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Vishay General Semiconductor - Diodes Division SMBJ48CA-M3/5B
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- Part No.:
- SMBJ48CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CA-M3/5B.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ48CA-M3/5B 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 power and signal lines. It features 48 V stand-off 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, sensor interfaces, and industrial I/O circuits against ESD and inductive switching surges.
For engineers reviewing the SMBJ48CA-M3/5B datasheet, SMBJ48CA-M3/5B pinout, SMBJ48CA-M3/5B application, or SMBJ48CA-M3/5B equivalent, this device is evaluated for bidirectional surge protection in 24–48 V DC systems, including telecom power rails, PLC analog input protection, and automotive body control modules where halogen-free, RoHS-compliant packaging and AEC-Q101 qualification readiness are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior regardless of transient polarity. Its glass-passivated junction ensures stable VBR tolerance (±5%), low incremental surge resistance, and fast response time (<1 ns) to sub-microsecond transients.
The device is rated for 150 °C maximum junction temperature, 100 °C/W junction-to-ambient thermal resistance, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It supports repetitive surge duty cycles up to 0.01 % and is qualified to AEC-Q101 when ordered with HE3/HM3 suffixes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias window for 48 V nominal systems. |
| VBR (min/max) | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown range ensures reliable triggering above system overvoltage thresholds without premature conduction. |
| VC @ IPPM | 77.4 V at 7.8 A - Clamping voltage under 600 W 10/1000 µs surge; limits downstream voltage stress to ≤77.4 V during worst-case transient. |
| PPPM | 600 W - Peak pulse power handling capability with standard 10/1000 µs waveform; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges. |
| IPPM | 7.8 A - Peak pulse current corresponding to 600 W clamping; enables precise PCB trace and fuse sizing for surge path design. |
| TJ max | +150 °C - Maximum junction temperature rating supports operation in high-ambient industrial enclosures and under repeated surge conditions. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical two-terminal construction with cathode/anode terminals interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity - enables placement flexibility on differential or floating lines. |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; forms symmetrical clamping path across protected node and reference (e.g., ground or rail). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, sensor bridges) without polarity constraints. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 1 kV open-circuit / 0.5 kA short-circuit without degradation. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU Directive 2015/863 for restricted substances in industrial and automotive supply chains. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile use (peak 260 °C) without baking - reduces manufacturing overhead and risk of popcorning. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage margin between operating voltage and clamping level - critical for protecting 48 V-rated ICs with tight absolute maximum ratings. |
Applications
| Industrial PLC Analog Inputs | Telecom 48 V DC Power Rails |
|---|---|
|
Use Scenario: Protecting 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers from field-wiring induced surges and ground-bounce transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals and chassis ground to clamp common-mode and differential transients before they reach precision ADC front-end or op-amp buffers. Use Value: Limits transient voltage to ≤77.4 V, preventing latch-up or damage to 36 V-rated input amplifiers and ensuring <1 µs response preserves signal integrity during surge events. |
Use Scenario: Safeguarding primary 48 V DC distribution bus in telecom base stations and remote radio units against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across bus and return, acting as crowbar element to divert >7.8 A surge currents away from DC-DC converters and load switches. Use Value: Maintains bus voltage below 77.4 V during 600 W surges, preserving hold-up time and avoiding undervoltage lockout in downstream 48 V-to-12 V converters. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
|
Use Scenario: Protecting LIN bus transceivers and relay driver outputs in BCMs exposed to load-dump and jump-start transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Bidirectional suppression on LIN data line and switched 12/24 V outputs to absorb reverse-polarity and double-battery transients without polarity-sensitive layout. Use Value: Withstands 7.8 A pulses while holding clamped voltage ≤77.4 V - within safe operating area of LIN PHY ICs rated to 80 V absolute max. |
Use Scenario: Shielding bridge-based pressure/temperature sensors and their instrumentation amplifier interfaces from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance (≈200 pF at 0 V) bidirectional TVS placed directly at connector entry point to shunt transients before reaching sensitive µV-level signal paths. Use Value: Clamps 48 V line to ≤77.4 V in <1 ns, preventing amplifier saturation and maintaining measurement accuracy during 8 kV contact ESD per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA-E3/5B | Same electrical specs and SMB package; RoHS-compliant but not halogen-free (uses brominated flame retardant). | Approved for commercial-grade industrial equipment where halogen content is unrestricted; not accepted in automotive or green-certified infrastructure. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 qualification is unnecessary. |
| SMAJ48CA-13-F | Lower 400 W PPPM, SMA package (smaller footprint, higher RθJA = 140 °C/W), same VWM/VC ratings. | Suitable for space-constrained consumer electronics with lower surge exposure; derates faster above 25 °C ambient. | Choose only if board area is critical and surge threat level is limited to IEC 61000-4-2 ESD (±8 kV) without IEC 61000-4-5 surge requirements. |
Compared with SMBJ48CA-M3/5B, SMBJ48CA-E3/5B offers identical protection performance with non-halogen-free materials, while SMAJ48CA-13-F trades 33 % lower surge power and higher thermal resistance for 30 % smaller PCB area - making SMBJ48CA-M3/5B the optimal choice for robust 48 V industrial and telecom surge immunity where halogen-free compliance is mandated.
Availability
SMBJ48CA-M3/5B is available at Aetrix Electronics and suitable for industrial PLC analog inputs, telecom 48 V DC power rails, and automotive body control modules requiring stable component supply, halogen-free compliance, and long-term lifecycle support.
Supply support for SMBJ48CA-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, power efficiency, and AEC-Q101 qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where consistent clamping performance and long-term stability under surge stress are mandatory.
FAQ
What is the clamping voltage of SMBJ48CA-M3/5B at its rated peak pulse current?
The SMBJ48CA-M3/5B has a maximum clamping voltage (VC) of 77.4 V at its rated peak pulse current (IPPM) of 7.8 A, measured using the standard 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ48CA-M3/5B maintains this clamping performance due to its low incremental surge resistance and glass-passivated junction structure.
Is SMBJ48CA-M3/5B suitable for automotive applications?
SMBJ48CA-M3/5B itself is not AEC-Q101 qualified, but it shares identical electrical and mechanical specifications with the AEC-Q101-qualified variant SMBJ48CA-HM3_B/I (halogen-free, automotive grade). Engineers may use SMBJ48CA-M3/5B in non-safety-critical automotive body electronics where qualification is not mandated, or migrate seamlessly to HM3-suffixed versions for full compliance. The SMBJ48CA-M3/5B's 150 °C TJ max and MSL Level 1 rating support under-hood thermal and assembly requirements.
How does the bidirectional nature of SMBJ48CA-M3/5B affect its PCB layout?
The SMBJ48CA-M3/5B has no polarity marking and functions identically in either orientation, simplifying PCB layout for differential or floating nodes such as RS-485 buses, bridge sensor outputs, or isolated power supplies. Unlike unidirectional TVS diodes, it eliminates the need for orientation verification during placement and allows direct replacement in existing bidirectional protection footprints. This symmetry also avoids errors in high-volume SMT assembly where polarity misalignment could cause field failures.
What is the thermal resistance of SMBJ48CA-M3/5B, and how does it impact power dissipation?
The SMBJ48CA-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. At 25 °C ambient, this limits continuous power dissipation to 5.0 W. During transient events, its low thermal mass enables brief 600 W handling, but sustained surge repetition requires derating per Figure 2 in the datasheet. Proper pad sizing and optional thermal vias are essential to maintain SMBJ48CA-M3/5B junction temperature below 150 °C under repeated stress.
Does SMBJ48CA-M3/5B meet any safety or flammability standards?
Yes, the SMBJ48CA-M3/5B uses molding compound compliant with UL 94 V-0 flammability rating, and carries Underwriters Laboratories recognition (QVGQ2) under UL 497B for protector classification, with file number E136766. These certifications validate its use in safety-critical surge protection circuits across industrial, telecom, and building automation systems. The "M3" suffix further confirms halogen-free composition per IEC 61249-2-21, supporting environmental compliance in regulated markets.
SMBJ48CA-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:
- -
- 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-M3/5B FAQ
1.How can I place an order for SMBJ48CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CA-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 SMBJ48CA-M3/5B reliable?
The price and inventory of SMBJ48CA-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 SMBJ48CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ48CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CA-M3/5B?
SMBJ48CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CA-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 SMBJ48CA-M3/5B?
For technical support, including SMBJ48CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ48CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ48CA-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 SMBJ48CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ48CA-M3/5B?
All SMBJ48CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CA-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 SMBJ48CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ48CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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