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Diodes Incorporated SMAJ120A-13
- Part No.:
- SMAJ120A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120A-13.pdf
- Description:
- TVS DIODE 120VWM 193VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,861
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Product details
Overview
SMAJ120A-13 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 120V reverse standoff voltage (VRWM), 133–147V breakdown voltage (VBR) at 1mA, 193V maximum clamping voltage (VC) at 2.0A peak pulse current (IPP), and operates from –55°C to +150°C junction temperature.
For engineers reviewing the SMAJ120A-13 datasheet, SMAJ120A-13 pinout, SMAJ120A-13 application, or SMAJ120A-13 equivalent, key selection criteria include clamping performance under 8.3ms surge waveforms, unidirectional polarity handling, SMA package thermal derating above 25°C ambient, and compatibility with automated SMT assembly using lead-free reflow profiles.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ps) to transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its unidirectional configuration provides low-leakage reverse blocking (≤5 µA @ 120V) while enabling robust forward conduction during clamping.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity standards when applied with appropriate series impedance. Thermal performance is defined by steady-state power dissipation of 1.0W at TL = 75°C and pulse derating per Fig. 1 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms half-sine surge without failure under JEDEC test conditions |
| Reverse Standoff Voltage | 120V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 133–147V @ 1mA - precise VBR window ensures reliable turn-on margin above VRWM |
| Clamping Voltage | 193V @ 2.0A IPP - limits downstream circuit voltage during worst-case transient |
| Junction Temp Range | –55°C to +150°C - supports operation in automotive engine compartments and industrial controls |
| Package | SMA - standard surface-mount outline with 4.80–5.59mm body length and 2.01–2.30mm terminal width |
Pinout & Package
Two-terminal SMA package: anode and cathode. Cathode identified by band marking. No internal pin numbering; terminals are bidirectional in layout but functionally polarized (cathode = protected line side for unidirectional use).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-impedance return path during clamping |
| Cathode | Protected line terminal | Connected to input/power/signal line requiring overvoltage suppression |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives |
| Lead-free / RoHS compliant | Matte tin finish meets EU Directive Annex exemptions; compatible with Pb-free reflow (J-STD-020C Level 1) |
| Fast response time | <1 ps junction response enables clamping before sensitive ICs experience overstress |
| UL 94V-0 flammability rating | Molded plastic case self-extinguishes, supporting safety-critical end equipment certifications |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V/24V battery-fed control modules exposed to load dump transients up to ±100V. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and microcontroller power rails. Use Value: Limits transient voltage to ≤193V, preventing damage to 3.3V/5V logic supplies and CAN transceivers. | Use Scenario: Analog input channels (0–10V, 4–20mA) connected to field sensors in factory automation cabinets. IC Role / Device Role / Timing Role: First-stage overvoltage guard on signal conditioning PCBs before op-amp front-ends. Use Value: Clamps induced surges from nearby motor drives without adding capacitance that degrades signal bandwidth. |
| Telecom Line Interface | Medical Equipment Power Entry |
Use Scenario: Low-voltage DC power feed (e.g., PoE midspan) entering network edge devices. IC Role / Device Role / Timing Role: Secondary surge protector coordinated with upstream GDT or MOV for staged protection. Use Value: Provides precise 120V standoff and low clamping to protect Ethernet PHYs and PMICs rated for ≤200V absolute max. | Use Scenario: AC/DC adapter output stage feeding isolated DC rails in diagnostic imaging subsystems. IC Role / Device Role / Timing Role: Final-line TVS on secondary-side 24V/48V distribution bus before critical analog front-ends. Use Value: Maintains <5 µA leakage at 120V, avoiding interference with microamp-level sensor bias currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-E3/5A (Vishay) | Same VRWM (120V), slightly higher VC (196V @ 2.0A), identical SMA package | Approved for AEC-Q200 Grade 2; preferred where automotive qualification is mandatory | Select when full automotive qualification documentation and PPAP support are required |
| P6SMB120A (ON Semiconductor) | Same electrical specs (VRWM=120V, VC=193V), but SMB package (larger footprint, higher thermal mass) | Better steady-state power handling (1.5W vs. 1.0W), suited for high-ambient industrial enclosures | Select when board space allows SMB and thermal margin above 75°C is needed |
Compared with SMAJ120A-E3/5A, the SMAJ120A-13 offers identical clamping performance in a cost-optimized, high-volume Diodes Inc. production flow; versus P6SMB120A, it trades thermal headroom for compactness-ideal for space-constrained consumer and telecom designs.
Availability
SMAJ120A-13 is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, telecom line interface, and medical equipment power entry requiring stable component supply across multi-year production cycles.
Supply support for SMAJ120A-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 the Americas.
The SMAJ series belongs to Diodes' transient suppression portfolio, engineered specifically for high-reliability, high-speed clamping in automotive, industrial, and communications infrastructure where JEDEC-compliant surge immunity and RoHS compliance are mandatory.
FAQ
What is the maximum peak pulse current (IPP) rating for SMAJ120A-13?
The SMAJ120A-13 is rated for 2.0A peak pulse current (IPP) at its specified clamping voltage of 193V, measured using a 8.3ms single half-sine waveform per JEDEC standards. This value is derived directly from the VC–IPP relationship in the datasheet's electrical characteristics table and reflects worst-case surge capability under standardized test conditions.
Is SMAJ120A-13 unidirectional or bidirectional?
SMAJ120A-13 is unidirectional, indicated by the absence of the "C" suffix in its part number. It features a cathode band marking and blocks reverse current up to 120V VRWM while clamping positive transients on the cathode side. Bidirectional versions (e.g., SMAJ120CA-13) omit the polarity indicator and clamp both polarities.
Does SMAJ120A-13 meet RoHS requirements?
Yes, SMAJ120A-13 is RoHS compliant per EU Directive 2002/95/EC (RoHS 1) with exemptions for glass and high-temperature solder per Annex Notes 5 and 7. It uses matte tin plating and conforms to J-STD-020C Level 1 moisture sensitivity, making it suitable for lead-free reflow assembly without special baking.
What is the thermal derating behavior above 25°C ambient?
Per Figure 1 in DS19005 Rev. 12, the SMAJ120A-13's peak pulse power derates linearly from 100% at 25°C to ~50% at 100°C ambient. Steady-state power dissipation drops from 1.0W at TL = 75°C to zero at TL = 150°C, as shown in Figure 6. Designers must apply these curves when sizing PCB copper area and airflow for sustained surge duty cycles.
SMAJ120A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 2.1A
- 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)
SMAJ120A-13 FAQ
1.How can I place an order for SMAJ120A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120A-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 SMAJ120A-13 reliable?
The price and inventory of SMAJ120A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ120A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120A-13?
SMAJ120A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120A-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 SMAJ120A-13?
For technical support, including SMAJ120A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120A-13 requirements.
6.How does Aetrix verify that SMAJ120A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ120A-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 SMAJ120A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ120A-13?
All SMAJ120A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120A-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 SMAJ120A-13 part is unused and in its original packaging.
Return procedure for SMAJ120A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ120A-13 Tags
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