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Vishay General Semiconductor - Diodes Division SMBJ48CA-E3/5B
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- Part No.:
- SMBJ48CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CA-E3/5B.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,369
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Product details
Overview
SMBJ48CA-E3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features 48 V standoff 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, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ48CA-E3/5B datasheet, SMBJ48CA-E3/5B pinout, SMBJ48CA-E3/5B application, or SMBJ48CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.35), MSL Level 1 moisture sensitivity, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling transient suppression without polarity constraints on AC-coupled or differential signal paths. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while low incremental surge resistance supports effective energy diversion during ESD or lightning-induced surges.
The device complies with ANSI/IEEE C62.35 for transient suppressor definitions and meets UL 497B recognition (QVGQ2) for protector classification. Thermal resistance is specified as RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), with operating junction temperature range from –55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 53.3 V / 58.9 V at IT = 1 mA - Confirmed bidirectional breakdown range; ensures predictable turn-on under surge conditions. |
| VC @ IPPM | 77.4 V at 7.8 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 600 W - Peak pulse power handling with 0.01% duty cycle; validates robustness against repetitive transients. |
| IPPM | 7.8 A - Peak pulse current corresponding to VC; used to size PCB trace widths and verify layout survivability. |
| TJ max. | +150 °C - Maximum junction temperature; sets thermal derating limits for high-ambient or high-duty-cycle applications. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 0.205" × 0.130" footprint; compatible with JEDEC MS-012AC. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and polarity-unmarked terminals for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical PN junction; conducts during negative-going surges relative to cathode reference. |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical PN junction; conducts during positive-going surges - functionally identical to anode in bidirectional mode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC, differential, or floating signal lines without polarity concerns. |
| 600 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV surge) compliance when properly laid out with 0.2" × 0.2" copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage exposure to downstream ICs compared to higher-ratio suppressors. |
| MSL Level 1 per J-STD-020 | Allows unlimited floor life and standard reflow without baking; simplifies SMT manufacturing flow. |
| RoHS-compliant, matte tin plating | Ensures solderability per J-STD-002 and JESD 22-B102, with whisker resistance per JESD 201 Class 2. |
Applications
| Industrial Motor Drives | Telecom Line Interface |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensing circuits from switching-induced transients in 24–48 V DC motor control systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across MOSFET gate-source or op-amp input pins to limit transient excursions. Use Value: Prevents latch-up or oxide damage in logic-level MOSFETs by limiting gate voltage to ≤77.4 V during 600 W surges. | Use Scenario: Surge suppression on RS-485 or Ethernet PHY signal pairs exposed to induced lightning transients in outdoor base stations. IC Role / Device Role / Timing Role: Symmetrical clamping element across differential lines, referenced to local ground plane. Use Value: Maintains signal integrity by clamping common-mode surges up to ±77.4 V without polarity reversal or DC bias shift. |
| Automotive Body Control Module | Consumer Sensor Hub |
Use Scenario: Input protection for LIN bus transceivers and relay driver outputs subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Secondary-level transient suppressor located after primary LC filtering, directly at IC pins. Use Value: Complements AEC-Q101-qualified variants (e.g., SMBJ48CAHE3_B) for automotive-grade reliability in non-safety-critical modules. | Use Scenario: ESD and EFT protection for I²C/SPI lines connecting MEMS accelerometers, temperature sensors, and microcontrollers in smart home devices. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF at 0 V) shunt device placed adjacent to sensor IC package pins. Use Value: Limits ESD-induced voltage overshoot to <77.4 V while adding negligible signal distortion due to absence of series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No functional difference; selected where halogen-free materials are mandated by end-product environmental policy. | Choose when compliance with IEC 61249-2-21 or JEDEC JS709E is required. |
| SMCJ48CA-E3/2A | Same VWM, VBR, and VC, but in larger SMC (DO-214AB) package with 1500 W PPPM. | Higher power handling enables use in higher-energy surge environments (e.g., AC mains input stages), but requires larger PCB area. | Choose when system-level surge testing exceeds 600 W or when thermal margin must be increased via larger copper pad area. |
Compared with SMBJ48CA-E3/5B, the M3/5B offers identical protection performance with halogen-free construction, while the SMCJ48CA-E3/2A trades compactness for 2.5× higher pulse power - making it suitable for front-end rather than point-of-load protection.
Availability
SMBJ48CA-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, automotive body control modules, and consumer sensor hubs requiring stable component supply and RoHS-compliant TVS protection.
Supply support for SMBJ48CA-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 supplier of discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and transient suppressors with emphasis on reliability, standardization, and automotive qualification.
The SMBJ series is engineered for robust, standardized transient suppression in space-constrained surface-mount applications - targeting cost-sensitive yet reliability-demanding industrial, telecom, and automotive subsystems.
FAQ
What does the "CA" suffix indicate in SMBJ48CA-E3/5B?
The "CA" suffix denotes a bidirectional configuration, meaning SMBJ48CA-E3/5B provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ48A), it has no cathode marking and functions identically in either polarity - essential for protecting AC-coupled or differential signal paths without polarity constraints.
How is SMBJ48CA-E3/5B mounted and what PCB layout guidance applies?
SMBJ48CA-E3/5B uses standard SMB (DO-214AA) surface-mount footprint with matte tin-plated leads. For rated 600 W performance, Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Trace width should exceed 20 mils, and thermal vias under pads improve heat dissipation during repetitive surges - critical to maintain clamping performance within datasheet limits.
Does SMBJ48CA-E3/5B meet automotive qualification standards?
The base SMBJ48CA-E3/5B is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. However, Vishay offers the automotive variant SMBJ48CAHE3_B (with HE3 suffix), which shares identical electrical specs and SMB package but adds AEC-Q101 qualification, extended temperature validation, and enhanced process controls - required for non-safety-critical automotive modules like body control units.
What is the maximum clamping voltage of SMBJ48CA-E3/5B and how is it measured?
The maximum clamping voltage (VC) of SMBJ48CA-E3/5B is 77.4 V, measured at 7.8 A peak pulse current using a 10/1000 µs double-exponential waveform per IEC 61000-4-5. This value represents the highest voltage the device allows across its terminals during a defined surge event - a critical parameter for ensuring protected ICs remain below their absolute maximum ratings.
Can SMBJ48CA-E3/5B replace SMBJ48A in an existing design?
SMBJ48CA-E3/5B cannot directly replace unidirectional SMBJ48A without circuit review: SMBJ48A has a cathode band and only clamps positive transients, while SMBJ48CA-E3/5B clamps both polarities and lacks polarity marking. Substitution is valid only if the application requires bidirectional protection and the PCB layout accommodates the absence of polarity orientation - otherwise, reverse-bias leakage or unintended conduction may occur.
SMBJ48CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ48CA-E3/5B FAQ
1.How can I place an order for SMBJ48CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CA-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 SMBJ48CA-E3/5B reliable?
The price and inventory of SMBJ48CA-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 SMBJ48CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ48CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CA-E3/5B?
SMBJ48CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CA-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 SMBJ48CA-E3/5B?
For technical support, including SMBJ48CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ48CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ48CA-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 SMBJ48CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ48CA-E3/5B?
All SMBJ48CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CA-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 SMBJ48CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ48CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48CA-E3/5B Tags
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