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Vishay General Semiconductor - Diodes Division 5KASMC18AHM3/9A
- Part No.:
- 5KASMC18AHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
5KASMC18AHM3/9A.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,208
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Product details
Overview
5KASMC18AHM3/9A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for high-energy surge protection with 5000 W peak pulse power (10/1000 μs), 20.0–22.1 V breakdown voltage, and 29.2 V maximum clamping voltage at 171.2 A peak pulse current. It operates from –65 °C to +185 °C and is AEC-Q101 qualified for automotive electronics.
For engineers reviewing the 5KASMC18AHM3/9A datasheet, 5KASMC18AHM3/9A pinout, 5KASMC18AHM3/9A application, or 5KASMC18AHM3/9A equivalent, key selection criteria include unidirectional polarity, 18 V stand-off voltage, low incremental surge resistance, TJ = 185 °C capability, and MSL Level 1 reflow compatibility - critical for automotive power rail and sensor line protection.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve fast response time (<1 ns) and excellent clamping performance under repetitive surge stress. Its junction passivation enables stable operation up to 185 °C junction temperature, supporting high-reliability automotive and industrial environments where thermal derating and long-term reliability are essential.
The device is rated for 5000 W peak pulse power per 10/1000 μs waveform, with 29.2 V clamping voltage at 171.2 A IPPM and only 2.0 μA max reverse leakage at 18 V VWM (TA = 25 °C). Thermal resistance is 100 °C/W (junction-to-ambient, mounted on minimum pad layout) and 20.8 °C/W (junction-to-mount).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 12 V automotive systems. |
| VBR (min/max) | 20.0 V / 22.1 V - Breakdown voltage range at 1 mA test current; ensures consistent turn-on across production lots. |
| VC @ IPPM | 29.2 V - Clamping voltage at 171.2 A peak pulse current; limits downstream IC/MOSFET stress during transients. |
| PPPM | 5000 W - Peak pulse power handling (10/1000 μs); protects against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| TJ max | +185 °C - Maximum junction temperature; supports under-hood automotive placement without thermal derating penalties. |
| Polarity | Unidirectional - Cathode-banded configuration; suitable for DC power rail and signal line protection with defined polarity. |
| Package | DO-214AB (SMCJ) - Standardized SMT outline with 7.75 mm × 6.22 mm footprint and J-STD-020 MSL Level 1 rating. |
Pinout & Package
DO-214AB (SMCJ) package with cathode band marking on one end. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102; HM3 suffix indicates halogen-free, RoHS-compliant, AEC-Q101 qualified construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; forms clamping path when cathode is biased above VBR. |
| Cathode | High-side connection point | Marked by color band; connected to protected line (e.g., 12 V rail or sensor output); conducts surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
| 185 °C junction capability | Enables direct mounting near heat sources (e.g., engine control units) without external heatsinking or derating. |
| 5000 W peak pulse power | Withstands severe transients such as load dump (ISO 16750-2) and coupled lightning surges (IEC 61000-4-5). |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage exposure to protected devices while maintaining robust surge handling. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking or special handling requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power input and ground to shunt surge energy away from LDOs and microcontrollers. Use Value: Limits voltage excursion to ≤29.2 V during 171.2 A transients, preserving system uptime and preventing latch-up in downstream silicon. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-capacitance TVS on signal lines to absorb ESD and inductive kickback without distorting millivolt-level signals. Use Value: 2.0 μA max leakage at 18 V ensures minimal offset error; fast response prevents sensor ADC saturation during 8 kV contact ESD events. |
| Telecom DC Power Input Protection | Computer Peripheral Port Protection |
Use Scenario: Securing 48 V PoE-powered equipment inputs against induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converters and hot-swap controllers. Use Value: 5000 W rating handles multi-kA surges per IEC 61000-4-5; 185 °C rating supports compact, sealed enclosures with limited airflow. |
Use Scenario: Hardening USB, HDMI, or DisplayPort power pins against user-handling ESD and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS or auxiliary power lines to prevent damage to port controllers and level shifters. Use Value: 18 V VWM provides margin above 5 V nominal while clamping below 30 V - within absolute maximum ratings of most USB PHYs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/5A (Vishay) | Lower peak power (400 W), same DO-214AC (SMA) package, 18 V VWM, 29.2 V VC @ 13.7 A | Targeted at lower-energy transients (IEC 61000-4-2 ESD only); not suitable for ISO 7637-2 or load dump. | Select when cost and board space are prioritized over high-energy surge immunity. |
| 1.5KE18A (ON Semiconductor) | Higher power (1500 W), axial-leaded DO-201AE package, 18 V VWM, 27.7 V VC @ 54.2 A, no AEC-Q101 qualification | Requires through-hole assembly; lacks automotive qualification and high-temp reliability validation. | Choose for legacy through-hole designs or non-automotive industrial use where reflow compatibility is not required. |
Compared with SMAJ18A-E3/5A and 1.5KE18A, the 5KASMC18AHM3/9A delivers 12.5× higher peak pulse power than SMAJ18A and full AEC-Q101 compliance absent in 1.5KE18A - making it the only option qualified for under-hood automotive deployment with ISO 7637-2 immunity.
Availability
5KASMC18AHM3/9A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom DC input safeguarding, and computer peripheral port surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for 5KASMC18AHM3/9A 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, MOSFETs, and TVS devices with emphasis on reliability, power handling, and automotive qualification.
The 5KASMCxxA series is part of Vishay's PAR® (Protection Against Transients) family, engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum clamping voltage of the 5KASMC18AHM3/9A under surge conditions?
The 5KASMC18AHM3/9A has a maximum clamping voltage (VC) of 29.2 V at its rated peak pulse current (IPPM) of 171.2 A, measured using a 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures protected circuitry remains below critical overvoltage thresholds during standardized surge events like ISO 7637-2 Pulse 5a.
Is the 5KASMC18AHM3/9A suitable for automotive applications?
Yes, the 5KASMC18AHM3/9A is AEC-Q101 qualified and rated for junction temperatures up to +185 °C, making it suitable for under-hood automotive applications including engine control units, body control modules, and ADAS power supplies. Its DO-214AB package meets MSL Level 1 and supports lead-free reflow, aligning with automotive manufacturing requirements.
What does the "HM3/9A" suffix indicate in 5KASMC18AHM3/9A?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. The "/9A" indicates packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3500 units - optimized for high-volume SMT assembly lines requiring automated pick-and-place feeding.
How does the 5KASMC18AHM3/9A compare to standard SMAJ-series TVS diodes?
The 5KASMC18AHM3/9A delivers 12.5× higher peak pulse power (5000 W vs. 400 W) than SMAJ18A, uses the larger DO-214AB (SMCJ) package for improved thermal dissipation, and is qualified to AEC-Q101 - unlike most SMAJ variants. Its 185 °C junction rating also exceeds the 150 °C limit of SMAJ devices, enabling use in thermally demanding locations.
What is the reverse leakage current specification for the 5KASMC18AHM3/9A at 18 V?
At VWM = 18 V and TA = 25 °C, the 5KASMC18AHM3/9A exhibits a maximum reverse leakage current (IR) of 2.0 μA. At elevated temperature (TJ = 150 °C), leakage increases to a maximum of 50 μA - a controlled and specified parameter critical for low-power sensor and battery-backed circuits where standby current matters.
5KASMC18AHM3/9A 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- -
- 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 (SMCJ)
5KASMC18AHM3/9A FAQ
1.How can I place an order for 5KASMC18AHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for 5KASMC18AHM3/9A 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 5KASMC18AHM3/9A reliable?
The price and inventory of 5KASMC18AHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5KASMC18AHM3/9A is usually 5 days.
3.What payment methods are accepted for 5KASMC18AHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KASMC18AHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5KASMC18AHM3/9A?
5KASMC18AHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5KASMC18AHM3/9A 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 5KASMC18AHM3/9A?
For technical support, including 5KASMC18AHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KASMC18AHM3/9A requirements.
6.How does Aetrix verify that 5KASMC18AHM3/9A is sourced from the original manufacturer or authorized distributors?
All 5KASMC18AHM3/9A 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 5KASMC18AHM3/9A meets industry standards.
7.What is the process for return or replacement of 5KASMC18AHM3/9A?
All 5KASMC18AHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with 5KASMC18AHM3/9A, 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 5KASMC18AHM3/9A part is unused and in its original packaging.
Return procedure for 5KASMC18AHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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