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Vishay General Semiconductor - Diodes Division SMBJ48A-M3/52
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- Part No.:
- SMBJ48A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48A-M3/52.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,918
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Product details
Overview
SMBJ48A-M3/52 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 voltage transients induced by inductive load switching and lightning surges. 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 (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 µs waveform.
For engineers reviewing the SMBJ48A-M3/52 datasheet, SMBJ48A-M3/52 pinout, SMBJ48A-M3/52 application, or SMBJ48A-M3/52 equivalent, key selection criteria include clamping performance under 7.8 A surge, thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for stable avalanche behavior. Its low incremental surge resistance ensures minimal voltage overshoot during fast transients, while the 10/1000 µs waveform rating reflects standardized surge immunity testing per ANSI/IEEE C62.35.
The device is rated for -55 °C to +150 °C operating junction temperature, with derating above 25 °C per Fig. 2 of the datasheet. It meets MSL Level 1 per J-STD-020 and supports reflow soldering up to 260 °C peak, making it suitable for high-reliability commercial applications without automotive qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 77.4 V at 7.8 A - Clamped voltage seen by protected circuit during full-rated 600 W transient, limiting stress on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability with 10/1000 µs waveform, defining surge energy absorption capacity. |
| ID @ VWM | 1.0 µA - Reverse leakage current at 48 V, indicating low standby power loss and minimal signal line loading. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; guides heatsinking requirements. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm max length, 4.06 mm max width, and 2.20 mm max height for compact layout. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode band marking on one end. Matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; carries surge current during clamping event. |
| Cathode | High-side connection point | Connected to protected line (e.g., power rail or signal); marked by band; blocks reverse current until VBR exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 48 V DC rails without derating. |
| 77.4 V clamping voltage at 7.8 A | Keeps protected 48 V systems (e.g., PoE, industrial sensors) within safe operating area of 5 V–12 V interface ICs. |
| Halogen-free, RoHS-compliant (M3) | Meets environmental compliance requirements for export-controlled and green manufacturing programs. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage parameters across temperature and lifetime cycling. |
Applications
| Industrial Power Supply Protection | Automated Test Equipment (ATE) Signal Lines |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power module exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to limit transient voltage to <80 V. Use Value: Prevents damage to upstream DC-DC controllers and downstream 3.3 V/5 V LDOs by clamping 600 W surges within 1 ns response time. |
Use Scenario: Analog sensor signal lines (e.g., 4–20 mA loop inputs) in ATE racks subject to ESD and cable discharge events. IC Role / Device Role / Timing Role: Point-of-entry TVS on each channel, mounted directly at connector, shunting transients to local ground. Use Value: Limits induced voltage to <77.4 V during 8 kV contact ESD (IEC 61000-4-2), preserving ADC accuracy and isolator integrity. |
| Telecom Remote Radio Unit (RRU) Power Interface | Factory Automation Fieldbus Nodes |
Use Scenario: 48 V phantom power feed to remote radio units in outdoor base stations, subjected to lightning-induced surges on long feeder cables. IC Role / Device Role / Timing Role: Primary overvoltage protector on DC input, coordinated with upstream fuse and downstream DC-DC converter. Use Value: Absorbs 10/1000 µs surges up to 600 W without degradation, maintaining uptime in harsh electromagnetic environments. |
Use Scenario: PROFIBUS DP or CAN FD node powered from 24–48 V field bus, requiring immunity to inductive switching noise from solenoid valves. IC Role / Device Role / Timing Role: Rail-to-ground TVS on VCC line adjacent to bus transceiver supply pins. Use Value: Clamps transients to 77.4 V before they exceed absolute maximum ratings of ISO1176 or TJA1055 transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A-E3/52 | Same electrical specs, but RoHS-compliant with lead-free finish (E3 suffix); not halogen-free. | Preferred for non-halogen-restricted commercial designs where cost is prioritized over green material compliance. | Select when halogen-free requirement is absent and standard RoHS suffices. |
| SMBJ48CA-M3/52 | Bidirectional variant; symmetric VBR (53.3–58.9 V) in both directions; no polarity marking. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, Ethernet PHY pairs) where reverse conduction must be supported. | Choose only if bidirectional clamping is needed; not a drop-in replacement for unidirectional use cases. |
Compared with SMBJ48A-M3/52, the E3 variant offers identical surge protection performance with lower material cost but lacks halogen-free certification, while the 48CA-M3 enables AC signal protection at the expense of unnecessary complexity in DC-only applications.
Availability
SMBJ48A-M3/52 is available at Aetrix Electronics and suitable for industrial power supplies, telecom infrastructure, factory automation nodes, and test equipment requiring stable component supply with halogen-free compliance and SMT manufacturability.
Supply support for SMBJ48A-M3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in commercial-grade power and signal lines, targeting robustness, low clamping voltage, and seamless SMT integration without requiring automotive qualification.
FAQ
What is the maximum clamping voltage of SMBJ48A-M3/52 under full-rated surge current?
The SMBJ48A-M3/52 has a maximum clamping voltage (VC) of 77.4 V at 7.8 A peak pulse current (IPPM), measured with a 10/1000 µs waveform. This value defines the highest voltage imposed on the protected circuit during a 600 W transient event, ensuring downstream components like 5 V or 12 V regulators remain within safe operating limits. The SMBJ48A-M3/52 maintains this clamping performance across its specified temperature range and lifetime.
Is SMBJ48A-M3/52 suitable for automotive applications?
No, SMBJ48A-M3/52 is a commercial-grade part with M3 halogen-free RoHS compliance but no AEC-Q101 qualification. For automotive use, Vishay offers the SMBJ48AHM3_X variant (e.g., SMBJ48AHM3_B/H), which includes AEC-Q101 qualification, extended temperature validation, and automotive-specific traceability. The SMBJ48A-M3/52 is intended for industrial, telecom, and computing applications where AEC-Q101 is not mandated.
How does the M3 suffix affect the SMBJ48A-M3/52's material composition and compliance?
The M3 suffix indicates the SMBJ48A-M3/52 is halogen-free, RoHS-compliant, and qualified to JESD201 Class 2 whisker resistance. It uses molding compounds and plating materials free of chlorine and bromine, meeting stringent environmental requirements for export and green manufacturing. This differs from the E3 suffix (RoHS-compliant but not halogen-free) and ensures compatibility with IPC-1752A reporting and EU RoHS Annex II updates.
What is the thermal resistance of SMBJ48A-M3/52, and how does it impact PCB layout?
The SMBJ48A-M3/52 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 minimal copper area; increasing pad size or adding internal ground planes reduces RθJA, improving surge endurance. For repeated surge events, thermal design must ensure junction temperature stays below 150 °C, especially above 25 °C ambient, per Fig. 2 derating curve in the datasheet.
Can SMBJ48A-M3/52 be used in bidirectional signal protection?
No - SMBJ48A-M3/52 is strictly unidirectional, with cathode-band polarity marking and asymmetric conduction: it blocks reverse voltage up to 48 V and clamps only when forward-biased beyond VBR. For bidirectional protection (e.g., RS-485, USB, or AC lines), the SMBJ48CA-M3/52 variant must be used. Substituting SMBJ48A-M3/52 in bidirectional roles risks catastrophic failure due to reverse conduction beyond VWM.
SMBJ48A-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ48A-M3/52 FAQ
1.How can I place an order for SMBJ48A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48A-M3/52 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 SMBJ48A-M3/52 reliable?
The price and inventory of SMBJ48A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ48A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48A-M3/52?
SMBJ48A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48A-M3/52 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 SMBJ48A-M3/52?
For technical support, including SMBJ48A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48A-M3/52 requirements.
6.How does Aetrix verify that SMBJ48A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ48A-M3/52 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 SMBJ48A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ48A-M3/52?
All SMBJ48A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48A-M3/52, 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 SMBJ48A-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ48A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48A-M3/52 Tags
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