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Vishay General Semiconductor - Diodes Division SMCJ45CAHM3_A/I
- Part No.:
- SMCJ45CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CAHM3_A/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,421
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Product details
Overview
SMCJ45CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection. It features a 45 V stand-off voltage (VWM), 72.7 V maximum clamping voltage (VC) at 20.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed to safeguard MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial power electronics.
For engineers reviewing the SMCJ45CAHM3_A/I datasheet, SMCJ45CAHM3_A/I pinout, SMCJ45CAHM3_A/I application, or SMCJ45CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions (VBR min/max = 50.0–55.3 V at IT = 1.0 mA), enabling robust protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable leakage performance (ID ≤ 1.0 µA at VWM) and fast response time (< 1 ps), critical for suppressing ESD and lightning-induced surges before downstream components are damaged.
The SMCJ45CAHM3_A/I is rated for TJ = –55 °C to +150 °C operation, with thermal resistance RθJL = 15 °C/W to leads and derating curves defined per Fig. 2. It meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and its matte tin-plated terminals comply with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 36–48 V nominal systems. |
| VBR (min/max) | 50.0 V / 55.3 V at IT = 1.0 mA - Bidirectional breakdown threshold range; ensures consistent clamping onset across polarity and temperature. |
| VC @ IPPM | 72.7 V at 20.6 A - Clamped voltage during 10/1000 µs surge; limits stress on protected ICs to < 73 V under full-rated transient. |
| PPPM | 1500 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity when properly laid out. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 0.31″ × 0.31″ copper pads; determines max ambient temperature for 150 °C TJ limit. |
| Package | SMC (DO-214AB) - Industry-standard 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with automated pick-and-place and reflow. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| Compliance | Halogen-free, RoHS-compliant (HM3 suffix); meets UL 94 V-0 flammability rating for molding compound. |
Pinout & Package
Package: SMC (DO-214AB), 2-terminal surface-mount case with cathode/anode symmetry for bidirectional operation. No polarity marking on device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (bidirectional) | Accepts surge current from either direction; connects to protected line or node requiring clamping. |
| Cathode | Transient current exit point (bidirectional) | Completes low-impedance path to ground or return rail during overvoltage event; symmetric with anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), or ungrounded power rails without polarity concerns. |
| 1500 W peak pulse power | Supports high-energy transients per IEC 61000-4-5; sustains 20.6 A surge current without degradation when mounted on recommended 8 mm × 8 mm pads. |
| AEC-Q101 qualification | Validates reliability for automotive under-hood and infotainment applications, including extended temperature cycling and humidity exposure. |
| Halogen-free & RoHS | Meets global environmental compliance requirements (HM3 suffix); eliminates brominated flame retardants while maintaining UL 94 V-0 rating. |
| MSL Level 1 | Allows unlimited floor life and standard reflow profile (peak 260 °C); eliminates baking requirement prior to assembly. |
| Glass-passivated junction | Ensures stable reverse leakage (< 1.0 µA at 45 V) and long-term parameter stability across temperature and humidity stress. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
|
Use Scenario: Protection of 48 V battery-fed ECUs, junction boxes, and DC-DC converter inputs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector entry point to shunt >100 V transients before reaching power management ICs. Use Value: Limits clamped voltage to 72.7 V, ensuring downstream 80 V-rated MOSFETs and controllers remain within safe SOA during 12 V/48 V system surges. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA, 0–10 V) and digital sensor interfaces (I²C, SPI) in factory automation PLC modules. IC Role / Device Role / Timing Role: Fast-response transient suppressor bridging signal line to ground, activated within picoseconds of ESD or inductive kick. Use Value: Maintains signal integrity by clamping transients below 73 V while adding < 100 pF capacitance at 0 V bias - negligible impact on 100 kHz sensor bandwidth. |
| Telecom Power Feeds | Consumer Power Adapters |
|
Use Scenario: Input-stage surge suppression on PoE-powered switches and base station RF front-end power supplies. IC Role / Device Role / Timing Role: Primary-level TVS absorbing lightning-induced common-mode surges on 48 V DC input rails before DC-DC regulation. Use Value: Handles 1500 W peak pulse energy without failure, enabling compliance with IEC 61000-4-5 Level 4 (4 kV line-earth) with minimal PCB area. |
Use Scenario: Secondary-side overvoltage protection in USB-C PD adapters and multi-output AC-DC bricks exposed to mains transients. IC Role / Device Role / Timing Role: Bidirectional clamp across isolated 20 V output rails to prevent damage from backfeed or coupling events. Use Value: Symmetric 50–55.3 V breakdown ensures equal protection regardless of output polarity; halogen-free construction satisfies regional eco-regulations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA-E3/57T | Same VWM (45 V) and VC (72.7 V), but lower PPPM (400 W); SMA package (smaller footprint, higher RθJA = 110 °C/W). | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy transients in space-constrained consumer designs. | Select only if board area is critical and surge threat level is ≤ Level 2 (1 kV). |
| SMCJ45CAHE3_A/I | Identical electrical specs and SMC package, but RoHS-compliant commercial grade (HE3) without halogen-free certification or AEC-Q101 qualification. | Lacks automotive qualification and halogen-free assurance; acceptable for industrial/commercial non-automotive use. | Choose when AEC-Q101 and halogen-free requirements are not mandated, reducing cost without sacrificing clamping performance. |
Compared with SMCJ45CAHM3_A/I, SMAJ45CA-E3/57T trades surge capacity and thermal performance for smaller size, while SMCJ45CAHE3_A/I retains identical protection capability but omits automotive qualification and halogen-free compliance - making SMCJ45CAHM3_A/I the sole option meeting all three criteria: 1500 W rating, AEC-Q101, and halogen-free RoHS.
Availability
SMCJ45CAHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom power feed hardening, and consumer adapter secondary-side surge suppression requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ45CAHM3_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 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 - engineered for automotive, industrial, and telecom infrastructure where sustained surge immunity and long-term parametric stability are mandatory.
FAQ
What is the clamping voltage of SMCJ45CAHM3_A/I at its rated peak pulse current?
The SMCJ45CAHM3_A/I has a maximum clamping voltage (VC) of 72.7 V at its rated peak pulse current (IPPM) of 20.6 A, measured under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during a full-rated surge event. The SMCJ45CAHM3_A/I maintains this clamping performance due to its low incremental surge resistance and glass-passivated junction structure.
Is SMCJ45CAHM3_A/I qualified for automotive applications?
Yes, the SMCJ45CAHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the SMCJ5.0A–SMCJ188CA datasheet (Rev. 09-Jan-2024, Doc. #88394). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, validating its suitability for under-hood and infotainment systems. The SMCJ45CAHM3_A/I also meets MSL Level 1 for lead-free reflow compatibility.
How does the bidirectional design of SMCJ45CAHM3_A/I affect its circuit implementation?
The bidirectional design of SMCJ45CAHM3_A/I eliminates polarity marking and enables direct placement across any two-node interface - such as differential signal pairs (CAN, RS-485), AC power lines, or floating power rails - without regard to voltage polarity. Unlike unidirectional TVS diodes, the SMCJ45CAHM3_A/I provides symmetrical clamping in both directions, ensuring consistent protection whether the transient is positive- or negative-going relative to ground. This simplifies layout and reduces BOM count.
What is the thermal resistance of SMCJ45CAHM3_A/I, and how does it impact PCB layout?
The SMCJ45CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes standard FR-4 board material and no internal plane layers. To maintain junction temperature ≤150 °C at full 6.5 W steady-state dissipation, ambient must stay ≤95 °C - underscoring the need for adequate copper area. Reducing pad size increases RθJA and risks thermal runaway during repetitive surges.
Does SMCJ45CAHM3_A/I meet halogen-free and RoHS requirements?
Yes, the "HM3" suffix in SMCJ45CAHM3_A/I explicitly denotes halogen-free, RoHS-compliant construction per Vishay's material categorization (Doc. #99912). The molding compound meets UL 94 V-0 flammability rating without brominated or chlorinated flame retardants, and the matte tin-plated leads comply with J-STD-002 solderability standards. This makes the SMCJ45CAHM3_A/I suitable for environmentally regulated markets including EU, China, and Japan.
SMCJ45CAHM3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ45CAHM3_A/I FAQ
1.How can I place an order for SMCJ45CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CAHM3_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 SMCJ45CAHM3_A/I reliable?
The price and inventory of SMCJ45CAHM3_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 SMCJ45CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ45CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CAHM3_A/I?
SMCJ45CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CAHM3_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 SMCJ45CAHM3_A/I?
For technical support, including SMCJ45CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ45CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ45CAHM3_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 SMCJ45CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ45CAHM3_A/I?
All SMCJ45CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CAHM3_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 SMCJ45CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ45CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45CAHM3_A/I Tags
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