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Vishay General Semiconductor - Diodes Division 3KASMC18AHE3_A/I
- Part No.:
- 3KASMC18AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18AHE3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,717
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Product details
Overview
3KASMC18AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 18 V stand-off voltage, 20.0–22.1 V breakdown at 1 mA, 3000 W peak pulse power (10/1000 μs), 103 A peak surge current, and 29.2 V clamping voltage at IPPM - deployed for automotive power line and sensor signal line protection.
For engineers reviewing the 3KASMC18AHE3_A/I datasheet, 3KASMC18AHE3_A/I pinout, 3KASMC18AHE3_A/I application, or 3KASMC18AHE3_A/I equivalent, key selection criteria include AEC-Q101 qualification, TJ = 185 °C operation, MSL Level 1 moisture sensitivity, uni-directional polarity, and DO-214AB thermal performance under high-reliability automotive transients.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve low incremental surge resistance and fast response time under ESD and lightning-induced transients. Its junction passivation enables stable operation up to 185 °C junction temperature, meeting stringent automotive reliability requirements.
The device operates exclusively in uni-directional mode with cathode band marking, delivers 29.2 V clamping at 103 A (10/1000 μs), and maintains ≤1.0 μA reverse leakage at 18 V and 25 °C - critical for low-power sensor interface protection without signal distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - verified breakdown threshold ensures predictable turn-on during overvoltage events |
| VC @ IPPM | 29.2 V at 103 A - clamping voltage limits downstream IC stress during 3000 W transient surges |
| PPPM | 3000 W (10/1000 μs) - peak pulse power rating validated for automotive load-dump and inductive switching immunity |
| TJ max. | 185 °C - extended junction temperature capability supports under-hood and high-ambient industrial environments |
| Polarity | Uni-directional - requires correct orientation in series with positive supply rail or signal path |
| MSL Level | Level 1 (J-STD-020) - no floor life limitation; compatible with standard SMT reflow up to 260 °C peak |
Pinout & Package
Package: DO-214AB (SMC), molded epoxy case meeting UL 94 V-0, matte tin-plated leads solderable per J-STD-002/JESD 22-B102, cathode denoted by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential side (e.g., ground or signal return) in uni-directional TVS configuration |
| Cathode | Current exit terminal in forward bias; marked with band | Connected to protected line (e.g., 12 V rail or sensor output); clamps when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| Junction passivation | Optimized die surface treatment prevents parametric drift and leakage increase under high-temperature/humidity stress |
| Low RSURGE | Minimal incremental surge resistance ensures stable clamping voltage across full IPPM range without overshoot |
| Fast response time | Sub-nanosecond turn-on enables suppression of ESD (IEC 61000-4-2) and fast-rising transients before IC damage occurs |
| 185 °C TJ capability | Enables placement near heat sources (e.g., power converters) without derating or thermal shutdown concerns |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against ISO 7637-2 load dump and jump-start transients. IC Role / Device Role / Timing Role: Uni-directional TVS placed between power rail and ground to clamp overvoltage spikes. Use Value: 29.2 V clamping voltage ensures downstream DC-DC regulators and microcontrollers remain within absolute maximum ratings during 3000 W surges. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) TVS connected across signal and ground to suppress EFT bursts without affecting 4–20 mA accuracy. Use Value: 18 V stand-off voltage preserves signal integrity while enabling robust 2 kV ESD (IEC 61000-4-2) immunity on long cable runs. |
| Telecom DC Power Interface | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding PoE-powered network switches against induced surges on 48 V input rails. IC Role / Device Role / Timing Role: Primary TVS on DC input stage, coordinated with upstream fuse and secondary filtering. Use Value: 185 °C junction rating allows uninterrupted operation in sealed enclosures with ambient temperatures up to 105 °C. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Mounted across motor terminals to absorb energy from back-EMF during PWM commutation. Use Value: 200 A IFSM rating withstands repetitive 8.3 ms half-sine surges without degradation over 10,000+ cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same DO-214AC (SMA) package; lower PPPM (400 W); VBR 20.0–22.2 V; TJ max. = 150 °C | Limited to consumer-grade or non-automotive industrial use due to lack of AEC-Q101 and lower thermal rating | Select when cost sensitivity outweighs automotive qualification and 3000 W surge requirement |
| 1.5KE18A | Through-hole DO-201 package; same VWM/VBR; PPPM 1500 W; higher RθJA (60 °C/W); no AEC-Q101 | Suitable only for prototyping or legacy through-hole designs; not viable for automated SMT production | Choose only for manual assembly or backward compatibility where board real estate permits larger footprint |
Compared with SMAJ18A and 1.5KE18A, the 3KASMC18AHE3_A/I delivers triple the peak pulse power, 35 °C higher junction temperature tolerance, and automotive-grade qualification - making it the sole option for production-grade 12 V automotive modules requiring sustained reliability under thermal and electrical stress.
Availability
3KASMC18AHE3_A/I is available at Aetrix Electronics and suitable for automotive control units, industrial sensor interfaces, telecom power supplies, and appliance motor drives requiring stable component supply with guaranteed long-term availability.
Supply support for 3KASMC18AHE3_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, MOSFETs, and protection devices with emphasis on high-reliability and automotive-grade performance.
The 3KASMC18AHE3_A/I belongs to Vishay's PAR® (Protection Against Transients) family, engineered specifically for robust transient suppression in harsh automotive and industrial environments where AEC-Q101 compliance and 185 °C operation are mandatory.
FAQ
What is the clamping voltage of the 3KASMC18AHE3_A/I under full-rated surge current?
The 3KASMC18AHE3_A/I exhibits a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current (IPPM) of 103 A using the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay Document 89962 and ensures downstream components remain within safe operating limits during transient events.
Is the 3KASMC18AHE3_A/I qualified for automotive applications?
Yes, the 3KASMC18AHE3_A/I is fully AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JEDEC standards. Its 185 °C maximum junction temperature and MSL Level 1 rating further validate its suitability for under-hood and body-control module deployments.
What does the "_A/I" suffix indicate in 3KASMC18AHE3_A/I?
The "_A/I" suffix in 3KASMC18AHE3_A/I denotes the packaging configuration: "A" indicates the base part meets RoHS-compliant and AEC-Q101 qualified specifications, and "I" specifies 13-inch diameter plastic tape-and-reel delivery with a base quantity of 3500 units - confirmed in the Ordering Information table of Vishay Document 89962.
How does the thermal resistance of the 3KASMC18AHE3_A/I affect PCB layout?
The 3KASMC18AHE3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 18.3 °C/W, meaning effective copper pour on both pads is essential to dissipate 6.0 W continuous power. Vishay recommends minimum pad dimensions of 0.126″ × 0.185″ per lead to maintain thermal performance and avoid exceeding TJ = 185 °C under sustained load.
Can the 3KASMC18AHE3_A/I be used in bi-directional configurations?
No, the 3KASMC18AHE3_A/I is strictly uni-directional, as confirmed in the FEATURES section of Vishay Document 89962. It must be oriented with the cathode band toward the protected line. For bi-directional protection, a separate device such as the 3KASMC18CA (center-tapped dual) would be required - the 3KASMC18AHE3_A/I does not support reverse-bias clamping.
3KASMC18AHE3_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:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 103A
- 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)
3KASMC18AHE3_A/I FAQ
1.How can I place an order for 3KASMC18AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18AHE3_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 3KASMC18AHE3_A/I reliable?
The price and inventory of 3KASMC18AHE3_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 3KASMC18AHE3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC18AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18AHE3_A/I?
3KASMC18AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18AHE3_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 3KASMC18AHE3_A/I?
For technical support, including 3KASMC18AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18AHE3_A/I requirements.
6.How does Aetrix verify that 3KASMC18AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC18AHE3_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 3KASMC18AHE3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC18AHE3_A/I?
All 3KASMC18AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18AHE3_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 3KASMC18AHE3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC18AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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