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Vishay General Semiconductor - Diodes Division 3KASMC24AHE3_B/H
- Part No.:
- 3KASMC24AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC24AHE3_B/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,959
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Product details
Overview
3KASMC24AHE3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in SMC (DO-214AB) package, rated for 24 V stand-off voltage, 26.7–29.5 V breakdown at 1 mA, 38.9 V clamping at 77.1 A peak pulse current, and 3000 W peak pulse power with 10/1000 μs waveform. It operates up to 185 °C junction temperature and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the 3KASMC24AHE3_B/H datasheet, 3KASMC24AHE3_B/H pinout, 3KASMC24AHE3_B/H application, or 3KASMC24AHE3_B/H equivalent, key selection criteria include clamping voltage under surge, thermal resistance (RθJA = 77.5 °C/W), unidirectional polarity, RoHS-compliant HE3 suffix, and compatibility with high-reliability automotive and industrial PCB layouts requiring MSL level 1 and JESD 201 class 2 whisker resistance.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for junction stability at TJ = 185 °C, enabling operation in under-hood automotive environments and high-temperature industrial controls. Its low incremental surge resistance and fast response time ensure effective suppression of transients induced by inductive load switching.
The device delivers 3000 W peak pulse power per 10/1000 μs waveform while maintaining clamping voltage ≤38.9 V at IPPM = 77.1 A, with VF = 3.5 V at 100 A forward surge and RθJL = 18.3 °C/W for efficient lead-to-junction heat transfer in SMC-packaged designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum reverse stand-off voltage before conduction; defines operating margin below breakdown in normal circuit conditions |
| VBR (min/typ/max) | 26.7 / 28.1 / 29.5 V at IT = 1 mA - precise breakdown threshold ensuring predictable turn-on during overvoltage events |
| VC at IPPM | 38.9 V at 77.1 A - clamping voltage limits downstream IC/MOSFET stress during 10/1000 μs surge |
| PPPM | 3000 W - peak pulse power handling capability determines survivability against lightning or ESD-like transients |
| TJ max. | +185 °C - enables use in engine control units, powertrain modules, and other high-temperature automotive zones |
| RθJA | 77.5 °C/W - thermal resistance from junction to ambient; informs heatsinking requirements on standard PCB pad layout |
| AEC-Q101 | Qualified - confirms reliability validation for automotive-grade production applications per stress test standard |
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 JESD 201 class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or clamping | Connected to protected line (e.g., 24 V rail); forms low-impedance path to ground when reverse voltage exceeds VBR |
| Cathode | Current exit terminal during clamping; marked by color band | Connected to system ground; establishes reference for clamping action and ensures correct polarity installation |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design improves long-term stability and leakage performance at elevated temperatures |
| High-temperature operation | TJ = 185 °C rating supports deployment in automotive powertrain, ADAS sensors, and industrial motor drives without derating |
| Peak pulse power | 3000 W capability with 10/1000 μs waveform meets ISO 7637-2 and IEC 61000-4-5 surge immunity requirements |
| Clamping performance | VC = 38.9 V at 77.1 A ensures protected ICs (e.g., CAN transceivers, microcontrollers) remain within safe absolute maximum ratings |
| AEC-Q101 qualification | Validated for automotive use with HE3 suffix indicating RoHS compliance and qualification per AEC stress test protocol |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in engine control units (ECUs) from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp limiting voltage spikes to ≤38.9 V during 3000 W surges. Use Value: Prevents latch-up or permanent damage to MCU, CAN transceivers, and analog front-ends exposed to ISO 7637-2 Pulse 5a. |
Use Scenario: Safeguarding analog signal lines (e.g., 4–20 mA, thermocouple inputs) in PLC I/O modules from field-induced surges. IC Role / Device Role / Timing Role: Fast-response transient suppressor absorbing inductive kickback from solenoid drivers or relay coils. Use Value: Maintains signal integrity and prevents false triggering or ADC saturation during 10/1000 μs transients up to 77.1 A. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding 24 V DC input stages of base station power supplies from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converters and PMICs. Use Value: Limits transient energy to <100 mJ per event via 38.9 V clamping, preserving downstream converter MOSFETs and gate drivers. |
Use Scenario: Suppressing back-EMF from brushed DC motors in smart home appliances (e.g., washing machine drive circuits). IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to shunt inductive energy during commutation. Use Value: Enables reliable operation at TJ = 185 °C near motor windings while meeting IEC 61000-4-4 EFT immunity targets. |
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 | Lower PPPM (400 W), smaller SMA package, higher RθJA (110 °C/W), same VWM/VBR range | Suitable for lower-energy transients; limited to ambient-temperature consumer applications due to thermal constraints | Select when board space is constrained and surge energy remains ≤400 W; not recommended for automotive or high-temp industrial use |
| SMCJ24AHE3_A/H | Same SMC package, identical VWM/VBR/VC specs, but rated for 1500 W PPPM (half of 3KASMC24AHE3_B/H) | Meets basic IEC 61000-4-5 Level 3; insufficient for ISO 7637-2 Load Dump or high-reliability automotive systems | Choose for cost-sensitive industrial controls where full 3000 W headroom is unnecessary and AEC-Q101 is not mandated |
Compared with SMAJ24AHE3_A/H and SMCJ24AHE3_A/H, the 3KASMC24AHE3_B/H provides double the pulse power margin of SMCJ24AHE3_A/H and superior thermal robustness versus SMAJ24AHE3_A/H-critical for sustained operation at 185 °C in automotive ECUs and industrial motor drives.
Availability
3KASMC24AHE3_B/H is available at Aetrix Electronics and suitable for automotive power supply protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply, AEC-Q101 qualification, and high-temperature reliability.
Supply support for 3KASMC24AHE3_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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The 3KASMCxxA family was designed specifically for high-energy transient suppression in harsh-environment applications-targeting automotive, industrial, and telecom systems demanding 185 °C operation and AEC-Q101 validation.
FAQ
What is the clamping voltage of the 3KASMC24AHE3_B/H under maximum rated surge current?
The 3KASMC24AHE3_B/H has a maximum clamping voltage (VC) of 38.9 V at 77.1 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88480) and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The 3KASMC24AHE3_B/H maintains this clamping performance across its specified operating temperature range.
Is the 3KASMC24AHE3_B/H suitable for automotive applications?
Yes, the 3KASMC24AHE3_B/H is AEC-Q101 qualified and features a 185 °C maximum junction temperature, making it suitable for under-hood automotive applications including engine control units, body control modules, and ADAS sensor interfaces. Its HE3 suffix confirms RoHS compliance and qualification per AEC stress test protocols, and the SMC package supports MSL level 1 reflow processing required for automotive PCB assembly.
What does the "HE3_B/H" suffix mean in 3KASMC24AHE3_B/H?
The "HE3" suffix indicates RoHS-compliant construction and AEC-Q101 qualification; "B" denotes revision code; "H" specifies packaging in 7-inch diameter plastic tape and reel with 850 units per reel. This ordering code aligns with Vishay's standardized format for automotive-grade TVS diodes and ensures traceability, thermal reliability, and process compatibility for high-volume SMT manufacturing.
How does the thermal performance of the 3KASMC24AHE3_B/H compare to similar SMC-package TVS diodes?
The 3KASMC24AHE3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W and junction-to-leads (RθJL) of 18.3 °C/W-optimized for high-power dissipation in minimal PCB area. Compared to standard SMC TVS diodes with RθJA > 100 °C/W, the 3KASMC24AHE3_B/H sustains higher surge duty cycles and ambient temperatures without exceeding TJ = 185 °C, especially when mounted on Vishay-recommended pad layout.
Can the 3KASMC24AHE3_B/H replace older-generation 24 V TVS diodes in existing designs?
The 3KASMC24AHE3_B/H is a direct drop-in replacement for legacy 24 V unidirectional TVS diodes in SMC (DO-214AB) package, provided the original design accommodates 3000 W peak pulse power and 38.9 V clamping. Its pinout, footprint, and polarity (cathode band) match industry-standard SMC layout, and the HE3 suffix ensures compatibility with modern RoHS and automotive qualification requirements-no PCB changes are needed.
3KASMC24AHE3_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 (SMC)
3KASMC24AHE3_B/H FAQ
1.How can I place an order for 3KASMC24AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC24AHE3_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 3KASMC24AHE3_B/H reliable?
The price and inventory of 3KASMC24AHE3_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 3KASMC24AHE3_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC24AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC24AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC24AHE3_B/H?
3KASMC24AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC24AHE3_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 3KASMC24AHE3_B/H?
For technical support, including 3KASMC24AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC24AHE3_B/H requirements.
6.How does Aetrix verify that 3KASMC24AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC24AHE3_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 3KASMC24AHE3_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC24AHE3_B/H?
All 3KASMC24AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC24AHE3_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 3KASMC24AHE3_B/H part is unused and in its original packaging.
Return procedure for 3KASMC24AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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