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Vishay General Semiconductor - Diodes Division 3KASMC40AHE3_B/I
- Part No.:
- 3KASMC40AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC40AHE3_B/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,074
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Product details
Overview
3KASMC40AHE3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 40 V stand-off voltage, 46.5 A peak pulse current (10/1000 μs), 64.5 V clamping voltage at IPPM, 3000 W peak pulse power, and 185 °C maximum junction temperature - deployed for automotive power rail and sensor line protection against inductive switching transients.
For engineers reviewing the 3KASMC40AHE3_B/I datasheet, 3KASMC40AHE3_B/I pinout, 3KASMC40AHE3_B/I application, or 3KASMC40AHE3_B/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, MSL Level 1 rating, 10/1000 μs waveform capability, and thermal stability up to TJ = 185 °C in high-reliability automotive and industrial environments.
Technical Context
This TVS diode operates as a clamping-type overvoltage protector with avalanche breakdown behavior, optimized for fast response (<1 ns) and low incremental surge resistance. Its passivated anisotropic rectifier structure ensures stable VBR drift (αT = 0.092 %/°C) and robust performance under repeated surge stress.
Designed for high-temperature reliability, it supports continuous operation from –65 °C to +185 °C junction temperature and meets JESD201 Class 2 whisker resistance. The device is RoHS-compliant, halogen-free optional (HM3 suffix), and qualified per AEC-Q101 for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum reverse working voltage before clamping begins; defines safe operating margin for 36 V nominal automotive systems. |
| VBR (min/typ/max) | 44.4 / 46.8 / 49.1 V at 1 mA - Confirmed avalanche breakdown threshold; enables precise overvoltage trip point selection. |
| VC @ IPPM | 64.5 V - Clamping voltage at 46.5 A peak pulse; limits downstream IC stress during 3000 W transient events. |
| PPPM | 3000 W - Peak pulse power handling with 10/1000 μs waveform; meets ISO 7637-2 Pulse 5a/b severity levels. |
| TJ max. | +185 °C - Enables placement near hot components (e.g., power MOSFETs, DC/DC converters) without derating. |
| Polarity | Unidirectional - Protects only against positive transients on anode-to-cathode bias; requires correct orientation in series with protected line. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.06 mm lead spacing; compatible with automated pick-and-place. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry path during positive overvoltage event | Connected to protected line (e.g., battery rail, sensor output); conducts surge current into cathode when VAK exceeds VBR. |
| Cathode | Transient current return path and reference node | Typically tied to ground or low-impedance return; establishes clamping reference and completes surge current loop. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Reduces leakage drift and improves long-term stability under thermal cycling and humidity exposure. |
| AEC-Q101 qualification (HE3 suffix) | Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per JEDEC standards. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow assembly without moisture-induced popcorn failure risk. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., load dump, relay bounce). |
| 185 °C junction temperature rating | Supports under-hood deployment in engine control units and ADAS modules without thermal derating. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppresses load dump transients (ISO 7637-2 Pulse 5a, up to 60 V/100 ms) on 12 V battery-fed ECUs in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Clamping-type transient suppressor placed between battery input and upstream DC/DC converter or LDO regulator. Use Value: Limits peak voltage seen by downstream regulators to ≤64.5 V, preventing latch-up or permanent damage during alternator field collapse events. | Use Scenario: Shields analog front-end circuits (e.g., pressure, temperature, position sensors) from ESD and inductive kickback in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional TVS connected in series with sensor signal line and grounded cathode, providing sub-1 ns response to ±8 kV HBM ESD. Use Value: Maintains signal integrity below 100 pF capacitance while clamping transients to <65 V, avoiding ADC saturation or op-amp input stage damage. |
| Telecom Power Supply Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Guards AC/DC adapter inputs and PoE-powered equipment against lightning-induced surges (IEC 61000-4-5, 1.2/50 μs + 8/20 μs combo wave). IC Role / Device Role / Timing Role: Primary-level TVS on DC input bus of telecom base station power supplies, coordinated with MOVs and GDTs. Use Value: Absorbs 3000 W surge energy without degradation, enabling compliance with EN 61000-4-5 Level 4 immunity requirements. | Use Scenario: Protects microcontroller GPIOs and gate drivers from back-EMF spikes generated by brushed DC motors in smart home appliances (e.g., washing machines, HVAC blowers). IC Role / Device Role / Timing Role: Local TVS mounted adjacent to motor terminals or driver IC outputs, with cathode tied to local ground plane. Use Value: Clamps 46.5 A surge currents within 10/1000 μs envelope, eliminating false resets and MOSFET shoot-through caused by >50 V ringing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/5AT | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR range but higher VC (64.8 V), non-AEC-Q101 | Not qualified for automotive under-hood use; limited to consumer/industrial board-level protection where space is constrained | Select when cost sensitivity outweighs automotive qualification and surge energy demands are ≤400 W |
| 1.5KE40A | Through-hole DO-201 package, 1500 W PPPM, higher VF (3.5 V), no MSL rating, non-AEC-Q101 | Requires manual or wave soldering; unsuitable for high-volume SMT lines or thermally demanding environments | Choose only for legacy through-hole designs or prototyping where reflow compatibility and AEC-Q101 are not required |
Compared with SMAJ40A-E3/5AT and 1.5KE40A, the 3KASMC40AHE3_B/I delivers 7.5× higher surge power handling, AEC-Q101 qualification, MSL Level 1 reflow support, and superior thermal endurance - making it the preferred choice for production automotive and high-reliability industrial applications requiring sustained 185 °C operation.
Availability
3KASMC40AHE3_B/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom power supplies, and consumer appliance motor drives requiring stable component supply across multi-year production cycles.
Supply support for 3KASMC40AHE3_B/I 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-grade solutions.
The 3KASMCxxA family was engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive and industrial applications, prioritizing thermal robustness, surge endurance, and process-controlled parametric consistency.
FAQ
What is the clamping voltage of the 3KASMC40AHE3_B/I at its rated peak pulse current?
The 3KASMC40AHE3_B/I has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 46.5 A, measured using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed per the Vishay datasheet revision 19-Jan-2024 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The 3KASMC40AHE3_B/I maintains this clamping performance across its full operating temperature range.
Is the 3KASMC40AHE3_B/I qualified for automotive applications?
Yes, the 3KASMC40AHE3_B/I is AEC-Q101 qualified, as confirmed by Vishay's documentation for the 3KASMCxxA family. The HE3 suffix explicitly denotes RoHS-compliant, AEC-Q101-qualified variants. It undergoes stress testing including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and human-body model (HBM) ESD per JEDEC standards. The 3KASMC40AHE3_B/I is intended for under-hood and chassis-mounted automotive modules.
What does the "B/I" suffix mean in 3KASMC40AHE3_B/I?
The "B/I" suffix in 3KASMC40AHE3_B/I indicates two ordering attributes: "B" is the revision code denoting the specific manufacturing lot or process iteration, and "I" specifies the packaging format - 13-inch diameter plastic tape and reel containing 3500 units. This matches Vishay's official ordering information table, where "I" corresponds to the high-volume reel configuration versus "H" for 7-inch reels (850 units). The 3KASMC40AHE3_B/I is fully interchangeable with other HE3-suffix variants in form, fit, and function.
Can the 3KASMC40AHE3_B/I be used in bidirectional configurations?
No, the 3KASMC40AHE3_B/I is unidirectional only, as stated in the Vishay datasheet features section. It conducts surge current only when the anode is more positive than the cathode and provides clamping protection solely against positive transients. For bidirectional protection (e.g., AC lines or data lines with ± transients), a separate bidirectional TVS such as SMBJ40CA or a back-to-back diode configuration is required. Using the 3KASMC40AHE3_B/I in reverse bias beyond its 40 V stand-off voltage risks permanent breakdown.
What is the thermal resistance junction-to-ambient for the 3KASMC40AHE3_B/I?
The typical thermal resistance junction-to-ambient (RθJA) for the 3KASMC40AHE3_B/I is 77.5 °C/W, measured under standard JEDEC test conditions (single device on FR-4 board with minimum recommended pad layout). This value assumes no heatsinking and reflects natural convection cooling. When mounted on copper pour or with thermal vias, actual RθJA may improve significantly. The 3KASMC40AHE3_B/I also has a junction-to-lead thermal resistance (RθJL) of 18.3 °C/W, supporting efficient heat transfer to PCB traces or metal-core substrates.
3KASMC40AHE3_B/I 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):
- 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 (SMC)
3KASMC40AHE3_B/I FAQ
1.How can I place an order for 3KASMC40AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC40AHE3_B/I 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_B/I reliable?
The price and inventory of 3KASMC40AHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC40AHE3_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC40AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC40AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC40AHE3_B/I?
3KASMC40AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC40AHE3_B/I 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_B/I?
For technical support, including 3KASMC40AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC40AHE3_B/I requirements.
6.How does Aetrix verify that 3KASMC40AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC40AHE3_B/I 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_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC40AHE3_B/I?
All 3KASMC40AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC40AHE3_B/I, 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_B/I part is unused and in its original packaging.
Return procedure for 3KASMC40AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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