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Vishay General Semiconductor - Diodes Division 3KASMC40AHE3/57T
- Part No.:
- 3KASMC40AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC40AHE3/57T.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,723
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Product details
Overview
3KASMC40AHE3/57T from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 40 V stand-off voltage, 44.4–49.1 V breakdown at 1 mA, 3000 W peak pulse power (10/1000 µs), 46.5 A peak surge current, and 64.5 V clamping voltage at IPPM - deployed for automotive power line and sensor interface protection.
For engineers reviewing the 3KASMC40AHE3/57T datasheet, 3KASMC40AHE3/57T pinout, 3KASMC40AHE3/57T application, or 3KASMC40AHE3/57T equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, TJ = 185 °C operation, MSL Level 1 rating, and DO-214AB thermal performance with RθJA = 77.5 °C/W.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for junction stability under high-temperature transients. It delivers 3000 W peak pulse power handling with low incremental surge resistance and fast response time to suppress inductive switching spikes and lightning-induced surges on automotive power rails.
Designed for unidirectional clamping only, it operates across -65 °C to +185 °C junction temperature range, meets J-STD-020 MSL Level 1 (260 °C reflow peak), and is qualified per AEC-Q101 for automotive under-hood applications requiring robust transient immunity without polarity reversal capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 44.4 V / 49.1 V at IT = 1 mA - guaranteed breakdown threshold for reliable turn-on margin |
| PPPM | 3000 W (10/1000 µs) - surge energy absorption capacity for automotive load-dump and ISO 7637-2 pulses |
| VC @ IPPM | 64.5 V - clamped voltage during 46.5 A surge, defining protected circuit's maximum overvoltage exposure |
| TJ max | +185 °C - enables under-hood deployment without derating in high-ambient engine compartments |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 0.320" body length and 77.5 °C/W RθJA |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, cathode indicated by color band; terminals are anode and cathode - no internal circuitry or multi-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input reference node for unidirectional clamping | Connected to protected line (e.g., battery rail); conducts during forward surge events |
| Cathode | Clamping output node | Connected to ground or lower-potential return path; defines clamping voltage VC relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and leakage over lifetime and temperature |
| High-temperature operation | TJ = 185 °C rating supports placement near heat sources in automotive ECUs and ADAS modules |
| Peak pulse power | 3000 W (10/1000 µs) handles ISO 7637-2 Pulse 5a/b load-dump transients without failure |
| Low clamping ratio | VC/VBR ≈ 1.35 - tight voltage control minimizes stress on downstream MOSFETs and ICs |
| MSL Level 1 | Compatible with standard SMT reflow profiles up to 260 °C peak, eliminating moisture sensitivity concerns |
Applications
| Automotive Power Rail Protection | Engine Control Unit (ECU) Input Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (ISO 7637-2 Pulse 5) on 12 V battery-fed circuits in vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and ECU input stage. Use Value: Limits voltage to ≤64.5 V during 3000 W surges, preventing damage to 40 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Protects analog sensor inputs and CAN transceiver power pins from inductive kickback in engine bays. IC Role / Device Role / Timing Role: Standoff-clamp device mounted at ECU board edge, shunting surge energy to chassis ground. Use Value: Maintains signal integrity by clamping within 1 ns while sustaining 185 °C junction temperature during prolonged hot-soak conditions. |
| Industrial Motor Drive I/O Protection | Telecom Power Supply Surge Suppression |
Use Scenario: Shields PLC digital I/O lines connected to solenoids and contactors from switching transients. IC Role / Device Role / Timing Role: Primary transient suppressor on 24 V DC control bus feeding field devices. Use Value: Withstands repetitive 46.5 A surges at 40 V standoff, enabling >100,000-cycle reliability per IEC 61000-4-5 Level 4 compliance. |
Use Scenario: Guards AC/DC front-end rectifiers and PFC stages against lightning-induced surges on telecom base station power inputs. IC Role / Device Role / Timing Role: Secondary-level TVS in parallel with MOVs to clamp residual high-frequency overshoot. Use Value: Delivers precise 64.5 V clamping with <1 nA leakage at 40 V, minimizing standby power loss in always-on systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Lower PPPM (400 W), higher RθJA (100 °C/W), same DO-214AC (SMA) package | Not AEC-Q101 qualified; limited to commercial/industrial use below 150 °C | Select when cost sensitivity outweighs automotive qualification and surge margin requirements |
| SMCJ40A | Same DO-214AB (SMC) package and 3000 W rating, but VBR = 44.4–49.1 V and VC = 64.5 V identical; RoHS-compliant but not AEC-Q101 marked | Lacks formal AEC-Q101 certification documentation; may require additional qualification for automotive programs | Choose if AEC-Q101 test reports are not contractually mandated and supply chain favors SMCJ-series inventory |
Compared with SMAJ40A and SMCJ40A, the 3KASMC40AHE3/57T provides verified AEC-Q101 qualification, 185 °C junction rating, and MSL Level 1 compatibility - making it the only option among the three qualified for under-hood automotive deployment without design revalidation.
Availability
3KASMC40AHE3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, engine control unit (ECU) input safeguarding, and industrial motor drive I/O conditioning requiring stable component supply and long-term lifecycle assurance.
Supply support for 3KASMC40AHE3/57T 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-temperature, and automotive-grade performance.
The 3KASMC40AHE3/57T belongs to Vishay's PAR® family of surface-mount TVS diodes engineered specifically for AEC-Q101-compliant automotive transient suppression where thermal stability and surge robustness are critical.
FAQ
What is the clamping voltage of the 3KASMC40AHE3/57T at its rated peak pulse current?
The 3KASMC40AHE3/57T has a maximum clamping voltage (VC) of 64.5 V when subjected to its peak pulse current (IPPM) of 46.5 A using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The 3KASMC40AHE3/57T maintains this clamping performance across its full operating temperature range.
Is the 3KASMC40AHE3/57T qualified for automotive applications?
Yes, the 3KASMC40AHE3/57T is officially AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias, temperature cycling, and accelerated life testing required for automotive under-hood use. Its 185 °C maximum junction temperature and MSL Level 1 rating further support deployment in engine control units and ADAS modules. The 3KASMC40AHE3/57T carries Vishay's AEC-Q101 certification documentation per test plan rev. D.
What does the "HE3/57T" suffix indicate in 3KASMC40AHE3/57T?
The "HE3/57T" suffix denotes Vishay's packaging and reel configuration: "HE3" identifies the base part variant with HM3 plating (RoHS-compliant, whisker-tested), while "57T" specifies 7-inch diameter plastic tape-and-reel packaging containing 850 units. This matches the ordering code format shown in Vishay's Document 89962, confirming the 3KASMC40AHE3/57T is supplied in standard SMT-compatible format with full traceability.
Can the 3KASMC40AHE3/57T be used in bidirectional configurations?
No, the 3KASMC40AHE3/57T is unidirectional only, as explicitly stated in its datasheet features and electrical characteristics table. It clamps only in reverse-bias mode and conducts forward current up to 200 A (IFSM), but lacks symmetrical breakdown behavior. For bidirectional protection, a separate pair of unidirectional devices or a dedicated bidirectional TVS such as SMBJ40CA must be used. The 3KASMC40AHE3/57T polarity is marked by a cathode band on the DO-214AB body.
What is the thermal resistance of the 3KASMC40AHE3/57T in typical PCB mounting?
The 3KASMC40AHE3/57T 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 Figure 6. This value assumes standard FR-4 PCB with copper area matching the DO-214AB footprint; actual RθJA will improve with enhanced copper pour or thermal vias. The 3KASMC40AHE3/57T also exhibits RθJL = 18.3 °C/W junction-to-leads, supporting conduction cooling via PCB traces.
3KASMC40AHE3/57T 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 46.5A
- 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)
3KASMC40AHE3/57T FAQ
1.How can I place an order for 3KASMC40AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC40AHE3/57T 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 3KASMC40AHE3/57T reliable?
The price and inventory of 3KASMC40AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC40AHE3/57T is usually 5 days.
3.What payment methods are accepted for 3KASMC40AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC40AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC40AHE3/57T?
3KASMC40AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC40AHE3/57T 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 3KASMC40AHE3/57T?
For technical support, including 3KASMC40AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC40AHE3/57T requirements.
6.How does Aetrix verify that 3KASMC40AHE3/57T is sourced from the original manufacturer or authorized distributors?
All 3KASMC40AHE3/57T 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 3KASMC40AHE3/57T meets industry standards.
7.What is the process for return or replacement of 3KASMC40AHE3/57T?
All 3KASMC40AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC40AHE3/57T, 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 3KASMC40AHE3/57T part is unused and in its original packaging.
Return procedure for 3KASMC40AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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