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Vishay General Semiconductor - Diodes Division 3KASMC24AHE3_A/I
- Part No.:
- 3KASMC24AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC24AHE3_A/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,657
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Product details
Overview
3KASMC24AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 24 V stand-off voltage, 3000 W peak pulse power (10/1000 µs), 77.1 A peak surge current, 38.9 V clamping voltage, and 185 °C maximum junction temperature - deployed for automotive-grade overvoltage protection of power rails and signal lines.
For engineers reviewing the 3KASMC24AHE3_A/I datasheet, 3KASMC24AHE3_A/I pinout, 3KASMC24AHE3_A/I application, or 3KASMC24AHE3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, MSL Level 1 reflow compatibility, low incremental surge resistance, and thermal stability up to TJ = 185 °C in high-reliability automotive and industrial environments.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for junction stability under repetitive surge stress. Its unidirectional architecture provides forward conduction only during reverse transient clamping, with VF = 3.5 V at 100 A ensuring minimal forward drop during surge events.
Thermal design is supported by RθJL = 18.3 °C/W (junction-to-leads) and RθJA = 77.5 °C/W (junction-to-ambient on recommended pad layout), enabling robust operation under sustained 6.0 W power dissipation at TL = 75 °C with derating above TA = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail protection threshold. |
| VBR (min/max) | 26.7 V / 29.5 V at IT = 1 mA - Breakdown voltage range ensures consistent turn-on behavior across production lots. |
| VC @ IPPM | 38.9 V at 77.1 A - Clamping voltage under 10/1000 µs surge; limits downstream IC voltage stress during transients. |
| PPPM | 3000 W - Peak pulse power handling capability per standard 10/1000 µs waveform; validates robustness against ISO 7637-2 Pulse 1/2/5a. |
| TJ max. | +185 °C - Enables use in under-hood automotive modules and high-temperature industrial control enclosures without derating. |
| AEC-Q101 | Qualified - Confirmed reliability for automotive electronics per stress test requirements including HTGB, HTRB, and TCT. |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 7.11 mm x 6.60 mm body and matte tin-plated leads compliant with J-STD-002. |
Pinout & Package
DO-214AB (SMC) package: cathode-indicating band on one end; two-terminal device with anode and cathode leads formed in gull-wing configuration for PCB soldering. Mounting requires minimum pad dimensions per Vishay specification: 3.20 mm × 1.52 mm per pad, 4.69 mm center-to-center spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or transient clamping | Connected to protected circuit ground or low-side return path; forms clamping loop with cathode. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., 24 V supply or CAN_H); color band identifies this terminal for correct orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process reduces leakage drift and improves long-term stability at TJ = 150–185 °C. |
| MSL Level 1 rating | Rated for peak reflow temperature of 260 °C per J-STD-020 - supports single-pass lead-free assembly without moisture sensitivity concerns. |
| Low incremental surge resistance | Enables tighter VC vs. IPPM relationship - critical for protecting fast-switching MOSFET gates and microcontroller I/O pins. |
| Uni-directional polarity only | Simplifies layout and eliminates ambiguity in placement; avoids unintended conduction during normal forward-biased operation. |
| RoHS-compliant & halogen-free | Meets JEDEC JS709A and EU Directive 2011/65/EU - suitable for global automotive Tier-1 supply chain compliance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 24 V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Primary clamping element placed between battery input and DC-DC converter input stage. Use Value: Limits voltage excursion to ≤38.9 V during 3000 W surges, preventing damage to upstream regulators and MCU power domains. |
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loop) from ESD and inductive switching noise in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional transient shunt placed across sensor output terminals, leveraging unidirectional clamping referenced to system ground. Use Value: Maintains signal integrity with <1 µA IR at 24 V while clamping fast transients within 1 ns response time. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: Safeguarding -48 V telecom rectifier outputs against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Reverse-polarity-connected TVS on the negative rail, clamping positive-going transients to chassis ground. Use Value: Withstands 200 A IFSM (8.3 ms half-sine), enabling survival of repeated surge events without degradation. |
Use Scenario: Shielding high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during bridge switching. IC Role / Device Role / Timing Role: Local clamping device mounted directly at gate driver output, referenced to source node. Use Value: Low Rsurge minimizes overshoot during 100 ns rise-time transients, preserving gate oxide reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W), higher VC (38.9 V same), same VWM (24 V), DO-214AC (SMA) package - smaller footprint but lower thermal mass. | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); not qualified to AEC-Q101. | Select when space-constrained and surge energy is below 100 mJ; avoid for automotive or industrial load-dump scenarios. |
| SMCJ24A | Same DO-214AB package, identical VWM/VC/PPPM specs, but rated for 175 °C TJ max. and not AEC-Q101 qualified. | Acceptable for industrial use where extended temperature margin is not required; lacks automotive qualification documentation. | Choose for cost-sensitive non-automotive designs requiring identical electrical performance and mechanical fit. |
Compared with SMAJ24A and SMCJ24A, the 3KASMC24AHE3_A/I delivers verified AEC-Q101 qualification and guaranteed 185 °C operation - making it the only option among the three approved for under-hood automotive modules requiring zero failure-in-time (FIT) targets.
Availability
3KASMC24AHE3_A/I is available at Aetrix Electronics and suitable for automotive power distribution units, industrial PLC I/O modules, telecom DC power supplies, and motor drive gate driver circuits requiring stable component supply and full traceability.
Supply support for 3KASMC24AHE3_A/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, TVS devices, and optoelectronics with emphasis on reliability, thermal performance, and automotive qualification.
The 3KASMC series was engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive and industrial systems - prioritizing high-temperature stability, surge endurance, and reflow robustness over generic TVS functionality.
FAQ
What is the clamping voltage of the 3KASMC24AHE3_A/I under a 10/1000 µs surge?
The 3KASMC24AHE3_A/I has a maximum clamping voltage (VC) of 38.9 V at 77.1 A peak pulse current under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 05-Mar-13, Document Number 89962. The clamping performance remains stable across its full operating temperature range up to TJ = 185 °C.
Is the 3KASMC24AHE3_A/I AEC-Q101 qualified?
Yes, the 3KASMC24AHE3_A/I is explicitly AEC-Q101 qualified, as stated in the "Mechanical Data" section and "Notes" of the Vishay datasheet (Document Number 89962). This qualification covers stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT), confirming suitability for automotive electronic control units.
What does the '_A/I' suffix mean in 3KASMC24AHE3_A/I?
The '_A/I' suffix in 3KASMC24AHE3_A/I indicates the packaging configuration: 'A' denotes the base P/NHM3 variant (RoHS-compliant and AEC-Q101 qualified), and 'I' specifies the delivery mode as 13-inch diameter plastic tape and reel with 3500 units per reel. This matches Vishay's ordering information table in Document Number 89962.
Can the 3KASMC24AHE3_A/I be used in bidirectional protection circuits?
No, the 3KASMC24AHE3_A/I is unidirectional only, as clearly specified in the "Features" section of the datasheet. It conducts in reverse breakdown to clamp positive transients on the cathode side but does not protect against negative-going surges on the anode. For bidirectional protection, a separate device or a dedicated bidirectional TVS such as SMBJ24CA must be used.
What is the thermal resistance from junction to ambient for the 3KASMC24AHE3_A/I?
The typical thermal resistance from junction to ambient (RθJA) for the 3KASMC24AHE3_A/I is 77.5 °C/W, measured on the minimum recommended pad layout per Vishay's datasheet. This value assumes no heatsink and natural convection; actual performance improves significantly with copper pour and thermal vias, especially given its RθJL of 18.3 °C/W to the leads.
3KASMC24AHE3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 77.1A
- 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)
3KASMC24AHE3_A/I FAQ
1.How can I place an order for 3KASMC24AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC24AHE3_A/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 3KASMC24AHE3_A/I reliable?
The price and inventory of 3KASMC24AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC24AHE3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC24AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC24AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC24AHE3_A/I?
3KASMC24AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC24AHE3_A/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 3KASMC24AHE3_A/I?
For technical support, including 3KASMC24AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC24AHE3_A/I requirements.
6.How does Aetrix verify that 3KASMC24AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC24AHE3_A/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 3KASMC24AHE3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC24AHE3_A/I?
All 3KASMC24AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC24AHE3_A/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 3KASMC24AHE3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC24AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC24AHE3_A/I Tags
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