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Vishay General Semiconductor - Diodes Division SMBJ45CA-E3/5B
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- Part No.:
- SMBJ45CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CA-E3/5B.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
SMBJ45CA-E3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. 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 a 10/1000 µs waveform - deployed in industrial sensor signal lines, automotive control modules, and telecom interface protection.
For engineers reviewing the SMBJ45CA-E3/5B datasheet, SMBJ45CA-E3/5B pinout, SMBJ45CA-E3/5B application, or SMBJ45CA-E3/5B equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VWM = 1.62), MSL Level 1 moisture sensitivity, and AEC-Q101 qualification eligibility via HE3/HM3 variants - critical for high-reliability embedded systems requiring repeatable surge immunity.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior during positive and negative transients. Its glass-passivated junction ensures stable VBR tolerance (±5%), low incremental surge resistance, and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Figure 2 in the datasheet. Thermal resistance from junction to ambient is 100 °C/W on standard 0.2" × 0.2" copper pads, supporting reliable operation under repetitive surge conditions at ≤0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 50.0 V / 55.3 V at IT = 1 mA - Confirmed bidirectional breakdown range; ensures consistent turn-on across polarity reversals. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 600 W - Peak pulse power handling capability; validates suitability for IEC 61000-4-5 Level 3/4 surge events. |
| IPPM | 8.3 A - Peak pulse current corresponding to VC; used to size PCB trace width and verify layout survivability. |
| TJ max. | 150 °C - Maximum junction temperature; sets thermal design limits for sustained surge repetition or high ambient environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals function identically; connects across protected line-to-line or line-to-ground without orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated surge energy absorption for IEC 61000-4-5 compliance up to 1 kV open-circuit test level. |
| Clamping ratio VC/VWM = 1.62 | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in downstream MOSFETs or ICs. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination. |
| Glass-passivated junction | Ensures long-term parameter stability and low leakage (<1 µA at VWM) across temperature and lifetime. |
| AEC-Q101 qualification path | HE3/HM3 variants support automotive applications including body control modules and ADAS sensor interfaces. |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop sensors and RS-485 transceivers from ESD and load-dump induced transients in factory automation equipment. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed across differential signal pair or supply rail to divert surge current away from precision analog front-end or communication IC. Use Value: Maintains signal integrity by limiting transient voltage to ≤72.7 V, preventing ADC saturation or transceiver latch-up during 1 kV contact ESD events. |
Use Scenario: Safeguarding LIN bus nodes and GPIO-controlled relays in vehicle door modules exposed to battery disconnect spikes and alternator load dump. IC Role / Device Role / Timing Role: Line-to-ground TVS on 12 V supply rail and line-to-line on LIN data lines, absorbing >100 A surge currents per ISO 7637-2 Pulse 5a. Use Value: Enables compliance with automotive EMC requirements while preserving microcontroller reset logic integrity during 120 V/50 ms load dump pulses. |
| Telecom DSL/FTTH Line Card | Consumer Appliance Motor Drive |
Use Scenario: Shielding ADSL/VDSL line drivers and PHY ICs from lightning-induced surges entering via outdoor copper pairs in residential gateway units. IC Role / Device Role / Timing Role: Primary protection device placed at RJ-11 jack input, coordinated with GDT secondary stage to handle multi-kV common-mode transients. Use Value: Limits let-through voltage to <75 V within 1 ns, preventing damage to 3.3 V or 5 V PHY silicon while sustaining >100 surge events per IEC 61000-4-5. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart washing machines and HVAC blowers connected to MCU-based motor controllers. IC Role / Device Role / Timing Role: Snubber-style clamp across motor terminals or H-bridge high-side/low-side FET drains to absorb inductive kickback energy. Use Value: Reduces radiated emissions by clamping flyback voltage to 72.7 V, avoiding MOSFET avalanche stress and extending driver IC lifetime under 100,000+ cycle operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package; same thermal and surge performance. | No functional difference; selected when halogen-free material compliance is mandated by OEM environmental policy. | Choose for green manufacturing programs requiring IEC 61249-2-21 compliance without sacrificing surge rating or footprint. |
| SMAJ45CA-E3/52 | Lower 400 W PPPM, SMA (DO-214AC) package (smaller footprint: 4.57 mm × 2.69 mm), higher RθJA (140 °C/W), lower IPPM (6.2 A). | Reduced surge margin; suitable only for less severe threat environments (e.g., consumer-grade USB ports vs. industrial fieldbus). | Select only when board space is constrained and surge requirements are ≤400 W; not drop-in for 600 W designs. |
Compared with SMBJ45CA-E3/5B, the M3 variant offers identical protection performance with halogen-free construction, while the SMAJ45CA-E3/52 trades 33 % lower pulse power and higher thermal resistance for smaller PCB area - making SMBJ45CA-E3/5B the optimal choice for industrial and automotive applications demanding full 600 W immunity.
Availability
SMBJ45CA-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom line cards, and consumer appliance motor drives requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for SMBJ45CA-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, power efficiency, and application-specific ruggedization.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive electronics, and telecommunications infrastructure where repeatable surge immunity and thermal stability are non-negotiable.
FAQ
What is the clamping voltage of SMBJ45CA-E3/5B at its rated peak pulse current?
The SMBJ45CA-E3/5B has a maximum clamping voltage (VC) of 72.7 V at 8.3 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings. The SMBJ45CA-E3/5B maintains this clamping performance bidirectionally.
Is SMBJ45CA-E3/5B suitable for automotive applications?
SMBJ45CA-E3/5B itself is commercial-grade (RoHS-compliant, MSL Level 1), but Vishay offers AEC-Q101 qualified versions under ordering codes like SMBJ45CAHE3_B/I. These variants undergo extended stress testing for temperature cycling, humidity, and surge endurance - making them appropriate for automotive body electronics. The SMBJ45CA-E3/5B can be used in non-safety-critical automotive prototypes or cost-sensitive modules where formal qualification is not mandated.
How does the bidirectional configuration of SMBJ45CA-E3/5B affect its PCB layout?
The SMBJ45CA-E3/5B has no polarity marking and symmetrical terminals, allowing placement across any two points needing bidirectional protection - such as line-to-line in RS-485 or line-to-ground in DC power rails. No orientation check is required during assembly, simplifying automated placement and eliminating risk of reverse installation. Its SMB (DO-214AA) footprint matches industry-standard pad layouts defined in the datasheet for optimal thermal dissipation.
What is the maximum reverse leakage current of SMBJ45CA-E3/5B at its stand-off voltage?
At VWM = 45 V and TA = 25 °C, the SMBJ45CA-E3/5B exhibits a maximum reverse leakage current (ID) of 1.0 µA. This low leakage ensures minimal power loss in standby mode and prevents false triggering in high-impedance circuits like sensor bias networks or microcontroller wake-up inputs. Leakage remains below 5 µA up to 85 °C ambient per datasheet characterization.
Can SMBJ45CA-E3/5B replace unidirectional TVS diodes in existing designs?
No - SMBJ45CA-E3/5B is strictly bidirectional and cannot substitute for unidirectional TVS diodes (e.g., SMBJ45A) in DC-biased applications like power rail clamping, where cathode-anode polarity must align with system ground reference. Attempting replacement may result in unintended conduction during normal operation. For DC protection, use the unidirectional SMBJ45A-E3/5B; for AC or floating signal lines, SMBJ45CA-E3/5B is the correct choice.
SMBJ45CA-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:
- 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-E3/5B FAQ
1.How can I place an order for SMBJ45CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CA-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 SMBJ45CA-E3/5B reliable?
The price and inventory of SMBJ45CA-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 SMBJ45CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ45CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CA-E3/5B?
SMBJ45CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CA-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 SMBJ45CA-E3/5B?
For technical support, including SMBJ45CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ45CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ45CA-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 SMBJ45CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ45CA-E3/5B?
All SMBJ45CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CA-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 SMBJ45CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ45CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CA-E3/5B Tags
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