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Vishay General Semiconductor - Diodes Division 3KASMC12AHE3_A/I
- Part No.:
- 3KASMC12AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12AHE3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,380
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Product details
Overview
3KASMC12AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at ≤19.9 V under 151 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 3KASMC12AHE3_A/I datasheet, 3KASMC12AHE3_A/I pinout, 3KASMC12AHE3_A/I application, or 3KASMC12AHE3_A/I equivalent, this page provides verified electrical specs, DO-214AB package details, AEC-Q101 qualification status, thermal resistance data, and real-world use cases in automotive sensor power lines and industrial motor drivers.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with optimized junction passivation for stable clamping performance across -65 °C to +185 °C. Its unidirectional polarity and 12 V stand-off voltage (VWM) target DC power rail protection where reverse conduction must be blocked during normal operation.
The device achieves low incremental surge resistance and fast response time to limit transient overvoltage before downstream components are stressed. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing, confirming suitability for lead-free reflow assembly in high-reliability production.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins; sets threshold for protection activation on 12 V systems. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - breakdown occurs within this range, ensuring reliable turn-on margin above VWM. |
| VC @ IPPM | 19.9 V at 151 A (10/1000 μs) - clamping voltage seen by protected circuit during worst-case surge; limits stress on downstream 20 V-rated components. |
| PPPM | 3000 W - peak pulse power handling capacity defines survivability against high-energy transients like ISO 7637-2 Pulse 5a. |
| TJ max. | +185 °C - enables placement near hot components (e.g., power MOSFETs, engine control units) without derating concerns. |
| RθJA | 77.5 °C/W - thermal resistance from junction to ambient; informs board-level heatsinking requirements for sustained power dissipation. |
| AEC-Q101 | Qualified - certified for automotive electronic modules per stress test standard, including HTRB, HTGB, and temperature cycling. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, RoHS-compliant, UL 94 V-0 molding compound. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; connected to system ground or low-side return path. | Provides low-VF path (<3.5 V at 100 A) for surge current diversion to ground during clamping events. |
| Cathode | Protected line connection; marked with color band. | Connected to the line being protected (e.g., 12 V battery rail); reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage and clamping performance over 1000+ hours at 150 °C, critical for under-hood automotive modules. |
| 185 °C junction rating | Supports operation in engine control units, transmission controllers, and industrial inverters without thermal derating penalties. |
| 3000 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 5a (load dump) surges up to 120 V/350 ms without failure when properly mounted. |
| AEC-Q101 qualification | Validates reliability for automotive safety-critical subsystems including ADAS camera power supplies and EPS motor drivers. |
| MSL Level 1, 260 °C peak reflow | Allows single-pass lead-free reflow assembly without moisture sensitivity concerns or pre-bake requirements. |
Applications
| Automotive Engine Control Unit (ECU) Power Rail | Industrial Motor Drive DC Bus Protection |
|---|---|
Use Scenario: Protecting 12 V supply input of ECU against load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and input filter capacitor. Use Value: Limits transient voltage to ≤19.9 V, preventing damage to MCU, CAN transceivers, and analog front-end ICs rated for 20 V absolute maximum. |
Use Scenario: Safeguarding IGBT gate driver power supply in variable-frequency drives exposed to inductive kickback from motor windings. IC Role / Device Role / Timing Role: Primary surge suppression element on +15 V auxiliary supply rail feeding isolated gate drivers. Use Value: Absorbs 151 A surge current within nanoseconds, maintaining gate drive integrity and avoiding false triggering or latch-up. |
| Automotive Camera Module Power Input | Telecom Remote Radio Unit (RRU) DC Feed |
Use Scenario: Shielding 12 V input of rear-view or surround-view camera modules from cable discharge events and ESD coupling. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of DC-DC converter and image sensor power domain. Use Value: Low clamping voltage ensures sensor and ISP ICs (typically 13.2 V abs max) remain within safe operating area during 3000 W surges. |
Use Scenario: Protecting 48 V DC feed lines in outdoor RRUs from lightning-induced surges entering via tower-mounted cabling. IC Role / Device Role / Timing Role: Secondary surge clamp on intermediate 12 V distribution rail powering RF amplifiers and FPGAs. Use Value: High-temperature stability allows mounting directly on metal heatsink chassis, improving thermal coupling and long-term reliability in uncooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Lower PPPM (400 W), same DO-214AC (SMA) package; 12 V VWM, 19.9 V VC @ 21.2 A. | Not qualified to AEC-Q101; limited to consumer/industrial non-automotive use. | Select SMAJ12A only for cost-sensitive, non-automotive designs where surge energy is <10% of 3KASMC12AHE3_A/I capability. |
| SMCJ12A | Same DO-214AB (SMC) package and 3000 W rating, but TJ max = 175 °C and no AEC-Q101 certification. | Lacks automotive qualification; suitable for industrial controls but not for OEM vehicle ECUs. | Choose SMCJ12A for industrial applications requiring identical form factor and power rating but without automotive compliance mandates. |
Compared with SMAJ12A and SMCJ12A, the 3KASMC12AHE3_A/I uniquely combines AEC-Q101 qualification, 185 °C operation, and DO-214AB packaging - making it the only option for under-hood automotive deployment where both reliability and thermal headroom are mandatory.
Availability
3KASMC12AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial motor drive DC bus safeguarding, and telecom RRU DC feed line surge suppression requiring stable component supply across multi-year production cycles.
Supply support for 3KASMC12AHE3_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 high-reliability and automotive-grade solutions.
The 3KASMC12AHE3_A/I belongs to Vishay's PAR® family of high-power TVS diodes engineered specifically for harsh-environment transient suppression in automotive powertrain, body electronics, and industrial automation systems.
FAQ
What is the clamping voltage of the 3KASMC12AHE3_A/I under full-rated surge current?
The 3KASMC12AHE3_A/I clamps at a maximum of 19.9 V when subjected to its rated peak pulse current of 151 A using the 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 20 V-tolerant downstream ICs.
Is the 3KASMC12AHE3_A/I suitable for automotive applications requiring AEC-Q101 qualification?
Yes, the 3KASMC12AHE3_A/I is explicitly AEC-Q101 qualified, as stated in the Vishay datasheet (Document Number: 89962). This certification covers stress tests including high-temperature reverse bias, temperature cycling, and accelerated life testing - validating its use in automotive engine control units, ADAS modules, and body control modules.
What package type does the 3KASMC12AHE3_A/I use, and what are its key mechanical features?
The 3KASMC12AHE3_A/I uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Its molding compound meets UL 94 V-0 flammability rating, and the cathode is marked by a visible color band - all confirmed in the mechanical data section of the official Vishay datasheet.
How does the 185 °C maximum junction temperature of the 3KASMC12AHE3_A/I impact system design?
The 185 °C TJ max rating of the 3KASMC12AHE3_A/I allows placement in high-temperature zones such as near power MOSFETs or inside engine compartments without thermal derating. This eliminates need for oversized heatsinks or remote placement, simplifying layout and improving protection responsiveness in automotive and industrial power systems.
What is the difference between the 3KASMC12AHE3_A/I and the base part number 3KASMC12A?
The 3KASMC12AHE3_A/I suffix indicates tape-and-reel packaging (I = 13-inch reel, 3500 units), RoHS compliance, and AEC-Q101 qualification - whereas 3KASMC12A alone denotes the bare die variant without packaging or qualification status. The "HE3" denotes Vishay's high-reliability process, and "_A/I" specifies the delivery format per Vishay's ordering nomenclature.
3KASMC12AHE3_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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 151A
- 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)
3KASMC12AHE3_A/I FAQ
1.How can I place an order for 3KASMC12AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12AHE3_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 3KASMC12AHE3_A/I reliable?
The price and inventory of 3KASMC12AHE3_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 3KASMC12AHE3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC12AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12AHE3_A/I?
3KASMC12AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12AHE3_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 3KASMC12AHE3_A/I?
For technical support, including 3KASMC12AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12AHE3_A/I requirements.
6.How does Aetrix verify that 3KASMC12AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC12AHE3_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 3KASMC12AHE3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC12AHE3_A/I?
All 3KASMC12AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12AHE3_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 3KASMC12AHE3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC12AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC12AHE3_A/I Tags
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