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Vishay General Semiconductor - Diodes Division SMBJ40C-E3/5B
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- Part No.:
- SMBJ40C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40C-E3/5B.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,672
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Product details
Overview
SMBJ40C-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ40C-E3/5B datasheet, SMBJ40C-E3/5B pinout, SMBJ40C-E3/5B application, or SMBJ40C-E3/5B equivalent, key selection criteria include clamping voltage margin relative to protected circuit's absolute maximum rating, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a silicon avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold, thereby shunting transient energy to ground. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low incremental surge resistance, enabling consistent clamping performance across repetitive 10/1000 µs surges at 0.01 % duty cycle.
Designed for PCB-level protection, SMBJ40C-E3/5B exhibits fast response time (<1 ps), low leakage (<1.0 µA at VWM), and meets MSL Level 1 per J-STD-020 with peak reflow temperature up to 260 °C. It is not AEC-Q101 qualified (suffix lacks HE3/HM3), and polarity is marked by cathode band for unidirectional operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant conduction begins; sets upper limit for normal circuit operation. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown range defining turn-on threshold under standardized test conditions. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamped voltage during 600 W transient; determines worst-case overvoltage seen by downstream components. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; defines surge energy absorption capability per event. |
| IPPM | 9.3 A - Corresponding peak pulse current at VC; used to size PCB trace width and grounding paths. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; critical for derating above 25 °C ambient. |
| TJ max | +150 °C - Maximum allowable junction temperature; constrains sustained power dissipation and surge repetition rate. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by molded band on one end; anode is opposite terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current toward ground reference when VREV > VBR. |
| Anode (unmarked end) | Reference node | Typically tied to system ground or common return path; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without degradation over rated duty cycle. |
| Glass passivated junction | Ensures stable VBR tolerance (±5 %), low leakage (<1 µA), and long-term reliability under thermal cycling. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow assembly without preconditioning; eliminates moisture-related popcorning risk. |
| RoHS-compliant, halogen-free option available | E3 suffix confirms compliance with EU RoHS Directive 2011/65/EU and JEDEC J-STD-20E material requirements. |
| Low profile SMB package | 0.220" × 0.155" footprint enables high-density layout on space-constrained boards such as telecom modules and motor drives. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
|
Use Scenario: Suppresses load-dump and inductive switching transients on 24 V DC input rails of programmable logic controllers and PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground, clamping spikes within 1 ps to prevent damage to upstream DC-DC converters and microcontrollers. Use Value: Limits transient overvoltage to ≤64.5 V, maintaining safe margin below 75 V absolute maximum rating of typical 24 V-rated power management ICs. |
Use Scenario: Protects LIN bus and sensor analog inputs in BCMs from ESD and battery disconnect transients during vehicle service. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 12 V supply line feeding Hall-effect sensors and window motor drivers, with cathode to rail and anode to ground. Use Value: Withstands 100 A non-repetitive surge (IFSM) and maintains <1 µA leakage at 40 V, ensuring no impact on low-current sensor bias networks. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Interface |
|
Use Scenario: Shields Ethernet PHY power pins and RS-485 transceiver VCC lines from lightning-induced surges in outdoor base station equipment. IC Role / Device Role / Timing Role: Primary clamping device on 3.3 V and 5 V auxiliary rails, coordinated with upstream GDTs and series impedance for multi-stage protection. Use Value: Delivers 64.5 V clamping at 9.3 A while occupying minimal board area (SMB footprint), supporting compact 1 RU line card designs. |
Use Scenario: Guards microcontroller GPIOs and gate driver enable lines against back-EMF from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Localized TVS on motor control PCB near H-bridge ICs, placed directly across supply and ground pins of logic-level drivers. Use Value: Fast response (<1 ps) and low clamping voltage ensure MCU reset circuits remain functional during 8.3 ms half-sine surges up to 100 A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40A-E3/5B | Identical electrical specs and package; differs only in part marking (A vs C suffix denotes unidirectional variant; both are unidirectional). | No functional difference; "C" suffix is Vishay's legacy marking for unidirectional SMBJ devices; "A" is current standard designation. | Select SMBJ40A-E3/5B for new designs to align with latest Vishay documentation and ordering conventions. |
| 1.5SMC40A | Same VWM (40 V), but higher VC (69.4 V at 8.6 A) and larger SMC (DO-214AB) package (0.295" × 0.230"). | Lower power density and less suitable for ultra-compact layouts; better thermal mass for infrequent high-energy surges. | Choose 1.5SMC40A only if board space allows larger footprint and higher clamping voltage is acceptable in system margin analysis. |
Compared with SMBJ40C-E3/5B, SMBJ40A-E3/5B offers identical protection performance in the same compact SMB package, while 1.5SMC40A trades footprint efficiency for higher thermal inertia - making SMBJ40C-E3/5B optimal for space-constrained, high-density transient suppression where clamping voltage headroom is critical.
Availability
SMBJ40C-E3/5B is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom line cards, and consumer appliance motor interfaces requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMBJ40C-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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series targets board-level transient suppression in harsh environments, delivering standardized 600 W surge capability in miniature surface-mount packages for cost-sensitive, high-volume industrial and automotive systems.
FAQ
What is the clamping voltage of SMBJ40C-E3/5B at its rated peak pulse current?
The SMBJ40C-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 standard 10/1000 µs double-exponential waveform. This value defines the highest voltage that will appear across the protected circuit during a full-rated transient event, and it is confirmed in Vishay's datasheet Document Number 88392, page 2.
Is SMBJ40C-E3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ40C-E3/5B is not AEC-Q101 qualified. Its suffix "E3" indicates RoHS-compliant commercial grade only. For automotive use, Vishay specifies AEC-Q101 variants with "HE3" or "HM3" suffixes (e.g., SMBJ40AHE3_B/I). The SMBJ40C-E3/5B lacks the required stress testing and traceability documentation for automotive-grade deployment.
How does the SMBJ40C-E3/5B differ from SMBJ40A-E3/5B?
SMBJ40C-E3/5B and SMBJ40A-E3/5B are functionally identical: same VWM (40 V), VBR (44.4–49.1 V), VC (64.5 V), package (SMB), and electrical ratings. The "C" suffix is a legacy Vishay marking for unidirectional SMBJ devices; "A" is the current standard. Both are unidirectional, and SMBJ40C-E3/5B remains fully interchangeable in existing designs.
What is the thermal resistance of SMBJ40C-E3/5B, and how does it affect layout?
The SMBJ40C-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 requires careful PCB layout: minimum recommended pad area must be maintained, and adjacent heat-generating components should be spaced to avoid exceeding +150 °C maximum junction temperature during repetitive surge events.
Can SMBJ40C-E3/5B be used in bidirectional signal line protection?
No, SMBJ40C-E3/5B is strictly unidirectional and must not be used on AC-coupled or bidirectional signal lines (e.g., USB, CAN, RS-485). For such applications, Vishay specifies bidirectional variants with "CA" suffix (e.g., SMBJ40CA), which feature symmetrical clamping in both polarities. Using SMBJ40C-E3/5B on bidirectional lines risks forward conduction and permanent damage during negative half-cycles.
SMBJ40C-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 8.4A
- 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)
SMBJ40C-E3/5B FAQ
1.How can I place an order for SMBJ40C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40C-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 SMBJ40C-E3/5B reliable?
The price and inventory of SMBJ40C-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 SMBJ40C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ40C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40C-E3/5B?
SMBJ40C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40C-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 SMBJ40C-E3/5B?
For technical support, including SMBJ40C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40C-E3/5B requirements.
6.How does Aetrix verify that SMBJ40C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ40C-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 SMBJ40C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ40C-E3/5B?
All SMBJ40C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40C-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 SMBJ40C-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ40C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40C-E3/5B Tags
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Diodes Incorporated
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Diodes Incorporated
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