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Vishay General Semiconductor - Diodes Division 3KASMC24AHE3_A/H
- Part No.:
- 3KASMC24AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC24AHE3_A/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,084
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Product details
Overview
3KASMC24AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 38.9 V @ 77.1 A, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and ICs against inductive switching transients in engine control units and battery management systems.
For engineers reviewing the 3KASMC24AHE3_A/H datasheet, 3KASMC24AHE3_A/H pinout, 3KASMC24AHE3_A/H application, or 3KASMC24AHE3_A/H equivalent, key selection criteria include its 24 V stand-off voltage, AEC-Q101 qualification, DO-214AB (SMC) package thermal performance, and verified clamping behavior under repetitive surge stress per JESD22-A114.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional polarity and 185 °C maximum junction temperature support operation in under-hood automotive environments where thermal derating and reliability under sustained bias are critical.
The device meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility and passes JESD201 Class 2 whisker testing. Its 77.5 °C/W junction-to-ambient thermal resistance is measured on minimum recommended pad layout, confirming suitability for compact PCB designs without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin for 24 V system rails. |
| VBR (min/max) | 26.7 V / 29.5 V at 1 mA - Verified breakdown threshold ensures predictable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 38.9 V at 77.1 A - Clamping voltage limits downstream component stress during 3000 W transient surges (10/1000 μs). |
| PPPM | 3000 W - Peak pulse power rating enables protection against severe load-dump and ISO 7637-2 Pulse 5a transients. |
| TJ max. | 185 °C - Enables uninterrupted operation in high-ambient environments such as automotive power modules and industrial motor drives. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 0.320" body length and matte tin-plated leads compliant with J-STD-002 solderability. |
Pinout & Package
DO-214AB (SMC) package: cathode-indicating band on one end; two-terminal axial configuration with no internal circuitry beyond the PN junction. Leads are matte tin-plated and solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; establishes reference for clamping action during positive transients on cathode side. |
| Cathode | Protected line input | Connected to the line being protected (e.g., 24 V supply rail); conducts surge current to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for ECUs and ADAS power stages. |
| Junction passivation | Optimized anisotropic rectifier process reduces leakage drift at 150 °C, ensuring stable VWM over lifetime in harsh thermal environments. |
| MSL Level 1 | Rated for peak reflow temperatures up to 260 °C without moisture-induced damage - eliminates pre-bake requirement for SMT assembly. |
| Low Rsurge | Minimal incremental surge resistance ensures tight clamping window (VC – VBR = 12.2 V max), reducing voltage overshoot on protected ICs. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial 24 V PLC I/O Module |
|---|---|
Use Scenario: Protection of microcontroller power inputs and CAN transceiver VCC rails against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 24 V supply and ground, triggered within <1 ps to limit voltage to ≤38.9 V during 3000 W surges. Use Value: Prevents latch-up and gate oxide damage in 3.3 V/5 V logic supplies by maintaining clamped voltage below MOSFET drain-source breakdown thresholds. |
Use Scenario: Safeguarding digital input optocouplers and relay driver circuits exposed to inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing energy from 200 A 8.3 ms half-sine surges (IFSM) without degradation. Use Value: Extends field service life by eliminating repeatable failure modes caused by cumulative surge stress in factory automation equipment. |
| Telecom Power Supply Front-End | EV Battery Management System (BMS) Cell Monitor Interface |
Use Scenario: Secondary-level surge suppression on +24 V telecom rectifier outputs feeding backplane distribution networks. IC Role / Device Role / Timing Role: Fast-response clamping device with 1 μA leakage at 24 V, minimizing standby power loss while reacting to lightning-induced transients. Use Value: Maintains system uptime by preventing false resets and brownouts during repeated 10/1000 μs surges per ITU-T K.20/21 standards. |
Use Scenario: Protecting isolated analog front-ends measuring cell voltages in 48–800 V EV battery packs against ground bounce and coupling noise. IC Role / Device Role / Timing Role: High-reliability TVS mounted directly at connector entry points, rated for 185 °C ambient to survive proximity to battery cells. Use Value: Ensures functional safety compliance (ISO 26262 ASIL-B) by guaranteeing no single-point fault during surge events across full temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W), smaller SMA package (RθJA = 110 °C/W), same VWM/VC but higher clamping ratio (VC/VBR = 1.45 vs. 1.40). | Not AEC-Q101 qualified; limited to consumer/industrial use where 3000 W surge immunity is not required. | Select when board space is constrained and surge energy is ≤400 W; avoid in automotive power rails. |
| SMCJ24A | Same DO-214AB package and 3000 W rating, but VC = 38.9 V at 77.1 A (identical), TJ max = 175 °C (10 °C lower), and no JESD201 Class 2 whisker test validation. | Lacks AEC-Q101 certification and high-temp reliability data for extended-life automotive deployment. | Acceptable for non-safety-critical industrial use; choose 3KASMC24AHE3_A/H when 185 °C operation or automotive qualification is mandatory. |
Compared with SMAJ24A and SMCJ24A, the 3KASMC24AHE3_A/H provides superior thermal margin (185 °C vs. 150–175 °C), AEC-Q101 validation, and whisker-tested terminations - making it the only option qualified for under-hood automotive electronics requiring zero-failure reliability over 15-year service life.
Availability
3KASMC24AHE3_A/H is available at Aetrix Electronics and suitable for automotive engine control units, industrial 24 V programmable logic controllers, and telecom power supply front-ends requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for 3KASMC24AHE3_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 high-reliability diodes, rectifiers, and protection devices for demanding environments.
The 3KASMC series was engineered specifically for AEC-Q101-compliant automotive power rail protection, emphasizing high-temperature stability, surge endurance, and process-controlled passivation for long-term parametric consistency.
FAQ
What is the maximum clamping voltage of the 3KASMC24AHE3_A/H under peak surge conditions?
The 3KASMC24AHE3_A/H clamps to a maximum of 38.9 V when subjected to its rated 77.1 A peak pulse current (10/1000 μs waveform). This value is measured and guaranteed per the Vishay datasheet (Document Number: 89962, page 2), and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Is the 3KASMC24AHE3_A/H qualified for automotive applications?
Yes, the 3KASMC24AHE3_A/H is fully AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (page 1, FEATURES section and page 2, Notes section). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, confirming suitability for engine control, body electronics, and ADAS power systems.
What package type does the 3KASMC24AHE3_A/H use, and what are its key mechanical attributes?
The 3KASMC24AHE3_A/H uses the DO-214AB (SMC) surface-mount package. Key attributes include a 0.320" (8.13 mm) maximum body length, matte tin-plated leads compliant with J-STD-002, and a cathode band marking. The molding compound meets UL 94 V-0 flammability rating, and the device is rated MSL Level 1 for lead-free reflow.
Does the 3KASMC24AHE3_A/H have unidirectional or bidirectional polarity?
The 3KASMC24AHE3_A/H is unidirectional only, as confirmed in the Vishay datasheet (page 1, FEATURES section). It functions as a standard avalanche diode, conducting surge current from cathode to anode when reverse voltage exceeds its breakdown threshold - making it appropriate for DC rail protection with defined polarity.
What is the thermal resistance and maximum junction temperature specification for the 3KASMC24AHE3_A/H?
The 3KASMC24AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W when mounted on the minimum recommended pad layout, and a maximum junction temperature (TJ) of +185 °C. These values are specified in the Thermal Characteristics table (page 2 of datasheet 89962) and enable operation in high-ambient environments like engine compartments.
3KASMC24AHE3_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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 77.1A
- 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)
3KASMC24AHE3_A/H FAQ
1.How can I place an order for 3KASMC24AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC24AHE3_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 3KASMC24AHE3_A/H reliable?
The price and inventory of 3KASMC24AHE3_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 3KASMC24AHE3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC24AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC24AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC24AHE3_A/H?
3KASMC24AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC24AHE3_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 3KASMC24AHE3_A/H?
For technical support, including 3KASMC24AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC24AHE3_A/H requirements.
6.How does Aetrix verify that 3KASMC24AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC24AHE3_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 3KASMC24AHE3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC24AHE3_A/H?
All 3KASMC24AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC24AHE3_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 3KASMC24AHE3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC24AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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