. Use Value: Limits transient voltage to ≤25.2 V, preventing damage to 3.3 V/5 V logic supplies downstream. |
Use Scenario: Safeguarding 24 V digital input optocouplers in factory automation I/O modules. IC Role / Device Role / Timing Role: Standoff-rated TVS on field-side signal line prior to series resistor and opto-LED. Use Value: Clamps induced surges from solenoid switching to safe levels while maintaining <1.0 μA leakage at 24 V nominal. |
| Automotive Occupant Detection Sensor | Consumer Appliance Motor Drive Interface |
Use Scenario: Shielding capacitive seat sensor analog front-end from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential sense lines near ADC input pins. Use Value: Provides sub-25 V clamping with minimal signal distortion due to SMB's low parasitic inductance. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Unidirectional TVS across motor terminals, referenced to chassis ground. Use Value: Absorbs 600 W pulses without degradation, enabling compact layout with no heatsink required. |
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, but lower 400 W PPPM; VC = 29.2 V @ 13.7 A; not AEC-Q101 qualified | Limited to commercial-grade industrial or consumer use; insufficient for automotive load dump | Select only if cost-sensitive and AEC-Q101 not required; verify clamping margin against system surge profile |
| 1.5SMC18A | Higher-power SMC package (1500 W), larger footprint; VC = 29.2 V @ 51.3 A; AEC-Q101 available only in HE3 variant | Used where higher energy handling is needed (e.g., main battery feed), but requires PCB area increase | Choose when system-level surge tests exceed 600 W; confirm layout space and thermal pad compatibility |
Compared with SMAJ18A-E3/5B and 1.5SMC18A, the SM6T18AHE3/5B uniquely balances AEC-Q101 qualification, SMB footprint, and 600 W capability - making it optimal for space-constrained automotive modules where both reliability and size matter.
Availability
SM6T18AHE3/5B is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and consumer appliance motor control systems requiring stable component supply and long-term lifecycle support.
Supply support for SM6T18AHE3/5B 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM6T Series was engineered specifically for surface-mount transient suppression in harsh environments, emphasizing AEC-Q101 compliance, low-inductance packaging, and repeatable clamping performance across temperature.
FAQ
What is the polarity configuration of the SM6T18AHE3/5B?
The SM6T18AHE3/5B is a unidirectional TVS diode, with the banded end denoting the cathode. This configuration allows it to conduct only during reverse overvoltage events while blocking forward current - essential for protecting DC power rails like automotive 12 V systems. Its unidirectional behavior is confirmed in the Vishay SM6T datasheet, Table "ELECTRICAL CHARACTERISTICS", where VBR and VC values are specified for reverse bias only. The SM6T18AHE3/5B does not function as a bidirectional device.
Is the SM6T18AHE3/5B qualified for automotive applications?
Yes, the SM6T18AHE3/5B is AEC-Q101 qualified, as indicated by the "HE3" suffix in its part number. This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD per ANSI/ESDA-JEDEC JS-001. The qualification applies specifically to the HE3 variant and is documented in Vishay's official SM6T family datasheet revision 09-Jan-2024. The SM6T18AHE3/5B is approved for use in automotive body electronics, infotainment power supplies, and sensor interface circuits.
What is the maximum clamping voltage of the SM6T18AHE3/5B under surge conditions?
The SM6T18AHE3/5B has a maximum clamping voltage (VC) of 25.2 V when subjected to a 10/1000 μs waveform peak pulse current of 24.0 A. This value is measured per Figure 1 and Table "ELECTRICAL CHARACTERISTICS" in the Vishay SM6T datasheet. It represents the upper limit of voltage seen by downstream circuitry during standardized surge events - critical for ensuring compatibility with 3.3 V or 5 V logic supplies protected by this device. The SM6T18AHE3/5B maintains this clamping performance across its full operating temperature range.
Does the SM6T18AHE3/5B meet RoHS and halogen-free requirements?
The SM6T18AHE3/5B is RoHS-compliant and meets Vishay's material categorization standards per document 99912. The "HE3" suffix denotes RoHS-compliant construction with AEC-Q101 qualification; it is not halogen-free - that designation applies only to "HM3" variants. Lead finish is matte tin, solderable per J-STD-002 and JESD 22-B102. The SM6T18AHE3/5B is also MSL Level 1 rated with a maximum peak reflow temperature of 260 °C, supporting lead-free assembly processes without preconditioning.
What is the thermal resistance of the SM6T18AHE3/5B, and how does it affect layout?
The SM6T18AHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay SM6T datasheet "THERMAL CHARACTERISTICS" table. This value directly impacts PCB layout: reducing pad size or omitting thermal vias increases effective RθJA, requiring derating of power handling above 25 °C ambient. For sustained operation near 150 °C junction temperature, the SM6T18AHE3/5B must be placed on adequately sized copper areas per Vishay's recommended mounting pad layout.
SM6T18AHE3/5B 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:
- 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)
SM6T18AHE3/5B FAQ
1.How can I place an order for SM6T18AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18AHE3/5B 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 SM6T18AHE3/5B reliable?
The price and inventory of SM6T18AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18AHE3/5B is usually 5 days.
3.What payment methods are accepted for SM6T18AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18AHE3/5B?
SM6T18AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18AHE3/5B 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 SM6T18AHE3/5B?
For technical support, including SM6T18AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18AHE3/5B requirements.
6.How does Aetrix verify that SM6T18AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T18AHE3/5B 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 SM6T18AHE3/5B meets industry standards.
7.What is the process for return or replacement of SM6T18AHE3/5B?
All SM6T18AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18AHE3/5B, 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 SM6T18AHE3/5B part is unused and in its original packaging.
Return procedure for SM6T18AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18AHE3/5B Tags
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