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Vishay General Semiconductor - Diodes Division SMBJ45CA-E3/52
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- Part No.:
- SMBJ45CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CA-E3/52.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,815
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Product details
Overview
SMBJ45CA-E3/52 from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown range (VBR), 72.7 V maximum clamping voltage (VC) at 8.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ45CA-E3/52 datasheet, SMBJ45CA-E3/52 pinout, SMBJ45CA-E3/52 application, or SMBJ45CA-E3/52 equivalent, key selection criteria include bidirectional clamping symmetry, low thermal resistance (RθJL = 20 °C/W), UL 497B recognition, AEC-Q101 qualification eligibility, and DO-214AA package compatibility with automated SMT assembly.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, delivering identical clamping behavior above ±45 V reverse standoff. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response (<1.0 ns), critical for protecting MOSFET gates and RS-485 transceivers against ESD and inductive switching transients.
The device is rated for repetitive surge duty cycle of 0.01 % and derates linearly above 25 °C ambient per Fig. 2, with maximum junction temperature of +150 °C and thermal resistance junction-to-lead of 20 °C/W - enabling reliable operation on standard 0.2" × 0.2" copper pads without heatsinking in most embedded applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing margin for protected lines. |
| VBR min/max | 50.0 V / 55.3 V at 1.0 mA - Confirmed bidirectional breakdown threshold; ensures predictable turn-on across manufacturing lot and temperature. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamping voltage under 10/1000 µs surge; limits downstream IC stress to sub-73 V during worst-case transients. |
| PPPM | 600 W - Peak pulse power handling capability; supports high-energy lightning-induced surges per IEC 61000-4-5 Level 3. |
| IPPM | 8.3 A - Peak pulse current corresponding to VC; determines minimum trace width and PCB layout clearance requirements. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive modules and industrial enclosures up to 85 °C ambient. |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance; allows direct solder thermal path to PCB copper, simplifying thermal design. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional surge conduction path | Either terminal serves as cathode or anode depending on transient polarity; no band marking required. |
| Case (cathode end) | Thermal and mechanical anchor | Exposed metal slug provides primary heat dissipation path to PCB copper; requires full-solder coverage for RθJL spec compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, Ethernet PHY) without polarity concerns. |
| 600 W 10/1000 µs rating | Meets IEC 61000-4-5 surge immunity requirements for industrial equipment and telecom infrastructure up to Level 3 (1 kV/2 kV line-earth). |
| UL 497B recognized (QVGQ2) | Validated for telecom line protection per Underwriters Laboratories; eliminates need for separate safety certification in end-equipment. |
| AEC-Q101 qualified option | HE3/HM3 variants support automotive body electronics and infotainment systems requiring stress-tested reliability. |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns; no baking required pre-assembly. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop sensors and analog voltage inputs in PLC I/O modules from field-wiring induced transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp surges before they reach precision op-amps or ADC front-ends. Use Value: Maintains signal integrity below 72.7 V during 8.3 A transients, preventing latch-up or damage to 24 V-rated signal conditioning circuitry. |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in base station remote units from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Primary line-side surge suppressor on differential bus lines, coordinated with GDT or MOV secondary protection. Use Value: Sub-1 ns response and symmetrical clamping ensure balanced differential voltage stays within receiver common-mode range during fast-rising events. |
| Automotive Body Control | Consumer Power Adapter Input |
|
Use Scenario: Safeguarding LIN bus nodes and door module microcontrollers against load-dump and jump-start transients in 12 V systems. IC Role / Device Role / Timing Role: Secondary protection device downstream of main fuse and upstream of LDO regulator and MCU GPIO. Use Value: Withstands 100 A IFSM (unidirectional variant) and maintains clamping performance after repeated 600 W pulses per AEC-Q101 stress testing. |
Use Scenario: Suppressing ESD and switching noise on DC input rails of USB-C PD adapters and wireless charging controllers. IC Role / Device Role / Timing Role: Final-stage transient guard before buck controller ICs and gate drivers, absorbing residual spikes from upstream filtering. Use Value: Low leakage (<1.0 µA) prevents standby current degradation; RoHS-compliant matte tin plating ensures solder joint reliability in high-volume production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No difference in circuit function or layout; selected when halogen-free compliance is mandated by OEM environmental policy. | Direct material substitution where halogen-free BOMs are required; same thermal and electrical performance. |
| SMCJ45CA-E3/52 | Same VWM/VC but higher 1500 W PPPM, larger SMC (DO-214AB) package (7.11 mm x 6.22 mm vs. 4.57 mm x 3.94 mm). | Used where higher surge energy handling is needed and PCB space permits larger footprint; not drop-in compatible due to pad layout mismatch. | Choose when system-level surge testing exceeds 600 W; requires PCB redesign for SMC pad pattern and increased thermal mass. |
Compared with SMBJ45CA-E3/52, the M3 variant offers identical protection in halogen-free form, while the SMCJ45CA-E3/52 delivers 2.5× higher surge power in a physically larger package - making SMBJ45CA-E3/52 optimal for space-constrained industrial and telecom designs requiring certified 600 W immunity.
Availability
SMBJ45CA-E3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer power adapter input stages requiring stable component supply and UL-recognized surge suppression.
Supply support for SMBJ45CA-E3/52 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-reliability surface-mount transient suppression in space-constrained environments - targeting industrial automation, telecom infrastructure, and automotive subsystems demanding consistent clamping and long-term stability.
FAQ
What is the clamping voltage of SMBJ45CA-E3/52 at its rated peak pulse current?
The SMBJ45CA-E3/52 has a maximum clamping voltage (VC) of 72.7 V at 8.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected downstream circuitry will not experience voltages exceeding 72.7 V during defined surge events - a critical parameter for ensuring compatibility with 75 V-rated interface ICs and MOSFETs.
Is SMBJ45CA-E3/52 suitable for automotive applications?
SMBJ45CA-E3/52 itself is commercial-grade, but Vishay offers AEC-Q101 qualified versions under ordering codes SMBJ45CAHE3_B/H and SMBJ45CAHM3_B/H. These variants undergo stress testing per automotive reliability standards and are approved for use in body electronics, infotainment, and lighting control modules - while the E3/52 part remains ideal for industrial and telecom applications where AEC-Q101 is not mandated.
Does SMBJ45CA-E3/52 require polarity-aware PCB layout?
No - SMBJ45CA-E3/52 is a bidirectional TVS diode with symmetrical anode/cathode terminals and no polarity marking on the SMB (DO-214AA) package. Its electrical behavior is identical in both directions, allowing placement in either orientation on differential lines like RS-485 or AC-coupled signal paths without affecting clamping performance or circuit functionality.
What is the maximum reverse leakage current for SMBJ45CA-E3/52 at its standoff voltage?
At the 45 V standoff voltage (VWM), the SMBJ45CA-E3/52 exhibits a maximum reverse leakage current (ID) of 1.0 µA at 25 °C. This low leakage ensures minimal impact on high-impedance sensor inputs and battery-powered circuits, preserving accuracy and extending standby time - especially important in precision analog front-ends and IoT edge nodes.
How does the thermal performance of SMBJ45CA-E3/52 support high-reliability designs?
SMBJ45CA-E3/52 achieves a junction-to-lead thermal resistance (RθJL) of 20 °C/W, enabling efficient heat transfer directly from the silicon die to the PCB copper via the exposed cathode slug. When mounted on recommended 0.2" × 0.2" copper pads, this allows sustained operation at +150 °C junction temperature - supporting long-term reliability in enclosed industrial enclosures and thermally demanding automotive zones without additional heatsinking.
SMBJ45CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 8.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ45CA-E3/52 FAQ
1.How can I place an order for SMBJ45CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CA-E3/52 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 SMBJ45CA-E3/52 reliable?
The price and inventory of SMBJ45CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ45CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CA-E3/52?
SMBJ45CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CA-E3/52 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 SMBJ45CA-E3/52?
For technical support, including SMBJ45CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ45CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ45CA-E3/52 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 SMBJ45CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ45CA-E3/52?
All SMBJ45CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CA-E3/52, 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 SMBJ45CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ45CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CA-E3/52 Tags
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