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Vishay General Semiconductor - Diodes Division 3KASMC24AHE3_B/I
- Part No.:
- 3KASMC24AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC24AHE3_B/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,400
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Product details
Overview
3KASMC24AHE3_B/I 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 (VWM), 28.1 V nominal breakdown (VBR), 3000 W peak pulse power (10/1000 μs), and 185 °C maximum junction temperature - designed to protect automotive sensor signal lines and MOSFET gate drivers against inductive switching transients.
For engineers reviewing the 3KASMC24AHE3_B/I datasheet, 3KASMC24AHE3_B/I pinout, 3KASMC24AHE3_B/I application, or 3KASMC24AHE3_B/I equivalent, key selection criteria include clamping voltage (38.9 V at 77.1 A), unidirectional polarity, AEC-Q101 qualification, RoHS compliance, and MSL Level 1 reflow capability up to 260 °C.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with optimized junction passivation for stable operation under high-temperature stress. Its 185 °C TJ max rating supports automotive under-hood environments, and its low incremental surge resistance ensures consistent clamping performance during repetitive 10/1000 μs surges.
The device exhibits a typical VBR temperature coefficient of +0.087 %/°C and achieves 38.9 V clamping voltage at 77.1 A IPPM, with thermal resistance RθJL = 18.3 °C/W enabling effective heat transfer to PCB copper pads per recommended layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (nom) | 28.1 V at 1 mA - precise breakdown threshold ensuring reliable turn-on during overvoltage events |
| VC @ IPPM | 38.9 V at 77.1 A - clamping voltage limiting downstream circuit stress during 3000 W surge |
| PPPM | 3000 W (10/1000 μs) - robust energy absorption capacity for automotive load-dump and ISO 7637-2 pulses |
| TJ max | +185 °C - enables use in high-temperature automotive zones without derating penalties |
| IFSM | 200 A (8.3 ms half-sine) - withstands high-current inrush during fault conditions |
| Polarity | Unidirectional - protects against positive-going transients only; cathode marked by band |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, UL 94 V-0 molding compound, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during clamping | Connected to protected line (e.g., sensor output); conducts when transient exceeds VBR |
| Cathode | Current exit terminal during clamping | Marked by color band; tied to ground or lower-potential rail to shunt surge current safely |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR and leakage across temperature and life cycle |
| AEC-Q101 qualification | Validated reliability for automotive applications including temperature cycling, HTRB, and ESD testing |
| Low RθJL (18.3 °C/W) | Enables efficient thermal conduction to PCB copper, supporting sustained power dissipation without hot-spot formation |
| MSL Level 1 rating | Allows single-pass reflow at 260 °C without moisture-induced damage or popcorn effect |
| 3000 W peak pulse capability | Meets ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 surge immunity requirements for 12 V systems |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Gate Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine control units exposed to load-dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and ground to clamp transients before reaching ADC input or signal conditioner. Use Value: Limits voltage to ≤38.9 V during 77.1 A surges, preventing latch-up or permanent damage to 3.3 V/5 V interface ICs. |
Use Scenario: Safeguarding gate drive signals of N-channel MOSFETs in BLDC motor inverters subject to cross-conduction spikes and Miller-induced ringing. IC Role / Device Role / Timing Role: TVS mounted directly at gate-source terminals to suppress >20 V overshoots caused by fast dV/dt switching. Use Value: Clamps gate-source voltage within safe SOA limits (±20 V) while maintaining <1 ns response time to preserve PWM fidelity. |
| Telecom Power Line Surge Suppression | Computer PSU DC Bus Protection |
|
Use Scenario: Shielding 24 V DC power inputs of PoE-powered switches and base station radios from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on input rail upstream of DC-DC converters and EMI filters. Use Value: Absorbs 3000 W surges without degradation, maintaining VWM = 24 V compatibility with standard telecom supply rails. |
Use Scenario: Secondary-side protection of +12 V and +5 V rails in ATX power supplies against internal switching noise and backfeed transients. IC Role / Device Role / Timing Role: Point-of-load TVS on VRM output to prevent overvoltage damage to CPU/GPU VRMs and memory modules. Use Value: Delivers 38.9 V clamping at full 77.1 A rating, compatible with IPC-2221 Class 2 trace widths and thermal pad layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/5AT | Lower PPPM (400 W), SMA package (smaller thermal mass), VBR = 26.7–29.5 V, same VWM | Limited to low-energy consumer electronics; insufficient for automotive load-dump or industrial motor drive surges | Select only for space-constrained non-automotive designs where 3000 W surge handling is not required |
| SMCJ24AHE3_A/H | Same SMC package, identical electrical specs, but HE3_A/H suffix indicates 7" tape-and-reel (850 pcs) vs. HE3_B/I's 13" reel (3500 pcs) | No functional difference; differs only in packaging format and reel size - same AEC-Q101 qualification and thermal performance | Choose based on production volume and SMT line feeder compatibility, not electrical design |
Compared with SMAJ24A-E3/5AT and SMCJ24AHE3_A/H, the 3KASMC24AHE3_B/I delivers full 3000 W surge capability in a proven automotive-grade SMC package, with verified 185 °C operation and MSL Level 1 process compatibility - making it the preferred choice for high-reliability 12–24 V system protection where energy handling and thermal margin are critical.
Availability
3KASMC24AHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial motor drives, telecom power interfaces, and computer power supply designs requiring stable component supply with AEC-Q101 qualification and high-temperature reliability.
Supply support for 3KASMC24AHE3_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 high-reliability diodes, rectifiers, and protection devices for automotive, industrial, and computing markets.
The 3KASMCxxA family was engineered specifically for high-energy transient suppression in harsh-environment applications, emphasizing AEC-Q101 compliance, 185 °C operation, and robust 3000 W surge capability in the SMC footprint.
FAQ
What is the clamping voltage of the 3KASMC24AHE3_B/I at its rated peak pulse current?
The 3KASMC24AHE3_B/I has a maximum clamping voltage (VC) of 38.9 V at 77.1 A peak pulse current (IPPM), measured using a 10/1000 μs 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 3KASMC24AHE3_B/I maintains this clamping performance across its full operating temperature range.
Is the 3KASMC24AHE3_B/I qualified for automotive applications?
Yes, the 3KASMC24AHE3_B/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet 88480. It meets stress test requirements for temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge (ESD), making it suitable for under-hood and body-control module applications. The 3KASMC24AHE3_B/I also supports TJ = 185 °C continuous operation, exceeding standard automotive grade requirements.
What does the "B/I" suffix mean in 3KASMC24AHE3_B/I?
The "B/I" suffix in 3KASMC24AHE3_B/I indicates two attributes: "B" denotes the revision level (Revision B), and "I" specifies the packaging format - 13-inch diameter plastic tape-and-reel containing 3500 units. This contrasts with "H" suffixes (e.g., 3KASMC24AHE3_B/H), which denote 7-inch reels with 850 units. The 3KASMC24AHE3_B/I shares identical electrical and thermal specifications with other HE3 variants.
Can the 3KASMC24AHE3_B/I be used in bidirectional configurations?
No, the 3KASMC24AHE3_B/I is unidirectional only, as explicitly stated in the Vishay datasheet. It protects against positive-going transients on the cathode-to-anode path and must be oriented with the cathode band toward the protected circuit's ground reference. For bidirectional protection, a separate device such as the 3KASMC24CAHE3_B/I (not offered in this series) would be required - the 3KASMC24AHE3_B/I does not support reverse-polarity clamping.
What is the thermal resistance from junction to leads (RθJL) for the 3KASMC24AHE3_B/I?
The 3KASMC24AHE3_B/I has a typical thermal resistance from junction to leads (RθJL) of 18.3 °C/W, per the Thermal Characteristics table in Vishay datasheet 88480. This value reflects heat transfer efficiency to soldered PCB pads and is critical for calculating junction temperature rise under sustained power dissipation. The 3KASMC24AHE3_B/I relies on proper copper pour and mounting pad layout to achieve this rating.
3KASMC24AHE3_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)
3KASMC24AHE3_B/I FAQ
1.How can I place an order for 3KASMC24AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC24AHE3_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 3KASMC24AHE3_B/I reliable?
The price and inventory of 3KASMC24AHE3_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 3KASMC24AHE3_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC24AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC24AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC24AHE3_B/I?
3KASMC24AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC24AHE3_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 3KASMC24AHE3_B/I?
For technical support, including 3KASMC24AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC24AHE3_B/I requirements.
6.How does Aetrix verify that 3KASMC24AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC24AHE3_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 3KASMC24AHE3_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC24AHE3_B/I?
All 3KASMC24AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC24AHE3_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 3KASMC24AHE3_B/I part is unused and in its original packaging.
Return procedure for 3KASMC24AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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