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Vishay General Semiconductor - Diodes Division 3KASMC18AHE3_A/H
- Part No.:
- 3KASMC18AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18AHE3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,131
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Product details
Overview
3KASMC18AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for high-energy surge 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 current, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and ICs against inductive switching transients.
For engineers reviewing the 3KASMC18AHE3_A/H datasheet, 3KASMC18AHE3_A/H pinout, 3KASMC18AHE3_A/H application, or 3KASMC18AHE3_A/H equivalent, this device is selected for high-reliability DC bus protection where AEC-Q101 qualification, low clamping voltage, and MSL Level 1 solderability are mandatory design requirements.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable breakdown behavior and low incremental surge resistance. Its unidirectional polarity and 18 V stand-off voltage (VWM) make it suitable for protecting positive-rail circuits against reverse-biased surges without forward conduction during normal operation.
The device is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits 77.5 °C/W junction-to-ambient thermal resistance on standard PCB pads. Its DO-214AB (SMC) package supports automated assembly and meets UL 94 V-0 flammability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR (min/max) | 20.0 V / 22.1 V at 1.0 mA - Confirmed breakdown threshold range ensures consistent turn-on across production lots. |
| VC @ IPPM | 29.2 V at 103 A - Clamping voltage under full 3000 W surge; limits protected circuit stress to ≤29.2 V. |
| PPPM | 3000 W (10/1000 µs) - Peak surge energy handling capacity compatible with ISO 7637-2 Pulse 5a/b automotive load dump tests. |
| TJ max | +185 °C - Enables deployment in engine bay or under-hood locations without derating penalties. |
| IR @ VWM | 1.0 µA - Ultra-low leakage preserves battery life in always-on automotive modules. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode indicated by color band. RoHS-compliant matte tin-plated leads, MSL Level 1, LF peak 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path | Connected to system ground or low-side reference; carries full surge current during clamping. |
| Cathode | Protected line connection | Connected to the rail being protected (e.g., 24 V supply); voltage referenced to anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Stabilizes VBR over temperature and lifetime, reducing parameter drift in harsh environments. |
| 10/1000 µs waveform rating | 3000 W capability matches industry-standard surge test profiles for automotive and industrial equipment. |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage exposure to downstream components compared to higher-ratio TVS devices. |
| MSL Level 1 rating | Enables direct placement on reflow lines without baking or special handling prior to assembly. |
| Uni-directional polarity | Prevents unintended forward conduction on negative transients while maintaining optimal clamping on positive surges. |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤29.2 V during 3000 W surges, preventing damage to upstream regulators and microcontrollers. |
Use Scenario: Safeguarding analog input channels of programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on sensor signal conditioning front-end. Use Value: Provides sub-30 V clamping with <1 µA leakage, preserving signal integrity and minimizing offset errors. |
| Motor Drive Gate Driver Protection | Telecom DC Power Interface |
Use Scenario: Shielding high-side gate drivers in BLDC inverters from shoot-through-induced voltage spikes. IC Role / Device Role / Timing Role: Rail-to-rail TVS connected across gate driver VDD and GND pins. Use Value: Responds in <1 ns to clamp spikes before gate oxide breakdown occurs, supporting 185 °C ambient operation. |
Use Scenario: Protecting -48 V telecom power feeds from lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional TVS on negative rail, cathode tied to -48 V, anode to system ground. Use Value: Delivers 3000 W surge handling with verified AEC-Q101 reliability, meeting GR-1089-CORE surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/5T | Lower PPPM (400 W), same DO-214AC (SMA) package, VWM = 18 V, VC = 29.2 V at 13.7 A | Not suitable for automotive load dump; limited to lower-energy surges in consumer or office equipment | Select when cost sensitivity outweighs surge energy requirement and board space allows larger SMC footprint |
| 1.5KE18A | Through-hole TO-218 package, PPPM = 1500 W, VWM = 15.3 V, VC = 27.7 V at 54.3 A | Lacks AEC-Q101 qualification and MSL Level 1; unsuitable for automated SMT production | Choose only for legacy through-hole designs where rework tolerance and manual assembly are acceptable |
Compared with SMAJ18A-E3/5T and 1.5KE18A, the 3KASMC18AHE3_A/H provides triple the surge power handling, automotive qualification, and surface-mount process compatibility - making it the sole option among the three for new AEC-Q101-compliant 24 V power rail designs requiring >1 kW surge immunity.
Availability
3KASMC18AHE3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor controls, and telecom power interface designs requiring stable component supply, AEC-Q101 compliance, and high-temperature surge resilience.
Supply support for 3KASMC18AHE3_A/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, and protection devices with emphasis on reliability, thermal performance, and automotive qualification.
The 3KASMCxxA family was engineered specifically for high-temperature, high-energy transient suppression in automotive power distribution and industrial automation - delivering AEC-Q101 qualified TVS performance in compact SMC packages.
FAQ
What is the maximum clamping voltage of the 3KASMC18AHE3_A/H under full-rated surge current?
The 3KASMC18AHE3_A/H clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 103 A (10/1000 µs waveform). This value is measured and guaranteed per the Vishay datasheet Document Number 89962, ensuring predictable overvoltage limiting for downstream components in 24 V systems.
Is the 3KASMC18AHE3_A/H qualified for automotive applications?
Yes, the 3KASMC18AHE3_A/H is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias, temperature cycling, and accelerated life testing. Its 185 °C maximum junction temperature and MSL Level 1 rating further validate its suitability for under-hood and powertrain-related automotive subsystems.
What does the "_A/H" suffix indicate in the 3KASMC18AHE3_A/H part number?
The "_A/H" suffix in 3KASMC18AHE3_A/H denotes a specific packaging configuration: 7-inch diameter plastic tape and reel, with base quantity 850 units per reel. The "H" code corresponds to the preferred package code defined in Vishay's ordering information table, distinct from "I" (13-inch reel) or "57T" (7-inch reel with different orientation).
Can the 3KASMC18AHE3_A/H be used in bidirectional surge protection circuits?
No, the 3KASMC18AHE3_A/H is unidirectional only, as explicitly stated in the Vishay datasheet. It protects against positive-going transients on the cathode side relative to the anode. For bidirectional protection, two devices must be connected in series opposing configuration, or a dedicated bidirectional TVS such as SMBJ18CA should be selected instead.
What is the thermal resistance of the 3KASMC18AHE3_A/H in standard mounting conditions?
The 3KASMC18AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W when mounted on the minimum recommended pad layout per the Vishay datasheet. This value assumes no heatsink and standard FR-4 PCB copper area; actual thermal performance improves with enhanced copper pour or thermal vias.
3KASMC18AHE3_A/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:
- Obsolete
- 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 (SMCJ)
3KASMC18AHE3_A/H FAQ
1.How can I place an order for 3KASMC18AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18AHE3_A/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_A/H reliable?
The price and inventory of 3KASMC18AHE3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC18AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18AHE3_A/H?
3KASMC18AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18AHE3_A/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_A/H?
For technical support, including 3KASMC18AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18AHE3_A/H requirements.
6.How does Aetrix verify that 3KASMC18AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC18AHE3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC18AHE3_A/H?
All 3KASMC18AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18AHE3_A/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_A/H part is unused and in its original packaging.
Return procedure for 3KASMC18AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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