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Vishay General Semiconductor - Diodes Division 3KASMC33AHM3_A/I
- Part No.:
- 3KASMC33AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC33AHM3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,880
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Product details
Overview
3KASMC33AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® 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 power rail and sensor line protection against load dump and inductive switching transients.
For engineers reviewing the 3KASMC33AHM3_A/I datasheet, 3KASMC33AHM3_A/I pinout, 3KASMC33AHM3_A/I application, or 3KASMC33AHM3_A/I equivalent, key selection criteria include unidirectional clamping behavior, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, 77.5 °C/W junction-to-ambient thermal resistance, and compatibility with high-reliability automotive PCB layouts requiring RoHS-compliant, whisker-tested matte tin terminations.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for stable clamping under high-temperature stress (TJ up to 185 °C), enabling operation in under-hood automotive environments without derating loss. Its unidirectional polarity supports DC-biased signal and power lines where reverse conduction must be blocked during normal operation.
The device delivers 3000 W peak pulse power handling with low incremental surge resistance and fast response time, ensuring effective suppression of transient energy from inductive load switching (e.g., solenoids, motors) while maintaining <1.0 μA reverse leakage at 33 V stand-off voltage and 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin for protected circuitry. |
| VBR (min/max) | 36.7 V / 40.6 V at 1.0 mA - Breakdown voltage range confirming reliable turn-on threshold under production tolerance. |
| VC @ IPPM | 53.3 V at 56.3 A - Clamping voltage during 10/1000 μs surge; determines maximum voltage seen by downstream ICs during transient events. |
| PPPM | 3000 W - Peak pulse power rating per 10/1000 μs waveform; quantifies transient energy absorption capability without failure. |
| TJ max. | 185 °C - Enables sustained operation in high-temperature automotive zones (e.g., engine control units, battery management systems). |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 mm × 6.22 mm footprint and 3.20 mm height; supports automated assembly and thermal relief via lead-frame design. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
Pinout & Package
DO-214AB (SMC) package with two terminals: cathode (marked by color band) and anode. Designed for surface-mount reflow soldering on standard PCB pads per Vishay-recommended layout (0.126″ min. pad width, 0.185″ max. length). Matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability requirements and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VWM exceeded; polarity-critical for unidirectional operation. |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping path during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR and low leakage across 150 °C operating range. |
| High-temperature capability | TJ = 185 °C enables placement near heat sources (e.g., power converters) without thermal derating penalties. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking - simplifies SMT manufacturing flow. |
| Low clamping ratio | VC/VWM = 1.62 ensures minimal overvoltage overshoot relative to working voltage, protecting 3.3 V/5 V/12 V logic interfaces. |
| RoHS + whisker-tested | HM3 suffix confirms compliance with JEDEC JESD201 Class 2 and EU Directive 2011/65/EU - suitable for automotive Tier-1 supply chains. |
Applications
| Automotive Power Rail Protection | Engine Control Unit (ECU) Sensor Inputs |
|---|---|
Use Scenario: Suppresses load dump transients (up to 60 V, 100 ms) on 12 V battery-fed microcontroller power rails in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS clamps overvoltage spikes before they reach LDO regulators and MCU VCC pins. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic cores during alternator regulation failure, validated per ISO 7637-2 Pulse 5a. |
Use Scenario: Shields analog front-end inputs (e.g., MAP, TPS sensors) from inductive kickback generated by nearby fuel injector drivers. IC Role / Device Role / Timing Role: Fast-response TVS limits transient voltage to ≤53.3 V during sub-100 ns events, preserving ADC reference integrity. Use Value: Maintains sensor signal fidelity and avoids false fault codes in OBD-II diagnostics under harsh EMI conditions. |
| Industrial Motor Drive I/O Protection | Telecom Power Interface |
Use Scenario: Installed on 24 V DC control lines feeding PLC output modules driving solenoid valves and contactors. IC Role / Device Role / Timing Role: Absorbs repetitive 3000 W surges from coil de-energization without degradation over >100,000 cycles. Use Value: Eliminates need for external snubbers or varistors, reducing BOM count and board space in DIN-rail mounted controllers. |
Use Scenario: Protects PoE-powered Ethernet switch ports (IEEE 802.3af/at) against lightning-induced surges on 48 V DC input rails. IC Role / Device Role / Timing Role: Clamps common-mode transients between power pair and chassis ground with low capacitance (<100 pF). Use Value: Meets IEC 61000-4-5 Level 4 (4 kV) immunity without compromising data rate integrity on adjacent signal pairs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T (Vishay) | Same DO-214AC (SMA) package; lower PPPM = 400 W; VC = 53.3 V at 7.5 A; RθJA = 110 °C/W. | Targeted for cost-sensitive consumer electronics; insufficient for automotive load dump per ISO 7637-2. | Select 3KASMC33AHM3_A/I when 3000 W surge handling and 185 °C operation are mandatory. |
| 1.5KE33CA (ON Semiconductor) | Through-hole DO-201AE package; bidirectional; PPPM = 1500 W; VC = 53.3 V at 28.3 A; not AEC-Q101 qualified. | Suitable for lab prototypes or non-automotive industrial use; incompatible with SMT-only production lines. | Choose 3KASMC33AHM3_A/I for surface-mount automotive designs requiring AEC-Q101 traceability and MSL-1 handling. |
Compared with SMAJ33A-E3/57T and 1.5KE33CA, the 3KASMC33AHM3_A/I provides triple the peak pulse power, 35% lower thermal resistance, and full automotive qualification - making it the only option among the three validated for under-hood deployment with zero layout compromise.
Availability
3KASMC33AHM3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, engine control unit sensor interface hardening, and industrial motor drive I/O conditioning requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant traceability.
Supply support for 3KASMC33AHM3_A/I 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The 3KASMC33AHM3_A/I belongs to Vishay's PAR® (Protected Anisotropic Rectifier) TVS family, engineered specifically for automotive-grade transient suppression with extended temperature capability and robust surge endurance.
FAQ
What is the clamping voltage of the 3KASMC33AHM3_A/I at its rated peak pulse current?
The 3KASMC33AHM3_A/I exhibits a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current (IPPM) of 56.3 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 53.3 V during worst-case transient events, directly supporting 3.3 V, 5 V, and 12 V logic interface protection. The 3KASMC33AHM3_A/I maintains this performance across its full operating temperature range.
Is the 3KASMC33AHM3_A/I qualified for automotive applications?
Yes, the 3KASMC33AHM3_A/I is AEC-Q101 qualified and designed explicitly for automotive use cases. It meets rigorous stress tests including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock per JEDEC standards. Its 185 °C maximum junction temperature, MSL Level 1 rating, and RoHS-compliant matte tin terminations satisfy Tier-1 supplier requirements for engine control units, body electronics, and ADAS subsystems. The 3KASMC33AHM3_A/I carries the HM3 suffix confirming full qualification.
What package type does the 3KASMC33AHM3_A/I use, and what are its key mechanical features?
The 3KASMC33AHM3_A/I uses the DO-214AB (SMC) surface-mount package, measuring 7.11 mm × 6.22 mm × 3.20 mm with a cathode band marking. Its molding compound meets UL 94 V-0 flammability rating, and leads are matte tin-plated per J-STD-002 and JESD 22-B102. The HM3 suffix confirms compliance with JESD 201 Class 2 whisker resistance. The 3KASMC33AHM3_A/I is supplied in 13″ tape-and-reel (3500 pcs/reel) with I packaging code.
How does the 3KASMC33AHM3_A/I compare to standard SMAJ-series TVS diodes in surge handling capability?
The 3KASMC33AHM3_A/I delivers 3000 W peak pulse power (10/1000 μs), which is 7.5× higher than the 400 W rating of the SMAJ33A-E3/57T. It also features lower thermal resistance (77.5 °C/W vs. 110 °C/W) and higher surge current capacity (56.3 A vs. 7.5 A). Unlike the SMAJ series, the 3KASMC33AHM3_A/I is rated for 185 °C operation and AEC-Q101 qualification - making the 3KASMC33AHM3_A/I suitable for under-hood automotive applications where the SMAJ series would thermally saturate or fail qualification.
What is the reverse leakage current specification for the 3KASMC33AHM3_A/I at its stand-off voltage?
The 3KASMC33AHM3_A/I specifies a maximum reverse leakage current (IR) of 1.0 μA at its 33 V stand-off voltage (VWM) and 25 °C ambient temperature. At elevated temperature (TJ = 150 °C), leakage remains ≤15 μA - ensuring minimal standby power loss and signal integrity in always-on automotive modules. This low leakage is maintained due to junction passivation and optimized anisotropic rectifier design, distinguishing the 3KASMC33AHM3_A/I from generic TVS diodes with higher drift.
3KASMC33AHM3_A/I 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)
3KASMC33AHM3_A/I FAQ
1.How can I place an order for 3KASMC33AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC33AHM3_A/I 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_A/I reliable?
The price and inventory of 3KASMC33AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC33AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC33AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC33AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC33AHM3_A/I?
3KASMC33AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC33AHM3_A/I 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_A/I?
For technical support, including 3KASMC33AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC33AHM3_A/I requirements.
6.How does Aetrix verify that 3KASMC33AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC33AHM3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC33AHM3_A/I?
All 3KASMC33AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC33AHM3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for 3KASMC33AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC33AHM3_A/I Tags
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