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Diodes Incorporated SMBJ28CA-13-F
- Part No.:
- SMBJ28CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CA-13-F.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:31,356
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Product details
Overview
SMBJ28CA-13-F from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in SMB package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 28 V reverse standoff voltage (VRWM), 31.1–35.8 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 13.2 A peak pulse current, and 600 W peak pulse power dissipation per 10/1000 µs waveform.
For engineers reviewing the SMBJ28CA-13-F datasheet, SMBJ28CA-13-F pinout, SMBJ28CA-13-F application, or SMBJ28CA-13-F equivalent, key selection criteria include clamping performance under IEC 61000-4-2/4-5 surge events, bidirectional polarity tolerance for AC-coupled or floating interfaces, and thermal derating behavior above +25°C ambient.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transients exceeding its breakdown threshold. Its glass-passivated junction ensures stable leakage (<5 µA at VRWM) and repeatable clamping across temperature (–55°C to +150°C operating range).
The device uses an avalanche breakdown mechanism to divert surge energy away from sensitive downstream circuitry. Its 600 W peak pulse rating applies to non-repetitive 10/1000 µs waveforms, with linear derating of 4.8 W/°C above +25°C ambient and 100 A peak forward surge capability for 8.3 ms half-sine pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W - Sustains single 10/1000 µs surges up to this level without failure |
| Reverse Standoff Voltage (VRWM) | 28.0 V - Maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 31.1–35.8 V @ 1 mA - Confirmed avalanche onset range; defines minimum clamping trigger point |
| Max Clamping Voltage (VC) | 45.4 V @ 13.2 A - Upper voltage limit seen by protected circuit during rated surge event |
| Peak Pulse Current (IPP) | 13.2 A - Maximum transient current the device safely clamps at VC |
| Leakage Current (IR) | ≤5.0 µA @ 28 V - Ensures minimal loading on 24 V nominal supply rails during normal operation |
| Operating Temperature | –55°C to +150°C - Validated performance across industrial and automotive under-hood environments |
Pinout & Package
Package: SMB (Surface Mount Body), molded plastic case with UL 94V-0 flammability rating, 0.1 g mass, matte tin-plated terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional terminal pair | No polarity marking; symmetric conduction enables protection of AC signals or floating buses without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| 600 W Peak Pulse Power | Enables compliance with IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) surge testing |
| Glass Passivated Die | Improves long-term reliability and moisture resistance vs. epoxy-passivated alternatives |
| Bi-Directional Construction | Protects differential pairs (e.g., RS-485, CAN FD), AC power inputs, and ungrounded sensor interfaces |
| RoHS & Halogen-Free | Meets IPC-1752A material declaration requirements and EU Directive 2011/65/EU (RoHS 2) |
| Moisture Sensitivity Level 1 | Eliminates bake-out requirement prior to reflow; supports standard SMT assembly flow |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 24 V digital input channels against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt-type transient clamp placed between input terminal and ground, activated only during overvoltage events. Use Value: Limits voltage excursion to ≤45.4 V during 13.2 A surges, preventing damage to optocoupler input stages and microcontroller GPIOs. |
Use Scenario: Safeguarding LIN bus transceivers and sensor supply lines exposed to battery voltage fluctuations. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across VBAT-supplied subsystem rails. Use Value: Withstands repeated 100 V/50 ms load dump pulses while maintaining <5 µA leakage at 28 V nominal rail. |
| RS-485 Transceiver Interface | Smart Meter Communication Port |
|
Use Scenario: Guarding differential A/B lines of isolated RS-485 transceivers against ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to signal ground, enabling ±15 kV IEC 61000-4-2 ESD immunity. Use Value: Symmetric 31.1–35.8 V breakdown ensures balanced clamping on both data lines, preserving signal integrity during fast transients. |
Use Scenario: Securing optical port and PLC communication interfaces in utility-grade electricity meters. IC Role / Device Role / Timing Role: Primary overvoltage barrier on low-voltage auxiliary supply (e.g., 3.3 V or 5 V derived from mains) Use Value: 600 W rating supports EN 61000-4-5 surge immunity up to 2 kV line-to-earth, meeting IEC 62053-21 Class 0.2 accuracy retention requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A-13-F | Uni-directional; cathode-marked; 3.5 V forward voltage at 35 A | Requires correct polarity placement; unsuitable for AC or floating nodes | Select only when protecting unidirectional DC rails with known ground reference |
| SMAJ28CA | Lower 400 W peak power; SMA package (smaller footprint, lower thermal mass) | Limited to lower-energy transients; less effective in high-impedance surge paths | Choose for space-constrained designs where 400 W clamping suffices and thermal margin is adequate |
Compared with SMBJ28A-13-F, the bi-directional SMBJ28CA-13-F eliminates polarity dependency but trades no forward voltage specification; versus SMAJ28CA, it delivers 50% higher surge energy handling in a slightly larger SMB package with superior thermal dissipation.
Availability
SMBJ28CA-13-F is available at Aetrix Electronics and suitable for industrial automation I/O modules, automotive body electronics, RS-485 communication interfaces, and smart metering systems requiring stable component supply and long-term obsolescence management.
Supply support for SMBJ28CA-13-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
This SMBJ series targets board-level surge protection in industrial, automotive, and communications equipment, emphasizing high-power clamping, AEC-Q200 readiness, and green material compliance.
FAQ
What is the maximum clamping voltage of SMBJ28CA-13-F at its rated peak pulse current?
The maximum clamping voltage (VC) is 45.4 V at 13.2 A peak pulse current (IPP), measured under standardized 10/1000 µs waveform conditions. This value represents the highest voltage the protected circuit will experience during a full-rated surge event, ensuring downstream components remain within safe operating limits.
Is SMBJ28CA-13-F suitable for protecting RS-485 differential pairs?
Yes - its bi-directional construction allows symmetrical clamping on both A and B lines without polarity concerns. When placed line-to-ground on each conductor, it maintains common-mode surge suppression while preserving differential signal integrity, supporting ≥±15 kV IEC 61000-4-2 ESD immunity in compliant layouts.
How does temperature affect the clamping performance of SMBJ28CA-13-F?
Clamping voltage increases slightly with junction temperature, but the device remains functional from –55°C to +150°C. Peak pulse power derates linearly at 4.8 W/°C above +25°C ambient, meaning at +75°C ambient, maximum sustainable pulse power drops to 360 W - a critical consideration for high-temperature enclosure designs.
Does SMBJ28CA-13-F require special PCB layout considerations?
Yes - minimize trace inductance between the TVS and protected node using short, wide copper pours. The recommended pad layout (per Diodes Inc. package outline SMB) specifies 2.50 mm pad width and 6.80 mm overall length. Ground plane connection must be low-inductance to ensure rapid surge current return and avoid voltage overshoot during fast transients.
SMBJ28CA-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 13.2A
- 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
SMBJ28CA-13-F FAQ
1.How can I place an order for SMBJ28CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CA-13-F 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 SMBJ28CA-13-F reliable?
The price and inventory of SMBJ28CA-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28CA-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ28CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CA-13-F?
SMBJ28CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CA-13-F 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 SMBJ28CA-13-F?
For technical support, including SMBJ28CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CA-13-F requirements.
6.How does Aetrix verify that SMBJ28CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ28CA-13-F 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 SMBJ28CA-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ28CA-13-F?
All SMBJ28CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CA-13-F, 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 SMBJ28CA-13-F part is unused and in its original packaging.
Return procedure for SMBJ28CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CA-13-F Tags
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Diodes Incorporated
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