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Vishay General Semiconductor - Diodes Division 5KASMC18AHM3_A/H
- Part No.:
- 5KASMC18AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
5KASMC18AHM3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,295
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Product details
Overview
5KASMC18AHM3_A/H 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 ≤29.2 V under 171.2 A surge current, and operates up to +185 °C junction temperature. Used to protect MOSFETs and sensor signal lines against inductive switching transients.
For engineers reviewing the 5KASMC18AHM3_A/H datasheet, 5KASMC18AHM3_A/H pinout, 5KASMC18AHM3_A/H application, or 5KASMC18AHM3_A/H equivalent, key selection criteria include its 18 V stand-off voltage, 20.0–22.1 V breakdown range at 1 mA, AEC-Q101 qualification, SMC (DO-214AB) package, and 2.0 μA max reverse leakage at VWM.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for junction stability under thermal stress. Its unidirectional architecture enables robust clamping during positive-going transients on DC power lines while maintaining low incremental surge resistance and fast response time.
Rated for 185 °C maximum junction temperature and qualified to AEC-Q101, it supports automotive under-hood applications where reliability under high ambient temperature and repetitive surge exposure is critical. The device meets MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/typ/max) | 20.0 / 21.1 / 22.1 V at 1 mA - Ensures reliable turn-on above system nominal voltage with margin |
| VC @ IPPM | 29.2 V at 171.2 A - Clamping voltage limits downstream component stress during 5000 W surge events |
| PPPM | 5000 W (10/1000 μs) - Handles high-energy transients common in automotive load-dump and inductive switch-off |
| TJ max | +185 °C - Enables placement near hot components (e.g., power converters, engine control units) |
| Leakage @ VWM | ≤2.0 μA at 25 °C - Minimizes standby power loss in battery-sensitive systems |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronic components |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for unidirectional clamping | Connected to ground or low-side return path; defines polarity of transient suppression |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 12 V rail); conducts surge current to ground when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure improves long-term stability under thermal cycling and humidity |
| High-temperature operation | Rated for continuous operation up to +185 °C junction temperature, supporting under-hood deployment |
| Peak pulse power | 5000 W capability enables protection against ISO 7637-2 Pulse 5a (load dump) without derating |
| Low clamping ratio | VC/VBR ≈ 1.38 ensures minimal overvoltage overshoot during surge events |
| MSL Level 1 | Compatible with standard SMT reflow profiles up to 260 °C peak, eliminating moisture sensitivity handling |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive I/O Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp positive surges before they reach LDOs or microcontrollers. Use Value: Withstands 5000 W pulses and operates reliably at +185 °C, enabling direct placement near power entry points in engine control modules. | Use Scenario: Shielding digital I/O lines of PLC output cards from inductive kickback generated by solenoid or relay coils. IC Role / Device Role / Timing Role: Fast-response TVS connected across coil terminals or at driver IC outputs to absorb stored magnetic energy. Use Value: 29.2 V clamping voltage prevents latch-up in 24 V logic interfaces; AEC-Q101 qualification adds confidence in harsh factory environments. |
| Automotive Sensor Signal Line Protection | Telecom DC Power Input Protection |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in ADAS modules from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤2.0 μA) TVS placed at connector interface to shunt transients before signal conditioning circuitry. Use Value: Minimal reverse leakage preserves signal integrity in high-impedance sensor paths; SMC package allows compact layout near connectors. | Use Scenario: Protecting 48 V DC inputs of telecom base station power supplies from lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level TVS on main DC input bus, coordinated with upstream MOVs and downstream filtering. Use Value: 5000 W rating handles combination wave (10/700 μs) surges; thermal robustness ensures sustained performance during repeated events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Lower peak pulse power (400 W), same SMC package, VBR = 20.0–22.2 V | Not AEC-Q101 qualified; limited to consumer/industrial use, not automotive | Select only if surge energy is <10% of 5KASMC18AHM3_A/H capability and automotive qualification is unnecessary |
| SMCJ18A | Same 5000 W rating and AEC-Q101 qualification, but higher VC = 32.4 V at 154.3 A | Higher clamping voltage increases stress on downstream devices in low-voltage systems | Preferable only when board layout requires identical footprint and higher clamping margin is acceptable |
Compared with SMAJ18A and SMCJ18A, the 5KASMC18AHM3_A/H offers the optimal balance of automotive qualification, low clamping voltage (29.2 V), and full 5000 W surge capacity-making it the preferred choice for space-constrained, high-reliability 12 V/24 V power rail protection.
Availability
5KASMC18AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial motor drive protection, and telecom DC power input hardening requiring stable component supply and long-term lifecycle support.
Supply support for 5KASMC18AHM3_A/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 and high-temperature performance.
The 5KASMCxxA family was engineered specifically for automotive-grade transient suppression, combining PAR® technology, AEC-Q101 compliance, and extended junction temperature capability to meet stringent under-hood requirements.
FAQ
What is the breakdown voltage tolerance of the 5KASMC18AHM3_A/H?
The 5KASMC18AHM3_A/H has a specified breakdown voltage range of 20.0 V (min) to 22.1 V (max) at 1 mA test current, with a typical value of 21.1 V. This ±5.2% tolerance ensures consistent turn-on behavior across production lots while allowing margin for system voltage variations and temperature drift. The device's temperature coefficient of 0.083 %/°C further defines how VBR shifts with junction temperature.
Is the 5KASMC18AHM3_A/H suitable for bidirectional transient protection?
No, the 5KASMC18AHM3_A/H is unidirectional only, as explicitly stated in the Vishay datasheet. It protects against positive-going transients on the cathode side relative to anode (ground). For bidirectional protection-such as AC lines or data lines subject to ±ESD-the 5KASMC18AHM3_A/H must be paired with another diode or replaced with a dedicated bidirectional TVS like the SMBJ18CA.
What does the "HM3_A/H" suffix indicate in 5KASMC18AHM3_A/H?
The "HM3" denotes the halogen-free, RoHS-compliant, AEC-Q101-qualified SMC package with matte tin plating and JESD201 Class 2 whisker resistance. "A/H" specifies the revision code ("A") and tape-and-reel delivery mode: 7-inch diameter reel with 850 units per reel. This matches the ordering information table in Document Number 89432.
How does the thermal resistance of the 5KASMC18AHM3_A/H affect PCB layout?
The 5KASMC18AHM3_A/H has RθJA = 100 °C/W (on minimum pad) and RθJM = 20.8 °C/W (to mount), meaning effective heat dissipation depends heavily on copper area and thermal vias. To sustain 6.5 W continuous power or manage surge self-heating, designers must use ≥100 mm² of 2-oz copper connected via ≥4 thermal vias under the cathode/anode pads per Vishay's recommended layout.
Can the 5KASMC18AHM3_A/H replace the older 5KASMC18A without layout changes?
Yes-the 5KASMC18AHM3_A/H uses the identical SMC (DO-214AB) package and pinout as the base 5KASMC18A, with no mechanical or electrical differences affecting PCB fit. The HM3 suffix adds halogen-free, RoHS, and AEC-Q101 compliance but retains full functional equivalence, making it a drop-in replacement for new designs and legacy refreshes.
5KASMC18AHM3_A/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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 171.2A
- 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)
5KASMC18AHM3_A/H FAQ
1.How can I place an order for 5KASMC18AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 5KASMC18AHM3_A/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 5KASMC18AHM3_A/H reliable?
The price and inventory of 5KASMC18AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5KASMC18AHM3_A/H is usually 5 days.
3.What payment methods are accepted for 5KASMC18AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KASMC18AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5KASMC18AHM3_A/H?
5KASMC18AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5KASMC18AHM3_A/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 5KASMC18AHM3_A/H?
For technical support, including 5KASMC18AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KASMC18AHM3_A/H requirements.
6.How does Aetrix verify that 5KASMC18AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All 5KASMC18AHM3_A/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 5KASMC18AHM3_A/H meets industry standards.
7.What is the process for return or replacement of 5KASMC18AHM3_A/H?
All 5KASMC18AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 5KASMC18AHM3_A/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 5KASMC18AHM3_A/H part is unused and in its original packaging.
Return procedure for 5KASMC18AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
5KASMC18AHM3_A/H Tags
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