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Vishay General Semiconductor - Diodes Division 3KASMC18AHM3_A/I
- Part No.:
- 3KASMC18AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18AHM3_A/I.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,081
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Product details
Overview
3KASMC18AHM3_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 3000 W peak pulse power (10/1000 μs), clamps at 29.2 V under 103 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 3KASMC18AHM3_A/I datasheet, 3KASMC18AHM3_A/I pinout, 3KASMC18AHM3_A/I application, or 3KASMC18AHM3_A/I equivalent, key selection criteria include its 18 V stand-off voltage, AEC-Q101 qualification, DO-214AB (SMC) package thermal performance, and uni-directional polarity compatibility with DC bus protection architectures.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its 18.9–20.9 V breakdown range (at 1 mA) and 29.2 V clamping voltage at 103 A ensure precise overvoltage limiting without false triggering during normal operation.
Rated for 200 A non-repetitive forward surge current (8.3 ms half-sine), it supports high-energy transients from inductive load switching. The device meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing - confirming reliability under reflow and long-term mechanical stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 18 V - maximum continuous reverse voltage before clamping begins; sets operating margin for 12 V automotive systems. |
| Breakdown Voltage (VBR) | 20.0–22.1 V at 1 mA - defines onset of avalanche conduction; ensures reliable turn-on above normal rail fluctuations. |
| Clamping Voltage (VC) | 29.2 V at 103 A - limits peak transient voltage seen by downstream ICs; critical for protecting 30 V-rated MOSFETs. |
| Peak Pulse Power (PPPM) | 3000 W (10/1000 μs) - sustains high-energy surges typical of ISO 7637-2 Pulse 1/2a/5a in vehicle electronics. |
| Junction Temperature (TJ) | −65 to +185 °C - enables under-hood deployment without derating in engine control modules. |
| Thermal Resistance (RθJA) | 77.5 °C/W - determines self-heating under sustained leakage; requires minimum pad layout per datasheet fig. 4. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HTOL, TCT, and ESD testing per AEC specification. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by color band. Meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; carries full surge current during clamping. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); reverse-biased during normal operation; avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process reduces leakage drift and improves long-term stability at 150 °C. |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak, simplifying SMT assembly. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., load dump), improving system immunity. |
| Uni-directional polarity | Enables integration into DC-coupled power rails without blocking forward conduction paths. |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling, ensuring reliability in automotive under-hood environments. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Supply |
|---|---|
Use Scenario: Protects microcontroller I/O and gate drivers from load-dump transients during alternator regulation faults. IC Role / Device Role / Timing Role: Uni-directional TVS placed between 12 V rail and chassis ground to clamp surges up to 3000 W. Use Value: Maintains 29.2 V clamping ceiling below MOSFET drain-source breakdown, preventing catastrophic failure during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shields PLC input circuitry from inductive kickback when solenoids or contactors de-energize. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V DC control bus, absorbing repetitive 10/1000 μs surges up to 103 A. Use Value: Delivers stable 18 V hold-off with <1 μA leakage at 25 °C, minimizing standby power loss while enabling fast response (<1 ns). |
| Automotive Battery Management System (BMS) | Telecom Power Interface Protection |
Use Scenario: Safeguards cell monitoring ICs and isolation amplifiers against voltage spikes during high-current charge/discharge transitions. IC Role / Device Role / Timing Role: Clamping diode on isolated CAN or analog sensing lines referenced to battery ground. Use Value: Operates reliably at 185 °C junction temperature, supporting compact placement near hot battery cells without thermal derating. |
Use Scenario: Guards Ethernet PHY power pins and RS-485 transceivers from lightning-induced surges on outdoor telecom cabinets. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input, coordinated with secondary GDT or MOV stages. Use Value: Provides 3000 W surge handling with 77.5 °C/W RθJA, enabling effective heat dissipation on standard FR4 PCBs without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T (Vishay) | Lower PPPM (400 W), same DO-214AC (SMA) package, 18 V VWM, but only rated to 150 °C TJ max. | Not AEC-Q101 qualified; suitable for commercial-grade consumer or telecom, not automotive under-hood use. | Select when cost sensitivity outweighs automotive qualification and surge energy requirements. |
| 1.5KE18A (ON Semiconductor) | Higher power (1500 W), axial-leaded DO-201AE package, 18 V VWM, but no AEC-Q101 or MSL Level 1 rating. | Requires through-hole assembly and manual rework; incompatible with automated SMT lines and high-reliability thermal cycling. | Choose only for legacy board redesigns where SMT footprint change is prohibited and AEC compliance is not required. |
Compared with SMAJ18A-E3/57T and 1.5KE18A, the 3KASMC18AHM3_A/I provides triple the peak pulse power, automotive-grade qualification, and surface-mount scalability - making it the sole option for new AEC-compliant designs requiring >1 kW surge handling in SMC footprint.
Availability
3KASMC18AHM3_A/I is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, battery management systems, and telecom power interfaces requiring stable component supply across extended temperature and high-reliability environments.
Supply support for 3KASMC18AHM3_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 diodes, rectifiers, and protection devices with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMC series was engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive and industrial power systems - prioritizing thermal robustness, surge endurance, and SMT manufacturability.
FAQ
What is the clamping voltage of the 3KASMC18AHM3_A/I at its rated peak pulse current?
The 3KASMC18AHM3_A/I has a maximum clamping voltage (VC) of 29.2 V at 103 A peak pulse current (IPPM), measured using a 10/1000 μs waveform. This value is guaranteed per the Vishay datasheet (Document Number: 89962, page 2) and defines the upper voltage limit imposed on protected circuits during surge events. Designers must verify that this clamping level remains below the absolute maximum ratings of downstream components such as MOSFETs or interface ICs.
Is the 3KASMC18AHM3_A/I qualified for automotive applications?
Yes, the 3KASMC18AHM3_A/I is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (page 1, FEATURES section and page 2, Notes section). This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TCT), and electrostatic discharge (ESD), confirming suitability for automotive powertrain and body electronics. The "HM3" suffix further denotes RoHS compliance and whisker resistance per JESD201 Class 2.
What does the "_A/I" suffix mean in 3KASMC18AHM3_A/I?
The "_A/I" suffix in 3KASMC18AHM3_A/I indicates the packaging configuration: "I" specifies 13-inch diameter plastic tape and reel with a base quantity of 3500 units, per Vishay's ordering information table (page 2 of Document Number 89962). The "A" denotes revision level, and "HM3" confirms the RoHS-compliant, AEC-Q101-qualified DO-214AB (SMC) package variant.
Can the 3KASMC18AHM3_A/I be used in bidirectional configurations?
No, the 3KASMC18AHM3_A/I is strictly unidirectional, as confirmed in the FEATURES section of the Vishay datasheet (page 1): "Available in uni-directional polarity only." It functions as a reverse-biased avalanche diode and cannot suppress positive-going transients on grounded lines or negative excursions on floating nodes. For bidirectional protection, a separate symmetrical TVS array or back-to-back configuration would be required.
What is the thermal resistance from junction to ambient for the 3KASMC18AHM3_A/I?
The typical thermal resistance from junction to ambient (RθJA) for the 3KASMC18AHM3_A/I is 77.5 °C/W, measured under standard conditions with the minimum recommended pad layout (Vishay Document Number 89962, page 2, THERMAL CHARACTERISTICS table). This value assumes no external heatsinking and must be applied with derating curves (fig. 6) when ambient temperatures exceed 25 °C or power dissipation approaches 6.0 W.
3KASMC18AHM3_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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 93.2A
- 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 (SMCJ)
3KASMC18AHM3_A/I FAQ
1.How can I place an order for 3KASMC18AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18AHM3_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 3KASMC18AHM3_A/I reliable?
The price and inventory of 3KASMC18AHM3_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 3KASMC18AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC18AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18AHM3_A/I?
3KASMC18AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18AHM3_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 3KASMC18AHM3_A/I?
For technical support, including 3KASMC18AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18AHM3_A/I requirements.
6.How does Aetrix verify that 3KASMC18AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC18AHM3_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 3KASMC18AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC18AHM3_A/I?
All 3KASMC18AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18AHM3_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 3KASMC18AHM3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC18AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC18AHM3_A/I Tags
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