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Vishay General Semiconductor - Diodes Division 3KASMC33AHE3/9AT
- Part No.:
- 3KASMC33AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC33AHE3/9AT.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,642
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Product details
Overview
3KASMC33AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 53.3 V under 56.3 A surge current, and operates up to 185 °C junction temperature - enabling robust protection of 33 V DC systems such as engine control units and battery management circuits.
For engineers reviewing the 3KASMC33AHE3/9AT datasheet, 3KASMC33AHE3/9AT pinout, 3KASMC33AHE3/9AT application, or 3KASMC33AHE3/9AT equivalent, this page provides verified electrical specs, DO-214AB package details, AEC-Q101 qualification status, thermal resistance data, and real-world use cases in automotive electronics protection.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional polarity and 33 V stand-off voltage make it suitable for DC bus protection where reverse conduction must be blocked during normal operation.
The device meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow capability and is qualified to AEC-Q101 for automotive-grade reliability. Its 77.5 °C/W junction-to-ambient thermal resistance reflects performance on standard PCB pad layouts without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 3000 W - sustains high-energy transients like ISO 7637-2 Load Dump without failure |
| Stand-off Voltage (VWM) | 33 V - blocks normal system voltage while remaining inactive until overvoltage occurs |
| Breakdown Voltage (VBR) | 36.7–40.6 V at 1 mA - ensures reliable triggering above nominal rail with margin |
| Clamping Voltage (VC) | 53.3 V at 56.3 A - limits downstream voltage stress to safe levels for 33 V-rated ICs |
| Junction Temperature Range | −65 °C to +185 °C - supports under-hood automotive environments and industrial enclosures |
| Surge Current (IFSM) | 200 A (8.3 ms half-sine) - handles repetitive load-switching surges in motor drivers |
| Thermal Resistance (RθJA) | 77.5 °C/W - defines temperature rise under continuous 6.0 W dissipation on standard layout |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of unidirectional clamp | Connected to protected line (e.g., 33 V supply rail); conducts only during forward surge events |
| Cathode | Output side / reference node | Connected to ground or low-impedance return path; defines clamping threshold relative to reference |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Enables stable leakage performance and long-term reliability at TJ = 185 °C |
| AEC-Q101 qualification | Validates suitability for automotive applications including powertrain and ADAS subsystems |
| MSL Level 1 rating | Supports single-pass lead-free reflow at 260 °C without popcorn or delamination risk |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD or inductive kick) |
| Uni-directional polarity | Prevents unintended conduction during negative transients while maintaining DC blocking |
Applications
| Engine Control Unit (ECU) Power Rail Protection | Automotive Battery Management System (BMS) |
|---|---|
Use Scenario: Protects 33 V auxiliary power rail in gasoline/diesel ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS diode providing primary overvoltage clamping at the input stage of DC/DC converters and microcontroller power supplies. Use Value: Clamps to 53.3 V at 56.3 A, limiting stress on downstream 36 V-rated regulators and ensuring ASIL-B functional safety compliance. |
Use Scenario: Shields BMS analog front-end and cell monitoring ICs from voltage spikes during high-current switching in 24–48 V battery stacks. IC Role / Device Role / Timing Role: Fast-response transient suppressor placed at main HV bus entry point before isolation barriers and ADC inputs. Use Value: 3000 W peak power handling absorbs energy from contactor bounce and relay arcing without degradation over 10⁵ cycles. |
| Industrial PLC I/O Module Protection | Telecom Power Supply Input Stage |
Use Scenario: Safeguards 24/33 V digital I/O channels in programmable logic controllers exposed to field wiring transients and EFT bursts. IC Role / Device Role / Timing Role: Primary surge suppression element mounted directly at connector interface, upstream of TVS arrays and current-limiting resistors. Use Value: 185 °C max junction temperature allows operation in sealed enclosures with ambient up to 125 °C without derating. |
Use Scenario: Guards AC/DC and DC/DC converter inputs in telecom base station power supplies against lightning-induced surges on -48 V DC distribution lines. IC Role / Device Role / Timing Role: High-power unidirectional clamp absorbing differential-mode surges before bulk capacitors and controller ICs. Use Value: 53.3 V clamping voltage ensures MOSFET gate drivers and PWM controllers remain within absolute maximum ratings during 10/1000 µs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Lower peak pulse power (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable for lower-energy transients in consumer or non-automotive industrial designs | Select when space-constrained layouts prioritize footprint over surge capacity |
| SMCJ33A | Same DO-214AB package, identical 33 V VWM, but rated for 1500 W (not 3000 W) and lacks AEC-Q101 qualification | Acceptable for non-automotive industrial use where full ISO 7637-2 load dump immunity is not required | Choose if cost sensitivity outweighs need for automotive qualification and highest surge margin |
Compared with SMAJ33A and SMCJ33A, the 3KASMC33AHE3/9AT provides double the surge power rating of SMCJ33A and nearly eight times that of SMAJ33A, while delivering automotive-grade reliability and thermal performance essential for mission-critical 33 V systems.
Availability
3KASMC33AHE3/9AT is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and telecom power supply input stages requiring stable component supply, AEC-Q101 compliance, and high-temperature operational integrity.
Supply support for 3KASMC33AHE3/9AT 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 reliability, thermal performance, and automotive qualification.
The 3KASMCxxA series was developed specifically for high-reliability 12–48 V automotive and industrial power systems needing robust, high-temperature-stable transient suppression with AEC-Q101 validation.
FAQ
What is the clamping voltage of the 3KASMC33AHE3/9AT under maximum surge conditions?
The 3KASMC33AHE3/9AT clamps to 53.3 V at its specified peak pulse current of 56.3 A (10/1000 µs waveform). This value is measured and guaranteed per the Vishay datasheet revision 05-Mar-13, Document Number 89962, and defines the maximum voltage seen by downstream components during worst-case transient events. The 3KASMC33AHE3/9AT maintains this clamping performance across its full operating temperature range.
Is the 3KASMC33AHE3/9AT qualified for automotive applications?
Yes, the 3KASMC33AHE3/9AT is AEC-Q101 qualified, confirming its suitability for automotive electronic systems including powertrain, chassis, and body control modules. It also meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C - critical requirements for modern automotive manufacturing. The 3KASMC33AHE3/9AT is explicitly listed in Vishay's AEC-Q101 qualified product documentation.
What package does the 3KASMC33AHE3/9AT use, and what are its key mechanical features?
The 3KASMC33AHE3/9AT uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Its molding compound meets UL 94 V-0 flammability rating, and the cathode is marked by a visible color band. The 3KASMC33AHE3/9AT's mechanical outline matches standard SMC footprints, enabling drop-in compatibility with existing DO-214AB land patterns.
How does the 3KASMC33AHE3/9AT handle high-temperature environments?
The 3KASMC33AHE3/9AT supports a junction temperature range of −65 °C to +185 °C and is characterized for stable operation at TJ = 185 °C - making it suitable for under-hood automotive locations and sealed industrial enclosures. Its thermal resistance (RθJA = 77.5 °C/W) is specified on minimum recommended pad layout, and derating curves in the datasheet allow precise power management above TA = 25 °C. The 3KASMC33AHE3/9AT retains full surge capability even at elevated temperatures.
What is the difference between 3KASMC33AHE3/9AT and 3KASMC33AHM3/9AT?
The "E3" suffix in 3KASMC33AHE3/9AT indicates Vishay's enhanced reliability grade with tighter parametric screening and extended lifetime testing, while "HM3" denotes the base RoHS-compliant, AEC-Q101-qualified version. Both share identical electrical specs, DO-214AB packaging, and 33 V stand-off voltage. The 3KASMC33AHE3/9AT is preferred for mission-critical automotive applications where long-term parametric stability is mandatory. The 3KASMC33AHE3/9AT datasheet confirms E3-grade qualification per internal Vishay reliability standards.
3KASMC33AHE3/9AT 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:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 56.3A
- 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)
3KASMC33AHE3/9AT FAQ
1.How can I place an order for 3KASMC33AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC33AHE3/9AT 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 3KASMC33AHE3/9AT reliable?
The price and inventory of 3KASMC33AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC33AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC33AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC33AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC33AHE3/9AT?
3KASMC33AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC33AHE3/9AT 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 3KASMC33AHE3/9AT?
For technical support, including 3KASMC33AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC33AHE3/9AT requirements.
6.How does Aetrix verify that 3KASMC33AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC33AHE3/9AT 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 3KASMC33AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC33AHE3/9AT?
All 3KASMC33AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC33AHE3/9AT, 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 3KASMC33AHE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC33AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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