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Vishay General Semiconductor - Diodes Division 3KASMC30HE3/9AT
- Part No.:
- 3KASMC30HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC30HE3/9AT.pdf
- Description:
- TVS DIODE 30VWM 53.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,789
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Product details
Overview
3KASMC30HE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 30 V stand-off voltage, 33.3–36.8 V breakdown at 1 mA, 3000 W peak pulse power (10/1000 µs), 185 °C max junction temperature, and AEC-Q101 qualified for automotive power line protection.
For engineers reviewing the 3KASMC30HE3/9AT datasheet, 3KASMC30HE3/9AT pinout, 3KASMC30HE3/9AT application, or 3KASMC30HE3/9AT equivalent, this page delivers verified electrical specs, thermal performance, clamping behavior under surge, and direct-fit alternatives for high-reliability 12 V/24 V automotive and industrial DC bus protection.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping up to TJ = 185 °C, with low incremental surge resistance and fast response time enabling effective suppression of inductive switching transients and ESD events on power rails. It operates exclusively in unidirectional mode and meets MSL Level 1 per J-STD-020 at 260 °C peak reflow.
The device is characterized by a 48.4 V maximum clamping voltage at 62.0 A peak pulse current (10/1000 µs), 1.0 µA max reverse leakage at 30 V, and thermal resistance of 77.5 °C/W (junction-to-ambient) on standard PCB pad layout - all validated under AEC-Q101 stress conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above nominal 24 V automotive rail. |
| VBR (min/max) | 33.3 V / 36.8 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| PPPM | 3000 W (10/1000 µs) - Sustains high-energy transients common in load-dump and ISO 7637-2 Pulse 5a testing. |
| VC @ IPPM | 48.4 V at 62.0 A - Clamping voltage limits downstream IC/MOSFET stress during surge; critical for 40 V-rated components. |
| TJ max | +185 °C - Enables operation in under-hood environments and supports long-term reliability under thermal cycling. |
| AEC-Q101 | Qualified - Validated for automotive-grade robustness including HTGB, HTRB, TCT, and UHAST per AEC standard. |
| RθJA | 77.5 °C/W - Thermal performance measured on minimum recommended pad layout; informs heatsinking requirements. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional polarity indicated by cathode band. Matte tin-plated leads, RoHS-compliant, MSL Level 1, LF peak 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground or return path | Completes conduction path during reverse-biased transient clamping; must be routed with low-inductance trace. |
| Cathode | High-side connection to protected line (e.g., battery+, VIN) | Receives transient energy; marked by color band; connects to rail requiring overvoltage protection. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage and breakdown characteristics across -65 °C to +185 °C operating range. |
| 3000 W peak pulse power (10/1000 µs) | Withstands automotive load-dump surges (ISO 7637-2 Pulse 5a) without degradation. |
| Clamping voltage ≤48.4 V at 62 A | Protects 40 V-rated MOSFETs and controllers on 24 V systems within safe SOA limits. |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body electronics, and ADAS ECUs. |
| MSL Level 1, 260 °C peak reflow | Supports standard SMT assembly without moisture sensitivity concerns or baking requirement. |
Applications
| Automotive Power Line Protection | Industrial DC Power Rail Clamp |
|---|---|
Use Scenario: Suppresses load-dump transients (up to 60 V, 400 ms) on 24 V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse surge energy into ground, limiting rail voltage to ≤48.4 V during event. Use Value: Prevents latch-up or destruction of 40 V-rated CAN transceivers and microcontrollers without adding series impedance. |
Use Scenario: Protects PLC I/O modules against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Fast-response TVS shunts >1 kV spikes within nanoseconds, preserving signal integrity on 24 V control lines. Use Value: Eliminates need for external snubbers while maintaining immunity to IEC 61000-4-4 level 4 bursts. |
| Telecom DC Feeder Protection | Consumer Appliance Motor Drive Clamp |
Use Scenario: Shields PoE-powered remote units from lightning-induced surges on 48 V DC feeders. IC Role / Device Role / Timing Role: Acts as primary overvoltage clamp upstream of DC-DC converters and Ethernet PHYs. Use Value: Withstands 3000 W pulses without parametric shift, ensuring multi-year field reliability in outdoor cabinets. |
Use Scenario: Absorbs back-EMF from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Unidirectional TVS placed across motor terminals to clamp flyback voltage during PWM commutation. Use Value: Reduces radiated emissions and prevents MCU reset caused by >100 V transients on shared 24 V supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A | Same DO-214AC (SMA) package; lower PPPM (400 W); VC = 48.4 V at 8.3 A; RθJA = 110 °C/W | Not AEC-Q101 qualified; limited to consumer/industrial use; insufficient for automotive load-dump | Select only for cost-sensitive non-automotive designs where surge energy ≤400 W. |
| SMCJ30A | Same DO-214AB (SMC) package; identical PPPM (3000 W); VC = 48.4 V at 62 A; AEC-Q101 qualified | Functionally identical clamping and thermal performance; differs only in marking code and internal lot traceability | Direct functional replacement; verify manufacturer-specific qualification documentation before cross-use. |
Compared with SMAJ30A and SMCJ30A, the 3KASMC30HE3/9AT offers identical surge capability and automotive qualification but with Vishay's HM3 suffix indicating enhanced whisker resistance and JESD201 Class 2 compliance - critical for long-life automotive modules exposed to thermal cycling.
Availability
3KASMC30HE3/9AT is available at Aetrix Electronics and suitable for automotive power line protection, industrial DC rail clamping, telecom feeder surge suppression, and consumer appliance motor drive circuits requiring stable component supply and full AEC-Q101 traceability.
Supply support for 3KASMC30HE3/9AT 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 components.
The 3KASMCxxA family was engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive and industrial power systems, prioritizing thermal stability, surge endurance, and solder-reflow robustness.
FAQ
What is the clamping voltage of the 3KASMC30HE3/9AT at its rated peak pulse current?
The 3KASMC30HE3/9AT has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current of 62.0 A using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 05-Mar-13, ensuring predictable overvoltage limiting for downstream 40 V-rated components in the 3KASMC30HE3/9AT protection circuit.
Is the 3KASMC30HE3/9AT suitable for automotive applications?
Yes, the 3KASMC30HE3/9AT is AEC-Q101 qualified and rated for TJ = -65 °C to +185 °C, making it suitable for under-hood and powertrain applications. Its 3000 W peak pulse power rating and 48.4 V clamping voltage meet ISO 7637-2 Pulse 5a load-dump requirements. The 3KASMC30HE3/9AT also passes MSL Level 1 reflow and JESD201 Class 2 whisker testing - all documented in Vishay's official qualification report for the 3KASMC30HE3/9AT.
What does the 'HM3/9AT' suffix mean in 3KASMC30HE3/9AT?
The 'HM3' suffix denotes Vishay's RoHS-compliant, AEC-Q101-qualified base P/N designation with matte tin plating and JESD201 Class 2 whisker resistance. The '/9AT' indicates packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3500 units. This full part number - 3KASMC30HE3/9AT - uniquely identifies the qualified variant with verified thermal, surge, and assembly performance.
How does the 3KASMC30HE3/9AT compare to standard SMAJ30A in surge handling?
The 3KASMC30HE3/9AT delivers 3000 W peak pulse power (10/1000 µs), whereas SMAJ30A is rated for only 400 W. The 3KASMC30HE3/9AT also features lower thermal resistance (77.5 °C/W vs. 110 °C/W), higher surge current rating (62 A vs. 8.3 A), and AEC-Q101 qualification - making the 3KASMC30HE3/9AT appropriate for automotive load-dump protection where SMAJ30A would fail catastrophically.
What is the reverse leakage current specification for the 3KASMC30HE3/9AT at 30 V?
The 3KASMC30HE3/9AT specifies a maximum reverse leakage current (IR) of 1.0 µA at VWM = 30 V and TA = 25 °C. At elevated temperature (TJ = 150 °C), leakage remains ≤15 µA - a value confirmed in the Electrical Characteristics table of the Vishay datasheet (Doc #89962). This low leakage ensures minimal standby power loss in always-on 3KASMC30HE3/9AT protection circuits.
3KASMC30HE3/9AT 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 56.1A
- 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)
3KASMC30HE3/9AT FAQ
1.How can I place an order for 3KASMC30HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC30HE3/9AT 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 3KASMC30HE3/9AT reliable?
The price and inventory of 3KASMC30HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC30HE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC30HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC30HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC30HE3/9AT?
3KASMC30HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC30HE3/9AT 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 3KASMC30HE3/9AT?
For technical support, including 3KASMC30HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC30HE3/9AT requirements.
6.How does Aetrix verify that 3KASMC30HE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC30HE3/9AT 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 3KASMC30HE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC30HE3/9AT?
All 3KASMC30HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC30HE3/9AT, 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 3KASMC30HE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC30HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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