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Vishay General Semiconductor - Diodes Division 3KASMC12AHM3_A/H
- Part No.:
- 3KASMC12AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12AHM3_A/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,978
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Product details
Overview
3KASMC12AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown (VBR), 3000 W peak pulse power (10/1000 μs), 151 A peak surge current (IPPM), and 19.9 V clamping voltage (VC) - deployed for automotive sensor line protection against inductive switching transients.
For engineers reviewing the 3KASMC12AHM3_A/H datasheet, 3KASMC12AHM3_A/H pinout, 3KASMC12AHM3_A/H application, or 3KASMC12AHM3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, TJ = 185 °C operation, MSL Level 1 rating, and DO-214AB thermal performance under high-reliability automotive and industrial surge conditions.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under repetitive surge stress at junction temperatures up to +185 °C. Its low incremental surge resistance and fast response time ensure effective suppression of transient energy before downstream ICs or MOSFETs are damaged.
The device operates exclusively in unidirectional mode with cathode band marking, meets JESD201 Class 2 whisker resistance, and is qualified per AEC-Q101 - confirming suitability for automotive powertrain and body electronics where reliability under thermal cycling and humidity is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - guaranteed breakdown threshold defining turn-on precision |
| PPPM | 3000 W (10/1000 μs) - peak transient energy absorption capacity without failure |
| VC @ IPPM | 19.9 V at 151 A - clamped voltage seen by protected circuit during worst-case surge |
| TJ max. | +185 °C - enables operation in under-hood automotive environments without derating |
| IFSM | 200 A (8.3 ms half-sine) - surge current handling capability for short-duration overloads |
| RθJA | 77.5 °C/W - thermal resistance from junction to ambient on standard PCB pad layout |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, RoHS-compliant, MSL Level 1 (260 °C peak reflow), cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during forward surge events |
| Cathode | Clamping terminal | Marked with color band; referenced to system ground or higher potential rail during reverse transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and leakage over lifetime and temperature |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTGB, TCT, and H3TRB stress testing |
| MSL Level 1 | Supports standard SMT reflow without moisture-induced popcorning or delamination |
| Low clamping ratio (VC/VBR) | 1.41 typical - tight voltage margin between breakdown and clamping improves system-level protection margin |
| High-temperature stability | Full electrical specs guaranteed from –65 °C to +185 °C junction temperature |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor signal lines (e.g., throttle position, oxygen sensors) from load-dump and inductive kickback in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed directly at connector or IC input pins to shunt transient energy to ground before it reaches sensitive analog front-ends. Use Value: Prevents latch-up or permanent damage in automotive microcontrollers and transceivers while maintaining signal integrity under ISO 7637-2 Pulse 1/2a/5a conditions. |
Use Scenario: Safeguarding PLC I/O modules and motor driver enable/disable inputs against back-EMF from solenoids, relays, and brushed DC motors. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across control inputs to absorb repetitive 3000 W surges without degradation over >10⁵ cycles. Use Value: Eliminates need for external snubbers or RC networks while sustaining full 185 °C junction operation in enclosed industrial enclosures. |
| Telecom Power Supply Rails | Computer Peripheral Interfaces |
Use Scenario: Clamping 48 V telecom power rails against lightning-induced surges entering via Ethernet or PoE interfaces. IC Role / Device Role / Timing Role: Primary-level unidirectional suppressor mounted at board edge to divert bulk surge energy before DC-DC converters. Use Value: Achieves UL 60950-1 and IEC 61000-4-5 Level 4 compliance with single-device solution and no derating above 85 °C ambient. |
Use Scenario: Protecting USB 2.0 data lines and HDMI hot-plug detection circuits from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 200 pF at 0 V) placed inline with differential pairs to limit voltage without signal distortion. Use Value: Meets IEC 61000-4-2 ±15 kV contact discharge requirement while preserving signal rise/fall times below 1 ns. |
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 VWM (12 V), DO-214AC (SMA) package, RθJA = 110 °C/W | Limited to consumer-grade or low-energy industrial use; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive reliability or surge energy requirements |
| SMCJ12A | Same PPPM (3000 W), identical DO-214AB package, but VBR min = 13.3 V (same), TJ max = 175 °C (10 °C lower) | Approved for non-automotive industrial use; lacks AEC-Q101 certification and 185 °C validation | Choose if AEC-Q101 is not required and thermal margin above 175 °C is not needed |
Compared with SMAJ12A and SMCJ12A, the 3KASMC12AHM3_A/H delivers higher junction temperature capability (+185 °C), formal AEC-Q101 qualification, and tighter clamping performance - making it the only option validated for under-hood automotive deployment where thermal and reliability margins are non-negotiable.
Availability
3KASMC12AHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial motor drive inputs, telecom power supply rails, and computer peripheral interfaces requiring stable component supply across extended temperature and surge life cycles.
Supply support for 3KASMC12AHM3_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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMC12AHM3_A/H belongs to Vishay's PAR® family of high-power surface-mount TVS diodes engineered specifically for AEC-Q101-compliant automotive electronics and harsh-environment industrial systems.
FAQ
What is the clamping voltage of the 3KASMC12AHM3_A/H at its rated peak pulse current?
The 3KASMC12AHM3_A/H has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPPM) of 151 A, measured using the standardized 10/1000 μs waveform. This value ensures protected circuits experience minimal overvoltage during transient events, and it is guaranteed across the full operating temperature range from –65 °C to +185 °C junction temperature.
Is the 3KASMC12AHM3_A/H qualified for automotive applications?
Yes, the 3KASMC12AHM3_A/H is AEC-Q101 qualified and explicitly designed for automotive use. It passes all required stress tests including high-temperature gate bias (HTGB), temperature cycling (TCT), and highly accelerated temperature-humidity bias (H3TRB), and supports operation up to +185 °C junction temperature - meeting under-hood reliability requirements for modern vehicles.
What does the "HM3_A/H" suffix indicate in 3KASMC12AHM3_A/H?
The "HM3_A/H" suffix denotes the packaging configuration: HM3 indicates RoHS-compliant, AEC-Q101-qualified DO-214AB (SMC) packaging; "A" is the revision code; and "H" specifies 7-inch plastic tape-and-reel delivery with 850 units per reel. This matches Vishay's ordering convention defined in Document Number 89962.
Can the 3KASMC12AHM3_A/H replace the SMAJ12A in existing designs?
No direct replacement: the 3KASMC12AHM3_A/H has higher power rating (3000 W vs. 400 W), larger DO-214AB package (vs. DO-214AC), and AEC-Q101 qualification - requiring PCB layout review. While both share 12 V VWM, the 3KASMC12AHM3_A/H offers superior thermal and surge robustness but is not pin-compatible due to different footprint and thermal pad requirements.
What is the maximum reverse leakage current of the 3KASMC12AHM3_A/H at 12 V and 150 °C?
The 3KASMC12AHM3_A/H exhibits a maximum reverse leakage current (ID) of 20 μA at VWM = 12 V and TJ = 150 °C, as specified in the Electrical Characteristics table. This elevated leakage at high temperature remains well within safe limits for protecting downstream logic and analog circuits without causing unintended bias or power loss.
3KASMC12AHM3_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):
- 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)
3KASMC12AHM3_A/H FAQ
1.How can I place an order for 3KASMC12AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12AHM3_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 3KASMC12AHM3_A/H reliable?
The price and inventory of 3KASMC12AHM3_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 3KASMC12AHM3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC12AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12AHM3_A/H?
3KASMC12AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12AHM3_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 3KASMC12AHM3_A/H?
For technical support, including 3KASMC12AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12AHM3_A/H requirements.
6.How does Aetrix verify that 3KASMC12AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC12AHM3_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 3KASMC12AHM3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC12AHM3_A/H?
All 3KASMC12AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12AHM3_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 3KASMC12AHM3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC12AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC12AHM3_A/H Tags
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