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onsemi SA170ARLG
- Part No.:
- SA170ARLG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA170ARLG.pdf
- Description:
- TVS DIODE 170VWM 275VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,998
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Product details
Overview
SA170ARLG from onsemi is a unidirectional MiniMOSORB Zener transient voltage suppressor (TVS) designed for high-energy surge clamping in DC power rails and signal lines. It features a 170 V working peak reverse voltage (VRWM), 275 V maximum clamping voltage at 208 A peak pulse current, 500 W peak pulse power (1 ms), <1.0 ns response time, and UL 497B recognition for isolated loop circuit protection.
For engineers reviewing the SA170ARLG datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system DC operating voltage, clamping voltage margin relative to protected IC absolute maximum ratings, surge current capability under IEC 61000-4-5 waveform, and axial leaded Surmetic package compatibility with through-hole PCB assembly and thermal derating constraints.
Technical Context
The SA170ARLG operates as a voltage-clamped shunt protector: it remains high-impedance below VRWM (170 V), then avalanches sharply at VBR (189–209 V @ 1 mA) to divert transient energy away from downstream circuitry. Its low zener impedance and fast sub-nanosecond response ensure minimal overvoltage exposure during ESD or lightning-induced surges.
Rated for 500 W nonrepetitive peak power (1 ms pulse), it sustains 3.0 W steady-state dissipation at 25°C lead temperature - derated linearly above 50°C - and exhibits only 1.8 mV/°C temperature coefficient of breakdown voltage, enabling stable clamping across industrial temperature ranges (−55°C to +150°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 170 V - minimum continuous reverse voltage before significant leakage; sets upper limit for protected circuit's normal operating voltage. |
| VBR (min/typ/max) | 189 / 199 / 209 V @ 1 mA - precise avalanche onset ensures predictable clamping threshold with tight 5% tolerance. |
| VC @ IPP | 275 V @ 208 A - maximum clamped voltage during 1 ms surge; defines worst-case overvoltage seen by downstream components. |
| PPK | 500 W @ 1 ms - peak transient energy handling capacity per single event; validated per Figure 4 waveform. |
| Response time | <1.0 ns - enables effective suppression of fast-rising ESD transients (IEC 61000-4-2) before sensitive nodes are overstressed. |
| IR @ VRWM | <1 μA - negligible standby leakage avoids power loss or bias shift in high-impedance circuits. |
| UL 497B | Recognized for isolated loop circuit protection - certifies compliance with strike voltage, endurance, dielectric withstand, and discharge testing. |
Pinout & Package
SA170ARLG 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 indicated by a band. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during clamping | Connected to ground or low-impedance return path; carries full surge current during transient events. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., DC input rail); voltage referenced to anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges without degradation when properly heatsinked via leads. |
| UL 497B recognition | Validated for use in safety-critical isolated loop applications including telecom interfaces and medical equipment signal isolation barriers. |
| ESD rating >16 kV HBM | Withstands repeated human-body-model discharges without parameter shift - critical for manufacturing and field-replaceable modules. |
| Pb-free Surmetic package | RoHS-compliant axial lead construction with solderability guaranteed up to 260°C for 10 s at 1/16″ from case. |
| Low temperature coefficient | 1.8 mV/°C VBR drift ensures clamping voltage stability across −55°C to +150°C, supporting automotive under-hood and industrial control environments. |
Applications
| Industrial Power Supply Input Protection | Telecom Line Interface Protection |
|---|---|
|
Use Scenario: 24–48 V DC input stage of programmable logic controllers (PLCs) exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt clamping element placed between input rail and chassis ground to clamp surges exceeding 170 V. Use Value: Limits transient voltage to ≤275 V at 208 A, protecting upstream rectifiers and downstream DC/DC controllers rated to 300 V absolute max. |
Use Scenario: T1/E1 data line interface in base station remote radio units, subject to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Primary surge suppressor on tip/ring pair, coordinated with gas discharge tube (GDT) front-end for multi-stage protection. Use Value: Fast <1 ns response captures initial surge edge; UL 497B recognition validates suitability for telecom safety-isolated circuits. |
| Medical Equipment Signal Isolation | Renewable Energy Inverter DC Link |
|
Use Scenario: Isolated sensor signal conditioning inputs in patient-connected diagnostic devices requiring reinforced insulation per IEC 60601-1. IC Role / Device Role / Timing Role: Secondary-side TVS on isolated analog front-end, referenced to isolated ground to prevent common-mode overvoltage breakdown. Use Value: UL 497B certification confirms compliance for protector-class isolation barrier applications, eliminating need for additional safety validation. |
Use Scenario: DC link bus (300–400 V nominal) in solar string inverters, subjected to grid-switching transients and capacitor bank ringing. IC Role / Device Role / Timing Role: Parallel clamping device across DC link capacitors to absorb high-energy oscillatory surges not handled by bulk capacitance alone. Use Value: 500 W peak power rating enables absorption of >100 mJ transients; low leakage (<1 μA) prevents parasitic discharge of hold-up capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A | Surface-mount SMB package (vs. axial lead); identical 170 V VRWM and 275 V VC, but lower 600 W PPK rating and higher 2.5 μA IR. | Requires SMT reflow process and offers smaller footprint; less suitable for high-current through-hole board areas or manual repair. | Select SMBJ170A only when board space is constrained and thermal coupling to copper pour can support its lower steady-state power (1.0 W vs. SA170ARLG's 3.0 W). |
| P6KE170A | Legacy DO-15 package; same VRWM and VC, but 600 W PPK, higher 5 μA IR, no UL 497B recognition, and slower ~1.5 ns response. | Lacks safety certification for isolated loop use; acceptable for non-safety-critical industrial controls where UL compliance is not mandated. | Choose P6KE170A only for cost-sensitive legacy designs where UL 497B is unnecessary and existing DO-15 footprints must be retained. |
Compared with SMBJ170A and P6KE170A, SA170ARLG delivers superior reliability in safety-certified systems via UL 497B, higher steady-state power handling (3.0 W), lower leakage (<1 μA), and faster response (<1.0 ns), making it optimal for medical, telecom, and industrial applications demanding certified robustness.
Availability
SA170ARLG is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom line interface protection, medical equipment signal isolation, renewable energy inverter DC link, and process control system surge hardening requiring stable component supply and long-term lifecycle support.
Supply support for SA170ARLG 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, high-reliability silicon solutions for automotive, industrial, cloud, and intelligent power systems.
The SA5.0A Series, including SA170ARLG, belongs to onsemi's MiniMOSORB transient voltage suppressor family - engineered specifically for robust, certified clamping in safety-critical and high-surge industrial infrastructure applications.
FAQ
What is the maximum clamping voltage of the SA170ARLG under surge conditions?
The SA170ARLG has a maximum clamping voltage (VC) of 275 V when subjected to its rated peak pulse current of 208 A, measured using the 1 ms exponential waveform defined in Figure 4 of the datasheet. This value represents the highest voltage that will appear across the device during a standardized transient event, directly determining the overvoltage stress imposed on downstream components. Designers must verify that this clamped voltage remains below the absolute maximum ratings of protected ICs or passives.
Does the SA170ARLG meet UL safety standards for circuit protection?
Yes, the SA170ARLG is UL 497B recognized (File #E210057, QVGQ2 classification) for use in isolated loop circuit protection. This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - confirming its suitability for safety-critical applications such as medical equipment interfaces and telecom isolation barriers. The UL recognition applies explicitly to the SA5.0A series, including SA170ARLG.
What is the thermal derating behavior of the SA170ARLG for continuous operation?
The SA170ARLG is rated for 3.0 W steady-state power dissipation at a lead temperature (TL) of 25°C, with linear derating beginning at TL = 50°C at 30 mW/°C - reducing to zero dissipation at TL = 150°C. This derating curve (Figure 5) reflects its thermal resistance of 33.3°C/W from junction to lead. Effective heat sinking via PCB copper and lead length (3/8″ recommended) is essential to maintain safe junction temperatures during sustained leakage or repetitive low-energy transients.
How does the SA170ARLG compare to bidirectional TVS diodes in surge protection design?
The SA170ARLG is unidirectional and optimized for DC-biased lines where reverse polarity is not expected - offering tighter VBR tolerance (±5%), lower leakage (<1 μA), and higher surge capability than equivalent bidirectional parts. Bidirectional variants (e.g., SA170CA) are required only for AC-coupled or polarity-agnostic signals. Using SA170ARLG on a DC rail avoids unnecessary capacitance and leakage penalties inherent in bidirectional designs, improving signal integrity and efficiency.
What packaging and reel configuration is supplied for the SA170ARLG orderable part?
The SA170ARLG is supplied in Pb-free axial-leaded Surmetic packaging (Case 59AA) on tape-and-reel, with 5000 units per reel. The "RLG" suffix explicitly denotes this tape-and-reel format, distinguishing it from the "G" (1000/unit box) and "LFG" (2000/unit box, lead-formed) variants. Reel specifications - including orientation, pocket dimensions, and leader/trailer lengths - comply with ON Semiconductor's BRD8011/D tape-and-reel standard.
SA170ARLG 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):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 1.8A
- 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
SA170ARLG FAQ
1.How can I place an order for SA170ARLG through Aetrix?
Please submit a Request for Quotation (RFQ) for SA170ARLG 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 SA170ARLG reliable?
The price and inventory of SA170ARLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA170ARLG is usually 5 days.
3.What payment methods are accepted for SA170ARLG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA170ARLG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA170ARLG?
SA170ARLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA170ARLG 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 SA170ARLG?
For technical support, including SA170ARLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA170ARLG requirements.
6.How does Aetrix verify that SA170ARLG is sourced from the original manufacturer or authorized distributors?
All SA170ARLG 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 SA170ARLG meets industry standards.
7.What is the process for return or replacement of SA170ARLG?
All SA170ARLG units undergo pre-shipment inspection (PSI). If there is an issue with SA170ARLG, 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 SA170ARLG part is unused and in its original packaging.
Return procedure for SA170ARLG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA170ARLG Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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