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Vishay General Semiconductor - Diodes Division SMC3K26CAHM3_A/H
- Part No.:
- SMC3K26CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K26CAHM3_A/H.pdf
- Description:
- 3KW, 26V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,389
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Product details
Overview
SMC3K26CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for automotive and industrial electronics protection. It features 26 V standoff voltage (VWM), 28.9–31.9 V breakdown voltage (VBR), 42.1 V clamping voltage at 538 A peak pulse current (10/1000 μs), and 3000 W peak pulse power rating - deployed to safeguard MOSFETs, ICs, and sensor signal lines against ISO 7637-2 and ISO 16750-2 transients.
For engineers reviewing the SMC3K26CAHM3_A datasheet, SMC3K26CAHM3_A pinout, SMC3K26CAHM3_A application, or SMC3K26CAHM3_A equivalent, this device is selected for high-energy transient suppression in 12 V automotive systems where bidirectional clamping, AEC-Q101 qualification, and sub-75 ns response time are required - with attention to thermal derating above 25 °C and junction-to-mount thermal resistance of 4.0 °C/W.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds its breakdown threshold (28.9–31.9 V), it rapidly transitions from high-impedance to low-impedance state, diverting surge current away from downstream circuitry. Its bidirectional architecture enables symmetric clamping for both positive and negative transients without polarity marking.
It meets ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a/b (±150–220 V), and ISO 16750-2 Pulse b load dump immunity, with verified clamping performance of −35 V / +35 V (Pulse 1/2a) and −32 V / +37 V (Pulse 3a/3b) under 12 V battery conditions. ESD robustness reaches ±30 kV per IEC 61000-4-2 (HBM contact/air).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 26 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 28.9–31.9 V at 1 mA - precise voltage threshold at which avalanche conduction initiates; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 42.1 V at 538 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 3000 W (10/1000 μs) - maximum transient energy absorption capability; supports robust protection against automotive load dump and switching spikes. |
| TJ max. | +175 °C - maximum junction temperature; enables operation in under-hood automotive environments with minimal derating. |
| ESD Rating | ±30 kV (IEC 61000-4-2 HBM) - withstands high-energy electrostatic discharges without degradation; eliminates need for additional ESD front-end stages. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock; suitable for safety-critical ECUs. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals, MSL Level 1 (260 °C reflow peak), UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | High-side connection point for bidirectional clamping | No polarity marking on bidirectional types; terminals are functionally symmetric - either lead may connect to line or ground depending on layout. |
| Anode (unmarked side) | Low-side connection point for bidirectional clamping | Identical electrical behavior to cathode; device conducts equally in both directions once VBR is exceeded in either polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints - reduces BOM count vs. dual unidirectional TVS solutions. |
| 30 kW surge capability (8/20 μs) | Supports high-current lightning-induced surges per IEC 61000-4-5; clamps at 55.8 V @ 498 A, maintaining system integrity during severe grid disturbances. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 3b); critical for protecting sensitive analog front-ends and CAN transceivers. |
| Junction-to-mount thermal resistance (RthJM) | 4.0 °C/W - enables efficient heat transfer to PCB copper pour or heatsink; sustains repeated surge duty cycles without thermal runaway. |
| UL 497B recognition (E136766) | Validates safety compliance for telecom and industrial interface protection; satisfies regulatory requirements for field-installable equipment. |
Applications
| Automotive Power Distribution Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protection of 12 V supply rail in junction box modules exposed to load dump (ISO 16750-2 Pulse b) and inductive switching noise. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly across input terminals, clamping voltage within safe limits for downstream DC/DC converters and microcontrollers. Use Value: Limits peak clamped voltage to 42.1 V during 538 A surge, preventing latch-up or permanent damage to 45 V-rated power management ICs. |
Use Scenario: Guarding analog output lines (4–20 mA, 0–10 V) of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp on differential signal pairs, suppressing ESD and cable discharge events without distorting low-level analog signals. Use Value: Delivers ±30 kV ESD immunity and clamps ISO 7637-2 Pulse 3b transients to ±37 V, preserving signal integrity and ADC accuracy. |
| Automotive Body Control Unit (BCU) | Telecom Interface Protection |
Use Scenario: Input protection for LIN bus transceivers and LED driver outputs subjected to battery reversal and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage guard on power and signal pins, operating in parallel with internal IC ESD structures to absorb bulk energy. Use Value: Withstands −35 V / +35 V clamping during ISO 7637-2 Pulse 1/2a, ensuring reliable communication even after repeated 1000-pulse stress sequences. |
Use Scenario: Surge protection on Ethernet PHY or RS-485 data lines in outdoor telecom cabinets exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Front-end TVS array element providing coarse clamping before secondary protection (e.g., GDT or polymer PTC). Use Value: Absorbs 30 kW (8/20 μs) surges up to 498 A while maintaining <1 nF junction capacitance - avoids signal attenuation or jitter in 100 Mbps links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26CA | Lower PPPM (400 W), SMA package (smaller footprint, higher RthJA = 110 °C/W), same VWM/VBR range | Limited to lower-energy transients; unsuitable for ISO 16750-2 load dump or repetitive automotive surges | Select only for space-constrained consumer electronics with ≤100 A surge exposure. |
| SMCJ26CA | Same SMC package and 3000 W rating, but non-AEC-Q101 qualified and no UL 497B recognition | Acceptable for industrial control but not certified for automotive safety-critical systems | Choose when AEC-Q101 and UL certification are not required, and cost is prioritized over automotive compliance. |
Compared with SMAJ26CA and SMCJ26CA, SMC3K26CAHM3_A uniquely combines AEC-Q101 qualification, UL 497B safety listing, and 30 kW (8/20 μs) surge capability in an SMC package - making it the only option among the three validated for full ISO 16750-2 load dump immunity in production automotive ECUs.
Availability
SMC3K26CAHM3_A is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor interfaces, telecom infrastructure protection, and power distribution modules requiring stable component supply across extended temperature ranges and high-reliability surge environments.
Supply support for SMC3K26CAHM3_A 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-power, and automotive-qualified components.
The SMC3KxxCAHM3_A series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for demanding automotive and industrial transient suppression - delivering AEC-Q101 reliability, UL safety certification, and industry-leading 30 kW surge handling in standard SMC packaging.
FAQ
What is the maximum clamping voltage of SMC3K26CAHM3_A under a 10/1000 μs surge?
The SMC3K26CAHM3_A clamps to a maximum of 42.1 V at 538 A under the standard 10/1000 μs waveform. This value is measured at the specified peak pulse current and defines the upper voltage limit imposed on protected circuitry during such transients - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is SMC3K26CAHM3_A qualified for automotive applications?
Yes, SMC3K26CAHM3_A is AEC-Q101 qualified and explicitly tested to ISO 7637-2 (Pulse 1, 2a, 3a, 3b) and ISO 16750-2 (Pulse b) standards. Its construction - including halogen-free molding compound, matte tin plating, and MSL Level 1 rating - meets automotive manufacturing and under-hood environmental requirements.
Does SMC3K26CAHM3_A have polarity markings?
No, SMC3K26CAHM3_A is a bidirectional TVS and carries no polarity marking on the SMC (DO-214AB) package. Both terminals are electrically identical; the device provides symmetrical clamping for positive and negative transients - simplifying layout and eliminating orientation errors during automated assembly.
What is the thermal resistance from junction to mount for SMC3K26CAHM3_A?
The junction-to-mount thermal resistance (RthJM) of SMC3K26CAHM3_A is 4.0 °C/W, measured per JEDEC 51-14 using the Transient Dual Interface Method. This low value enables effective heat transfer to the PCB copper pad or external heatsink, supporting sustained surge duty cycles without exceeding the +175 °C maximum junction temperature.
How does SMC3K26CAHM3_A perform under ISO 7637-2 Pulse 3b?
Under ISO 7637-2 Pulse 3b (±150 V, 150 ns, 50 Ω), SMC3K26CAHM3_A clamps to −32 V on the negative edge and +37 V on the positive edge in a 12 V battery system. This performance is verified in the official Vishay datasheet and confirms its suitability for protecting CAN, LIN, and sensor signal lines against fast, high-frequency transients.
SMC3K26CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC3K26CAHM3_A/H FAQ
1.How can I place an order for SMC3K26CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K26CAHM3_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 SMC3K26CAHM3_A/H reliable?
The price and inventory of SMC3K26CAHM3_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 SMC3K26CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K26CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K26CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K26CAHM3_A/H?
SMC3K26CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K26CAHM3_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 SMC3K26CAHM3_A/H?
For technical support, including SMC3K26CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K26CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K26CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K26CAHM3_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 SMC3K26CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K26CAHM3_A/H?
All SMC3K26CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K26CAHM3_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 SMC3K26CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMC3K26CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K26CAHM3_A/H Tags
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