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Vishay General Semiconductor - Diodes Division 3KASMC20AHM3_A/I
- Part No.:
- 3KASMC20AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC20AHM3_A/I.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,028
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Product details
Overview
3KASMC20AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for high-reliability overvoltage protection in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 32.4 V under 92.6 A surge, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and ICs against inductive switching transients.
For engineers reviewing the 3KASMC20AHM3_A/I datasheet, 3KASMC20AHM3_A/I pinout, 3KASMC20AHM3_A/I application, or 3KASMC20AHM3_A/I equivalent, this page provides verified electrical specs, DO-214AB package details, AEC-Q101 qualification status, thermal resistance data, and real-world protection use cases - all confirmed from Vishay's official documentation (Doc #89962, Rev 05-Mar-13).
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional architecture provides forward conduction during positive overvoltage events while blocking reverse current until breakdown at 22.2–24.5 V.
It meets J-STD-020 MSL Level 1 with 260 °C lead-free reflow compatibility and is qualified to AEC-Q101 for automotive underhood applications. The device exhibits 77.5 °C/W junction-to-ambient thermal resistance when mounted on minimum recommended pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 3000 W - sustains high-energy transients without failure in automotive load-dump or inductive kick scenarios |
| Breakdown Voltage VBR | 22.2–24.5 V at 1.0 mA - defines precise clamping onset for 24 V system rail protection |
| Stand-off Voltage VWM | 20 V - ensures no leakage conduction during normal 24 V nominal operation |
| Clamping Voltage VC | 32.4 V at 92.6 A - limits downstream voltage stress to safe levels during worst-case surge |
| Operating Junction Temp. | −65 °C to +185 °C - supports under-hood placement and extended thermal margin in industrial controls |
| Thermal Resistance RθJA | 77.5 °C/W - enables accurate thermal design when using standard SMC pad layout per datasheet Fig. 6 |
| AEC-Q101 Qualified | Yes - certified for automotive electronics per stress test requirements including HTRB, HTGB, and TCT |
Pinout & Package
Package: DO-214AB (SMC), RoHS-compliant, matte tin-plated leads, MSL Level 1, 260 °C peak reflow. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected circuit ground or low-side return path; must handle 200 A IFSM surge |
| Cathode | Current exit terminal; marked with band | Connected to protected line (e.g., 24 V rail); clamps voltage when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Enables stable 185 °C operation and long-term reliability in harsh thermal environments |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin |
| Excellent clamping capability | 32.4 V clamping at 92.6 A ensures downstream components remain within safe SOA limits |
| Fast response time | Sub-nanosecond turn-on protects sensitive gate drivers and microcontrollers from ESD and EFT |
| MSL Level 1 rating | Allows direct placement into lead-free reflow without baking or special handling |
Applications
| Automotive Power Distribution | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in body control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across input rail to absorb 3000 W surges. Use Value: Prevents damage to MCU power supplies and CAN transceivers during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding IGBT gate drivers in variable-frequency drives from inductive turn-off spikes. IC Role / Device Role / Timing Role: Fast-clamping TVS connected between gate and emitter to limit VGE stress. Use Value: Maintains gate oxide integrity by clamping spikes to ≤32.4 V before driver IC saturation occurs. |
| Telecom DC Power Feeds | Consumer Appliance Control Boards |
Use Scenario: Shielding PoE-powered equipment front-end regulators from lightning-induced surges on 48 V DC lines. IC Role / Device Role / Timing Role: Primary overvoltage suppression device on input stage before DC/DC conversion. Use Value: Withstands 10/1000 µs waveforms up to 3000 W, meeting IEC 61000-4-5 Level 4 immunity requirements. |
Use Scenario: Securing microcontroller I/O lines and relay coil flyback paths in smart HVAC control boards. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 20 V) TVS suppressing ESD and relay contact bounce. Use Value: Ensures system-level EMC compliance (IEC 61000-4-2) without increasing standby current or degrading signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A (DO-214AA) | Lower PPPM (600 W), same VWM/VBR, smaller SMB package | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or high-current inductive loads | Select only for space-constrained consumer designs where 3000 W surge immunity is not required |
| SMCJ20A (DO-214AB) | Same package and VWM, but 1500 W PPPM and higher VC (34.0 V @ 44.2 A) | Provides adequate protection for basic 24 V systems but lacks margin for automotive-grade robustness | Choose when cost sensitivity outweighs need for AEC-Q101 qualification and 185 °C operation |
Compared with SMBJ20A and SMCJ20A, the 3KASMC20AHM3_A/I offers double the surge power rating, tighter clamping, full AEC-Q101 qualification, and extended temperature range - making it the only option among the three validated for under-hood automotive deployment.
Availability
3KASMC20AHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive protection, telecom DC feeds, and consumer appliance control boards requiring stable component supply and long-term lifecycle support.
Supply support for 3KASMC20AHM3_A/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 3KASMC series was engineered specifically for AEC-Q101-compliant transient suppression in high-temperature 24 V and 48 V systems - emphasizing ruggedness, repeatable clamping, and process-controlled passivation.
FAQ
What is the maximum clamping voltage of the 3KASMC20AHM3_A/I under rated surge conditions?
The 3KASMC20AHM3_A/I clamps to a maximum of 32.4 V when subjected to its rated peak pulse current of 92.6 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet Table on page 2. Clamping performance remains stable across −65 °C to +185 °C operating junction temperatures, ensuring consistent protection in extreme environments.
Is the 3KASMC20AHM3_A/I suitable for automotive under-hood applications?
Yes, the 3KASMC20AHM3_A/I is AEC-Q101 qualified and rated for continuous operation up to +185 °C junction temperature - meeting critical requirements for engine bay, transmission control, and ADAS power modules. Its DO-214AB package passes MSL Level 1 reflow and its passivated junction ensures long-term reliability under thermal cycling and humidity exposure typical in automotive deployments.
What does the "_A/I" suffix indicate in 3KASMC20AHM3_A/I?
The "_A/I" suffix in 3KASMC20AHM3_A/I denotes the packaging configuration: "I" specifies 13-inch diameter plastic tape and reel with 3500 units per reel, while "A" indicates the base P/NHM3 revision level compliant with AEC-Q101 and RoHS. This ordering code aligns with Vishay's documented delivery mode in Section "ORDERING INFORMATION" (page 2 of Doc #89962).
How does the thermal resistance of the 3KASMC20AHM3_A/I affect PCB layout?
The 3KASMC20AHM3_A/I has a typical RθJA of 77.5 °C/W when mounted on the minimum recommended pad layout per datasheet Figure 6. To maintain safe junction temperature under 6.0 W steady-state dissipation, designers must provide adequate copper area and thermal vias - especially in high-ambient environments like automotive cabins or industrial enclosures where ambient may exceed 85 °C.
Can the 3KASMC20AHM3_A/I replace older SMCJ20A devices in existing designs?
The 3KASMC20AHM3_A/I shares the DO-214AB (SMC) package and identical pinout with SMCJ20A, enabling drop-in replacement in most layouts. However, due to its higher 3000 W PPPM rating, lower clamping voltage (32.4 V vs. 34.0 V), and AEC-Q101 qualification, it improves system robustness - particularly in automotive and industrial applications where surge immunity margins are critical.
3KASMC20AHM3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 83.8A
- 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)
3KASMC20AHM3_A/I FAQ
1.How can I place an order for 3KASMC20AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC20AHM3_A/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 3KASMC20AHM3_A/I reliable?
The price and inventory of 3KASMC20AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC20AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC20AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC20AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC20AHM3_A/I?
3KASMC20AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC20AHM3_A/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 3KASMC20AHM3_A/I?
For technical support, including 3KASMC20AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC20AHM3_A/I requirements.
6.How does Aetrix verify that 3KASMC20AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC20AHM3_A/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 3KASMC20AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC20AHM3_A/I?
All 3KASMC20AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC20AHM3_A/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 3KASMC20AHM3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC20AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC20AHM3_A/I Tags
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