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Vishay General Semiconductor - Diodes Division 3KASMC24AHM3_A/I
- Part No.:
- 3KASMC24AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC24AHM3_A/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,402
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Product details
Overview
3KASMC24AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 38.9 V @ 77.1 A, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and ICs against inductive switching transients in engine control units and power converters.
For engineers reviewing the 3KASMC24AHM3_A/I datasheet, 3KASMC24AHM3_A/I pinout, 3KASMC24AHM3_A/I application, or 3KASMC24AHM3_A/I equivalent, this page provides verified electrical specs, DO-214AB package details, AEC-Q101 qualification status, thermal resistance data, and real-world use cases in automotive sensor power conditioning and DC bus overvoltage suppression.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional architecture supports forward-biased clamping on positive-going transients while maintaining 24 V stand-off voltage and 1.0 μA leakage at rated VWM.
It meets J-STD-020 MSL Level 1 (260 °C peak reflow), passes JESD201 Class 2 whisker testing, and is qualified to AEC-Q101 - confirming suitability for under-hood automotive electronics where thermal cycling and long-term reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 26.7 V / 29.5 V at 1 mA - Verified breakdown threshold ensures predictable turn-on during surges without premature conduction. |
| PPPM | 3000 W (10/1000 μs) - Sustains high-energy transients common in automotive load-dump and inductive kick events. |
| VC @ IPPM | 38.9 V @ 77.1 A - Clamping voltage limits downstream component stress during worst-case surge conditions. |
| TJ max | 185 °C - Enables operation in high-ambient environments such as engine compartments without derating. |
| RθJA | 77.5 °C/W - Thermal resistance informs PCB pad layout requirements for reliable power dissipation at 6.0 W steady-state. |
| AEC-Q101 | Qualified - Confirmed reliability for automotive applications per stress test standard including HTGB, HTRB, and TCT. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by band. Meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to protected circuit ground or low-side return path; enables clamping of positive transients to GND. |
| Cathode | Current exit point during forward conduction | Connected to protected line (e.g., 24 V rail); absorbs surge energy when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design improves long-term stability under thermal cycling and humidity exposure. |
| MSL Level 1 | Rated for 260 °C peak reflow profile - eliminates pre-baking requirement and supports standard SMT assembly. |
| Low Rsurge | Minimizes voltage overshoot during fast-rising transients (<1 ns response), enhancing protection fidelity. |
| RoHS & Halogen-Free | Complies with JEDEC JS709A and EU Directive 2011/65/EU - suitable for global automotive supply chains. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial 24 V DC Power Supply |
|---|---|
Use Scenario: Protects microcontroller I/O and gate drivers from load-dump spikes (ISO 7637-2 Pulse 5a) and alternator ripple in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V rail and chassis ground to clamp transients above 29.5 V. Use Value: Limits clamped voltage to 38.9 V, ensuring downstream 40 V-rated MOSFETs and LDOs remain within safe operating area. |
Use Scenario: Shields programmable logic controllers (PLCs) and motor drives from inductive kickback during solenoid/relay switching. IC Role / Device Role / Timing Role: Standoff device absorbing repetitive 3000 W surges on 24 V DC bus lines without degradation. Use Value: Maintains 1.0 μA leakage at 24 V, minimizing standby current loss while delivering 77.1 A surge current capability. |
| Automotive Sensor Signal Conditioning | Telecom DC Feeder Protection |
Use Scenario: Safeguards analog front-end circuits of pressure and temperature sensors exposed to battery transients in ADAS modules. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF at 0 V) placed at connector interface to suppress ESD and fast transients. Use Value: 185 °C max junction temperature allows placement near heat-generating components without thermal derating. |
Use Scenario: Protects PoE-powered remote radio units (RRUs) from lightning-induced surges on 24–48 V DC feeder lines. IC Role / Device Role / Timing Role: Primary clamping device in series with DC input, coordinated with upstream fuses and secondary TVS arrays. Use Value: 3000 W rating handles multi-kA induced surges per IEC 61000-4-5 Level 4, validated across -65 °C to +185 °C range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W), smaller SMA package (DO-214AC), 30.0 V VC @ 13.3 A | Not AEC-Q101 qualified; limited to commercial-grade 150 °C TJ max | Select for cost-sensitive non-automotive applications where surge energy is ≤400 W and board space is constrained. |
| SMCJ24A | Same DO-214AB package, 3000 W rating, but VC = 38.9 V @ 77.1 A - identical clamping performance; differs only in marking code and packaging suffix | Functionally identical clamping behavior and thermal specs; not branded as PAR® or explicitly AEC-Q101 in all variants | Verify AEC-Q101 certificate and PAR® branding if required for automotive PPAP; otherwise functionally interchangeable. |
Compared with SMAJ24A and SMCJ24A, the 3KASMC24AHM3_A/I offers guaranteed AEC-Q101 qualification, PAR®-optimized passivation for extended life at 185 °C, and traceable RoHS/Halogen-Free compliance - making it the preferred choice for Tier 1 automotive power rail protection where reliability validation is mandatory.
Availability
3KASMC24AHM3_A/I is available at Aetrix Electronics and suitable for automotive engine control units, industrial 24 V DC power supplies, and telecom DC feeder protection requiring stable component supply, full AEC-Q101 documentation, and long-term lifecycle support.
Supply support for 3KASMC24AHM3_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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMC24AHM3_A/I belongs to Vishay's PAR® (Passivated Anisotropic Rectifier) TVS family, engineered specifically for demanding automotive and industrial surge protection where thermal stability, low leakage, and repeatable clamping performance are essential.
FAQ
What is the clamping voltage of the 3KASMC24AHM3_A/I under maximum surge conditions?
The 3KASMC24AHM3_A/I clamps at 38.9 V when subjected to its rated peak pulse current of 77.1 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 24 V system components. The 3KASMC24AHM3_A/I maintains this clamping performance across its full operating temperature range.
Is the 3KASMC24AHM3_A/I qualified for automotive applications?
Yes, the 3KASMC24AHM3_A/I is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (Document Number: 89962). It has passed stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT), validating its suitability for under-hood automotive electronics. The 3KASMC24AHM3_A/I also meets J-STD-020 MSL Level 1 for lead-free reflow compatibility.
What does the "HM3_A/I" suffix indicate in 3KASMC24AHM3_A/I?
The "HM3" denotes the RoHS-compliant, AEC-Q101-qualified DO-214AB (SMC) package variant; "_A" indicates the revision level; and "/I" specifies bulk packaging in 13-inch tape-and-reel format with 3500 units per reel. This ordering code aligns with Vishay's documented delivery mode structure and confirms full compliance with material categorization per doc?99912. The 3KASMC24AHM3_A/I is traceable to this exact configuration.
How does the thermal resistance of the 3KASMC24AHM3_A/I affect PCB layout?
The 3KASMC24AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W, which requires adherence to Vishay's recommended minimum pad layout (0.126" × 0.185") for effective heat dissipation. Exceeding 6.0 W steady-state power without adequate copper area will cause junction temperature to exceed 185 °C. The 3KASMC24AHM3_A/I thermal performance is validated using that specific footprint.
Can the 3KASMC24AHM3_A/I replace older SMCJ24A parts in existing designs?
The 3KASMC24AHM3_A/I shares identical electrical specs (VWM, VBR, VC, PPPM), DO-214AB package dimensions, and pinout with SMCJ24A, but adds PAR® passivation and explicit AEC-Q101 certification. If the original design requires automotive qualification or enhanced long-term reliability at 185 °C, the 3KASMC24AHM3_A/I is a validated upgrade; however, full revalidation is recommended per customer quality protocols before deployment.
3KASMC24AHM3_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)
3KASMC24AHM3_A/I FAQ
1.How can I place an order for 3KASMC24AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC24AHM3_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 3KASMC24AHM3_A/I reliable?
The price and inventory of 3KASMC24AHM3_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 3KASMC24AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC24AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC24AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC24AHM3_A/I?
3KASMC24AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC24AHM3_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 3KASMC24AHM3_A/I?
For technical support, including 3KASMC24AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC24AHM3_A/I requirements.
6.How does Aetrix verify that 3KASMC24AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC24AHM3_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 3KASMC24AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC24AHM3_A/I?
All 3KASMC24AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC24AHM3_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 3KASMC24AHM3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC24AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC24AHM3_A/I Tags
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