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Vishay General Semiconductor - Diodes Division 3KASMC20AHE3_B/H
- Part No.:
- 3KASMC20AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC20AHE3_B/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,275
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Product details
Overview
3KASMC20AHE3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in SMC (DO-214AB) package, rated for 20 V stand-off voltage, 22.2–24.5 V breakdown at 1 mA, 3000 W peak pulse power (10/1000 μs), 92.6 A peak surge current, and 32.4 V clamping voltage at IPPM - deployed for automotive power rail and sensor line protection.
For engineers reviewing the 3KASMC20AHE3_B/H datasheet, 3KASMC20AHE3_B/H pinout, 3KASMC20AHE3_B/H application, or 3KASMC20AHE3_B/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, TJ = 185 °C operation, MSL Level 1 rating, and RoHS-compliant matte tin plating per J-STD-002.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under high-temperature transients. Its junction passivation enables reliable operation up to 185 °C and meets AEC-Q101 stress test requirements for automotive under-hood applications.
The device exhibits low incremental surge resistance and fast response time, with clamping performance validated across 10/1000 μs waveforms. Thermal resistance is characterized at RθJA = 77.5 °C/W and RθJL = 18.3 °C/W, supporting design-in on standard PCB pad layouts per JEDEC DO-214AB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/typ/max) | 22.2 / 23.4 / 24.5 V at 1 mA - defines precise breakdown threshold for overvoltage detection |
| PPPM | 3000 W (10/1000 μs) - sustains high-energy transients without failure in automotive load-dump scenarios |
| VC @ IPPM | 32.4 V - clamping voltage during 92.6 A surge, limiting downstream IC stress |
| TJ max. | +185 °C - enables placement near hot components like power MOSFETs or engine control units |
| Polarity | Unidirectional - protects against positive-going transients only; cathode marked by band |
| MSL Level | Level 1 (260 °C peak reflow) - supports standard SMT assembly without moisture sensitivity concerns |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded UL 94 V-0 compound, matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction | Connected to protected circuit ground or low-side return path |
| Cathode | Current exit during reverse clamping | Connected to protected line (e.g., 24 V supply rail or sensor signal); marked by color band |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivated anisotropic rectifier | Enables stable VBR drift ≤0.085 %/°C and long-term reliability under thermal cycling |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive electronics including powertrain, body control, and ADAS sensor interfaces |
| 3000 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surges without degradation |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping, reducing risk of downstream IC latch-up or damage |
| MSL Level 1, 260 °C peak | Eliminates pre-bake requirement and supports high-throughput reflow in automated SMT lines |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs from load-dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive surges above 20 V. Use Value: Clamps to 32.4 V at 92.6 A, limiting stress on downstream DC-DC converters and microcontrollers rated for 36 V absolute max. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and switching noise in factory automation PLCs. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt fast transients before reaching precision ADC front-end. Use Value: Sub-1 ns response time and 32.4 V clamping prevent ADC saturation and data corruption during 8 kV contact ESD events. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding AC/DC adapter inputs against lightning-induced surges (IEC 61000-4-5, 2 kV line-earth). IC Role / Device Role / Timing Role: Primary-side TVS on bulk capacitor input to absorb differential-mode energy before rectification. Use Value: 3000 W rating handles 2 kV/12 Ω combination wave with margin; 185 °C TJ supports enclosed, thermally constrained enclosures. | Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: TVS across motor terminals to clamp flyback voltage spikes during PWM commutation. Use Value: 200 A IFSM withstands repeated 8.3 ms half-sine surges; unidirectional polarity avoids interference with H-bridge control logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/5AT | Lower PPPM (400 W), same VWM (20 V), SMC package, non-AEC-Q101 | Not qualified for automotive; suitable for consumer/industrial where surge energy is lower | Select when cost sensitivity outweighs automotive qualification and surge energy remains below 400 W |
| SMCJ20AHE3_A/H | Same family, higher PPPM (1500 W), identical VWM/VBR/VC, AEC-Q101 qualified | Limited to lower-energy transients; smaller footprint not applicable - same SMC package | Choose if system-level testing confirms 1500 W suffices and tighter BOM consolidation is prioritized |
Compared with SMAJ20A-E3/5AT and SMCJ20AHE3_A/H, the 3KASMC20AHE3_B/H delivers 2× higher surge capacity than SMCJ20AHE3_A/H and full AEC-Q101 compliance unlike SMAJ20A-E3/5AT - making it optimal for high-reliability automotive power domains where both qualification and 3000 W immunity are mandatory.
Availability
3KASMC20AHE3_B/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and telecom power supply hardening requiring stable component supply, AEC-Q101 traceability, and high-temperature operational continuity.
Supply support for 3KASMC20AHE3_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 for high-reliability applications.
The 3KASMC series targets automotive and industrial environments demanding extended temperature operation, AEC-Q101 qualification, and robust transient immunity - specifically engineered for under-hood and factory-floor deployments where thermal stability and surge resilience are critical.
FAQ
What is the clamping voltage of the 3KASMC20AHE3_B/H at its rated peak pulse current?
The 3KASMC20AHE3_B/H has a maximum clamping voltage (VC) of 32.4 V when subjected to its peak pulse current (IPPM) of 92.6 A under a 10/1000 μs waveform. This value is measured per standardized test conditions in the Vishay datasheet (Document Number: 88480) and ensures predictable overvoltage limiting for downstream 36 V-rated components.
Is the 3KASMC20AHE3_B/H qualified for automotive applications?
Yes, the 3KASMC20AHE3_B/H is AEC-Q101 qualified, as confirmed by its HE3 suffix and explicit listing in the "AEC-Q101 qualified available" section of the Vishay datasheet. It is rated for TJ = 185 °C and meets all stress tests required for automotive use, including temperature cycling, humidity bias, and mechanical shock.
What does the "B/H" suffix indicate in 3KASMC20AHE3_B/H?
The "B/H" suffix in 3KASMC20AHE3_B/H denotes the revision code (B) and packaging format (H = 7-inch plastic tape and reel, 850 units per reel). This ordering code aligns with Vishay's standard nomenclature shown in the Ordering Information table (page 3 of Document 88480).
Can the 3KASMC20AHE3_B/H be used in bidirectional protection circuits?
No, the 3KASMC20AHE3_B/H is unidirectional only, as explicitly stated in the Features section of the datasheet. It protects against positive-going transients on the cathode side; for bidirectional protection, a separate device such as a 3KASMC20CAHE3_B/H (if available) or dual-diode configuration would be required.
What is the thermal resistance from junction to ambient for the 3KASMC20AHE3_B/H?
The typical thermal resistance from junction to ambient (RθJA) for the 3KASMC20AHE3_B/H is 77.5 °C/W, measured on the minimum recommended pad layout per JEDEC DO-214AB standards. This value assumes natural convection and guides thermal derating when operating above TA = 25 °C.
3KASMC20AHE3_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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 92.6A
- 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)
3KASMC20AHE3_B/H FAQ
1.How can I place an order for 3KASMC20AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC20AHE3_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 3KASMC20AHE3_B/H reliable?
The price and inventory of 3KASMC20AHE3_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 3KASMC20AHE3_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC20AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC20AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC20AHE3_B/H?
3KASMC20AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC20AHE3_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 3KASMC20AHE3_B/H?
For technical support, including 3KASMC20AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC20AHE3_B/H requirements.
6.How does Aetrix verify that 3KASMC20AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC20AHE3_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 3KASMC20AHE3_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC20AHE3_B/H?
All 3KASMC20AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC20AHE3_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 3KASMC20AHE3_B/H part is unused and in its original packaging.
Return procedure for 3KASMC20AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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