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Vishay General Semiconductor - Diodes Division 3KASMC43HE3_A/H
- Part No.:
- 3KASMC43HE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC43HE3_A/H.pdf
- Description:
- TVS DIODE 43VWM 76.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,517
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Product details
Overview
3KASMC43HE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 69.4 V under 43.2 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 3KASMC43HE3_A/H datasheet, 3KASMC43HE3_A/H pinout, 3KASMC43HE3_A/H application, or 3KASMC43HE3_A/H equivalent, key selection criteria include its DO-214AB (SMC) package, unidirectional polarity, 43 V stand-off voltage, AEC-Q101 qualification, and thermal resistance of 77.5 °C/W (junction-to-ambient).
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its 185 °C maximum junction temperature and MSL Level 1 rating (260 °C reflow peak) support automotive under-hood deployment without derating penalties.
The device exhibits fast response time and excellent clamping ratio (VC/VBR ≈ 1.31), with 1.0 mA test current defining breakdown voltage (47.8–52.8 V) and 1.0 µA reverse leakage at 43 V stand-off. It meets ANSI/IEEE C62.35 surge standards and is rated for non-repetitive 8.3 ms half-sine surges up to 200 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 43 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (Breakdown) | 47.8–52.8 V at 1.0 mA - Ensures reliable turn-on margin above system rail |
| VC (Clamping) | 69.4 V at IPPM = 43.2 A - Limits transient voltage seen by protected downstream devices |
| PPPM | 3000 W (10/1000 µs) - Withstands high-energy surges common in automotive load-dump events |
| TJ max. | 185 °C - Enables operation in high-ambient environments like engine compartments |
| RθJA | 77.5 °C/W - Defines thermal performance on standard PCB pad layout per datasheet Fig. 6 |
| AEC-Q101 | Qualified - Validated for automotive electronic systems per stress-test requirements |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, RoHS-compliant, UL 94 V-0 molding compound. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to protected circuit ground or low-side return path |
| Cathode | Current exit point during reverse-biased clamping | Connected to protected line (e.g., 43 V rail); color band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable leakage and long-term reliability at 185 °C |
| Peak pulse power | 3000 W (10/1000 µs) enables single-device protection against ISO 7637-2 Pulse 5a load-dump surges |
| Clamping efficiency | VC/VBR ratio ~1.31 minimizes overvoltage stress on sensitive downstream components |
| Thermal robustness | MSL Level 1 rating and 260 °C peak reflow tolerance support automated SMT assembly |
| Automotive qualification | AEC-Q101 compliance confirms suitability for mission-critical vehicle subsystems |
Applications
| Engine Control Unit (ECU) Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (up to 60 V, 100 ms) induced by alternator disconnection in 12 V automotive systems. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and ECU input filter capacitor. Use Value: Clamps 3KASMC43HE3_A/H at 69.4 V during 43.2 A surge, preventing damage to 45 V-rated DC-DC controllers and microcontrollers. |
Use Scenario: Protects 24 V digital input modules from inductive kickback when solenoids or relays de-energize. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals upstream of optocoupler isolation stage. Use Value: 43 V VWM aligns with 24 V nominal + 20 % tolerance; 3000 W rating handles repetitive 10/1000 µs surges per IEC 61000-4-5. |
| Automotive Body Control Module (BCM) | Telecom Power Supply Input Stage |
Use Scenario: Shields LIN bus transceivers and window motor drivers from battery reverse-polarity and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at BCM main power entry point, adjacent to fuse. Use Value: 185 °C TJ max. allows placement near heat-generating power FETs; AEC-Q101 ensures qualification for body electronics. |
Use Scenario: Guards AC-DC front-end rectifiers and PFC controllers against lightning-induced surges on -48 V telecom supplies. IC Role / Device Role / Timing Role: Primary clamping device on DC output rail before secondary regulation stage. Use Value: 69.4 V clamping voltage provides safe margin below 75 V absolute maximum ratings of telecom-grade MOSFETs and controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | Lower PPPM (400 W), same DO-214AC (SMA) package, 69.4 V clamping at 22.5 A | Not AEC-Q101 qualified; limited to commercial/industrial use | Select when cost sensitivity outweighs automotive qualification and surge energy demands |
| SMCJ43A | Same DO-214AB (SMC) package, 3000 W rating, but 70.1 V clamping at 42.8 A; AEC-Q101 qualified | Higher VC increases protected device stress marginally; identical thermal and mounting behavior | Choose if board-level validation already covers 70.1 V clamping; direct footprint compatibility confirmed |
Compared with SMAJ43A and SMCJ43A, the 3KASMC43HE3_A/H offers identical package and AEC-Q101 qualification as SMCJ43A but with tighter clamping (69.4 V vs. 70.1 V) and lower RθJA (77.5 vs. 80 °C/W), improving thermal headroom in compact automotive layouts.
Availability
3KASMC43HE3_A/H is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply, AEC-Q101 compliance, and high-temperature surge resilience.
Supply support for 3KASMC43HE3_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, MOSFETs, and TVS devices with emphasis on reliability, high-temperature operation, and automotive qualification.
The 3KASMCxxA family was engineered specifically for high-energy transient suppression in harsh automotive and industrial environments, prioritizing 185 °C operation, AEC-Q101 compliance, and robust 3000 W surge handling in the DO-214AB package.
FAQ
What is the clamping voltage of the 3KASMC43HE3_A/H under maximum surge conditions?
The 3KASMC43HE3_A/H clamps at 69.4 V when subjected to its rated peak pulse current of 43.2 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and reflects the maximum voltage imposed on protected circuitry during worst-case transient events, ensuring compatibility with 75 V-rated downstream components.
Is the 3KASMC43HE3_A/H suitable for automotive under-hood applications?
Yes, the 3KASMC43HE3_A/H is AEC-Q101 qualified and rated for 185 °C maximum junction temperature, making it suitable for under-hood automotive applications such as engine control units and body control modules. Its DO-214AB package supports MSL Level 1 reflow and withstands mechanical and thermal stresses typical in vehicle environments.
What does the "_A/H" suffix indicate in the 3KASMC43HE3_A/H part number?
The "_A/H" suffix in 3KASMC43HE3_A/H denotes the packaging configuration: "H" specifies 7-inch diameter plastic tape and reel with 850 units per reel, while "A" indicates the base P/NHM3 variant - RoHS-compliant, AEC-Q101 qualified, and meeting JESD 201 Class 2 whisker resistance requirements.
How does the thermal resistance of the 3KASMC43HE3_A/H affect PCB layout?
The 3KASMC43HE3_A/H has a typical RθJA of 77.5 °C/W when mounted on the minimum recommended pad layout per datasheet Figure 6. To maintain TJ ≤ 185 °C, designers must ensure adequate copper area and avoid excessive ambient heating; doubling pad size typically reduces RθJA by ~15 %, directly impacting sustained power handling.
Can the 3KASMC43HE3_A/H replace older SMCJ43A devices on existing PCBs?
Yes, the 3KASMC43HE3_A/H uses the same DO-214AB (SMC) package as SMCJ43A and shares identical mechanical dimensions and solder pad requirements. Its 69.4 V clamping voltage is slightly lower than SMCJ43A's 70.1 V, offering marginally improved protection without requiring layout changes or requalification.
3KASMC43HE3_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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 39.1A
- 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)
3KASMC43HE3_A/H FAQ
1.How can I place an order for 3KASMC43HE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC43HE3_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 3KASMC43HE3_A/H reliable?
The price and inventory of 3KASMC43HE3_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 3KASMC43HE3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC43HE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC43HE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC43HE3_A/H?
3KASMC43HE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC43HE3_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 3KASMC43HE3_A/H?
For technical support, including 3KASMC43HE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC43HE3_A/H requirements.
6.How does Aetrix verify that 3KASMC43HE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC43HE3_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 3KASMC43HE3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC43HE3_A/H?
All 3KASMC43HE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC43HE3_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 3KASMC43HE3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC43HE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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