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STMicroelectronics SMBJ48CA-TR
- Part No.:
- SMBJ48CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CA-TR.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:15,318
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Product details
Overview
SMBJ48CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for robust ESD and surge protection of signal/power lines in industrial, automotive, and telecom systems. It delivers 600 W peak pulse power (10/1000 µs), clamps transients to 77.4 V at 8.1 A, and operates up to 150 °C junction temperature with <0.2 µA leakage at 25 °C - deployed in SMPS input rails, RS-485 interfaces, and PoE-powered Ethernet ports.
For engineers reviewing the SMBJ48CA-TR datasheet, SMBJ48CA-TR pinout, SMBJ48CA-TR application, or SMBJ48CA-TR equivalent, key selection criteria include bidirectional clamping voltage (VCL = 77.4 V), low dynamic resistance (RD = 2.28 Ω), IEC 61000-4-2 ±30 kV air/contact discharge compliance, and UL497B recognition for isolated loop circuits.
Technical Context
This TVS diode uses planar silicon junction technology to achieve stable breakdown behavior and low leakage across temperature. Its bidirectional architecture enables symmetrical clamping on AC-coupled or differential lines without polarity constraints, supporting both positive and negative transient suppression in a single device.
The device exhibits fast response time (<1 ns), low clamping ratio (VCL/VBR ≈ 1.45), and thermal stability verified up to 150 °C - critical for high-reliability applications where sustained overvoltage events occur near maximum operating temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 600 W - sustains repetitive surges up to this level without degradation under standard test conditions |
| Clamping Voltage VCL | 77.4 V at 8.1 A - limits downstream voltage stress during 10/1000 µs transients |
| Breakdown Voltage VBR | 53.3–56.1 V at 1 mA - defines precise conduction onset for reliable overvoltage triggering |
| Leakage Current IR | 0.2 µA max at 25 °C - minimizes standby power loss in high-impedance sensing or bias networks |
| Operating Junction Temp. | −55 to +150 °C - supports deployment in under-hood automotive or industrial ambient environments |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact/air discharge - exceeds Level 4 for direct human interaction points |
| UL Recognition | UL497B (File E136224) - certified for use as an isolated loop circuit protector |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, JEDEC-registered outline with matte tin-plated leads (MSL Level 1, J-STD-020 compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Reference terminal for unidirectional devices; symmetric node for bidirectional operation | In SMBJ48CA-TR, both terminals are functionally identical - no polarity dependency for transient suppression |
| Anode | Reference terminal for unidirectional devices; symmetric node for bidirectional operation | Same electrical role as cathode; bidirectional symmetry eliminates orientation sensitivity during PCB placement |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled or differential signal paths (e.g., RS-485, CAN, USB D+/D−) without polarity concerns |
| Low dynamic resistance (RD) | 2.28 Ω - reduces voltage overshoot during fast-rising transients (e.g., lightning-induced surges) |
| High-temperature reliability | Rated for continuous operation at Tj = 150 °C - maintains clamping performance in thermally constrained enclosures |
| UL497B certification | Validated for isolated loop circuit protection per agency file E136224 - simplifies safety compliance in industrial control systems |
| Low leakage current | <0.2 µA at 25 °C - preserves signal integrity in high-impedance sensor front-ends and precision analog circuits |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate driver supply rails against inductive kickback from IGBT/MOSFET switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VDD and GND to clamp voltage spikes before they reach driver ICs. Use Value: Prevents latch-up or permanent damage to gate drivers during motor stall or short-circuit events. |
Use Scenario: Surge suppression on LIN bus lines exposed to load dump or battery reversal transients. IC Role / Device Role / Timing Role: Standoff voltage (48 V) matches 12 V system nominal with margin; clamps to 77.4 V within nanoseconds. Use Value: Maintains LIN communication integrity during ISO 7637-2 Pulse 1/2a/5a events without requiring additional filtering. |
| Telecom Power over Ethernet | Medical Diagnostic Imaging Interfaces |
|
Use Scenario: Input-stage protection on PoE-powered Ethernet switches handling IEEE 802.3af/at/ bt surge requirements. IC Role / Device Role / Timing Role: Bidirectional clamping across data pairs (e.g., MDI-X) and power delivery lines. Use Value: Absorbs 100 A 8/20 µs surges (per IEC 61000-4-5) while maintaining <100 pF capacitance to avoid signal distortion. |
Use Scenario: ESD protection on high-speed analog front-end inputs of ultrasound or MRI signal conditioning boards. IC Role / Device Role / Timing Role: Low-leakage TVS placed directly at connector entry point to shunt ESD before sensitive ADCs or op-amps. Use Value: Prevents false triggers or calibration drift caused by ±30 kV ESD events without loading the 1 MΩ+ input impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA from Vishay (SMCJ48CA) | Same SMB package, 77 V VCL, but higher RD = 2.5 Ω and 1.0 µA leakage at 85 °C | Limited suitability for high-temp industrial designs due to elevated leakage drift | Acceptable for ambient-temperature telecom applications where cost is prioritized over thermal margin |
| P6SMB48CA from ON Semiconductor | Identical VBR (53.3–56.1 V), but lower PPP = 600 W only at 25 °C; derates to 350 W at 125 °C | Not rated for continuous 150 °C operation - unsuitable for under-hood automotive deployments | Preferred for consumer-grade power supplies where thermal derating is less critical |
Compared with SMBJ48CA-TR, the Vishay SMCJ48CA offers comparable clamping but reduced thermal stability, while the ON Semiconductor P6SMB48CA lacks full 150 °C junction rating - making the STMicroelectronics part uniquely suited for high-reliability, high-temperature applications requiring UL497B compliance.
Availability
SMBJ48CA-TR is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom Power over Ethernet systems, and medical diagnostic imaging interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ48CA-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and discrete protection devices for industrial, automotive, and consumer markets.
The SMBJ series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust transient suppression in harsh environments - emphasizing low leakage, high-temperature operation, and regulatory certifications like UL497B and IEC 61000-4-2 Level 4.
FAQ
What is the difference between SMBJ48CA-TR and SMBJ48A-TR?
SMBJ48CA-TR is bidirectional, providing symmetrical clamping for AC or differential signals, while SMBJ48A-TR is unidirectional and requires correct polarity orientation. The CA version has identical VBR (53.3–56.1 V) and VCL (77.4 V), but its dual-junction structure enables protection regardless of voltage polarity - essential for RS-485, CAN, or Ethernet data lines.
Does SMBJ48CA-TR meet IEC 61000-4-5 surge immunity requirements?
SMBJ48CA-TR is rated for 600 W (10/1000 µs) and 4 kW (8/20 µs) peak pulse power, enabling it to handle IEC 61000-4-5 Line-to-Ground surges up to 1 kV (2 Ω source impedance) when used with appropriate series impedance. It is not certified to IEC 61000-4-5 as a standalone system-level solution but serves as a validated component-level suppressor in compliant designs.
Can SMBJ48CA-TR be used in parallel for higher surge current handling?
No - paralleling SMBJ48CA-TR devices is not recommended due to mismatch in VBR tolerance (±5%) and dynamic resistance, which causes uneven current sharing and potential thermal runaway. For higher current capability, select a single higher-rated device such as 5.0SMDJ48CA (5000 W) or implement staged protection with upstream MOVs and downstream TVS.
What is the significance of the "-TR" suffix in SMBJ48CA-TR?
The "-TR" suffix indicates tape-and-reel packaging: 2500 units per 13-inch reel, conforming to EIA-481 standards. This format supports automated SMT assembly, ensures consistent orientation (bidirectional marking allows flexible placement), and includes moisture-sensitive level 1 handling per J-STD-020 - eliminating bake requirements prior to reflow.
SMBJ48CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ, TRANSIL™
- 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):
- 8.1A
- 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:
- SMB
SMBJ48CA-TR FAQ
1.How can I place an order for SMBJ48CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CA-TR 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-TR reliable?
The price and inventory of SMBJ48CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ48CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CA-TR?
SMBJ48CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CA-TR 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-TR?
For technical support, including SMBJ48CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CA-TR requirements.
6.How does Aetrix verify that SMBJ48CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ48CA-TR 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-TR meets industry standards.
7.What is the process for return or replacement of SMBJ48CA-TR?
All SMBJ48CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CA-TR, 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-TR part is unused and in its original packaging.
Return procedure for SMBJ48CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48CA-TR Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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