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Vishay General Semiconductor - Diodes Division 5KASMC18AHM3_A/I
- Part No.:
- 5KASMC18AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
5KASMC18AHM3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,926
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Product details
Overview
5KASMC18AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) designed for high-reliability automotive and industrial overvoltage protection. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 5000 W peak pulse power (10/1000 μs), 171.2 V clamping voltage at 171.2 A surge current, and operates up to TJ = 185 °C in SMC (DO-214AB) package.
For engineers reviewing the 5KASMC18AHM3_A/I datasheet, 5KASMC18AHM3_A/I pinout, 5KASMC18AHM3_A/I application, or 5KASMC18AHM3_A/I equivalent, key selection criteria include unidirectional clamping performance under 10/1000 μs transients, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, and thermal resistance (RθJA = 100 °C/W) for board-level reliability validation.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for junction stability at elevated temperatures. Its design supports transient suppression in automotive powertrain and ADAS sensor interfaces where sustained operation at TJ = 185 °C and fast response to inductive switching events are required.
The device delivers low incremental surge resistance and excellent clamping ratio (VC/VBR ≈ 8.2) under standardized 10/1000 μs pulses. It meets JESD22-B102 solderability and JESD201 Class 2 whisker resistance requirements, with matte tin-plated terminals and UL 94 V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/typ/max) | 20.0 / 21.1 / 22.1 V at 1 mA - precise breakdown threshold for predictable clamping onset |
| VC @ IPPM | 29.2 V at 171.2 A - clamping voltage limiting downstream circuit stress during 5000 W surge |
| PPPM (10/1000 μs) | 5000 W - peak transient energy handling capability per industry-standard waveform |
| TJ max. | +185 °C - enables deployment in under-hood automotive environments without derating |
| Package | SMC (DO-214AB) - standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case with matte tin-plated leads; cathode indicated by color band; compliant with JEDEC DO-214AB mechanical dimensions and IPC-7351B land pattern recommendations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during clamping | Connected to protected line (e.g., 12 V rail or signal trace); conducts surge current to ground path |
| Cathode | Current source during clamping | Connected to system ground or low-impedance return; polarity marking ensures correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR and leakage across temperature and lifetime |
| High-temperature operation | TJ = 185 °C rating allows placement near heat sources without thermal derating in engine control units |
| Low clamping ratio | VC/VBR ≈ 1.38 enables tighter voltage margin for 24 V automotive systems with 30 V transients |
| MSL Level 1 | Reflow-compatible up to 260 °C peak without baking, simplifying SMT assembly for high-volume production |
| Halogen-free & RoHS | HM3 suffix confirms compliance with environmental regulations and material categorization per Vishay Doc. 99912 |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power rails in body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps 5000 W transients to ≤29.2 V, preventing damage to downstream PMICs and microcontrollers rated for 36 V absolute max. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential signal lines upstream of instrumentation amplifier inputs. Use Value: Sub-100 ps response time limits voltage overshoot to <30 V, preserving signal integrity and ADC accuracy in 16-bit measurement systems. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding AC-DC adapter primary-side rectifiers and secondary-side 48 V PoE circuits from lightning-induced surges. IC Role / Device Role / Timing Role: Primary-side TVS across bulk capacitor input to absorb common-mode transients before isolation barrier. Use Value: 5000 W rating handles IEC 61000-4-5 Level 4 (4 kV) surges while maintaining RθJA = 100 °C/W for thermal stability in enclosed enclosures. | Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: Freewheeling TVS across motor terminals to clamp flyback voltage during PWM commutation. Use Value: 171.2 A peak surge current capacity accommodates 200 ms motor stall events without degradation, verified per AEC-Q101 HBM and CDM tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM and VBR range | Not AEC-Q101 qualified; limited to consumer/industrial use below 150 °C junction temp | Select when space-constrained layouts require smaller footprint and automotive qualification is unnecessary |
| 5.0SMDJ18A | Same PPPM (5000 W), larger SMC-like package (DO-214AB), but higher RθJA (125 °C/W) and no AEC-Q101 certification | Lacks automotive qualification and high-temp reliability data; intended for telecom/commercial power supplies | Choose only if cost sensitivity outweighs need for AEC-Q101 validation and 185 °C operation |
Compared with SMBJ18A and 5.0SMDJ18A, the 5KASMC18AHM3_A/I provides superior thermal robustness (TJ = 185 °C), automotive qualification, and lower thermal resistance-making it the sole option for under-hood automotive ECUs requiring long-term reliability under thermal cycling and humidity exposure.
Availability
5KASMC18AHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom power supply input, and consumer appliance motor drive protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for 5KASMC18AHM3_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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, precision, and high-temperature performance.
The 5KASMCxxA family was engineered specifically for automotive and industrial transient suppression, combining PAR® technology with AEC-Q101 qualification and extended junction temperature capability to replace legacy TVS solutions in harsh-environment applications.
FAQ
What is the clamping voltage of the 5KASMC18AHM3_A/I at its rated peak pulse current?
The 5KASMC18AHM3_A/I has a maximum clamping voltage (VC) of 29.2 V at its peak pulse current (IPPM) of 171.2 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay Document 89432 and reflects the actual voltage seen by protected circuitry during worst-case surge events. The 5KASMC18AHM3_A/I maintains this clamping performance across its full operating temperature range.
Is the 5KASMC18AHM3_A/I qualified for automotive applications?
Yes, the 5KASMC18AHM3_A/I is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (Document 89432, Revision 19-Jan-2024). It undergoes rigorous stress testing-including high-temperature reverse bias, temperature cycling, and ESD-to meet automotive reliability standards. The 5KASMC18AHM3_A/I is approved for use in engine control units, body electronics, and ADAS sensor modules.
What does the "HM3_A/I" suffix indicate in 5KASMC18AHM3_A/I?
The "HM3" denotes halogen-free, RoHS-compliant construction meeting Vishay's material categorization standard (Doc. 99912); "A" is the revision code; "I" specifies packaging in 13-inch tape-and-reel format with 3500 units per reel. The 5KASMC18AHM3_A/I thus guarantees environmental compliance, traceable revision control, and high-volume SMT compatibility.
How does the thermal resistance of the 5KASMC18AHM3_A/I affect PCB layout?
The 5KASMC18AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended pad layout. To maintain TJ ≤ 185 °C under 6.5 W steady-state dissipation, designers must provide adequate copper area and thermal vias. The 5KASMC18AHM3_A/I datasheet specifies exact pad dimensions (7.75 mm × 6.22 mm) to achieve this rating.
Can the 5KASMC18AHM3_A/I be used in bidirectional configurations?
No, the 5KASMC18AHM3_A/I is unidirectional only, as confirmed in the Vishay datasheet Features section. It conducts surge current from cathode to anode during positive transients on the cathode side. For bidirectional protection, two 5KASMC18AHM3_A/I devices must be connected in series opposition-or a dedicated bidirectional TVS such as SMAJ18CA should be selected instead.
5KASMC18AHM3_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:
- 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):
- 171.2A
- Power - Peak Pulse:
- 5000W (5kW)
- 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)
5KASMC18AHM3_A/I FAQ
1.How can I place an order for 5KASMC18AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 5KASMC18AHM3_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 5KASMC18AHM3_A/I reliable?
The price and inventory of 5KASMC18AHM3_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 5KASMC18AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 5KASMC18AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KASMC18AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5KASMC18AHM3_A/I?
5KASMC18AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5KASMC18AHM3_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 5KASMC18AHM3_A/I?
For technical support, including 5KASMC18AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KASMC18AHM3_A/I requirements.
6.How does Aetrix verify that 5KASMC18AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 5KASMC18AHM3_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 5KASMC18AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 5KASMC18AHM3_A/I?
All 5KASMC18AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 5KASMC18AHM3_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 5KASMC18AHM3_A/I part is unused and in its original packaging.
Return procedure for 5KASMC18AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
5KASMC18AHM3_A/I Tags
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