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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay General Semiconductor - Diodes Division SMBJ45C-E3/5B

Name: SMBJ45C-E3/5B
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMBJ45C-E3/5B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMBJ45C-E3/5B

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-214AA, SMB

Datasheet:: SMBJ45C-E3/5B.pdf

Description:: TVS DIODE 45VWM 80.3VC DO214AA

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Product details

Overview

SMBJ45C-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 45 V stand-off voltage (V_WM), 50.0–55.3 V breakdown voltage (V_BR) at 1 mA, 72.7 V maximum clamping voltage (V_C) at 8.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform.

For engineers reviewing the SMBJ45C-E3/5B datasheet, SMBJ45C-E3/5B pinout, SMBJ45C-E3/5B application, or SMBJ45C-E3/5B equivalent, key selection considerations include its unidirectional polarity, 1.0 µA max reverse leakage at V_WM, 150 °C max junction temperature, RoHS-compliant matte tin-plated terminals, and suitability for I/O line protection in industrial sensor interfaces and automotive ECUs.

Technical Context

This TVS diode operates as a clamping device that remains high-impedance below 45 V and rapidly transitions to low-impedance conduction above its breakdown threshold to divert surge energy away from protected circuitry. Its glass-passivated junction ensures stable performance under repetitive transient stress and meets MSL level 1 per J-STD-020 with 260 °C reflow peak.

The SMBJ45C-E3/5B delivers 72.7 V clamping at 8.3 A (10/1000 µs), exhibits 0.102 %/°C temperature coefficient of V_BR, and maintains ≤1.0 µA reverse leakage at rated V_WM. Its thermal resistance is 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, supporting reliable operation in compact PCB layouts without active cooling.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	45 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe signal line operating margin.
V_BR (min/max)	50.0 V / 55.3 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on during overvoltage events.
V_C @ I_PPM	72.7 V at 8.3 A - Clamping voltage under standardized 10/1000 µs surge; determines maximum stress imposed on downstream ICs.
P_PPM	600 W - Peak pulse power handling capability; supports robust protection against IEC 61000-4-5 Level 3/4 surges.
I_R @ V_WM	≤1.0 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in battery-powered systems.
T_J max	+150 °C - Enables deployment in under-hood automotive and industrial environments with elevated ambient temperatures.
Package	SMB (DO-214AA) - Surface-mount footprint (5.21 mm × 4.06 mm × 2.20 mm) compatible with automated SMT assembly and IPC-7351B land patterns.

Pinout & Package

Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode indicated by band marking on unidirectional devices.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Low-side reference terminal	Connected to ground or common return path; completes conduction path during transient clamping.
Cathode	High-side surge input terminal	Connected to protected line (e.g., CAN_H, RS-485 A); receives surge energy and initiates avalanche breakdown.

Key Features

Feature	Design Value
600 W peak pulse power (10/1000 µs)	Enables single-device protection against severe transients per IEC 61000-4-5 without external series impedance.
Glass passivated junction	Ensures long-term reliability and stable V_BR performance across temperature and lifetime cycling.
MSL Level 1 (260 °C peak)	Supports lead-free reflow assembly without moisture-induced popcorn failure or delamination.
RoHS-compliant, commercial grade	Meets global environmental compliance requirements while maintaining cost-effective production scalability.
Low incremental surge resistance	Minimizes clamping voltage overshoot during fast-rising transients (<1 ns rise time), improving protection margin.

Applications

Industrial Sensor Interface	Automotive Body Control Module
Use Scenario: Protecting analog voltage outputs (0–5 V, 0–10 V) and digital I/O lines of pressure, temperature, and position sensors exposed to relay coil flyback and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and microcontroller ADC input or GPIO, referenced to system ground. Use Value: Limits transient-induced ADC saturation or GPIO latch-up by clamping surges to ≤72.7 V while adding <1.0 µA leakage at 45 V operating point.	Use Scenario: Safeguarding LIN bus transceivers and discrete driver outputs in door modules, seat controllers, and lighting nodes subject to load dump and jump-start conditions. IC Role / Device Role / Timing Role: TVS connected anode-to-ground, cathode-to-LIN line to absorb negative-going spikes and clamp positive transients to 72.7 V. Use Value: Maintains LIN signal integrity during 12 V system transients up to 600 W without degrading data timing or requiring additional filtering components.
Power Supply Input Protection	RS-485 Communication Port
Use Scenario: Secondary overvoltage protection on 48 V DC input rails feeding isolated DC-DC converters in telecom and factory automation equipment. IC Role / Device Role / Timing Role: Placed after primary fuse and upstream of input capacitor to limit surge energy entering converter front-end. Use Value: Absorbs 10/1000 µs surges up to 8.3 A without degradation, reducing risk of MOSFET gate oxide rupture or controller latch-up.	Use Scenario: Line-side transient suppression on RS-485 differential pairs (A/B) in building management and industrial control networks. IC Role / Device Role / Timing Role: One SMBJ45C-E3/5B per line (A-to-GND, B-to-GND), configured as unidirectional clamps to handle asymmetrical surges. Use Value: Prevents receiver damage from ±1 kV EFT bursts by limiting differential and common-mode voltages to safe levels within ISO 11898-2 margins.

Industrial Sensor Interface

Automotive Body Control Module

Use Scenario: Protecting analog voltage outputs (0–5 V, 0–10 V) and digital I/O lines of pressure, temperature, and position sensors exposed to relay coil flyback and ESD.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and microcontroller ADC input or GPIO, referenced to system ground.

Use Value: Limits transient-induced ADC saturation or GPIO latch-up by clamping surges to ≤72.7 V while adding <1.0 µA leakage at 45 V operating point.

Use Scenario: Safeguarding LIN bus transceivers and discrete driver outputs in door modules, seat controllers, and lighting nodes subject to load dump and jump-start conditions.

IC Role / Device Role / Timing Role: TVS connected anode-to-ground, cathode-to-LIN line to absorb negative-going spikes and clamp positive transients to 72.7 V.

Use Value: Maintains LIN signal integrity during 12 V system transients up to 600 W without degrading data timing or requiring additional filtering components.

Power Supply Input Protection

RS-485 Communication Port

Use Scenario: Secondary overvoltage protection on 48 V DC input rails feeding isolated DC-DC converters in telecom and factory automation equipment.

IC Role / Device Role / Timing Role: Placed after primary fuse and upstream of input capacitor to limit surge energy entering converter front-end.

Use Value: Absorbs 10/1000 µs surges up to 8.3 A without degradation, reducing risk of MOSFET gate oxide rupture or controller latch-up.

Use Scenario: Line-side transient suppression on RS-485 differential pairs (A/B) in building management and industrial control networks.

IC Role / Device Role / Timing Role: One SMBJ45C-E3/5B per line (A-to-GND, B-to-GND), configured as unidirectional clamps to handle asymmetrical surges.

Use Value: Prevents receiver damage from ±1 kV EFT bursts by limiting differential and common-mode voltages to safe levels within ISO 11898-2 margins.

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-E3/5B	Identical electrical specs and package; differs only in part suffix convention ('A' vs 'C' denotes same unidirectional variant).	No functional difference; both rated for 45 V V_WM, 72.7 V V_C, and 600 W P_PPM.	Select SMBJ45C-E3/5B when cross-referencing Vishay's official ordering matrix where 'C' suffix is specified for unidirectional SMBJ family.
SMCJ45A	Larger SMC (DO-214AB) package (7.11 mm × 6.22 mm); same V_WM/V_C but higher 1500 W P_PPM rating.	Used where higher surge energy absorption is required; not drop-in due to larger footprint and different pad layout.	Choose SMBJ45C-E3/5B for space-constrained designs needing 600 W protection; select SMCJ45A only if board area permits and >1 kW surge margin is mandatory.

Compared with SMBJ45A-E3/5B, the SMBJ45C-E3/5B offers identical protection performance in the same SMB footprint, while SMCJ45A provides higher power handling at the cost of increased PCB area and thermal mass-making SMBJ45C-E3/5B optimal for miniaturized industrial and automotive modules where layout density is critical.

Availability

SMBJ45C-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and RS-485 communication ports requiring stable component supply, consistent RoHS compliance, and verified surge immunity performance.

Supply support for SMBJ45C-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.

The SMBJ series is engineered for high-energy transient suppression in harsh environments-including automotive, industrial, and telecom-delivering precise clamping, low leakage, and robust reflow survivability in compact surface-mount packages.

FAQ

What is the polarity configuration of SMBJ45C-E3/5B?

The SMBJ45C-E3/5B is a unidirectional transient voltage suppressor diode, with cathode identified by a band marking on the SMB package body. It conducts only in reverse bias during overvoltage events and blocks forward current like a standard rectifier diode. This polarity enables targeted protection of positive-going transients on grounded-reference signal or power lines, and its behavior is fully defined in Vishay's SMBJ5.0A–SMBJ188A datasheet revision 09-Jan-2024.

Does SMBJ45C-E3/5B meet AEC-Q101 qualification?

No, SMBJ45C-E3/5B is a commercial-grade RoHS-compliant part (suffix E3), not AEC-Q101 qualified. For automotive applications requiring qualification, Vishay offers the SMBJ45CHM3_X or SMBJ45CHE3_X variants (with HM3 or HE3 suffixes and revision code), which include full AEC-Q101 stress testing and extended temperature validation. The SMBJ45C-E3/5B remains suitable for non-safety-critical industrial and consumer use cases where qualification is not mandated.

What is the maximum clamping voltage of SMBJ45C-E3/5B under surge conditions?

The SMBJ45C-E3/5B has a maximum clamping voltage (V_C) of 72.7 V at 8.3 A peak pulse current with a 10/1000 µs waveform, as specified in the Vishay SMBJ5.0A–SMBJ188A datasheet. This value represents the upper bound of voltage seen by downstream circuitry during worst-case transient events and is measured under standardized test conditions with proper PCB thermal management (0.2" × 0.2" copper pads per terminal).

Can SMBJ45C-E3/5B be used in bidirectional protection circuits?

No, SMBJ45C-E3/5B is strictly unidirectional and must not be used for bidirectional surge suppression. Bidirectional operation requires the CA-suffixed variant (e.g., SMBJ45CA), which contains two opposing avalanche diodes in series. Using SMBJ45C-E3/5B in a bidirectional configuration would result in forward conduction and potential failure during negative transients. Always match the suffix (A = unidirectional, CA = bidirectional) to the circuit topology.

What is the thermal resistance and derating behavior of SMBJ45C-E3/5B?

The SMBJ45C-E3/5B has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. Its peak pulse power rating derates linearly above 25 °C ambient, dropping to ~50 % at 100 °C and ~25 % at 125 °C per Figure 2 in the Vishay datasheet. Continuous power dissipation is limited to 5.0 W at 50 °C ambient on an infinite heatsink, making it unsuitable for sustained DC overvoltage conditions.

SMBJ45C-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:: -

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-E3/5B FAQ

1.How can I place an order for SMBJ45C-E3/5B through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBJ45C-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 SMBJ45C-E3/5B reliable?

The price and inventory of SMBJ45C-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 SMBJ45C-E3/5B is usually 5 days.

3.What payment methods are accepted for SMBJ45C-E3/5B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45C-E3/5B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBJ45C-E3/5B?

SMBJ45C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBJ45C-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 SMBJ45C-E3/5B?

For technical support, including SMBJ45C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45C-E3/5B requirements.

6.How does Aetrix verify that SMBJ45C-E3/5B is sourced from the original manufacturer or authorized distributors?

All SMBJ45C-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 SMBJ45C-E3/5B meets industry standards.

7.What is the process for return or replacement of SMBJ45C-E3/5B?

All SMBJ45C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45C-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 SMBJ45C-E3/5B part is unused and in its original packaging.

Return procedure for SMBJ45C-E3/5B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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