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Vishay General Semiconductor - Diodes Division SMC3K75CAHM3/9A
- Part No.:
- SMC3K75CAHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K75CAHM3/9A.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,532
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Product details
Overview
SMC3K75CAHM3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in the SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 83.3–92.1 V breakdown voltage, and 75 V standoff voltage. It clamps transients to ≤121 V at 24.8 A peak surge current and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SMC3K75CAHM3/9A datasheet, SMC3K75CAHM3/9A pinout, SMC3K75CAHM3/9A application, or SMC3K75CAHM3/9A equivalent, key selection criteria include bidirectional clamping capability, 150 °C max junction temperature, MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction with matte tin-plated leads.
Technical Context
This TVS diode operates as a voltage-clamping protection device across sensitive signal or power lines, responding within picoseconds to transient overvoltages induced by inductive switching or ESD events. Its low incremental surge resistance and fast response time ensure minimal let-through energy during 10/1000 μs surges.
The device is designed for unidirectional PCB mounting only-bottom-side wave soldering is not recommended-and requires thermal derating above 25 °C ambient per Fig. 2. It meets UL 497B (E136766) for safety and J-STD-020 MSL Level 1 reflow compatibility up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 3000 W - sustains high-energy transients without failure in automotive load-dump or inductive-switching scenarios |
| Breakdown Voltage (VBR) | 83.3–92.1 V - ensures reliable conduction onset above normal operating voltage but below system damage threshold |
| Standoff Voltage (VWM) | 75 V - blocks leakage current during nominal 72 V automotive battery operation with ≤2.0 μA reverse leakage |
| Clamping Voltage (VC) | ≤121 V at 24.8 A - limits downstream voltage stress to safe levels for 75 V-rated ICs and MOSFETs |
| Junction Temperature Range | −55 to +150 °C - supports under-hood automotive deployment and industrial environments with wide thermal cycling |
| Package | SMC (DO-214AB) - standardized 8.0 × 8.0 mm copper pad footprint compatible with automated SMT assembly |
| Qualification | AEC-Q101 qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
SMC3K75CAHM3/9A uses the standard SMC (DO-214AB) surface-mount package: two-terminal, bidirectional, unmarked polarity. The device has no internal pin numbering; both terminals are symmetrical and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals serve identical clamping function; no polarity marking required for bidirectional operation |
| Cathode/Anode (symmetrical) | Transient conduction path | Terminal symmetry enables flexible PCB routing without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or differential signal lines without polarity-sensitive placement |
| 3000 W peak pulse rating | Handles severe ISO 7637-2 Pulse 5a load-dump events in 12 V/24 V automotive systems |
| AEC-Q101 qualification | Validated for automotive use including HTGB, TCT, and UHAST testing per JEDEC standards |
| MSL Level 1 (260 °C) | Enables single-pass lead-free reflow without baking or special handling prior to assembly |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 75 V-rated DC-DC converter inputs against alternator load dump transients in commercial vehicle ECUs. IC Role / Device Role / Timing Role: Primary clamping element placed directly across input rails upstream of regulator ICs. Use Value: Limits peak rail voltage to ≤121 V during 3000 W surges, preventing overvoltage shutdown or latch-up in downstream PMICs. |
Use Scenario: Shielding 4–20 mA current-loop sensor outputs from ESD and cable-induced transients in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional shunt protector on analog output pins interfacing with long field wiring. Use Value: Maintains signal integrity by clamping ±15 kV contact ESD pulses to <121 V with sub-nanosecond response. |
| Telecom Power Feeds | Consumer Power Adapters |
Use Scenario: Safeguarding PoE++ (IEEE 802.3bt Type 4) 57 V power feed circuits from lightning-induced surges on outdoor Ethernet runs. IC Role / Device Role / Timing Role: Secondary-level TVS on PSE side, coordinated with primary GDT or MOV protection. Use Value: Provides precise 75 V standoff and low clamping ratio (VC/VWM = 1.61), minimizing stress on IEEE-compliant PD controllers. |
Use Scenario: Input-stage surge suppression in universal-input (90–264 VAC) laptop adapters with 75 V intermediate bus architecture. IC Role / Device Role / Timing Role: Clamping component across bulk capacitor terminals after bridge rectifier. Use Value: Absorbs 10/1000 μs line-surge events per IEC 61000-4-5 Level 3 without degrading capacitor lifetime or causing OVP trips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K75CAHM3_A | Same electrical specs and AEC-Q101 qualification; updated suffix denotes revised manufacturing flow and enhanced traceability | Identical use cases; preferred for new designs due to active status and extended lifecycle support | Select SMC3K75CAHM3_A when initiating new production-SMC3K75CAHM3/9A is Not for New Designs per Vishay doc #89433 |
| SMAJ75CA | Lower 400 W peak power rating, SMA (DO-214AC) package, same 75 V VWM, but higher clamping voltage (120 V vs. 121 V) and non-AEC-Q101 | Suitable for cost-sensitive consumer or industrial applications where 3000 W surge immunity is not required | Choose SMAJ75CA only for space-constrained layouts needing smaller footprint; verify thermal margin for repeated surges |
Compared with SMC3K75CAHM3/9A, SMC3K75CAHM3_A offers identical protection performance with formal design-in support, while SMAJ75CA trades surge robustness and automotive qualification for reduced size and cost-making it viable only in lower-energy environments.
Availability
SMC3K75CAHM3/9A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom power feeds, and consumer power adapter designs requiring stable component supply and legacy design continuity.
Supply support for SMC3K75CAHM3/9A 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, MOSFETs, and protection devices with emphasis on reliability and automotive-grade validation.
The SMC3KxxCA series was engineered specifically for high-power transient suppression in harsh automotive and industrial environments, delivering 3000 W clamping with AEC-Q101 assurance and MSL Level 1 reflow compatibility.
FAQ
Is SMC3K75CAHM3/9A still recommended for new designs?
No-Vishay explicitly marks SMC3K75CAHM3/9A as "Not for New Designs" in document #89433 (Rev. 13-Sep-2022). Engineers should migrate to the active replacement SMC3K75CAHM3_A, which maintains identical electrical and mechanical specifications while offering full lifecycle support and updated manufacturing controls. SMC3K75CAHM3/9A remains available for legacy production continuity.
What is the maximum clamping voltage of SMC3K75CAHM3/9A at its rated surge current?
The maximum clamping voltage (VC) of SMC3K75CAHM3/9A is 121 V when subjected to its peak pulse current of 24.8 A (10/1000 μs waveform). This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components exposed to the protected node will not experience voltages exceeding 121 V during worst-case transient events.
Does SMC3K75CAHM3/9A require orientation-specific placement on the PCB?
No-SMC3K75CAHM3/9A is a bidirectional TVS diode with symmetrical terminals and no polarity marking. Both ends function identically, allowing unrestricted placement on the PCB without regard to anode/cathode orientation. This simplifies layout and eliminates risk of misplacement during automated assembly.
What is the standoff voltage rating of SMC3K75CAHM3/9A, and how does it relate to system operation?
The standoff voltage (VWM) of SMC3K75CAHM3/9A is 75 V, meaning it remains in high-impedance blocking mode for all reverse voltages ≤75 V. In practice, this allows reliable operation across nominal 72 V automotive battery systems (e.g., Class 3 commercial vehicles) with margin for ripple and transients below the 83.3 V minimum breakdown threshold of the SMC3K75CAHM3/9A.
Can SMC3K75CAHM3/9A be used in lead-free reflow processes without preconditioning?
Yes-SMC3K75CAHM3/9A meets J-STD-020 MSL Level 1 with a maximum peak reflow temperature of 260 °C, permitting direct placement into standard lead-free reflow ovens without baking or dry-pack handling. Its molding compound complies with UL 94 V-0, and matte tin-plated leads satisfy JESD 22-B102 solderability requirements.
SMC3K75CAHM3/9A 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 24.8A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMC3K75CAHM3/9A FAQ
1.How can I place an order for SMC3K75CAHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K75CAHM3/9A 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 SMC3K75CAHM3/9A reliable?
The price and inventory of SMC3K75CAHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K75CAHM3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K75CAHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K75CAHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K75CAHM3/9A?
SMC3K75CAHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K75CAHM3/9A 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 SMC3K75CAHM3/9A?
For technical support, including SMC3K75CAHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K75CAHM3/9A requirements.
6.How does Aetrix verify that SMC3K75CAHM3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K75CAHM3/9A 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 SMC3K75CAHM3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K75CAHM3/9A?
All SMC3K75CAHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K75CAHM3/9A, 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 SMC3K75CAHM3/9A part is unused and in its original packaging.
Return procedure for SMC3K75CAHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K75CAHM3/9A Tags
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