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Vishay General Semiconductor - Diodes Division SMBJ48A-E3/5B
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- Part No.:
- SMBJ48A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48A-E3/5B.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,721
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Product details
Overview
SMBJ48A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode 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 a 10/1000 µs waveform-used to safeguard MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ48A-E3/5B datasheet, SMBJ48A-E3/5B pinout, SMBJ48A-E3/5B application, or SMBJ48A-E3/5B equivalent, key selection criteria include its unidirectional polarity, SMB (DO-214AA) package compatibility with automated SMT assembly, low incremental surge resistance, and AEC-Q101 qualification readiness via HE3/HM3 variants.
Technical Context
This TVS diode operates as a clamping device that remains non-conductive below VWM = 48 V and rapidly transitions to low-impedance conduction when transient voltages exceed VBR (min 53.3 V). Its glass-passivated junction ensures stable avalanche behavior and repeatable clamping performance under repetitive surge conditions.
The device delivers 77.4 V clamping voltage at 7.8 A (10/1000 µs), with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W, enabling effective heat dissipation on standard 5.0 mm × 5.0 mm copper pads. It meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets upper limit for protected circuit DC bias. |
| VBR @ IT = 1 mA | 53.3–58.9 V - Breakdown voltage range defining reliable avalanche initiation threshold under standardized test conditions. |
| VC @ IPPM = 7.8 A | 77.4 V - Clamped voltage during 600 W transient event; determines maximum stress imposed on downstream components. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; defines surge energy absorption capability per event. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inrush or fault currents. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in high-ambient industrial environments with appropriate PCB thermal design. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with JEDEC-compliant pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-potential node; completes clamping path during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., +48 V rail); carries surge current into anode during overvoltage clamp. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against severe transients such as ISO 7637-2 Pulse 1/2a/5a in automotive power systems and IEC 61000-4-5 surges in industrial equipment. |
| 77.4 V clamping voltage at 7.8 A | Limits voltage overshoot across protected ICs or MOSFETs to safe levels during 600 W surge events, reducing risk of gate oxide damage or latch-up. |
| Low profile SMB package (DO-214AA) | Supports high-density PCB layouts and automated placement with industry-standard land pattern; reduces assembly cost versus larger DO-214AB packages. |
| Glass passivated junction | Ensures stable, repeatable avalanche characteristics over lifetime and temperature, critical for long-term reliability in harsh environments. |
| MSL Level 1, 260 °C peak reflow | Allows single-pass lead-free reflow without moisture sensitivity concerns, eliminating bake requirements and streamlining manufacturing. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting 48 V intermediate bus rails in programmable logic controller (PLC) power stages from switching transients and load dump. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between input rail and ground to shunt surge energy away from DC-DC controllers and gate drivers. Use Value: Limits transient voltage to ≤77.4 V, preventing overvoltage failure of 60 V-rated MOSFETs and maintaining system uptime during field-induced surges. |
Use Scenario: Safeguarding LIN bus interface ICs and microcontroller I/O pins in BCMs against ESD and coupled noise from solenoid actuation. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between LIN data line and chassis ground to suppress fast-rising transients while preserving signal integrity. Use Value: Responds in <1 ps to clamp sub-100 ns ESD events, ensuring compliance with ISO 10605 ±25 kV air discharge without disrupting communication timing. |
| Telecom Remote Radio Unit (RRU) | Consumer Smart Home Hub Power Input |
|
Use Scenario: Shielding 48 V PoE-powered RF front-end modules from lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on DC input stage, coordinated with upstream GDT and downstream π-filter for multi-stage surge suppression. Use Value: Absorbs 600 W surge energy without degradation, maintaining >100,000 surge cycles per MIL-STD-883H Method 3015.8. |
Use Scenario: Securing USB-C PD input stage of smart home hubs against user-induced hot-plug transients and adapter mismatch events. IC Role / Device Role / Timing Role: Secondary protection device downstream of primary fuse and common-mode choke, clamping residual overshoot after bulk filtering. Use Value: Provides precise 48 V standoff with <1 µA leakage at rated voltage, minimizing standby power loss while ensuring fast response to 100 V transients. |
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-E3/5B | Bidirectional variant with same VWM = 48 V and VC = 77.4 V, but symmetric clamping in both polarities. | Required for AC-coupled or floating signal lines where reverse polarity transients occur (e.g., RS-485, CAN FD). | Select SMBJ48CA-E3/5B only when bidirectional protection is mandated; unidirectional SMBJ48A-E3/5B offers lower leakage and simpler grounding in DC rail applications. |
| SMCJ48A-E3/57T | Higher-power 1500 W version in larger SMC (DO-214AB) package; identical VWM, VBR, and VC specs but higher IPPM = 19.9 A. | Suitable for systems requiring higher surge margin (e.g., DIN rail power supplies, solar charge controllers) where board space allows larger footprint. | Choose SMCJ48A-E3/57T only if 600 W is insufficient; SMBJ48A-E3/5B provides optimal power density for space-constrained 48 V embedded designs. |
Compared with SMBJ48CA-E3/5B and SMCJ48A-E3/57T, the SMBJ48A-E3/5B delivers best-in-class power density for unidirectional 48 V rail protection, balancing clamping precision, leakage performance, and SMT manufacturability without sacrificing surge rating.
Availability
SMBJ48A-E3/5B is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom remote radio units, and consumer smart home hubs requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMBJ48A-E3/5B 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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMBJ series was developed for high-reliability transient suppression in compact surface-mount formats, targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and automated assembly are essential.
FAQ
What is the maximum clamping voltage of SMBJ48A-E3/5B under surge conditions?
The SMBJ48A-E3/5B has a maximum clamping voltage (VC) of 77.4 V at 7.8 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during standardized surge events. The SMBJ48A-E3/5B maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMBJ48A-E3/5B RoHS-compliant and lead-free compatible?
Yes, SMBJ48A-E3/5B is RoHS-compliant and rated for lead-free reflow soldering with a maximum peak temperature of 260 °C per J-STD-020. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, and it achieves MSL Level 1 moisture sensitivity classification-eliminating pre-bake requirements. The "E3" suffix explicitly denotes commercial-grade RoHS compliance for the SMBJ48A-E3/5B.
How does SMBJ48A-E3/5B differ from SMBJ48CA-E3/5B?
SMBJ48A-E3/5B is unidirectional with cathode-band marking and optimized for DC rail protection, while SMBJ48CA-E3/5B is bidirectional with no polarity marking and symmetric clamping in both directions. The SMBJ48A-E3/5B exhibits lower reverse leakage (<1 µA at 48 V) than the CA variant, making it preferable for low-power standby circuits. Both share identical VWM, VBR, and VC values, but only SMBJ48A-E3/5B supports AEC-Q101 qualification via HE3 suffix variants.
What is the thermal resistance of SMBJ48A-E3/5B and how does it affect layout?
The SMBJ48A-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C under 5.0 W steady-state dissipation, designers must ensure adequate copper area and minimize trace length. The SMBJ48A-E3/5B's low RθJL enables efficient heat transfer to PCB planes through its leads.
Can SMBJ48A-E3/5B be used in automotive applications?
SMBJ48A-E3/5B itself is commercial-grade, but Vishay offers AEC-Q101 qualified versions under HE3 and HM3 suffixes (e.g., SMBJ48AHE3_B/I). These variants undergo stress testing per AEC-Q101 Rev D and are approved for use in automotive body electronics, infotainment power rails, and ADAS sensor interfaces. For production automotive designs, specify SMBJ48AHE3_B/I instead of SMBJ48A-E3/5B to ensure qualification compliance.
SMBJ48A-E3/5B 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-E3/5B FAQ
1.How can I place an order for SMBJ48A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48A-E3/5B 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-E3/5B reliable?
The price and inventory of SMBJ48A-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ48A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48A-E3/5B?
SMBJ48A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48A-E3/5B 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-E3/5B?
For technical support, including SMBJ48A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48A-E3/5B requirements.
6.How does Aetrix verify that SMBJ48A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ48A-E3/5B 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-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ48A-E3/5B?
All SMBJ48A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48A-E3/5B, 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-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ48A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48A-E3/5B Tags
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