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onsemi SA16A
- Part No.:
- SA16A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA16A.pdf
- Description:
- TVS DIODE 16VWM 26VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,946
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Product details
Overview
SA16A from onsemi is a unidirectional 500 W peak power MiniMOSORB Zener transient voltage suppressor (TVS) designed to protect voltage-sensitive circuits from high-energy transients. It features a 16 V working peak reverse voltage (VRWM), 26 V clamping voltage at 19.2 A peak pulse current (IPP), and sub-1 ns response time. It is commonly used in industrial power supplies and communication interface protection.
For engineers reviewing the SA16A datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system DC operating voltage, clamping voltage margin relative to IC absolute maximum ratings, surge current capability under IEC 61000-4-5 waveforms, and UL 497B recognition for isolated loop circuit protection.
Technical Context
The SA16A operates as a unidirectional Zener-based TVS diode, conducting only during negative transients relative to its anode–cathode polarity. Its clamping action begins at breakdown voltage (VBR = 17.8–19.7 V @ IT = 1 mA) and limits transient energy by shunting surge current to ground when reverse voltage exceeds VRWM.
It uses a thermally robust Surmetic axial-leaded package (Case 59AA) with low thermal resistance (RJL = 33.3 °C/W) and is rated for -55°C to +175°C operation. The device meets UL 497B for isolated loop circuit protection and exhibits ESD immunity >16 kV per Human Body Model.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 16 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/typ/max) | 17.8 / 18.75 / 19.7 V @ 1 mA - Defines precise breakdown threshold for design margining |
| VC @ IPP | 26 V @ 19.2 A - Clamping voltage during 1 ms 500 W surge; determines protected IC stress level |
| IPP | 19.2 A - Peak pulse current supported at rated clamping voltage |
| Response Time | < 1.0 ns - Ensures protection before sensitive logic or analog circuitry is damaged |
| Leakage Current | < 1 µA @ VRWM - Minimizes standby power loss and avoids false triggering |
| UL Recognition | UL 497B (QVGV2) - Certified for use in isolated loop telecom and industrial signal lines |
Pinout & Package
SA16A is housed in an axial-leaded Surmetic plastic package (Case 59AA), with cathode identified by a polarity band. Leads are solderable, corrosion-resistant, and rated for 260°C for 10 seconds at 1/16 inch from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference terminal for unidirectional conduction | Connected to system ground or lower-potential rail; defines direction of transient shunting |
| Cathode | Transient input terminal | Connected to protected line (e.g., RS-485 bus, DC input); carries surge current into anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge testing without degradation |
| UL 497B recognition | Validated for safety-critical isolated loop applications including telecom and process control interfaces |
| ESD rating >16 kV HBM | Provides board-level ESD robustness without requiring additional discrete protection |
| Low zener impedance | Ensures stable clamping across temperature and aging, critical for long-term reliability |
| Pb-Free package option | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles |
Applications
| Industrial Power Supply Input Protection | RS-485/422 Data Line Protection |
|---|---|
Use Scenario: Protecting AC/DC converter inputs against lightning-induced surges and load dump transients in factory automation systems. IC Role / Device Role / Timing Role: Standoff TVS diode placed between line and ground, clamping transients before they reach rectifier bridge or controller IC. Use Value: With 26 V clamping at 19.2 A, SA16A prevents overvoltage stress on 24 V-rated input-stage components while surviving repeated 500 W pulses. | Use Scenario: Safeguarding differential serial communication ports in PLC backplanes exposed to EFT and surge events. IC Role / Device Role / Timing Role: Unidirectional TVS connected from each data line (A/B) to ground, suppressing common-mode transients without distorting signal integrity. Use Value: Sub-1 ns response ensures clamping occurs before RS-485 transceivers (e.g., SN65HVD72) experience latch-up or damage during fast-rising transients. |
| Medical Equipment AC Mains Interface | Numerical Control System I/O Protection |
Use Scenario: Shielding isolated AC mains monitoring circuits in diagnostic imaging equipment from conducted surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-side TVS on isolated sensing inputs, referenced to earth ground to limit common-mode voltage excursion. Use Value: UL 497B certification validates SA16A for use in safety-isolated measurement paths where regulatory compliance is mandatory. | Use Scenario: Protecting CNC machine tool I/O modules from inductive switching transients generated by solenoid valves and motor drivers. IC Role / Device Role / Timing Role: Point-of-use TVS on 24 V DC control lines, placed adjacent to connector entry points to minimize inductance in surge path. Use Value: 500 W peak power rating enables reliable suppression of repetitive 100–200 A inductive kick events without parameter drift or failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16A | Same VRWM (16 V) and VC (26 V), but lower peak power (400 W) and SMA package (surface-mount) | Requires PCB redesign for SMT layout; less suitable for high-reliability through-hole industrial assemblies | Choose SMAJ16A only when board space is constrained and surge duty cycle is light |
| P6KE16A | Same VRWM and VC, but higher leakage (5 µA max @ VRWM) and larger DO-15 package (7.6 mm length vs. SA16A's 7.6 mm) | Lacks UL 497B recognition; not certified for isolated loop protection per safety standards | Select P6KE16A only for non-safety-critical, cost-sensitive consumer applications without regulatory requirements |
Compared with SMAJ16A and P6KE16A, SA16A delivers superior surge endurance (500 W), UL 497B certification for safety-critical isolation, and lower leakage-making it the preferred choice for industrial and medical systems requiring validated reliability and compliance.
Availability
SA16A is available at Aetrix Electronics and suitable for industrial power supplies, RS-485 communication interfaces, and medical equipment AC monitoring circuits requiring stable component supply and long-term lifecycle support.
Supply support for SA16A 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 SA16A belongs to the SA5.0A Series MiniMOSORB family-designed specifically for high-reliability transient suppression in harsh industrial environments where surge immunity, safety certification, and thermal stability are critical.
FAQ
What is the clamping voltage of SA16A at its rated peak pulse current?
The SA16A has a maximum clamping voltage (VC) of 26 V at its rated peak pulse current (IPP) of 19.2 A, measured using the 1 ms exponential waveform defined in Figure 4 of the datasheet. This value is critical for ensuring downstream components remain within their absolute maximum voltage ratings during surge events. SA16A maintains this clamping performance across its full operating temperature range (-55°C to +175°C).
Does SA16A meet UL safety standards for circuit protection?
Yes, SA16A is UL recognized under standard UL 497B (File #E116110, category QVGV2) for isolated loop circuit protection. This certification covers tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance. SA16A's UL 497B listing applies specifically to the SA5.0A–SA170A series and confirms suitability for safety-critical telecom and industrial signal isolation applications.
What is the polarity configuration of SA16A and how is it marked?
SA16A is a unidirectional TVS diode with cathode indicated by a visible polarity band on the axial package body. The cathode terminal connects to the protected line (e.g., RS-485 A/B), while the anode connects to system ground. This polarity must be observed during PCB layout to ensure proper clamping behavior-reverse installation will prevent transient suppression and may cause device failure under overvoltage conditions.
How does SA16A compare to bidirectional TVS diodes in surge protection?
SA16A provides unidirectional clamping optimized for DC-biased lines like 24 V power rails or RS-485 buses with defined common-mode voltage. Unlike bidirectional devices, it offers lower leakage (<1 µA @ VRWM) and tighter VBR tolerance (±5%), improving efficiency and noise margin. SA16A should not be substituted for bidirectional types on AC-coupled or floating lines, as it cannot suppress positive-going transients relative to ground.
Is SA16A available in Pb-Free packaging and what is its reflow profile compliance?
Yes, SA16A is available in Pb-Free packaging (suffix "G", e.g., SA16AG), compliant with RoHS Directive 2011/65/EU. Its axial leads are qualified for soldering at 260°C for 10 seconds at 1/16 inch from the case. The device conforms to JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for through-hole assembly and supports standard wave and hand-soldering processes without preconditioning.
SA16A 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):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 19.2A
- 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
SA16A FAQ
1.How can I place an order for SA16A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA16A 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 SA16A reliable?
The price and inventory of SA16A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA16A is usually 5 days.
3.What payment methods are accepted for SA16A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA16A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA16A?
SA16A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA16A 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 SA16A?
For technical support, including SA16A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA16A requirements.
6.How does Aetrix verify that SA16A is sourced from the original manufacturer or authorized distributors?
All SA16A 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 SA16A meets industry standards.
7.What is the process for return or replacement of SA16A?
All SA16A units undergo pre-shipment inspection (PSI). If there is an issue with SA16A, 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 SA16A part is unused and in its original packaging.
Return procedure for SA16A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA16A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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