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Vishay General Semiconductor - Diodes Division 3KASMC18AHE3/57T
- Part No.:
- 3KASMC18AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18AHE3/57T.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,603
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Product details
Overview
3KASMC18AHE3/57T 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 (VWM), 20.0–22.1 V breakdown voltage (VBR), 3000 W peak pulse power (10/1000 μs), 103 A peak surge current (IPPM), and 29.2 V clamping voltage (VC) - deployed for automotive power line and sensor signal protection.
For engineers reviewing the 3KASMC18AHE3/57T datasheet, 3KASMC18AHE3/57T pinout, 3KASMC18AHE3/57T application, or 3KASMC18AHE3/57T equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 77.5 °C/W), junction temperature limit (TJ max = 185 °C), and DO-214AB mechanical layout for PCB design and reliability validation.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under high-temperature operation up to 185 °C, with low incremental surge resistance and fast response time for transient suppression on automotive power rails and sensor interfaces. Its unidirectional polarity and 10/1000 μs waveform rating align with IEC 61000-4-5 and ISO 7637-2 surge immunity requirements.
The device meets MSL Level 1 per J-STD-020 (peak reflow ≤ 260 °C), features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and passes JESD 201 Class 2 whisker testing - confirming suitability for automated SMT assembly and long-term field reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (Breakdown Voltage) | 20.0–22.1 V at 1 mA - precise voltage threshold where avalanche conduction initiates |
| PPPM (Peak Pulse Power) | 3000 W (10/1000 μs) - suppresses high-energy transients like load dump or inductive switching spikes |
| VC (Clamping Voltage) | 29.2 V at 103 A - limits downstream IC voltage stress during surge events |
| TJ max | 185 °C - enables operation in under-hood automotive locations without derating |
| RθJA | 77.5 °C/W - defines thermal rise above ambient under natural convection, critical for board-level thermal design |
| AEC-Q101 Qualified | Yes - validated for automotive electronic systems per stress test requirements including HTGB, HTRB, and TCT |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode indicated by color band; dimensions: 7.11 × 6.22 × 2.90 mm (L × W × H); RoHS-compliant, halogen-free, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / surge return path | Connected to ground or low-impedance return in unidirectional TVS configuration |
| Cathode | Clamped output / protected line connection | Connected to the line being protected (e.g., 12 V rail or sensor signal); color band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage performance (<1 μA at VWM) across -65 °C to +185 °C operating range |
| 3000 W peak pulse power (10/1000 μs) | Withstands automotive load-dump surges (ISO 7637-2 Pulse 5a) without degradation |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and high-temperature reverse bias stress |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage margin between breakdown and clamping, improving system-level ESD/surge robustness |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow without moisture-induced failure or delamination |
Applications
| Automotive Power Rail Protection | Engine Control Unit (ECU) Sensor Interface |
|---|---|
Use Scenario: Suppressing load dump transients (up to 60 V, 400 ms) on 12 V battery-fed circuits in vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS clamps excess voltage to protect downstream DC-DC converters and microcontrollers. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies when subjected to ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding analog sensor signals (e.g., oxygen, throttle position) from ESD and coupled noise in engine bays. IC Role / Device Role / Timing Role: Fast-response TVS placed at connector entry point to shunt transients before reaching precision ADC inputs. Use Value: Maintains signal integrity with <1 μA leakage at 18 V, avoiding offset drift in millivolt-level sensor outputs. |
| Industrial Motor Drive I/O Protection | Telecom Power Supply Input Stage |
Use Scenario: Guarding digital I/O lines connected to contactors or relays subject to inductive kickback. IC Role / Device Role / Timing Role: TVS absorbs 3000 W surge energy within nanoseconds to prevent false triggering of optocouplers or GPIO pins. Use Value: Eliminates need for external RC snubbers while meeting IEC 61000-4-4 level 4 (4 kV) immunity requirements. |
Use Scenario: Protecting AC/DC front-end rectifiers and PFC controllers from lightning-induced surges on telecom base station power feeds. IC Role / Device Role / Timing Role: Primary-stage unidirectional TVS clamps incoming transients before bulk capacitor charging circuitry. Use Value: Withstands repeated 10/1000 μs surges up to 103 A without parameter shift, ensuring multi-year field reliability. |
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 PPPM (400 W), same DO-214AC (SMA) package, VBR = 20–22.1 V, VC = 29.2 V | Not AEC-Q101 qualified; limited to consumer/industrial use, not automotive | Select when cost sensitivity outweighs automotive qualification and surge energy requirements are ≤400 W |
| SMCJ18A | Same DO-214AB (SMC) package, identical VWM/VBR/VC, but rated for 1500 W PPPM (10/1000 μs) | Lacks AEC-Q101 qualification and 185 °C TJ rating; suitable for non-automotive industrial designs | Choose if full 3000 W capability is unnecessary and qualification scope is less stringent |
Compared with SMAJ18A and SMCJ18A, the 3KASMC18AHE3/57T delivers triple the peak pulse power (3000 W), guaranteed AEC-Q101 compliance, and extended 185 °C junction operation - making it the only option qualified for under-hood automotive deployment with full load-dump immunity.
Availability
3KASMC18AHE3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial motor control, telecom power systems, and sensor interface designs requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 3KASMC18AHE3/57T 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, high-temperature, and automotive-grade performance.
The 3KASMC series belongs to Vishay's PAR® (Protection Against Risk) transient suppressor family, engineered specifically for AEC-Q101-compliant automotive power line and signal line protection under extreme thermal and surge conditions.
FAQ
What is the clamping voltage of the 3KASMC18AHE3/57T at its rated peak surge current?
The 3KASMC18AHE3/57T 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 ensures protected circuits remain below critical overvoltage thresholds during standardized surge events such as ISO 7637-2 Pulse 5a. The 3KASMC18AHE3/57T maintains this clamping performance across its full operating temperature range.
Is the 3KASMC18AHE3/57T qualified for automotive applications?
Yes, the 3KASMC18AHE3/57T is AEC-Q101 qualified and rated for junction temperatures up to 185 °C, making it suitable for under-hood automotive systems including engine control units, body control modules, and ADAS sensor interfaces. The 3KASMC18AHE3/57T also meets MSL Level 1 and passes JESD 201 Class 2 whisker testing for reliable SMT assembly in automotive production.
What package type does the 3KASMC18AHE3/57T use, and what are its key mechanical features?
The 3KASMC18AHE3/57T uses the DO-214AB (SMC) surface-mount package, measuring 7.11 mm × 6.22 mm × 2.90 mm, with matte tin-plated leads solderable per J-STD-002. Its cathode is marked by a color band, and the molding compound meets UL 94 V-0 flammability rating. The 3KASMC18AHE3/57T is supplied in 7″ tape-and-reel (57T code, 850 units/reel).
How does the 3KASMC18AHE3/57T compare to standard SMAJ or SMCJ series TVS diodes?
The 3KASMC18AHE3/57T provides 3000 W peak pulse power (vs. 400 W for SMAJ18A and 1500 W for SMCJ18A), AEC-Q101 qualification, and 185 °C maximum junction temperature - features not found in standard SMAJ or SMCJ variants. While all three share similar VWM/VBR/VC values, only the 3KASMC18AHE3/57T supports full automotive load-dump immunity and high-temperature reliability.
What is the thermal resistance of the 3KASMC18AHE3/57T, and how does it affect PCB layout?
The 3KASMC18AHE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W under standard JEDEC test conditions. This value assumes minimum recommended pad layout per Vishay's datasheet; increasing copper area or adding thermal vias reduces effective RθJA. For sustained power dissipation, the 3KASMC18AHE3/57T requires careful thermal management to stay within its 185 °C TJ limit.
3KASMC18AHE3/57T 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)
3KASMC18AHE3/57T FAQ
1.How can I place an order for 3KASMC18AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18AHE3/57T 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 3KASMC18AHE3/57T reliable?
The price and inventory of 3KASMC18AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC18AHE3/57T is usually 5 days.
3.What payment methods are accepted for 3KASMC18AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18AHE3/57T?
3KASMC18AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18AHE3/57T 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 3KASMC18AHE3/57T?
For technical support, including 3KASMC18AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18AHE3/57T requirements.
6.How does Aetrix verify that 3KASMC18AHE3/57T is sourced from the original manufacturer or authorized distributors?
All 3KASMC18AHE3/57T 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 3KASMC18AHE3/57T meets industry standards.
7.What is the process for return or replacement of 3KASMC18AHE3/57T?
All 3KASMC18AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18AHE3/57T, 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 3KASMC18AHE3/57T part is unused and in its original packaging.
Return procedure for 3KASMC18AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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