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Diodes Incorporated SMAJ48CA-13
- Part No.:
- SMAJ48CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CA-13.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,180
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Product details
Overview
SMAJ48CA-13 from Diodes Incorporated is a bi-directional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 48V reverse standoff voltage (VRWM), 53.3–58.9V breakdown range (VBR @ 1mA), 77.4V max clamping voltage at 5.2A 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 SMAJ48CA-13 datasheet, SMAJ48CA-13 pinout, SMAJ48CA-13 application, or SMAJ48CA-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VCC rating, unidirectional/bi-directional polarity match for AC-coupled or bidirectional data lines, steady-state leakage at VRWM, thermal derating above 75°C, and RoHS-compliant lead-free plating compatibility with reflow profiles.
Technical Context
This bi-directional TVS uses glass-passivated silicon junctions to achieve fast response (<1 ps) to ESD and lightning-induced transients while maintaining low capacitance (typically 120 pF at 0 V). Its symmetrical I-V characteristic enables protection of AC signals, differential buses, and floating power domains without polarity constraints.
The device complies with IEC 61000-4-2 (±15 kV air, ±8 kV contact) and IEC 61000-4-5 (4 kV line-to-line, 6 kV line-to-ground) surge immunity standards. Clamping performance is specified under 8.3 ms half-sine waveform per JEDEC JESD22-A114, with peak pulse power derated linearly above 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3 ms surges up to 5.2 A without failure under defined test conditions |
| Reverse Standoff Voltage (VRWM) | 48 V - maximum continuous DC or RMS voltage before significant leakage begins; sets upper limit for protected circuit operating voltage |
| Breakdown Voltage (VBR) | 53.3–58.9 V @ 1 mA - onset of avalanche conduction; defines minimum clamping threshold under transient stress |
| Max Clamping Voltage (VC) | 77.4 V @ IPP = 5.2 A - worst-case voltage seen by downstream circuit during full-rated surge; determines required IC overvoltage margin |
| Leakage Current (IR) | 5.0 µA @ VRWM - negligible standby power loss and minimal impact on high-impedance sensing nodes |
| Junction Operating Temp | –55°C to +150°C - supports deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band omitted (bi-directional configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional avalanche terminals | No polarity dependency; either terminal serves as input/output for transient energy absorption in both directions |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| 400W peak pulse power rating | Provides headroom for IEC 61000-4-5 Level 3/4 surges without thermal runaway in properly laid-out PCBs |
| RoHS-compliant matte tin plating | Supports lead-free reflow soldering (JEDEC J-STD-020C Level 1) without whisker risk or intermetallic degradation |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage overshoot during fast transients, reducing stress on downstream MOSFETs and controllers |
Applications
| Industrial Power Input Protection | Automotive CAN Bus Protection |
|---|---|
Use Scenario: 24V DC input stage of PLC I/O module exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element placed directly across input rail and chassis ground to shunt >100 V transients within nanoseconds. Use Value: Limits rail voltage to ≤77.4 V during 400W surges, preventing damage to upstream DC-DC controller and downstream logic. |
Use Scenario: Bidirectional protection of CAN_H/CAN_L differential pair in automotive body control unit. IC Role / Device Role / Timing Role: Paired SMAJ48CA-13 devices (one per line) clamp common-mode surges while preserving signal integrity below 120 pF. Use Value: Maintains CAN FD bit timing integrity by limiting transient-induced skew and avoiding bus lockup during ESD events. |
| Telecom PoE Interface | Renewable Energy Charge Controller |
Use Scenario: Secondary-side protection on 48V PoE++ (IEEE 802.3bt) powered device interface. IC Role / Device Role / Timing Role: Fast-clamping TVS placed after isolation transformer to absorb induced surges from cable coupling and hot-plug transients. Use Value: Prevents latch-up in PD interface ICs by clamping to 77.4 V before internal 50 V absolute maximum ratings are exceeded. |
Use Scenario: Battery-side overvoltage suppression in 48V solar charge controller subjected to lightning-induced grid surges. IC Role / Device Role / Timing Role: Bi-directional clamping between battery positive/negative and system ground to handle reverse-polarity and surge events. Use Value: Survives repeated 5.2 A surges without parameter shift, ensuring multi-year field reliability in outdoor installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA-13 | Same electrical specs but SMB package (larger footprint, 600W PPK rating) | Better thermal dissipation in high-ambient environments; requires 2.5× PCB area | Select when board space allows and higher surge margin is needed beyond 400W |
| SMCJ48CA-13 | Same VRWM/VBR/VC but SMC package (1500W PPK, higher Ipp = 15.4 A) | Used where IEC 61000-4-5 Level 4 (6 kV) immunity is mandatory | Choose for mission-critical industrial controls requiring certified 6 kV surge withstand |
Compared with SMBJ48CA-13 and SMCJ48CA-13, SMAJ48CA-13 offers optimal balance of surge capability, compact size, and cost for mid-tier industrial and automotive applications where 400W clamping suffices and PCB real estate is constrained.
Availability
SMAJ48CA-13 is available at Aetrix Electronics and suitable for industrial power input protection, automotive CAN bus protection, telecom PoE interfaces, and renewable energy charge controllers requiring stable component supply across extended product lifecycles.
Supply support for SMAJ48CA-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the US, serving industrial, automotive, and consumer markets.
The SMAJ series targets cost-sensitive, space-constrained applications needing reliable 400W transient suppression in standard surface-mount packages - optimized for automated assembly and high-volume manufacturing.
FAQ
Is SMAJ48CA-13 unidirectional or bi-directional?
SMAJ48CA-13 is bi-directional, indicated by the "C" suffix in the part number per Diodes Incorporated's ordering convention. It has symmetrical avalanche characteristics on both terminals and no cathode band marking, enabling protection of AC signals and floating circuits without polarity concerns.
What is the maximum clamping voltage at rated peak pulse current?
The maximum clamping voltage (VC) is 77.4 V at 5.2 A peak pulse current (IPP), measured under 8.3 ms half-sine waveform per JEDEC JESD22-A114. This value is guaranteed across temperature and represents worst-case voltage imposed on protected circuitry during full-rated surge events.
Does SMAJ48CA-13 meet RoHS requirements?
Yes - SMAJ48CA-13 features matte tin lead finish and complies with RoHS Directive 2011/65/EU, including exemptions for high-melting-point solder and glass in semiconductor devices per Annex III. Full compliance documentation is available in Diodes Incorporated's AP02007 packaging specification.
How does thermal derating affect its surge capability above 25°C?
Per Figure 1 in DS19005 Rev. 12, peak pulse power derates linearly from 100% at 25°C to ~50% at 125°C ambient. At 75°C, it retains ~80% of 400W rating (320W), meaning clamping current reduces proportionally - e.g., IPP drops from 5.2 A to ~4.2 A at that temperature.
SMAJ48CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- 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)
SMAJ48CA-13 FAQ
1.How can I place an order for SMAJ48CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CA-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 SMAJ48CA-13 reliable?
The price and inventory of SMAJ48CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ48CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CA-13?
SMAJ48CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CA-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 SMAJ48CA-13?
For technical support, including SMAJ48CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CA-13 requirements.
6.How does Aetrix verify that SMAJ48CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ48CA-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 SMAJ48CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ48CA-13?
All SMAJ48CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CA-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 SMAJ48CA-13 part is unused and in its original packaging.
Return procedure for SMAJ48CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48CA-13 Tags
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