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Vishay General Semiconductor - Diodes Division 3KASMC22AHM3/57T
- Part No.:
- 3KASMC22AHM3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC22AHM3/57T.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
3KASMC22AHM3/57T from Vishay General Semiconductor is a unidirectional surface-mount PAR® 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 maximum 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 electronics protection.
For engineers reviewing the 3KASMC22AHM3/57T datasheet, 3KASMC22AHM3/57T pinout, 3KASMC22AHM3/57T application, or 3KASMC22AHM3/57T equivalent, key selection criteria include clamping performance under 10/1000 μs transients, thermal reliability at TJ = 185 °C, unidirectional polarity compatibility with DC-biased signal lines, and RoHS-compliant, whisker-tested matte tin terminations.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its junction passivation enables reliable operation at TJ = 185 °C, meeting AEC-Q101 stress test requirements for automotive under-hood applications.
The device delivers precise clamping with VC = 35.5 V at IPPM = 84.5 A (10/1000 μs), while maintaining low reverse leakage (IR ≤ 1.0 μA at VWM = 22 V, TA = 25 °C) and fast response time - typical of silicon avalanche diodes used in transient suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected circuitry. |
| VBR (min/max) | 24.4 V / 26.9 V - Breakdown voltage range at 1 mA test current; ensures consistent avalanche initiation across production lots. |
| VC @ IPPM | 35.5 V at 84.5 A - Clamping voltage during 10/1000 μs surge; limits downstream IC voltage stress to safe levels. |
| PPPM | 3000 W - Peak pulse power handling capability; supports robust protection against ISO 7637-2 Load Dump and similar automotive transients. |
| TJ max. | 185 °C - Maximum junction temperature rating; enables use in high-ambient environments like engine control units without derating. |
| Polarity | Unidirectional - Designed for DC-biased lines only; cathode band denotes terminal polarity for correct PCB orientation. |
| RθJA | 77.5 °C/W - Junction-to-ambient thermal resistance on standard pad layout; informs board-level thermal design for sustained power dissipation. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, RoHS-compliant, matte tin-plated leads, MSL Level 1 (260 °C peak reflow), JESD201 Class 2 whisker tested.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side of protected line; forms cathode-grounded clamp configuration in unidirectional operation. |
| Cathode | Current exit point during forward conduction; clamping node | Marked by color band; tied to system ground or reference rail; carries full surge current during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable avalanche characteristics and long-term reliability at TJ = 185 °C, critical for automotive under-hood deployment. |
| AEC-Q101 qualification | Validates performance under accelerated stress tests including HTGB, HTRB, and temperature cycling - required for automotive ECUs and ADAS modules. |
| 3000 W peak pulse power (10/1000 μs) | Meets ISO 7637-2 Pulse 5a (Load Dump) energy requirements for 12 V systems without external series impedance. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving protection fidelity for sensitive microcontrollers and sensors. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard SMT reflow without baking, reducing manufacturing overhead and yield risk. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and body control module inputs from load dump and jump-start surges in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground, clamping transients before they reach downstream LDOs and MCU I/O pins. Use Value: Withstands 3000 W pulses and operates reliably at TJ = 185 °C, enabling direct placement near battery-fed circuits without thermal derating. | Use Scenario: Safeguarding analog outputs of pressure and temperature sensors in factory automation PLC I/O modules exposed to relay coil flyback. IC Role / Device Role / Timing Role: Clamp diode on 24 V sensor supply line, shunting inductive kickback energy away from precision ADC front-ends. Use Value: Low clamping voltage (VC = 35.5 V) prevents overvoltage damage to 36 V-rated op-amps and SAR ADCs while maintaining signal integrity. |
| Telecom DC Power Input Protection | Consumer Device USB Power Path Protection |
Use Scenario: Securing 48 V PoE-powered Ethernet switches against lightning-induced surges on primary DC input rails. IC Role / Device Role / Timing Role: Primary-stage TVS on bulk input, coordinated with upstream fuses and secondary-stage polymer PTCs. Use Value: High IPPM (84.5 A) and low Rsurge ensure effective energy diversion before upstream OVP circuits trip, minimizing downtime. | Use Scenario: Adding overvoltage resilience to USB-C PD power delivery paths in portable monitors and docking stations. IC Role / Device Role / Timing Role: Unidirectional clamp on VBUS line, positioned after E-Marker IC but before buck converter input. Use Value: Fast response and 22 V VWM allow compatibility with 20 V PD3.0 profiles while preventing latch-up in USB PD controllers during hot-plug transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/57T | Lower PPPM (400 W), higher VC (35.5 V same), same VWM (22 V), DO-214AC (SMA) package | Limited to lower-energy transients (e.g., ESD, IEC 61000-4-2); not suitable for automotive load dump | Select when cost-sensitive consumer designs require basic ESD/EMI suppression without high-power surge needs. |
| SMCJ22AHE3/57T | Same PPPM (3000 W), same VWM (22 V), same DO-214AB (SMC) package, but higher VC (36.0 V vs. 35.5 V) and no AEC-Q101 qualification | Acceptable for industrial power supplies but excluded from automotive safety-critical modules requiring AEC-Q101 evidence | Choose for non-automotive 12–24 V systems where AEC-Q101 is not mandated and 0.5 V clamping margin is acceptable. |
Compared with SMAJ22A-E3/57T and SMCJ22AHE3/57T, the 3KASMC22AHM3/57T uniquely combines 3000 W surge capability, AEC-Q101 qualification, and 35.5 V clamping in a single DO-214AB device - making it the only option among the three validated for automotive-grade load dump protection without design compromise.
Availability
3KASMC22AHM3/57T is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, telecom DC power input protection, and consumer device USB power path protection requiring stable component supply and long-term lifecycle support.
Supply support for 3KASMC22AHM3/57T 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, MOSFETs, and TVS devices with emphasis on reliability, high-temperature operation, and automotive qualification.
The 3KASMC series is part of Vishay's PAR® (Protected Avalanche Rectifier) platform, engineered specifically for high-energy transient suppression in harsh-environment applications including automotive engine control, industrial motor drives, and telecom infrastructure.
FAQ
What is the clamping voltage of the 3KASMC22AHM3/57T at its rated peak pulse current?
The 3KASMC22AHM3/57T has a maximum clamping voltage (VC) of 35.5 V at its rated peak pulse current (IPPM) of 84.5 A, measured using the standard 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and ensures predictable overvoltage limiting for downstream components in the protected circuit.
Is the 3KASMC22AHM3/57T suitable for automotive applications?
Yes, the 3KASMC22AHM3/57T is AEC-Q101 qualified and rated for TJ = 185 °C, making it suitable for automotive applications including engine control units, body electronics, and ADAS modules. Its DO-214AB package, matte tin terminations, and MSL Level 1 rating further support automated SMT assembly in automotive production environments.
What does the "HM3/57T" suffix indicate in 3KASMC22AHM3/57T?
The "HM3" suffix denotes Vishay's RoHS-compliant, AEC-Q101-qualified base part designation with JESD201 Class 2 whisker-tested matte tin plating. The "57T" indicates packaging in 7-inch diameter plastic tape and reel, with a base quantity of 850 units per reel - optimized for high-volume SMT placement equipment.
How does the thermal resistance of the 3KASMC22AHM3/57T affect PCB layout?
The 3KASMC22AHM3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W on the recommended minimum pad layout. To maintain TJ ≤ 185 °C during repetitive surges, designers must provide adequate copper area and thermal vias - especially when operating near its 6.0 W steady-state power dissipation limit at TL = 75 °C.
Can the 3KASMC22AHM3/57T be used in bidirectional signal line protection?
No, the 3KASMC22AHM3/57T is unidirectional only, as confirmed in its datasheet features and electrical characteristics table. For bidirectional protection (e.g., RS-485, CAN bus), a separate bidirectional TVS such as SMBJ22CA or SMCJ22CA must be selected - the 3KASMC22AHM3/57T will conduct continuously if reverse-biased beyond its VWM, risking failure.
3KASMC22AHM3/57T 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:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 84.5A
- 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)
3KASMC22AHM3/57T FAQ
1.How can I place an order for 3KASMC22AHM3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC22AHM3/57T 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 3KASMC22AHM3/57T reliable?
The price and inventory of 3KASMC22AHM3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC22AHM3/57T is usually 5 days.
3.What payment methods are accepted for 3KASMC22AHM3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC22AHM3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC22AHM3/57T?
3KASMC22AHM3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC22AHM3/57T 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 3KASMC22AHM3/57T?
For technical support, including 3KASMC22AHM3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC22AHM3/57T requirements.
6.How does Aetrix verify that 3KASMC22AHM3/57T is sourced from the original manufacturer or authorized distributors?
All 3KASMC22AHM3/57T 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 3KASMC22AHM3/57T meets industry standards.
7.What is the process for return or replacement of 3KASMC22AHM3/57T?
All 3KASMC22AHM3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC22AHM3/57T, 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 3KASMC22AHM3/57T part is unused and in its original packaging.
Return procedure for 3KASMC22AHM3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC22AHM3/57T Tags
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