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Vishay General Semiconductor - Diodes Division 3KASMC22HE3/9AT
- Part No.:
- 3KASMC22HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC22HE3/9AT.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,993
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Product details
Overview
3KASMC22HE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000 W peak pulse power (10/1000 μs), 22 V stand-off voltage (VWM), and 35.5 V clamping voltage (VC) at 84.5 A peak surge current. It operates up to 185 °C junction temperature and is AEC-Q101 qualified for automotive power line protection.
For engineers reviewing the 3KASMC22HE3/9AT datasheet, 3KASMC22HE3/9AT pinout, 3KASMC22HE3/9AT application, or 3KASMC22HE3/9AT equivalent, key selection criteria include clamping performance under 8.3 ms surge, thermal resistance (RθJA = 77.5 °C/W), unidirectional polarity, MSL Level 1 rating, and compatibility with high-reliability automotive PCB layouts.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its 185 °C maximum junction temperature and AEC-Q101 qualification support operation in under-hood automotive environments where thermal derating and long-term reliability are critical.
The device delivers 35.5 V clamping voltage at 84.5 A (10/1000 μs), with 24.4–26.9 V breakdown range (VBR) and only 1.0 μA reverse leakage at 22 V (VWM). Its DO-214AB package enables high-power dissipation (6.0 W on infinite heatsink) while meeting UL 94 V-0 flammability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 24.4 V / 26.9 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 35.5 V - Clamped voltage during 84.5 A 10/1000 μs surge, limiting downstream IC stress |
| PPPM | 3000 W - Peak pulse power handling capability per standard 10/1000 μs waveform |
| TJ max. | 185 °C - Enables use in high-ambient automotive engine control units without thermal shutdown |
| RθJA | 77.5 °C/W - Thermal resistance from junction to ambient, informs board-level heatsinking needs |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional polarity indicated by cathode band. Matte tin-plated leads, RoHS-compliant, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground | Connected to system ground; forms current path during reverse-biased clamping event |
| Cathode | High-side connection to protected line (e.g., 12 V rail) | Marked by color band; reverse-biased during overvoltage, shunting surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| 3000 W peak pulse power (10/1000 μs) | Protects against ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 surges without failure |
| 185 °C junction temperature rating | Supports placement near heat sources in automotive ECUs without derating penalties beyond datasheet curves |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage exposure to downstream MOSFETs or CAN transceivers during transients |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-induced popcorn cracking |
| 0.211 g unit weight, 13" tape & reel (9AT) | Optimized for high-speed SMT placement with consistent feed reliability and traceable lot control |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power rails in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND, clamping transients faster than fuse response time. Use Value: Limits voltage to ≤35.5 V during 84.5 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic supplies. |
Use Scenario: Shielding analog front-end inputs of pressure/temperature sensors in factory automation PLCs from inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) TVS on signal lines, grounded via short trace to minimize loop area. Use Value: Maintains signal integrity below 22 V stand-off while suppressing >1 kV fast transients without loading millivolt-level sensor outputs. |
| Telecom DC Power Feeds | Consumer Power Adapter Outputs |
Use Scenario: Safeguarding PoE-powered Ethernet switch ports against lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converter, sized for 3000 W peak energy absorption. Use Value: Withstands repeated 10/1000 μs surges up to 3 kV without degradation, verified per IEC 61000-4-5 Level 4. |
Use Scenario: Secondary-side overvoltage suppression on 5 V/9 V USB-C adapter outputs to prevent damage to connected devices. IC Role / Device Role / Timing Role: Final-stage TVS after regulation, absorbing residual switching spikes and ESD events. Use Value: 1.0 μA leakage at 22 V ensures no standby current drain; 35.5 V clamping protects USB PD controllers from overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Lower PPPM (400 W), same DO-214AC (SMA) package, VC = 35.5 V at 11.8 A | Not suitable for ISO 7637-2 Pulse 5a (load dump); limited to lower-energy transients | Select when cost sensitivity outweighs surge robustness and board space allows larger footprint |
| SMCJ22A | Same DO-214AB (SMC) package, identical VWM/VC, but rated for 1500 W PPPM (half the 3KASMC22HE3/9AT rating) | Requires parallel placement for equivalent 3000 W capacity; increases BOM count and layout complexity | Choose only if legacy design reuse mandates SMCJ-series footprint compatibility without performance upgrade |
Compared with SMAJ22A and SMCJ22A, the 3KASMC22HE3/9AT delivers double the surge power handling in the same SMC package, enabling single-device compliance with automotive load dump standards without thermal stacking or parallel devices.
Availability
3KASMC22HE3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC feed surge suppression requiring stable component supply across multi-year production cycles.
Supply support for 3KASMC22HE3/9AT 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with focus on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMC family targets high-energy transient suppression in harsh environments, specifically engineered to meet AEC-Q101 and ISO 7637-2 requirements for modern vehicle electrical systems.
FAQ
What is the maximum clamping voltage of the 3KASMC22HE3/9AT under surge conditions?
The 3KASMC22HE3/9AT exhibits a maximum clamping voltage (VC) of 35.5 V when subjected to its rated 84.5 A peak pulse current (IPPM) using the standard 10/1000 μs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during transient events. The 3KASMC22HE3/9AT maintains this clamping performance across its full operating temperature range, supporting robust design margins in automotive applications.
Is the 3KASMC22HE3/9AT suitable for automotive under-hood applications?
Yes, the 3KASMC22HE3/9AT is explicitly AEC-Q101 qualified and rated for 185 °C maximum junction temperature, making it suitable for under-hood automotive applications such as engine control units, body control modules, and ADAS power supplies. Its DO-214AB package supports high thermal dissipation, and its 3000 W surge rating meets ISO 7637-2 Pulse 5a (load dump) requirements. The 3KASMC22HE3/9AT has undergone validated testing for temperature cycling, high-temperature reverse bias, and mechanical shock per AEC-Q101.
What does the "9AT" suffix indicate in the 3KASMC22HE3/9AT part number?
"9AT" denotes the preferred packaging configuration: 13-inch diameter plastic tape and reel, containing 3500 units per reel. This format is optimized for high-volume SMT assembly lines, ensuring consistent feeding and placement accuracy. The "HM3" base code in 3KASMC22HE3/9AT confirms RoHS compliance and AEC-Q101 qualification, while "E3" indicates matte tin plating per J-STD-002. The 3KASMC22HE3/9AT's 0.211 g unit weight aligns with automated pick-and-place machine specifications.
How does the thermal resistance of the 3KASMC22HE3/9AT affect PCB layout?
The 3KASMC22HE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W when mounted on the minimum recommended pad layout. To maintain safe junction temperatures under continuous 6.0 W power dissipation, designers must provide adequate copper area-typically ≥100 mm² of 2 oz copper connected to both terminals-and avoid thermal isolation. The 3KASMC22HE3/9AT's RθJL of 18.3 °C/W further emphasizes the need for short, wide traces to leads to maximize heat conduction to the PCB plane.
Does the 3KASMC22HE3/9AT have bidirectional capability?
No, the 3KASMC22HE3/9AT is strictly unidirectional, as confirmed in the Vishay datasheet revision 05-Mar-13. It features a cathode band marking and conducts only during reverse-bias overvoltage events. For AC line or bidirectional signal protection, a separate device such as a bidirectional TVS (e.g., 3KASMC22AHE3/9AT variant) would be required. The 3KASMC22HE3/9AT's unidirectional architecture provides lower leakage (1.0 μA at 22 V) and tighter clamping control compared to bidirectional equivalents.
3KASMC22HE3/9AT 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 76.1A
- 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)
3KASMC22HE3/9AT FAQ
1.How can I place an order for 3KASMC22HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC22HE3/9AT 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 3KASMC22HE3/9AT reliable?
The price and inventory of 3KASMC22HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC22HE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC22HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC22HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC22HE3/9AT?
3KASMC22HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC22HE3/9AT 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 3KASMC22HE3/9AT?
For technical support, including 3KASMC22HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC22HE3/9AT requirements.
6.How does Aetrix verify that 3KASMC22HE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC22HE3/9AT 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 3KASMC22HE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC22HE3/9AT?
All 3KASMC22HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC22HE3/9AT, 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 3KASMC22HE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC22HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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