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Vishay General Semiconductor - Diodes Division 3KASMC12AHE3_B/H
- Part No.:
- 3KASMC12AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12AHE3_B/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,976
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Product details
Overview
3KASMC12AHE3_B/H 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 at 1 mA), 3000 W peak pulse power (10/1000 μs), and 185 °C maximum junction temperature - designed for automotive-grade overvoltage protection of power rails and signal lines in engine control units and ADAS sensor interfaces.
For engineers reviewing the 3KASMC12AHE3_B/H datasheet, 3KASMC12AHE3_B/H pinout, 3KASMC12AHE3_B/H application, or 3KASMC12AHE3_B/H equivalent, key selection criteria include clamping voltage (VC = 19.9 V at IPPM), low incremental surge resistance, AEC-Q101 qualification, RoHS compliance, and MSL Level 1 moisture sensitivity rating.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to deliver stable clamping under high-temperature transients up to TJ = 185 °C. Its unidirectional polarity and 12 V stand-off voltage make it suitable for DC power rail protection where reverse conduction must be blocked.
The device achieves 3000 W peak pulse power handling with a 10/1000 μs waveform and clamps at ≤19.9 V when subjected to its rated peak pulse current (IPPM = 151 A). Thermal resistance is characterized as RθJL = 18.3 °C/W (junction-to-leads), supporting robust surge energy dissipation in compact SMC layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/typ/max) | 13.3 / 14.0 / 14.7 V at 1 mA - ensures reliable turn-on margin above VWM for noise immunity |
| VC @ IPPM | 19.9 V at 151 A - defines worst-case protected circuit voltage during 3000 W surge |
| PPPM | 3000 W (10/1000 μs) - supports IEC 61000-4-5 Level 4 surge immunity in automotive systems |
| TJ max. | +185 °C - enables operation in under-hood environments without derating |
| Polarity | Unidirectional - blocks reverse current while clamping positive transients only |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint |
Pinout & Package
Package: SMC (DO-214AB), molded case meeting UL 94 V-0 flammability rating; matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during clamping | Connected to protected line (e.g., 12 V rail); conducts surge current to ground path |
| Cathode | Current exit during clamping | Connected to system ground; forms low-impedance path for transient energy dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure improves long-term reliability under thermal cycling |
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking preconditioning |
| Low clamping ratio (VC/VBR) | 1.42 typical - minimizes voltage overshoot on protected ICs during fast transients |
| High IPPM capability | 151 A peak pulse current - sustains multiple ISO 7637-2 Pulse 1/2/5a events without degradation |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between battery input and downstream DC/DC converter input. Use Value: Clamps transients to ≤19.9 V, preventing damage to 36 V-rated regulators and ensuring ASIL-B functional safety compliance. | Use Scenario: Safeguarding analog outputs of pressure sensors exposed to ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Unidirectional TVS shunting surge energy from 4–20 mA loop or 0–10 V output lines to ground. Use Value: Sub-20 ns response time and 19.9 V clamping limit ensure sensor signal integrity remains intact during 8 kV contact ESD events. |
| Telecom DC Power Input Protection | Consumer USB-C Power Delivery Line Protection |
Use Scenario: Securing primary 48 V DC input of PoE-powered network switches against lightning-induced surges. IC Role / Device Role / Timing Role: Front-end TVS on power entry board, upstream of hot-swap controller and filter capacitors. Use Value: 3000 W peak power rating meets IEC 61000-4-5 Combination Wave (10/700 μs) requirements for Class B equipment. | Use Scenario: Protecting VBUS line in USB-C receptacles against accidental 20 V PD negotiation faults and connector hot-plug transients. IC Role / Device Role / Timing Role: Unidirectional clamp between VBUS and chassis ground, sized for 3 A continuous load with surge margin. Use Value: 12 V VWM aligns with USB PD 3.0 default voltage; 19.9 V VC prevents latch-up in USB-C controller ICs during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/5AT | Lower PPPM (400 W), same VWM (12 V), SMC package, AEC-Q101 qualified | Not suitable for ISO 7637-2 Pulse 5a; limited to lower-energy transients | Select when cost sensitivity outweighs surge robustness and design operates below 1 kW surge exposure |
| 1.5KE12A | Higher VBR (13.3–14.7 V), same VC (20.1 V), axial DO-201 package, no AEC-Q101 | Requires through-hole assembly; not automotive-qualified; higher RθJA limits thermal performance | Choose for legacy industrial designs where board space allows axial components and AEC-Q101 is not mandated |
Compared with SMAJ12A-E3/5AT and 1.5KE12A, the 3KASMC12AHE3_B/H delivers 7.5× higher peak pulse power in the same SMC footprint while maintaining AEC-Q101 qualification - enabling single-device compliance with stringent automotive surge standards without layout redesign.
Availability
3KASMC12AHE3_B/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and USB-C PD systems requiring stable component supply with guaranteed AEC-Q101 qualification and RoHS/halogen-free compliance.
Supply support for 3KASMC12AHE3_B/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, MOSFETs, and TVS devices with emphasis on high-reliability, high-temperature, and automotive-qualified solutions.
The 3KASMC series was developed specifically for demanding automotive and industrial environments requiring >150 °C junction operation, AEC-Q101 validation, and 3000 W surge immunity - targeting power rail and interface protection in next-generation ADAS and electrification systems.
FAQ
What is the clamping voltage of the 3KASMC12AHE3_B/H under full-rated surge current?
The 3KASMC12AHE3_B/H has a maximum clamping voltage (VC) of 19.9 V when subjected to its peak pulse current (IPPM = 151 A) under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected circuits remain within safe operating limits during standardized surge events such as ISO 7637-2 Pulse 5a.
Is the 3KASMC12AHE3_B/H qualified for automotive applications?
Yes, the 3KASMC12AHE3_B/H is AEC-Q101 qualified, as confirmed by Vishay's documentation (Document Number: 88480, Revision: 19-Jan-2024). The HE3 suffix denotes RoHS-compliant and AEC-Q101 qualified construction, making the 3KASMC12AHE3_B/H suitable for use in engine control units, body electronics, and ADAS modules.
What does the "B/H" suffix mean in 3KASMC12AHE3_B/H?
The "B/H" suffix in 3KASMC12AHE3_B/H indicates packaging configuration: "B" is the revision code (per Vishay's marking convention), and "H" denotes 7-inch diameter plastic tape and reel packaging with a base quantity of 850 units. This format complies with EIA-481 standards and supports automated SMT placement.
Can the 3KASMC12AHE3_B/H replace older SMAJ12A devices in existing designs?
The 3KASMC12AHE3_B/H offers identical VWM (12 V) and comparable VBR but delivers 3000 W peak pulse power versus 400 W for SMAJ12A - meaning it can replace SMAJ12A in higher-energy surge environments. However, due to its higher IPPM and thermal mass, layout review for thermal relief and grounding is recommended before drop-in substitution.
What is the maximum operating temperature for the 3KASMC12AHE3_B/H?
The 3KASMC12AHE3_B/H is rated for a maximum junction temperature (TJ max.) of +185 °C, verified per AEC-Q101 stress testing. This enables reliable operation in under-hood automotive locations and high-ambient industrial enclosures without derating up to 150 °C ambient, provided PCB thermal design meets Vishay's recommended pad layout.
3KASMC12AHE3_B/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:
- 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)
3KASMC12AHE3_B/H FAQ
1.How can I place an order for 3KASMC12AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12AHE3_B/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 3KASMC12AHE3_B/H reliable?
The price and inventory of 3KASMC12AHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC12AHE3_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC12AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12AHE3_B/H?
3KASMC12AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12AHE3_B/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 3KASMC12AHE3_B/H?
For technical support, including 3KASMC12AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12AHE3_B/H requirements.
6.How does Aetrix verify that 3KASMC12AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC12AHE3_B/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 3KASMC12AHE3_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC12AHE3_B/H?
All 3KASMC12AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12AHE3_B/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 3KASMC12AHE3_B/H part is unused and in its original packaging.
Return procedure for 3KASMC12AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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