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Vishay General Semiconductor - Diodes Division 3KASMC24HE3/9AT
- Part No.:
- 3KASMC24HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC24HE3/9AT.pdf
- Description:
- TVS DIODE 24VWM 43VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,275
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Product details
Overview
3KASMC24HE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 24 V stand-off voltage (VWM), 26.7–29.5 V breakdown (VBR), 3000 W peak pulse power (10/1000 μs), 77.1 A peak surge current (IPPM), and 38.9 V clamping voltage (VC) - designed for automotive-grade overvoltage protection of power rails and signal lines.
For engineers reviewing the 3KASMC24HE3/9AT datasheet, 3KASMC24HE3/9AT pinout, 3KASMC24HE3/9AT application, or 3KASMC24HE3/9AT equivalent, this device delivers AEC-Q101 qualification, TJ = 185 °C operation, MSL Level 1 moisture sensitivity, and robust clamping performance in high-reliability automotive and industrial power systems where fast response (<1 ns), low incremental surge resistance, and stable thermal behavior are critical.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve high-temperature junction stability up to 185 °C and excellent clamping linearity under repetitive transients. Its unidirectional polarity and DO-214AB package support high-current surge handling (200 A IFSM) with minimal forward voltage drop (VF = 3.5 V at 100 A).
The device operates within -65 °C to +185 °C junction temperature range and exhibits RθJA = 77.5 °C/W and RθJL = 18.3 °C/W thermal resistance - enabling reliable thermal management on standard PCB layouts without heatsinking in most automotive power rail applications.
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 IT = 1.0 mA - precise breakdown threshold ensures predictable turn-on during transients. |
| PPPM | 3000 W (10/1000 μs) - handles high-energy surges common in automotive load-dump and inductive switching events. |
| VC @ IPPM | 38.9 V - clamping voltage at 77.1 A peak current; limits downstream IC stress below 40 V in protected circuits. |
| TJ max. | 185 °C - supports under-hood automotive environments and long-term reliability in high-ambient thermal zones. |
| AEC-Q101 | Qualified - meets stress test requirements for automotive electronic components including temperature cycling, HTRB, and ESD. |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and matte tin-plated leads. |
Pinout & Package
DO-214AB (SMC) package: cathode-indicating band at one end; two-terminal device with anode and cathode leads extending from opposite sides of molded body. Mounting pad layout per Vishay specification: 3.20 mm min. width, 1.52 mm min. lead spacing, 4.69 mm max. length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to system ground or low-side reference in unidirectional TVS configuration. | Provides low-impedance path to ground during reverse-transient clamping; must be routed with low-inductance trace to minimize overshoot. |
| Cathode | Current exit point in forward bias; marked by color band; connected to protected line (e.g., 24 V rail or signal input). | Defines polarity-sensitive connection - reversal prevents clamping; correct orientation essential for protection integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure enables stable leakage and breakdown behavior across -65 °C to +185 °C. |
| Clamping ratio (VC/VBR) | ~1.37 - tight ratio ensures minimal overvoltage exposure during surge events without excessive voltage headroom loss. |
| Response time | < 1 ns - enables suppression of fast-rising ESD and switching transients before sensitive downstream circuitry is stressed. |
| Surge robustness | 200 A IFSM (8.3 ms half-sine) - withstands repeated motor-commutation or relay-coil energy without degradation. |
| Moisture sensitivity | MSL Level 1 (260 °C peak reflow) - allows standard SMT assembly without baking or special handling. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in engine control units (ECUs) against ISO 7637-2 load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC/DC converter input. Use Value: Limits transient voltage to ≤38.9 V, preventing damage to 40 V-rated buck controllers and ensuring ASIL-B compliance. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) in factory automation sensors exposed to cable ESD and inductive coupling. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector interface before signal conditioning amplifier. Use Value: Clamps sub-100 ns ESD pulses while maintaining signal integrity via <10 pF junction capacitance at zero bias. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Securing 24 V DC inputs of PoE-powered network switches and base stations against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge arrestor upstream of input filter and hot-swap controller. Use Value: Absorbs 3000 W peak energy without failure, meeting IEC 61000-4-5 Level 4 requirements with single-device simplicity. |
Use Scenario: Shielding microcontroller I/O and gate drivers in smart home appliances (e.g., washing machine motor inverters) from back-EMF spikes. IC Role / Device Role / Timing Role: Localized TVS mounted near motor driver IC output pins. Use Value: Withstands 200 A surge current from brushed motor commutation, eliminating need for external snubbers or RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W), smaller SMA package (DO-214AC), VBR = 26.7–29.5 V, VC = 38.9 V - same electrical clamping but lower surge capacity. | Suitable for space-constrained consumer electronics; insufficient for automotive load-dump duty cycles. | Select when board area is critical and surge energy is limited to <500 W; verify IEC 61000-4-5 compliance per system-level testing. |
| SMCJ24A | Same DO-214AB package, identical VWM/VBR/VC specs, but rated for 1500 W PPPM (10/1000 μs) - half the energy handling of 3KASMC24HE3/9AT. | Valid for industrial controls with moderate surge exposure; lacks AEC-Q101 qualification and 185 °C rating. | Choose for cost-sensitive non-automotive designs where full 3000 W capability is not required and extended temperature operation is unnecessary. |
Compared with SMAJ24A and SMCJ24A, the 3KASMC24HE3/9AT provides double the peak pulse power (3000 W vs. 1500/400 W), AEC-Q101 qualification, and 185 °C junction rating - making it the only option qualified for under-hood automotive deployment with full load-dump immunity.
Availability
3KASMC24HE3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom power supplies, and appliance motor drives requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for 3KASMC24HE3/9AT 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The 3KASMC series belongs to Vishay's PAR® (Protection and Regulation) transient voltage suppressor family, engineered specifically for AEC-Q101-compliant, high-temperature-stable overvoltage protection in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of the 3KASMC24HE3/9AT at its rated peak pulse current?
The 3KASMC24HE3/9AT has a maximum clamping voltage (VC) of 38.9 V at its specified peak pulse current (IPPM) of 77.1 A, measured using a 10/1000 μs waveform. This value ensures that protected circuits remain below critical voltage thresholds during high-energy transients. The 3KASMC24HE3/9AT maintains this clamping performance across its full operating temperature range, supporting robust design margins in automotive and industrial applications.
Is the 3KASMC24HE3/9AT qualified for automotive use?
Yes, the 3KASMC24HE3/9AT is AEC-Q101 qualified and rated for junction temperatures up to 185 °C, making it suitable for under-hood automotive applications such as engine control units, body control modules, and ADAS power supplies. The 3KASMC24HE3/9AT also meets MSL Level 1 per J-STD-020 and is RoHS-compliant, fulfilling key automotive manufacturing and reliability requirements.
What package type does the 3KASMC24HE3/9AT use, and what are its key mechanical features?
The 3KASMC24HE3/9AT uses the DO-214AB (SMC) surface-mount package, measuring 7.75 mm × 6.22 mm with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. It features a cathode band marking, UL 94 V-0 compliant molding compound, and is rated for MSL Level 1 reflow (260 °C peak). The 3KASMC24HE3/9AT's package supports high-current handling and thermal dissipation in compact PCB layouts.
How does the 3KASMC24HE3/9AT compare to standard SMCJ-series TVS diodes?
The 3KASMC24HE3/9AT delivers 3000 W peak pulse power - double the 1500 W rating of standard SMCJ24A devices - while sharing the same DO-214AB package and clamping voltage. It also adds AEC-Q101 qualification and 185 °C junction rating, which SMCJ24A lacks. For designs requiring full ISO 7637-2 load-dump immunity and extended temperature operation, the 3KASMC24HE3/9AT is the technically superior choice over generic SMCJ alternatives.
What is the maximum reverse leakage current of the 3KASMC24HE3/9AT at its stand-off voltage?
The 3KASMC24HE3/9AT specifies a maximum reverse leakage current (IR) of 1.0 μA at its 24 V stand-off voltage (VWM) and 25 °C ambient temperature. At elevated junction temperature (TJ = 150 °C), leakage remains ≤10 μA - confirming stable blocking behavior across automotive operating conditions. This low leakage ensures minimal standby power loss and avoids false triggering in precision sensing circuits using the 3KASMC24HE3/9AT.
3KASMC24HE3/9AT 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:
- 43V
- Current - Peak Pulse (10/1000µs):
- 69.8A
- 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)
3KASMC24HE3/9AT FAQ
1.How can I place an order for 3KASMC24HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC24HE3/9AT 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 3KASMC24HE3/9AT reliable?
The price and inventory of 3KASMC24HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC24HE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC24HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC24HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC24HE3/9AT?
3KASMC24HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC24HE3/9AT 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 3KASMC24HE3/9AT?
For technical support, including 3KASMC24HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC24HE3/9AT requirements.
6.How does Aetrix verify that 3KASMC24HE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC24HE3/9AT 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 3KASMC24HE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC24HE3/9AT?
All 3KASMC24HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC24HE3/9AT, 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 3KASMC24HE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC24HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC24HE3/9AT Tags
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