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Vishay General Semiconductor - Diodes Division SMBJ40A-E3/5B
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- Part No.:
- SMBJ40A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40A-E3/5B.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:586
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Product details
Overview
SMBJ40A-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 inductive switching transients and lightning-induced surges. It features a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 64.5 V maximum clamping voltage (VC) at 9.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines of industrial sensors and telecom interfaces.
For engineers reviewing the SMBJ40A-E3/5B datasheet, SMBJ40A-E3/5B pinout, SMBJ40A-E3/5B application, or SMBJ40A-E3/5B equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, and RoHS-compliant commercial-grade sourcing details for ESD and surge protection design validation.
Technical Context
The SMBJ40A-E3/5B operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for fast response (<1 ps) to transient overvoltages. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance (Rdyn ≈ 3.7 Ω derived from ΔVC/ΔIPPM).
Thermal performance is defined by RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), enabling reliable operation up to TJ = 150 °C. It meets MSL Level 1 per J-STD-020 and supports reflow soldering with peak temperature up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR @ IT = 1 mA | 44.4–49.1 V - Breakdown voltage range confirming robust avalanche initiation threshold for surge detection. |
| VC @ IPPM = 9.3 A | 64.5 V - Clamped voltage during 10/1000 µs surge; defines worst-case stress on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; determines survivability against IEC 61000-4-5 Level 4 surges. |
| IPPM | 9.3 A - Peak pulse current supported at rated clamping voltage; used to size PCB trace width and layout clearance. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in high-ambient industrial environments without forced cooling. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant (E3 suffix), MSL Level 1, 260 °C reflow compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events only in unidirectional mode. |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 40 V rail); avalanches into conduction when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements for industrial and telecom equipment. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage stress on downstream MOSFETs or interface ICs during transient events. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage current under thermal cycling and humidity exposure. |
| Matte tin-plated leads, J-STD-002 compliant | Guarantees reliable solder wetting and intermetallic formation in automated SMT assembly processes. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets environmental compliance mandates without halogen-free cost premium; suitable for non-automotive volume production. |
Applications
| Industrial Sensor Signal Protection | Telecom Power Rail Clamp |
|---|---|
|
Use Scenario: Protecting 4–20 mA analog output lines of pressure/temperature sensors in factory automation cabinets exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground, clamping transients before they reach op-amp input stages. Use Value: Limits induced voltage to ≤64.5 V during 1 kV/0.5 Ω IEC 61000-4-4 bursts, preserving ADC reference integrity and preventing latch-up. |
Use Scenario: Safeguarding +48 V DC power input of VoIP gateways against lightning-induced surges entering via PoE or external wiring. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main supply rail, coordinated with upstream fuse and secondary LC filtering. Use Value: Absorbs 600 W surge energy within 1 ms, maintaining rail voltage below 65 V to prevent damage to DC-DC controllers and Ethernet PHYs. |
| Automotive Body Control Module (BCM) Input Protection | Consumer Appliance Motor Driver Interface |
|
Use Scenario: Shielding LIN bus input pins and switch sense inputs in BCMs subjected to load dump and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Secondary-level TVS on low-voltage control signals, positioned after primary Zener or polymer-based suppression. Use Value: Responds in <1 ps to clamp spikes up to 100 V, ensuring microcontroller GPIOs remain within absolute maximum ratings during battery disconnect events. |
Use Scenario: Guarding H-bridge gate driver enable lines in washing machine motor control boards against commutation-induced dV/dt coupling. IC Role / Device Role / Timing Role: Localized transient shunt on logic-level control traces adjacent to high-current switching nodes. Use Value: Maintains signal integrity by limiting coupled transients to <65 V, avoiding false triggering or shoot-through in half-bridge drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA-E3/5B | Bidirectional variant with same VWM (40 V), symmetric clamping in both polarities; VBR min/max identical but dual-directional. | Required where AC-coupled or floating signal lines (e.g., RS-485, CAN) need protection without polarity assumptions. | Select SMBJ40CA-E3/5B only when bidirectional clamping is mandated by signal architecture - not a drop-in replacement for unidirectional layouts. |
| SMCJ40A-E3/57T | Same VWM and VBR, but higher PPPM = 1500 W in larger SMC (DO-214AB) package; RθJA = 50 °C/W. | Suitable for higher-energy surge environments (e.g., outdoor telecom enclosures) requiring extended surge endurance beyond 600 W. | Choose SMCJ40A-E3/57T when system-level testing reveals repeated failure of SMBJ40A-E3/5B under repetitive surges - requires PCB footprint change. |
Compared with SMBJ40CA-E3/5B, the SMBJ40A-E3/5B provides polarity-aware clamping ideal for DC rails, while SMCJ40A-E3/57T trades compactness for higher single-pulse energy absorption - selection depends on surge profile severity and board space constraints.
Availability
SMBJ40A-E3/5B is available at Aetrix Electronics and suitable for industrial sensor protection, telecom power rail clamping, and consumer appliance motor interface applications requiring stable component supply across multi-year production cycles.
Supply support for SMBJ40A-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, and protection devices with emphasis on reliability, thermal performance, and automotive qualification.
The SMBJ series targets cost-sensitive, high-volume surge protection needs in industrial, telecom, and consumer systems - engineered for automated placement, JEDEC-compliant reflow, and consistent clamping behavior across temperature.
FAQ
What is the maximum clamping voltage of the SMBJ40A-E3/5B under a 10/1000 µs surge?
The SMBJ40A-E3/5B has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay Document 88392 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for validating margin against downstream IC absolute maximum ratings.
Is the SMBJ40A-E3/5B RoHS-compliant and lead-free?
Yes, the SMBJ40A-E3/5B is RoHS-compliant and lead-free, as confirmed by its "E3" suffix per Vishay's ordering nomenclature. It uses matte tin-plated leads, meets J-STD-002 solderability requirements, and complies with JEDEC JESD201 Class 2 whisker resistance testing - making it suitable for modern lead-free reflow assembly processes.
Can the SMBJ40A-E3/5B be used in automotive applications?
The SMBJ40A-E3/5B is a commercial-grade device and not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ40AHE3_B variant (HE3 suffix), which adds AEC-Q101 qualification and extended temperature validation. The SMBJ40A-E3/5B should only be deployed in non-safety-critical automotive subsystems where qualification is not mandated.
What is the thermal resistance of the SMBJ40A-E3/5B, and how does it affect PCB layout?
The SMBJ40A-E3/5B 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. To maintain TJ ≤ 150 °C at full 5.0 W steady-state dissipation, designers must ensure adequate copper area and avoid thermal bottlenecks - especially important in enclosed industrial enclosures with limited airflow.
How does the SMBJ40A-E3/5B differ from the SMBJ40CA-E3/5B?
The SMBJ40A-E3/5B is unidirectional with cathode-band polarity, clamping only in reverse bias, while the SMBJ40CA-E3/5B is bidirectional and clamps symmetrically for both polarities. Their VWM, VBR, and VC values are identical, but the CA version lacks polarity marking and cannot replace the A version without verifying signal topology - using SMBJ40A-E3/5B on an AC line risks open-circuit failure.
SMBJ40A-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 9.3A
- 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)
SMBJ40A-E3/5B FAQ
1.How can I place an order for SMBJ40A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40A-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 SMBJ40A-E3/5B reliable?
The price and inventory of SMBJ40A-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 SMBJ40A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ40A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40A-E3/5B?
SMBJ40A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40A-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 SMBJ40A-E3/5B?
For technical support, including SMBJ40A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40A-E3/5B requirements.
6.How does Aetrix verify that SMBJ40A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ40A-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 SMBJ40A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ40A-E3/5B?
All SMBJ40A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40A-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 SMBJ40A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ40A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40A-E3/5B Tags
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