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onsemi SA45ARLG
- Part No.:
- SA45ARLG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45ARLG.pdf
- Description:
- TVS DIODE 45VWM 72.7VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,671
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Product details
Overview
SA45ARLG from onsemi is a unidirectional 500 W peak power MiniMOSORB Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power rails and signal lines. It features a 45 V working peak reverse voltage (VRWM), 49.4 V maximum clamping voltage at 10.3 A peak pulse current, <1 µA leakage at VRWM, and sub-1 ns response time. It is used in industrial power supplies and communication interface protection where robust surge immunity is required.
For engineers reviewing the SA45ARLG datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, UL 497B certification for isolated loop protection, axial leaded Surmetic package thermal performance, and ESD Class 3 (>16 kV HBM) compliance.
Technical Context
The SA45ARLG operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transient overvoltages above its 45 V VRWM. Its low zener impedance and fast <1 ns response ensure minimal overshoot during 8.3 ms half-sine surges up to 500 W.
It is rated for 10.3 A peak pulse current (IPP), with clamping voltage specified at 49.4 V - critical for ensuring protected ICs remain below absolute maximum ratings. The device meets UL 497B for isolated loop circuit protection and exhibits ±0.05 %/°C temperature coefficient on VBR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 45 V - maximum continuous reverse operating voltage before clamping begins; sets minimum system rail margin |
| VC @ IPP | 49.4 V @ 10.3 A - clamped voltage during worst-case surge; defines upper bound of protected node stress |
| IPP | 10.3 A - peak pulse current capability per 8.3 ms half-sine waveform; determines surge energy handling (500 W) |
| IR @ VRWM | <1 µA - reverse leakage at rated working voltage; ensures negligible standby power loss in high-impedance circuits |
| Response Time | <1 ns - time from transient onset to clamping activation; prevents nanosecond-scale voltage spikes from reaching downstream ICs |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - certified for isolated loop circuit protection, not just flammability |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - qualifies for direct I/O port protection in harsh ESD environments |
Pinout & Package
SA45ARLG is housed in an axial-leaded Surmetic plastic package (Case 59AA), with cathode identified by a polarity band. Leads are tin-plated, solderable at 260°C for 10 seconds at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; grounded or connected to lower-potential rail in unidirectional configuration | Provides low-VF path (<3.5 V @ 35 A) for fault currents when reverse-transient clamping is not active |
| Cathode | High-impedance terminal under normal bias; clamps to VRWM + dynamic margin during transients | Connected to protected line (e.g., RS-485 bus, DC input); absorbs surge energy via controlled avalanche breakdown |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power rating | Enables protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges without derating in compact axial form factor |
| UL 497B recognition (QVGQ2) | Validates suitability for safety-critical isolated loop applications such as telecom line cards and medical sensor interfaces |
| Pb-free Surmetic axial package | RoHS-compliant construction with void-free thermoset plastic, corrosion-resistant finish, and 260°C solder compatibility |
| Low zener impedance & fast response | Minimizes clamping overshoot and ensures reliable suppression of EFT/burst and lightning-induced transients |
| Temperature-stable VBR | ±0.05 %/°C coefficient enables predictable clamping across −55°C to +150°C operating range |
Applications
| Industrial Power Supply Input Protection | RS-485/422 Communication Line Clamping |
|---|---|
Use Scenario: Protecting 48 V DC input stage of programmable logic controllers against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to shunt surge energy before it reaches upstream rectifiers and bulk capacitors. Use Value: Clamps 500 W surges to ≤49.4 V, preventing overvoltage failure of 63 V-rated electrolytic capacitors and MOSFET gate drivers. |
Use Scenario: Safeguarding differential data lines in factory automation networks exposed to ground potential differences and EFT noise. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices (one per line) referenced to common-mode ground, absorbing common-mode transients while preserving signal integrity. Use Value: Sub-1 ns response and low capacitance (<50 pF) prevent data corruption during 4 kV contact discharge events per IEC 61000-4-2. |
| Medical Equipment Isolated Sensor Interfaces | Point-of-Sale Terminal AC/DC Adapter Inputs |
Use Scenario: Protecting analog front-end inputs of patient monitoring devices connected to isolated transducers via long cables. IC Role / Device Role / Timing Role: UL 497B-certified TVS on secondary-side signal lines to meet stringent isolation barrier requirements for patient-connected equipment. Use Value: Validated dielectric withstand and endurance conditioning ensure no insulation degradation or fire hazard under repeated surge stress. |
Use Scenario: Clamping inrush and lightning-induced surges on offline AC/DC adapter primary-side rectifier outputs. IC Role / Device Role / Timing Role: Mounted across bulk capacitor terminals to limit transient voltage rise during 10/1000 µs surges per IEC 61000-4-5. Use Value: 45 V VRWM aligns with 36–42 V DC output rails, providing ≥10% margin while maintaining low leakage for standby efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A | Same VRWM (45 V) and VC (49.4 V), but SMA surface-mount package (vs. axial); 400 W peak power rating | Requires PCB rework for SMT assembly; unsuitable for through-hole or wire-ended designs | Select SMAJ45A only when board space constraints mandate SMT and 100 W lower surge rating is acceptable |
| P6KE45A | Same VRWM and axial package, but 600 W peak power and higher VC (51.2 V @ 9.8 A); no UL 497B listing | Lacks UL certification for isolated loop use; higher clamping voltage reduces margin for 48 V systems | Choose P6KE45A only for non-certified, cost-sensitive industrial controls where UL compliance is not mandated |
Compared with SMAJ45A and P6KE45A, SA45ARLG uniquely combines UL 497B certification, 500 W surge rating, and Pb-free axial packaging - making it the preferred choice for regulated industrial and medical power interface protection where safety compliance and legacy through-hole assembly coexist.
Availability
SA45ARLG is available at Aetrix Electronics and suitable for industrial power supplies, RS-485 communication systems, medical sensor interfaces, and point-of-sale terminal adapters requiring stable component supply and full regulatory traceability.
Supply support for SA45ARLG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SA5.0A Series, including SA45ARLG, was engineered specifically for high-reliability transient suppression in industrial and communications infrastructure - emphasizing UL certification, surge robustness, and axial-package manufacturability.
FAQ
What is the clamping voltage of SA45ARLG and how is it measured?
The SA45ARLG has a maximum clamping voltage (VC) of 49.4 V at 10.3 A peak pulse current (IPP), measured using a 10/1000 µs double-exponential surge waveform per IEC 61000-4-5. This value represents the highest voltage the device allows across its terminals during a standardized transient event, ensuring protected circuitry remains within safe operating limits. SA45ARLG's low VC directly supports design margin for 48 V systems.
Does SA45ARLG meet UL 497B, and what does that certification cover?
Yes, SA45ARLG is UL 497B recognized (File #E210057, Category QVGQ2) for isolated loop circuit protection - covering dielectric withstand, endurance conditioning, strike voltage breakdown, and discharge testing. Unlike basic flammability-only listings, UL 497B validates SA45ARLG's functional safety role in protecting communication loops where galvanic isolation is critical. This certification applies explicitly to the SA5.0A Series, including SA45ARLG.
What is the thermal resistance and steady-state power rating of SA45ARLG?
SA45ARLG has a junction-to-lead thermal resistance (RJL) of 33.3 °C/W and a steady-state power dissipation (PD) of 3.0 W at TL ≤ 25°C, derated linearly to 30 mW/°C above 50°C. This thermal profile supports reliable operation in enclosed industrial enclosures with limited airflow, provided leads are mounted with ≥3/8″ length for heat sinking. SA45ARLG's axial package enables direct thermal coupling to chassis or heatsink surfaces.
Is SA45ARLG compatible with lead-free soldering processes?
Yes, SA45ARLG is supplied in a Pb-free Surmetic axial package qualified for lead-free reflow and hand-soldering. Its leads tolerate 260°C for 10 seconds at 1/16″ from the case, meeting IPC/JEDEC J-STD-020 moisture sensitivity and JEDEC J-STD-006 solderability standards. The "RLG" suffix explicitly denotes RoHS-compliant, Pb-free construction - confirmed in onsemi's ordering information and packaging specifications.
How does SA45ARLG compare to bidirectional TVS diodes in surge protection?
SA45ARLG is unidirectional and optimized for DC-biased lines like power rails and single-ended signals, offering lower leakage (<1 µA) and tighter clamping than bidirectional equivalents. Bidirectional TVS devices (e.g., SA45A) are suited for AC or floating lines but exhibit higher leakage and reduced VRWM margin. SA45ARLG's polarity-specific design ensures superior performance in 48 V DC systems where reverse conduction must be blocked during normal operation.
SA45ARLG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- MiniMosorb™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
SA45ARLG FAQ
1.How can I place an order for SA45ARLG through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45ARLG 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 SA45ARLG reliable?
The price and inventory of SA45ARLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45ARLG is usually 5 days.
3.What payment methods are accepted for SA45ARLG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45ARLG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45ARLG?
SA45ARLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45ARLG 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 SA45ARLG?
For technical support, including SA45ARLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45ARLG requirements.
6.How does Aetrix verify that SA45ARLG is sourced from the original manufacturer or authorized distributors?
All SA45ARLG 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 SA45ARLG meets industry standards.
7.What is the process for return or replacement of SA45ARLG?
All SA45ARLG units undergo pre-shipment inspection (PSI). If there is an issue with SA45ARLG, 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 SA45ARLG part is unused and in its original packaging.
Return procedure for SA45ARLG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA45ARLG Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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