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Vishay General Semiconductor - Diodes Division SMBJ48CA-E3/51
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- Part No.:
- SMBJ48CA-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CA-E3/51.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,005
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Product details
Overview
SMBJ48CA-E3/51 from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMBJ) package, designed for clamping voltage transients on power and signal lines. It features 48 V stand-off voltage (VWM), 77.4 V maximum clamping voltage (VC) at 7.8 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ48CA-E3/51 datasheet, SMBJ48CA-E3/51 pinout, SMBJ48CA-E3/51 application, or SMBJ48CA-E3/51 equivalent, key selection considerations include bi-directional surge clamping capability, AEC-Q101 qualification, RoHS-compliant matte tin terminations, and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This bi-directional TVS diode operates symmetrically across both polarities, with breakdown voltage (VBR) specified between 53.3 V and 58.9 V at 1 mA test current. Its clamping behavior is defined per ANSI/IEEE C62.35, delivering consistent protection against ESD, lightning-induced surges, and inductive switching transients without polarity dependence.
Designed for surface-mount automation, it uses glass-passivated junction technology and meets MSL Level 1 (260 °C reflow peak). Junction temperature range spans −55 °C to +150 °C, and it supports repetitive surge duty cycle of 0.01 % with derating above 25 °C ambient per Fig. 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse stand-off voltage before clamping begins |
| VBR min / max | 53.3 V / 58.9 V - breakdown occurs within this range at 1 mA, ensuring reliable turn-on margin |
| VC @ IPPM | 77.4 V at 7.8 A - clamping voltage during 10/1000 μs surge, limiting downstream stress |
| PPPM | 600 W - peak pulse power handling with standardized waveform, defining transient energy capacity |
| ID @ VWM | 1.0 μA - low leakage ensures minimal standby power loss and signal integrity |
| TJ max | +150 °C - maximum junction temperature enabling operation in high-ambient industrial environments |
| RθJA | 100 °C/W - thermal resistance to ambient on 0.2" × 0.2" copper pads, guiding heatsinking requirements |
Pinout & Package
DO-214AA (SMBJ) package: surface-mount, low-profile, bi-directional device with no polarity marking; cathode band absent per specification for CA-suffix parts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge path | No functional distinction - terminals interchangeable; conducts identically in either direction during overvoltage events |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides mechanical anchoring and contributes to thermal dissipation via PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-line) without degradation |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass passivated junction | Improves long-term stability and moisture resistance versus epoxy-passivated alternatives |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning or special handling |
| RoHS-compliant matte tin leads | Ensures solderability per J-STD-002 and whisker resistance per JESD 201 Class 1A |
Applications
| Industrial Power Supply Protection | Automotive Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V DC input rails in programmable logic controllers (PLCs) and motor drives from load dump and inductive kickback. IC Role / Device Role / Timing Role: Bi-directional clamping element placed across input terminals to limit transient voltage excursions. Use Value: Limits voltage to ≤77.4 V during 600 W surges, preventing damage to upstream DC-DC controllers and downstream microcontrollers. |
Use Scenario: Safeguarding CAN and LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) in engine control units. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed differential across signal lines or common-mode across supply/ground. Use Value: Maintains signal integrity by clamping ESD (IEC 61000-4-2 ±15 kV) and burst noise while adding <1 pF parasitic capacitance. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHYs and PoE injectors from lightning-induced surges on RJ45 ports and auxiliary power feeds. IC Role / Device Role / Timing Role: Primary-level bi-directional TVS on secondary-side DC outputs and data line pairs. Use Value: Withstands 10/1000 μs surges up to 7.8 A while maintaining 48 V system compatibility and fast response (<1 ns). |
Use Scenario: Protecting gate drivers and MCU I/O in smart washing machine inverters exposed to relay bounce and brush-commutator noise. IC Role / Device Role / Timing Role: Localized clamping device across half-bridge supply rails and feedback sensing nodes. Use Value: Prevents latch-up and gate oxide failure in 600 V MOSFETs by clamping transients before they exceed 80 V absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ48CA | Same DO-214AC (SMA) package; lower PPPM (400 W); higher RθJA (140 °C/W) | Lower surge energy handling; less suitable for repeated industrial transients | Select when cost sensitivity outweighs 600 W requirement and board space allows larger footprint |
| ON Semiconductor SMCJ48CA | DO-214AB (SMC) package; same 600 W rating; higher VC (80.3 V); 2× footprint area | Higher clamping voltage increases risk to 5 V-tolerant receivers; requires larger PCB real estate | Prefer only if legacy SMC layout exists and 80.3 V clamping is acceptable for protected circuitry |
Compared with SMBJ48CA-E3/51, SMAJ48CA offers smaller size but reduced surge margin, while SMCJ48CA delivers equal power rating at higher clamping voltage and larger footprint - making SMBJ48CA-E3/51 the optimal balance of compactness, clamping performance, and thermal capability for new 48 V designs.
Availability
SMBJ48CA-E3/51 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor modules, telecom line cards, and consumer appliance motor controls requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ48CA-E3/51 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, efficiency, and application-specific validation.
The SMBJ series was engineered for high-energy transient suppression in space-constrained, high-reliability applications - particularly where bi-directional clamping, AEC-Q101 compliance, and automated assembly are mandatory.
FAQ
What is the clamping voltage of SMBJ48CA-E3/51 under standard surge conditions?
The SMBJ48CA-E3/51 exhibits a maximum clamping voltage (VC) of 77.4 V when subjected to its rated peak pulse current (IPPM) of 7.8 A using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is SMBJ48CA-E3/51 suitable for automotive applications?
Yes, SMBJ48CA-E3/51 is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. The qualification covers stress tests such as temperature cycling, highly accelerated life testing (HALT), and ESD robustness - validating reliability under vehicle environmental conditions.
Does SMBJ48CA-E3/51 have polarity markings?
No, SMBJ48CA-E3/51 is a bi-directional TVS diode and carries no polarity marking - consistent with the CA suffix designation. Its symmetrical construction means either terminal may serve as anode or cathode depending on transient polarity, eliminating orientation concerns during placement and simplifying PCB layout.
What is the thermal resistance of SMBJ48CA-E3/51, and how does it affect layout?
SMBJ48CA-E3/51 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 JEDEC layout; reducing thermal resistance requires increasing copper area or adding thermal vias - essential for sustaining repetitive surge duty cycles in enclosed enclosures.
How does SMBJ48CA-E3/51 differ from uni-directional SMBJ48A variants?
Unlike the uni-directional SMBJ48A, SMBJ48CA-E3/51 provides symmetrical clamping in both directions with no cathode band marking. It supports AC-coupled or floating signal lines and eliminates polarity-dependent failure modes - making it preferred for differential buses, transformer-isolated supplies, and bidirectional data lines where voltage reversal is possible.
SMBJ48CA-E3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMBJ48CA-E3/51 FAQ
1.How can I place an order for SMBJ48CA-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CA-E3/51 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 SMBJ48CA-E3/51 reliable?
The price and inventory of SMBJ48CA-E3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48CA-E3/51 is usually 5 days.
3.What payment methods are accepted for SMBJ48CA-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CA-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CA-E3/51?
SMBJ48CA-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CA-E3/51 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 SMBJ48CA-E3/51?
For technical support, including SMBJ48CA-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CA-E3/51 requirements.
6.How does Aetrix verify that SMBJ48CA-E3/51 is sourced from the original manufacturer or authorized distributors?
All SMBJ48CA-E3/51 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 SMBJ48CA-E3/51 meets industry standards.
7.What is the process for return or replacement of SMBJ48CA-E3/51?
All SMBJ48CA-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CA-E3/51, 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 SMBJ48CA-E3/51 part is unused and in its original packaging.
Return procedure for SMBJ48CA-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48CA-E3/51 Tags
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