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onsemi SA24ARL
- Part No.:
- SA24ARL
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA24ARL.pdf
- Description:
- TVS DIODE 24VWM 38.9VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,524
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Product details
Overview
SA24ARL from ON Semiconductor is a unidirectional MiniMOSORB Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in power and signal lines. It features a 24 V working peak reverse voltage (VRWM), 38.9 V maximum clamping voltage at 12.8 A peak pulse current, 500 W peak pulse power (1 ms), <1.0 ns response time, and UL 497B recognition for isolated loop circuit protection.
For engineers reviewing the SA24ARL datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM matching system DC bias, clamping voltage margin relative to protected IC VMAX, surge current capability under IEC 61000-4-5 waveforms, and axial leaded Surmetic package compatibility with through-hole PCB layouts.
Technical Context
The SA24ARL operates as a voltage-clamping device that remains high-impedance below VRWM = 24 V and rapidly avalanches above VBR = 26.7–29.5 V to limit transient overvoltage. Its low zener impedance and fast <1.0 ns response ensure effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges.
Thermal design relies on junction-to-lead resistance of 33.3 °C/W and steady-state power dissipation of 3.0 W at TL ≤ 75°C, with derating above that temperature. The device is rated for operation from –55°C to +175°C and supports forward surge current up to 70 A (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 24 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT = 1 A | 26.7–29.5 V - Breakdown voltage range defining reliable avalanche onset |
| VC @ IPP = 12.8 A | 38.9 V - Clamped voltage during 1 ms 500 W transient, critical for IC overvoltage margin |
| IPP | 12.8 A - Peak pulse current corresponding to full 500 W rating at 1 ms |
| Response Time | <1.0 ns - Enables suppression of nanosecond-scale ESD events before damage occurs |
| Leakage Current @ VRWM | <1 µA - Negligible standby power loss and minimal loading on sensitive analog/sensor circuits |
| UL Recognition | UL 497B (QVGV2) - Certified for isolated loop circuit protection per safety standard |
Pinout & Package
SA24ARL is housed in ON Semiconductor's Surmetic axial-leaded plastic package (Case 59AA), featuring corrosion-resistant leads, void-free transfer-molded thermosetting body, and cathode polarity indicated by a band. Lead temperature tolerance is 260°C for 10 seconds at 1/16 inch from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side of protected line; enables bidirectional surge handling only when paired with complementary device |
| Cathode | Current exit point during reverse avalanche | Marked with band; connected to higher-potential side (e.g., VCC, signal line); defines unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Sustains IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge without degradation |
| UL 497B recognition | Validated for use in safety-critical isolated communication interfaces (e.g., RS-485, CAN bus) |
| ESD rating >16 kV HBM | Protects downstream logic from human-body model discharges without external shielding |
| Low zener impedance | Maintains tight clamping voltage across varying surge currents, reducing overshoot risk |
| Pb-Free (RoHS-compliant) | Meets global environmental compliance requirements for industrial and medical equipment |
Applications
| Industrial Power Supply Input Protection | Medical Equipment ESD Shielding |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 24 V rail and chassis ground to shunt surge energy away from upstream rectifier and downstream regulator ICs. Use Value: Limits transient voltage to ≤38.9 V, preserving 40 V-rated input capacitors and preventing latch-up in 3.3 V/5 V LDOs downstream. | Use Scenario: Front-panel USB and serial ports on diagnostic imaging equipment subject to clinical ESD events. IC Role / Device Role / Timing Role: Board-level ESD suppressor on shielded cable connectors, mounted adjacent to interface ICs (e.g., MAX3232, TJA1050). Use Value: Absorbs >16 kV HBM discharges within <1 ns, eliminating need for additional RC filtering and maintaining signal integrity on 115.2 kbps UART lines. |
| Process Control Sensor Interface | Telecom Line Card Surge Protection |
Use Scenario: 4–20 mA current-loop sensor node in chemical plant environment with lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Reverse-biased TVS across loop terminals (anode to return, cathode to supply) to clamp common-mode surges exceeding 24 V. Use Value: Maintains loop accuracy by limiting leakage to <1 µA at 24 V, while surviving repeated 500 W transients per UL 497B endurance testing. | Use Scenario: Primary protection stage on RJ-45 Ethernet port of remote terminal unit (RTU) deployed in outdoor cabinet. IC Role / Device Role / Timing Role: First-line unidirectional suppressor on each differential pair, referenced to local ground plane before isolation transformer. Use Value: Provides certified UL 497B isolation barrier protection, enabling compliance with IEC 61000-4-5 surge immunity up to 2 kV (line-earth) without secondary protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Surface-mount DO-214AC package; same VRWM and VC, but lower IPP (12.3 A vs. 12.8 A) and 400 W peak power | Requires rework of PCB layout for SMT assembly; unsuitable for high-vibration environments where axial leads provide mechanical robustness | Select SMAJ24A only when board space constraints prohibit axial components and thermal coupling to copper pour is optimized |
| P6KE27A | Higher VRWM (27 V); VC = 41.4 V at 12.1 A; same 500 W rating but slower response (~1.5 ns) and no UL 497B certification | Lacks safety certification for isolated loop use; requires higher clamping margin, reducing protection headroom for 24 V systems | Choose P6KE27A only if VRWM margin must exceed 24 V and UL compliance is not required |
Compared with SMAJ24A and P6KE27A, SA24ARL uniquely combines axial mechanical reliability, UL 497B certification, and precise 24 V clamping performance-making it optimal for safety-critical industrial and medical designs where regulatory validation and mounting stability are mandatory.
Availability
SA24ARL is available at Aetrix Electronics and suitable for industrial power supplies, medical diagnostic equipment, process control instrumentation, and telecom line cards requiring stable component supply and long-term lifecycle support.
Supply support for SA24ARL 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, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The SA5.0A Series-including SA24ARL-is part of ON Semiconductor's MiniMOSORB TVS family, engineered specifically for robust, certified transient suppression in harsh industrial and safety-regulated environments.
FAQ
What is the maximum clamping voltage of the SA24ARL under a 500 W transient?
The SA24ARL clamps to a maximum of 38.9 V when subjected to its rated 12.8 A peak pulse current (corresponding to 500 W at 1 ms). This value is measured per Figure 4 waveform in the official SA5.0A/D datasheet and defines the upper voltage limit imposed on protected circuitry during surge events. Designers must verify that this clamping level remains below the absolute maximum ratings of downstream components. The SA24ARL achieves this performance with low dynamic impedance and sub-nanosecond response.
Does the SA24ARL meet UL 497B requirements for isolated loop protection?
Yes, the SA24ARL is explicitly included in ON Semiconductor's UL 497B recognition (File #E116110, QVGV2 category) for isolated loop circuit protection. This certification covers endurance, dielectric withstand, discharge, and strike voltage breakdown testing-validating its suitability in safety-isolated interfaces such as RS-485, CAN, and analog sensor loops. The SA24ARL shares this qualification with the full SA5.0A–SA170A series, as confirmed in the July 2007 Rev. 12 datasheet.
What is the leakage current specification for SA24ARL at its working voltage?
The SA24ARL specifies a maximum reverse leakage current of 1 µA at its working peak reverse voltage (VRWM) of 24 V and ambient temperature of 25°C. This ultra-low leakage ensures minimal power loss and negligible loading on precision 24 V sensor bias networks or high-impedance analog inputs. The value is verified per the electrical characteristics table on page 3 of the SA5.0A/D datasheet and remains stable across the –55°C to +175°C operating range.
Can SA24ARL be used in bidirectional transient protection configurations?
No, the SA24ARL is a unidirectional TVS diode and is not rated for bidirectional operation. It conducts only during reverse avalanche (cathode positive relative to anode) and blocks forward current up to 3.5 V. For bidirectional protection, two SA24ARL devices must be connected in series opposition-or a dedicated bidirectional part such as the SA24A (not SA24ARL) should be selected. The "R" in SA24ARL denotes tape-and-reel packaging, not functional revision.
What is the thermal resistance from junction to lead for SA24ARL?
The SA24ARL has a specified thermal resistance of 33.3 °C/W from junction to lead (RJL). This parameter governs heat dissipation during repetitive surge events and determines safe steady-state power handling: at lead temperature (TL) ≤ 75°C, the device supports 3.0 W continuous dissipation, derating linearly above that threshold. This value is measured under standardized test conditions defined in the "Maximum Ratings" table on page 2 of the SA5.0A/D datasheet.
SA24ARL 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 12.8A
- 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
SA24ARL FAQ
1.How can I place an order for SA24ARL through Aetrix?
Please submit a Request for Quotation (RFQ) for SA24ARL 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 SA24ARL reliable?
The price and inventory of SA24ARL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA24ARL is usually 5 days.
3.What payment methods are accepted for SA24ARL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA24ARL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA24ARL?
SA24ARL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA24ARL 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 SA24ARL?
For technical support, including SA24ARL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA24ARL requirements.
6.How does Aetrix verify that SA24ARL is sourced from the original manufacturer or authorized distributors?
All SA24ARL 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 SA24ARL meets industry standards.
7.What is the process for return or replacement of SA24ARL?
All SA24ARL units undergo pre-shipment inspection (PSI). If there is an issue with SA24ARL, 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 SA24ARL part is unused and in its original packaging.
Return procedure for SA24ARL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA24ARL Tags
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