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onsemi SA11A
- Part No.:
- SA11A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA11A.pdf
- Description:
- TVS DIODE 11VWM 18.2VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,773
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Product details
Overview
SA11A 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 30.3 A peak pulse current, <1 µA leakage at VRWM, and sub-1 ns response time. It is used in industrial power supplies and medical equipment input protection.
For engineers reviewing the SA11A datasheet, pinout, applications, or equivalent options, key selection criteria include verified clamping performance at rated IPP, UL 497B recognition for isolated loop circuits, axial leaded Surmetic package thermal derating behavior, and compatibility with 260°C soldering profiles per JEDEC DO-41 outline.
Technical Context
The SA11A operates as a unidirectional Zener-based TVS diode, conducting only during reverse overvoltage events above its breakdown threshold. Its clamping action relies on avalanche breakdown with low dynamic impedance, enabling fast energy diversion away from protected ICs or connectors.
It is rated for 500 W nonrepetitive peak pulse power (1.0 ms, 8.3 ms half-sine waveform), exhibits 18.2 V maximum clamping voltage at 30.3 A IPP, and maintains <1 µA reverse leakage at 11 V VRWM - confirming stable blocking behavior under normal operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system voltage margin. |
| IPP | 30.3 A - Peak pulse current at which clamping voltage is guaranteed; defines surge handling capacity. |
| VC @ IPP | 18.2 V - Maximum clamped voltage seen by downstream circuitry during rated surge event. |
| Breakdown Voltage (VBR) | 12.2–12.8 V @ IT = 1 mA - Confirmed avalanche onset range; ensures reliable turn-on without premature conduction. |
| Leakage Current | <1 µA @ 11 V - Negligible standby power loss and minimal loading on source circuits. |
| Response Time | <1 ns - Fast enough to protect CMOS inputs and high-speed interfaces from ESD and lightning-induced transients. |
| UL Recognition | UL 497B (QVGV2) - Certified for isolated loop circuit protection; validates reliability in safety-critical telecom and medical systems. |
Pinout & Package
SA11A is housed in an axial-leaded Surmetic plastic package (Case 59AA), compliant with JEDEC DO-41 outline. Cathode is marked by a band; leads are tin-plated, solderable, and rated for 260°C for 10 seconds at 1/16 inch from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Ground reference | Connected to system ground or low-side return path; completes clamping current loop during transient events. |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., +12 V rail); conducts when voltage exceeds VRWM, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W Peak Pulse Power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V DC lines without failure. |
| UL 497B Recognition | Validates suitability for certified isolated loop protection in industrial controllers and medical isolation barriers. |
| ESD Rating >16 kV HBM | Meets or exceeds IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) for board-level ESD immunity. |
| Low Clamping Ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream components compared to higher-ratio TVS devices. |
| Pb-Free Surmetic Package | Complies with RoHS Directive 2011/65/EU and supports lead-free reflow and hand-soldering processes. |
Applications
| Industrial Power Supply Input Protection | Medical Equipment Isolated Interface Protection |
|---|---|
Use Scenario: Protecting 12 V DC input stage of programmable logic controllers (PLCs) against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between input rail and chassis ground to limit voltage excursions to ≤18.2 V. Use Value: Prevents damage to upstream rectifiers and downstream DC-DC converters during 500 W surge events per IEC 61000-4-5. |
Use Scenario: Safeguarding isolated CAN or RS-485 transceivers in patient-monitoring devices connected to external sensors. IC Role / Device Role / Timing Role: Transient suppressor on secondary-side signal lines referenced to isolated ground, certified to UL 497B. Use Value: Maintains galvanic isolation integrity while suppressing ESD and surge energy before it reaches sensitive analog front-ends. |
| Numerical Control System I/O Protection | Business Machine Power Rail Clamping |
Use Scenario: Shielding 24 V digital I/O modules in CNC machines from relay coil flyback and motor drive noise coupling. IC Role / Device Role / Timing Role: Axial-leaded TVS mounted directly at connector entry point to minimize inductance in clamping path. Use Value: Achieves sub-1 ns response with low parasitic inductance, limiting voltage overshoot to safe levels for 3.3 V/5 V logic interfaces. |
Use Scenario: Clamping 12 V auxiliary rails in multifunction printers exposed to AC line disturbances and internal switching noise. IC Role / Device Role / Timing Role: Standalone Zener TVS providing cost-effective, field-proven protection without control logic or biasing. Use Value: Delivers 500 W surge capability in compact axial package, reducing BOM count versus multi-stage protection schemes. |
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 (JEDEC DO-214AC); 400 W peak power; 18.2 V VC @ 22.5 A IPP. | Limited to PCB space-constrained designs; lacks UL 497B certification; lower surge rating reduces margin for repetitive transients. | Choose SMAJ11A only when board area is critical and UL certification is not required. |
| P6KE11A | DO-15 axial package; 600 W peak power; 19.9 V VC @ 30.1 A IPP; no UL 497B listing. | Higher clamping voltage increases stress on protected ICs; wider VBR tolerance (12–13.3 V) reduces design predictability. | Select P6KE11A if higher single-pulse energy handling is needed and UL compliance is not mandated. |
Compared with SMAJ11A and P6KE11A, the SA11A uniquely combines UL 497B certification, precise 11 V VRWM, and 500 W surge capability in a proven axial package - making it preferred for safety-certified industrial and medical power interface protection where regulatory validation is mandatory.
Availability
SA11A is available at Aetrix Electronics and suitable for industrial power supply input protection, medical equipment isolated interface protection, and numerical control system I/O protection requiring stable component supply and long-term lifecycle support.
Supply support for SA11A 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, sensor, and discrete devices for automotive, industrial, and cloud power applications.
The SA11A belongs to the SA5.0A Series MiniMOSORB family - engineered specifically for high-reliability transient suppression in harsh environments, with emphasis on UL-certified isolation barrier protection and robust axial-package thermal performance.
FAQ
What is the clamping voltage of the SA11A at its rated peak pulse current?
The SA11A has a maximum clamping voltage (VC) of 18.2 V at its rated peak pulse current (IPP) of 30.3 A, measured using the 1.0 ms exponential waveform defined in Figure 4 of the datasheet. This value ensures protected circuits experience no more than 18.2 V during standardized surge events, supporting reliable operation of 12 V nominal systems. The SA11A maintains this clamping performance across its qualified temperature range.
Does the SA11A meet UL 497B requirements for isolated loop protection?
Yes, the SA11A is explicitly included in ON Semiconductor's UL 497B recognition (File #E116110, QVGV2 category) for isolated loop circuit protection - confirmed in the "UL RECOGNITION" section on page 5 of the SA5.0A/D datasheet. This certification covers dielectric withstand, endurance conditioning, and strike voltage tests, validating its use in safety-critical medical and industrial isolation barriers. The SA11A carries this qualification as part of the full SA5.0A–SA170A series.
What is the maximum reverse leakage current specification for the SA11A at its working voltage?
The SA11A specifies a maximum reverse leakage current (IR) of <1 µA at its working peak reverse voltage (VRWM) of 11 V, tested at TA = 25°C. This ultra-low leakage minimizes standby power loss and avoids unintended loading of voltage sources or high-impedance sensing nodes. The SA11A achieves this performance through tightly controlled Zener junction processing and is verified across production lots per the electrical characteristics table on page 3.
Can the SA11A be used in surface-mount designs?
No - the SA11A is exclusively offered in an axial-leaded Surmetic plastic package (Case 59AA), conforming to JEDEC DO-41 mechanical outline. It is not available in surface-mount variants. For SMT implementations, engineers should consider functionally similar but package-different alternatives such as SMAJ11A (DO-214AC) or SMCJ11A (DO-214AB), though those lack UL 497B certification and differ in thermal and surge ratings. The SA11A requires through-hole mounting with 260°C soldering profile compliance.
What is the breakdown voltage range for the SA11A, and how is it tested?
The SA11A has a breakdown voltage (VBR) range of 12.2 V (min) to 12.8 V (max), measured at a test current (IT) of 1 mA and ambient temperature of 25°C, as specified in the Electrical Characteristics table on page 3. This narrow 0.6 V spread ensures consistent turn-on behavior across units and simplifies system-level margin analysis. The SA11A's VBR is validated using pulsed DC testing to avoid thermal runaway during measurement, per industry-standard Zener characterization methods.
SA11A 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
SA11A FAQ
1.How can I place an order for SA11A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA11A 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 SA11A reliable?
The price and inventory of SA11A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA11A is usually 5 days.
3.What payment methods are accepted for SA11A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA11A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA11A?
SA11A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA11A 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 SA11A?
For technical support, including SA11A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA11A requirements.
6.How does Aetrix verify that SA11A is sourced from the original manufacturer or authorized distributors?
All SA11A 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 SA11A meets industry standards.
7.What is the process for return or replacement of SA11A?
All SA11A units undergo pre-shipment inspection (PSI). If there is an issue with SA11A, 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 SA11A part is unused and in its original packaging.
Return procedure for SA11A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA11A Tags
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Nexperia USA Inc.
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