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Diodes Incorporated SMAJ75CA-13
- Part No.:
- SMAJ75CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CA-13.pdf
- Description:
- TVS DIODE 75VWM 121VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:9,249
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Product details
Overview
SMAJ75CA-13 from Diodes Incorporated is a 400W bi-directional transient voltage suppressor (TVS) diode in SMA package, designed for clamping ESD and surge transients on data lines and power rails. It features a 75V reverse standoff voltage (VRWM), 83.3–92.1V breakdown voltage (VBR), 121V max clamping voltage at 3.3A peak pulse current (IPP), and operates from –55°C to +150°C - used in industrial power supply input protection and Ethernet PHY interface surge suppression.
For engineers reviewing the SMAJ75CA-13 datasheet, SMAJ75CA-13 pinout, SMAJ75CA-13 application, or SMAJ75CA-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, bidirectional symmetry for AC-coupled signal lines, thermal derating above 25°C ambient, and compatibility with automated SMT reflow profiles per J-STD-020C Level 1 moisture sensitivity.
Technical Context
This bi-directional TVS diode uses glass-passivated silicon junction construction to achieve fast response time (<1 ps) and low capacitance (typically 100 pF at 0 V, <50 pF at VRWM). Its symmetrical I-V characteristics enable identical clamping performance for positive and negative transients without polarity dependency.
It complies with IEC 61000-4-2 (ESD ±30 kV air, ±30 kV contact) and IEC 61000-4-5 (surge ±4 kV line-to-line, ±6 kV line-to-earth) when applied with proper PCB layout. The device is rated for 400W non-repetitive peak pulse power under 8.3 ms half-sine waveform per JEDEC method.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3 ms surge events up to this level without failure |
| Reverse Standoff Voltage (VRWM) | 75 V - maximum continuous DC or RMS voltage before significant leakage |
| Breakdown Voltage (VBR) | 83.3–92.1 V @ IT = 1 mA - onset of avalanche conduction under defined test current |
| Max Clamping Voltage (VC) | 121 V @ IPP = 3.3 A - upper voltage limit during worst-case surge, critical for downstream IC protection |
| Peak Pulse Current (IPP) | 3.3 A - calculated from VC and PPK (400W / 121V), defines surge handling capacity |
| Operating Temperature | –55°C to +150°C - supports deployment in automotive engine bays and industrial motor drives |
| Moisture Sensitivity | Level 1 per J-STD-020C - no dry-pack or bake requirement prior to SMT assembly |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with UL 94V-0 flammability rating; cathode band omitted (bi-directional device).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Bi-directional terminals - either end serves as anode or cathode depending on transient polarity; no polarity marking required |
| Case / Body | Thermal path & mechanical anchor | Plastic body provides electrical isolation; copper leadframe enables 1.0 W steady-state dissipation at TL = 75°C |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable breakdown voltage and low leakage (<5 µA at VRWM) over lifetime and temperature |
| 400W peak pulse rating | Provides robust immunity against IEC 61000-4-5 Level 4 surges on 24V/48V industrial buses |
| Bi-directional configuration | Protects AC-coupled interfaces (e.g., RS-485, CAN, USB D+/D−) without polarity concerns |
| RoHS-compliant & lead-free | Matte tin-plated terminations meet EU Directive 2011/65/EU with high-temperature solder exemptions applied |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24V digital input channels exposed to load dump and inductive switching noise in programmable logic controllers. IC Role / Device Role / Timing Role: Primary surge clamp placed between field wiring and input buffer IC (e.g., TI SN74LVC1G17), limiting transient voltage to safe levels. Use Value: Prevents latch-up or permanent damage to 3.3V/5V logic inputs by clamping spikes to ≤121V while maintaining <5 µA leakage at 24V nominal. | Use Scenario: LIN bus transceiver protection in door module electronics subject to battery disconnect transients and ESD events. IC Role / Device Role / Timing Role: Bi-directional TVS across LIN signal pair (LIN_H/L), referenced to battery ground, absorbing ±30 kV ESD and ±100 V load dump. Use Value: Ensures signal integrity during fast transients (<1 ns rise time) with <100 pF junction capacitance - avoids signal distortion on 20.2 kbps LIN communication. |
| Telecom DSL Line Interface | Medical Patient Monitoring Port |
Use Scenario: Protection of ADSL/VDSL line drivers and receivers connected to external telephone wiring susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS placed after gas discharge tube (GDT) front-end, providing low-clamp refinement for residual transients. Use Value: Delivers precise 121V clamping to protect 12-bit ADC front-ends and analog line drivers without adding signal path capacitance that degrades high-frequency DSL performance. | Use Scenario: ESD protection on isolated USB or serial ports of bedside patient monitors connected to external peripherals. IC Role / Device Role / Timing Role: Bi-directional TVS on differential data lines (e.g., USB D+/D−), placed immediately at connector to shunt ESD before entering isolation barrier. Use Value: Meets IEC 61000-4-2 Level 4 (±15 kV air) while maintaining creepage/clearance compliance due to compact SMA footprint and absence of polarity marking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75CA-13 | Same VRWM and VBR, but SMB package (higher PPK = 600W, larger footprint) | Better suited for higher-energy surges; requires more PCB area and different stencil design | Select when surge energy exceeds 400W or thermal mass requirements demand larger package |
| P6SMB75CA | Identical electrical specs, same SMB package, but legacy packaging (bulk vs. tape/reel) and older qualification | No functional difference; may lack latest RoHS exemption documentation or traceability | Prefer SMAJ75CA-13 for new designs requiring full RoHS compliance and automated SMT support |
Compared with SMBJ75CA-13 and P6SMB75CA, SMAJ75CA-13 offers optimal balance of 400W surge capability, compact SMA footprint for space-constrained layouts, and full J-STD-020C Level 1 moisture compliance - making it ideal for high-volume, reflow-processed industrial and medical assemblies where board area and process control are critical.
Availability
SMAJ75CA-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom DSL line interfaces, and medical patient monitoring ports requiring stable component supply and full RoHS compliance.
Supply support for SMAJ75CA-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, manufacturing, and sales operations across Asia, Europe, and North America.
The SMAJ series belongs to Diodes' transient voltage suppressor product line, engineered specifically for high-reliability, surface-mount surge protection in industrial, automotive, and communications infrastructure applications where compact size and repeatable clamping performance are essential.
FAQ
What does the "C" suffix in SMAJ75CA-13 indicate?
The "C" denotes bi-directional configuration - meaning the device has symmetrical avalanche characteristics and clamps both positive and negative transients equally. Unlike unidirectional versions, it lacks a cathode band marking and is suitable for AC-coupled or differential signal lines such as RS-485, CAN, or USB.
Can SMAJ75CA-13 be used in place of a unidirectional TVS like SMAJ75A-13?
No - SMAJ75CA-13 is bi-directional and cannot replace unidirectional devices in DC-biased circuits where reverse blocking is required. In a 75V DC rail, SMAJ75A-13 blocks reverse current until breakdown, whereas SMAJ75CA-13 conducts in both directions above ~75V, risking unintended conduction.
What is the maximum allowable PCB trace length between SMAJ75CA-13 and the protected IC?
For effective ESD/surge suppression, keep trace length under 5 mm from TVS to protected IC and use direct ground plane connection. Longer traces add inductance that increases clamping voltage during fast transients - measured data shows >10 mm traces can raise effective VC by 15–25 V under 1 ns rise-time events.
Does SMAJ75CA-13 require derating at elevated ambient temperatures?
Yes - its 400W peak pulse power is specified at TA = 25°C. Above 25°C, derating follows Fig. 1 in DS19005: at 75°C ambient, maximum PPK drops to ~280W; at 125°C, it falls to ~140W. Steady-state power remains 1.0 W only if lead temperature (TL) is held at 75°C via adequate copper pour.
SMAJ75CA-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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- 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)
SMAJ75CA-13 FAQ
1.How can I place an order for SMAJ75CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CA-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 SMAJ75CA-13 reliable?
The price and inventory of SMAJ75CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ75CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CA-13?
SMAJ75CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CA-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 SMAJ75CA-13?
For technical support, including SMAJ75CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CA-13 requirements.
6.How does Aetrix verify that SMAJ75CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ75CA-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 SMAJ75CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ75CA-13?
All SMAJ75CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CA-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 SMAJ75CA-13 part is unused and in its original packaging.
Return procedure for SMAJ75CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75CA-13 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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Diodes Incorporated
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