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Vishay General Semiconductor - Diodes Division 3KASMC18AHE3_B/H
- Part No.:
- 3KASMC18AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18AHE3_B/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,272
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Product details
Overview
3KASMC18AHE3_B/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 18 V stand-off voltage (VWM), 21.1 V nominal breakdown (VBR), 3000 W peak pulse power (10/1000 μs), and 185 °C maximum junction temperature-designed for automotive-grade overvoltage protection of MOSFETs and sensor signal lines.
For engineers reviewing the 3KASMC18AHE3_B/H datasheet, 3KASMC18AHE3_B/H pinout, 3KASMC18AHE3_B/H application, or 3KASMC18AHE3_B/H equivalent, key selection criteria include clamping voltage at rated surge current, AEC-Q101 qualification status, thermal resistance (RθJL = 18.3 °C/W), and unidirectional polarity with cathode band marking.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to deliver stable clamping under high-temperature operation up to TJ = 185 °C. Its unidirectional architecture enables robust protection against positive-going transients on DC-biased lines without forward conduction during normal operation.
The device meets MSL Level 1 per J-STD-020 (peak reflow ≤ 260 °C) and is AEC-Q101 qualified-confirmed by HE3 suffix-making it suitable for automotive powertrain and body electronics where reliability under thermal cycling and surge stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (nom) | 21.1 V - Breakdown voltage at 1 mA test current; defines onset of avalanche conduction |
| VC @ IPPM | 29.2 V - Clamping voltage at 103 A peak pulse current; limits protected circuit voltage during surge |
| PPPM | 3000 W - Peak pulse power handling capability with 10/1000 μs waveform |
| TJ max | +185 °C - Enables use in under-hood automotive environments without derating |
| RθJL | 18.3 °C/W - Low junction-to-lead thermal resistance supports high surge energy dissipation |
| Polarity | Unidirectional - Protects only against positive transients relative to cathode; requires correct orientation |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified. Cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink terminal during clamping | Connected to protected line; conducts surge current toward ground when voltage exceeds VBR |
| Cathode | Reference/ground return path | Connected to system ground or low-impedance return; marked with visible band for orientation |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable VBR drift < ±0.083 %/°C and long-term reliability under thermal cycling |
| 3000 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) in compact SMC footprint |
| AEC-Q101 qualification (HE3 suffix) | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| MSL Level 1, 260 °C peak reflow | Permits single-pass lead-free reflow assembly without moisture-induced damage |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., inductive switch-off) |
Applications
| Automotive Powertrain Control | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Suppressing load-dump and alternator ripple transients on 12 V battery rails feeding ECU microcontrollers and gate drivers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local regulator input to clamp surges before LDO or DC/DC converter. Use Value: Withstands 185 °C ambient and clamps to ≤29.2 V at 103 A, preventing latch-up or burnout of downstream 3.3 V/5 V logic. | Use Scenario: Protecting gate drive signal lines of IGBTs in variable-frequency drives from cross-talk and switching noise. IC Role / Device Role / Timing Role: TVS mounted at motor controller PCB edge, shunting fast dv/dt spikes induced by adjacent high-current switching. Use Value: 29.2 V clamping voltage ensures gate oxide integrity of 30 V-rated IGBT drivers while maintaining signal rise time. |
| Automotive Sensor Interface | Telecom Power Supply Input |
Use Scenario: Safeguarding LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in vehicle cabin modules. IC Role / Device Role / Timing Role: Unidirectional TVS connected between sensor signal line and chassis ground to absorb ESD and cable discharge events. Use Value: 1.0 μA leakage at 18 V ensures minimal impact on 12-bit ADC accuracy; AEC-Q101 qualification guarantees field longevity. | Use Scenario: Front-end surge suppression on 48 V telecom power inputs exposed to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary TVS stage in multi-stage protection network, absorbing bulk energy before downstream MOV or GDT. Use Value: 3000 W rating allows single-device handling of 2 kA (10/1000 μs) events; SMC package enables automated placement in high-volume production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18AHE3_A/H | Lower PPPM (400 W), same VWM/VBR, SMA package (smaller footprint, higher RθJA = 110 °C/W) | Not suitable for 3000 W surge events; limited to low-energy ESD or board-level transients | Select only if surge energy is ≤400 W and space-constrained layout prohibits SMC |
| SMCJ18AHE3_A/H | Same SMC package, identical VWM/VBR/PPPM, but rated for 175 °C TJ max (vs. 185 °C) | Lacks extended high-temperature capability required for under-hood automotive zones | Acceptable for industrial or cabin applications where ambient ≤125 °C; verify thermal margin vs. 3KASMC18AHE3_B/H |
Compared with SMAJ18AHE3_A/H and SMCJ18AHE3_A/H, the 3KASMC18AHE3_B/H delivers superior thermal endurance (185 °C TJ max) and identical 3000 W surge capacity in the SMC footprint-making it the preferred choice for AEC-Q101–mandated automotive powertrain and high-reliability industrial systems.
Availability
3KASMC18AHE3_B/H is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drive protection, and telecom power supply input requiring stable component supply with AEC-Q101 compliance and high-temperature reliability.
Supply support for 3KASMC18AHE3_B/H 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, TVS devices, and optoelectronics with emphasis on high-reliability and automotive-grade performance.
The 3KASMCxxA family is engineered specifically for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications demanding AEC-Q101 qualification, 185 °C operation, and 3000 W surge capability in surface-mount form.
FAQ
What is the clamping voltage of the 3KASMC18AHE3_B/H at its rated peak pulse current?
The 3KASMC18AHE3_B/H has a maximum clamping voltage (VC) of 29.2 V at its rated peak pulse current (IPPM) of 103 A, measured using a 10/1000 μs waveform. This value ensures protected circuits remain below critical voltage thresholds during surge events. The 3KASMC18AHE3_B/H achieves this clamping performance while maintaining low incremental surge resistance and stable behavior across temperature.
Is the 3KASMC18AHE3_B/H AEC-Q101 qualified?
Yes, the 3KASMC18AHE3_B/H is AEC-Q101 qualified, as confirmed by its HE3 suffix and documentation in Vishay's 88480 datasheet. This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD-validating suitability for automotive applications such as engine control units and ADAS sensor interfaces. The 3KASMC18AHE3_B/H meets all requirements for Grade 0 (−40 °C to +185 °C) operation.
What package type does the 3KASMC18AHE3_B/H use, and what are its mounting requirements?
The 3KASMC18AHE3_B/H uses the SMC (DO-214AB) surface-mount package with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. It requires the minimum recommended pad layout specified in the datasheet (0.126" × 0.060" pads) and is rated MSL Level 1 with peak reflow tolerance up to 260 °C. The cathode is marked by a visible band, and orientation must be verified during placement to ensure correct unidirectional protection. The 3KASMC18AHE3_B/H also passes JESD 201 Class 2 whisker testing.
How does the 3KASMC18AHE3_B/H compare to standard SMAJ-series TVS diodes in surge handling?
The 3KASMC18AHE3_B/H provides 3000 W peak pulse power (10/1000 μs), which is 7.5× higher than the 400 W rating of SMAJ18AHE3_A/H. Both share the same 18 V VWM and ~21 V VBR, but the 3KASMC18AHE3_B/H achieves its higher energy rating via larger SMC package geometry and optimized junction design. This makes the 3KASMC18AHE3_B/H suitable for IEC 61000-4-5 Level 4 surges where SMAJ devices would fail catastrophically.
What is the maximum junction temperature rating for the 3KASMC18AHE3_B/H, and why is it significant?
The 3KASMC18AHE3_B/H is rated for a maximum junction temperature (TJ max) of +185 °C-exceeding the 175 °C limit of most competing SMC-packaged TVS diodes. This extended rating enables reliable operation in under-hood automotive locations (e.g., near engines or inverters) and high-power industrial enclosures where ambient temperatures exceed 125 °C. The 3KASMC18AHE3_B/H maintains stable VBR and clamping performance across this full range, validated per AEC-Q101.
3KASMC18AHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 103A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
3KASMC18AHE3_B/H FAQ
1.How can I place an order for 3KASMC18AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18AHE3_B/H 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 3KASMC18AHE3_B/H reliable?
The price and inventory of 3KASMC18AHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC18AHE3_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC18AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18AHE3_B/H?
3KASMC18AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18AHE3_B/H 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 3KASMC18AHE3_B/H?
For technical support, including 3KASMC18AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18AHE3_B/H requirements.
6.How does Aetrix verify that 3KASMC18AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC18AHE3_B/H 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 3KASMC18AHE3_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC18AHE3_B/H?
All 3KASMC18AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18AHE3_B/H, 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 3KASMC18AHE3_B/H part is unused and in its original packaging.
Return procedure for 3KASMC18AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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