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Vishay General Semiconductor - Diodes Division 3KASMC12AHM3_B/I
- Part No.:
- 3KASMC12AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12AHM3_B/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,013
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Product details
Overview
3KASMC12AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in SMC (DO-214AB) package, rated for 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown (VBR), 3000 W peak pulse power (10/1000 μs), and 185 °C maximum junction temperature. It protects automotive sensor signal lines against inductive switching transients.
For engineers reviewing the 3KASMC12AHM3_B/I datasheet, 3KASMC12AHM3_B/I pinout, 3KASMC12AHM3_B/I application, or 3KASMC12AHM3_B/I equivalent, key selection criteria include clamping voltage (VC = 19.9 V at IPPM), low incremental surge resistance, AEC-Q101 qualification, halogen-free RoHS compliance, and MSL Level 1 rating.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to deliver stable clamping under high-temperature operation up to TJ = 185 °C. Its unidirectional polarity and 10/1000 μs waveform response enable robust protection of sensitive IC inputs during load dump or ESD events.
The device exhibits low thermal resistance (RθJL = 18.3 °C/W) and meets JESD201 Class 2 whisker testing. Its 19.9 V clamping voltage at rated IPPM ensures tight overvoltage control for 12 V rail interfaces without compromising system margin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/typ/max) | 13.3 / 14.0 / 14.7 V - Breakdown threshold at 1 mA test current; defines turn-on precision |
| VC @ IPPM | 19.9 V - Clamping voltage at peak pulse current; determines protected circuit's max stress level |
| PPPM | 3000 W - Peak pulse power handling with 10/1000 μs waveform; supports automotive load-dump immunity |
| TJ max. | +185 °C - Enables use in under-hood automotive environments without derating |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.11 mm x 6.60 mm body and 3.20 mm lead spacing |
| AEC-Q101 | Qualified - Confirmed reliability for automotive electronics per stress-test standard |
Pinout & Package
Package: SMC (DO-214AB), molded case with matte tin-plated leads, cathode indicated by color band. Complies with UL 94 V-0 flammability rating and J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or low-side reference | Provides return path during clamping; must be routed with low-inductance layout to minimize overshoot |
| Cathode | Current exit terminal in forward bias; connected to protected line | Receives transient energy from signal/power line; marked by visible band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable VBR drift < ±0.074 %/°C and long-term reliability under thermal cycling |
| 3000 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 5a load-dump surges in 12 V automotive systems |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without preconditioning or special handling |
| Halogen-free, RoHS-compliant (HM3 suffix) | Fulfills automotive OEM environmental mandates and simplifies end-of-life material reporting |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during fast transients, reducing risk of downstream IC latch-up |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from inductive kickback in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground to clamp transients before they reach the IC input stage. Use Value: 19.9 V clamping ensures signal integrity remains within 12 V system tolerance while surviving 3000 W pulses. | Use Scenario: Shielding digital input modules in programmable logic controllers from relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Standoff-rated suppression element on 24 V DC input channels, absorbing repetitive switching surges. Use Value: 185 °C junction rating allows uninterrupted operation in enclosed control cabinets with ambient temperatures up to 105 °C. |
| Consumer Power Adapter Input | Telecom Line Interface Protection |
Use Scenario: Safeguarding primary-side controller ICs in AC-DC adapters against lightning-induced surges on mains input. IC Role / Device Role / Timing Role: First-stage transient suppressor across bridge rectifier output, limiting voltage to downstream SMPS controller. Use Value: 3000 W capability handles IEC 61000-4-5 Level 3 (2 kV) surges with margin, while SMC footprint enables compact board layout. | Use Scenario: Protecting Ethernet PHY interface pins and PoE detection circuitry from ESD and induced surges on RJ45 ports. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on differential pairs, referenced to local ground plane. Use Value: Fast response time and 19.9 V clamping prevent PHY latch-up during 8 kV contact ESD events per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12AHE3_A/H | Same SMC package, lower PPPM (400 W), higher VC (20.1 V), non-AEC-Q101 | Rated for commercial/industrial use only; not qualified for automotive under-hood deployment | Select when cost sensitivity outweighs automotive qualification and surge margin requirements |
| SMCJ12AHE3_A/H | Same SMC package, higher PPPM (1500 W), same VWM/VBR range, AEC-Q101 qualified | Lacks 3000 W capability needed for severe load-dump scenarios (e.g., ISO 7637-2 Pulse 5a) | Choose where moderate surge immunity suffices and 3KASMC12AHM3_B/I's full 3000 W headroom is unnecessary |
Compared with SMAJ12AHE3_A/H and SMCJ12AHE3_A/H, the 3KASMC12AHM3_B/I delivers 2× higher peak pulse power than SMCJ12AHE3_A/H and full AEC-Q101 qualification unlike SMAJ12AHE3_A/H-making it the only option meeting both automotive-grade reliability and 3000 W surge immunity in SMC form factor.
Availability
3KASMC12AHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer power adapter inputs, and telecom line interface protection requiring stable component supply across extended temperature and surge conditions.
Supply support for 3KASMC12AHM3_B/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, MOSFETs, and protection devices with emphasis on high-reliability and automotive-grade performance.
The 3KASMC series is designed specifically for high-energy transient suppression in harsh automotive and industrial environments, combining AEC-Q101 qualification, 185 °C operation, and 3000 W pulse capability in standardized SMC packaging.
FAQ
What is the clamping voltage of the 3KASMC12AHM3_B/I at its rated peak pulse current?
The 3KASMC12AHM3_B/I has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPPM), measured under 10/1000 μs waveform conditions. This value ensures protected circuits remain within safe voltage margins during high-energy transients. The 3KASMC12AHM3_B/I's low clamping ratio (VC/VBR ≈ 1.42) reflects its efficient energy diversion capability without excessive overshoot.
Is the 3KASMC12AHM3_B/I qualified for automotive applications?
Yes, the 3KASMC12AHM3_B/I is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix "HM3". It meets the stress-test requirements for automotive electronics including high-temperature operation up to TJ = 185 °C and mechanical robustness per JESD201 Class 2. The 3KASMC12AHM3_B/I is explicitly intended for under-hood and chassis-mounted systems.
What does the "HM3" suffix indicate in 3KASMC12AHM3_B/I?
The "HM3" suffix in 3KASMC12AHM3_B/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from "HE3" (RoHS-compliant and AEC-Q101 qualified but not halogen-free) and confirms compliance with automotive OEM environmental mandates. The 3KASMC12AHM3_B/I's HM3 designation also verifies JESD201 Class 2 whisker resistance and MSL Level 1 reflow compatibility.
What is the thermal resistance from junction to leads for the 3KASMC12AHM3_B/I?
The 3KASMC12AHM3_B/I has a typical thermal resistance from junction to leads (RθJL) of 18.3 °C/W, enabling effective heat transfer to PCB copper during high-current transient events. This parameter supports reliable operation at elevated ambient temperatures and informs thermal pad layout design. The 3KASMC12AHM3_B/I's RθJL value is specified under standard mounting conditions per Vishay's datasheet Figure 6.
How does the 3KASMC12AHM3_B/I differ from the 3KASMC12AHE3_B/I?
The 3KASMC12AHM3_B/I uses halogen-free molding compound and meets additional environmental requirements beyond RoHS, whereas the 3KASMC12AHE3_B/I is RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both share identical electrical specs, package, and thermal ratings. The 3KASMC12AHM3_B/I is selected when halogen-free compliance is mandated by automotive OEMs or regional regulations.
3KASMC12AHM3_B/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):
- 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 (SMC)
3KASMC12AHM3_B/I FAQ
1.How can I place an order for 3KASMC12AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12AHM3_B/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 3KASMC12AHM3_B/I reliable?
The price and inventory of 3KASMC12AHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC12AHM3_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC12AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12AHM3_B/I?
3KASMC12AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12AHM3_B/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 3KASMC12AHM3_B/I?
For technical support, including 3KASMC12AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12AHM3_B/I requirements.
6.How does Aetrix verify that 3KASMC12AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC12AHM3_B/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 3KASMC12AHM3_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC12AHM3_B/I?
All 3KASMC12AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12AHM3_B/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 3KASMC12AHM3_B/I part is unused and in its original packaging.
Return procedure for 3KASMC12AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC12AHM3_B/I Tags
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