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Vishay General Semiconductor - Diodes Division 3KASMC28AHE3/9AT
- Part No.:
- 3KASMC28AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC28AHE3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,402
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Product details
Overview
3KASMC28AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000 W peak pulse power (10/1000 μs), 31.1–34.4 V breakdown voltage (VBR), and 185 °C maximum junction temperature - deployed for automotive-grade overvoltage protection of MOSFETs and sensor signal lines.
For engineers reviewing the 3KASMC28AHE3/9AT datasheet, 3KASMC28AHE3/9AT pinout, 3KASMC28AHE3/9AT application, or 3KASMC28AHE3/9AT equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, clamping performance at 66.1 A IPPM, thermal resistance (RθJA = 77.5 °C/W), and RoHS-compliant SMC packaging details critical for high-reliability board-level surge design.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under repetitive surge stress, with guaranteed operation up to TJ = 185 °C - enabling use in under-hood automotive modules where ambient temperatures exceed 125 °C. Its unidirectional polarity and low incremental surge resistance ensure fast response (<1 ns) and minimal voltage overshoot during transient events.
The device meets MSL Level 1 per J-STD-020 (peak reflow ≤ 260 °C), features matte tin-plated leads solderable per J-STD-002/JESD22-B102, and passes JESD201 Class 2 whisker testing - confirming robustness for automated assembly and long-term field reliability in industrial and automotive ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.1 V / 34.4 V at 1.0 mA - defines precise reverse breakdown threshold for reliable triggering before downstream IC damage |
| VWM | 28 V - maximum continuous reverse operating voltage; ensures no leakage conduction during normal 24 V system operation |
| VC @ IPPM | 45.4 V at 66.1 A - clamped voltage during 3000 W surge; limits protected circuit stress to safe margin below 48 V rail |
| PPPM | 3000 W (10/1000 μs) - supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-ground) without degradation |
| TJ max. | 185 °C - enables placement near heat sources (e.g., power MOSFETs) without derating in automotive engine control units |
| RθJA | 77.5 °C/W - quantifies thermal bottleneck in standard PCB layout; requires ≥ 100 mm² copper pour for full power handling |
| AEC-Q101 | Qualified - certified for automotive electronic systems per stress test requirements including HTGB, HTRB, and TCT |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode indicated by color band. Dimensions: 7.11 × 6.22 × 2.90 mm (L × W × H). RoHS-compliant, UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage return path; forms current sink during transient clamp event |
| Cathode | Protected line input | Connected to signal/power line being safeguarded; reverse-biased during normal operation, avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR over 1000+ surge cycles and 15-year automotive life |
| Clamping ratio (VC/VBR) | 1.30 - low ratio confirms efficient energy diversion with minimal voltage overshoot into protected circuitry |
| Surge current rating | 66.1 A (10/1000 μs) - exceeds ISO 7637-2 Pulse 5a requirements for 24 V commercial vehicle systems |
| Thermal reliability | Rated for TJ = 185 °C - eliminates need for thermal derating in high-ambient under-dash or powertrain applications |
| Assembly compatibility | MSL Level 1 + JESD201 Class 2 whisker resistance - supports lead-free reflow without solder joint degradation or field failure |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 24 V supply rails in body control modules against load dump transients (ISO 16750-2, 35 V/100 ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input to clamp surges before regulator stage. Use Value: Withstands 3000 W pulses and maintains VC = 45.4 V - keeping downstream LDOs and microcontrollers within absolute maximum ratings. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) in pressure/temperature sensors from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and ground to suppress sub-100 ns transients without distorting 1 kHz bandwidth signals. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) with <1 ns response and adds <0.5 pF parasitic capacitance - preserving signal integrity. |
| Motor Drive Gate Driver Protection | Telecom DC Feeder Surge Suppression |
Use Scenario: Safeguarding high-side N-channel MOSFET gate drivers in BLDC inverters from Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: TVS placed between gate and source to clamp dv/dt-induced overshoot exceeding VGS(max). Use Value: Fast response and low VF (3.5 V at 100 A) prevent latch-up in driver ICs while surviving repeated 200 A surge events. |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) on 48 V DC feeder lines from lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level TVS installed at DC input connector to absorb common-mode surges before isolation transformer. Use Value: 3000 W rating handles 4 kV/2 Ω combination wave; DO-214AB footprint allows compact placement with minimal trace inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A | Lower PPPM = 600 W; same VBR range but higher VC = 45.7 V; SMB package (smaller thermal mass) | Limited to lower-energy transients (e.g., IEC 61000-4-4); unsuitable for ISO 7637-2 load dump | Select only for space-constrained consumer designs with <1 kV surge exposure |
| 1.5KE28A | Higher PPPM = 1500 W; axial DO-201 package; slower thermal response; not AEC-Q101 qualified | Requires through-hole mounting; lacks automotive qualification and high-temp reliability for engine bay use | Acceptable for industrial mains-powered equipment where reflow compatibility and 185 °C operation are not required |
Compared with SMBJ28A and 1.5KE28A, the 3KASMC28AHE3/9AT delivers 5× higher surge power handling, AEC-Q101 certification, and 185 °C junction rating - making it the sole choice for automotive power electronics requiring validated long-term reliability under thermal and electrical stress.
Availability
3KASMC28AHE3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, motor drive protection, and telecom DC feeder systems requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 3KASMC28AHE3/9AT 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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMC series belongs to Vishay's PAR® TVS platform, engineered specifically for AEC-Q101-compliant, high-temperature-stable transient suppression in next-generation automotive ECUs and harsh-environment industrial controls.
FAQ
What is the exact breakdown voltage range for 3KASMC28AHE3/9AT?
The 3KASMC28AHE3/9AT has a guaranteed breakdown voltage (VBR) range of 31.1 V to 34.4 V at 1.0 mA test current, as specified in the Vishay datasheet (Doc #89962, Rev 05-Mar-13). This tight tolerance ensures consistent clamping behavior across production lots and supports precise overvoltage margining in 24 V automotive systems where the 3KASMC28AHE3/9AT is commonly deployed.
Is 3KASMC28AHE3/9AT qualified for automotive applications?
Yes, the 3KASMC28AHE3/9AT is AEC-Q101 qualified per the official Vishay documentation, confirming compliance with stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT). Its 185 °C maximum junction temperature rating and MSL Level 1 reflow compatibility make the 3KASMC28AHE3/9AT suitable for under-hood and transmission-control module applications.
What does the 'HE3/9AT' suffix mean in 3KASMC28AHE3/9AT?
The 'HE3/9AT' suffix indicates the packaging configuration: 'HE3' denotes the base part revision and RoHS-compliant construction (HM3 variant), while '/9AT' specifies tape-and-reel delivery in 13-inch diameter reels with a 3500-unit quantity per reel. This format aligns with Vishay's ordering nomenclature in Document #89962 and ensures compatibility with high-speed SMT placement equipment used in automotive electronics manufacturing.
How does the clamping voltage of 3KASMC28AHE3/9AT compare to its stand-off voltage?
The 3KASMC28AHE3/9AT has a stand-off voltage (VWM) of 28 V and a maximum clamping voltage (VC) of 45.4 V at 66.1 A peak pulse current. This 62% overvoltage margin provides robust protection for 36 V-rated components while maintaining sufficient headroom below typical 48 V system rails - a key design advantage of the 3KASMC28AHE3/9AT over lower-power TVS devices in demanding surge environments.
Can 3KASMC28AHE3/9AT be used in bidirectional configurations?
No, the 3KASMC28AHE3/9AT is unidirectional only, as explicitly stated in the Vishay datasheet. It conducts in reverse breakdown during positive transients on the cathode but blocks forward current like a standard diode. For bidirectional protection, two 3KASMC28AHE3/9AT devices must be connected in series opposition - though Vishay offers dedicated bidirectional variants (e.g., 3KASMC28CA) if symmetrical clamping is required.
3KASMC28AHE3/9AT 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 66.1A
- 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)
3KASMC28AHE3/9AT FAQ
1.How can I place an order for 3KASMC28AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC28AHE3/9AT 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 3KASMC28AHE3/9AT reliable?
The price and inventory of 3KASMC28AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC28AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC28AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC28AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC28AHE3/9AT?
3KASMC28AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC28AHE3/9AT 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 3KASMC28AHE3/9AT?
For technical support, including 3KASMC28AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC28AHE3/9AT requirements.
6.How does Aetrix verify that 3KASMC28AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC28AHE3/9AT 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 3KASMC28AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC28AHE3/9AT?
All 3KASMC28AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC28AHE3/9AT, 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 3KASMC28AHE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC28AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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