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Vishay General Semiconductor - Diodes Division 3KASMC20AHE3/9AT
- Part No.:
- 3KASMC20AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC20AHE3/9AT.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,646
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Product details
Overview
3KASMC20AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000 W peak pulse power (10/1000 µs), 20 V stand-off voltage (VWM), and 32.4 V clamping voltage (VC) at 92.6 A peak surge current. It operates up to 185 °C junction temperature and is AEC-Q101 qualified for automotive power line protection.
For engineers reviewing the 3KASMC20AHE3/9AT datasheet, 3KASMC20AHE3/9AT pinout, 3KASMC20AHE3/9AT application, or 3KASMC20AHE3/9AT equivalent, this device serves as a high-reliability, high-temperature TVS for inductive load switching transients on 12 V–24 V automotive power rails, sensor signal lines, and MOSFET gate drivers where low clamping voltage and fast response are critical.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for stable performance under thermal stress. Its unidirectional polarity enables integration into DC-biased circuits without reverse conduction risk during normal operation.
It delivers 3000 W peak pulse power handling per 10/1000 µs waveform while maintaining 32.4 V clamping at 92.6 A, and exhibits low incremental surge resistance for minimal voltage overshoot during transient events. Thermal resistance is 77.5 °C/W (junction-to-ambient) and 18.3 °C/W (junction-to-leads), supporting robust thermal management on standard PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for 12 V–24 V systems. |
| VBR (min/max) | 22.2 V / 24.5 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold across production lot. |
| VC @ IPPM | 32.4 V - Clamped voltage at 92.6 A peak surge current; limits downstream IC voltage stress during ESD or load dump events. |
| PPPM | 3000 W - Peak pulse power rating per 10/1000 µs waveform; supports high-energy transients common in automotive ISO 7637-2 and IEC 61000-4-5 testing. |
| TJ max. | +185 °C - Maximum junction temperature rating; enables use in under-hood environments without derating in most mounting conditions. |
| AEC-Q101 | Qualified - Certified for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock per AEC-Q101 Rev D. |
| RθJA | 77.5 °C/W - Junction-to-ambient thermal resistance on standard pad layout; informs board-level thermal design for sustained power dissipation. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by color band. Meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to lower-potential side of protected circuit (e.g., ground or return path); conducts during forward surge events. |
| Cathode | Reverse-biased clamping terminal | Connected to higher-potential rail (e.g., battery +12 V); initiates avalanche breakdown when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and leakage over lifetime and temperature cycling. |
| 185 °C TJ capability | Enables direct placement near heat sources (e.g., power converters, engine control units) without external heatsinking. |
| 3000 W peak pulse power | Withstands high-energy transients such as ISO 7637-2 Pulse 5a (load dump) without degradation or failure. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage stress on downstream components-critical for protecting 3.3 V or 5 V logic interfaces powered from protected rails. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppressing load dump transients on 12 V/24 V battery-fed ECUs, body control modules, and lighting drivers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges above 20 V. Use Value: Limits peak voltage to ≤32.4 V during 92.6 A transients, preventing damage to MCU power supplies and CAN transceivers. |
Use Scenario: Protecting analog outputs and digital I/O of pressure, temperature, and position sensors in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and ground to absorb ESD and switching noise. Use Value: Maintains signal integrity with <1 μA leakage at 20 V, enabling accurate sub-mV sensor readings in noisy industrial environments. |
| DC Motor Drive Gate Protection | Telecom Power Interface Protection |
Use Scenario: Safeguarding N-channel MOSFET gate drivers against inductive kickback from brushed DC motors. IC Role / Device Role / Timing Role: TVS placed between gate and source to clamp negative-going spikes during turn-off. Use Value: Fast response time and 32.4 V clamping prevent gate oxide breakdown in logic-level MOSFETs operating at ≤20 V gate drive. |
Use Scenario: Hardening 48 V PoE-powered equipment front-ends against lightning-induced surges on Ethernet power pairs. IC Role / Device Role / Timing Role: Primary TVS on DC input rail upstream of DC/DC converter. Use Value: 3000 W rating meets IEC 61000-4-5 Level 4 (4 kV/2 kA) requirements when used with appropriate series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Lower peak pulse power (400 W), same DO-214AC (SMA) package, VWM = 20 V, VC = 32.4 V at 12.3 A. | Not suitable for automotive load dump; limited to low-energy ESD and microsecond transients. | Select SMAJ20A only for cost-sensitive consumer electronics where 3000 W surge immunity is unnecessary. |
| SMCJ20A | Same DO-214AB (SMC) package, identical VWM/VC ratings, but rated for 1500 W (10/1000 µs), not 3000 W. | Meets ISO 7637-2 Pulse 1/2b but not Pulse 5a; insufficient for full automotive load dump compliance. | Choose SMCJ20A if system-level testing confirms 1500 W is sufficient and footprint compatibility is required. |
Compared with SMAJ20A and SMCJ20A, the 3KASMC20AHE3/9AT provides double the surge power rating of SMCJ20A and nearly eight times that of SMAJ20A-enabling single-device compliance with stringent automotive load dump standards without parallel devices or additional thermal derating.
Availability
3KASMC20AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drives, and telecom power interface designs requiring stable component supply, AEC-Q101 qualification, and high-temperature reliability.
Supply support for 3KASMC20AHE3/9AT 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, high-temperature, and automotive-qualified solutions.
The 3KASMCxxA family was designed specifically for demanding automotive and industrial transient suppression applications where extended temperature operation, AEC-Q101 compliance, and 3000 W surge capability are mandatory.
FAQ
What is the maximum clamping voltage of the 3KASMC20AHE3/9AT under surge conditions?
The 3KASMC20AHE3/9AT has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 92.6 A using a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components remain within safe voltage limits during standardized surge events such as ISO 7637-2 Pulse 5a.
Is the 3KASMC20AHE3/9AT suitable for bidirectional transient protection?
No, the 3KASMC20AHE3/9AT is unidirectional only, as confirmed in the Vishay datasheet. It protects against positive transients on DC-biased lines and must be oriented with cathode toward the higher-potential rail. For bidirectional protection, a separate symmetric TVS array or dual-diode configuration is required-not provided by the 3KASMC20AHE3/9AT itself.
Does the 3KASMC20AHE3/9AT meet RoHS and halogen-free requirements?
Yes, the 3KASMC20AHE3/9AT carries the HM3 suffix, indicating it is RoHS-compliant per Directive 2011/65/EU and halogen-free per JEDEC JS709A. The molding compound meets UL 94 V-0, and terminals are matte tin plated per J-STD-002 and JESD 22-B102.
What is the thermal resistance and how does it affect PCB layout for the 3KASMC20AHE3/9AT?
The 3KASMC20AHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W on the recommended pad layout. To maintain reliable operation at elevated ambient temperatures, designers must follow Vishay's minimum pad dimensions (0.126" × 0.185") and avoid excessive copper isolation. Larger copper areas reduce RθJA and improve surge endurance.
Can the 3KASMC20AHE3/9AT replace the older 3KASMC20A without design changes?
Yes-the 3KASMC20AHE3/9AT is a tape-and-reel packaging variant of the base 3KASMC20A device, sharing identical electrical specifications, DO-214AB package dimensions, pinout, and AEC-Q101 qualification. The "HE3/9AT" suffix denotes 13" reel packaging (3500 pcs), with no functional or mechanical differences affecting PCB layout or circuit performance.
3KASMC20AHE3/9AT 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 92.6A
- 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)
3KASMC20AHE3/9AT FAQ
1.How can I place an order for 3KASMC20AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC20AHE3/9AT 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 3KASMC20AHE3/9AT reliable?
The price and inventory of 3KASMC20AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC20AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC20AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC20AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC20AHE3/9AT?
3KASMC20AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC20AHE3/9AT 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 3KASMC20AHE3/9AT?
For technical support, including 3KASMC20AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC20AHE3/9AT requirements.
6.How does Aetrix verify that 3KASMC20AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC20AHE3/9AT 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 3KASMC20AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC20AHE3/9AT?
All 3KASMC20AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC20AHE3/9AT, 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 3KASMC20AHE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC20AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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