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Vishay General Semiconductor - Diodes Division SMCJ45AHE3_A/I
- Part No.:
- SMCJ45AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45AHE3_A/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,632
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Product details
Overview
SMCJ45AHE3_A/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 72.7 V clamping voltage (VC) at 20.6 A peak pulse current (IPPM). It delivers 1500 W peak pulse power (10/1000 μs waveform) and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SMCJ45AHE3_A/I datasheet, SMCJ45AHE3_A/I pinout, SMCJ45AHE3_A/I application, or SMCJ45AHE3_A/I equivalent, key selection criteria include its unidirectional polarity, 1500 W surge rating, 72.7 V clamping performance at rated IPPM, RoHS-compliant AEC-Q101 qualification, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a clamping device that transitions from high-impedance standby to low-impedance conduction when reverse voltage exceeds VBR, limiting transient overvoltage to VC. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns).
Thermal design relies on RθJA = 75 °C/W and RθJL = 15 °C/W, requiring minimum 8.0 mm × 8.0 mm copper pads per terminal for full 1500 W rating. The device is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 50.0 V / 55.3 V at IT = 1.0 mA - Confirmed breakdown range defining turn-on threshold |
| VC @ IPPM | 72.7 V at 20.6 A - Clamped voltage during 1500 W 10/1000 μs surge, critical for downstream IC survivability |
| PPPM | 1500 W - Peak pulse power handling capability under standardized surge waveform |
| ID @ VWM | 1.0 μA - Reverse leakage current at standoff voltage, ensuring minimal standby power loss |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with cathode band marking and 7.75 mm × 6.22 mm footprint |
Pinout & Package
SMCJ45AHE3_A/I uses the SMC (DO-214AB) package: a two-terminal surface-mount device with molded epoxy body, matte tin-plated leads, and cathode band marking on the unidirectional variant. Dimensions are 7.75 mm × 6.22 mm × 2.62 mm (L × W × H), compliant with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to system ground or low-side reference in unidirectional TVS configuration | Terminal where surge current enters during clamping; must be routed to lowest-impedance ground path |
| Cathode | Current exit point in forward bias; marked by band; connected to protected line (e.g., CAN_H, LIN, sensor supply) | Terminal tied to the node requiring overvoltage protection; clamping occurs between cathode and anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per AEC specification |
| Glass passivated junction | Ensures consistent VBR tolerance and long-term stability of clamping behavior across thermal and life cycles |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for sensitive 3.3 V/5 V logic interfaces |
| MSL Level 1 rating | Enables direct placement without baking; compatible with standard lead-free reflow profiles up to 260 °C peak |
| 1500 W 10/1000 μs rating | Meets ISO 7637-2 Pulse 1, Pulse 2a, and IEC 61000-4-5 Level 4 surge immunity requirements |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 45 V. Use Value: Limits clamped voltage to 72.7 V during 1500 W surges, preventing damage to 75 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt ESD and switching noise on signal lines. Use Value: Sub-1 ns response and 1.0 μA leakage preserve signal integrity and measurement accuracy in 24-bit ADC front-ends. |
| Telecom DC Power Input Protection | Consumer USB-C Power Delivery Line |
|
Use Scenario: Guarding -48 V telecom rectifier outputs against lightning-induced surges on distribution backplanes. IC Role / Device Role / Timing Role: Unidirectional suppressor installed between -48 V rail and return, referenced to system ground. Use Value: Withstands repeated 1500 W pulses while maintaining VWM = 45 V, allowing safe operation within -48 V ±10% nominal range. |
Use Scenario: Secondary-level overvoltage protection on USB-C VBUS lines after primary buck-boost regulation. IC Role / Device Role / Timing Role: Clamping device placed between VBUS and GND to absorb hot-swap and adapter fault transients. Use Value: 72.7 V clamping ensures compliance with USB PD 3.1's 50 V–57 V VBUS max, protecting Type-C port controllers and power switches. |
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 | Lower PPPM (400 W), same VWM/VBR/VC, SMA package (smaller footprint, lower thermal mass) | Not suitable for ISO 7637-2 Pulse 5a load dump; limited to ESD and lower-energy transients | Select when board space is constrained and surge energy does not exceed 400 W |
| SMCJ45CAHE3_A/I | Bidirectional variant; identical VWM/VBR/VC ratings but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD differential pairs) where polarity reversal occurs | Choose only when bidirectional protection is mandated by signal architecture |
Compared with SMAJ45AHE3/A and SMCJ45CAHE3_A/I, the SMCJ45AHE3_A/I uniquely balances 1500 W surge capacity, AEC-Q101 qualification, and unidirectional clamping in the SMC package-making it optimal for automotive power rail and industrial DC input protection where high-energy, polarity-defined transients dominate.
Availability
SMCJ45AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor signal conditioning circuits, and telecom DC power distribution systems requiring stable component supply with AEC-Q101 assurance and full 1500 W surge capability.
Supply support for SMCJ45AHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series is engineered for robust transient suppression in harsh environments-particularly targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and long-term parametric stability are mandatory.
FAQ
What is the clamping voltage of SMCJ45AHE3_A/I at its rated peak pulse current?
The SMCJ45AHE3_A/I has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current (IPPM) of 20.6 A under the standard 10/1000 μs waveform. This value is measured at TA = 25 °C with devices mounted on 8.0 mm × 8.0 mm copper pads per terminal, and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ45AHE3_A/I maintains this clamping performance across its qualified operating temperature range.
Is SMCJ45AHE3_A/I suitable for automotive applications?
Yes, SMCJ45AHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix, indicating RoHS-compliant construction and stress-tested reliability for under-hood and ECU environments. It meets requirements for load dump (ISO 7637-2 Pulse 5a), ESD (IEC 61000-4-2), and surge immunity (IEC 61000-4-5), making it appropriate for protecting power supplies, communication buses, and sensor interfaces in vehicles. The SMCJ45AHE3_A/I data sheet confirms its qualification status in the ordering information table.
How does the SMCJ45AHE3_A/I differ from the bidirectional SMCJ45CAHE3_A/I?
The SMCJ45AHE3_A/I is unidirectional, with polarity defined by a cathode band and intended for DC rail protection where surge polarity is fixed (e.g., 12 V battery line to ground). In contrast, SMCJ45CAHE3_A/I is bidirectional, offering symmetrical clamping in both directions-required for AC-coupled or differential signal lines like CAN or RS-485. Both share identical VWM (45 V), VBR (50.0–55.3 V), and VC (72.7 V) ratings, but the SMCJ45AHE3_A/I cannot protect against reverse-polarity transients without additional circuitry.
What is the thermal resistance and recommended PCB layout for SMCJ45AHE3_A/I?
The SMCJ45AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To achieve its full 1500 W peak pulse power rating, Vishay specifies mounting on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Reduced pad area de-rates power handling-verified in Figure 2 of the datasheet. The SMCJ45AHE3_A/I's thermal performance directly impacts sustained surge repetition rate and long-term reliability in high-temperature enclosures.
Does SMCJ45AHE3_A/I have a specified junction capacitance?
No, junction capacitance (CJ) is not specified for the SMCJ45AHE3_A/I in the provided Vishay datasheet (Document Number: 88394). While Figure 4 shows typical CJ curves for unidirectional SMCJ devices, it applies only to lower-voltage variants (VWM ≤ 28 V); no CJ data is published for VWM ≥ 40 V parts including SMCJ45AHE3_A/I. For high-frequency signal line protection where capacitance matters (e.g., USB, HDMI), designers should verify suitability via empirical testing or select TVS families with published CJ specs. The SMCJ45AHE3_A/I remains optimized for power rail and low-speed interface protection.
SMCJ45AHE3_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:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ45AHE3_A/I FAQ
1.How can I place an order for SMCJ45AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45AHE3_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 SMCJ45AHE3_A/I reliable?
The price and inventory of SMCJ45AHE3_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 SMCJ45AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ45AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45AHE3_A/I?
SMCJ45AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45AHE3_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 SMCJ45AHE3_A/I?
For technical support, including SMCJ45AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45AHE3_A/I requirements.
6.How does Aetrix verify that SMCJ45AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ45AHE3_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 SMCJ45AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ45AHE3_A/I?
All SMCJ45AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45AHE3_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 SMCJ45AHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ45AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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