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Vishay General Semiconductor - Diodes Division SMBJ40CA-E3/5B
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- Part No.:
- SMBJ40CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CA-E3/5B.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:659
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Product details
Overview
SMBJ40CA-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 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 dissipation with a 10/1000 µs waveform - deployed on power rails and signal lines in industrial sensor interfaces and telecom infrastructure.
For engineers reviewing the SMBJ40CA-E3/5B datasheet, SMBJ40CA-E3/5B pinout, SMBJ40CA-E3/5B application, or SMBJ40CA-E3/5B equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), RoHS-compliant matte tin plating, and AEC-Q101 qualification eligibility - all critical for surge immunity validation in automotive-grade power supply designs and I/O protection circuits.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling single-device protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, while the 100 °C/W junction-to-ambient thermal resistance reflects its reliance on PCB copper pad area (0.2" × 0.2") for effective power dissipation during transient events.
The device responds in <1 ps to ESD and lightning-induced transients, clamping voltages within 64.5 V at 9.3 A (10/1000 µs), and maintains <1.0 µA reverse leakage at 40 V - making it suitable for protecting 3.3 V–48 V systems where minimal leakage and fast response are mandatory for signal integrity preservation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of protected circuit's normal operating range. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown threshold range; ensures reliable conduction onset above system nominal voltage. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamped voltage during 600 W transient; determines maximum stress imposed on downstream ICs during surge. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; quantifies energy absorption capability per transient event. |
| IPPM | 9.3 A - Peak pulse current corresponding to VC; used to size PCB trace width and verify layout survivability under surge. |
| TJ max. | +150 °C - Maximum junction temperature; sets thermal derating boundary for sustained operation in high-ambient environments. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; guides heatsinking and layout decisions. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no band marking required. |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; enables placement flexibility on differential or floating lines. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without cascading failure in 24 V industrial systems. |
| Bidirectional clamping symmetry | Eliminates need for dual unidirectional devices on AC or differential signal paths - reduces BOM count and board space by 50%. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during transients, preserving margin for 3.3 V/5 V logic-level interface ICs downstream. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| RoHS-compliant matte tin plating | Ensures solderability per J-STD-002 and long-term reliability in humid environments without whisker growth (JESD 201 Class 2). |
Applications
| Industrial Sensor Interface | Telecom Line Card Protection |
|---|---|
|
Use Scenario: Protecting RS-485 transceivers and analog sensor front-ends from inductive switching spikes and EFT bursts in factory automation PLCs. IC Role / Device Role: Bidirectional voltage clamp placed across differential bus lines (A/B) and power rails (VCC/GND). Use Value: Limits transient voltage to ≤64.5 V, preventing latch-up or gate oxide damage in ±12 V powered transceivers while maintaining <1 µA leakage at 40 V standby. |
Use Scenario: Safeguarding Ethernet PHYs and PoE injectors against lightning-induced surges on 48 V DC power and data pairs in outdoor base station cabinets. IC Role / Device Role: Primary TVS on DC input and MDI-X signal lines, coordinated with gas discharge tubes for multi-stage protection. Use Value: Absorbs 600 W pulses without degradation, enabling compliance with ITU-T K.20/21 secondary protection requirements for telecom infrastructure. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
|
Use Scenario: Shielding LIN bus nodes and CAN transceiver power supplies from load dump and jump-start transients in 12 V vehicle subsystems. IC Role / Device Role: Bidirectional clamp on VBAT-to-GND rail and LIN signal line, qualified to AEC-Q101 when ordered as HE3 variant. Use Value: Withstands 100 A surge (IFSM) and operates from −55 °C to +150 °C, meeting automotive under-hood thermal and surge durability requirements. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers connected to microcontroller GPIOs. IC Role / Device Role: Clamp across motor terminals and MCU input pins to prevent false triggering or reset due to radiated noise. Use Value: Fast <1 ps response and 64.5 V clamping protect 5 V logic inputs while sustaining repeated 600 W pulses at 0.01% duty cycle. |
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-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No difference in circuit performance; selected where halogen-free materials are mandated by OEM environmental policy. | Choose SMBJ40CA-M3/5B when compliance with IEC 61249-2-21 or JEDEC JS709C is required. |
| SMAJ40CA-E3/5B | Lower 400 W PPPM, higher RθJA (140 °C/W), same VWM/VC but reduced surge margin. | Suitable only for lower-energy threats (e.g., IEC 61000-4-2 ESD); insufficient for IEC 61000-4-5 surge in industrial settings. | Select SMBJ40CA-E3/5B over SMAJ40CA-E3/5B when 600 W surge rating and 100 °C/W thermal performance are design-critical. |
Compared with SMAJ40CA-E3/5B, SMBJ40CA-E3/5B delivers 50% higher surge power handling and superior thermal dissipation, while SMBJ40CA-M3/5B offers identical protection with halogen-free construction - enabling precise material and reliability alignment without compromising clamping performance.
Availability
SMBJ40CA-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line card protection, automotive body control modules, and consumer appliance motor drives requiring stable component supply and full traceability.
Supply support for SMBJ40CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive electronics, and telecom infrastructure where consistent clamping and long-term stability are non-negotiable.
FAQ
What is the clamping voltage of SMBJ40CA-E3/5B at its rated peak pulse current?
The SMBJ40CA-E3/5B has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 9.3 A, measured using the standardized 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during a 600 W transient event and is confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88392. Designers use this parameter to verify safe operating margins for downstream ICs.
Is SMBJ40CA-E3/5B suitable for automotive applications?
SMBJ40CA-E3/5B itself is commercial-grade, but the same die in the SMB package is AEC-Q101 qualified when ordered with the HE3 or HM3 suffix (e.g., SMBJ40CAHE3_B). The SMBJ40CA-E3/5B shares identical electrical characteristics, thermal behavior, and mechanical dimensions with its automotive variants - allowing direct layout reuse. For production automotive use, specify the HE3 version; SMBJ40CA-E3/5B remains ideal for prototyping and non-safety-critical vehicle subsystems.
How does the bidirectional nature of SMBJ40CA-E3/5B affect its placement on a PCB?
The SMBJ40CA-E3/5B has no polarity marking and functions identically in either orientation, simplifying PCB layout for AC-coupled, differential, or floating signal paths. Unlike unidirectional TVS diodes, it requires no attention to cathode band alignment - reducing assembly errors and enabling symmetric placement across bus lines (e.g., RS-485 A/B) or power/GND rails. This symmetry also supports single-device protection of transformer-isolated interfaces without additional routing constraints.
What is the thermal resistance of SMBJ40CA-E3/5B, and how does it impact layout?
SMBJ40CA-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. This value assumes standard FR-4 PCB construction and dictates minimum copper area needed to sustain repetitive surges. Reducing pad size increases RθJA, risking thermal runaway during high-duty-cycle transients - so designers must adhere to Vishay's recommended pad layout to guarantee rated 600 W performance.
Does SMBJ40CA-E3/5B meet any industry surge immunity standards out of the box?
SMBJ40CA-E3/5B is rated for 600 W peak pulse power with a 10/1000 µs waveform - aligning with IEC 61000-4-5 Level 4 (4 kV line-earth) when applied with appropriate system-level coordination (e.g., upstream GDT or PTC). While the device itself is not "certified" to a standard, its clamping voltage (64.5 V), low leakage (<1 µA at 40 V), and fast response (<1 ps) make it a proven solution in designs compliant with IEC 61000-4-4 (EFT), IEC 61000-4-5 (surge), and ISO 7637-2 (automotive transients) when properly integrated.
SMBJ40CA-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):
- 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)
SMBJ40CA-E3/5B FAQ
1.How can I place an order for SMBJ40CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CA-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 SMBJ40CA-E3/5B reliable?
The price and inventory of SMBJ40CA-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 SMBJ40CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ40CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CA-E3/5B?
SMBJ40CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CA-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 SMBJ40CA-E3/5B?
For technical support, including SMBJ40CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ40CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ40CA-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 SMBJ40CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ40CA-E3/5B?
All SMBJ40CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CA-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 SMBJ40CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ40CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CA-E3/5B Tags
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