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Vishay General Semiconductor - Diodes Division 3KASMC18AHM3_B/H
- Part No.:
- 3KASMC18AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18AHM3_B/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,719
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Product details
Overview
3KASMC18AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor in SMC (DO-214AB) package, rated for 18 V stand-off voltage, 21.1 V nominal breakdown voltage at 1 mA, 3000 W peak pulse power (10/1000 μs), 103 A peak pulse current, and 29.2 V clamping voltage at IPPM - deployed for automotive power rail and sensor line surge protection.
For engineers reviewing the 3KASMC18AHM3_B/H datasheet, 3KASMC18AHM3_B/H pinout, 3KASMC18AHM3_B/H application, or 3KASMC18AHM3_B/H equivalent, key selection criteria include TJ = 185 °C operation, AEC-Q101 qualification, halogen-free RoHS compliance, low incremental surge resistance, and MSL Level 1 reflow capability up to 260 °C.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for high-temperature stability. It delivers 3000 W peak pulse power handling under 10/1000 μs waveform while maintaining clamping voltage ≤29.2 V at 103 A.
Designed for unidirectional polarity only, it features low thermal resistance (RθJL = 18.3 °C/W), operates from –65 °C to +185 °C, and meets JESD201 Class 2 whisker testing - confirming suitability for automotive under-hood and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (nom) | 21.1 V at 1 mA - precise breakdown threshold enabling accurate overvoltage detection |
| VC @ IPPM | 29.2 V at 103 A - low clamping voltage limits downstream IC stress during transients |
| PPPM | 3000 W (10/1000 μs) - robust surge immunity for automotive load-dump and ISO 7637-2 pulses |
| TJ max | +185 °C - supports placement near high-power components without derating |
| Package | SMC (DO-214AB) - industry-standard footprint with 7.75 mm × 6.22 mm body and 1.52 mm lead pitch |
| AEC-Q101 | Qualified - validated for automotive reliability per stress test requirements |
| MSL Level | Level 1 (260 °C peak) - compatible with standard lead-free reflow profiles without baking |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, cathode indicated by molded band. Dimensions: 7.75 mm × 6.22 mm × 2.30 mm (L × W × H), matte tin-plated leads solderable per J-STD-002/JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected circuit ground or low-side return path |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., 12 V rail or sensor signal); color band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage performance and long-term reliability at TJ = 185 °C |
| 3000 W peak pulse power (10/1000 μs) | Withstands severe automotive transients including load dump and inductive switching spikes |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response time) |
| Halogen-free, RoHS-compliant construction | Meets automotive environmental compliance standards (Vishay HM3 suffix) |
| MSL Level 1 rating | Eliminates pre-reflow baking requirement, reducing manufacturing cost and cycle time |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against ISO 7637-2 pulse 5a (load dump) and pulse 1 (inductive switch-off). IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transient overvoltage. Use Value: Clamps to ≤29.2 V at 103 A, preventing damage to downstream PMICs and microcontrollers rated for 36 V absolute max. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation systems exposed to relay coil kickback. IC Role / Device Role / Timing Role: TVS connected across differential signal pair or single-ended output to suppress ESD and switching noise. Use Value: 21.1 V breakdown ensures no interference during normal 0–5 V or 0–10 V sensor operation while reacting within nanoseconds to >1 kV transients. |
| Telecom Line Interface Protection | Consumer Power Adapter Input Protection |
Use Scenario: Shielding Ethernet PHY power pins and bias rails from lightning-induced surges on PoE-powered infrastructure equipment. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input side of isolated DC/DC converter. Use Value: 3000 W rating handles multi-pulse surge events per IEC 61000-4-5, while 185 °C TJ rating supports sealed enclosure thermal conditions. | Use Scenario: Guarding AC-DC adapter primary-side bulk capacitor inputs against mains overvoltage and surge events. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bridge rectifier output to limit voltage spikes before smoothing capacitor. Use Value: 29.2 V clamping prevents overvoltage stress on electrolytic capacitors and secondary-side controllers during brownout recovery transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18AHE3_A/H | Same SMC package, 18 V VWM, but lower PPPM = 400 W and VC = 29.2 V at 13.7 A | Not suitable for automotive load dump; limited to low-energy ESD and signal-line protection | Select when surge energy is <50 mJ and space-constrained layouts require same footprint |
| TPSMD18A | 18 V VWM, 3000 W PPPM, but VBR min = 20.0 V and VC = 29.2 V at 103 A - identical clamping, different temp coefficient (αT = 0.075 %/°C vs. 0.083 %/°C) | Also AEC-Q101 qualified; differs in thermal resistance (RθJA = 70 °C/W vs. 77.5 °C/W) | Prefer for higher ambient thermal budgets where junction-to-ambient cooling is more critical than junction-to-lead |
Compared with SMAJ18AHE3_A/H and TPSMD18A, the 3KASMC18AHM3_B/H provides superior surge energy handling at identical clamping voltage while offering halogen-free construction and tighter VBR tolerance (±5%), making it optimal for AEC-Q101-compliant automotive power domains requiring repeatable failure thresholds.
Availability
3KASMC18AHM3_B/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom power supplies, and consumer power adapters requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 3KASMC18AHM3_B/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, 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 Real-world transients) family, engineered specifically for harsh-environment transient suppression in automotive, industrial, and telecom infrastructure where sustained 185 °C operation and AEC-Q101 validation are mandatory.
FAQ
What is the maximum junction temperature rating for the 3KASMC18AHM3_B/H?
The 3KASMC18AHM3_B/H is rated for a maximum junction temperature (TJ) of +185 °C, enabling reliable operation in under-hood automotive environments and high-temperature industrial enclosures. This rating is validated per AEC-Q101 stress tests and supported by its thermal resistance profile (RθJL = 18.3 °C/W). The 3KASMC18AHM3_B/H maintains specified electrical parameters across the full –65 °C to +185 °C range.
Is the 3KASMC18AHM3_B/H AEC-Q101 qualified?
Yes, the 3KASMC18AHM3_B/H is AEC-Q101 qualified - confirmed by Vishay's ordering code suffix "HM3", which denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. Qualification covers high-temperature operating life, temperature cycling, and mechanical shock testing per the AEC standard. The 3KASMC18AHM3_B/H documentation explicitly states "AEC-Q101 qualified available" with HM3 suffix meeting JESD201 Class 2 whisker testing.
What does the "HM3" suffix indicate in 3KASMC18AHM3_B/H?
The "HM3" suffix in 3KASMC18AHM3_B/H identifies a halogen-free, RoHS-compliant, and AEC-Q101-qualified variant per Vishay's ordering nomenclature. It distinguishes this part from HE3 (RoHS-compliant, AEC-Q101 qualified, not halogen-free) and confirms compliance with automotive environmental and reliability requirements. The "B/H" denotes packaging: 7-inch tape-and-reel, 850 units per reel.
What is the clamping voltage of the 3KASMC18AHM3_B/H at its rated peak pulse current?
The 3KASMC18AHM3_B/H has a maximum clamping voltage (VC) of 29.2 V at its rated peak pulse current (IPPM) of 103 A, measured using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the operating temperature range and ensures protected circuits remain below critical overvoltage thresholds during surge events.
Does the 3KASMC18AHM3_B/H have unidirectional or bidirectional polarity?
The 3KASMC18AHM3_B/H is unidirectional only, as explicitly stated in the Vishay datasheet under FEATURES: "Available in uni-directional polarity only." Its cathode is marked by a molded band, and it conducts in forward bias like a standard diode while clamping reverse transients - making it suitable for DC power rail protection but not AC line applications without external rectification.
3KASMC18AHM3_B/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):
- 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)
3KASMC18AHM3_B/H FAQ
1.How can I place an order for 3KASMC18AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18AHM3_B/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 3KASMC18AHM3_B/H reliable?
The price and inventory of 3KASMC18AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC18AHM3_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC18AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18AHM3_B/H?
3KASMC18AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18AHM3_B/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 3KASMC18AHM3_B/H?
For technical support, including 3KASMC18AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18AHM3_B/H requirements.
6.How does Aetrix verify that 3KASMC18AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC18AHM3_B/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 3KASMC18AHM3_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC18AHM3_B/H?
All 3KASMC18AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18AHM3_B/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 3KASMC18AHM3_B/H part is unused and in its original packaging.
Return procedure for 3KASMC18AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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