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Vishay General Semiconductor - Diodes Division 3KASMC33AHM3_B/H
- Part No.:
- 3KASMC33AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC33AHM3_B/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,594
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Product details
Overview
3KASMC33AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor in SMC (DO-214AB) package, rated for 33 V stand-off voltage (VWM), 38.7 V nominal breakdown (VBR), 53.3 V clamping voltage at 56.3 A peak pulse current, and 3000 W peak pulse power with 10/1000 μs waveform - deployed for automotive power rail and sensor line protection.
For engineers reviewing the 3KASMC33AHM3_B/H datasheet, 3KASMC33AHM3_B/H pinout, 3KASMC33AHM3_B/H application, or 3KASMC33AHM3_B/H equivalent, key selection criteria include AEC-Q101 qualification, TJ = 185 °C operation, halogen-free RoHS compliance, and unidirectional clamping behavior under high-energy transients.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to deliver stable clamping performance across -65 °C to +185 °C junction temperature range. Its low incremental surge resistance and fast response time enable effective suppression of inductive switching spikes and ESD-like transients on 12 V and 24 V automotive power nets.
The device operates exclusively in unidirectional mode with cathode-band polarity marking, requires no external biasing, and achieves thermal resistance of 18.3 °C/W (junction-to-leads) when mounted per recommended pad layout - supporting reliable operation under sustained surge stress without derating below 125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 12 V/24 V systems. |
| VBR (nom) | 38.7 V - nominal breakdown voltage at 1 mA test current; ensures predictable turn-on threshold during transient events. |
| VC @ IPPM | 53.3 V - clamping voltage at 56.3 A peak pulse current; limits downstream IC voltage stress during 3000 W surges. |
| PPPM | 3000 W - peak pulse power handling with 10/1000 μs waveform; meets ISO 7637-2 Pulse 1/2/5a robustness requirements. |
| TJ max | +185 °C - maximum junction temperature rating; supports under-hood deployment in AEC-Q101-compliant automotive modules. |
| Polarity | Unidirectional - blocks reverse conduction only; suited for DC power rail protection where forward conduction is not required. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.06 mm lead spacing. |
Pinout & Package
Package: SMC (DO-214AB), molded case meeting UL 94 V-0 flammability rating; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards; cathode denoted by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during clamping | Connected to protected circuit ground or low-side return path; carries full surge current during transient events. |
| Cathode | Current exit terminal during clamping | Connected to protected line (e.g., battery rail or signal line); voltage referenced to anode during clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR over lifetime and temperature; eliminates parametric drift in harsh environments. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, HAST, and mechanical shock testing - required for engine control and ADAS modules. |
| Halogen-free & RoHS | HM3 suffix confirms halogen-free molding compound and lead finish - satisfies EU ELV and OEM sustainability mandates. |
| MSL Level 1 | Rated for reflow up to 260 °C peak; enables standard SMT assembly without moisture sensitivity concerns or baking requirements. |
| Low RSURGE | Minimal incremental surge resistance ensures tight clamping window between VBR and VC - reduces overshoot risk for sensitive 3.3 V/5 V logic. |
Applications
| Automotive Power Rail Protection | Engine Control Unit (ECU) Input Protection |
|---|---|
Use Scenario: Suppresses load dump and alternator ripple transients on 12 V battery-fed power rails in body control modules. IC Role / Device Role: Unidirectional shunt clamp placed between VBAT and GND, triggered by >33 V excursions. Use Value: Limits rail voltage to ≤53.3 V during 3000 W pulses, preventing damage to MCU power supplies and CAN transceivers. |
Use Scenario: Protects microcontroller GPIO and analog sensor inputs from inductive kickback in solenoid-driven subsystems. IC Role / Device Role: Localized TVS at connector interface or PCB edge, oriented cathode-to-signal-line. Use Value: Responds in <1 ns to clamp 100 V/100 ns spikes to safe levels, preserving ADC accuracy and I/O integrity. |
| ADAS Camera Module Power Line | Industrial PLC Digital Input Protection |
Use Scenario: Shields 5 V or 12 V camera power supply from ESD and cable discharge events in rear-view and surround-view systems. IC Role / Device Role: Primary overvoltage guard on main power input, upstream of LDO regulators. Use Value: Maintains TJ ≤185 °C during repeated 30 kV contact ESD strikes, ensuring uninterrupted video stream operation. |
Use Scenario: Guards 24 V digital input channels against field-wiring transients and relay coil flyback in factory automation controllers. IC Role / Device Role: Discrete TVS on each input channel, configured cathode-to-24 V rail for positive-going surge suppression. Use Value: Withstands 200 A non-repetitive surge (IFSM), enabling long-term reliability in high-noise industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33AHE3_A/H | Same VWM (33 V), lower PPPM (400 W), SMC package, HE3 suffix (RoHS/AEC-Q101 but not halogen-free) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or load dump simulation | Select when cost sensitivity outweighs 3000 W requirement and halogen-free status is not mandated. |
| SMCJ33AHM3_A/H | Same VWM (33 V), identical PPPM (3000 W), same HM3 halogen-free/RoHS/AEC-Q101 spec, but larger SMC package variant with higher IFSM (400 A) | Higher surge endurance allows use in primary battery feed lines with extended fault duration | Prefer when system-level surge testing exceeds 200 A single-pulse requirement or when design margin for IFSM is critical. |
Compared with 3KASMC33AHM3_B/H, SMAJ33AHE3_A/H offers reduced surge capability and no halogen-free assurance, while SMCJ33AHM3_A/H provides identical clamping performance with enhanced surge current headroom - making it suitable for higher-stress front-end protection points.
Availability
3KASMC33AHM3_B/H is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and ADAS camera modules requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for 3KASMC33AHM3_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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMCxxA family targets automotive and industrial transient suppression, engineered for 185 °C operation, AEC-Q101 compliance, and robust 10/1000 μs surge handling - addressing stringent EMC and functional safety requirements.
FAQ
What is the clamping voltage of the 3KASMC33AHM3_B/H at its rated peak pulse current?
The 3KASMC33AHM3_B/H has a maximum clamping voltage (VC) of 53.3 V at 56.3 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see limited overvoltage during standardized surge events. The 3KASMC33AHM3_B/H maintains this clamping performance across its full operating temperature range.
Is the 3KASMC33AHM3_B/H qualified for automotive applications?
Yes, the 3KASMC33AHM3_B/H is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix HM3. It undergoes stress testing including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - making it suitable for engine bay, transmission control, and ADAS applications where reliability at TJ = 185 °C is mandatory. The 3KASMC33AHM3_B/H meets all applicable AEC-Q101 test conditions.
What does the "HM3" suffix indicate in 3KASMC33AHM3_B/H?
The "HM3" suffix in 3KASMC33AHM3_B/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It specifies a molding compound free of bromine, chlorine, and other regulated halogens, plus matte tin-plated leads passing JESD 201 Class 2 whisker testing. This distinguishes it from HE3-suffixed variants and aligns with OEM environmental compliance requirements. The 3KASMC33AHM3_B/H is fully traceable to these material specifications.
What is the maximum junction temperature rating for the 3KASMC33AHM3_B/H?
The 3KASMC33AHM3_B/H is rated for a maximum junction temperature (TJ max) of +185 °C, verified per Vishay's thermal characterization and AEC-Q101 qualification. This enables operation in under-hood automotive environments and high-power industrial enclosures without thermal derating below 125 °C ambient. The 3KASMC33AHM3_B/H sustains electrical parameters within specification up to this limit when mounted per recommended pad layout.
How does the 3KASMC33AHM3_B/H differ from the 3KASMC33AHE3_B/H?
The 3KASMC33AHM3_B/H uses a halogen-free molding compound and lead finish, whereas the 3KASMC33AHE3_B/H is RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both share identical electrical specs (VWM = 33 V, VBR = 38.7 V, VC = 53.3 V), package (SMC), and thermal ratings. The 3KASMC33AHM3_B/H meets stricter OEM sustainability mandates, while the HE3 version may be selected where halogen content is unrestricted. The 3KASMC33AHM3_B/H is the preferred choice for Tier 1 automotive supply chains.
3KASMC33AHM3_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):
- 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)
3KASMC33AHM3_B/H FAQ
1.How can I place an order for 3KASMC33AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC33AHM3_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 3KASMC33AHM3_B/H reliable?
The price and inventory of 3KASMC33AHM3_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 3KASMC33AHM3_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC33AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC33AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC33AHM3_B/H?
3KASMC33AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC33AHM3_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 3KASMC33AHM3_B/H?
For technical support, including 3KASMC33AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC33AHM3_B/H requirements.
6.How does Aetrix verify that 3KASMC33AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC33AHM3_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 3KASMC33AHM3_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC33AHM3_B/H?
All 3KASMC33AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC33AHM3_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 3KASMC33AHM3_B/H part is unused and in its original packaging.
Return procedure for 3KASMC33AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC33AHM3_B/H Tags
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