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Vishay General Semiconductor - Diodes Division 3KASMC33AHM3_B/I
- Part No.:
- 3KASMC33AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC33AHM3_B/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,183
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Product details
Overview
3KASMC33AHM3_B/I 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, 38.7 V nominal breakdown, 53.3 V clamping at 56.3 A peak pulse current, and 3000 W peak pulse power with 10/1000 μs waveform. It operates up to 185 °C junction temperature and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the 3KASMC33AHM3_B/I datasheet, 3KASMC33AHM3_B/I pinout, 3KASMC33AHM3_B/I application, or 3KASMC33AHM3_B/I equivalent, key selection criteria include clamping voltage under surge, thermal resistance (RθJL = 18.3 °C/W), unidirectional polarity, MSL Level 1 rating, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its junction passivation enables reliable operation at TJ = 185 °C and supports automotive-grade reliability under repetitive transient stress.
The device delivers precise clamping performance with a typical temperature coefficient of VBR at 0.091 %/°C and exhibits excellent response time and low leakage (<1 μA at VWM). It is designed for mounting on minimum recommended pad layout per JEDEC DO-214AB standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum reverse stand-off voltage before conduction begins |
| VBR (nom) | 38.7 V at 1.0 mA - guaranteed breakdown threshold for reliable triggering |
| VC @ IPPM | 53.3 V at 56.3 A - clamping voltage limiting downstream circuit stress during transients |
| PPPM | 3000 W (10/1000 μs) - peak surge energy absorption capability |
| TJ max | 185 °C - enables use in under-hood automotive environments without derating |
| RθJL | 18.3 °C/W - low junction-to-lead thermal resistance for efficient heat transfer to PCB |
| Polarity | Unidirectional - protects against positive-going transients only; cathode marked by band |
| MSL Level | Level 1 (260 °C peak) - supports standard SMT reflow without moisture sensitivity concerns |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, UL 94 V-0 molding compound. Cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference; carries full surge current during clamping |
| Cathode | Transient voltage sensing node | Connected to protected line; voltage rise above VBR triggers avalanche conduction |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Enables stable 185 °C operation and long-term reliability under thermal cycling |
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails |
| Halogen-free & RoHS | HM3 suffix confirms compliance with environmental regulations and solderability per J-STD-002/JESD 22-B102 |
| Low Rsurge | Minimizes voltage overshoot during fast transients, improving protection margin for downstream ICs |
| MSL Level 1 | Eliminates bake-out requirement prior to SMT assembly, reducing manufacturing cost and risk |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary clamping element placed between power input and DC/DC converter input stage. Use Value: Clamps 53.3 V at 56.3 A, limiting stress on downstream regulators while surviving repeated 3000 W surges. | Use Scenario: Shielding analog sensor signal lines (e.g., pressure, temperature) from ESD and switching noise in factory automation. IC Role / Device Role / Timing Role: Unidirectional shunt protector on signal line referenced to local ground. Use Value: Sub-1 μA leakage at 33 V ensures minimal signal distortion; fast response preserves signal integrity during fast transients. |
| Telecom Power Supply Input | Consumer Device USB Port Protection |
Use Scenario: Safeguarding AC/DC adapter outputs against lightning-induced surges in PoE-powered telecom equipment. IC Role / Device Role / Timing Role: Front-end transient suppressor on primary-side DC bus before isolation barrier. Use Value: 3000 W peak power rating handles high-energy surges; 185 °C rating supports compact, sealed enclosures. | Use Scenario: Adding robust overvoltage protection to USB-C power delivery inputs in portable audio/video devices. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS line to absorb plug/unplug transients and external ESD events. Use Value: 33 V VWM allows compatibility with 20 V PD3.0 operation; halogen-free HM3 suffix meets consumer product material requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33AHE3_A/H | Lower PPPM (400 W), same VWM/VBR, SMA package (smaller footprint, higher RθJA) | Suitable for space-constrained consumer designs with lower surge exposure | Select when board area is critical and surge threat level is ≤400 W |
| SMCJ33AHE3_A/H | Same SMC package, identical VWM/VBR, but 1500 W PPPM and non-AEC-Q101 rated | Applicable in industrial controls where automotive qualification is not required | Select when AEC-Q101 is unnecessary and cost optimization is prioritized over 3000 W headroom |
Compared with SMAJ33AHE3_A/H and SMCJ33AHE3_A/H, the 3KASMC33AHM3_B/I provides double the surge power rating of the latter and triple that of the former, while delivering AEC-Q101 qualification and halogen-free compliance-making it the preferred choice for high-reliability automotive and industrial deployments requiring sustained 3000 W transient immunity.
Availability
3KASMC33AHM3_B/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom power supply input surge suppression requiring stable component supply across extended production lifecycles.
Supply support for 3KASMC33AHM3_B/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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, thermal performance, and automotive qualification.
The 3KASMC series is part of Vishay's PAR® transient voltage suppressor family, engineered specifically for high-energy surge suppression in harsh environments-including under-hood automotive, industrial motor drives, and outdoor telecom infrastructure.
FAQ
What is the clamping voltage of the 3KASMC33AHM3_B/I at its rated peak pulse current?
The 3KASMC33AHM3_B/I has a maximum clamping voltage (VC) of 53.3 V at its specified peak pulse current (IPPM) of 56.3 A, measured using the standard 10/1000 μs waveform. This value ensures predictable overvoltage limiting for protected circuits and is verified per ANSI/IEEE C62.35. The 3KASMC33AHM3_B/I maintains this clamping performance across its full operating temperature range.
Is the 3KASMC33AHM3_B/I AEC-Q101 qualified and what does the HM3 suffix indicate?
Yes, the 3KASMC33AHM3_B/I is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 19-Jan-2024. The HM3 suffix denotes halogen-free, RoHS-compliant construction with matte tin-plated leads that meet JESD 201 Class 2 whisker testing and solderability per J-STD-002. This makes the 3KASMC33AHM3_B/I suitable for automotive applications requiring both reliability and environmental compliance.
What is the thermal resistance from junction to leads (RθJL) for the 3KASMC33AHM3_B/I?
The 3KASMC33AHM3_B/I has a typical junction-to-leads thermal resistance (RθJL) of 18.3 °C/W, enabling efficient heat transfer from the silicon die to the PCB copper through the leads. This low value supports high-power transient handling without excessive junction temperature rise and is critical for maintaining reliability in high-ambient-temperature environments such as automotive under-hood locations.
How does the 3KASMC33AHM3_B/I differ from the HE3-suffixed version of the same device?
The 3KASMC33AHM3_B/I differs from HE3-suffixed variants solely in material composition: HM3 indicates halogen-free construction, whereas HE3 is RoHS-compliant but not halogen-free. Both versions share identical electrical specifications, AEC-Q101 qualification, SMC package, and thermal performance. The 3KASMC33AHM3_B/I is selected when halogen-free compliance is mandated by end-product environmental policies or regional regulations.
What is the maximum reverse leakage current of the 3KASMC33AHM3_B/I at its stand-off voltage and elevated temperature?
At VWM = 33 V and TJ = 150 °C, the 3KASMC33AHM3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 μA. At room temperature (25 °C), leakage is ≤1.0 μA - ensuring minimal power loss and signal interference in always-on or low-power systems. This tight leakage control is maintained across the full -65 °C to +185 °C operating range.
3KASMC33AHM3_B/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:
- 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 (SMC)
3KASMC33AHM3_B/I FAQ
1.How can I place an order for 3KASMC33AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC33AHM3_B/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_B/I reliable?
The price and inventory of 3KASMC33AHM3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC33AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC33AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC33AHM3_B/I?
3KASMC33AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC33AHM3_B/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_B/I?
For technical support, including 3KASMC33AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC33AHM3_B/I requirements.
6.How does Aetrix verify that 3KASMC33AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC33AHM3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC33AHM3_B/I?
All 3KASMC33AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC33AHM3_B/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_B/I part is unused and in its original packaging.
Return procedure for 3KASMC33AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC33AHM3_B/I Tags
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