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Vishay General Semiconductor - Diodes Division SMCJ45AHM3/I
- Part No.:
- SMCJ45AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45AHM3/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,292
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Product details
Overview
SMCJ45AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR), and 1500 W peak pulse power (10/1000 µs). It clamps transients to ≤72.7 V at 20.6 A peak current and operates from –55 °C to +150 °C, commonly used to protect automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCJ45AHM3/I datasheet, SMCJ45AHM3/I pinout, SMCJ45AHM3/I application, or SMCJ45AHM3/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low incremental surge resistance, and verified clamping performance under standardized 10/1000 µs surge waveforms.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response (<1 ps) and stable clamping across temperature. Its unidirectional polarity features a cathode band marking and supports peak forward surge current up to 200 A (8.3 ms half-sine), with thermal resistance of 15 °C/W junction-to-lead.
Designed for automated SMT assembly, it meets J-STD-020 MSL Level 1 (260 °C peak reflow) and JESD201 Class 2 whisker resistance. The SMC package provides robust mechanical mounting on 8.0 mm × 8.0 mm copper pads per terminal, enabling reliable heat dissipation in high-reliability automotive and industrial PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR @ IT = 1.0 mA | 50.0–55.3 V - Breakdown voltage tolerance ensures predictable turn-on during overvoltage events. |
| VC @ IPPM = 20.6 A | ≤72.7 V - Clamped voltage under 1500 W surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capability with 10/1000 µs waveform; validates robustness against lightning-induced surges. |
| IFSM | 200 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports protection of power rails during load dump events. |
| TJ Range | –55 °C to +150 °C - Extended junction temperature range enables deployment in under-hood automotive and industrial environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ45AHM3/I uses the standard SMC (DO-214AB) package: two-terminal device with cathode marked by a band on the body. Leads are matte tin-plated and solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; forms current path during reverse-biased clamping. |
| Cathode | High-side connection point | Connected to protected line (e.g., CAN_H, LIN, sensor output); carries surge current into ground during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance requirements for modern automotive and industrial electronics without compromising surge performance. |
| Low incremental surge resistance | Enables tighter clamping voltage margin and reduced energy dissipation in the protected circuit during transient events. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and direct placement into reflow ovens at 260 °C peak without pre-baking. |
| Glass passivated junction | Provides stable leakage characteristics and long-term reliability under repeated surge stress and high-temperature operation. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine control units and ADAS modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and ECU input to clamp ESD and load-dump induced transients. Use Value: Limits voltage seen by downstream op-amps and ADC inputs to ≤72.7 V, preventing latch-up or permanent damage during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding RS-485, CAN, or digital I/O pins on PLC modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff-connected TVS on data lines to absorb induced lightning surges and switching noise from adjacent motor drives. Use Value: Maintains signal integrity by clamping transients within 1 ns while sustaining 1500 W peak power-critical for maintaining communication uptime in factory automation. |
| Power Supply Input Protection | Consumer Device USB Port |
|
Use Scenario: Secondary overvoltage protection on 12 V or 24 V DC input rails of infotainment head units and telematics gateways. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing residual transients after primary LC filtering and upstream TVS stages. Use Value: Handles up to 200 A surge current (8.3 ms), providing robust defense against battery reverse connection and alternator load dump per ISO 16750-2. |
Use Scenario: ESD and surge suppression on VBUS and D+/D− lines of USB Type-A ports in smart home hubs and portable medical devices. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed directly at connector to shunt fast transients before reaching USB PHY ICs. Use Value: Achieves <100 pF typical junction capacitance at zero bias, preserving USB 2.0 signal rise/fall times while meeting IEC 61000-4-2 Level 4 (±15 kV air). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45AHE3/A | Same VWM (45 V) and VC (72.7 V), but lower PPPM = 400 W and SMA package (smaller footprint, higher RθJA = 110 °C/W). | Not suitable for high-energy surges like ISO 7637-2 Pulse 5; limited to board-level ESD and low-energy transients. | Select when space-constrained layout prioritizes size over surge robustness and thermal performance. |
| SMCJ45A-M3/57T | Identical electrical specs and SMC package, but uses M3 (halogen-free RoHS) without AEC-Q101 qualification; same 20.6 A IPPM. | Lacks automotive qualification documentation; acceptable for industrial/commercial use where AEC-Q101 is not mandated. | Choose for cost-sensitive non-automotive designs requiring identical surge performance and halogen-free compliance. |
Compared with SMCJ45AHM3/I, SMAJ45AHE3/A offers smaller size but sacrifices 73% peak power handling and thermal robustness, while SMCJ45A-M3/57T matches all surge parameters but omits AEC-Q101 validation-making SMCJ45AHM3/I the only option qualified for automotive under-hood deployment.
Availability
SMCJ45AHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and power supply input surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCJ45AHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom infrastructure where sustained surge immunity and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMCJ45AHM3/I at its rated peak pulse current?
The SMCJ45AHM3/I clamps to a maximum of 72.7 V when subjected to its rated peak pulse current of 20.6 A (10/1000 µs waveform). This value is measured under standardized test conditions with 8.0 mm × 8.0 mm copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ45AHM3/I maintains this clamping performance across its full operating temperature range.
Is SMCJ45AHM3/I qualified for automotive applications?
Yes, SMCJ45AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88394 (Revision 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock-validating its suitability for under-hood and chassis-mounted automotive systems. The SMCJ45AHM3/I is explicitly designated for automotive use in the manufacturer's preferred part numbering scheme.
What does the "HM3" suffix indicate in SMCJ45AHM3/I?
The "HM3" suffix in SMCJ45AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., "M3") and confirms compliance with automotive environmental and reliability standards. The "H" prefix signals AEC-Q101 qualification, while "M3" specifies halogen-free molding compound and matte tin plating-both verified in Vishay's official ordering information table.
Can SMCJ45AHM3/I be used in bidirectional configurations?
No, SMCJ45AHM3/I is a unidirectional TVS diode, as indicated by its "A" suffix (not "CA") and cathode band marking. Bidirectional variants such as SMCJ45CA exist in the same family but feature symmetrical breakdown behavior and no polarity marking. Using SMCJ45AHM3/I in bidirectional applications would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit.
What is the thermal resistance of SMCJ45AHM3/I from junction to lead?
The SMCJ45AHM3/I has a typical thermal resistance of 15 °C/W from junction to lead (RθJL), as specified in the Thermal Characteristics section of Vishay's datasheet 88394. This low value enables efficient heat transfer to the PCB copper pads during repetitive surge events and supports reliable operation at elevated ambient temperatures. It complements the device's 75 °C/W junction-to-ambient rating under standard mounting conditions.
SMCJ45AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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)
SMCJ45AHM3/I FAQ
1.How can I place an order for SMCJ45AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45AHM3/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 SMCJ45AHM3/I reliable?
The price and inventory of SMCJ45AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ45AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45AHM3/I?
SMCJ45AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45AHM3/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 SMCJ45AHM3/I?
For technical support, including SMCJ45AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45AHM3/I requirements.
6.How does Aetrix verify that SMCJ45AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ45AHM3/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 SMCJ45AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ45AHM3/I?
All SMCJ45AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45AHM3/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 SMCJ45AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ45AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45AHM3/I Tags
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