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Vishay General Semiconductor - Diodes Division 3KASMC24AHM3_B/H
- Part No.:
- 3KASMC24AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC24AHM3_B/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,978
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Product details
Overview
3KASMC24AHM3_B/H 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 voltage (VBR), 3000 W peak pulse power (10/1000 μs), 77.1 A peak pulse current (IPPM), and 38.9 V clamping voltage (VC) at IPPM - deployed for automotive sensor line protection and MOSFET gate transient suppression.
For engineers reviewing the 3KASMC24AHM3_B/H datasheet, 3KASMC24AHM3_B/H pinout, 3KASMC24AHM3_B/H application, or 3KASMC24AHM3_B/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, TJ = 185 °C operation, low incremental surge resistance, and halogen-free RoHS-compliant construction per HM3 suffix.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for high-reliability automotive environments. It delivers stable clamping performance across -65 °C to +185 °C junction temperature range and meets MSL level 1 per J-STD-020 with 260 °C reflow peak.
The device operates exclusively in unidirectional mode, features a color-band cathode marking, and achieves 38.9 V clamping at 77.1 A (10/1000 μs), with thermal resistance RθJL = 18.3 °C/W and RθJA = 77.5 °C/W on recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum reverse stand-off voltage before conduction; defines safe operating margin for 24 V rail protection. |
| VBR (nom) | 28.1 V - nominal breakdown voltage at 1 mA test current; ensures predictable turn-on during transients. |
| VC @ IPPM | 38.9 V - clamping voltage at 77.1 A peak pulse; limits downstream voltage stress during 3000 W surge events. |
| PPPM | 3000 W - peak pulse power handling with 10/1000 μs waveform; supports high-energy automotive load dump immunity. |
| TJ max | +185 °C - maximum junction temperature; enables under-hood deployment without derating in harsh environments. |
| Polarity | Unidirectional - blocks reverse current only; suited for DC-biased signal/power lines like sensor supplies or gate drivers. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.11 mm x 6.60 mm body; compatible with automated assembly. |
Pinout & Package
Package: SMC (DO-214AB), molded case meeting UL 94 V-0; matte tin-plated leads solderable per J-STD-002/JESD 22-B102; cathode denoted by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side of protected circuit (e.g., ground or return path). |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to higher-potential side (e.g., 24 V supply or signal line); marked with band. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process enhances long-term reliability under thermal cycling and humidity exposure. |
| AEC-Q101 qualification | Validated for automotive-grade stress testing including HTGB, HTRB, and temperature cycling - required for ECU/sensor modules. |
| Halogen-free & RoHS | HM3 suffix confirms compliance with JEDEC J-STD-020 MSL Level 1 and IEC 61249-2-21 halogen-free standards. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients (e.g., ISO 7637-2 Pulse 1/2a/5a), improving clamping precision. |
| 185 °C TJ capability | Enables direct placement near heat sources (e.g., power converters) without external derating or heatsinking. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 24 V CAN/LIN bus interface ICs from load dump and inductive switching transients in vehicle door modules. IC Role / Device Role: Unidirectional TVS clamp placed between signal line and ground, absorbing >3000 W surges without failure. Use Value: Prevents latch-up or permanent damage to transceivers while maintaining signal integrity below 38.9 V clamping threshold. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and ESD. IC Role / Device Role: Primary overvoltage protection element on field-side input terminals, mounted directly at connector entry point. Use Value: Withstands repeated 77.1 A pulses (10/1000 μs) without parameter shift, ensuring decades-long field reliability. |
| Automotive Camera Power Supply | Motor Drive Gate Driver Protection |
Use Scenario: Shielding 24 V power rails feeding ADAS camera modules from battery transients during cold-cranking or jump-start conditions. IC Role / Device Role: Standoff-rated TVS in parallel with bulk capacitance, clamping spikes before they reach image sensor power domains. Use Value: 24 V VWM provides headroom above nominal rail; 185 °C rating allows placement near camera housing heat sources. |
Use Scenario: Protecting high-side N-channel MOSFET gate drivers in 24 V BLDC motor inverters from Miller-induced voltage spikes. IC Role / Device Role: Fast-response unidirectional suppressor between gate and source, limiting dv/dt-induced false turn-on. Use Value: Sub-nanosecond response time and low clamping voltage (38.9 V) prevent gate oxide overstress during switching transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHE3_A/H | Same VWM (24 V), lower PPPM (400 W), smaller SMA package (DO-214AC), non-AEC-Q101, no halogen-free designation | Suitable for cost-sensitive industrial PCBs where space is constrained but automotive qualification is not required | Select when footprint size is critical and 400 W surge immunity suffices; avoid in under-hood automotive use. |
| SMCJ24AHE3_A/H | Same VWM (24 V), identical SMC package, 3000 W PPPM, AEC-Q101 qualified, but HE3 suffix (not HM3) - RoHS-compliant but not halogen-free | Drop-in replacement for 3KASMC24AHM3_B/H where halogen-free requirement is waived | Choose when AEC-Q101 and SMC form factor are mandatory but halogen-free compliance is optional. |
Compared with SMAJ24AHE3_A/H and SMCJ24AHE3_A/H, the 3KASMC24AHM3_B/H uniquely combines 3000 W surge capability, AEC-Q101 qualification, halogen-free construction, and 185 °C operation - making it the only option qualified for next-generation automotive sensor hubs requiring full material compliance and extended thermal margin.
Availability
3KASMC24AHM3_B/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, ADAS camera power systems, and motor drive gate protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for 3KASMC24AHM3_B/H 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 3KASMCxxA series belongs to Vishay's PAR® family of high-power surface-mount TVS diodes, engineered specifically for automotive and industrial environments demanding AEC-Q101 qualification, 185 °C operation, and robust 10/1000 μs surge immunity.
FAQ
What is the clamping voltage of the 3KASMC24AHM3_B/H at its rated peak pulse current?
The 3KASMC24AHM3_B/H has a maximum clamping voltage (VC) of 38.9 V at its rated peak pulse current (IPPM) of 77.1 A, measured using the standard 10/1000 μs double-exponential waveform. This value is guaranteed per the Vishay datasheet revision 19-Jan-2024 and defines the upper voltage limit imposed on protected circuits during worst-case surge events. The 3KASMC24AHM3_B/H maintains this clamping performance across its full operating temperature range up to +185 °C junction temperature.
Is the 3KASMC24AHM3_B/H qualified to AEC-Q101, and what does the 'HM3' suffix indicate?
Yes, the 3KASMC24AHM3_B/H is fully AEC-Q101 qualified, as confirmed in the Vishay datasheet Document Number 88480. The 'HM3' suffix denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-020 MSL Level 1 and passing JESD 201 Class 2 whisker testing. This distinguishes it from HE3-suffixed variants, which are RoHS-compliant but not halogen-free - a critical distinction for automotive Tier 1 suppliers enforcing strict material declarations.
What is the thermal resistance from junction to leads (RθJL) for the 3KASMC24AHM3_B/H, and why does it matter in PCB layout?
The 3KASMC24AHM3_B/H has a typical junction-to-leads thermal resistance (RθJL) of 18.3 °C/W, per the Vishay datasheet. This parameter quantifies how effectively heat transfers from the silicon die to the PCB copper through the leads - critical for managing power dissipation during repetitive surge events. Layouts must follow the minimum recommended pad dimensions (0.126" × 0.060") to achieve this value; undersized pads increase RθJA and risk thermal runaway during sustained transient activity.
Can the 3KASMC24AHM3_B/H be used in bidirectional configurations?
No, the 3KASMC24AHM3_B/H is strictly unidirectional, as explicitly stated in the Vishay datasheet under FEATURES and PRIMARY CHARACTERISTICS. It conducts only in forward bias and clamps in reverse bias - it lacks symmetrical breakdown behavior required for bidirectional protection. For AC or dual-polarity signal lines, a separate bidirectional TVS (e.g., SMBJ24CA) or back-to-back unidirectional configuration would be necessary; the 3KASMC24AHM3_B/H must be oriented with cathode toward the higher-potential node.
What is the maximum leakage current of the 3KASMC24AHM3_B/H at its stand-off voltage and elevated temperature?
At its 24 V stand-off voltage (VWM) and ambient temperature (TA = 25 °C), the 3KASMC24AHM3_B/H exhibits a maximum reverse leakage current (IR) of 1.0 μA. At elevated junction temperature (TJ = 150 °C), the datasheet specifies a maximum leakage (ID) of 10 μA under the same VWM condition. This low leakage ensures minimal power loss in always-on automotive modules and avoids false triggering in high-impedance sensing circuits - a key advantage over older TVS technologies.
3KASMC24AHM3_B/H 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 (SMCJ)
3KASMC24AHM3_B/H FAQ
1.How can I place an order for 3KASMC24AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC24AHM3_B/H 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/H reliable?
The price and inventory of 3KASMC24AHM3_B/H 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/H is usually 5 days.
3.What payment methods are accepted for 3KASMC24AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC24AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC24AHM3_B/H?
3KASMC24AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC24AHM3_B/H 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/H?
For technical support, including 3KASMC24AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC24AHM3_B/H requirements.
6.How does Aetrix verify that 3KASMC24AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC24AHM3_B/H 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/H meets industry standards.
7.What is the process for return or replacement of 3KASMC24AHM3_B/H?
All 3KASMC24AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC24AHM3_B/H, 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/H part is unused and in its original packaging.
Return procedure for 3KASMC24AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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