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Diodes Incorporated SMAJ48A-13-F
- Part No.:
- SMAJ48A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48A-13-F.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:29,574
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Product details
Overview
SMAJ48A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 48V reverse standoff voltage (VRWM), 53.3V minimum breakdown voltage (VBR), 77.4V maximum clamping voltage (VC) at 5.2A peak pulse current (IPP), and operates across –55°C to +150°C. Used in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMAJ48A-13-F datasheet, SMAJ48A-13-F pinout, SMAJ48A-13-F application, or SMAJ48A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC rails, 8.3ms surge current handling (IFSM = 40A), thermal derating above +25°C, and compatibility with SMA package reflow profiles.
Technical Context
This TVS diode employs glass-passivated silicon junction construction for stable avalanche clamping under transient stress. Its unidirectional configuration provides low forward voltage drop (VF = 3.5V @ 35A) during positive surges while blocking reverse leakage (<5µA @ 48V) in normal operation.
The device responds within picoseconds to transients per IEC 61000-4-2/4-4/4-5 standards, with clamping performance validated using 10/1000µs waveform testing. Thermal design must account for 1.0W steady-state dissipation at TL = +75°C and pulse derating above ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - Sustains single 10/1000µs transients without failure |
| Reverse Standoff Voltage | 48V - Maximum continuous DC voltage before clamping initiates |
| Clamping Voltage | 77.4V @ 5.2A - Limits voltage seen by downstream circuitry during surge |
| Breakdown Voltage | 53.3–58.9V @ 1mA - Ensures reliable turn-on above VRWM with margin |
| Leakage Current | <5µA @ 48V - Negligible standby power loss and signal distortion |
| Operating Temp Range | –55°C to +150°C - Validated for under-hood automotive and industrial environments |
| Package | SMA - Standard surface-mount footprint compatible with automated assembly |
Pinout & Package
Two-terminal SMA package with cathode band marking on unidirectional devices. Terminals are matte tin-plated for RoHS-compliant solderability per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input reference node for unidirectional clamping | Connected to protected line; conducts surge current to cathode during overvoltage |
| Cathode | Clamp return path / ground reference | Connected to system ground or lower-potential rail; establishes clamping threshold |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Ensures stable VBR and low parameter drift over temperature and lifetime |
| 400W peak pulse rating | Withstands IEC 61000-4-5 Level 4 (4kV) surges on 50Ω source impedance |
| Fast response time | Sub-nanosecond turn-on enables protection of high-speed logic and analog circuits |
| RoHS & Halogen-free | Complies with EU RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900ppm Br/Cl) |
| SMA package | Enables high-density PCB layout with industry-standard reflow compatibility |
Applications
| Automotive Power Input Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: 12V battery-fed ECU power rail exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role: Primary clamping element placed between fuse and DC-DC converter input. Use Value: Clamps transients to ≤77.4V, protecting 36V-rated input stages while surviving 40A surge peaks. | Use Scenario: 4–20mA current loop interface in factory automation PLC modules. IC Role / Device Role: Line-side surge suppressor on analog input terminals. Use Value: Limits induced surges to safe levels without adding capacitance that degrades loop bandwidth. |
| Telecom DC Feeder Protection | Motor Drive Control Signal Lines |
Use Scenario: -48V telecom power feeders subject to lightning-induced surges. IC Role / Device Role: Unidirectional TVS on power entry before hot-swap controller. Use Value: Maintains low leakage (<5µA) during normal operation while clamping ±1kV transients. | Use Scenario: PWM enable and fault feedback lines connecting MCU to gate driver ICs. IC Role / Device Role: Point-of-use protection against inductive switching noise. Use Value: Sub-nanosecond response prevents false triggering of safety shutdown circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CA-13-F | Bidirectional version; symmetric clamping for AC-coupled or floating lines | Required where differential surges or bidirectional signal paths exist (e.g., RS-485) | Select only if polarity reversal or AC signal protection is needed; otherwise unidirectional offers lower leakage |
| SMBJ48A-13-F | Same electrical specs but SMB package (higher PPK = 600W, larger footprint) | Preferred when higher surge margin or thermal mass is required in space-tolerant designs | Choose when board layout allows larger package and 600W rating improves system-level test margin |
Compared with SMAJ48CA-13-F and SMBJ48A-13-F, SMAJ48A-13-F delivers optimal balance of compact SMA footprint, 400W surge capability, and minimal leakage for unidirectional DC rail protection-making it ideal for space-constrained automotive and industrial modules where cost and size are critical.
Availability
SMAJ48A-13-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial programmable logic controllers, telecom power distribution units, and motor drive control boards requiring stable component supply and long-term manufacturability.
Supply support for SMAJ48A-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.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for robust, standardized overvoltage protection in automotive, industrial, and communications infrastructure applications.
FAQ
What is the maximum clamping voltage of SMAJ48A-13-F under standard test conditions?
The maximum clamping voltage (VC) is 77.4V at a peak pulse current (IPP) of 5.2A, measured using the 10/1000µs double-exponential waveform per IEC 61000-4-5. This value ensures protected circuits remain below critical overvoltage thresholds during surge events.
Does SMAJ48A-13-F meet automotive qualification requirements?
No-SMAJ48A-13-F is the standard-grade version. For automotive applications, Diodes offers the AEC-Q101-qualified SMAJ48AQ-13-F variant, manufactured in IATF 16949-certified facilities and supported with PPAP documentation.
How does the SMA package affect thermal performance compared to SMB or SMC?
The SMA package has lower thermal resistance than SMB/SMC due to smaller copper pad area and shorter internal thermal path. At TL = +75°C, its steady-state power dissipation is rated at 1.0W-lower than SMBJ's 1.5W-but sufficient for transient-only duty cycles typical in TVS applications.
Can SMAJ48A-13-F be used in bidirectional signal lines like RS-232 or CAN?
No-it is unidirectional and will conduct continuously if reverse-biased beyond VF. For bidirectional data lines, use the SMAJ48CA-13-F variant or select a dedicated bidirectional TVS array with matched channel characteristics.
SMAJ48A-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ48A-13-F FAQ
1.How can I place an order for SMAJ48A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48A-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 SMAJ48A-13-F reliable?
The price and inventory of SMAJ48A-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 SMAJ48A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ48A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48A-13-F?
SMAJ48A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48A-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 SMAJ48A-13-F?
For technical support, including SMAJ48A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48A-13-F requirements.
6.How does Aetrix verify that SMAJ48A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ48A-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 SMAJ48A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ48A-13-F?
All SMAJ48A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48A-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 SMAJ48A-13-F part is unused and in its original packaging.
Return procedure for SMAJ48A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48A-13-F Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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Diodes Incorporated
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