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Diodes Incorporated SMAJ120A-13-F
- Part No.:
- SMAJ120A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120A-13-F.pdf
- Description:
- TVS DIODE 120V 193V SMA
- Quantity:
- Payment:
- Shipping:
Inventory:970
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Product details
Overview
SMAJ120A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with 120V reverse standoff voltage, 133–147V breakdown range at 1mA, 193V max clamping voltage at 2.0A peak pulse current, and SMA package. It protects DC power rails and signal lines in industrial power supplies and automotive ECUs against ESD and lightning-induced surges.
For engineers reviewing the SMAJ120A-13-F datasheet, SMAJ120A-13-F pinout, SMAJ120A-13-F application, or SMAJ120A-13-F equivalent, key selection criteria include clamping voltage margin relative to system operating voltage, 400W non-repetitive surge capability, unidirectional polarity for DC-biased circuits, and IATF 16949-manufactured supply chain traceability.
Technical Context
This TVS diode operates as a fast-acting shunt clamp triggered by overvoltage events exceeding its 120V standoff threshold. Its glass-passivated junction enables sub-nanosecond response time and stable clamping performance under 8.3ms half-sine surge waveforms.
Designed for single-polarity DC protection, it conducts only during reverse overvoltage transients - forward conduction is limited to 3.5V at 35A surge, making it unsuitable for bidirectional AC line protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms surge events without failure under defined thermal conditions |
| Reverse Standoff Voltage (VRWM) | 120V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 133–147V @ 1mA - guaranteed conduction onset window for reliable overvoltage triggering |
| Max Clamping Voltage (VC) | 193V @ 2.0A - upper limit of voltage seen by protected circuit during rated surge |
| Peak Pulse Current (IPP) | 2.0A - maximum transient current the device safely diverts at VC = 193V |
| Junction Temperature Range | −55°C to +150°C - supports operation in under-hood automotive and industrial ambient environments |
| Package | SMA - standardized surface-mount outline (4.0–4.6mm length, 2.29–2.92mm width) with cathode band marking |
Pinout & Package
Package: SMA (Surface Mount Axial), molded plastic case per UL 94V-0, 0.064g mass, cathode band indicating unidirectional polarity. Moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; defines conduction path during reverse overvoltage |
| Cathode | High-side surge input terminal | Connected to protected line; carries full transient current when clamping above VRWM |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power rating | Enables robust protection against IEC 61000-4-5 Level 3 (1kV/2Ω) surges on 24–48V systems |
| Glass-passivated die construction | Ensures long-term parameter stability and reduced leakage drift over temperature and lifetime |
| Lead-free, RoHS 3 & "Green" compliant | Meets automotive and industrial environmental compliance requirements (<900ppm Br/Cl, <1000ppm Sb) |
| Fast response time | Sub-nanosecond turn-on limits voltage overshoot during ESD (IEC 61000-4-2) events |
| AEC-Q200 stress-tested variant available | Automotive-qualified version (SMAJ120AQ-13-F) supports PPAP and change-controlled manufacturing |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24V DC input stage of DIN-rail mounted programmable logic controller (PLC) power supply exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary shunt TVS at input filter stage, clamping surges before they reach upstream rectifier and bulk capacitor. Use Value: 193V clamping ensures MOSFETs and controllers downstream remain within 20% of absolute maximum ratings during 100A/50ms load dump events. |
Use Scenario: LIN bus transceiver power rail in door module subjected to battery disconnect transients and ESD from user interface buttons. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND adjacent to transceiver IC's supply pin. Use Value: Sub-ns response prevents >150V spikes from corrupting LIN frame timing or damaging transceiver ESD structures. |
| Telecom Remote Radio Unit (RRU) | Renewable Energy Inverter DC Link |
Use Scenario: 48V auxiliary power input of outdoor 5G RRU enclosure subject to induced lightning surges via metallic cable trays. IC Role / Device Role / Timing Role: First-line transient suppression before DC-DC converter input, coordinated with upstream gas discharge tube (GDT). Use Value: 400W rating allows coordination with GDT to handle multi-kA surges while limiting let-through voltage to <200V. |
Use Scenario: DC link between PV array and MPPT stage in string inverter, where voltage can reach 120V under open-circuit conditions. IC Role / Device Role / Timing Role: Overvoltage clamp on high-side DC link monitoring circuit, protecting ADC front-end and isolation amplifier. Use Value: 120V VRWM aligns precisely with system max operating voltage, minimizing false triggering while ensuring clamping before damage threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120AHE3_A/H | Vishay part with identical VRWM (120V), same SMA package, but 194V clamping (vs. 193V) and 2.0A IPP; RoHS-compliant matte tin plating. | No functional difference in 24–48V DC protection; Vishay variant qualified to AEC-Q200 Grade 2 (−40°C to +105°C) vs. Diodes' Grade 1 (−40°C to +125°C). | Select for dual-sourcing in automotive Tier 2 BOMs requiring alternate qualification scope. |
| P6SMB120A | ON Semiconductor part with 120V VRWM, 133–147V VBR, but 200V clamping at 2.0A and 600W peak power rating; same SMA footprint. | Higher clamping voltage reduces protection margin in tight-tolerance 120V systems; 600W rating suits longer-duration surges but increases cost and board area. | Choose only if system requires higher energy handling beyond 400W, accepting 7V higher clamping penalty. |
Compared with SMAJ120A-13-F, SMAJ120AHE3_A/H offers identical electrical protection with alternate automotive qualification, while P6SMB120A trades tighter clamping for higher surge energy capacity - critical when selecting based on IEC 61000-4-5 waveform duration and system voltage margin.
Availability
SMAJ120A-13-F is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom remote radio units requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ120A-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 the Americas.
This SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability DC power rail protection in automotive, industrial, and communications infrastructure where robustness against ISO 7637-2 and IEC 61000-4-5 threats is mandatory.
FAQ
What is the maximum clamping voltage of SMAJ120A-13-F at its rated peak pulse current?
The maximum clamping voltage is 193V at 2.0A peak pulse current (IPP), measured under the standard 8.3ms half-sine waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range (−55°C to +150°C) and represents the highest voltage the protected circuit will experience during a surge event.
Is SMAJ120A-13-F suitable for bidirectional AC line protection?
No. SMAJ120A-13-F is a unidirectional TVS diode with cathode-band polarity marking and is designed exclusively for DC or single-polarity circuits. Bidirectional protection requires the 'C' suffix variant (e.g., SMAJ120CA-13-F), which lacks polarity marking and clamps symmetrically in both directions.
Does this part meet automotive qualification standards?
The standard SMAJ120A-13-F is not AEC-Q200 qualified. However, Diodes offers an automotive-compliant version - SMAJ120AQ-13-F - manufactured in IATF 16949-certified facilities, PPAP-capable, and qualified to AEC-Q200 Grade 1 (−40°C to +125°C). That variant is documented separately in DS19005Q.
How does the SMA package affect thermal performance in high-power surge scenarios?
The SMA package has a junction-to-ambient thermal resistance (RθJA) of approximately 150°C/W. At 400W peak power, even brief surges cause rapid localized heating; effective PCB copper pour (≥1 cm² per pad) and thermal vias are required to maintain junction temperature below 150°C and prevent parametric shift or bond wire failure.
SMAJ120A-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ120A-13-F FAQ
1.How can I place an order for SMAJ120A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120A-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 SMAJ120A-13-F reliable?
The price and inventory of SMAJ120A-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 SMAJ120A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ120A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120A-13-F?
SMAJ120A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120A-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 SMAJ120A-13-F?
For technical support, including SMAJ120A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120A-13-F requirements.
6.How does Aetrix verify that SMAJ120A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ120A-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 SMAJ120A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ120A-13-F?
All SMAJ120A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120A-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 SMAJ120A-13-F part is unused and in its original packaging.
Return procedure for SMAJ120A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ120A-13-F Tags
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Diodes Incorporated
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