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Vishay General Semiconductor - Diodes Division SMBJ48A-E3/52
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- Part No.:
- SMBJ48A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48A-E3/52.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,653
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Product details
Overview
SMBJ48A-E3/52 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 standoff voltage (VWM), 53.3–58.9 V breakdown range at 1 mA, clamps transients to ≤77.4 V at 7.8 A peak pulse current (10/1000 µs), and delivers 600 W peak pulse power - deployed in industrial motor drives, telecom power supplies, and automotive body control modules.
For engineers reviewing the SMBJ48A-E3/52 datasheet, SMBJ48A-E3/52 pinout, SMBJ48A-E3/52 application, or SMBJ48A-E3/52 equivalent, this page provides verified package mapping (SMB/DO-214AA), confirmed unidirectional polarity with cathode band marking, clamping performance under standardized surge waveforms, and direct alternatives qualified for similar DC rail protection roles.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse-biased voltage exceeds VBR, it avalanches into low-impedance conduction, diverting surge current away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive transients.
Designed for automated SMT assembly on standard PCBs, SMBJ48A-E3/52 meets J-STD-020 MSL Level 1 (260 °C peak reflow), supports 100 A non-repetitive forward surge (8.3 ms half-sine), and exhibits a low 0.103 %/°C temperature coefficient of VBR - critical for stable clamping across -55 °C to +150 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 48 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin. |
| VBR (Breakdown Voltage) | 53.3–58.9 V at 1 mA - precise avalanche initiation threshold ensuring predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | ≤77.4 V at IPPM = 7.8 A (10/1000 µs) - limits protected circuit voltage stress during worst-case surge. |
| PPPM (Peak Pulse Power) | 600 W - energy-handling capacity for standardized lightning/surge immunity per IEC 61000-4-5. |
| IPPM (Peak Pulse Current) | 7.8 A (10/1000 µs waveform) - quantifies maximum transient current safely diverted without failure. |
| RθJA (Thermal Resistance) | 100 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating above 25 °C. |
| TJmax | +150 °C - maximum allowable junction temperature; enables operation in high-ambient industrial environments. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002. Cathode identified by a single band on the case end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry / reverse surge return path | Connected to system ground or low-side reference; completes clamping loop during transient events. |
| Cathode (banded end) | Reverse voltage sensing / avalanche conduction node | Connected to protected line (e.g., 48 V rail); initiates clamping when voltage exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 Level 4 (4 kV line-to-line) when properly laid out with low-inductance paths. |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| MSL Level 1 rating (260 °C peak) | Supports lead-free reflow without popcorn cracking or delamination - no pre-baking required. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time), improving protection margin. |
| AEC-Q101 qualification option (HE3 suffix) | Validated for automotive under-hood applications requiring extended temperature and lifetime reliability. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of 48 V DC bus against switching transients from IGBT gate drivers and relay coils. IC Role / Device Role / Timing Role: Shunt clamping device placed directly across bus input terminals, triggered within <1 ns of overvoltage onset. Use Value: Limits bus voltage excursion to ≤77.4 V during 7.8 A surges, preventing damage to isolated DC/DC controllers and current-sense amplifiers. |
Use Scenario: Input-stage surge suppression on AC/DC front-end rectified outputs feeding PoE injectors and baseband processors. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side 48 V distribution rail, coordinated with upstream MOVs. Use Value: Maintains VWM = 48 V margin while clamping lightning-induced surges per IEC 61000-4-5, preserving hold-up capacitor integrity. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
|
Use Scenario: Protection of LIN/CAN transceiver power pins and microcontroller I/O against load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS on 5 V or 12 V auxiliary rails, leveraging low VC to avoid brownout during clamping. Use Value: Clamps 12 V rail transients to ≤23.2 V (for SMBJ12A) or scales linearly - SMBJ48A-E3/52 used on higher-voltage subsystems like HVAC actuators. |
Use Scenario: Shielding analog sensor inputs (e.g., 4–20 mA loops, RTD bridges) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) shunt protector placed at connector interface, ahead of instrumentation amplifier. Use Value: Adds <1 µA leakage at 48 V, preserving signal accuracy while suppressing ±8 kV contact ESD per IEC 61000-4-2. |
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 | Bidirectional variant; symmetric VBR ≈53.3–58.9 V in both polarities; same VC and PPPM. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN FD) where reverse voltage may occur. | Select SMBJ48CA-E3/52 only if bidirectional clamping is mandated by signal polarity behavior. |
| SMAJ48A-E3/52 | Lower PPPM = 400 W; identical VWM, VBR, and VC; SMA (DO-214AC) package with smaller footprint and lower thermal mass. | Suitable for space-constrained consumer electronics with lower surge threat levels (e.g., IEC 61000-4-5 Level 2). | Choose SMAJ48A-E3/52 when board area is critical and 400 W peak power suffices for system-level surge testing. |
Compared with SMBJ48A-E3/52, SMBJ48CA-E3/52 adds bidirectional capability at no clamping penalty but requires layout verification for AC coupling, while SMAJ48A-E3/52 reduces surge margin by 33 % and thermal robustness due to smaller package - both serve distinct design constraints rather than drop-in replacement roles.
Availability
SMBJ48A-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, RoHS-compliant manufacturing, and traceable sourcing.
Supply support for SMBJ48A-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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and infrastructure power systems where robustness and repeatable clamping are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ48A-E3/52 under standard test conditions?
The SMBJ48A-E3/52 has a maximum clamping voltage (VC) of 77.4 V when subjected to a 10/1000 µs waveform peak pulse current of 7.8 A. This value is measured at TA = 25 °C with specified mounting conditions (0.2" × 0.2" copper pads), and represents the upper voltage limit imposed on the protected circuit during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ48A-E3/52 RoHS-compliant and halogen-free?
Yes, SMBJ48A-E3/52 carries the "E3" suffix, indicating it is RoHS-compliant and rated for commercial-grade applications. It is not halogen-free; for halogen-free compliance, the "M3" suffix variant (e.g., SMBJ48A-M3/52) must be selected. Both meet JESD 201 Class 2 whisker resistance and UL 94 V-0 flammability requirements.
Does SMBJ48A-E3/52 have AEC-Q101 qualification?
No, SMBJ48A-E3/52 is not AEC-Q101 qualified. The automotive-grade version uses the "HE3" suffix (e.g., SMBJ48AHE3_B/H), which undergoes additional stress testing for temperature cycling, humidity, and lifetime validation per AEC-Q101. For under-hood or safety-critical automotive use, SMBJ48AHE3_B/H - not SMBJ48A-E3/52 - must be specified.
What is the thermal resistance and power derating behavior of SMBJ48A-E3/52?
SMBJ48A-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W on standard 0.2" × 0.2" copper pads. Its 5.0 W steady-state power dissipation (PD) must be derated linearly above 25 °C ambient, reaching zero at 75 °C ambient - per Figure 2 in the Vishay datasheet 88392. This derating curve is essential for sustained leakage current management in enclosed enclosures.
How is polarity marked on SMBJ48A-E3/52, and what happens if installed backward?
SMBJ48A-E3/52 is unidirectional and marked with a cathode band on one end of the SMB package. Installing it backward (anode to protected line) renders it ineffective for reverse-transient suppression - the device will conduct heavily during normal forward bias, potentially causing short-circuit failure or excessive power dissipation. Correct orientation places the banded end toward the protected line and the unmarked end toward ground.
SMBJ48A-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:
- 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-E3/52 FAQ
1.How can I place an order for SMBJ48A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48A-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 SMBJ48A-E3/52 reliable?
The price and inventory of SMBJ48A-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 SMBJ48A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ48A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48A-E3/52?
SMBJ48A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48A-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 SMBJ48A-E3/52?
For technical support, including SMBJ48A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48A-E3/52 requirements.
6.How does Aetrix verify that SMBJ48A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ48A-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 SMBJ48A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ48A-E3/52?
All SMBJ48A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48A-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 SMBJ48A-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ48A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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