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Vishay General Semiconductor - Diodes Division 3KASMC18HE3_A/I
- Part No.:
- 3KASMC18HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18HE3_A/I.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,541
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Product details
Overview
3KASMC18HE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for high-reliability overvoltage protection in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 29.2 V under 103 A surge, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and ICs against inductive switching transients in engine control units.
For engineers reviewing the 3KASMC18HE3_A/I datasheet, 3KASMC18HE3_A/I pinout, 3KASMC18HE3_A/I application, or 3KASMC18HE3_A/I equivalent, key selection criteria include its DO-214AB (SMC) package compatibility, AEC-Q101 qualification, 18 V stand-off voltage, low 1.0 μA leakage at VWM, and verified thermal resistance (RθJA = 77.5 °C/W) for board-level thermal design validation.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping performance across -65 °C to +185 °C operating range. Its unidirectional polarity and 20.0–22.1 V breakdown voltage (VBR) at 1.0 mA ensure precise triggering above nominal 18 V rail voltage while maintaining low leakage.
The device meets MSL Level 1 per J-STD-020 with 260 °C reflow peak, features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is qualified to AEC-Q101 for automotive under-hood applications requiring long-term reliability under thermal cycling and surge stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before conduction; defines safe operating margin for 12 V automotive systems. |
| VBR (min/max) | 20.0 V / 22.1 V at 1.0 mA - Confirmed breakdown threshold ensures reliable turn-on during transients without false triggering. |
| PPPM | 3000 W (10/1000 μs) - Sustains high-energy surges common in motor drive and solenoid switching without failure. |
| VC @ IPPM | 29.2 V at 103 A - Clamping voltage limits downstream component stress to safe levels during worst-case surge events. |
| TJ max | +185 °C - Enables placement near heat sources (e.g., power converters) without derating concerns in engine control modules. |
| RθJA | 77.5 °C/W - Predictable junction-to-ambient thermal rise supports thermal modeling on standard FR-4 PCBs with minimum pad layout. |
| AEC-Q101 | Qualified - Validated for automotive use including temperature cycling, humidity bias, and surge lifetime testing per stress test plan. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode indicated by color band. Dimensions: 6.22 mm × 5.59 mm × 2.41 mm (L × W × H); RoHS-compliant, UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; completes clamping loop during transient events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 12 V supply rail); absorbs positive-going transients toward ground. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and leakage over 15+ year automotive life. |
| Peak pulse power | 3000 W (10/1000 μs) enables single-device protection of 12 V CAN bus power lines and LIN transceivers. |
| Clamping ratio | VC/VBR ≈ 1.37 - Low ratio minimizes overvoltage overshoot during fast transients (<1 ns response). |
| Thermal reliability | 185 °C TJ rating allows operation in under-hood ECUs without external heatsinking or derating. |
| Manufacturing compliance | MSL Level 1, JESD 201 Class 2 whisker resistance, and matte tin plating ensure assembly yield and long-term solder joint integrity. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Supply |
|---|---|
Use Scenario: Protection of 12 V microcontroller power rail against load dump and alternator ripple in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and LDO input to limit voltage excursions to ≤29.2 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic cores during ISO 7637-2 Pulse 5a (load dump) events. |
Use Scenario: Safeguarding gate driver ICs and bootstrap capacitors in 3-phase IGBT inverters subjected to inductive kickback. IC Role / Device Role / Timing Role: Fast-response surge suppressor across DC bus rails to absorb energy from flyback diodes and snubbers. Use Value: Eliminates need for additional RC snubbers by clamping transients within 1 ns, reducing BOM count and board space. |
| Telecom Base Station Power Interface | Consumer Appliance Mainboard 24 V Rail |
Use Scenario: Input-stage protection for remote radio head (RRH) power supplies exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary front-end TVS on 24 V/48 V DC input, coordinated with upstream fuses and secondary filtering. Use Value: Withstands repeated 3000 W surges per IEC 61000-4-5 Level 4, extending field service life beyond 10 years. |
Use Scenario: Overvoltage suppression on smart appliance mainboard 24 V auxiliary rail powering display backlight and sensor clusters. IC Role / Device Role / Timing Role: Standoff-rated protector placed after bulk capacitor to prevent overvoltage propagation during relay coil de-energization. Use Value: Maintains <1.0 μA leakage at 18 V, avoiding standby current penalties while delivering full 3000 W surge capability. |
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 | Lower PPPM (400 W), smaller SMA package, VC = 29.2 V at 13.7 A - less robust for high-current transients. | Targeted at consumer-grade 12 V interfaces; lacks AEC-Q101 qualification and 185 °C rating. | Select when cost and board space outweigh automotive reliability requirements. |
| SMCJ18A | Same DO-214AB package and 3000 W rating, but VBR = 20.0–22.2 V and VC = 29.2 V - functionally identical clamping behavior. | Also AEC-Q101 qualified; differs only in marking code and packaging suffix (e.g., HM3 vs. HM3_A/I). | Valid alternative if lead time or tape-and-reel configuration (3500 pcs/reel) better matches production planning needs. |
Compared with SMAJ18A and SMCJ18A, the 3KASMC18HE3_A/I provides identical electrical clamping performance and automotive qualification but offers traceable lot-level compliance documentation and optimized thermal resistance (77.5 °C/W) for high-density layouts where ambient temperature exceeds 105 °C.
Availability
3KASMC18HE3_A/I is available at Aetrix Electronics and suitable for automotive ECU designs, industrial motor drives, telecom power interfaces, and consumer appliance mainboards requiring stable component supply with full AEC-Q101 traceability and 13″ tape-and-reel delivery.
Supply support for 3KASMC18HE3_A/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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMC series was engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive power systems, emphasizing thermal stability, surge endurance, and long-term parametric consistency.
FAQ
What is the maximum clamping voltage of the 3KASMC18HE3_A/I under peak surge conditions?
The 3KASMC18HE3_A/I clamps to a maximum of 29.2 V when subjected to its rated 103 A peak pulse current (IPPM) using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 05-Mar-13, ensuring predictable overvoltage limiting for downstream 3.3 V or 5 V logic components in the 3KASMC18HE3_A/I protection circuit.
Is the 3KASMC18HE3_A/I suitable for automotive under-hood applications?
Yes, the 3KASMC18HE3_A/I is AEC-Q101 qualified and rated for operation up to +185 °C junction temperature, making it suitable for under-hood automotive applications such as engine control units and transmission control modules. Its DO-214AB package, MSL Level 1 rating, and passivated junction structure meet stringent automotive reliability requirements defined in the 3KASMC18HE3_A/I datasheet.
What does the "_A/I" suffix indicate in the 3KASMC18HE3_A/I part number?
The "_A/I" suffix in 3KASMC18HE3_A/I denotes a specific packaging configuration: "A" indicates the base P/NHM3 variant (RoHS-compliant and AEC-Q101 qualified), and "I" specifies 13″ diameter plastic tape-and-reel delivery with 3500 units per reel. This matches the ordering information table in the Vishay document 89962, confirming the 3KASMC18HE3_A/I is supplied in high-volume production-ready format.
How does the thermal resistance of the 3KASMC18HE3_A/I affect PCB layout?
The 3KASMC18HE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W when mounted on the minimum recommended pad layout. This means designers must allocate sufficient copper area and avoid thermal isolation to maintain junction temperature below 185 °C - especially critical in compact automotive modules where ambient temperatures exceed 105 °C and the 3KASMC18HE3_A/I may experience repeated surge events.
Does the 3KASMC18HE3_A/I have bidirectional or unidirectional polarity?
The 3KASMC18HE3_A/I is unidirectional only, as explicitly stated in the Vishay datasheet's FEATURES section. Its cathode is marked by a color band, and it conducts only during positive transients on the cathode side relative to anode - making it appropriate for protecting positive power rails like 12 V or 24 V supplies, unlike bidirectional TVS devices used for AC or data-line protection.
3KASMC18HE3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 93.2A
- 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 (SMCJ)
3KASMC18HE3_A/I FAQ
1.How can I place an order for 3KASMC18HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18HE3_A/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 3KASMC18HE3_A/I reliable?
The price and inventory of 3KASMC18HE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC18HE3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC18HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18HE3_A/I?
3KASMC18HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18HE3_A/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 3KASMC18HE3_A/I?
For technical support, including 3KASMC18HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18HE3_A/I requirements.
6.How does Aetrix verify that 3KASMC18HE3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC18HE3_A/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 3KASMC18HE3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC18HE3_A/I?
All 3KASMC18HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18HE3_A/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 3KASMC18HE3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC18HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC18HE3_A/I Tags
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