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Vishay General Semiconductor - Diodes Division 3KASMC20AHM3_B/I
- Part No.:
- 3KASMC20AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC20AHM3_B/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,767
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Product details
Overview
3KASMC20AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 20 V stand-off voltage (VWM), and 185 °C maximum junction temperature - designed for automotive-grade overvoltage protection of MOSFETs and sensor signal lines.
For engineers reviewing the 3KASMC20AHM3_B/I datasheet, 3KASMC20AHM3_B/I pinout, 3KASMC20AHM3_B/I application, or 3KASMC20AHM3_B/I equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 77.5 °C/W), clamping behavior (VC = 32.4 V at IPPM), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to achieve stable breakdown voltage (VBR = 22.2–24.5 V at 1 mA) with low incremental surge resistance and excellent clamping ratio (VC/VBR ≈ 1.38). Its unidirectional polarity and fast response time protect against inductive switching transients without affecting DC bias paths.
Rated for TJ = –65 °C to +185 °C operation and MSL Level 1 (260 °C reflow), the device supports high-reliability automotive applications where thermal derating and long-term stability under repeated surge stress are critical - validated by 8.3 ms half-sine IFSM = 200 A surge capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC blocking range for 24 V automotive systems. |
| VBR (min/typ/max) | 22.2 / 23.4 / 24.5 V at 1 mA - Confirmed breakdown threshold ensures predictable turn-on during transients; ±5% tolerance enables robust design margin. |
| VC @ IPPM | 32.4 V at 92.6 A (10/1000 μs) - Clamping voltage limits downstream IC stress; 62% headroom above VWM ensures effective protection without false triggering. |
| PPPM | 3000 W - Peak transient energy handling capacity supports ISO 7637-2 Pulse 1/2a/5a compliance in vehicle electronics. |
| TJ max. | +185 °C - Enables placement near hot components (e.g., power converters) without thermal derating penalties in engine bay modules. |
| RθJA | 77.5 °C/W - Thermal resistance measured on minimum recommended pad layout; informs heatsinking requirements for sustained surge duty cycles. |
| AEC-Q101 | Qualified - Validated for automotive use per stress test requirements including HTGB, HTRB, and TCT; suffix HM3 denotes halogen-free, RoHS-compliant construction. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, cathode indicated by color band. Dimensions: 7.75 mm × 6.22 mm × 2.3 mm (L × W × H); UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to ground or low-impedance return path; forms reference node for clamping action. |
| Cathode | Current exit terminal during forward conduction; marked by band | Connected to protected line (e.g., CAN_H, LIN, sensor supply); absorbs surge current into ground via anode. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Reduces leakage drift over temperature and lifetime; IR ≤ 1.0 μA at VWM and ≤ 5.0 μA at TJ = 150 °C ensures signal integrity in low-power sensor interfaces. |
| 3000 W peak pulse power (10/1000 μs) | Withstands repetitive load-dump transients per ISO 16750-2 without degradation; supports >1000 surges at rated waveform. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time); critical for protecting high-speed communication lines like CAN FD. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without popcorn cracking or delamination; eliminates need for moisture preconditioning. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive OEM material declarations (e.g., GMW3032, Ford WSS-M99P9999-A1); supports end-of-life recycling compliance. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 24 V power rails in body control modules against load dump (ISO 16750-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits voltage to ≤32.4 V during 3000 W surges, preventing gate oxide damage to upstream MOSFETs and enabling reliable cold-cranking operation. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and ground to suppress ESD (IEC 61000-4-2) and inductive kickback from solenoid drivers. Use Value: Maintains signal fidelity with <1 μA leakage at 20 V, while clamping 8 kV contact ESD events within 1 ns to prevent ADC saturation or microcontroller latch-up. |
| Automotive Communication Bus Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding CAN FD transceivers in ADAS domain controllers from coupled transients on shared harnesses. IC Role / Device Role / Timing Role: TVS placed on CAN_H/CAN_L differential pair, referenced to chassis ground via low-inductance layout. Use Value: Achieves <32.4 V clamping at 92.6 A with minimal parasitic capacitance, preserving signal edge integrity up to 5 Mbps without jitter or bit errors. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances (e.g., robotic vacuum cleaners). IC Role / Device Role / Timing Role: TVS mounted across motor terminals to divert inductive energy during PWM commutation. Use Value: Handles 200 A 8.3 ms surge (IFSM) without failure, eliminating arcing at relay contacts and extending brush life in 12 V/24 V motor systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3_A/H | Same VWM (20 V), lower PPPM (400 W), SMC package, HE3 suffix (RoHS/AEC-Q101), RθJA = 85 °C/W | Lower surge rating suits non-automotive industrial controls; not qualified for extended temperature cycling per AEC-Q101. | Select when cost sensitivity outweighs 3000 W requirement and ambient temperatures remain <125 °C. |
| SMCJ20AHE3_A/H | Same VWM (20 V), PPPM = 1500 W, SMC package, HE3 suffix, RθJA = 80 °C/W, VBR = 22.2–24.5 V | Mid-tier surge capability fits infotainment power supplies; lacks 185 °C TJ rating and halogen-free certification. | Choose for consumer electronics where AEC-Q101 and halogen-free compliance are not mandated. |
Compared with SMAJ20AHE3_A/H and SMCJ20AHE3_A/H, the 3KASMC20AHM3_B/I delivers 2× and 2× higher peak pulse power respectively, full AEC-Q101 validation, 185 °C operation, and halogen-free construction - making it the only option qualified for under-hood automotive modules requiring long-term reliability at elevated temperatures.
Availability
3KASMC20AHM3_B/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor signal protection, automotive communication bus protection, and consumer appliance motor drive protection requiring stable component supply across production lifecycles.
Supply support for 3KASMC20AHM3_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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMC series is part of Vishay's PAR® (Protective Avalanche Rectifier) platform, engineered specifically for robust transient suppression in harsh environments such as automotive engine compartments and industrial motor drives.
FAQ
What is the clamping voltage of the 3KASMC20AHM3_B/I at its rated peak pulse current?
The 3KASMC20AHM3_B/I has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current (IPPM) of 92.6 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and ensures downstream circuitry remains below destructive voltage thresholds during surge events. The 3KASMC20AHM3_B/I maintains this clamping performance across its full operating temperature range.
Is the 3KASMC20AHM3_B/I qualified to AEC-Q101 standards?
Yes, the 3KASMC20AHM3_B/I is fully AEC-Q101 qualified, as confirmed by Vishay's documentation (Document Number: 88480, Revision: 19-Jan-2024). The HM3 suffix explicitly denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. Qualification includes stress tests such as high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT).
What does the "HM3" suffix mean in 3KASMC20AHM3_B/I?
The "HM3" suffix in 3KASMC20AHM3_B/I indicates halogen-free, RoHS-compliant construction that meets JESD201 Class 2 whisker resistance requirements. It distinguishes this variant from HE3 (RoHS-compliant but not halogen-free) and confirms compliance with automotive material restrictions including GMW3032 and Ford WSS-M99P9999-A1. The "B/I" denotes revision B in 13-inch tape-and-reel packaging (3500 units per reel).
Can the 3KASMC20AHM3_B/I be used in bidirectional configurations?
No, the 3KASMC20AHM3_B/I is unidirectional only, as stated in the Vishay datasheet. It conducts in reverse bias during overvoltage events and blocks forward current up to VF = 3.5 V at 100 A. For bidirectional protection (e.g., AC lines or differential buses), a separate device such as the SMBJ20CAHE3_A/H or dual-diode array would be required - the 3KASMC20AHM3_B/I must not be substituted without circuit redesign.
What is the thermal resistance junction-to-ambient (RθJA) for the 3KASMC20AHM3_B/I?
The 3KASMC20AHM3_B/I has a typical thermal resistance junction-to-ambient (RθJA) of 77.5 °C/W when mounted on the minimum recommended pad layout per the Vishay datasheet. This value assumes no additional heatsinking and is critical for calculating junction temperature rise under sustained power dissipation (PD = 6.0 W) or repeated surge conditions. Layout optimization can reduce effective RθJA by up to 30%.
3KASMC20AHM3_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):
- 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)
3KASMC20AHM3_B/I FAQ
1.How can I place an order for 3KASMC20AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC20AHM3_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 3KASMC20AHM3_B/I reliable?
The price and inventory of 3KASMC20AHM3_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 3KASMC20AHM3_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC20AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC20AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC20AHM3_B/I?
3KASMC20AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC20AHM3_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 3KASMC20AHM3_B/I?
For technical support, including 3KASMC20AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC20AHM3_B/I requirements.
6.How does Aetrix verify that 3KASMC20AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC20AHM3_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 3KASMC20AHM3_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC20AHM3_B/I?
All 3KASMC20AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC20AHM3_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 3KASMC20AHM3_B/I part is unused and in its original packaging.
Return procedure for 3KASMC20AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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