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Vishay General Semiconductor - Diodes Division 3KASMC18AHE3_B/I
- Part No.:
- 3KASMC18AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18AHE3_B/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,142
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Product details
Overview
3KASMC18AHE3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) 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 - deployed for automotive-grade overvoltage protection of MOSFETs and sensor signal lines.
For engineers reviewing the 3KASMC18AHE3_B/I datasheet, 3KASMC18AHE3_B/I pinout, 3KASMC18AHE3_B/I application, or 3KASMC18AHE3_B/I equivalent, key selection criteria include clamping voltage (29.2 V at IPPM), unidirectional polarity, AEC-Q101 qualification status, and thermal resistance (RθJA = 77.5 °C/W) under high-reliability board-level surge conditions.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping performance across -65 °C to +185 °C operating range. Its 10/1000 μs waveform response delivers 103 A peak pulse current with low incremental surge resistance and fast transient response.
The device is optimized for high-temperature stability in automotive engine control units and industrial motor drives. It meets MSL Level 1 per J-STD-020 and passes JESD 201 Class 2 whisker testing, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum reverse stand-off voltage before conduction begins; defines safe operating margin below breakdown |
| VBR (nom) | 21.1 V - nominal breakdown voltage at 1 mA test current; ensures predictable turn-on threshold under transients |
| VC @ IPPM | 29.2 V - clamping voltage at 103 A peak pulse current; limits downstream voltage stress during ESD/surge events |
| PPPM | 3000 W - peak pulse power handling capability with 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 immunity |
| TJ max | +185 °C - maximum junction temperature rating; enables use in under-hood automotive environments without derating |
| RθJA | 77.5 °C/W - thermal resistance junction-to-ambient; determines power dissipation limit on standard PCB pad layout |
| Polarity | Unidirectional - protects against positive-going transients only; requires correct cathode orientation in circuit |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded case meeting UL 94 V-0 flammability rating; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Receives surge current during overvoltage events; connects to protected line (e.g., CAN_H, sensor output) |
| Anode | Reference return path | Connects to system ground or low-impedance reference plane; completes clamping path during transient conduction |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR drift ≤ ±0.083 %/°C and long-term reliability under thermal cycling |
| AEC-Q101 qualification | Validated for automotive applications including powertrain and ADAS modules; base P/NHE3 suffix confirms qualification |
| MSL Level 1 | Rated for reflow up to 260 °C peak; no moisture sensitivity concerns during standard SMT assembly |
| Low clamping ratio | VC/VBR = 29.2/21.1 ≈ 1.38 - tight clamping margin reduces voltage overshoot on protected ICs versus competing TVS devices |
| High IFSM | 200 A surge rating (8.3 ms half-sine) - withstands repetitive load dump or inductive kick events in 12 V systems |
Applications
| Automotive Powertrain Control | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Protecting gate drivers and microcontroller I/O pins from load dump and alternator ripple in engine control units. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across power rails and signal inputs to clamp spikes before they reach sensitive logic. Use Value: Enables compliance with ISO 7637-2 Pulse 5a (load dump) with <29.2 V clamping, preserving MCU functionality during 12 V system faults. |
Use Scenario: Shielding encoder feedback lines and PWM gate signals from commutation-induced transients in variable-frequency drives. IC Role / Device Role / Timing Role: Unidirectional TVS connected between differential signal pair and ground to absorb inductive switching noise. Use Value: Maintains signal integrity under 3000 W surge events while supporting >10⁵ surge cycles due to robust junction passivation. |
| Automotive ADAS Sensor Interface | Telecom Power Supply Input |
Use Scenario: Safeguarding radar and camera module LVDS/FPD-Link signal lines from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector entry point to shunt transients before reaching serializer/deserializer ICs. Use Value: Delivers 29.2 V clamping at 103 A without signal distortion, meeting AEC-Q101 requirements for safety-critical vision systems. |
Use Scenario: Front-end protection for AC/DC power supplies in base station equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge suppression stage on DC input rail prior to DC-DC converters and PMICs. Use Value: Handles 3000 W pulses with RθJA = 77.5 °C/W, enabling stable operation in sealed telecom enclosures up to +85 °C ambient. |
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-E3/57T | Lower PPPM (400 W), higher VC (32.4 V), same SMC package and VWM (18 V) | Not AEC-Q101 qualified; suitable for commercial-grade industrial power supplies but not automotive | Select when cost sensitivity outweighs automotive qualification and surge energy requirements |
| SMCJ18AHE3_A/H | Same 3000 W PPPM and 185 °C TJ max, but VBR min = 20.0 V (vs. 20.0–22.1 V for 3KASMC18A); identical AEC-Q101 status | Identical application scope; differs only in tighter VBR tolerance (±5% vs. ±10%) and packaging format (7" reel) | Choose for tighter voltage matching in precision clamping circuits where VBR consistency across production lots is critical |
Compared with SMAJ18A-E3/57T and SMCJ18AHE3_A/H, the 3KASMC18AHE3_B/I offers broader VBR tolerance (20.0–22.1 V) with guaranteed AEC-Q101 qualification and 13" tape-and-reel delivery - balancing automotive compliance, surge robustness, and volume procurement flexibility.
Availability
3KASMC18AHE3_B/I is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drive protection, and ADAS sensor interface applications requiring stable component supply with full traceability and lifecycle continuity.
Supply support for 3KASMC18AHE3_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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMC18AHE3_B/I belongs to Vishay's PAR® (Protected Anisotropic Rectifier) TVS family, engineered specifically for robust transient suppression in harsh-environment automotive and industrial systems where junction stability and surge endurance are critical.
FAQ
What is the clamping voltage of the 3KASMC18AHE3_B/I at its rated peak pulse current?
The 3KASMC18AHE3_B/I has a maximum clamping voltage (VC) of 29.2 V at 103 A peak pulse current (IPPM), measured under the standardized 10/1000 μs waveform. This value is specified in the Electrical Characteristics table of Vishay document 88480 and defines the upper voltage limit imposed on protected circuitry during surge events. The 3KASMC18AHE3_B/I maintains this clamping performance across its full operating temperature range.
Is the 3KASMC18AHE3_B/I qualified for automotive applications?
Yes, the 3KASMC18AHE3_B/I is AEC-Q101 qualified, as confirmed by its HE3 suffix and explicit statement in Vishay document 88480. It is rated for operation from -65 °C to +185 °C and meets JESD 201 Class 2 whisker testing and MSL Level 1 reflow requirements - making it suitable for engine control units, ADAS modules, and other automotive subsystems requiring certified reliability.
What does the "B/I" suffix mean in 3KASMC18AHE3_B/I?
The "B/I" suffix in 3KASMC18AHE3_B/I indicates revision level "B" and packaging in 13-inch diameter plastic tape and reel with 3500 units per reel, per Vishay's Ordering Information table. The "HE3" portion confirms RoHS-compliance and AEC-Q101 qualification, while "I" specifically denotes the large-reel delivery format used for high-volume SMT production.
How does the thermal resistance of the 3KASMC18AHE3_B/I affect its power handling?
The 3KASMC18AHE3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W on the recommended pad layout. This means that at 25 °C ambient, its 6.0 W steady-state power dissipation limit corresponds to a ~465 °C junction rise - but since TJ max is 185 °C, continuous DC power must be limited to ~2.3 W. The 3KASMC18AHE3_B/I is intended for transient, not continuous, power dissipation.
Can the 3KASMC18AHE3_B/I replace a bidirectional TVS in existing designs?
No, the 3KASMC18AHE3_B/I is unidirectional only, as stated in the Features section of Vishay document 88480. It conducts only for positive transients relative to its cathode. Replacing a bidirectional TVS would require verifying that negative-going transients are either absent or handled elsewhere in the system - otherwise, a bidirectional part like 3KASMC18CAHE3_B/I must be selected instead.
3KASMC18AHE3_B/I 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/I FAQ
1.How can I place an order for 3KASMC18AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18AHE3_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 3KASMC18AHE3_B/I reliable?
The price and inventory of 3KASMC18AHE3_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 3KASMC18AHE3_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC18AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18AHE3_B/I?
3KASMC18AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18AHE3_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 3KASMC18AHE3_B/I?
For technical support, including 3KASMC18AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18AHE3_B/I requirements.
6.How does Aetrix verify that 3KASMC18AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC18AHE3_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 3KASMC18AHE3_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC18AHE3_B/I?
All 3KASMC18AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18AHE3_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 3KASMC18AHE3_B/I part is unused and in its original packaging.
Return procedure for 3KASMC18AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC18AHE3_B/I Tags
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