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Vishay General Semiconductor - Diodes Division SMCJ45CAHM3/I
- Part No.:
- SMCJ45CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CAHM3/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,315
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Product details
Overview
SMCJ45CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features a 45 V standoff voltage (VWM), 72.7 V maximum clamping voltage at 20.6 A peak pulse current (10/1000 μs), and 1500 W peak pulse power dissipation - enabling robust protection of automotive-grade sensor interfaces and industrial I/O circuits against lightning-induced transients and inductive switching spikes.
For engineers reviewing the SMCJ45CAHM3/I datasheet, SMCJ45CAHM3/I pinout, SMCJ45CAHM3/I application, or SMCJ45CAHM3/I equivalent, this part delivers AEC-Q101 qualified reliability, halogen-free RoHS compliance, and verified bidirectional clamping performance with low incremental surge resistance - critical for ESD-sensitive analog front-ends and CAN/LIN bus protection in harsh environments.
Technical Context
The SMCJ45CAHM3/I operates as a silicon avalanche diode with symmetrical breakdown characteristics in both directions, ensuring identical clamping behavior regardless of transient polarity. Its glass-passivated junction enables fast response time (<1 ns) and stable VBR (50.0–55.3 V at 1 mA test current) across temperature.
Thermal design is supported by RθJA = 75 °C/W and RθJL = 15 °C/W, with derating above 25 °C per Figure 2. The device meets MSL Level 1 (260 °C reflow peak) and supports automated SMT placement on standard 8.0 mm × 8.0 mm copper pads per JEDEC guidelines.
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 DC systems. |
| VBR min/max | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown range ensures predictable turn-on threshold under surge conditions. |
| VC @ IPPM | 72.7 V at 20.6 A (10/1000 μs) - Clamping voltage limits downstream IC stress to safe levels during 1500 W transient events. |
| PPPM | 1500 W - Peak pulse power handling capacity validated per ANSI/IEEE C62.35, suitable for IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | 1.0 μA - Ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures without thermal derating penalties. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for high-density PCB layouts. |
Pinout & Package
SMCJ45CAHM3/I uses a 2-terminal SMC (DO-214AB) package with no polarity marking - consistent with bidirectional TVS construction. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (bidirectional) | Common connection point for symmetrical clamping; connects to protected line (e.g., CAN_H or LIN bus). |
| Terminal 2 | Cathode (bidirectional) | Common connection point for symmetrical clamping; connects to reference plane (e.g., ground or chassis return). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and lead finish - compliant with EU Directive 2011/65/EU and IPC-1752A. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.45) versus standard TVS diodes, reducing voltage overshoot during fast-rising transients. |
| MSL Level 1 rating | Supports single-reflow assembly at 260 °C peak without moisture sensitivity concerns - eliminates baking requirement pre-SMT. |
| Glass passivated junction | Provides stable electrical parameters over lifetime and improved resistance to humidity-induced parameter drift in industrial environments. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤72.7 V during 100 A load dump events, preserving 12-bit ADC accuracy and preventing latch-up in downstream signal conditioning ICs. |
Use Scenario: Shielding digital input channels of programmable logic controllers from induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Line-to-ground TVS on 24 V DC discrete input terminals interfacing with optocoupler isolation stages. Use Value: Absorbs 1500 W surges per IEC 61000-4-4 fast transient burst without degradation, maintaining >10⁶ cycle reliability in 24/7 operation. |
| Telecom Power Rail Protection | Automotive LIN Bus Protection |
|
Use Scenario: Safeguarding 48 V PoE-powered telecom equipment front-end DC-DC converters against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-stage TVS on input rail upstream of active EMI filter and buck controller. Use Value: Clamps 10/1000 μs surges to 72.7 V while sustaining 1500 W peak power - prevents MOSFET avalanche failure and gate oxide damage. |
Use Scenario: Protecting LIN transceiver pins (LIN_H/L) in body control modules from ESD and battery reversal transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across LIN differential pair and referenced to vehicle ground. Use Value: Maintains <1.0 μA leakage at 12 V supply to avoid false wake-up, while clamping ±30 kV HBM ESD to <80 V per ISO 10605. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CAHM3/I | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM and VC. | Limited to lower-energy surges (IEC 61000-4-5 Level 2); unsuitable for 1500 W automotive load dump. | Select when board space is constrained and surge energy does not exceed 600 W. |
| SMCJ45CAHE3/I | Same electrical specs but RoHS-compliant commercial grade (not AEC-Q101 qualified); E3 suffix instead of HM3. | Not approved for automotive under-hood use; acceptable for industrial/commercial control panels. | Choose for cost-sensitive non-automotive designs where AEC-Q101 is not mandated. |
Compared with SMCJ45CAHM3/I, SMBJ45CAHM3/I trades surge capacity for compactness, while SMCJ45CAHE3/I sacrifices automotive qualification for lower cost - making SMCJ45CAHM3/I the only option meeting AEC-Q101 + 1500 W + halogen-free requirements simultaneously.
Availability
SMCJ45CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom power supplies, and LIN bus protection requiring stable component supply across multi-year production cycles.
Supply support for SMCJ45CAHM3/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 passive components for automotive, industrial, and computing markets.
The SMCJ series was engineered specifically for high-power transient suppression in harsh-environment applications, emphasizing AEC-Q101 qualification, low clamping ratio, and robust thermal performance in surface-mount packages.
FAQ
What is the clamping voltage of SMCJ45CAHM3/I at its rated peak pulse current?
The SMCJ45CAHM3/I has a maximum clamping voltage (VC) of 72.7 V at 20.6 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMCJ45CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SMCJ45CAHM3/I qualified for automotive applications?
Yes, SMCJ45CAHM3/I is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's SMCJ5.0A–SMCJ188CA datasheet (Rev. 09-Jan-2024). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD - validating its suitability for under-hood and chassis-mounted automotive modules. The SMCJ45CAHM3/I is explicitly listed among AEC-Q101 options in the ordering information table.
What does the "CA" suffix indicate in SMCJ45CAHM3/I?
The "CA" suffix in SMCJ45CAHM3/I denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression in both polarities - essential for protecting AC-coupled lines or differential buses like LIN or CAN without polarity constraints. Unlike unidirectional variants (e.g., SMCJ45A), the SMCJ45CAHM3/I has no cathode band marking and exhibits identical VBR and VC characteristics in either direction.
What is the standoff voltage (VWM) of SMCJ45CAHM3/I and how is it applied in circuit design?
The SMCJ45CAHM3/I has a standoff voltage (VWM) of 45 V - the maximum DC or continuous reverse voltage that can be applied without triggering clamping action. In practice, this allows direct placement across 36–48 V nominal systems (e.g., automotive 42 V architectures or industrial 48 V rails) while maintaining <1.0 μA leakage. Designers select VWM ≥110 % of system operating voltage to ensure reliable non-conduction during normal operation.
Does SMCJ45CAHM3/I require special PCB layout considerations?
Yes - the SMCJ45CAHM3/I must be mounted on minimum recommended pad layout: 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 1500 W pulse power. Smaller pads increase thermal impedance and reduce surge capability. Additionally, short, low-inductance traces to ground or reference planes are required to preserve sub-nanosecond response time; routing should avoid vias or long stubs between the SMCJ45CAHM3/I and protected node.
SMCJ45CAHM3/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:
- -
- 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/I FAQ
1.How can I place an order for SMCJ45CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CAHM3/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/I reliable?
The price and inventory of SMCJ45CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMCJ45CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CAHM3/I?
SMCJ45CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CAHM3/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/I?
For technical support, including SMCJ45CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CAHM3/I requirements.
6.How does Aetrix verify that SMCJ45CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ45CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMCJ45CAHM3/I?
All SMCJ45CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMCJ45CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45CAHM3/I Tags
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DESD3V3E1BL-7B
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Diodes Incorporated
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