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onsemi SA17ARLG
- Part No.:
- SA17ARLG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA17ARLG.pdf
- Description:
- TVS DIODE 17VWM 27.6VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:14,869
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Product details
Overview
SA17ARLG from onsemi is a unidirectional 500 W peak power MiniMOSORB Zener transient voltage suppressor (TVS) designed to protect voltage-sensitive circuits from high-energy transients. It features a 17 V working peak reverse voltage (VRWM), 27.6 V clamping voltage at 18.1 A peak pulse current, and sub-1 ns response time. It is used in industrial power supplies, medical equipment, and communication systems where robust overvoltage protection is required.
For engineers reviewing the SA17ARLG datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system DC operating voltage, clamping voltage margin relative to IC absolute maximum ratings, surge current capability under 1 ms pulses, and UL 497B recognition for isolated loop circuit protection.
Technical Context
The SA17ARLG operates as a unidirectional Zener-based TVS diode, conducting only during reverse overvoltage events above its breakdown threshold. Its low zener impedance and fast <1.0 ns response ensure minimal voltage overshoot during ESD or lightning-induced surges.
It is rated for 500 W nonrepetitive peak pulse power per 1.0 ms waveform (Figure 4), with thermal derating above 25°C ambient and junction-to-lead thermal resistance of 33.3°C/W. The device meets Class 3 ESD immunity (>16 kV HBM) and UL 497B certification for isolated loop protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; must be ≥ circuit's DC or peak AC rail voltage. |
| VBR @ IT = 1 mA | 18.9–20.9 V - Breakdown occurs within this range; defines turn-on threshold under low-current test conditions. |
| VC @ IPP = 18.1 A | 27.6 V - Maximum clamped voltage seen by protected circuit during full-rated 500 W transient event. |
| IPP | 18.1 A - Peak pulse current supported at 1 ms pulse width; determines minimum series impedance needed for coordination. |
| Leakage @ VRWM | <1 µA - Negligible standby power loss and signal interference in high-impedance sensing or bias networks. |
| Response Time | <1.0 ns - Ensures clamping activation prior to damage onset in fast-rising transients (e.g., ESD, relay bounce). |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Validated for use in isolated loop telecom and industrial interface protection. |
Pinout & Package
SA17ARLG 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 | Reference node for reverse-biased operation | Connected to system ground or lower-potential rail; forms return path during clamping conduction. |
| Cathode | Transient voltage sensing and clamping node | Connected to protected line (e.g., DC input, signal trace); conducts when voltage exceeds VRWM + margin. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power rating | Supports high-energy surge suppression (e.g., IEC 61000-4-5 Level 4) without failure in compact axial form factor. |
| UL 497B recognition | Validates suitability for safety-critical isolated loop protection in telecom, process control, and medical interfaces. |
| ESD rating >16 kV (HBM) | Provides intrinsic board-level ESD immunity without additional discrete protection in front-end stages. |
| Low zener impedance & fast response | Minimizes voltage overshoot during nanosecond-scale transients, preserving integrity of downstream logic and analog ICs. |
| Pb-free Surmetic axial package | Enables RoHS-compliant manufacturing with corrosion-resistant, readily solderable leads and void-free molding. |
Applications
| Industrial Power Supply Protection | Medical Equipment Input Protection |
|---|---|
Use Scenario: DC input stage of AC/DC power supply exposed to load dump or inductive switching transients. IC Role / Device Role: Primary overvoltage clamp placed across bulk capacitor or rectifier output. Use Value: Limits transient voltage to ≤27.6 V, preventing damage to downstream PWM controllers and MOSFETs rated for 30 V max. |
Use Scenario: Patient-connected signal lines (e.g., ECG lead inputs) requiring isolation barrier protection. IC Role / Device Role: Secondary-side TVS on isolated analog front-end, certified per UL 497B for loop integrity. Use Value: Maintains galvanic isolation integrity while suppressing ±15 kV ESD and 0.5 J surges without compromising creepage/clearance. |
| Communication Interface Protection | Numerical Control System I/O Protection |
Use Scenario: RS-485 bus lines in factory automation networks subject to cable discharge and ground potential differences. IC Role / Device Role: Unidirectional clamp on differential pair, referenced to local ground. Use Value: Clamps common-mode surges up to 500 W without distorting data signals due to low capacitance (<100 pF at 0 V). |
Use Scenario: Digital I/O lines of CNC machine controllers interfacing with solenoids and limit switches. IC Role / Device Role: Point-of-use protection on 24 V DC control inputs susceptible to inductive kickback. Use Value: Absorbs 70 A forward surge (IFSM) and 18.1 A reverse pulse, eliminating need for external snubbers or varistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A | Same VRWM (17 V), but lower peak power (400 W), SMC package (surface-mount), higher clamping voltage (27.7 V @ 17.1 A). | Preferred for space-constrained PCB layouts; less suitable for high-reliability through-hole industrial assemblies. | Select SMAJ17A only if board area is critical and surge duty cycle is light; verify thermal pad design for sustained dissipation. |
| 1.5KE18A | Higher VRWM (18 V), same 500 W rating, DO-201 package, slightly higher clamping (29.1 V @ 17.1 A), no UL 497B listing. | Used in legacy power supply designs; lacks UL certification for isolated loop or medical applications. | Choose 1.5KE18A only for cost-sensitive, non-certified industrial controls where UL compliance is not mandated. |
Compared with SMAJ17A and 1.5KE18A, the SA17ARLG uniquely combines UL 497B certification, axial-leaded reliability for high-vibration environments, and precise 17 V VRWM alignment-making it the preferred choice for medical, telecom, and safety-critical industrial systems requiring documented loop protection compliance.
Availability
SA17ARLG is available at Aetrix Electronics and suitable for industrial power supplies, medical equipment interfaces, and communication system surge protection requiring stable component supply and long-term lifecycle support.
Supply support for SA17ARLG 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SA5.0A Series-including SA17ARLG-is part of onsemi's MiniMOSORB TVS portfolio, engineered specifically for high-reliability transient suppression in safety-critical infrastructure, medical devices, and industrial control systems requiring UL-listed protection.
FAQ
What is the clamping voltage of SA17ARLG and how is it measured?
The SA17ARLG has a maximum clamping voltage (VC) of 27.6 V, measured at a peak pulse current (IPP) of 18.1 A using a 1.0 ms exponential waveform per Figure 4 in the datasheet. This value represents the highest voltage the protected circuit will experience during a full-rated 500 W transient event, ensuring downstream components remain within safe operating limits.
Is SA17ARLG certified for use in medical equipment?
Yes, SA17ARLG carries UL 497B recognition (File #E210057, QVGQ2 classification) specifically for isolated loop circuit protection-a requirement in many medical device standards including IEC 60601-1. Its certification covers endurance, dielectric withstand, and discharge testing, making it suitable for patient-connected and safety-isolated subsystems.
Does SA17ARLG have a bidirectional variant?
No, SA17ARLG is strictly unidirectional. The SA5.0A Series includes bidirectional variants designated with a "CA" suffix (e.g., SAC17A), which provide symmetrical clamping for AC-coupled or floating signal lines. SA17ARLG must be oriented with cathode toward the protected line and anode to reference ground.
What is the thermal resistance of SA17ARLG and how does it affect layout?
The SA17ARLG has a junction-to-lead thermal resistance (RJL) of 33.3°C/W. In practice, this means each watt dissipated raises the junction temperature 33.3°C above lead temperature-so adequate lead length (≥3/8″) and copper pour area are essential for reliable operation during repetitive surges or elevated ambient temperatures.
Can SA17ARLG replace SA15AG in an existing design?
SA17ARLG is not a direct replacement for SA15AG due to its higher VRWM (17 V vs. 15 V) and different clamping behavior (27.6 V vs. 24.4 V). Substitution requires verifying that the 17 V VRWM still provides sufficient margin above the protected circuit's operating voltage and that the higher clamping voltage remains within downstream IC tolerances.
SA17ARLG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- MiniMosorb™
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 18.1A
- 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
SA17ARLG FAQ
1.How can I place an order for SA17ARLG through Aetrix?
Please submit a Request for Quotation (RFQ) for SA17ARLG 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 SA17ARLG reliable?
The price and inventory of SA17ARLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA17ARLG is usually 5 days.
3.What payment methods are accepted for SA17ARLG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA17ARLG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA17ARLG?
SA17ARLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA17ARLG 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 SA17ARLG?
For technical support, including SA17ARLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA17ARLG requirements.
6.How does Aetrix verify that SA17ARLG is sourced from the original manufacturer or authorized distributors?
All SA17ARLG 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 SA17ARLG meets industry standards.
7.What is the process for return or replacement of SA17ARLG?
All SA17ARLG units undergo pre-shipment inspection (PSI). If there is an issue with SA17ARLG, 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 SA17ARLG part is unused and in its original packaging.
Return procedure for SA17ARLG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA17ARLG Tags
-
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
-
D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
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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