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Diodes Incorporated SMAJ120CA-13
- Part No.:
- SMAJ120CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120CA-13.pdf
- Description:
- TVS DIODE 120VWM 193VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,671
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Product details
Overview
SMAJ120CA-13 from Diodes Incorporated is a bi-directional 400W surface-mount transient voltage suppressor (TVS) diode designed for clamping ESD and surge transients in power and signal lines. It features a 120V reverse standoff voltage (VRWM), 133–147V breakdown voltage (VBR) at 1mA, 193V max clamping voltage (VC) at 2.0A peak pulse current (IPP), and operates from –55°C to +150°C. Used in DC power input protection for industrial controllers and telecom power supplies.
For engineers reviewing the SMAJ120CA-13 datasheet, SMAJ120CA-13 pinout, SMAJ120CA-13 application, or SMAJ120CA-13 equivalent, key selection criteria include clamping voltage margin relative to system rail, unidirectional vs. bi-directional polarity requirements, thermal derating at elevated ambient temperatures, and compatibility with automated SMT assembly under 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 stable clamping performance across temperature. Its symmetrical I-V characteristic enables protection of AC-coupled or floating signal paths without polarity concerns.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity standards when applied with appropriate series impedance. Clamping behavior is validated using 8.3ms half-sine waveform per JEDEC Method, with peak pulse power rated at 400W at TA = 25°C and derated linearly above that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single transient events up to this energy level without failure under defined test conditions. |
| Reverse Standoff Voltage (VRWM) | 120V - maximum continuous DC or RMS voltage the device blocks before entering avalanche conduction. |
| Breakdown Voltage (VBR) | 133–147V @ 1mA - voltage at which avalanche conduction begins; defines minimum clamping threshold. |
| Max Clamping Voltage (VC) | 193V @ IPP = 2.0A - upper limit of voltage seen by protected circuit during specified surge event. |
| Peak Pulse Current (IPP) | 2.0A - maximum non-repetitive surge current the device can shunt while maintaining VC ≤ 193V. |
| Operating Temperature | –55°C to +150°C - supports deployment in harsh environments including industrial motor drives and outdoor base stations. |
| Package | SMA (DO-214AC) - standard surface-mount outline with 4.80–5.59mm body length and 2.01–2.30mm terminal spacing. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band omitted for bi-directional configuration, weight ≈ 0.064g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional terminals | No polarity distinction; either terminal serves as input/output for transient suppression on AC or floating nodes. |
| Case | Non-electrical mechanical interface | Plastic body provides insulation and mechanical mounting; no thermal or electrical connection to internal die. |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables robust protection against high-energy surges such as lightning-induced transients on 48V telecom lines. |
| Glass-Passivated Die | Improves long-term reliability and stability of VBR and leakage under thermal cycling and humidity stress. |
| Bi-Directional Configuration | Eliminates need for polarity-aware layout; suitable for differential signal lines or AC power inputs. |
| RoHS-Compliant Matte Tin Finish | Supports lead-free reflow soldering per J-STD-020C Level 1, with no moisture sensitivity concerns pre-reflow. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 48V DC input rails against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC/DC converters and microcontroller power domains. Use Value: Limits transient voltage to ≤193V, preventing damage to downstream 200V-rated MOSFETs and PMICs. | Use Scenario: Surge suppression on -48V battery backup feed in central office line cards. IC Role / Device Role / Timing Role: Bi-directional clamping element absorbing both positive and negative polarity surges per IEC 61000-4-5. Use Value: Maintains system uptime by surviving repeated 1kV/2Ω combination wave surges without parameter shift. |
| Automotive Body Control Modules | Industrial Ethernet PHY Interfaces |
Use Scenario: Input protection for LIN bus transceivers powered from switched 12V supply. IC Role / Device Role / Timing Role: Secondary-level TVS placed after fuse and upstream of transceiver ESD diodes. Use Value: Clamps load-dump spikes (ISO 7637-2 Pulse 5a) to safe levels while preserving signal integrity on low-voltage data lines. | Use Scenario: Common-mode surge protection on RJ45 magnetics center taps in PoE-powered devices. IC Role / Device Role / Timing Role: Bi-directional clamp across transformer center taps to suppress longitudinal surges. Use Value: Prevents saturation of Ethernet magnetics and latch-up of PHY ICs during 6kV EFT bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA-13 | Same VRWM and VC, but SMB package (higher thermal mass, 600W PPK rating) | Better suited for higher average surge duty cycles due to improved thermal dissipation | Select when system-level testing shows repeated surges exceed 400W single-pulse limits |
| SMCJ120CA-13 | Same electrical specs, SMC package (1500W PPK, larger footprint) | Required where IEC 61000-4-5 Level 4 compliance mandates >1kA surge handling | Choose when board space permits and regulatory testing requires higher surge margin |
Compared with SMBJ120CA-13 and SMCJ120CA-13, SMAJ120CA-13 offers optimal balance of compact size, cost, and 400W surge capability for space-constrained industrial and telecom designs where single-event protection suffices.
Availability
SMAJ120CA-13 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and industrial Ethernet PHY interfaces requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ120CA-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 voltage suppression portfolio, engineered specifically for high-reliability, surface-mount surge protection in industrial, telecom, and automotive power systems where compactness and repeatable clamping performance are critical.
FAQ
What is the difference between SMAJ120CA-13 and SMAJ120A-13?
The "C" suffix denotes bi-directional configuration, meaning SMAJ120CA-13 has symmetrical clamping for both polarities, while SMAJ120A-13 is unidirectional with a cathode band and only clamps positive transients relative to its marked cathode. Bi-directional operation eliminates polarity-dependent placement errors in AC or floating circuits.
Can SMAJ120CA-13 be used in place of a unidirectional TVS in a DC power rail?
Yes, it can replace a unidirectional TVS on a DC rail, provided the system's maximum operating voltage remains below VRWM (120V) and the clamping voltage (193V) stays within the protected IC's absolute maximum rating. No polarity alignment is needed, simplifying layout-but verify that reverse leakage at VRWM (≤5.0µA) does not affect upstream bias networks.
What is the thermal derating behavior above 25°C ambient?
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. Steady-state power dissipation is limited to 1.0W at TL = 75°C, with derating to zero at ~175°C lead temperature.
Is SMAJ120CA-13 compliant with AEC-Q200 for automotive use?
No-SMAJ120CA-13 is not AEC-Q200 qualified. While it operates from –55°C to +150°C and meets IEC surge standards, Diodes Incorporated does not list it in their AEC-Q200-certified TVS portfolio. For automotive-grade applications, consider the AEC-Q200-qualified D3V3Mxx series or consult Diodes' automotive product selector guide.
SMAJ120CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 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
SMAJ120CA-13 FAQ
1.How can I place an order for SMAJ120CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120CA-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 SMAJ120CA-13 reliable?
The price and inventory of SMAJ120CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ120CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120CA-13?
SMAJ120CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120CA-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 SMAJ120CA-13?
For technical support, including SMAJ120CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120CA-13 requirements.
6.How does Aetrix verify that SMAJ120CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ120CA-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 SMAJ120CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ120CA-13?
All SMAJ120CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120CA-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 SMAJ120CA-13 part is unused and in its original packaging.
Return procedure for SMAJ120CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ120CA-13 Tags
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