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Vishay General Semiconductor - Diodes Division 3KASMC20AHM3_B/H
- Part No.:
- 3KASMC20AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC20AHM3_B/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,700
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Product details
Overview
3KASMC20AHM3_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 (VWM), 22.2–24.5 V breakdown (VBR), 3000 W peak pulse power (10/1000 μs), 185 °C max junction temperature, and 92.6 A peak pulse current - designed for automotive-grade overvoltage protection of power rails and signal lines in engine control units.
For engineers reviewing the 3KASMC20AHM3_B/H datasheet, 3KASMC20AHM3_B/H pinout, 3KASMC20AHM3_B/H application, or 3KASMC20AHM3_B/H equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS compliance, 185 °C thermal capability, low clamping voltage (32.4 V at IPPM), and MSL Level 1 rating for high-reliability reflow assembly.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology with junction passivation optimized for stable clamping under repetitive surge stress. Its unidirectional polarity and 10/1000 μs waveform response enable precise overvoltage suppression on DC power inputs and low-side switching nodes.
Thermal design is supported by RθJL = 18.3 °C/W (junction-to-leads) and RθJA = 77.5 °C/W (junction-to-ambient), enabling reliable operation up to TJ = 185 °C when mounted per recommended pad layout. The device meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V automotive systems. |
| VBR (min/typ/max) | 22.2 / 23.4 / 24.5 V at IT = 1 mA - tight 5% tolerance ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 32.4 V at 92.6 A - clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 1/2a/5a transients. |
| PPPM | 3000 W (10/1000 μs) - sustains high-energy surges common in alternator load dump and inductive switch-off events. |
| TJ max | 185 °C - enables placement near hot components (e.g., power MOSFETs, DC-DC inductors) without derating loss. |
| Polarity | Unidirectional - protects only against positive-going transients on cathode-grounded configurations. |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 7.11 mm x 6.60 mm body and 3.20 mm min. cathode band width. |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case meeting UL 94 V-0; matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode denoted by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts transient energy to ground when VLINE exceeds VBR. |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including engine control, transmission, and ADAS modules. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets IEC 61249-2-21 and JEDEC JS709C requirements for green electronics manufacturing. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow without moisture-induced popcorn failure or delamination. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD, relay bounce) due to low dynamic impedance. |
| Junction passivation optimized design | Reduces parameter drift and leakage growth after repeated surge exposure, extending field life in harsh environments. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protects 24 V supply rail of microcontroller and CAN transceiver from load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping device on main power input, placed upstream of DC-DC converter. Use Value: Limits transient voltage to ≤32.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and 12 V analog circuitry. |
Use Scenario: Shields 24 V digital input channel from inductive kickback when interfacing with solenoids and contactors. IC Role / Device Role / Timing Role: Front-end surge limiter on optocoupler input side, absorbing >1 kV spikes per IEC 61000-4-4. Use Value: Enables robust 20 ms surge immunity at 3000 W without requiring external series impedance or active crowbar circuits. |
| Telecom Power Supply Board | Automotive ADAS Camera Module |
Use Scenario: Guards primary-side 48 V DC-DC converter input against lightning-induced surges on PoE or central plant feeds. IC Role / Device Role / Timing Role: First-line transient suppressor on bulk capacitor input, coordinated with MOV and fuse. Use Value: Clamps 10/1000 μs surges to 32.4 V within <1 ns, preserving upstream rectifier and transformer insulation integrity. |
Use Scenario: Safeguards 12 V camera power input from battery transients during cold-crank and jump-start conditions. IC Role / Device Role / Timing Role: Unidirectional TVS on power rail adjacent to image sensor and ISP ASIC. Use Value: Maintains operation down to -40 °C and up to +125 °C ambient while delivering full 3000 W surge capacity at TJ = 150 °C. |
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), smaller SMA package (DO-214AC), non-AEC-Q101, no halogen-free option. | Limited to consumer/industrial use; insufficient for automotive load dump or ISO 7637-2 Pulse 5a. | Select when cost-sensitive, low-surge environments require compact footprint and AEC-Q101 is not mandated. |
| SMCJ20AHE3_A/H | Same VWM (20 V), identical PPPM (3000 W), same SMC package, AEC-Q101 qualified, but HE3 (not HM3) - RoHS-compliant but not halogen-free. | Matches 3KASMC20AHM3_B/H performance and automotive qualification, but lacks halogen-free certification. | Choose when halogen-free compliance is not required and existing HE3 logistics streamline procurement. |
Compared with SMAJ20AHE3_A/H and SMCJ20AHE3_A/H, the 3KASMC20AHM3_B/H uniquely combines AEC-Q101 qualification, halogen-free construction, and 185 °C junction rating - making it the only option certified for extended-life underhood deployment where both material compliance and thermal resilience are mandatory.
Availability
3KASMC20AHM3_B/H is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC input protection, telecom power supplies, and ADAS camera modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 3KASMC20AHM3_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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, thermal performance, and automotive qualification.
The 3KASMCxxA family is engineered for high-temperature, high-reliability transient suppression in automotive and industrial power systems - specifically targeting AEC-Q101 compliance, 185 °C operation, and robust 10/1000 μs surge handling.
FAQ
What is the clamping voltage of the 3KASMC20AHM3_B/H under maximum surge conditions?
The 3KASMC20AHM3_B/H has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 92.6 A using a 10/1000 μs waveform. This value is measured per Fig. 1 and Table 1 in Vishay Document 88480 and reflects worst-case clamping performance at TA = 25 °C. The 3KASMC20AHM3_B/H maintains this clamping behavior across its full operating temperature range due to its low VBR temperature coefficient (0.085 %/°C).
Is the 3KASMC20AHM3_B/H qualified for automotive applications?
Yes, the 3KASMC20AHM3_B/H is AEC-Q101 qualified, as confirmed in the Mechanical Data section and Ordering Information table of Vishay Document 88480. Its HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction - making the 3KASMC20AHM3_B/H suitable for underhood and safety-critical automotive systems including engine control, transmission, and ADAS modules.
What does the "HM3" suffix mean in 3KASMC20AHM3_B/H?
The "HM3" suffix in 3KASMC20AHM3_B/H indicates halogen-free, RoHS-compliant, and AEC-Q101-qualified construction per Vishay's material categorization standard (Document 99912). It distinguishes the part from HE3 variants (RoHS-compliant but not halogen-free) and confirms compliance with JEDEC JS709C and IEC 61249-2-21. The 3KASMC20AHM3_B/H also passes JESD201 Class 2 whisker testing.
What is the thermal resistance of the 3KASMC20AHM3_B/H, and how does it affect PCB layout?
The 3KASMC20AHM3_B/H has RθJL = 18.3 °C/W (junction-to-leads) and RθJA = 77.5 °C/W (junction-to-ambient). These values assume mounting per the recommended pad layout in Document 88480 - 0.126" (3.20 mm) minimum cathode pad width and 0.185" (4.69 mm) max overall length. Deviating from this layout increases thermal resistance, reducing the 3KASMC20AHM3_B/H's ability to sustain 3000 W surges at elevated ambient temperatures.
Can the 3KASMC20AHM3_B/H replace the 3KASMC20AHE3_B/H in an existing design?
Yes, the 3KASMC20AHM3_B/H is a direct replacement for 3KASMC20AHE3_B/H in terms of electrical specs, package (SMC), pinout, and AEC-Q101 qualification - with the added benefit of halogen-free construction. Both share identical VWM (20 V), VBR (22.2–24.5 V), VC (32.4 V), and PPPM (3000 W). No PCB changes are needed; the 3KASMC20AHM3_B/H uses the same tape-and-reel packaging (H code, 850 units/reel).
3KASMC20AHM3_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)
3KASMC20AHM3_B/H FAQ
1.How can I place an order for 3KASMC20AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC20AHM3_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 3KASMC20AHM3_B/H reliable?
The price and inventory of 3KASMC20AHM3_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 3KASMC20AHM3_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC20AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC20AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC20AHM3_B/H?
3KASMC20AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC20AHM3_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 3KASMC20AHM3_B/H?
For technical support, including 3KASMC20AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC20AHM3_B/H requirements.
6.How does Aetrix verify that 3KASMC20AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC20AHM3_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 3KASMC20AHM3_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC20AHM3_B/H?
All 3KASMC20AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC20AHM3_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 3KASMC20AHM3_B/H part is unused and in its original packaging.
Return procedure for 3KASMC20AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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