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onsemi SA12ARL
- Part No.:
- SA12ARL
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA12ARL.pdf
- Description:
- TVS DIODE 12VWM 19.9VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,098
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Product details
Overview
SA12ARL from ON Semiconductor is a unidirectional 12 V MiniMOSORB Zener transient voltage suppressor (TVS) in axial lead Surmetic package (Case 59AA), rated for 500 W peak pulse power, 19.9 V clamping voltage at 25.1 A peak pulse current, and <1 µA leakage at VRWM, designed to protect DC power rails and signal lines in industrial power supplies and medical equipment.
For engineers reviewing the SA12ARL datasheet, pinout, applications, or equivalent options, key selection criteria include working peak reverse voltage (12 V), clamping performance under 1 ms surge, UL 497B certification for isolated loop protection, and Pb-free axial-leaded packaging with cathode band polarity marking.
Technical Context
The SA12ARL operates as a unidirectional Zener-based TVS diode, triggered when reverse voltage exceeds its 13.3–14.7 V breakdown range (at 1 mA test current). It clamps transients to ≤19.9 V at 25.1 A, with <1.0 ns response time and low zener impedance to limit energy delivered to downstream circuitry.
Its thermal design relies on junction-to-lead resistance of 33.3°C/W and steady-state power dissipation of 3.0 W at TL ≤ 75°C, derated linearly above that temperature. The device meets ESD Class 3 (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection - a requirement for certified industrial and medical system interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/typ/max) | 13.3 / 14.0 / 14.7 V @ 1 mA - defines precise Zener conduction onset for reliable overvoltage thresholding |
| VC @ IPP | 19.9 V @ 25.1 A - peak clamped voltage during 1 ms transient, limiting stress on protected ICs |
| PPK | 500 W @ 1 ms - surge energy handling capacity compatible with IEC 61000-4-5 Level 4 testing |
| IR @ VRWM | <1 µA - negligible standby leakage, critical for low-power or battery-backed circuits |
| Response Time | <1.0 ns - ensures suppression before sensitive logic or analog circuitry is damaged |
| UL Recognition | UL 497B (QVGV2, File #E116110) - validated for use in safety-critical isolated communication and control loops |
Pinout & Package
SA12ARL uses an axial-leaded Surmetic plastic package (JEDEC DO-41 compatible, Case 59AA), with cathode identified by a colored band. Leads are solderable per J-STD-020, rated for 260°C for 10 seconds at 1/16 inch from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional protection configuration |
| Cathode | Zener breakdown terminal | Connected to protected line; reverse-biased operation enables clamping above VRWM |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse rating | Supports robust immunity to 1 ms surges up to 25.1 A without degradation, meeting IEC 61000-4-5 requirements |
| UL 497B recognition | Validated for use in certified isolated loop protection circuits - eliminates need for additional safety qualification |
| ESD Class 3 compliance | Withstands >16 kV human-body-model discharge, enabling direct integration into exposed front-panel or interface connectors |
| Pb-free axial package (Case 59AA) | Enables RoHS-compliant through-hole assembly with standard wave-solder profiles and long-term supply stability |
| Low temperature coefficient | Stable VBR across -55°C to +175°C operating range, ensuring consistent clamping in automotive or industrial environments |
Applications
| Industrial Power Supply Protection | Medical Equipment Input Stage |
|---|---|
Use Scenario: DC input rail of AC/DC converter subjected to lightning-induced surges on mains-connected equipment. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across primary-side bulk capacitor to clamp differential-mode transients. Use Value: Limits voltage excursion to ≤19.9 V during 500 W surges, preventing MOSFET gate oxide rupture and controller IC latch-up. | Use Scenario: Isolated sensor interface in patient-connected diagnostic device requiring UL 497B compliance. IC Role / Device Role / Timing Role: Secondary-side transient suppressor on isolated 12 V bias rail feeding analog front-end amplifiers. Use Value: UL-recognized clamping ensures regulatory acceptance of isolation barrier integrity under surge stress. |
| Numerical Control I/O Protection | Business Machine Communication Port |
Use Scenario: 24 V digital I/O line in CNC controller exposed to relay coil flyback and motor drive coupling. IC Role / Device Role / Timing Role: Point-of-entry TVS on PLC output module channel, mounted adjacent to connector. Use Value: Sub-1 ns response captures fast-edge transients before they propagate into FPGA or microcontroller GPIO. | Use Scenario: RS-232 or USB VBUS line in multifunction printer subjected to ESD events during cable insertion. IC Role / Device Role / Timing Role: Board-level ESD suppressor on external-facing port, leveraging Class 3 HBM rating. Use Value: Absorbs >16 kV contact discharge without parametric shift, preserving signal integrity and port reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Surface-mount SMA package (vs. axial); same VRWM (12 V), slightly higher VC (20.1 V @ 24.3 A) | Requires PCB rework for SMT layout; better for high-density or automated assembly | Select SMAJ12A when board space is constrained and reflow compatibility is required |
| P6KE12A | DO-15 package; identical VRWM (12 V), but lower PPK (600 W vs. 500 W), higher IR (5 µA) | Legacy through-hole alternative with broader distributor availability but no UL 497B recognition | Select P6KE12A only if UL certification is not mandated and higher leakage is acceptable |
Compared with SMAJ12A and P6KE12A, the SA12ARL uniquely combines UL 497B listing, Pb-free axial leads, and tight VBR tolerance (±5%) - making it preferred for certified industrial and medical designs where safety compliance and through-hole manufacturability are jointly required.
Availability
SA12ARL is available at Aetrix Electronics and suitable for industrial power supplies, medical equipment input stages, numerical control I/O modules, and business machine communication ports requiring stable component supply with full regulatory documentation and traceable sourcing.
Supply support for SA12ARL 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
ON Semiconductor (now part of onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SA12ARL belongs to the SA5.0A Series MiniMOSORB family - engineered specifically for high-reliability transient suppression in safety-critical, UL-regulated systems such as medical devices and industrial controls.
FAQ
What is the clamping voltage of the SA12ARL under peak pulse conditions?
The SA12ARL clamps to a maximum of 19.9 V at its rated peak pulse current of 25.1 A (1 ms waveform). This value is guaranteed per the datasheet's electrical characteristics table and reflects worst-case performance under standardized surge testing, ensuring downstream components see no more than this voltage during transient events.
Does the SA12ARL meet UL 497B requirements for isolated loop protection?
Yes, the SA12ARL is UL 497B recognized (File #E116110, QVGV2 category) for isolated loop circuit protection. This certification covers the entire SA5.0A–SA170A series and validates performance in dielectric withstand, endurance conditioning, and strike voltage breakdown tests - confirming suitability for safety-critical medical and industrial isolation barriers.
What is the package type and lead finish of the SA12ARL?
The SA12ARL uses ON Semiconductor's Surmetic axial-leaded plastic package (Case 59AA, JEDEC DO-41 compatible), with Pb-free leads rated for soldering at 260°C for 10 seconds at 1/16 inch from the case. Polarity is marked by a cathode band, and all external surfaces are corrosion-resistant and readily solderable.
How does the SA12ARL compare to the SA12AG variant?
The SA12ARL and SA12AG share identical electrical specifications (VRWM = 12 V, VBR = 13.3–14.7 V, VC = 19.9 V), but differ in packaging: SA12ARL is supplied in 5000-piece tape-and-reel format, while SA12AG is in 1000-unit boxes. Both are Pb-free and UL-recognized; reel format supports automated placement, whereas boxed units suit manual or low-volume prototyping.
What is the maximum steady-state power dissipation for the SA12ARL?
The SA12ARL has a steady-state power dissipation rating of 3.0 W at lead temperature (TL) ≤ 75°C, derated linearly at 30 mW/°C above that temperature. This rating assumes 3/8-inch lead length and defines safe continuous power handling - distinct from its 500 W peak pulse capability, which applies only to short-duration transients.
SA12ARL 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 25.1A
- 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
SA12ARL FAQ
1.How can I place an order for SA12ARL through Aetrix?
Please submit a Request for Quotation (RFQ) for SA12ARL 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 SA12ARL reliable?
The price and inventory of SA12ARL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA12ARL is usually 5 days.
3.What payment methods are accepted for SA12ARL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA12ARL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA12ARL?
SA12ARL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA12ARL 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 SA12ARL?
For technical support, including SA12ARL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA12ARL requirements.
6.How does Aetrix verify that SA12ARL is sourced from the original manufacturer or authorized distributors?
All SA12ARL 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 SA12ARL meets industry standards.
7.What is the process for return or replacement of SA12ARL?
All SA12ARL units undergo pre-shipment inspection (PSI). If there is an issue with SA12ARL, 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 SA12ARL part is unused and in its original packaging.
Return procedure for SA12ARL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA12ARL Tags
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