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Vishay General Semiconductor - Diodes Division SMBJ48-E3/52
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- Part No.:
- SMBJ48-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48-E3/52.pdf
- Description:
- TVS DIODE 48VWM 85.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,849
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Product details
Overview
SMBJ48-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 48 V stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, 77.4 V maximum clamping voltage (VC) at 7.8 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, automotive ECUs, and telecom power supplies.
For engineers reviewing the SMBJ48-E3/52 datasheet, SMBJ48-E3/52 pinout, SMBJ48-E3/52 application, or SMBJ48-E3/52 equivalent, key selection criteria include clamping performance under 7.8 A surge, thermal resistance (RθJA = 100 °C/W), RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 48 V, it avalanches to limit transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design per Vishay's recommended 0.2" × 0.2" layout.
The device sustains non-repetitive 8.3 ms half-sine surges up to 100 A (IFSM) and delivers fast response time (<1.0 ns), enabling protection of sensitive MOSFET gates and microcontroller I/O against inductive switching spikes and ESD events. Polarity is marked by a cathode band; no marking applies to bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's normal DC rail. |
| VBR (min/max) | 53.3 V / 58.9 V at IT = 1 mA - Confirmed breakdown range ensures reliable triggering without premature conduction during ripple or tolerance drift. |
| VC @ IPPM | 77.4 V at 7.8 A - Clamping voltage defines worst-case voltage seen by downstream ICs during a 10/1000 µs transient event. |
| PPPM | 600 W - Peak pulse power handling capacity with 10/1000 µs waveform; determines survivability against lightning-induced surges (IEC 61000-4-5). |
| IPPM | 7.8 A - Peak surge current capability at rated clamping voltage; used to size upstream fusing and trace routing. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; mandates minimum 5.0 mm × 5.0 mm copper pad area per terminal for safe 5.0 W steady-state dissipation. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments with proper thermal design. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by a single band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; grounded or connected to low-impedance return path in TVS configuration. | Connected to system ground or common reference plane to provide low-impedance surge shunt path during overvoltage events. |
| Cathode | Current exit point in forward bias; marked by band; connected to protected line in unidirectional TVS setup. | Attached to the line being protected (e.g., 48 V supply rail); avalanche conduction occurs when cathode-to-anode voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 Level 3 (1 kV/2 kV surge) on 48 V DC systems without external series impedance. |
| Clamping voltage ≤ 77.4 V at 7.8 A | Keeps protected 5 V or 3.3 V logic interfaces safely below absolute maximum ratings even during full-rated surge events. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free reflow profiles without preconditioning, reducing manufacturing complexity and cost. |
| Glass passivated junction | Delivers stable VBR tolerance and <1.0 µA leakage at VWM, critical for low-power always-on circuits and battery-backed systems. |
| RoHS-compliant, halogen-free option available (E3/M3) | Meets global environmental regulations and enables use in automotive and industrial applications requiring strict material compliance. |
Applications
| Industrial Motor Drives | Automotive Engine Control Units |
|---|---|
Use Scenario: Protection of 48 V auxiliary power rails feeding gate drivers and current sensors in BLDC inverters. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 48 V rail and chassis ground to clamp inductive kickback from relay coils and PWM switching noise. Use Value: Limits transient voltage to ≤77.4 V, preventing latch-up or oxide breakdown in SiC MOSFET gate drivers rated for 100 V absolute max. |
Use Scenario: Input protection for LIN bus transceivers and fuel injector drivers exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V/48 V subsystem rails to absorb ISO 7637-2 Pulse 5a (load dump) energy without crowbar action. Use Value: Withstands 600 W surges and maintains <1.0 µA leakage, preserving battery life in always-connected vehicle modules. |
| Telecom Power Supplies | Industrial PLC I/O Modules |
Use Scenario: Secondary-side overvoltage suppression on isolated 48 V DC-DC outputs powering PoE controllers and Ethernet PHYs. IC Role / Device Role / Timing Role: Fast-response clamping device across output rails to prevent damage from reflected transients originating from AC input stage or cable coupling. Use Value: Sub-1 ns response ensures clamping initiates before 3.3 V/5 V logic ICs experience overstress, meeting Telcordia GR-1089-CORE immunity requirements. |
Use Scenario: Protection of analog input channels (e.g., 4–20 mA loops) and digital I/O terminals against field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Point-of-entry TVS on terminal block inputs, paired with series current-limiting resistors to manage energy distribution. Use Value: 77.4 V clamping voltage allows safe interface with 30 V-rated op-amps and ADC front-ends while surviving repeated 1 kV surge tests per IEC 61000-4-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package; same VWM, VBR, VC, and PPPM. | Required where halogen-free materials are mandated (e.g., EU public infrastructure, aerospace wiring standards). | Select SMBJ48A-M3/52 when halogen-free compliance is contractually required; otherwise, SMBJ48-E3/52 offers standard commercial-grade RoHS compliance. |
| SMBJ48CA-E3/52 | Bidirectional version with symmetrical VBR (±53.3–58.9 V); same PPPM and VC, but no polarity marking and double the VWM rating (48 V in both directions). | Suitable for AC-coupled signal lines (e.g., RS-485, CAN FD) or floating DC buses where polarity reversal may occur. | Choose SMBJ48CA-E3/52 only for bidirectional protection needs; unidirectional SMBJ48-E3/52 provides lower leakage and simpler layout for fixed-polarity rails. |
Compared with SMBJ48A-M3/52, SMBJ48-E3/52 trades halogen-free content for broader commercial availability and lower unit cost; versus SMBJ48CA-E3/52, it offers superior leakage control and polarity-specific clamping - critical for 48 V DC power integrity where reverse conduction must be avoided.
Availability
SMBJ48-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive engine control units, and telecom power supplies requiring stable component supply, consistent MSL Level 1 reflow compatibility, and long-term obsolescence management.
Supply support for SMBJ48-E3/52 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 high-power handling.
The SMBJ series is engineered for rugged transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated through proven clamping performance and AEC-Q101 qualification pathways.
FAQ
What is the maximum clamping voltage of SMBJ48-E3/52 and under what test condition?
The SMBJ48-E3/52 has a maximum clamping voltage (VC) of 77.4 V, measured at a peak pulse current (IPPM) of 7.8 A using a 10/1000 µs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88392) and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Is SMBJ48-E3/52 suitable for automotive applications?
SMBJ48-E3/52 is qualified for commercial-grade operation (−55 °C to +150 °C) and meets MSL Level 1 reflow standards, but it is not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ48HE3 variant (AEC-Q101 qualified); SMBJ48-E3/52 may be used in non-safety-critical aftermarket or industrial-adjacent vehicle systems where formal qualification is not mandated.
What does the "E3/52" suffix indicate in SMBJ48-E3/52?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "/52" specifies packaging in 7" diameter plastic tape and reel, with a base quantity of 750 units. This ordering code aligns with Vishay's preferred package coding system and ensures compatibility with standard SMT pick-and-place equipment.
How does SMBJ48-E3/52 differ from SMBJ48A-E3/52?
There is no functional or electrical difference: "SMBJ48-E3/52" and "SMBJ48A-E3/52" refer to the same unidirectional TVS device. The "A" suffix is part of Vishay's standard naming convention for unidirectional variants in the SMBJ family (e.g., SMBJ5.0A, SMBJ6.0A), and is often omitted in distributor listings or internal references without altering specifications.
What PCB layout guidance applies to SMBJ48-E3/52 for optimal thermal performance?
Vishay specifies mounting SMBJ48-E3/52 on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve the rated 100 °C/W thermal resistance. Use internal or external copper planes connected via multiple vias to enhance heat spreading; avoid narrow traces between pads and minimize dielectric thickness under the device to reduce thermal impedance.
SMBJ48-E3/52 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 85.5V
- Current - Peak Pulse (10/1000µs):
- 7A
- 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)
SMBJ48-E3/52 FAQ
1.How can I place an order for SMBJ48-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48-E3/52 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 SMBJ48-E3/52 reliable?
The price and inventory of SMBJ48-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ48-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48-E3/52?
SMBJ48-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48-E3/52 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 SMBJ48-E3/52?
For technical support, including SMBJ48-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48-E3/52 requirements.
6.How does Aetrix verify that SMBJ48-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ48-E3/52 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 SMBJ48-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ48-E3/52?
All SMBJ48-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48-E3/52, 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 SMBJ48-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ48-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48-E3/52 Tags
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