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onsemi SA33ARLG
- Part No.:
- SA33ARLG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
SA33ARLG.pdf
- Description:
- TVS DIODE 33VWM 53.3VC TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,754
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Product details
Overview
SA33ARLG from onsemi is a unidirectional 500 W peak power MiniMOSORB Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power rails and signal lines. 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, and sub-1 ns response time. It is used in industrial power supplies, medical equipment surge protection, and communication interface line protection.
For engineers reviewing the SA33ARLG datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, UL 497B certification for isolated loop circuits, axial leaded Surmetic package thermal performance, and ESD robustness (>16 kV HBM).
Technical Context
The SA33ARLG operates as a voltage-clamping device in parallel with protected circuitry, conducting only when transient voltage exceeds its breakdown threshold (36.7–40.6 V at 1 mA). Its low zener impedance and fast response ensure minimal overvoltage exposure during 8.3 ms half-sine surges up to 9.4 A.
It is rated for 500 W nonrepetitive peak power per 1.0 ms pulse (per Figure 4), with derating above 25°C ambient and 50°C lead temperature. The device meets UL 497B for isolated loop circuit protection and exhibits a temperature coefficient of 39 mV/°C for VBR drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system rail margin. |
| VBR @ IT = 1 mA | 36.7–40.6 V - Breakdown occurs within this range; defines turn-on threshold under low-current test conditions. |
| VC @ IPP = 9.4 A | 53.3 V - Clamped voltage during full-rated surge; determines worst-case overvoltage seen by downstream ICs. |
| IPP | 9.4 A - Peak pulse current capability at 53.3 V clamp; supports IEC 61000-4-5 Level 3/4 surge immunity. |
| Leakage @ VRWM | <1 µA - Negligible standby power loss and signal integrity impact in high-impedance circuits. |
| Response Time | <1 ns - Fast enough to suppress ESD and lightning-induced transients before damage occurs. |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Certified for use in isolated loop protectors, not just flammability compliance. |
Pinout & Package
SA33ARLG 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during transient events. |
| Cathode | High-side clamping terminal | Connected to protected line (e.g., +3.3V rail); conducts surge current to ground when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Supports high-energy transients (e.g., IEC 61000-4-5 2 Ω/12 Ω coupling) without failure. |
| UL 497B recognition | Validated for safety-critical isolated loop protection-beyond basic flammability rating. |
| ESD rating >16 kV (HBM) | Withstands human-body-model ESD events without parameter shift or degradation. |
| Low zener impedance | Ensures tight clamping voltage control across varying surge currents and temperatures. |
| Pb-free Surmetic package | RoHS-compliant axial construction with corrosion-resistant finish and reliable solder wetting. |
Applications
| Industrial Power Supply Protection | Medical Equipment Surge Suppression |
|---|---|
Use Scenario: Protecting 24–48 V DC input rails in programmable logic controllers against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Standby clamping diode placed across input terminals, activated only during overvoltage events. Use Value: Limits transient voltage to ≤53.3 V, preventing damage to upstream rectifiers and downstream DC-DC controllers. |
Use Scenario: Safeguarding patient-connected analog front-end signal lines (e.g., ECG leads) from ESD and defibrillator-induced surges. IC Role / Device Role / Timing Role: Low-capacitance (<10 pF typical), high-speed shunt protector on isolated sensor inputs. Use Value: Maintains signal fidelity while meeting IEC 60601-1-2 ESD immunity requirements via sub-1 ns response and UL 497B isolation compliance. |
| Communication Interface Line Protection | Process Control Signal Conditioning |
Use Scenario: Shielding RS-485 transceiver I/O pins from lightning-induced surges in factory automation networks. IC Role / Device Role / Timing Role: Unidirectional TVS mounted between differential pair and ground, referenced to local chassis ground. Use Value: Clamps common-mode transients to ≤53.3 V without affecting 33 V common-mode range or data integrity. |
Use Scenario: Protecting 4–20 mA current loop receivers in hazardous-area transmitters from wiring fault transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on loop supply input, coordinated with intrinsically safe barrier design. Use Value: Enables compliance with IEC 60079-11 intrinsic safety standards through predictable clamping and UL 497B-certified isolation behavior. |
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), slightly higher VC (53.5 V @ 9.2 A), SMA surface-mount package. | Requires PCB rework for SMT layout; lacks UL 497B certification for isolated loops. | Select when board space is constrained and UL 497B is not required for the application. |
| Vishay 1.5KE33A | Higher PPK (1500 W), larger DO-201 package, same VRWM (33 V), VC = 53.3 V @ 28.3 A. | Better surge handling but slower response (~1.5 ns); no UL 497B listing. | Choose for higher-energy surge environments where axial lead mechanical robustness is prioritized over speed or safety certification. |
Compared with SMAJ33A and 1.5KE33A, SA33ARLG uniquely combines UL 497B certification, sub-1 ns response, and Pb-free axial packaging-making it preferred for certified industrial and medical isolated-loop designs where regulatory compliance and fast clamping are jointly critical.
Availability
SA33ARLG is available at Aetrix Electronics and suitable for industrial power supplies, medical diagnostic equipment, and RS-485 communication systems requiring stable component supply and long-term lifecycle support.
Supply support for SA33ARLG 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, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SA5.0A Series-including SA33ARLG-is part of onsemi's MiniMOSORB TVS portfolio, engineered specifically for high-reliability transient suppression in safety-critical and regulated applications such as medical devices and industrial control systems.
FAQ
What is the clamping voltage of SA33ARLG at its rated peak pulse current?
The SA33ARLG has a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current (IPP) of 9.4 A, measured per the 8.3 ms half-sine waveform defined in Figure 4 of the datasheet. This value ensures predictable overvoltage limiting during standardized surge events and is validated across production lots per onsemi's qualification testing. SA33ARLG maintains this clamping performance with minimal variation over temperature and lifetime.
Does SA33ARLG meet UL 497B for isolated loop protection?
Yes, SA33ARLG is explicitly included in onsemi's UL 497B recognition (File #E210057, Category QVGQ2) for isolated loop circuit protection. This certification covers dielectric withstand, endurance conditioning, and strike voltage breakdown tests-not just package flammability. SA33ARLG is approved for use in safety-isolated interfaces where regulatory compliance is mandatory, unlike many competing TVS diodes that lack full UL 497B coverage.
What is the package type and lead configuration of SA33ARLG?
SA33ARLG uses the axial-leaded Surmetic plastic package (Case 59AA), with cathode identified by a visible polarity band. Leads are straight, tinned, and compliant with RoHS and JEDEC DO-41 dimensional standards. The "RLG" suffix denotes Pb-free construction supplied in tape-and-reel format (5000 units per reel), optimized for automated insertion and high-reliability soldering at 260°C for 10 seconds.
How does SA33ARLG compare to bidirectional TVS diodes in surge protection?
SA33ARLG is unidirectional and optimized for DC-biased lines (e.g., +33 V rails), offering lower leakage (<1 µA) and tighter clamping than bidirectional equivalents at the same VRWM. Bidirectional variants (e.g., SA33CA) are suited for AC or floating signals but exhibit higher capacitance and leakage. SA33ARLG's design avoids unnecessary conduction during normal negative excursions, improving efficiency and noise immunity in single-polarity systems.
What is the maximum operating temperature range for SA33ARLG?
SA33ARLG is rated for an operating and storage temperature range of −55°C to +150°C, with thermal resistance (Junction-to-Lead) of 33.3°C/W. Derating applies above 50°C lead temperature for steady-state power dissipation, and peak pulse power must be reduced per Figure 2 in the datasheet when ambient exceeds 25°C. SA33ARLG maintains full specification compliance across this full range when mounted per recommended lead length (3/8″) and thermal relief guidelines.
SA33ARLG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V (Max)
- 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:
- Surface Mount
- Supplier Device Package:
- PG-TO252-3-11
SA33ARLG FAQ
1.How can I place an order for SA33ARLG through Aetrix?
Please submit a Request for Quotation (RFQ) for SA33ARLG 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 SA33ARLG reliable?
The price and inventory of SA33ARLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA33ARLG is usually 5 days.
3.What payment methods are accepted for SA33ARLG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA33ARLG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA33ARLG?
SA33ARLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA33ARLG 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 SA33ARLG?
For technical support, including SA33ARLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA33ARLG requirements.
6.How does Aetrix verify that SA33ARLG is sourced from the original manufacturer or authorized distributors?
All SA33ARLG 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 SA33ARLG meets industry standards.
7.What is the process for return or replacement of SA33ARLG?
All SA33ARLG units undergo pre-shipment inspection (PSI). If there is an issue with SA33ARLG, 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 SA33ARLG part is unused and in its original packaging.
Return procedure for SA33ARLG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA33ARLG Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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