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Vishay General Semiconductor - Diodes Division SMBJ48A-M3/5B
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- Part No.:
- SMBJ48A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48A-M3/5B.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,679
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Product details
Overview
SMBJ48A-M3/5B 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 range at 1 mA, 77.4 V maximum clamping voltage 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 body control modules, and PoE-powered Ethernet interfaces.
For engineers reviewing the SMBJ48A-M3/5B datasheet, SMBJ48A-M3/5B pinout, SMBJ48A-M3/5B application, or SMBJ48A-M3/5B 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 pad layouts.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert transient energy away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at 48 V).
Rated for 100 A non-repetitive forward surge (8.3 ms half-sine), it supports high-energy transients from inductive switching or ESD events. The SMB package provides mechanical robustness and meets UL 94 V-0 flammability, while M3 suffix confirms halogen-free, RoHS-compliant construction per JESD 201 Class 2 whisker testing.
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 threshold range; ensures reliable triggering above system operating voltage. |
| VC @ IPPM | 77.4 V at 7.8 A - Clamped voltage during 600 W transient; determines maximum stress imposed on protected device. |
| PPPM | 600 W (10/1000 µs) - Peak surge power handling capacity; defines protection level against lightning-induced or load-switching spikes. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; requires minimum 5.0 mm × 5.0 mm copper pad per terminal for rated power dissipation. |
| IFSM | 100 A (8.3 ms half-sine) - Forward surge capability; enables use in DC bus protection where polarity is fixed and surge direction is known. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive or enclosed industrial enclosures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix). Cathode marked by band on body; anode is unmarked end. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage event. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes shunt protection loop. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without derating on standard PCB pads. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 µA) across temperature and lifetime, critical for battery-backed systems. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow soldering without moisture sensitivity concerns or baking requirements. |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance for global industrial and automotive supply chains without compromising surge robustness. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 48 V DC bus against back-EMF spikes from brushed DC motors and solenoid actuation. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between motor driver output and chassis ground. Use Value: Limits transient voltage to ≤77.4 V, preventing gate oxide failure in 60 V-rated MOSFETs and ensuring ASIL-B functional safety margin. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from load dump and jump-start surges. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 12 V supply rail upstream of LDO regulators. Use Value: Withstands 100 A surge (8.3 ms) and clamps to 77.4 V, maintaining regulator input within safe dropout range during ISO 16750-2 tests. |
| Power over Ethernet (PoE) PSE | Industrial PLC Analog Input Modules |
|
Use Scenario: Secondary-side overvoltage protection on 48–57 V PoE power delivery circuits after DC-DC conversion. IC Role / Device Role / Timing Role: Fast-response clamp on isolated 48 V output rail feeding PD interface ICs. Use Value: 77.4 V clamping ensures protected PHY and controller ICs remain below absolute maximum ratings during IEEE 802.3bt surge events. |
Use Scenario: Protecting 24 V sensor supply inputs and 0–10 V analog measurement channels from field wiring transients. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) TVS on signal conditioning front-end before instrumentation amplifier. Use Value: Prevents offset drift and ADC saturation during 1 kV EFT bursts while maintaining <0.1% full-scale error in precision measurement paths. |
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-E3/5B | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial-grade industrial equipment where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and assembly process. |
| SMBJ48CA-M3/5B | Bidirectional variant; symmetric VBR (53.3–58.9 V) and same VC (77.4 V), but no polarity marking. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD) where voltage polarity reverses. | Choose only if bidirectional clamping is needed; not a drop-in replacement for unidirectional DC rail protection. |
Compared with SMBJ48A-E3/5B, the SMBJ48A-M3/5B adds halogen-free compliance without sacrificing surge rating or thermal performance; versus SMBJ48CA-M3/5B, it offers optimized clamping for fixed-polarity DC systems with lower leakage and explicit cathode identification.
Availability
SMBJ48A-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and Power over Ethernet (PoE) power delivery systems requiring stable component supply, long-term lifecycle support, and halogen-free compliance.
Supply support for SMBJ48A-M3/5B 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, efficiency, and application-specific optimization.
The SMBJ series delivers standardized 600 W transient suppression in compact SMB packages, engineered for high-volume industrial, automotive, and telecom applications demanding consistent clamping, low leakage, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of SMBJ48A-M3/5B at its rated peak pulse current?
The SMBJ48A-M3/5B has a maximum clamping voltage (VC) of 77.4 V at its specified peak pulse current (IPPM) of 7.8 A, measured under the standard 10/1000 µs waveform. This value defines the highest voltage seen by downstream components during a 600 W transient event and is confirmed in the Vishay datasheet revision 09-Jan-2024, page 2. The SMBJ48A-M3/5B maintains this clamping performance across its qualified operating temperature range.
Is SMBJ48A-M3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ48A-M3/5B is not AEC-Q101 qualified. It carries the M3 suffix indicating halogen-free and RoHS-compliant commercial-grade construction. For automotive use, Vishay specifies AEC-Q101 variants with HE3 or HM3 suffixes (e.g., SMBJ48AHM3_B/I). The SMBJ48A-M3/5B is rated for -55 °C to +150 °C operating temperature but lacks the extended reliability testing required for automotive qualification.
What does the "M3" suffix mean in SMBJ48A-M3/5B?
The "M3" suffix in SMBJ48A-M3/5B denotes halogen-free, RoHS-compliant construction meeting JESD 201 Class 2 whisker resistance requirements. It distinguishes the part from E3 (RoHS-compliant with brominated flame retardants) and HM3/HE3 (AEC-Q101 qualified variants). The M3 designation applies to both material content and plating - matte tin terminals, UL 94 V-0 molding compound, and full compliance with EU RoHS Directive 2011/65/EU Annex II.
Can SMBJ48A-M3/5B be used in bidirectional signal line protection?
No, SMBJ48A-M3/5B is a unidirectional TVS diode and must not be used on bidirectional lines such as RS-485, CAN, or AC-coupled interfaces. Its cathode band indicates polarity-sensitive operation: it clamps only when the cathode is at higher potential than the anode. For bidirectional protection, the SMBJ48CA-M3/5B variant - with symmetric breakdown in both directions - is required. Using SMBJ48A-M3/5B on bidirectional lines risks failure during negative transients.
What PCB pad layout is recommended for SMBJ48A-M3/5B to achieve full 600 W pulse rating?
To achieve the full 600 W peak pulse power rating, Vishay specifies mounting SMBJ48A-M3/5B on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as defined in the datasheet footnote (2) on page 1. Smaller pads increase thermal resistance and reduce surge capability. The SMBJ48A-M3/5B's RθJA of 100 °C/W assumes this layout; reducing pad area degrades clamping performance and may cause thermal runaway during repetitive surges.
SMBJ48A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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-M3/5B FAQ
1.How can I place an order for SMBJ48A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48A-M3/5B 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 SMBJ48A-M3/5B reliable?
The price and inventory of SMBJ48A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ48A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48A-M3/5B?
SMBJ48A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48A-M3/5B 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 SMBJ48A-M3/5B?
For technical support, including SMBJ48A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48A-M3/5B requirements.
6.How does Aetrix verify that SMBJ48A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ48A-M3/5B 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 SMBJ48A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ48A-M3/5B?
All SMBJ48A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48A-M3/5B, 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 SMBJ48A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ48A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48A-M3/5B Tags
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