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Vishay General Semiconductor - Diodes Division 3KASMC33AHE3_B/H
- Part No.:
- 3KASMC33AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC33AHE3_B/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,306
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Product details
Overview
3KASMC33AHE3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for high-energy surge protection 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 MOSFETs and ICs against inductive switching transients in engine control units and power converters.
For engineers reviewing the 3KASMC33AHE3_B/H datasheet, 3KASMC33AHE3_B/H pinout, 3KASMC33AHE3_B/H application, or 3KASMC33AHE3_B/H equivalent, key selection criteria include its 33 V stand-off voltage, AEC-Q101 qualification, SMC (DO-214AB) package compatibility with automated assembly, and verified thermal stability under sustained high-temperature operation.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve low incremental surge resistance and excellent clamping linearity across its 36.7–40.6 V breakdown range. Its unidirectional polarity and 1.0 mA test current ensure precise triggering during positive-going transients on DC power lines.
The device is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits a +0.091 %/°C temperature coefficient of VBR, enabling predictable voltage shift over its full -65 °C to +185 °C operating range - critical for under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA; defines safe DC rail margin for 36 V nominal systems. |
| VBR (min/typ/max) | 36.7 / 38.7 / 40.6 V at 1.0 mA - precise breakdown threshold ensures reliable turn-on without false triggering. |
| VC @ IPPM | 53.3 V at 56.3 A - clamping voltage limits downstream component stress during 3000 W transient events. |
| PPPM | 3000 W (10/1000 μs) - enables protection against severe ISO 7637-2 Pulse 1/2b/5a surges in automotive ECUs. |
| TJ max | +185 °C - supports placement near high-power components in engine bay or motor drive modules. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.11 mm body length and 3.20 mm minimum cathode band width. |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case meeting UL 94 V-0; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of internal PN junction | Connected to protected circuit's higher-potential node (e.g., +12 V rail); absorbs positive transients toward ground. |
| Anode (non-banded end) | Cathode of internal PN junction | Connected to system ground or low-impedance return path; completes clamping loop during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process reduces leakage drift and improves long-term stability at 150 °C. |
| MSL Level 1 | Rated for reflow up to 260 °C peak - eliminates moisture sensitivity concerns during standard SMT assembly. |
| Low Rsurge | Typical incremental surge resistance < 0.3 Ω - minimizes clamping voltage overshoot during fast-rising transients. |
| RoHS & halogen-free option | HE3 suffix denotes RoHS-compliant construction; HM3 suffix adds halogen-free molding compound. |
| Fast response time | < 1.0 ps intrinsic junction response - ensures clamping activation before sensitive downstream logic or gate drivers are damaged. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive DC Bus |
|---|---|
Use Scenario: Protection of microcontroller power supply and CAN transceiver VCC rails against load dump and alternator ripple. IC Role / Device Role: Unidirectional TVS placed between 12 V input and chassis ground to clamp transients above 33 V. Use Value: Withstands 3000 W pulses while maintaining 53.3 V clamping - prevents latch-up or burnout in 3.3 V/5 V logic powered from regulated 12 V supplies. |
Use Scenario: Safeguarding IGBT gate driver ICs and bootstrap capacitors from inductive kickback during PWM switching. IC Role / Device Role: Mounted across DC bus (e.g., 48 V or 72 V) to suppress commutation spikes before they reach gate drive circuitry. Use Value: 185 °C rating allows direct placement near heat-generating power stages; 56.3 A surge current capacity handles repetitive motor stall events. |
| Telecom Power Supply Input | Consumer Appliance Main Board |
Use Scenario: Input-stage protection for AC/DC front-end converters exposed to lightning-induced surges on PoE or AC mains inputs. IC Role / Device Role: First-line defense in series with fuse and common-mode choke; shunts differential-mode surges to ground. Use Value: 3000 W rating meets IEC 61000-4-5 Level 4 requirements; DO-214AB footprint enables compact layout with minimal trace inductance. |
Use Scenario: Protecting MCU reset lines and communication interfaces (UART, I²C) from ESD and relay coil back-EMF in washing machine control boards. IC Role / Device Role: Localized TVS on 3.3 V or 5 V signal rails adjacent to connectors and electromechanical switches. Use Value: Low 1.0 μA leakage at 33 V preserves battery life in standby mode; AEC-Q101 qualification ensures field reliability beyond consumer-grade expectations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5A (Vishay) | Lower PPPM (400 W), smaller SMA package, same VWM/VBR range but reduced surge current (11.8 A). | Suitable only for low-energy signal-line protection; insufficient for power rail clamping in automotive or motor drives. | Select when board space is constrained and surge energy is limited to < 100 mJ. |
| SMCJ33A (Littelfuse) | Identical SMC package, 3000 W rating, but VC = 53.3 V at 56.3 A - matches 3KASMC33AHE3_B/H clamping performance. | Same AEC-Q101 qualification and thermal specs; differs only in marking and tape/reel packaging configuration. | Drop-in alternative where dual-sourcing or distributor availability favors Littelfuse logistics. |
Compared with SMAJ33A-E3/5A and SMCJ33A, the 3KASMC33AHE3_B/H offers identical clamping performance to SMCJ33A but with Vishay's proprietary passivated junction for enhanced high-temperature leakage stability - making it preferred for extended-life automotive modules operating continuously at >125 °C ambient.
Availability
3KASMC33AHE3_B/H is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, telecom power supplies, and consumer appliance main boards requiring stable component supply with AEC-Q101 compliance and high-temperature reliability.
Supply support for 3KASMC33AHE3_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 is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMCxxA family was engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment power electronics - emphasizing thermal robustness, surge consistency, and solder-reflow resilience over cost-optimized consumer-grade alternatives.
FAQ
What is the exact stand-off voltage (VWM) of the 3KASMC33AHE3_B/H?
The 3KASMC33AHE3_B/H has a nominal stand-off voltage VWM of 33 V, meaning it remains in high-impedance blocking state for reverse voltages ≤33 V while exhibiting ≤1.0 μA leakage current at 25 °C. This value is guaranteed across the full operating temperature range and aligns with its designation as a "33A" variant in the 3KASMCxxA series.
Is the 3KASMC33AHE3_B/H qualified for automotive applications?
Yes, the 3KASMC33AHE3_B/H is AEC-Q101 qualified, as confirmed by Vishay's documentation (Document Number 88480, Revision 19-Jan-2024). Its qualification covers temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge testing - validating suitability for under-hood and transmission-control module deployments.
What does the "HE3_B/H" suffix indicate in 3KASMC33AHE3_B/H?
The "HE3" suffix denotes RoHS-compliant construction with matte tin-plated leads; "B/H" specifies packaging in 7-inch diameter plastic tape and reel with 850 units per reel. This ordering code also confirms MSL Level 1 rating and compliance with JESD 201 Class 2 whisker testing requirements.
How does the 3KASMC33AHE3_B/H compare to the 3KASMC33AHM3_B/H variant?
The 3KASMC33AHE3_B/H and 3KASMC33AHM3_B/H share identical electrical and thermal specifications, including VWM, VBR, PPPM, and AEC-Q101 qualification. The sole difference is that HM3 uses halogen-free molding compound, whereas HE3 is RoHS-compliant but not halogen-free - both meet UL 94 V-0 flammability standards.
What is the maximum clamping voltage (VC) of the 3KASMC33AHE3_B/H under surge conditions?
The 3KASMC33AHE3_B/H clamps to a maximum of 53.3 V when subjected to its rated peak pulse current of 56.3 A (10/1000 μs waveform), as specified in Vishay's Electrical Characteristics table. This clamping voltage is measured at TA = 25 °C and remains stable across temperature due to its +0.091 %/°C VBR coefficient.
3KASMC33AHE3_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 (SMC)
3KASMC33AHE3_B/H FAQ
1.How can I place an order for 3KASMC33AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC33AHE3_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 3KASMC33AHE3_B/H reliable?
The price and inventory of 3KASMC33AHE3_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 3KASMC33AHE3_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC33AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC33AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC33AHE3_B/H?
3KASMC33AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC33AHE3_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 3KASMC33AHE3_B/H?
For technical support, including 3KASMC33AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC33AHE3_B/H requirements.
6.How does Aetrix verify that 3KASMC33AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC33AHE3_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 3KASMC33AHE3_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC33AHE3_B/H?
All 3KASMC33AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC33AHE3_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 3KASMC33AHE3_B/H part is unused and in its original packaging.
Return procedure for 3KASMC33AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC33AHE3_B/H Tags
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