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Diodes Incorporated SMAJ28CA-13
- Part No.:
- SMAJ28CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28CA-13.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,096
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Product details
Overview
SMAJ28CA-13 from Diodes Incorporated is a bi-directional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust ESD and surge protection in DC power rails and signal lines. It features a 28V reverse standoff voltage (VRWM), 31.1–34.4V breakdown range (VBR @ 1mA), 45.4V max clamping voltage at 8.8A peak pulse current (IPP), and operates from –55°C to +150°C - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMAJ28CA-13 datasheet, SMAJ28CA-13 pinout, SMAJ28CA-13 application, or SMAJ28CA-13 equivalent, key selection criteria include clamping performance under 8.3ms surge waveforms, bi-directional symmetry for AC-coupled interfaces, RoHS-compliant lead-free packaging (SMA), and compatibility with automated SMT assembly per MIL-STD-202.
Technical Context
This TVS diode uses glass-passivated silicon junction technology to achieve fast response (<1 ps) and stable clamping during transient events. Its bi-directional construction eliminates polarity dependency, enabling use across differential buses like RS-485 or CAN FD physical layers without orientation constraints.
The device complies with IEC 61000-4-2 (ESD ±30kV air/±30kV contact) and IEC 61000-4-5 (surge 4kV line-to-line, 6kV line-to-earth) when properly laid out. Thermal derating follows JEDEC-defined pulse profiles: 400W peak power applies only at TA = 25°C, dropping linearly to ~250W at 100°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms half-sine surge without failure; defines maximum energy absorption capability |
| Reverse Standoff Voltage | 28V - maximum continuous DC or RMS voltage before significant leakage; sets operating rail margin |
| Breakdown Voltage | 31.1–34.4V @ 1mA - guaranteed conduction onset range; ensures predictable turn-on during overvoltage |
| Clamping Voltage | 45.4V @ 8.8A IPP - actual voltage seen by protected circuit during worst-case surge; determines downstream IC survivability |
| Leakage Current | ≤5.0µA @ 28V - minimal standby power loss and signal integrity impact in always-on systems |
| Operating Temperature | –55°C to +150°C - validated for under-hood automotive and industrial motor drive environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount plastic case with UL 94V-0 flammability rating, 0.064g mass, and cathode band omitted (bi-directional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional terminals | No polarity marking; either terminal serves as anode or cathode depending on transient polarity - enables symmetric clamping on AC or floating lines |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Ensures stable VBR and low leakage over temperature and lifetime; resists moisture-induced parameter drift |
| 400W peak pulse rating | Supports high-energy surges per IEC 61000-4-5 Level 4 without degradation - suitable for mains-connected equipment |
| Lead-free / RoHS compliant | Matte tin termination meets EU Directive Annex exemptions; compatible with Pb-free reflow profiles (J-STD-020C Level 1) |
| Fast response time | <1 ps junction response - clamps transients before sensitive logic or analog circuits experience overstress |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24V digital input channels against load dump and inductive switching spikes in programmable logic controllers. IC Role / Device Role / Timing Role: Primary clamping element placed between field wiring and input buffer IC; absorbs >95% of surge energy before reaching ASIC. Use Value: Enables reliable operation at 8.8A peak surge current while holding clamped voltage below 45.4V - preserving 3.3V/5V logic interface integrity. | Use Scenario: Safeguarding LIN bus transceivers and sensor supply lines against battery reverse connection and jump-start transients. IC Role / Device Role / Timing Role: Bi-directional TVS placed directly at connector entry point; clamps both positive and negative polarity surges without external polarity management. Use Value: Eliminates need for dual unidirectional devices; maintains ≤5µA leakage at 28V rail to avoid battery drain in sleep mode. |
| RS-485 Transceiver Interface | DC Power Rail Surge Suppression |
Use Scenario: Protecting full-duplex RS-485 nodes in factory automation networks exposed to ground potential differences and EFT bursts. IC Role / Device Role / Timing Role: Differential pair clamp between A/B lines and ground; symmetric structure prevents common-mode distortion during clamping. Use Value: Clamps transients within 1ps while maintaining <10pF junction capacitance - preserves signal integrity up to 20Mbps. | Use Scenario: Secondary-level surge suppression on 24V/48V DC distribution boards feeding motor drives and HMIs. IC Role / Device Role / Timing Role: Final-stage TVS shunting residual surge energy after upstream MOVs or gas discharge tubes. Use Value: Delivers precise 45.4V clamping threshold - limits downstream voltage overshoot to safe levels for 50V-rated capacitors and MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA-13 | 600W peak power, larger SMB package (4.57×3.94mm), higher thermal mass | Better suited for higher-repetition surge environments; requires more PCB area | Select when system-level testing shows 400W insufficient for worst-case surge repetition rate |
| P6SMB28CA | 600W rating, same SMB footprint, slightly higher clamping (47.1V @ 12.7A) | Higher IPP tolerance but looser clamping spec; may require downstream voltage margin adjustment | Prefer when sourcing legacy P6SMB-series inventory or aligning with existing BOM families |
Compared with SMBJ28CA-13 and P6SMB28CA, SMAJ28CA-13 offers optimal balance of compact size (SMA), precise 45.4V clamping, and sufficient 400W rating for most industrial and automotive single-event surge requirements - minimizing board space without compromising protection fidelity.
Availability
SMAJ28CA-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, RS-485 transceiver interfaces, and DC power rail surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ28CA-13 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 centers across Asia and manufacturing in China, Taiwan, and the US.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability industrial and automotive applications demanding consistent clamping performance, AEC-Q200 readiness, and extended temperature operation.
FAQ
What is the difference between SMAJ28CA-13 and SMAJ28A-13?
SMAJ28CA-13 is bi-directional (suffix 'C'), meaning it clamps voltage transients of either polarity symmetrically - ideal for AC lines or floating interfaces. SMAJ28A-13 is unidirectional, with a cathode band and clamps only positive transients relative to its marked cathode. The 'C' version has no polarity indicator and double the leakage current specification for VRWM ≤10V (not applicable here).
Does SMAJ28CA-13 meet AEC-Q200 requirements?
SMAJ28CA-13 is not officially AEC-Q200 qualified, though its –55°C to +150°C operating range, glass-passivated die, and robust surge ratings align with many automotive subsystem requirements. For AEC-Q200-compliant designs, Diodes recommends the automotive-grade P6SMB28CAQ series, which undergoes full stress testing per the standard.
Can SMAJ28CA-13 be used in parallel for higher surge handling?
Parallel connection is not recommended due to mismatched VBR tolerances (31.1–34.4V), which cause uneven current sharing and potential thermal runaway. For higher power needs, select a single higher-rated device like SMBJ28CA-13 (600W) or use staged protection with upstream MOVs and downstream TVS diodes.
What is the typical junction capacitance of SMAJ28CA-13?
Typical junction capacitance is <10pF at VRWM = 0V and Tj = 25°C, as shown in Figure 2 of the datasheet. This low value ensures minimal signal distortion in high-speed data lines such as RS-485 or CAN, where added capacitance could degrade edge rates or cause reflections.
SMAJ28CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMAJ)
SMAJ28CA-13 FAQ
1.How can I place an order for SMAJ28CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28CA-13 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 SMAJ28CA-13 reliable?
The price and inventory of SMAJ28CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ28CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28CA-13?
SMAJ28CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28CA-13 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 SMAJ28CA-13?
For technical support, including SMAJ28CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28CA-13 requirements.
6.How does Aetrix verify that SMAJ28CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ28CA-13 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 SMAJ28CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ28CA-13?
All SMAJ28CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28CA-13, 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 SMAJ28CA-13 part is unused and in its original packaging.
Return procedure for SMAJ28CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ28CA-13 Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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