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onsemi SA33ARL
- Part No.:
- SA33ARL
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA33ARL.pdf
- Description:
- TVS DIODE 33VWM 53.3VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,478
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Product details
Overview
SA33ARL from ON Semiconductor is a unidirectional 500 W peak power MiniMOSORB Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power lines and signal paths. It features a 33 V working peak reverse voltage (VRWM), 53.3 V maximum clamping voltage at 9.4 A peak pulse current, <1 µA leakage at VRWM, <1 ns response time, and UL 497B recognition for isolated loop circuit protection - deployed in industrial power supplies and medical equipment surge protection.
For engineers reviewing the SA33ARL datasheet, pinout, applications, or equivalent options, key selection criteria include verified clamping performance at 9.4 A IPP, axial leaded Surmetic package compatibility with through-hole assembly, temperature coefficient of ±0.085 %/°C for VBR stability, and compliance with Class 3 ESD (>16 kV HBM).
Technical Context
The SA33ARL operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transient overvoltages above its 36.7–40.6 V breakdown range. Its low zener impedance and sub-1 ns response enable effective suppression of fast-rising EFT and lightning-induced surges in primary-side power rails.
It is rated for 500 W nonrepetitive peak pulse power per 1 ms waveform (Figure 4), with thermal derating to 3.0 W steady-state dissipation at TL ≤ 75°C and junction-to-lead thermal resistance of 33.3 °C/W. UL 497B recognition confirms suitability for isolated loop protection in safety-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system DC rail rating. |
| VBR @ IT=1 mA | 36.7–40.6 V - Breakdown voltage tolerance band; defines turn-on threshold under standardized test conditions. |
| VC @ IPP=9.4 A | 53.3 V - Clamped voltage during 1 ms transient; determines maximum stress on downstream components. |
| IPP | 9.4 A - Peak pulse current capability at rated clamping voltage; validates 500 W surge handling per Figure 4. |
| Response time | <1 ns - Enables suppression of nanosecond-scale transients such as ESD and fast EFT bursts. |
| Leakage @ VRWM | <1 µA - Ensures minimal standby power loss and no interference with low-current sensing circuits. |
| Temp. coeff. of VBR | ±0.085 %/°C - Predictable VBR drift over -55°C to +175°C operating range; supports thermal design margining. |
Pinout & Package
SA33ARL 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 inch from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for unidirectional clamping | Connected to ground or low-impedance return path; defines directionality of transient shunting. |
| Cathode | Transient input / protected line connection | Connected to the line being protected (e.g., +33 V rail); avalanche conduction occurs from cathode to anode. |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop circuit protection - enables use in certified medical and industrial safety subsystems without additional qualification. |
| ESD Rating (HBM) | Class 3 (>16 kV) - Provides robust immunity to human-body model ESD events during handling and operation. |
| Pb-Free Surmetic Package | RoHS-compliant axial lead construction with void-free transfer-molded thermoset plastic - ensures long-term reliability and solderability. |
| Low Clamping Ratio | VC/VRWM = 1.61 - Minimizes overvoltage overshoot relative to working voltage, reducing stress on downstream ICs and regulators. |
| High Surge Capability | 500 W peak power @ 1 ms - Handles IEC 61000-4-5 Level 4 surge waveforms (4 kV/2 Ω) in single-pulse applications. |
Applications
| Industrial Power Supply Protection | Medical Equipment Input Stage |
|---|---|
|
Use Scenario: Protecting AC/DC adapter outputs and DC distribution rails against lightning-induced surges and load dump transients. IC Role / Device Role / Timing Role: Unidirectional clamping device placed across +33 V output and ground to limit transient excursions. Use Value: Limits voltage to ≤53.3 V during 9.4 A surges, preventing damage to downstream 3.3 V/5 V LDOs and microcontrollers. |
Use Scenario: Safeguarding patient-connected analog front-end inputs in diagnostic imaging systems against ESD and defibrillator discharge coupling. IC Role / Device Role / Timing Role: Primary-level TVS on isolated sensor supply lines compliant with UL 497B requirements. Use Value: UL 497B certification and <1 µA leakage ensure safety compliance and signal integrity in low-power biopotential circuits. |
| Process Control I/O Module | Numerical Control System Power Bus |
|
Use Scenario: Protecting 24 V digital I/O channels in PLC modules exposed to inductive switching noise and field wiring transients. IC Role / Device Role / Timing Role: Line-to-ground TVS on each channel's power rail, mounted near connector entry point. Use Value: Sub-1 ns response captures fast edge transients from relay coils and solenoids, avoiding latch-up in interface ICs. |
Use Scenario: Shielding CNC machine main power bus (33 V auxiliary supply) from motor drive commutation spikes and regenerative energy surges. IC Role / Device Role / Timing Role: Bulk transient suppressor across bus terminals, coordinated with upstream fusing. Use Value: 500 W peak power rating absorbs multi-cycle 1 ms surges without degradation, supporting EN 61800-3 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ33A | Same VRWM (33 V), higher VC (53.5 V), identical 500 W rating, SMA surface-mount package | Requires PCB redesign for SMT vs. axial through-hole; lacks UL 497B recognition | Choose for space-constrained designs where board area is critical and UL certification is not required. |
| Vishay 1.5KE33A | Same VRWM (33 V), slightly lower VC (53.0 V), 1500 W rating, DO-201 axial package | Higher surge capacity but larger case (DO-201 vs. Case 59AA); no UL 497B listing | Choose when higher single-pulse energy absorption is needed and UL 497B compliance is optional. |
Compared with SMAJ33A and 1.5KE33A, SA33ARL offers UL 497B certification and a compact Surmetic axial package optimized for manual and wave-solder assembly - making it preferred for safety-certified industrial and medical power interfaces where regulatory validation and process compatibility are mandatory.
Availability
SA33ARL is available at Aetrix Electronics and suitable for industrial power supplies, medical equipment input stages, and numerical control system power buses requiring stable component supply, RoHS compliance, and UL-recognized surge protection.
Supply support for SA33ARL 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 supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SA33ARL belongs to the SA5.0A Series MiniMOSORB TVS family, engineered specifically for high-reliability transient suppression in safety-critical industrial and medical systems - emphasizing UL 497B compliance, tight VBR tolerance, and robust surge endurance.
FAQ
What is the clamping voltage of SA33ARL at its rated peak pulse current?
The SA33ARL has a maximum clamping voltage (VC) of 53.3 V at 9.4 A peak pulse current (IPP), measured per the 1 ms exponential waveform defined in Figure 4 of the datasheet. This value ensures predictable overvoltage limiting for downstream 3.3 V and 5 V logic circuits when used in conjunction with appropriate series impedance.
Is SA33ARL certified for safety-critical applications like medical equipment?
Yes, SA33ARL carries UL 497B recognition (File #E116110, QVGV2 category) for isolated loop circuit protection - a requirement for many Class II medical devices and industrial safety systems. This certification covers strike voltage breakdown, endurance conditioning, and dielectric withstand testing, distinguishing it from generic TVS diodes lacking third-party safety validation.
What package type does SA33ARL use, and what are its mechanical dimensions?
SA33ARL uses ON Semiconductor's Surmetic axial-leaded Case 59AA package. Key dimensions: body length 5.80–7.60 mm, body diameter 2.60–3.60 mm, lead diameter 0.71–0.86 mm, and overall length ≥25.44 mm. The cathode is marked by a visible band, and leads are tin-plated for reliable soldering at 260°C for 10 seconds.
How does SA33ARL compare to bidirectional TVS diodes in surge protection design?
SA33ARL is unidirectional and intended for DC line protection where polarity is fixed - offering lower leakage (<1 µA) and tighter VBR tolerance than comparable bidirectional parts. Unlike bidirectional TVS diodes, it cannot protect AC signals or floating lines, but delivers superior performance in regulated DC rails like 33 V auxiliary supplies in industrial controllers.
Does SA33ARL meet RoHS and lead-free requirements?
Yes, SA33ARL is supplied in a Pb-Free Surmetic package (denoted by the "RLG" suffix), fully compliant with RoHS Directive 2011/65/EU. The device uses lead-free terminations and void-free thermosetting plastic encapsulation, qualified per J-STD-020 moisture sensitivity level 1 and compatible with standard reflow and wave-solder processes.
SA33ARL 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 9.4A
- 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
SA33ARL FAQ
1.How can I place an order for SA33ARL through Aetrix?
Please submit a Request for Quotation (RFQ) for SA33ARL 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 SA33ARL reliable?
The price and inventory of SA33ARL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA33ARL is usually 5 days.
3.What payment methods are accepted for SA33ARL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA33ARL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA33ARL?
SA33ARL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA33ARL 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 SA33ARL?
For technical support, including SA33ARL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA33ARL requirements.
6.How does Aetrix verify that SA33ARL is sourced from the original manufacturer or authorized distributors?
All SA33ARL 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 SA33ARL meets industry standards.
7.What is the process for return or replacement of SA33ARL?
All SA33ARL units undergo pre-shipment inspection (PSI). If there is an issue with SA33ARL, 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 SA33ARL part is unused and in its original packaging.
Return procedure for SA33ARL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA33ARL Tags
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