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onsemi SA11AG
- Part No.:
- SA11AG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA11AG.pdf
- Description:
- TVS DIODE 11VWM 18.2VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,375
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Product details
Overview
SA11AG from ON Semiconductor is a unidirectional MiniMOSORB Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power rails and signal lines. It features a 11 V working peak reverse voltage (VRWM), 500 W peak pulse power rating at 1.0 ms, clamping voltage of 18.2 V at 30.9 A IPP, and sub-1 ns response time. It is used in industrial power supplies and medical equipment input protection.
For engineers reviewing the SA11AG datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC margin relative to protected IC absolute maximum ratings, UL 497B certification for isolated loop compliance, and axial leaded Surmetic package thermal derating above 50°C.
Technical Context
The SA11AG operates as a voltage-clamping device in parallel with sensitive circuitry, conducting only when reverse voltage exceeds its breakdown threshold (VBR = 12.2–12.9 V @ IT = 1 mA). Its low zener impedance and fast <1 ns response enable effective suppression of ESD and lightning-induced surges per IEC 61000-4-2/4-5.
It is rated for 500 W nonrepetitive peak pulse power (tp = 1.0 ms, waveform per Figure 4), with steady-state dissipation limited to 3.0 W at TL ≤ 25°C and derated linearly above 50°C. Thermal resistance from junction-to-lead is 33.3°C/W, supporting reliable operation under sustained surge conditions when mounted with 3/8″ lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC rail or signal peak. |
| VBR @ IT=1 mA | 12.2–12.9 V - Breakdown voltage range defining turn-on threshold; ensures consistent clamping onset across production lot. |
| VC @ IPP=30.9 A | 18.2 V - Clamped voltage during 1.0 ms surge; determines maximum stress on downstream components. |
| IPP | 30.9 A - Peak pulse current supported at rated 500 W; defines minimum surge energy handling capability. |
| IR @ VRWM | 1 μA - Reverse leakage at 11 V; negligible power loss and no measurable loading on low-current circuits. |
| Response Time | <1 ns - Enables suppression of fast-rising transients before protected ICs experience overvoltage damage. |
| UL 497B | Certified - Validated for isolated loop circuit protection including strike voltage, endurance, and dielectric withstand tests. |
Pinout & Package
SA11AG is housed in an axial-leaded Surmetic plastic package (Case 59AA), with cathode indicated by a polarity band. Leads are tin-plated, solderable at 260°C for 10 seconds at 1/16″ from case. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; establishes reference for clamping action. |
| Cathode | High-side transient input terminal | Connected to protected line; conducts surge current to ground when VRWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power (1.0 ms) | Supports robust protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without failure. |
| Clamping voltage 18.2 V @ 30.9 A | Provides safe margin below 20 V absolute maximum ratings of common 12 V logic and analog ICs. |
| UL 497B recognition (QVGQ2) | Validates suitability for certified isolated loop interfaces in industrial and medical systems. |
| ESD rating >16 kV HBM | Meets IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) without external ESD diodes. |
| Pb-free Surmetic axial package | Enables RoHS-compliant through-hole assembly with proven long-term reliability and moisture resistance. |
Applications
| Industrial Power Supply Input Protection | Medical Equipment ESD Shielding |
|---|---|
Use Scenario: 12 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and field wiring transients. IC Role / Device Role: Primary shunt clamping element placed between +12 V rail and chassis ground. Use Value: Limits transient overshoot to ≤18.2 V, preventing latch-up or gate oxide rupture in upstream DC/DC controllers and LDOs. |
Use Scenario: Patient-connected sensor interface board in diagnostic ultrasound equipment requiring IEC 60601-1 compliance. IC Role / Device Role: First-line transient suppressor on analog front-end signal lines before isolation barrier. Use Value: Absorbs >16 kV HBM ESD events and suppresses coupling from adjacent RF sources while maintaining <1 μA leakage. |
| Numerical Control System Bus Lines | Communication Interface Surge Protection |
Use Scenario: 24 V encoder feedback lines in CNC motion control cabinet subject to inductive kickback from servo drives. IC Role / Device Role: Unidirectional TVS on differential A/B quadrature signals referenced to common ground. Use Value: Clamps negative-going transients to within ±0.5 V of ground, preserving edge integrity for high-speed counting up to 1 MHz. |
Use Scenario: RS-485 data lines in building automation gateway exposed to lightning-induced ground potential rise. IC Role / Device Role: Line-to-ground clamping device on both A and B bus conductors. Use Value: Limits common-mode surge voltage to <18.2 V, enabling transceiver survival per IEC 61000-4-5 4 kV test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A | Surface-mount SMA package (vs. axial); same VRWM (11 V), slightly higher VC (18.5 V @ 30.2 A). | Requires PCB rework for SMT assembly; better high-frequency response due to lower parasitic inductance. | Preferred for space-constrained, high-density boards where automated placement is required. |
| P6SMB11A | Same axial package (DO-15), but higher IR (5 μA @ VRWM) and lower surge rating (600 W vs. 500 W). | Marginally higher leakage may affect ultra-low-power sensor nodes; wider availability in legacy designs. | Acceptable where leakage tolerance >1 μA and UL 497B certification is not mandated. |
Compared with SMAJ11A and P6SMB11A, SA11AG offers UL 497B certification, lower leakage (1 μA), and optimized thermal performance in axial through-hole mounting-making it preferred for safety-critical industrial and medical power entry points where regulatory validation and long-term reliability are prioritized over footprint size.
Availability
SA11AG is available at Aetrix Electronics and suitable for industrial power supplies, medical equipment input stages, and numerical control system protection requiring stable component supply and full regulatory traceability.
Supply support for SA11AG 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 onsemi) is a global semiconductor manufacturer specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and cloud power applications.
The SA5.0A Series-including SA11AG-is part of ON Semiconductor's MiniMOSORB TVS family, engineered specifically for high-reliability transient suppression in harsh environments where UL-certified clamping performance and axial-leaded mechanical robustness are essential.
FAQ
What is the breakdown voltage range of SA11AG at 1 mA test current?
The SA11AG has a specified breakdown voltage (VBR) range of 12.2 V to 12.9 V when measured at IT = 1 mA and TA = 25°C. This range ensures predictable clamping onset across manufacturing lots and supports design margining against worst-case overvoltage conditions. The SA11AG's tight VBR distribution contributes to consistent system-level surge immunity performance.
Does SA11AG meet UL 497B requirements for isolated loop protection?
Yes, SA11AG is explicitly included in ON Semiconductor's UL 497B recognition (File #E210057, QVGQ2 category) for isolated loop circuit protection. It passed all required tests including strike voltage breakdown, endurance conditioning, temperature cycling, and dielectric withstand-validating its use in certified medical and industrial isolation barriers where SA11AG serves as primary surge interface protection.
What is the maximum clamping voltage of SA11AG during a 500 W transient event?
The SA11AG clamps to a maximum of 18.2 V when subjected to its rated 500 W peak pulse (1.0 ms, waveform per Figure 4) at IPP = 30.9 A. This VC value is guaranteed across temperature and production lot, enabling designers to verify that protected ICs remain within their absolute maximum voltage ratings during surge events-critical for ensuring functional safety in SA11AG-deployed systems.
Can SA11AG be used in bidirectional signal line protection?
No, SA11AG is a unidirectional TVS diode and is not suitable for bidirectional signal line protection. It conducts only during reverse-biased overvoltage events and blocks forward current beyond its VF (~3.5 V). For AC or differential bus lines like RS-485 or USB, a bidirectional variant (e.g., SA11CA) or back-to-back configuration would be required-not SA11AG.
What is the thermal derating behavior of SA11AG above 50°C ambient?
SA11AG's steady-state power dissipation is derated linearly above TL = 50°C at 30 mW/°C, dropping from 3.0 W at 25°C to zero at approximately 125°C lead temperature. This derating curve (Figure 5) must be applied when calculating safe continuous power handling in enclosed or high-temperature environments where SA11AG is deployed for sustained overvoltage monitoring or low-duty-cycle surge absorption.
SA11AG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- MiniMosorb™
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 27.4A
- 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
SA11AG FAQ
1.How can I place an order for SA11AG through Aetrix?
Please submit a Request for Quotation (RFQ) for SA11AG 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 SA11AG reliable?
The price and inventory of SA11AG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA11AG is usually 5 days.
3.What payment methods are accepted for SA11AG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA11AG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA11AG?
SA11AG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA11AG 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 SA11AG?
For technical support, including SA11AG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA11AG requirements.
6.How does Aetrix verify that SA11AG is sourced from the original manufacturer or authorized distributors?
All SA11AG 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 SA11AG meets industry standards.
7.What is the process for return or replacement of SA11AG?
All SA11AG units undergo pre-shipment inspection (PSI). If there is an issue with SA11AG, 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 SA11AG part is unused and in its original packaging.
Return procedure for SA11AG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA11AG Tags
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