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onsemi SA17ARL
- Part No.:
- SA17ARL
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA17ARL.pdf
- Description:
- TVS DIODE 17VWM 27.6VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,955
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Product details
Overview
SA17ARL 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 17 V working peak reverse voltage (VRWM), 27.6 V maximum clamping voltage at 18.1 A peak pulse current, <1 µA leakage at VRWM, and sub-1 ns response time. It is used in industrial power supplies, medical equipment surge protection, and communication interface circuits.
For engineers reviewing the SA17ARL datasheet, pinout, applications, or equivalent options, key selection criteria include verified clamping performance at 18.1 A IPP, UL 497B recognition for isolated loop protection, axial leaded Surmetic package compatibility with through-hole reflow, and temperature coefficient-controlled breakdown stability.
Technical Context
The SA17ARL operates as a unidirectional Zener-based TVS diode, conducting only during reverse overvoltage events above its 18.9–20.9 V breakdown range (at 1 mA test current). Its low zener impedance and fast <1 ns response enable effective suppression of ESD and lightning-induced surges without affecting normal circuit operation.
It is rated for 500 W nonrepetitive peak power per 1 ms pulse (per Figure 4), with thermal derating to 3.0 W steady-state at 75°C lead temperature. The device meets Class 3 ESD immunity (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection - a qualification covering strike voltage, endurance, and dielectric withstand testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system voltage margin. |
| VBR (min/typ/max) | 18.9 / 19.9 / 20.9 V @ 1 mA - Confirmed Zener breakdown range; ensures predictable turn-on threshold across temperature. |
| VC @ IPP | 27.6 V @ 18.1 A - Clamped voltage during worst-case 1 ms surge; defines maximum stress on downstream ICs. |
| IPP | 18.1 A - Peak pulse current capability at 1 ms; determines survivability against IEC 61000-4-5 Level 4 surges. |
| Leakage @ VRWM | <1 µA - Negligible standby power loss and minimal interference in high-impedance sensing circuits. |
| Response Time | <1 ns - Fast enough to suppress ESD events (IEC 61000-4-2) before damage occurs to CMOS inputs. |
| UL Recognition | UL 497B (QVGV2, File #E116110) - Validated for use in safety-critical isolated loop protection, not just flammability. |
Pinout & Package
SA17ARL is housed in ON Semiconductor's Surmetic axial-leaded plastic package (Case 59AA), featuring corrosion-resistant leads, void-free transfer-molded thermosetting body, and cathode polarity band marking. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential rail in unidirectional clamp configuration. |
| Cathode | Reverse-biased Zener terminal | Connected to protected line; conducts when reverse voltage exceeds VRWM to shunt surge current. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Supports robust protection against 1 ms lightning surges (IEC 61000-4-5) without thermal runaway. |
| UL 497B recognition | Validated for safety-critical isolated loop applications - exceeds basic package flammability requirements. |
| Class 3 ESD rating (>16 kV HBM) | Eliminates need for additional ESD stages in front-end interfaces like RS-485 or CAN bus nodes. |
| Pb-Free Surmetic package | RoHS-compliant axial lead construction with 260°C solderability and mechanical reliability in harsh environments. |
| Temperature-coefficient-specified VBR | Ensures stable clamping threshold across -55°C to +175°C operating range, critical for automotive under-hood use. |
Applications
| Industrial Power Supply Protection | Medical Equipment Surge Suppression |
|---|---|
Use Scenario: Protecting 24 V DC input rails in PLC power modules from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp transients exceeding 17 V. Use Value: Limits voltage seen by downstream DC-DC controllers to ≤27.6 V during 18.1 A surges, preventing latch-up or gate oxide damage. |
Use Scenario: Safeguarding patient-connected analog front-ends in ECG monitors against defibrillator-induced surges. IC Role / Device Role / Timing Role: Primary transient suppressor on isolated sensor input lines compliant with IEC 60601-1 creepage/clearance requirements. Use Value: UL 497B recognition confirms suitability for isolated loop protection, enabling certification-ready design without secondary clamping stages. |
| Communication Interface Protection | Process Control Signal Line Guarding |
Use Scenario: Shielding RS-485 transceiver I/O pins in factory automation gateways from cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance Zener TVS mounted directly at connector to minimize stub length and preserve signal integrity. Use Value: Sub-1 ns response captures ESD before transceiver input structures are stressed, while <1 µA leakage avoids bias current errors. |
Use Scenario: Protecting 4–20 mA current loop receivers in hazardous-area process transmitters from field wiring surges. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to loop supply rail, absorbing energy from induced transients on twisted-pair wiring. Use Value: 500 W peak power rating sustains multiple 1 ms surges per IEC 61000-4-4, ensuring long-term reliability in petrochemical plants. |
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 | Surface-mount SMA package (vs. axial SA17ARL); 27.6 V VC @ 17.5 A; same VRWM and VBR range. | Requires PCB redesign for SMT placement; better for space-constrained boards but less robust for manual repair or high-vibration mounts. | Select SMAJ17A only when board real estate is constrained and automated assembly is available. |
| P6KE17A | Legacy DO-15 package; 27.7 V VC @ 17.3 A; identical electrical specs but no UL 497B recognition or Class 3 ESD rating. | Lacks UL 497B validation for isolated loop use; unsuitable for medical or safety-certified industrial systems. | Choose P6KE17A only for cost-sensitive, non-certified consumer-grade applications where UL compliance is not required. |
Compared with SMAJ17A and P6KE17A, SA17ARL uniquely combines axial-leaded mechanical robustness, UL 497B certification for isolated loops, and Class 3 ESD immunity - making it the preferred choice for certified industrial and medical designs requiring field-replaceable, high-surge-capability protection.
Availability
SA17ARL is available at Aetrix Electronics and suitable for industrial power supplies, medical diagnostic equipment, and industrial communication interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SA17ARL 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 IoT applications.
The SA5.0A Series, including SA17ARL, belongs to onsemi's MiniMOSORB transient voltage suppressor family - engineered specifically for high-reliability, UL-recognized surge protection in safety-critical industrial and medical systems.
FAQ
What is the clamping voltage of SA17ARL at its rated peak pulse current?
The SA17ARL has a maximum clamping voltage (VC) of 27.6 V at 18.1 A peak pulse current (IPP), measured per the 1 ms exponential waveform defined in Figure 4 of the datasheet. This value is guaranteed across manufacturing lots and represents the upper limit of voltage imposed on protected circuitry during a worst-case transient event. Designers use this parameter to verify that downstream components remain within their absolute maximum ratings under surge conditions. The SA17ARL maintains this clamping performance with low zener impedance and stable thermal behavior up to 175°C junction temperature.
Is SA17ARL certified for use in safety-isolated circuits?
Yes, SA17ARL carries UL 497B recognition (File #E116110, category QVGV2) for isolated loop circuit protection - a qualification that covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance. Unlike basic flammability-only certifications, UL 497B validates the SA17ARL's functional safety role in protecting isolated interfaces such as those found in medical equipment and industrial process controllers. This certification applies specifically to the SA5.0A–SA170A series, including SA17ARL.
What is the package type and lead finish of SA17ARL?
SA17ARL uses ON Semiconductor's proprietary Surmetic axial-leaded plastic package (Case 59AA), with Pb-Free (RoHS-compliant) leads that are readily solderable at 260°C for 10 seconds at 1/16 inch from the case. The package features a void-free, transfer-molded thermosetting body, corrosion-resistant external surfaces, and cathode polarity indicated by a band. Its axial form factor supports manual insertion, wave soldering, and high-vibration mechanical mounting - distinguishing it from surface-mount alternatives like SMAJ17A.
How does SA17ARL compare to standard Zener diodes in surge protection?
SA17ARL is engineered specifically as a transient voltage suppressor, not a general-purpose Zener. It delivers 500 W peak pulse power handling (vs. typically <5 W for standard Zeners), sub-1 ns response time, and controlled clamping characteristics optimized for surge events. Standard Zeners lack guaranteed IPP ratings, UL recognition, or ESD classification - making them unsuitable for IEC 61000-4-2/4-5 compliance. The SA17ARL's low zener impedance and tight VBR tolerance (18.9–20.9 V) ensure repeatable, low-jitter clamping essential for protecting modern low-voltage ICs.
What is the maximum operating temperature range for SA17ARL?
SA17ARL is rated for an operating and storage temperature range of -55°C to +175°C, with thermal resistance from junction-to-lead (RJL) specified at 33.3°C/W. Its breakdown voltage exhibits a controlled temperature coefficient, ensuring stable clamping performance across this full range. This wide envelope supports deployment in under-hood automotive modules, industrial motor drives, and outdoor telecom equipment - environments where ambient temperatures exceed 100°C and thermal cycling is severe. Derating curves in Figures 1 and 2 confirm sustained 500 W pulse capability down to -40°C.
SA17ARL 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):
- 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
SA17ARL FAQ
1.How can I place an order for SA17ARL through Aetrix?
Please submit a Request for Quotation (RFQ) for SA17ARL 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 SA17ARL reliable?
The price and inventory of SA17ARL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA17ARL is usually 5 days.
3.What payment methods are accepted for SA17ARL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA17ARL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA17ARL?
SA17ARL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA17ARL 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 SA17ARL?
For technical support, including SA17ARL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA17ARL requirements.
6.How does Aetrix verify that SA17ARL is sourced from the original manufacturer or authorized distributors?
All SA17ARL 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 SA17ARL meets industry standards.
7.What is the process for return or replacement of SA17ARL?
All SA17ARL units undergo pre-shipment inspection (PSI). If there is an issue with SA17ARL, 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 SA17ARL part is unused and in its original packaging.
Return procedure for SA17ARL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA17ARL 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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