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Vishay General Semiconductor - Diodes Division 3KASMC33HE3_A/H
- Part No.:
- 3KASMC33HE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC33HE3_A/H.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,847
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Product details
Overview
3KASMC33HE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 33 V stand-off voltage, 53.3 V clamping voltage at 56.3 A peak pulse current, 3000 W peak pulse power (10/1000 µs), and 185 °C maximum junction temperature - deployed for automotive-grade overvoltage protection of power rails and signal lines in engine control units and ADAS sensor interfaces.
For engineers reviewing the 3KASMC33HE3_A/H datasheet, 3KASMC33HE3_A/H pinout, 3KASMC33HE3_A/H application, or 3KASMC33HE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, TJ = 185 °C capability, low incremental surge resistance, MSL Level 1 rating, and uni-directional polarity with cathode band marking - critical for high-reliability automotive and industrial transient suppression designs.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to deliver stable clamping performance under repetitive surge stress and elevated ambient temperatures. Its design supports fast response time (<1 ns), low dynamic impedance, and robust thermal stability up to 185 °C junction temperature - enabling reliable operation in under-hood automotive environments.
The device operates exclusively in uni-directional mode with a defined cathode terminal, and is characterized using standardized 10/1000 µs waveform testing per ANSI/IEEE C62.35. It meets JESD22-B102 solderability and JESD201 Class 2 whisker resistance requirements, and is RoHS-compliant with UL 94 V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V automotive systems. |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 53.3 V at IPPM = 56.3 A - Peak voltage seen by protected circuit during 3000 W surge; limits stress on downstream ICs. |
| PPPM (Peak Pulse Power) | 3000 W (10/1000 µs) - Sustains high-energy surges common in load-dump and ISO 7637-2 test pulses. |
| TJ max. | 185 °C - Enables use in high-temperature locations (e.g., near engines or power converters) without derating penalties. |
| IR (Leakage at VWM) | 1.0 µA max at 25 °C - Minimizes standby power loss and avoids false triggering in low-current sensor circuits. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronic modules per stress test requirements including HTRB, HTGB, and TCT. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, molded plastic case with matte tin-plated leads; cathode indicated by color band; compliant with UL 94 V-0 and MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., ground or return path); enables uni-directional clamping from cathode to anode. |
| Cathode | Current exit terminal during reverse-biased clamping | Marked with color band; connected to protected line (e.g., 24 V rail or CAN bus); conducts surge current to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage and breakdown characteristics across 185 °C operating range and long-term reliability under thermal cycling. |
| 3000 W peak pulse power (10/1000 µs) | Withstands severe automotive load-dump transients (ISO 7637-2 Pulse 5a) without degradation or failure. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, chassis, and ADAS applications requiring zero-defect field performance. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD or inductive switching), improving system immunity. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture-related popcorn failure or delamination risk. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protects 24 V supply rail and sensor input lines in engine control modules exposed to load-dump and alternator ripple. IC Role / Device Role / Timing Role: Uni-directional TVS diode providing primary overvoltage clamping at point-of-entry before LDOs and microcontrollers. Use Value: Clamps transients to ≤53.3 V at 56.3 A, preventing latch-up or permanent damage to 33 V-rated interface ICs and analog front-ends. |
Use Scenario: Shields digital input/output terminals of programmable logic controllers against inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor placed across channel inputs/outputs to divert surge energy to ground. Use Value: Maintains <1.0 µA leakage at 33 V, avoiding false triggering in 24 V dry-contact sensing circuits while surviving 3000 W surges. |
| ADAS Camera Power Rail | Telecom DC Power Feeds |
Use Scenario: Secures 12 V power input to surround-view camera modules mounted near vehicle exterior where ESD and lightning-induced surges occur. IC Role / Device Role / Timing Role: Primary transient clamp on main power feed, coordinated with secondary filtering and local decoupling. Use Value: Delivers sub-1 ns response and 185 °C operation, ensuring uninterrupted video stream integrity during hot-cranking and thermal soak conditions. |
Use Scenario: Guards -48 V DC telecom power distribution boards against induced surges from nearby AC mains or lightning coupling. IC Role / Device Role / Timing Role: High-power uni-directional TVS placed at board edge to shunt surge current before reaching DC-DC converters and line cards. Use Value: Withstands 200 A non-repetitive forward surge (IFSM), supporting robust protection architecture without series fuse dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Lower PPPM (400 W), smaller SMA package (DO-214AC), 150 °C TJ max., same VWM/VBR range | Not AEC-Q101 qualified; unsuitable for automotive under-hood use; limited thermal mass for repeated surges | Select only for cost-sensitive consumer or industrial applications with lower surge severity and ambient temperature <125 °C. |
| SMCJ33A | Same DO-214AB package, 3000 W rating, but 150 °C TJ max. and no AEC-Q101 certification | Lacks automotive qualification; thermal derating begins earlier above 125 °C; not validated for automotive lifecycle stress tests | Acceptable for industrial power supplies where AEC-Q101 is not mandated, but requires additional validation for automotive deployment. |
Compared with SMAJ33A and SMCJ33A, the 3KASMC33HE3_A/H provides higher junction temperature capability (185 °C vs. 150 °C), formal AEC-Q101 qualification, and guaranteed performance under extended thermal cycling - making it the only option qualified for direct integration into automotive power domain modules without supplemental qualification.
Availability
3KASMC33HE3_A/H is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, ADAS camera power systems, and telecom DC power feeds requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 3KASMC33HE3_A/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-qualified solutions.
The 3KASMC family is engineered specifically for demanding automotive and industrial transient suppression, delivering enhanced thermal stability and AEC-Q101 compliance in surface-mount SMC packages for under-hood and high-vibration environments.
FAQ
What is the clamping voltage of the 3KASMC33HE3_A/H at its rated peak pulse current?
The 3KASMC33HE3_A/H has a maximum clamping voltage (VC) of 53.3 V at its specified peak pulse current (IPPM) of 56.3 A, measured under the standard 10/1000 µs waveform. This value is confirmed in the Electrical Characteristics table of Vishay document 89962 and defines the upper voltage limit imposed on protected circuits during surge events. The 3KASMC33HE3_A/H maintains this clamping performance across its full operating temperature range up to 185 °C junction temperature.
Is the 3KASMC33HE3_A/H qualified for automotive applications?
Yes, the 3KASMC33HE3_A/H is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (document 89962, page 1). This qualification covers stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), temperature cycling (TCT), and mechanical shock - validating its suitability for automotive powertrain, chassis, and ADAS systems. The 3KASMC33HE3_A/H is designed for under-hood use with full operational capability up to 185 °C junction temperature.
What package type does the 3KASMC33HE3_A/H use, and what are its key mechanical features?
The 3KASMC33HE3_A/H uses the DO-214AB (SMC) surface-mount package, with dimensions of 7.11 mm × 6.22 mm × 2.62 mm (max). Key mechanical features include UL 94 V-0 flammability-rated molding compound, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, cathode identification via color band, and MSL Level 1 rating for lead-free reflow up to 260 °C peak. The 3KASMC33HE3_A/H also meets JESD201 Class 2 whisker resistance requirements.
Does the 3KASMC33HE3_A/H have bidirectional or unidirectional polarity?
The 3KASMC33HE3_A/H is unidirectional only, as confirmed in the Features section of the Vishay datasheet (document 89962, page 1). It functions as a reverse-biased avalanche diode, conducting surge current from cathode to anode when reverse voltage exceeds its breakdown threshold. Polarity is marked by a cathode band on the DO-214AB body, and the 3KASMC33HE3_A/H must be oriented accordingly in circuit layout to protect positive-rail transients.
What is the maximum junction temperature rating for the 3KASMC33HE3_A/H?
The 3KASMC33HE3_A/H has a maximum junction temperature (TJ max.) rating of +185 °C, as specified in the Primary Characteristics table (page 1) and Thermal Characteristics section (page 2) of Vishay document 89962. This rating enables reliable operation in high-temperature automotive environments such as engine compartments and power inverters, where conventional TVS diodes (typically rated to 150 °C) would require significant derating or fail prematurely. The 3KASMC33HE3_A/H sustains full electrical specifications up to this temperature limit.
3KASMC33HE3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 50.8A
- 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)
3KASMC33HE3_A/H FAQ
1.How can I place an order for 3KASMC33HE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC33HE3_A/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 3KASMC33HE3_A/H reliable?
The price and inventory of 3KASMC33HE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC33HE3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC33HE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC33HE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC33HE3_A/H?
3KASMC33HE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC33HE3_A/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 3KASMC33HE3_A/H?
For technical support, including 3KASMC33HE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC33HE3_A/H requirements.
6.How does Aetrix verify that 3KASMC33HE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC33HE3_A/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 3KASMC33HE3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC33HE3_A/H?
All 3KASMC33HE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC33HE3_A/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 3KASMC33HE3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC33HE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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