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Vishay General Semiconductor - Diodes Division 3KASMC33AHE3_A/H
- Part No.:
- 3KASMC33AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC33AHE3_A/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
3KASMC33AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount 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 qualified to AEC-Q101 for automotive electronics protection.
For engineers reviewing the 3KASMC33AHE3_A/H datasheet, 3KASMC33AHE3_A/H pinout, 3KASMC33AHE3_A/H application, or 3KASMC33AHE3_A/H equivalent, this page delivers verified electrical specs, thermal performance, mechanical dimensions, and automotive-grade reliability context - critical for ESD/surge protection design in power rails and signal lines.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology with junction passivation optimized for high-temperature stability up to TJ = 185 °C and meets MSL Level 1 per J-STD-020 (260 °C peak reflow). It operates exclusively in unidirectional polarity, with cathode indicated by a color band.
Its clamping behavior is characterized by low incremental surge resistance and fast response time, enabling effective suppression of transients induced by inductive load switching or lightning surges on sensitive ICs and MOSFETs. The device is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits 77.5 °C/W typical junction-to-ambient thermal resistance on standard PCB pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - maximum continuous reverse voltage before clamping begins; defines safe operating margin below breakdown |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - precise voltage threshold where avalanche conduction initiates under controlled test conditions |
| VC (Clamping Voltage) | 53.3 V at IPPM = 56.3 A - maximum voltage seen across device during 3000 W transient, directly limiting stress on protected circuitry |
| PPPM (Peak Pulse Power) | 3000 W (10/1000 µs waveform) - surge energy handling capacity defining protection level against standardized lightning/inductive spikes |
| TJ max. | 185 °C - enables operation in under-hood automotive environments and high-power industrial enclosures without derating |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock per JEDEC standards |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.90 mm height, compatible with automated assembly |
Pinout & Package
Package: DO-214AB (SMC), molded plastic case meeting UL 94 V-0 flammability rating; matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode denoted by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side connection | Connected to ground or lower-potential rail in unidirectional TVS configuration; forms return path during clamping |
| Cathode | Reverse-biased terminal / protected line connection | Connected to the line being protected (e.g., 33 V supply rail); avalanche conduction occurs when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage performance and long-term reliability at TJ = 185 °C, critical for automotive under-hood deployment |
| 3000 W peak pulse power (10/1000 µs) | Provides robust immunity against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 transients in 12 V/24 V systems |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot during surge events, reducing risk of damage to downstream logic and analog components |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning, simplifying manufacturing integration |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-failure field performance |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 33 V battery-supplied ECUs against load dump and alternator transients in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges above 33 V while maintaining normal operation below VWM. Use Value: Limits peak voltage to 53.3 V during 3000 W transients, preventing damage to 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC I/O modules exposed to motor drive noise. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt fast-rising EFT bursts (IEC 61000-4-4) before reaching ADC front-end. Use Value: Fast response and low clamping voltage preserve signal integrity and prevent latch-up in precision 24-bit sigma-delta ADCs. |
| Telecom Power Supply Input | Consumer Device USB Power Path |
Use Scenario: Secondary-side overvoltage protection on 33 V telecom rectifier outputs feeding base station RF amplifiers. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing coupled lightning surges (IEC 61000-4-5) entering via AC mains or Ethernet ports. Use Value: 185 °C junction rating ensures uninterrupted operation in sealed outdoor cabinets with ambient temperatures up to 85 °C. |
Use Scenario: Input-stage surge protection for portable medical monitors powered via USB-C PD (33 V PPS mode). IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line to suppress hot-plug transients and ESD events per IEC 61000-4-2 Level 4. Use Value: Meets AEC-Q101 stress requirements despite non-automotive use, ensuring >10-year field reliability in clinical 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 |
|---|---|---|---|
| SMAJ33A-E3/57T (Vishay) | Same DO-214AC (SMA) package; lower PPPM = 400 W; VBR = 36.7–40.6 V; VC = 53.3 V at 7.5 A | Targeted at cost-sensitive consumer electronics with lower surge threat levels; not AEC-Q101 qualified | Select when board space allows larger SMC footprint and automotive qualification is mandatory for 3KASMC33AHE3_A/H |
| 1.5KE33A (ON Semiconductor) | Through-hole DO-201AE package; same VWM/VBR/VC specs; PPPM = 1500 W; TJ max = 175 °C; no AEC-Q101 | Suitable for prototyping or legacy through-hole designs; lacks high-temp capability and automotive validation | Choose only if existing through-hole layout prohibits SMT migration; verify thermal relief pad design for 3000 W dissipation |
Compared with SMAJ33A-E3/57T and 1.5KE33A, the 3KASMC33AHE3_A/H delivers triple the surge power handling, full automotive qualification, and extended junction temperature range - making it the sole option for production-grade 12 V/24 V/33 V automotive and industrial systems demanding ISO 16750-2 compliance.
Availability
3KASMC33AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom rectifiers, and medical power supplies requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for 3KASMC33AHE3_A/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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on high-reliability, high-temperature, and automotive-qualified solutions.
The 3KASMC series was engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive and industrial applications, emphasizing thermal robustness, surge immunity, and process-controlled consistency across production lots.
FAQ
What is the clamping voltage of the 3KASMC33AHE3_A/H under maximum surge conditions?
The 3KASMC33AHE3_A/H has a maximum clamping voltage (VC) of 53.3 V at 56.3 A peak pulse current (IPPM), measured using the standard 10/1000 µs waveform. This value is specified in the Electrical Characteristics table of Vishay document 89962 and represents the upper voltage limit imposed on protected circuitry during a 3000 W transient event. The 3KASMC33AHE3_A/H maintains this clamping performance across its full operating temperature range.
Is the 3KASMC33AHE3_A/H suitable for automotive applications?
Yes, the 3KASMC33AHE3_A/H is AEC-Q101 qualified and rated for TJ = 185 °C, making it suitable for under-hood automotive applications including engine control units, body control modules, and ADAS power supplies. Its DO-214AB (SMC) package supports automated assembly, and its 3000 W surge rating meets ISO 7637-2 and ISO 16750-2 requirements. The 3KASMC33AHE3_A/H is explicitly listed in Vishay's AEC-Q101 qualified product matrix.
What does the "_A/H" suffix mean in 3KASMC33AHE3_A/H?
The "_A/H" suffix in 3KASMC33AHE3_A/H indicates packaging: "H" denotes 7-inch diameter plastic tape and reel with 850 units per reel, per Vishay's Ordering Information table (document 89962, page 3). The "A" denotes revision level A of the HM3 base part, confirming RoHS compliance and AEC-Q101 qualification. The "E3" denotes matte tin plating per JESD 22-B102. The 3KASMC33AHE3_A/H is not a variant with altered electrical specs - all parameters match the base 3KASMC33A device.
How does the thermal resistance of the 3KASMC33AHE3_A/H affect PCB layout?
The 3KASMC33AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W when mounted on the minimum recommended pad layout per Vishay's datasheet. To maintain TJ ≤ 185 °C during repeated surges, designers must ensure adequate copper area and thermal vias beneath the cathode/anode pads. The 3KASMC33AHE3_A/H thermal performance is optimized for the DO-214AB footprint shown on page 4 - deviating from this layout increases RθJA and risks thermal runaway during high-duty-cycle transients.
Does the 3KASMC33AHE3_A/H have bidirectional capability?
No, the 3KASMC33AHE3_A/H is unidirectional only, as confirmed in the Features section of Vishay document 89962 ("Available in uni-directional polarity only"). It conducts in forward bias like a standard diode and clamps reverse transients above VBR. For bidirectional protection, two 3KASMC33AHE3_A/H devices would need back-to-back configuration, or a dedicated bidirectional TVS such as the SMBJ33CA should be selected instead.
3KASMC33AHE3_A/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:
- 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_A/H FAQ
1.How can I place an order for 3KASMC33AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC33AHE3_A/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_A/H reliable?
The price and inventory of 3KASMC33AHE3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC33AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC33AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC33AHE3_A/H?
3KASMC33AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC33AHE3_A/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_A/H?
For technical support, including 3KASMC33AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC33AHE3_A/H requirements.
6.How does Aetrix verify that 3KASMC33AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC33AHE3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC33AHE3_A/H?
All 3KASMC33AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC33AHE3_A/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_A/H part is unused and in its original packaging.
Return procedure for 3KASMC33AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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