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Vishay General Semiconductor - Diodes Division 3KASMC26AHM3_A/I
- Part No.:
- 3KASMC26AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC26AHM3_A/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,320
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Product details
Overview
3KASMC26AHM3_A/I 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 42.1 V under 71.3 A surge current, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and ICs against inductive switching transients.
For engineers reviewing the 3KASMC26AHM3_A/I datasheet, 3KASMC26AHM3_A/I pinout, 3KASMC26AHM3_A/I application, or 3KASMC26AHM3_A/I equivalent, key selection criteria include its DO-214AB (SMC) package, AEC-Q101 qualification, 26 V stand-off voltage, low incremental surge resistance, and MSL Level 1 reflow compatibility at 260 °C peak.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and fast response to transient overvoltages. Its unidirectional polarity and 185 °C maximum junction temperature support operation in under-hood automotive environments and high-reliability industrial controls.
The device achieves 42.1 V clamping voltage at 71.3 A (10/1000 μs), with 1.0 mA test current defining breakdown at 28.9–31.9 V and reverse leakage limited to 1.0 μA at 26 V stand-off. Thermal resistance is 77.5 °C/W (junction-to-ambient) and 18.3 °C/W (junction-to-leads).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR (min/max) | 28.9 V / 31.9 V - Breakdown occurs within this range at 1.0 mA; ensures predictable turn-on threshold. |
| VC @ IPPM | 42.1 V - Clamped voltage during 71.3 A 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 3000 W - Peak pulse power handling capability; supports high-energy transients like load dump or ISO 7637-2 pulses. |
| TJ max. | 185 °C - Enables use in high-ambient environments (e.g., engine control units) without derating penalties. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability per stress testing standards including HTRB, HTGB, and TCT. |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and matte tin leads. |
Pinout & Package
DO-214AB (SMC) package: cathode-indicating band on one end; two-terminal axial configuration with gull-wing leads. Mounting requires minimum pad layout per Vishay spec: 3.20 mm × 1.52 mm pads, 4.69 mm max center-to-center spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; connected to protected circuit ground or low-side return path. | Defines reference node for clamping action; must be routed with low-inductance path to minimize overshoot. |
| Cathode | Current exit point during reverse-biased clamping; connected to protected line (e.g., 24 V supply rail). | Carries full surge current during transient events; requires thermal relief and adequate copper area for heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable leakage and breakdown behavior across 185 °C operation. |
| MSL Level 1 rating | Compatible with standard SMT reflow profiles up to 260 °C peak, eliminating moisture sensitivity handling requirements. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD or inductive kick), improving system immunity. |
| Uni-directional polarity | Provides precise clamping only on positive-going surges relative to ground - ideal for DC power rail protection. |
| High IFSM | 200 A 8.3 ms half-sine surge rating enables survival of repetitive load-dump events in 12/24 V vehicle systems. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protecting 24 V supply lines in engine control modules from ISO 7637-2 pulse 1 (inductive switch-off) and pulse 5a (load dump). IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and downstream DC/DC converter input. Use Value: Limits transient voltage to ≤42.1 V, preventing damage to 36 V-rated regulators and microcontrollers. |
Use Scenario: Safeguarding gate drivers and logic inputs in variable-frequency drives exposed to back-EMF spikes from 3-phase motors. IC Role / Device Role / Timing Role: Fast-response surge suppressor on auxiliary 15 V bias rail feeding isolated gate driver ICs. Use Value: Sub-1 ns response time and 3000 W pulse handling prevent latch-up or permanent failure during motor stall events. |
| Telecom Power Interface | Consumer Appliance Mainboard |
Use Scenario: Shielding PoE-powered Ethernet switches from lightning-induced surges entering via DC input connectors. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V input bus upstream of DC/DC converters and hot-swap controllers. Use Value: AEC-Q101 qualification and 185 °C rating ensure long-term reliability in sealed, fanless telecom enclosures. |
Use Scenario: Guarding microcontroller I/O and relay coil drivers in smart washing machines subject to pump motor commutation noise. IC Role / Device Role / Timing Role: Localized clamping device on 5 V/12 V internal rails adjacent to noisy solenoid loads. Use Value: Low 1.0 μA leakage at 26 V prevents standby current drain while maintaining fast clamping response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A-E3/57T (Vishay) | Same DO-214AC (SMA) package; lower 400 W PPPM; 26 V VWM; 150 °C TJ max. | Limited to lower-energy transients (e.g., ESD, not load dump); unsuitable for under-hood automotive use. | Select when space-constrained layouts require smaller SMA footprint and surge energy is ≤400 W. |
| 1.5KE27A (ON Semiconductor) | Through-hole DO-201AE package; 1500 W PPPM; 27 V VWM; 175 °C TJ max.; higher VC = 43.5 V. | Requires PCB through-hole mounting; less suitable for automated SMT production or high-vibration environments. | Choose for legacy designs using through-hole assembly or where cost-per-watt favors axial leaded alternatives. |
Compared with SMAJ26A-E3/57T and 1.5KE27A, the 3KASMC26AHM3_A/I provides 7.5× higher pulse power, 35 °C higher junction rating, and SMT-ready DO-214AB packaging - making it the only option qualified for AEC-Q101-compliant 24 V automotive power rail protection.
Availability
3KASMC26AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor drives, telecom power interfaces, and consumer appliance mainboards requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for 3KASMC26AHM3_A/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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMC series was engineered specifically for high-temperature, high-power transient suppression in automotive power distribution systems - delivering AEC-Q101 qualification, 185 °C operation, and 3000 W pulse capability in compact SMC packages.
FAQ
What is the clamping voltage of the 3KASMC26AHM3_A/I under maximum surge conditions?
The 3KASMC26AHM3_A/I clamps at 42.1 V when subjected to its rated 71.3 A peak pulse current (10/1000 μs waveform). This value is measured per ANSI/IEEE C62.35 and represents the maximum voltage seen by downstream components during worst-case transient events. The 3KASMC26AHM3_A/I maintains this clamping performance across its full operating temperature range up to 185 °C junction temperature.
Is the 3KASMC26AHM3_A/I qualified for automotive applications?
Yes, the 3KASMC26AHM3_A/I is AEC-Q101 qualified and explicitly rated for automotive use. It meets stress test requirements including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT). Its 185 °C maximum junction temperature and DO-214AB package with MSL Level 1 reflow compatibility make it suitable for engine control units, body control modules, and other under-hood applications.
What does the "_A/I" suffix mean in 3KASMC26AHM3_A/I?
The "_A/I" suffix in 3KASMC26AHM3_A/I indicates the packaging configuration: "A" denotes the base revision code per Vishay's naming convention, and "I" specifies 13-inch diameter plastic tape-and-reel delivery containing 3500 units. This matches the ordering information in Document Number 89962, where "I" is defined as the preferred package code for high-volume SMT assembly.
How does the 3KASMC26AHM3_A/I compare to standard SMAJ-series TVS diodes?
The 3KASMC26AHM3_A/I delivers 3000 W peak pulse power - 7.5× higher than the 400 W rating of SMAJ26A - and operates up to 185 °C versus 150 °C for SMAJ devices. It uses the larger DO-214AB (SMC) package for superior thermal dissipation and is AEC-Q101 qualified, whereas most SMAJ variants are not automotive-qualified. The 3KASMC26AHM3_A/I is engineered for sustained high-energy transients like load dump, unlike SMAJ parts intended for ESD-level protection.
What is the reverse leakage current specification for the 3KASMC26AHM3_A/I at 25 °C and 150 °C?
At 25 °C and 26 V reverse stand-off voltage (VWM), the 3KASMC26AHM3_A/I exhibits a maximum reverse leakage current of 1.0 μA. At elevated temperature (TJ = 150 °C), leakage increases to 50 μA - still well within safe limits for low-power system monitoring circuits. These values are confirmed in the Electrical Characteristics table of Vishay Document Number 89962.
3KASMC26AHM3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 71.3A
- 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)
3KASMC26AHM3_A/I FAQ
1.How can I place an order for 3KASMC26AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC26AHM3_A/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 3KASMC26AHM3_A/I reliable?
The price and inventory of 3KASMC26AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC26AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC26AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC26AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC26AHM3_A/I?
3KASMC26AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC26AHM3_A/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 3KASMC26AHM3_A/I?
For technical support, including 3KASMC26AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC26AHM3_A/I requirements.
6.How does Aetrix verify that 3KASMC26AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC26AHM3_A/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 3KASMC26AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC26AHM3_A/I?
All 3KASMC26AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC26AHM3_A/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 3KASMC26AHM3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC26AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC26AHM3_A/I Tags
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