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Vishay General Semiconductor - Diodes Division 5KASMC20AHM3_A/I
- Part No.:
- 5KASMC20AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
5KASMC20AHM3_A/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,414
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Product details
Overview
5KASMC20AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for high-energy surge clamping in automotive and industrial power rails. It delivers 5000 W peak pulse power (10/1000 µs), clamps at 32.4 V under 154.3 A surge current, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and sensor signal lines in engine control units and battery management systems.
For engineers reviewing the 5KASMC20AHM3_A/I datasheet, 5KASMC20AHM3_A/I pinout, 5KASMC20AHM3_A/I application, or 5KASMC20AHM3_A/I equivalent, key selection criteria include its 20 V stand-off voltage, 22.2–24.5 V breakdown range at 1 mA, AEC-Q101 qualification, SMC (DO-214AB) package, and 0.085 %/°C temperature coefficient of VBR.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping performance across -65 °C to +185 °C operating range. Its low incremental surge resistance and fast response time ensure effective suppression of inductive switching transients and ESD events on 12 V and 24 V DC systems.
The device is rated for 5000 W peak pulse power with 10/1000 µs waveform and exhibits 32.4 V maximum clamping voltage at 154.3 A IPPM. Thermal resistance is 100 °C/W (junction-to-ambient) and 20.8 °C/W (junction-to-mount), supporting reliable operation on standard PCB pad layouts without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse working voltage before leakage exceeds 2 µA; sets upper limit for protected circuit's normal operating voltage. |
| VBR (min/typ/max) | 22.2 / 23.4 / 24.5 V at 1 mA - ensures reliable turn-on during overvoltage events while avoiding false triggering during ripple or noise. |
| VC @ IPPM | 32.4 V at 154.3 A - clamping voltage under full 5000 W surge; determines maximum stress imposed on downstream ICs or MOSFETs. |
| PPPM | 5000 W (10/1000 µs) - defines energy-handling capability for automotive load-dump and ISO 7637-2 pulse 5a events. |
| TJ max | +185 °C - enables use in under-hood automotive environments and high-temperature industrial enclosures without derating. |
| AEC-Q101 | Qualified - confirms reliability for automotive electronics per stress test requirements including HTGB, HTRB, and TCT. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and cathode band marking. |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case meeting UL 94 V-0; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102; cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; forms current path during reverse-biased clamping event. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); reverse voltage applied between cathode and anode triggers avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure improves long-term stability and reduces parameter drift under thermal cycling. |
| MSL Level 1 | Rated for reflow up to 260 °C peak, eliminating moisture sensitivity concerns during standard SMT assembly. |
| Halogen-free & RoHS | HM3 suffix indicates compliance with environmental standards and whisker resistance per JESD 201 Class 2. |
| Low clamping ratio | VC/VBR ≈ 1.38 - tight ratio minimizes overvoltage margin required for protected components' absolute maximum ratings. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial 24 V PLC Input Module |
|---|---|
Use Scenario: Protection of microcontroller I/O and CAN transceiver power rails against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V supply and ground to clamp surges above 20 V. Use Value: Withstands 5000 W pulses and operates up to 185 °C, ensuring reliability in under-hood ECU environments per ISO 7637-2. |
Use Scenario: Safeguarding digital input optocouplers and level-shifting circuits from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V DC input stage to prevent latch-up or damage during lightning-induced transients. Use Value: 32.4 V clamping voltage limits stress on 3.3 V/5 V logic interfaces via series impedance, maintaining signal integrity. |
| Automotive Battery Management System (BMS) | Telecom Power Supply Front-End |
Use Scenario: Overvoltage protection on cell monitor IC supply lines exposed to pack-level transients during contactor switching. IC Role / Device Role / Timing Role: Localized TVS adjacent to analog front-end inputs to suppress fast-rising spikes (<1 ns rise time). Use Value: Fast response time and low dynamic impedance ensure clamping occurs before sensitive ADCs or reference circuits are overstressed. |
Use Scenario: Secondary-side surge suppression on 48 V telecom rectifier outputs feeding PoE controllers and Ethernet PHYs. IC Role / Device Role / Timing Role: Unidirectional clamping device on DC output rail to meet IEC 61000-4-5 Level 3 immunity requirements. Use Value: AEC-Q101 qualification provides extended lifetime confidence in 24/7 powered infrastructure equipment. |
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 | Lower PPPM (600 W), smaller SMB package, 34.2 V clamping at 17.5 A IPPM | Not suitable for load-dump events; limited to ESD and low-energy transients | Select when space-constrained and surge energy <100 mJ; verify thermal design for repeated events. |
| 5.0SMDJ20A | Same 20 V VWM, higher 5000 W rating, but larger SMC-like package (DO-214AB equivalent), 32.4 V VC | Identical clamping performance but different mechanical footprint and tape/reel packaging | Use if existing layout accommodates DO-214AB and sourcing flexibility is needed; verify reel size compatibility (I vs. H code). |
Compared with SMBJ20A and 5.0SMDJ20A, the 5KASMC20AHM3_A/I offers identical clamping voltage and surge rating as the latter but with AEC-Q101 qualification and HM3 halogen-free/RoHS compliance built-in - making it the preferred choice for automotive-grade production where qualification traceability and material compliance are mandatory.
Availability
5KASMC20AHM3_A/I is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and battery management systems requiring stable component supply with full AEC-Q101 documentation and traceable lot history.
Supply support for 5KASMC20AHM3_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, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 5KASMCxxA family is engineered specifically for high-temperature, high-surge automotive power rail protection - delivering AEC-Q101 qualified TVS performance in the rugged SMC package with optimized thermal and electrical characteristics.
FAQ
What is the maximum clamping voltage of the 5KASMC20AHM3_A/I under full-rated surge current?
The 5KASMC20AHM3_A/I has a maximum clamping voltage (VC) of 32.4 V when subjected to its peak pulse current (IPPM) of 154.3 A using the 10/1000 µs waveform. This value is measured per Figure 1 in the official Vishay datasheet (Document Number: 89432) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Is the 5KASMC20AHM3_A/I qualified for automotive applications?
Yes, the 5KASMC20AHM3_A/I is AEC-Q101 qualified, confirming its suitability for automotive electronics. The qualification covers stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT), ensuring reliability in under-hood and powertrain environments where junction temperatures reach 185 °C.
What does the "HM3_A/I" suffix indicate in 5KASMC20AHM3_A/I?
The "HM3" denotes halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance; "A" is the revision code; "I" specifies packaging in 13-inch tape-and-reel format with 3500 units per reel. This distinguishes it from the "H" variant (7-inch reel, 850 units), both sharing identical electrical and thermal specifications.
Can the 5KASMC20AHM3_A/I be used in bidirectional configurations?
No, the 5KASMC20AHM3_A/I is unidirectional only, as explicitly stated in the Vishay datasheet. It conducts only when reverse-biased beyond its breakdown voltage. For bidirectional protection, two devices must be connected in series opposing configuration, or a dedicated bidirectional TVS such as SMAJ20CA should be selected instead.
What is the thermal resistance of the 5KASMC20AHM3_A/I, and how does it affect PCB layout?
The 5KASMC20AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-mount (RθJM) of 20.8 °C/W. To maintain safe operation below 185 °C junction temperature, PCB copper area under the SMC pad must follow Vishay's minimum recommended layout - insufficient copper increases RθJA and risks thermal runaway during repetitive surges.
5KASMC20AHM3_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:
- 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):
- 154.3A
- Power - Peak Pulse:
- 5000W (5kW)
- 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)
5KASMC20AHM3_A/I FAQ
1.How can I place an order for 5KASMC20AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 5KASMC20AHM3_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 5KASMC20AHM3_A/I reliable?
The price and inventory of 5KASMC20AHM3_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 5KASMC20AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 5KASMC20AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KASMC20AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5KASMC20AHM3_A/I?
5KASMC20AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5KASMC20AHM3_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 5KASMC20AHM3_A/I?
For technical support, including 5KASMC20AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KASMC20AHM3_A/I requirements.
6.How does Aetrix verify that 5KASMC20AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 5KASMC20AHM3_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 5KASMC20AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 5KASMC20AHM3_A/I?
All 5KASMC20AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 5KASMC20AHM3_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 5KASMC20AHM3_A/I part is unused and in its original packaging.
Return procedure for 5KASMC20AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
5KASMC20AHM3_A/I Tags
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