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Vishay General Semiconductor - Diodes Division 3KASMC40AHE3_A/H
- Part No.:
- 3KASMC40AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC40AHE3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,829
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Product details
Overview
3KASMC40AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount 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 rail and sensor line protection.
For engineers reviewing the 3KASMC40AHE3_A/H datasheet, 3KASMC40AHE3_A/H pinout, 3KASMC40AHE3_A/H application, or 3KASMC40AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 185 °C junction rating, low clamping ratio (VC/VBR ≈ 1.33), and MSL Level 1 reflow compatibility at 260 °C peak.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under high-temperature operation up to TJ = 185 °C, with thermal resistance RθJA = 77.5 °C/W and RθJL = 18.3 °C/W. It delivers 3000 W peak pulse power per 10/1000 µs waveform while maintaining low incremental surge resistance and fast response time.
Designed exclusively for unidirectional operation, it features a color-band cathode marking, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets UL 94 V-0 flammability requirements in its DO-214AB molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum reverse operating voltage before clamping begins; defines safe working range on protected line |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - ensures predictable turn-on threshold across production lot and temperature |
| VC @ IPPM | 64.5 V - clamping voltage during 46.5 A surge; limits downstream IC stress to safe levels |
| PPPM | 3000 W - peak pulse power handling capability with 10/1000 µs waveform; suitable for ISO 7637-2 pulse 5a/b |
| TJ max. | +185 °C - enables use in under-hood automotive environments without derating penalties |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
| Package | DO-214AB (SMC) - industry-standard SMT outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
DO-214AB (SMC) package: two-terminal surface-mount device with cathode indicated by color band; terminals are matte tin-plated leads compatible with standard reflow profiles (MSL Level 1, peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input reference node for unidirectional clamping | Connected to protected line's ground or low-side return path; forms forward-biased path during negative transients |
| Cathode | Clamping output node | Connected to protected line (e.g., 12 V rail); conducts surge current to ground when voltage exceeds VBR |
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 allows placement near hot components (e.g., power MOSFETs, DC/DC converters) without derating |
| Low clamping ratio | VC/VBR ≈ 1.33 minimizes overvoltage exposure to downstream ICs during surge events |
| Automotive qualification | AEC-Q101 compliance covers HTGB, HTRB, TCT, and ESD testing per stress test plan |
| Robust surge handling | 200 A IFSM (8.3 ms half-sine) supports repeated load-dump and inductive switching events |
Applications
| Automotive Power Rail Protection | Engine Control Unit (ECU) Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs against ISO 7637-2 pulse 5a (load dump) and pulse 1 (inductive switch-off). IC Role / Device Role / Timing Role: Unidirectional TVS clamps transient overvoltage to ≤64.5 V within nanoseconds, preventing damage to LDOs and MCU VDD pins. Use Value: Enables compliance with automotive EMC standards while eliminating need for external series impedance or additional filtering stages. |
Use Scenario: Safeguarding analog sensor signal lines (e.g., MAP, TPS, O2) connected to ECU ADC inputs from coupled transients. IC Role / Device Role / Timing Role: Fast-response TVS shunts ESD and switching noise away from precision front-end circuitry before propagation. Use Value: Maintains signal integrity below 100 pF junction capacitance and avoids ADC offset drift caused by leakage at elevated temperature. |
| Industrial Motor Drive Control Board | Telecom Power Supply Input Stage |
Use Scenario: Suppressing commutation spikes on gate driver supply rails in BLDC inverters operating up to 10 kHz PWM frequency. IC Role / Device Role / Timing Role: TVS absorbs repetitive 3000 W surges induced by IGBT/MOSFET switching, limiting rail overshoot to <65 V. Use Value: Extends lifetime of isolated gate drivers and reduces need for oversized bulk capacitors to absorb energy. |
Use Scenario: Front-end protection of AC/DC and DC/DC converter inputs subjected to lightning-induced surges per IEC 61000-4-5 (Level 3). IC Role / Device Role / Timing Role: Primary clamping element in multi-stage protection scheme, absorbing initial 10/1000 µs surge energy before MOV/GDT activation. Use Value: Provides precise voltage clamping with minimal let-through energy, reducing stress on downstream varistors and fuses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Same DO-214AC (SMA) package; lower PPPM (400 W), higher VC (64.8 V), same VWM/VBR range | Limited to lower-energy transients; not AEC-Q101 qualified; unsuitable for automotive under-hood use | Select when cost sensitivity outweighs surge robustness and automotive qualification requirements |
| SMCJ40A | Same DO-214AB (SMC) package; identical VWM/VBR/VC specs; 3000 W PPPM; AEC-Q101 qualified | Functionally identical clamping performance but lacks HM3 suffix indicating JESD 201 Class 2 whisker resistance | Prefer 3KASMC40AHE3_A/H where long-term lead finish reliability under thermal cycling is critical |
Compared with SMAJ40A and SMCJ40A, the 3KASMC40AHE3_A/H offers superior high-temperature stability (185 °C vs. 150 °C), mandatory AEC-Q101 validation, and JESD 201 Class 2 whisker resistance - making it the only choice for mission-critical automotive power domains requiring zero field failures.
Availability
3KASMC40AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial motor control, telecom power systems, and sensor interface circuits requiring stable component supply across extended temperature and lifecycle demands.
Supply support for 3KASMC40AHE3_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 reliability, power efficiency, and automotive-grade qualification.
The 3KASMC series was engineered specifically for high-reliability automotive and industrial transient suppression, targeting under-hood environments where junction temperatures exceed 150 °C and AEC-Q101 validation is mandatory.
FAQ
What is the clamping voltage of the 3KASMC40AHE3_A/H at its rated peak pulse current?
The 3KASMC40AHE3_A/H has a maximum clamping voltage (VC) of 64.5 V at its peak pulse current (IPPM) of 46.5 A, measured using the standardized 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures downstream ICs remain within safe absolute maximum ratings during surge events. The 3KASMC40AHE3_A/H achieves this with low dynamic impedance and stable junction characteristics.
Is the 3KASMC40AHE3_A/H suitable for automotive under-hood applications?
Yes, the 3KASMC40AHE3_A/H is explicitly qualified to AEC-Q101 and rated for continuous operation up to TJ = +185 °C, making it suitable for under-hood automotive applications such as engine control units, transmission control modules, and body control modules. Its DO-214AB package, matte tin plating, and JESD 201 Class 2 whisker resistance further support long-term reliability in thermally aggressive environments.
What does the "_A/H" suffix indicate in 3KASMC40AHE3_A/H?
The "_A/H" suffix in 3KASMC40AHE3_A/H denotes the packaging configuration: "H" specifies 7-inch plastic tape-and-reel delivery with 850 units per reel, while "A" indicates the base P/NHM3 revision level compliant with RoHS and AEC-Q101. The "E3" portion confirms matte tin plating per JESD 22-B102. This full suffix identifies a production-ready, automotive-qualified variant of the 3KASMC40AHE3_A/H.
How does the 3KASMC40AHE3_A/H compare to standard SMAJ or SMCJ series TVS diodes?
The 3KASMC40AHE3_A/H provides identical electrical specs to SMCJ40A (same VWM, VBR, VC, PPPM) but adds JESD 201 Class 2 whisker resistance and tighter process control for automotive use. Unlike SMAJ40A, it offers 3000 W PPPM (vs. 400 W) and AEC-Q101 qualification. The 3KASMC40AHE3_A/H is not a drop-in replacement for SMAJ40A due to different package (DO-214AB vs. DO-214AC) and performance class.
What is the maximum reverse leakage current of the 3KASMC40AHE3_A/H at 40 V and 150 °C?
The 3KASMC40AHE3_A/H exhibits a maximum reverse leakage current (ID) of 20 µA at VWM = 40 V and TJ = 150 °C, as specified in the Vishay datasheet (Document Number: 89962). This elevated-temperature leakage value remains well below typical comparator or microcontroller input thresholds, ensuring no false triggering or bias shift in high-temperature sensor interfaces.
3KASMC40AHE3_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):
- 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_A/H FAQ
1.How can I place an order for 3KASMC40AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC40AHE3_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 3KASMC40AHE3_A/H reliable?
The price and inventory of 3KASMC40AHE3_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 3KASMC40AHE3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC40AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC40AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC40AHE3_A/H?
3KASMC40AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC40AHE3_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 3KASMC40AHE3_A/H?
For technical support, including 3KASMC40AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC40AHE3_A/H requirements.
6.How does Aetrix verify that 3KASMC40AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC40AHE3_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 3KASMC40AHE3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC40AHE3_A/H?
All 3KASMC40AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC40AHE3_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 3KASMC40AHE3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC40AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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