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Vishay General Semiconductor - Diodes Division SMBJ45A-E3/5B
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- Part No.:
- SMBJ45A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45A-E3/5B.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,224
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Product details
Overview
SMBJ45A-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 ESD, lightning-induced surges, and inductive switching transients. It features a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1.0 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.
For engineers reviewing the SMBJ45A-E3/5B datasheet, SMBJ45A-E3/5B pinout, SMBJ45A-E3/5B application, or SMBJ45A-E3/5B equivalent, key selection considerations include its unidirectional polarity, 1.0 µA max reverse leakage at VWM, 150 °C max junction temperature, RoHS-compliant matte tin-plated leads, and suitability for automotive-grade designs when ordered with HE3 suffix.
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 50.0 V minimum breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance under repetitive transient stress.
The SMBJ45A-E3/5B delivers 72.7 V clamping at 8.3 A (10/1000 µs), with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling reliable operation on standard 0.2" × 0.2" copper pads without forced cooling. It meets MSL Level 1 per J-STD-020 and supports automated SMT placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before significant leakage; defines safe signal line operating margin. |
| VBR (min/max) | 50.0 V / 55.3 V at 1.0 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamped voltage seen by protected circuit during 600 W surge; determines downstream IC survivability. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates protection capability against IEC 61000-4-5 Level 4 surges. |
| IR @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; ensures minimal power loss and signal integrity in standby. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 0.205" × 0.130" footprint; compatible with IPC-7351B land patterns. |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to ground or low-side reference; completes clamping path during positive transients. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line; conducts avalanche current when line voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 surge events up to Level 4 (4 kV line-earth) without derating. |
| Glass passivated chip junction | Ensures stable, repeatable avalanche performance over 1000+ transient cycles with <±5% VBR drift. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow soldering without moisture-related popcorning or delamination. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU and JEDEC JESD201 Class 2 whisker resistance requirements. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response time), improving clamping precision. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs, body control modules, and lighting drivers from load dump and ISO 7637-2 pulses. IC Role / Device Role: Unidirectional clamping TVS placed between power rail and chassis ground. Use Value: Limits transient voltage to ≤72.7 V during 600 W surges, preventing damage to 48 V-rated DC-DC controllers and CAN transceivers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules exposed to field wiring transients. IC Role / Device Role: Signal-line TVS on 0–5 V or 0–10 V analog outputs, referenced to system ground. Use Value: Maintains signal integrity with only 1.0 µA leakage at 45 V, while clamping ESD strikes to <73 V to preserve ADC input stage reliability. |
| Telecom DSL Line Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding ADSL/VDSL line interface circuits from lightning-induced surges on twisted-pair telephone lines. IC Role / Device Role: Primary protection device on tip/ring lines, upstream of GDT and secondary TVS stages. Use Value: Fast 1 ns response and 72.7 V clamping prevent latch-up in line-driver ICs during 10/1000 µs surges up to 4 kV. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role: Freewheeling TVS across motor terminals or H-bridge MOSFET drains. Use Value: Absorbs 600 W energy from 100 A IFSM surges without degradation, extending MOSFET lifetime and reducing EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and SMB package. | No functional difference; selected where halogen-free compliance is mandated (e.g., EU public infrastructure). | Choose SMBJ45A-M3/5B when halogen-free materials are required; otherwise SMBJ45A-E3/5B is standard. |
| SMBJ45CA-E3/5B | Bidirectional version; symmetric VBR = 50.0–55.3 V, same VC = 72.7 V, but no polarity marking. | Used in AC-coupled or differential signal lines (e.g., RS-485, USB D+/D−) where bidirectional clamping is needed. | Select SMBJ45CA-E3/5B only for bidirectional signal paths; SMBJ45A-E3/5B is correct for DC power/signal rails. |
Compared with SMBJ45A-M3/5B, the SMBJ45A-E3/5B offers identical surge protection performance with standard RoHS compliance, while SMBJ45CA-E3/5B provides symmetrical clamping essential for AC or differential interfaces-neither is pin-compatible with the other due to polarity and marking differences.
Availability
SMBJ45A-E3/5B is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom line protection, and consumer appliance motor drive circuits requiring stable component supply and long-term obsolescence management.
Supply support for SMBJ45A-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 and AEC-Q qualification.
The SMBJ series was engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness and repeatable clamping performance are critical.
FAQ
What is the maximum clamping voltage of the SMBJ45A-E3/5B under a 10/1000 µs surge?
The SMBJ45A-E3/5B 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 IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on the protected circuit during standardized surge events. The SMBJ45A-E3/5B maintains this clamping performance across its full operating temperature range.
Is the SMBJ45A-E3/5B suitable for automotive applications?
The SMBJ45A-E3/5B is rated for commercial temperature range (–55 °C to +150 °C) and meets MSL Level 1, but it is not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ45AHE3_B variant (with HE3 suffix), which carries AEC-Q101 qualification. The SMBJ45A-E3/5B may be used in non-safety-critical automotive subsystems where qualification is not mandated, but design validation is required.
What does the "E3/5B" suffix indicate in SMBJ45A-E3/5B?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 and JESD 22-B102 solderability standards. The "5B" indicates packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3200 units per reel. This format supports high-volume automated SMT assembly without manual handling.
How does the SMBJ45A-E3/5B differ from the SMBJ45CA-E3/5B?
The SMBJ45A-E3/5B is unidirectional with cathode band marking and optimized for DC power/signal line protection, while the SMBJ45CA-E3/5B is bidirectional with no polarity marking and intended for AC or differential signal paths like RS-485 or USB. Both share identical VBR, VC, and PPPM, but their circuit roles and layout requirements differ fundamentally.
What is the thermal resistance of the SMBJ45A-E3/5B, and how does it affect PCB layout?
The SMBJ45A-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. To maintain safe operation under repeated surges, Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size increases RθJA, risking thermal runaway during high-duty-cycle transients-so the SMBJ45A-E3/5B requires adherence to recommended land pattern dimensions.
SMBJ45A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ45A-E3/5B FAQ
1.How can I place an order for SMBJ45A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45A-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 SMBJ45A-E3/5B reliable?
The price and inventory of SMBJ45A-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 SMBJ45A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ45A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45A-E3/5B?
SMBJ45A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45A-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 SMBJ45A-E3/5B?
For technical support, including SMBJ45A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45A-E3/5B requirements.
6.How does Aetrix verify that SMBJ45A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ45A-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 SMBJ45A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ45A-E3/5B?
All SMBJ45A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45A-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 SMBJ45A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ45A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45A-E3/5B Tags
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