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Vishay General Semiconductor - Diodes Division 3KASMC28AHM3_B/I
- Part No.:
- 3KASMC28AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC28AHM3_B/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,393
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Product details
Overview
3KASMC28AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 28 V stand-off voltage (VWM), and 45.4 V maximum clamping voltage (VC) at 66.1 A IPPM. It operates up to TJ = 185 °C and is halogen-free, RoHS-compliant, and AEC-Q101 qualified - designed for automotive power line and sensor interface protection.
For engineers reviewing the 3KASMC28AHM3_B/I datasheet, 3KASMC28AHM3_B/I pinout, 3KASMC28AHM3_B/I application, or 3KASMC28AHM3_B/I equivalent, key selection criteria include clamping performance under 10/1000 μs surge, unidirectional polarity compatibility with DC bus architectures, thermal derating above 25 °C, and AEC-Q101 qualification status for automotive-grade deployment.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for junction stability at high temperatures. Its unidirectional structure provides low forward voltage (VF = 3.5 V at 100 A) and fast response time to transient events, enabling robust protection of downstream MOSFETs and ICs against inductive switching spikes.
Rated for 185 °C maximum junction temperature and MSL Level 1 (260 °C reflow), it supports high-reliability automotive applications where thermal cycling and long-term stability are critical. The SMC package delivers low thermal resistance (RθJL = 18.3 °C/W) and meets UL 94 V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bus or signal line standoff level. |
| VBR (min) | 31.1 V - Minimum breakdown voltage at 1 mA test current; ensures reliable turn-on margin above VWM. |
| VC @ IPPM | 45.4 V - Clamping voltage at 66.1 A peak pulse current; determines maximum stress imposed on protected circuitry. |
| PPPM | 3000 W - Peak pulse power handling capability with 10/1000 μs waveform; validates protection against ISO 7637-2 Pulse 1/2a/5a transients. |
| TJ max. | 185 °C - Maximum junction temperature rating; enables operation in under-hood automotive environments without derating penalties. |
| Polarity | Unidirectional - Supports DC-biased protection paths only; requires correct cathode orientation relative to protected node polarity. |
| RθJL | 18.3 °C/W - Junction-to-leads thermal resistance; informs PCB copper area and trace width design for thermal management. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, cathode indicated by color band. Meets UL 94 V-0, J-STD-002 solderability, and JESD 22-B102 whisker testing (Class 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during clamping | Connected to protected line (e.g., battery rail); conducts surge current toward cathode when reverse voltage exceeds VBR. |
| Cathode | Current exit point during clamping | Connected to ground or lower-potential reference; defines polarity direction and must align with system DC bias. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR over lifetime and temperature, critical for AEC-Q101 compliance. |
| 185 °C TJ rating | Enables direct placement near high-temperature sources (e.g., engine control units) without external heatsinking or derating. |
| 3000 W PPPM (10/1000 μs) | Validates immunity to severe automotive load dump and inductive kick events per ISO 16750-2 and ISO 7637-2. |
| Halogen-free & RoHS | Meets automotive environmental mandates (e.g., ELV Directive) and supports lead-free reflow assembly at 260 °C peak. |
| MSL Level 1 | Allows unlimited floor life and single-reflow processing without dry-pack or baking, reducing manufacturing overhead. |
Applications
| Automotive Power Distribution | Engine Control Unit (ECU) Inputs |
|---|---|
Use Scenario: Protection of 12 V battery-fed power rails against load dump transients (ISO 16750-2 Test 4a, 120 V/100 ms). IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converters and LDOs. Use Value: Limits rail voltage to ≤45.4 V during 3000 W surges, preventing overvoltage damage to sensitive regulators and microcontrollers. |
Use Scenario: Shielding analog and digital inputs of ECUs from inductive switching noise generated by solenoids and fuel injectors. IC Role / Device Role / Timing Role: Fast-response shunt protector on sensor signal lines (e.g., crankshaft position, throttle position). Use Value: Sub-nanosecond response time suppresses transients before they propagate into ADC front-ends or GPIO pins. |
| Body Control Module (BCM) Power Inputs | ADAS Camera Power Supply |
Use Scenario: Safeguarding BCM 12 V input against jump-start surges and alternator ripple-induced spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS on main power entry point, coordinated with upstream fuses. Use Value: Maintains 28 V VWM margin while clamping to 45.4 V, preserving fuse coordination and avoiding nuisance trips. |
Use Scenario: Protecting 5 V or 3.3 V camera module power rails from ESD and cable discharge events in rear-view systems. IC Role / Device Role / Timing Role: Secondary-stage TVS after primary DC-DC filtering, targeting low-capacitance clamping. Use Value: Low incremental surge resistance minimizes voltage overshoot during fast ESD pulses (IEC 61000-4-2 Contact ±8 kV). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28AHE3_A/H | Same VWM (28 V), but lower PPPM (400 W), smaller SMA package, no AEC-Q101 qualification. | Limited to consumer/industrial non-automotive use; insufficient for ISO 7637-2 Pulse 5a load dump. | Select only for cost-sensitive, non-automotive designs with lower surge exposure. |
| SMCJ28AHE3_A/H | Same VWM (28 V), same SMC package, 3000 W PPPM, but AEC-Q101 qualified only in HE3 suffix variants - HM3 variant not offered. | Compatible in footprint and electrical specs, but lacks halogen-free certification required by some OEMs. | Choose when halogen-free requirement is waived and standard RoHS compliance suffices. |
Compared with 3KASMC28AHM3_B/I, SMAJ28AHE3_A/H offers reduced surge capacity and no automotive qualification, while SMCJ28AHE3_A/H matches key ratings but omits halogen-free material compliance - making 3KASMC28AHM3_B/I the sole option meeting full AEC-Q101 + halogen-free + 3000 W requirements in SMC.
Availability
3KASMC28AHM3_B/I is available at Aetrix Electronics and suitable for automotive power distribution, engine control unit (ECU) protection, body control module (BCM) inputs, and ADAS camera supply lines requiring stable component supply across extended temperature and reliability lifecycles.
Supply support for 3KASMC28AHM3_B/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 high-reliability and automotive-grade performance.
The 3KASMCxxA family was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, delivering high-temperature stability and repeatable clamping behavior under repetitive surge stress.
FAQ
What is the clamping voltage of the 3KASMC28AHM3_B/I at its rated peak pulse current?
The 3KASMC28AHM3_B/I has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 66.1 A, measured using a 10/1000 μs waveform. This value is specified in the Electrical Characteristics table of Vishay Document Number 88480 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The 3KASMC28AHM3_B/I maintains this clamping performance across its full operating temperature range.
Is the 3KASMC28AHM3_B/I qualified for automotive applications?
Yes, the 3KASMC28AHM3_B/I is AEC-Q101 qualified, as confirmed in the Mechanical Data section of Vishay Document Number 88480. The HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - validating suitability for under-hood and safety-critical automotive systems.
What does the "HM3" suffix indicate in 3KASMC28AHM3_B/I?
The "HM3" suffix in 3KASMC28AHM3_B/I identifies the product as halogen-free, RoHS-compliant, and AEC-Q101 qualified - distinct from the HE3 suffix, which is RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both meet JESD 201 Class 2 whisker testing and MSL Level 1, but HM3 satisfies additional OEM environmental requirements such as the German Automotive Industry Association (VDA) halogen ban.
What is the thermal resistance from junction to leads for the 3KASMC28AHM3_B/I?
The 3KASMC28AHM3_B/I has a typical thermal resistance from junction to leads (RθJL) of 18.3 °C/W, as published in the Thermal Characteristics table of Vishay Document Number 88480. This parameter directly impacts PCB layout decisions - for example, minimum recommended pad layout and copper pour area - to ensure junction temperature remains within the 185 °C maximum limit during sustained power dissipation or repeated surge events.
How does the 3KASMC28AHM3_B/I differ from the 3KASMC28AHE3_B/I?
The 3KASMC28AHM3_B/I and 3KASMC28AHE3_B/I share identical electrical specifications (VWM = 28 V, VC = 45.4 V, PPPM = 3000 W) and SMC package, but differ in material composition: HM3 is halogen-free and HE3 is not. Both are RoHS-compliant and AEC-Q101 qualified, but only HM3 meets halogen-free mandates required by certain automotive OEMs. The "B/I" suffix indicates 13-inch tape-and-reel packaging (3500 units per reel) for both variants.
3KASMC28AHM3_B/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:
- Active
- 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 (SMC)
3KASMC28AHM3_B/I FAQ
1.How can I place an order for 3KASMC28AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC28AHM3_B/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 3KASMC28AHM3_B/I reliable?
The price and inventory of 3KASMC28AHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC28AHM3_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC28AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC28AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC28AHM3_B/I?
3KASMC28AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC28AHM3_B/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 3KASMC28AHM3_B/I?
For technical support, including 3KASMC28AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC28AHM3_B/I requirements.
6.How does Aetrix verify that 3KASMC28AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC28AHM3_B/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 3KASMC28AHM3_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC28AHM3_B/I?
All 3KASMC28AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC28AHM3_B/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 3KASMC28AHM3_B/I part is unused and in its original packaging.
Return procedure for 3KASMC28AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC28AHM3_B/I Tags
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