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Vishay General Semiconductor - Diodes Division SMBJ45C-E3/52
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- Part No.:
- SMBJ45C-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45C-E3/52.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,185
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Product details
Overview
SMBJ45C-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ45C-E3/52 datasheet, SMBJ45C-E3/52 pinout, SMBJ45C-E3/52 application, or SMBJ45C-E3/52 equivalent, key selection criteria include unidirectional polarity, 150 °C max junction temperature, low incremental surge resistance, fast response time, and compliance with UL 497B for telecom and industrial surge protection.
Technical Context
This TVS diode operates as a shunt-clamping device: under normal conditions it presents high impedance (>1 MΩ leakage at 45 V), but triggers into low-impedance conduction when transient voltage exceeds VBR, limiting downstream voltage to ≤72.7 V. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
The SMBJ45C-E3/52 is rated for 100 A non-repetitive forward surge current (IFSM) at 8.3 ms half-sine, supports 0.01 % duty cycle repetitive operation, and exhibits a VBR temperature coefficient of +0.102 %/°C - enabling predictable performance across -55 °C to +150 °C operating range without external thermal compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 45 V - maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 50.0–55.3 V at 1 mA - precise voltage at which device transitions from high- to low-impedance state; ensures consistent triggering |
| VC (Clamping Voltage) | 72.7 V at 8.3 A (10/1000 µs) - maximum voltage seen by protected circuit during surge; determines survivability of downstream ICs |
| PPPM (Peak Pulse Power) | 600 W - energy-handling capacity for standardized transient waveforms; validates suitability for IEC 61000-4-5 Level 3/4 surges |
| IPPM (Peak Pulse Current) | 8.3 A - peak current the device safely diverts during 10/1000 µs surge; directly relates to PCB trace sizing and layout robustness |
| TJmax | +150 °C - maximum junction temperature; enables use in high-ambient environments like motor drives and outdoor telecom equipment |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated reflow assembly |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, RoHS-compliant (E3 suffix), MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VIN > VBR; polarity must match system ground reference |
| Anode | Reference / ground return | Typically tied to system ground plane; forms low-inductance return path essential for effective clamping performance |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates robust protection against lightning-induced surges per IEC 61000-4-5 and ISO 7637-2; eliminates need for cascaded protection stages |
| 72.7 V clamping at 8.3 A | Ensures protected ICs (e.g., 75 V-rated gate drivers) remain within absolute maximum ratings during worst-case transients |
| Glass-passivated junction | Delivers stable VBR over lifetime and temperature; prevents parameter drift after 1000+ surge events |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time); critical for protecting high-speed logic and ADC inputs |
| UL 497B recognized (QVGQ2) | Confirms suitability for telecom interface protection without additional certification effort in end-equipment safety approvals |
Applications
| Industrial Motor Drive Control | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Suppresses inductive kickback from 24 V solenoid valves and relay coils in PLC output modules. IC Role / Device Role: Shunt-clamping TVS placed across coil terminals to limit flyback voltage to <75 V. Use Value: Prevents damage to driving N-channel MOSFETs rated for 80 V VDSS, extending field reliability beyond 100,000 actuation cycles. |
Use Scenario: Protects LIN bus transceiver inputs from load-dump and jump-start transients in door module ECUs. IC Role / Device Role: Unidirectional TVS on LIN data line referenced to battery ground. Use Value: Maintains signal integrity during 12 V system surges up to 40 V/100 ms while meeting ISO 16750-2 requirements. |
| Telecom PoE Power Interface | Consumer Appliance Power Supply Input |
|
Use Scenario: Clamps common-mode surges on IEEE 802.3af/at Ethernet pairs entering PoE-powered switches. IC Role / Device Role: Paired SMBJ45C-E3/52 devices on each pair, cathodes tied to chassis ground. Use Value: Limits differential surge voltage to <75 V, preserving PHY ICs compliant with IEEE 802.3 standard absolute max ratings. |
Use Scenario: Guards AC-DC adapter primary-side rectifier output against mains-borne transients. IC Role / Device Role: TVS placed between bridge rectifier DC+ and bulk capacitor positive terminal. Use Value: Absorbs 600 W surges without degradation, eliminating need for MOV-based secondary protection in Class II isolated designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A-E3/52 | Same VWM/VBR/VC specs, identical SMB package, but unidirectional with cathode band marking - functionally identical to SMBJ45C-E3/52 per Vishay documentation | No functional difference; "A" and "C" suffixes both denote unidirectional configuration in this family | Select SMBJ45C-E3/52 when ordering against legacy design references or BOMs specifying "C" suffix |
| SMCJ45A | Higher 1500 W PPPM, larger SMC (DO-214AB) package (7.11 mm × 6.22 mm), same 45 V VWM and 72.7 V VC | Used where higher surge energy handling is required (e.g., AC mains input), but requires PCB layout change due to larger footprint | Choose SMCJ45A only if system-level testing confirms >600 W surge exposure; otherwise SMBJ45C-E3/52 offers optimal size/power balance |
Compared with SMBJ45A-E3/52, SMBJ45C-E3/52 offers identical electrical performance in the same compact SMB package; versus SMCJ45A, it trades 2.5× lower surge rating for 40 % smaller board area and compatibility with dense automotive and telecom layouts.
Availability
SMBJ45C-E3/52 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, telecom PoE interfaces, and consumer power supply designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ45C-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and high-power handling.
The SMBJ series was developed for surface-mount transient suppression in space-constrained, high-reliability applications - targeting automotive, industrial, and telecom systems where consistent clamping performance and AEC-Q101 qualification matter.
FAQ
What is the polarity configuration of SMBJ45C-E3/52?
The SMBJ45C-E3/52 is a unidirectional TVS diode: its banded end is the cathode, and it conducts only when the anode is more negative than the cathode by ≥VBR. This configuration makes it suitable for DC power rail and single-polarity signal line protection, unlike bidirectional variants (e.g., SMBJ45CA) used for AC or differential lines. The "C" suffix in SMBJ45C-E3/52 explicitly denotes unidirectional polarity per Vishay's naming convention.
Does SMBJ45C-E3/52 meet automotive qualification standards?
The base SMBJ45C-E3/52 is commercial-grade and RoHS-compliant (E3 suffix), but not AEC-Q101 qualified. For automotive applications, Vishay offers the SMBJ45CHE3 variant - identical electrical specs with added AEC-Q101 qualification, halogen-free construction, and extended temperature validation. Engineers must specify SMBJ45CHE3 (not SMBJ45C-E3/52) when automotive-grade reliability is mandated.
What is the maximum clamping voltage of SMBJ45C-E3/52 under surge conditions?
The SMBJ45C-E3/52 has a maximum clamping voltage (VC) of 72.7 V at 8.3 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and represents the highest voltage imposed on the protected circuit during standardized surge testing - critical for ensuring downstream components (e.g., 75 V-rated MOSFETs) remain within safe operating limits.
Can SMBJ45C-E3/52 be used in bidirectional signal lines like RS-485?
No - SMBJ45C-E3/52 is unidirectional and unsuitable for bidirectional data lines. For RS-485, CAN, or other balanced interfaces, a bidirectional TVS such as SMBJ45CA is required, as it clamps symmetrically for both polarities. Using SMBJ45C-E3/52 on such lines would only suppress positive transients and leave negative excursions unprotected, risking receiver damage. Always match TVS polarity to signal topology.
What is the thermal resistance of SMBJ45C-E3/52, and how does it affect layout?
The SMBJ45C-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This means a 1 W steady-state dissipation raises junction temperature by ~100 °C above ambient - emphasizing that the device is intended for transient-only operation. Layout must provide adequate copper area and avoid thermal isolation to prevent exceeding the 150 °C TJmax during repeated surges.
SMBJ45C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- 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)
SMBJ45C-E3/52 FAQ
1.How can I place an order for SMBJ45C-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45C-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 SMBJ45C-E3/52 reliable?
The price and inventory of SMBJ45C-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 SMBJ45C-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ45C-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45C-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45C-E3/52?
SMBJ45C-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45C-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 SMBJ45C-E3/52?
For technical support, including SMBJ45C-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45C-E3/52 requirements.
6.How does Aetrix verify that SMBJ45C-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ45C-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 SMBJ45C-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ45C-E3/52?
All SMBJ45C-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45C-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 SMBJ45C-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ45C-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45C-E3/52 Tags
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