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Vishay General Semiconductor - Diodes Division 3KASMC24AHM3_B/I
- Part No.:
- 3KASMC24AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC24AHM3_B/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,550
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Product details
Overview
3KASMC24AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in SMC (DO-214AB) package, rated for 24 V stand-off voltage (VWM), 28.1 V nominal breakdown (VBR), 3000 W peak pulse power (10/1000 μs), and 185 °C maximum junction temperature-designed for automotive-grade overvoltage protection of sensor signal lines and MOSFET gates.
For engineers reviewing the 3KASMC24AHM3_B/I datasheet, 3KASMC24AHM3_B/I pinout, 3KASMC24AHM3_B/I application, or 3KASMC24AHM3_B/I equivalent, key selection criteria include clamping voltage at rated surge current, thermal resistance (RθJL = 18.3 °C/W), AEC-Q101 qualification status, and halogen-free RoHS compliance per ordering suffix HM3.
Technical Context
This device employs passivated anisotropic rectifier technology to achieve stable clamping under repetitive transients and high-temperature operation up to TJ = 185 °C. Its unidirectional polarity and low incremental surge resistance enable precise voltage limiting during inductive load switching events.
The 3KASMC24AHM3_B/I delivers 38.9 V maximum clamping voltage (VC) at 77.1 A peak pulse current (IPPM), with 0.087 %/°C temperature coefficient of VBR and 77.5 °C/W junction-to-ambient thermal resistance-optimized for PCB-mounted protection without heatsinking in constrained automotive ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum reverse voltage before clamping begins; defines safe operating window for protected circuitry. |
| VBR (nom) | 28.1 V - Breakdown voltage at 1 mA test current; ensures reliable turn-on during fast transients. |
| VC @ IPPM | 38.9 V - Clamping voltage at 77.1 A surge; limits stress on downstream ICs during 10/1000 μs pulses. |
| PPPM | 3000 W - Peak pulse power handling; supports robust protection against ISO 7637-2 Load Dump and ESD events. |
| TJ max | 185 °C - Enables operation in under-hood automotive environments without derating. |
| RθJL | 18.3 °C/W - Low junction-to-lead thermal resistance; improves power dissipation capability on standard copper pads. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronics reliability per JESD22-A108. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, cathode indicated by color band. Complies with UL 94 V-0, MSL Level 1, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side reference; enables unidirectional clamping from cathode to anode. |
| Cathode | Protected line connection point | Connected to signal/power line requiring transient suppression; voltage clamping occurs between cathode and anode. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design ensures stable VBR drift ≤ ±5 % over 1000 hrs at TJ = 150 °C. |
| High-temperature capability | Rated for continuous operation at TJ = 185 °C-enables placement near heat sources in engine control units. |
| Surge robustness | Withstands 200 A non-repetitive forward surge (8.3 ms half-sine), supporting high-energy inductive kickback. |
| Low clamping ratio | VC/VBR = 1.38 - Minimizes overvoltage margin while maintaining margin above VWM for noise immunity. |
| Halogen-free & RoHS | HM3 suffix confirms compliance with JEDEC JS709E and RoHS Directive 2011/65/EU. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine management systems exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between sensor output and microcontroller ADC input. Use Value: Limits transient excursions to ≤38.9 V during 3000 W surges, preserving ADC integrity and preventing latch-up. | Use Scenario: Safeguarding gate drive signals feeding IGBTs in variable-frequency drives subjected to cross-talk and Miller-induced spikes. IC Role / Device Role / Timing Role: Fast-response clamping device on isolated gate driver outputs. Use Value: Sub-1 ns response time prevents false turn-on; 185 °C rating allows mounting directly on gate driver PCBs near power stages. |
| Telecom Power Interface | Automotive Body Control Module |
Use Scenario: Shielding 24 V DC power inputs of PoE-powered network switches from lightning-induced surges on building wiring. IC Role / Device Role / Timing Role: Primary-level transient suppressor on main DC input rail prior to DC/DC converter. Use Value: 3000 W PPPM rating handles multi-kA induced surges; RθJL = 18.3 °C/W enables direct pad-mounting without thermal vias. | Use Scenario: Securing LIN bus transceiver I/O pins in door module ECUs against ESD and battery reversal transients. IC Role / Device Role / Timing Role: Unidirectional TVS on LIN data line (cathode to line, anode to ground). Use Value: 24 V VWM matches LIN supply; 1.0 μA IR at VWM preserves bus idle voltage level and avoids false wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHE3_A/H | Same VWM/VBR/VC specs but lower PPPM (400 W); SOD-123FL package; no AEC-Q101 qualification. | Not suitable for automotive under-hood use; limited to consumer/industrial low-energy interfaces. | Select only for cost-sensitive, non-automotive designs where 400 W surge capacity suffices. |
| SMCJ24AHE3_A/H | Identical SMC package and 3000 W rating, but HE3 suffix only (not HM3); RoHS-compliant but not halogen-free. | Acceptable for automotive if halogen-free requirement is waived; same thermal and electrical performance. | Choose when halogen-free material is not mandated, offering identical protection with broader distributor availability. |
Compared with SMAJ24AHE3_A/H and SMCJ24AHE3_A/H, the 3KASMC24AHM3_B/I uniquely combines AEC-Q101 qualification, halogen-free construction, and 185 °C operation-making it the sole option for thermally demanding, safety-critical automotive modules requiring full material compliance.
Availability
3KASMC24AHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial motor drive inputs, and telecom power interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 3KASMC24AHM3_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, and MOSFETs with emphasis on high-reliability, high-temperature, and automotive-qualified devices.
The 3KASMCxxA family was engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive electronics-including engine control, body electronics, and ADAS sensor interfaces-where thermal stability and surge robustness are non-negotiable.
FAQ
What is the clamping voltage of the 3KASMC24AHM3_B/I at its rated peak pulse current?
The 3KASMC24AHM3_B/I has a maximum clamping voltage (VC) of 38.9 V at 77.1 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components remain within safe voltage limits during surge events. The 3KASMC24AHM3_B/I achieves this with low incremental surge resistance and stable junction characteristics up to 185 °C.
Is the 3KASMC24AHM3_B/I qualified for automotive applications?
Yes, the 3KASMC24AHM3_B/I is AEC-Q101 qualified, as confirmed by Vishay's official documentation and ordering code suffix HM3. It meets all stress tests including high-temperature operating life, temperature cycling, and mechanical shock-making it suitable for engine compartment, transmission control, and body electronics modules. The 3KASMC24AHM3_B/I also complies with JESD201 Class 2 whisker resistance and halogen-free material requirements.
What does the "HM3" suffix mean in 3KASMC24AHM3_B/I?
The "HM3" suffix in 3KASMC24AHM3_B/I indicates halogen-free, RoHS-compliant construction and AEC-Q101 qualification. It distinguishes the part from HE3-suffix variants (RoHS-compliant but not halogen-free) and confirms compliance with JEDEC JS709E and automotive material standards. The 3KASMC24AHM3_B/I uses molding compound meeting UL 94 V-0 and matte tin-plated leads solderable per J-STD-002.
What is the thermal resistance from junction to leads (RθJL) for the 3KASMC24AHM3_B/I?
The 3KASMC24AHM3_B/I has a typical junction-to-leads thermal resistance (RθJL) of 18.3 °C/W, measured under standard conditions. This low value enables effective heat transfer from the silicon die to the PCB copper through the leads, supporting reliable operation at full power without external heatsinking. The 3KASMC24AHM3_B/I maintains this performance across its full -65 °C to +185 °C operating junction temperature range.
How does the 3KASMC24AHM3_B/I differ from the 3KASMC24AHE3_B/I?
The 3KASMC24AHM3_B/I and 3KASMC24AHE3_B/I share identical electrical specifications (VWM, VBR, VC, PPPM) and SMC package, but differ in material compliance: HM3 denotes halogen-free and AEC-Q101-qualified construction, whereas HE3 is RoHS-compliant and AEC-Q101-qualified but not halogen-free. Both meet MSL Level 1 and JESD201 Class 2, but the 3KASMC24AHM3_B/I satisfies stricter automotive material mandates.
3KASMC24AHM3_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):
- 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 (SMC)
3KASMC24AHM3_B/I FAQ
1.How can I place an order for 3KASMC24AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC24AHM3_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 3KASMC24AHM3_B/I reliable?
The price and inventory of 3KASMC24AHM3_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 3KASMC24AHM3_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC24AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC24AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC24AHM3_B/I?
3KASMC24AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC24AHM3_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 3KASMC24AHM3_B/I?
For technical support, including 3KASMC24AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC24AHM3_B/I requirements.
6.How does Aetrix verify that 3KASMC24AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC24AHM3_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 3KASMC24AHM3_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC24AHM3_B/I?
All 3KASMC24AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC24AHM3_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 3KASMC24AHM3_B/I part is unused and in its original packaging.
Return procedure for 3KASMC24AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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