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Vishay General Semiconductor - Diodes Division SMBJ48CD-M3/I
- Part No.:
- SMBJ48CD-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CD-M3/I.pdf
- Description:
- TVS DIODE 48VWM 76.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,113
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Product details
Overview
SMBJ48CD-M3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, with 48 V stand-off voltage (VWM), 54.1–58.1 V breakdown voltage (VBR) at 1 mA, 76.3 V maximum clamping voltage (VC) at 7.9 A peak pulse current, and 600 W peak pulse power rating per 10/1000 μs waveform - designed for robust overvoltage protection of DC power rails and bidirectional signal lines in industrial sensor interfaces.
For engineers reviewing the SMBJ48CD-M3/I datasheet, SMBJ48CD-M3/I pinout, SMBJ48CD-M3/I application, or SMBJ48CD-M3/I equivalent, key selection criteria include bidirectional clamping symmetry, ±3.5 % VBR tolerance, low 0.5 μA reverse leakage at VWM, M3 halogen-free RoHS-compliant construction, and compatibility with automated SMT placement on standard SMB pad layouts.
Technical Context
This device operates as a voltage-clamped surge protector: under normal conditions it presents high impedance (>1 GΩ) up to 48 V; when transient voltage exceeds VBR (54.1–58.1 V), it avalanches rapidly (<1 ns response) to limit downstream voltage to ≤76.3 V at 7.9 A. Its bidirectional structure enables symmetric clamping across both polarities without external polarity management.
Thermal design relies on junction-to-ambient thermal resistance of 125 °C/W (on minimum pad) and 100 °C/W (on 5 mm × 5 mm copper), supporting continuous power dissipation of 1.0 W at 25 °C ambient and derated to 5.0 W at case temperature TM = 50 °C - requiring careful PCB copper area allocation for sustained surge handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum steady-state reverse voltage before significant leakage; defines safe operating window for protected circuit |
| VBR min/max | 54.1 V / 58.1 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | 76.3 V at 7.9 A - clamping voltage during 10/1000 μs surge; determines worst-case stress on downstream ICs |
| PPPM | 600 W - peak transient power handling capability; validates protection against IEC 61000-4-5 Level 4 surges |
| ID @ VWM | 0.5 μA - ultra-low leakage preserves battery life and avoids false triggering in high-impedance circuits |
| TJ max | 150 °C - maximum junction temperature; sets upper limit for thermal design margin under repeated surges |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 2.20 mm height and 5.59 mm length; compatible with J-STD-020 MSL level 1 reflow |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking - symmetrical terminals function identically for either direction of transient suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Either terminal accepts surge current in either polarity; no cathode band; bidirectional conduction eliminates orientation constraints during placement |
| Case (cathode side in unidirectional variants) | Thermal path | Exposed metal slug provides primary heat conduction to PCB copper; requires minimum 5.0 mm × 5.0 mm thermal pad for rated 5.0 W dissipation |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise coordination with system overvoltage thresholds without guard-banding; reduces need for margin-based derating |
| 600 W PPPM (10/1000 μs) | Validates protection against severe lightning-induced transients per IEC 61000-4-5 Ed. 3, including repetitive 0.01 % duty cycle events |
| M3 suffix compliance | Halogen-free, RoHS-compliant, and JESD 201 Class 2 whisker-resistant - qualified for industrial-grade reliability and lead-free assembly |
| MSL Level 1 | Allows unlimited floor life and single-reflow processing at peak 260 °C - eliminates baking requirements and streamlines manufacturing |
| Low 0.5 μA ID at VWM | Minimizes standby power loss in always-on systems (e.g., IoT sensors, remote monitors) without compromising clamping speed |
Applications
| Industrial Sensor Interface | DC Power Rail Protection |
|---|---|
Use Scenario: Protecting 4–20 mA analog output lines of pressure/temperature transmitters exposed to motor drive switching noise and field wiring inductive kick. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal pair to clamp common-mode and differential transients before they reach ADC input or isolation barrier. Use Value: Symmetric 76.3 V clamping prevents saturation of precision op-amps and maintains <0.1 % full-scale error during 1 kV/500 A surge events. | Use Scenario: Safeguarding 48 V DC input stage of programmable logic controller (PLC) power supply against load dump and hot-swap transients. IC Role / Device Role / Timing Role: Primary front-end surge suppressor mounted directly at connector entry point, shunting energy before bulk capacitance. Use Value: 600 W rating handles 10/1000 μs surges up to 7.9 A while maintaining <1 ns response - limiting rail overshoot to <80 V and preventing MOSFET gate oxide failure. |
| Telecom Line Card Protection | Automotive Body Control Module |
Use Scenario: Shielding RS-485 communication ports on base station line cards from induced surges due to nearby AC power routing and lightning coupling. IC Role / Device Role / Timing Role: Bidirectional TVS across differential pair (A/B) and to ground, forming low-inductance clamp network with minimal parasitic capacitance. Use Value: 76.3 V clamping ensures receiver inputs remain within common-mode range (−7 V to +12 V) even during 4 kV EFT bursts, preserving data integrity. | Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins in body control modules subjected to ISO 7637-2 Pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Secondary-level TVS on LIN line, coordinated with upstream fuse and primary suppressor to meet automotive EMC immunity requirements. Use Value: Tight VBR tolerance (±3.5 %) allows accurate alignment with LIN physical layer's 40 V absolute maximum rating, avoiding premature conduction during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA-E3/52 (Vishay) | Same VWM/VBR/VC specs; differs only in packaging (tape-and-reel vs. bulk) and M3 vs. E3 suffix - both RoHS/halogen-free, MSL level 1 | No functional difference; E3 suffix denotes Vishay's standard RoHS-compliant variant with identical electrical and thermal performance | Select SMBJ48CA-E3/52 only if procurement requires Vishay's legacy E3 packaging code or distributor-specific inventory alignment |
| 1.5SMC47CA (ON Semiconductor) | Same SMB package, 47 V VWM, 52.2–57.7 V VBR, 77 V VC - slightly lower VWM and tighter VBR range but 1.5 kW peak power rating (10/1000 μs) | Higher PPPM supports more severe surge environments; however, 1.5SMC47CA has higher thermal resistance (150 °C/W) and requires larger thermal pad for equivalent steady-state dissipation | Choose 1.5SMC47CA where surge severity exceeds 600 W but board space permits larger copper area; otherwise SMBJ48CD-M3/I offers better thermal efficiency per mm² PCB area |
Compared with SMBJ48CA-E3/52, SMBJ48CD-M3/I offers identical protection performance with M3-specific whisker resistance and optimized tape-and-reel delivery for high-volume SMT lines; versus 1.5SMC47CA, it trades peak power headroom for superior thermal management on constrained layouts.
Availability
SMBJ48CD-M3/I is available at Aetrix Electronics and suitable for industrial sensor interface, DC power rail protection, and telecom line card applications requiring stable component supply, long-term lifecycle support, and guaranteed M3-compliant manufacturing traceability.
Supply support for SMBJ48CD-M3/I 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 industrial-grade qualification.
The SMBJ series was engineered specifically for high-reliability transient suppression in harsh environments - targeting applications demanding tight VBR tolerance, low leakage, and repeatable clamping performance across temperature and lifetime.
FAQ
What does the "CD" suffix indicate in SMBJ48CD-M3/I?
The "CD" suffix in SMBJ48CD-M3/I denotes a bidirectional Transient Voltage Suppressor. Unlike unidirectional variants (e.g., SMBJ48D), this device clamps transients equally in both polarities without requiring cathode orientation during PCB placement - essential for protecting AC-coupled or differential signal paths where voltage polarity reverses.
Is SMBJ48CD-M3/I suitable for IEC 61000-4-5 surge testing?
Yes, SMBJ48CD-M3/I is rated for 600 W peak pulse power with a 10/1000 μs waveform - directly supporting Level 4 (4 kV line-earth, 2 kV line-line) compliance per IEC 61000-4-5 when implemented with appropriate PCB layout (e.g., short traces, low-inductance grounding, and adequate copper pour). Its 76.3 V clamping voltage ensures downstream components remain within safe operating limits during test pulses.
How does the M3 suffix affect SMBJ48CD-M3/I's manufacturability?
The M3 suffix certifies SMBJ48CD-M3/I as halogen-free, RoHS-compliant, and qualified to JESD 201 Class 2 for tin whisker resistance - enabling reliable lead-free reflow soldering at 260 °C peak without post-assembly whisker growth risk. It also meets MSL Level 1 per J-STD-020, eliminating moisture sensitivity concerns and allowing indefinite dry-pack storage prior to assembly.
What is the maximum continuous power dissipation for SMBJ48CD-M3/I at 70 °C ambient?
At 70 °C ambient, SMBJ48CD-M3/I's power dissipation must be derated from its 1.0 W rating at 25 °C using the thermal resistance RθJA = 125 °C/W. The allowable PD is calculated as 1.0 W × (150 °C − 70 °C) / (150 °C − 25 °C) ≈ 0.64 W - confirming that sustained operation above 0.64 W requires enhanced thermal management (e.g., larger copper area or forced air cooling).
Can SMBJ48CD-M3/I replace unidirectional SMBJ48D in existing designs?
No - SMBJ48CD-M3/I cannot directly replace unidirectional SMBJ48D without circuit review. While both share identical VWM, VBR, and VC ratings, the bidirectional nature of SMBJ48CD-M3/I eliminates polarity dependence but introduces symmetric leakage in both directions. In DC-biased applications (e.g., 48 V rail to ground), this may increase standby current or interfere with fault detection schemes relying on unidirectional blocking behavior.
SMBJ48CD-M3/I 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):
- 48V
- Voltage - Breakdown (Min):
- 54.1V
- Voltage - Clamping (Max) @ Ipp:
- 76.3V
- Current - Peak Pulse (10/1000µs):
- 7.9A
- 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)
SMBJ48CD-M3/I FAQ
1.How can I place an order for SMBJ48CD-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CD-M3/I 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 SMBJ48CD-M3/I reliable?
The price and inventory of SMBJ48CD-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48CD-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ48CD-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CD-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CD-M3/I?
SMBJ48CD-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CD-M3/I 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 SMBJ48CD-M3/I?
For technical support, including SMBJ48CD-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CD-M3/I requirements.
6.How does Aetrix verify that SMBJ48CD-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ48CD-M3/I 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 SMBJ48CD-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ48CD-M3/I?
All SMBJ48CD-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CD-M3/I, 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 SMBJ48CD-M3/I part is unused and in its original packaging.
Return procedure for SMBJ48CD-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48CD-M3/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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