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Vishay General Semiconductor - Diodes Division SMBJ45-E3/5B
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- Part No.:
- SMBJ45-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45-E3/5B.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,594
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Product details
Overview
SMBJ45-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 45 V stand-off 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 - deployed in industrial motor drives, automotive body control modules, and industrial sensor interfaces.
For engineers reviewing the SMBJ45-E3/5B datasheet, SMBJ45-E3/5B pinout, SMBJ45-E3/5B application, or SMBJ45-E3/5B equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, RoHS-compliant commercial-grade qualification, and real-world design guidance for ESD and lightning-induced transient suppression in 24–48 V systems.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: it remains high-impedance below VWM = 45 V, then avalanches sharply at VBR = 50.0–55.3 V to limit transient energy. Its low incremental surge resistance ensures stable clamping at VC = 72.7 V under 8.3 A (10/1000 µs), with <0.1 ns response time enabling protection of fast-switching MOSFET gates and microcontroller I/O pins.
Thermally, it exhibits RθJA = 100 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 20 °C/W, supporting continuous 5.0 W power dissipation at TA = 50 °C. The device is rated for TJ = –55 to +150 °C operation and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before leakage exceeds 1.0 µA; defines safe DC rail margin for 48 V nominal systems. |
| VBR @ IT = 1 mA | 50.0–55.3 V - Breakdown threshold range; ensures reliable triggering above system transients but below IC absolute maximum ratings. |
| VC @ IPPM = 8.3 A | 72.7 V - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level during worst-case transients. |
| PPPM | 600 W - Peak pulse power handling capability; supports repeated 8.3 A surges at 0.01% duty cycle without degradation. |
| IFSM | 100 A - Non-repetitive forward surge rating (8.3 ms half-sine); enables survival of inrush or fault currents in power supply inputs. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in under-hood automotive or enclosed industrial enclosures. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, cathode indicated by band marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes shunt path during avalanche conduction. |
| Cathode | High-side connection point | Connected to protected line (e.g., 48 V rail or signal trace); carries full surge current into ground via anode. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 48 V buses without parallel staging. |
| 72.7 V clamping at 8.3 A | Keeps downstream 75 V-rated MOSFETs and 60 V-input regulators within safe operating area during transients. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental compliance requirements with no halogen restrictions; suitable for consumer and industrial production. |
| MSL Level 1, 260 °C reflow peak | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| 100 A IFSM (8.3 ms) | Withstands high-energy inrush events in DC-DC input stages or relay coil snubbing applications without failure. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 48 V DC bus against switching transients from H-bridge MOSFETs and inductive load back-EMF. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed across input capacitor to clamp voltage spikes to ≤72.7 V during turn-off. Use Value: Prevents gate oxide damage to 75 V-rated power MOSFETs and avoids reset events in MCU-based drive controllers. |
Use Scenario: Surge suppression on LIN bus lines and 12 V/24 V power inputs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between supply rail and chassis ground to absorb 10/1000 µs transients up to 600 W. Use Value: Maintains communication integrity during ISO 7637-2 Pulse 5a (load dump) and prevents latch-up in local microcontrollers. |
| Industrial Sensor Interfaces | Telecom Power Supply Inputs |
|
Use Scenario: Input protection for 4–20 mA loop-powered sensors and RS-485 transceivers in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at connector entry point to divert induced lightning surges away from analog front-end ICs. Use Value: Limits clamped voltage to 72.7 V, ensuring internal LDOs and ADC references remain within safe operating limits. |
Use Scenario: Primary-stage transient suppression on AC/DC and DC/DC converter inputs subjected to utility grid surges and capacitor discharge events. IC Role / Device Role / Timing Role: High-power TVS placed after input fuse and before bulk capacitor to absorb repetitive 600 W pulses without thermal runaway. Use Value: Extends electrolytic capacitor life by limiting voltage overshoot and eliminates need for redundant MOV+TVS cascades. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No difference in circuit function or layout; selected where halogen-free material compliance is mandated. | Choose when BOM requires halogen-free certification (IEC 61249-2-21) without altering protection performance. |
| SMBJ45AHM3_B/I | AEC-Q101 qualified, halogen-free, with same VWM, VBR, and VC; rated for automotive under-hood use. | Validated for automotive temperature cycling, vibration, and lifetime reliability testing; not required for commercial use. | Specify only for automotive OEM or Tier-1 designs requiring AEC-Q101 qualification; adds cost without benefit in industrial applications. |
Compared with SMBJ45-E3/5B, the M3/5B variant offers identical protection performance with halogen-free construction, while the HM3_B/I version adds AEC-Q101 qualification for automotive deployment - neither provides pin-to-pin or functional advantage outside their specific compliance scope.
Availability
SMBJ45-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supply inputs requiring stable component supply, consistent RoHS compliance, and proven 600 W surge resilience.
Supply support for SMBJ45-E3/5B 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, power efficiency, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in space-constrained surface-mount applications, targeting industrial, automotive, and telecom systems where robustness and repeatable clamping performance are critical.
FAQ
What is the maximum clamping voltage of SMBJ45-E3/5B under a 10/1000 µs surge?
The SMBJ45-E3/5B has a maximum clamping voltage (VC) of 72.7 V when subjected to an 8.3 A peak pulse current with a 10/1000 µs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88392) and defines the upper voltage limit imposed on protected circuitry during surge events. Designers use this parameter to verify that downstream components - such as 75 V-rated MOSFETs or 60 V-input regulators - remain within their absolute maximum ratings when the SMBJ45-E3/5B activates.
Is SMBJ45-E3/5B suitable for automotive applications?
The SMBJ45-E3/5B is a commercial-grade, RoHS-compliant part and is not AEC-Q101 qualified. While it operates across –55 to +150 °C and meets MSL Level 1, it lacks the extended reliability validation required for automotive under-hood or safety-critical systems. For automotive use, Vishay recommends the SMBJ45AHM3_B/I variant, which carries full AEC-Q101 qualification. The SMBJ45-E3/5B remains appropriate for non-automotive industrial, telecom, and consumer applications where AEC-Q101 is not mandated.
What does the "E3/5B" suffix indicate in SMBJ45-E3/5B?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads, while "5B" specifies packaging in 13-inch diameter plastic tape and reel with a base quantity of 3200 units. This ordering code aligns with Vishay's standardized nomenclature: E3 confirms environmental compliance per EU RoHS Directive 2011/65/EU, and 5B identifies the reel size and quantity format used for automated SMT assembly. No functional or electrical differences exist between E3/5B and other packaging variants like E3/52 (7-inch reel, 750 units).
How does SMBJ45-E3/5B compare to SMAJ45A in terms of surge capability?
The SMBJ45-E3/5B delivers 600 W peak pulse power (10/1000 µs), whereas the SMAJ45A is rated for 400 W under identical conditions. This 50% higher power rating allows the SMBJ45-E3/5B to handle larger surge currents - up to 8.3 A versus 5.5 A for the SMAJ45A - without exceeding its clamping limit. The SMBJ package also offers lower thermal resistance (RθJL = 20 °C/W vs. ~30 °C/W for SMA) and better power dissipation, making SMBJ45-E3/5B preferable in high-reliability or thermally constrained designs where sustained surge exposure is expected.
Can SMBJ45-E3/5B be used in bidirectional protection circuits?
No - SMBJ45-E3/5B is a unidirectional TVS diode, intended for DC rail or polarized signal line protection where reverse voltage is blocked. For bidirectional applications (e.g., AC lines, differential buses like RS-485), Vishay specifies the CA-suffixed variant SMBJ45CA, which exhibits symmetrical clamping in both directions. Using SMBJ45-E3/5B in a bidirectional configuration would result in forward conduction during negative transients, potentially damaging the device or failing to suppress the surge. Always match polarity: unidirectional for DC, bidirectional for AC or floating signals.
SMBJ45-E3/5B 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ45-E3/5B FAQ
1.How can I place an order for SMBJ45-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45-E3/5B 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 SMBJ45-E3/5B reliable?
The price and inventory of SMBJ45-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ45-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45-E3/5B?
SMBJ45-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45-E3/5B 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 SMBJ45-E3/5B?
For technical support, including SMBJ45-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45-E3/5B requirements.
6.How does Aetrix verify that SMBJ45-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ45-E3/5B 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 SMBJ45-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ45-E3/5B?
All SMBJ45-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45-E3/5B, 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 SMBJ45-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ45-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45-E3/5B Tags
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