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onsemi SA40ARL
- Part No.:
- SA40ARL
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
SA40ARL.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:6,151
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Product details
Overview
SA40ARL from onsemi is a unidirectional 500 W peak power MiniMOSORB Zener transient voltage suppressor (TVS) in axial leaded Surmetic package (Case 59AA), rated for 40 V working peak reverse voltage (VRWM), 64.5 V clamping voltage at 7.8 A peak pulse current, and <1 ns response time. It protects voltage-sensitive circuits in industrial power supplies and communication interfaces against ESD and lightning-induced surges.
For engineers reviewing the SA40ARL datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance at 7.8 A IPP, UL 497B certification for isolated loop protection, low leakage (<1 µA @ 40 V), and compatibility with automated tape-and-reel assembly (5000 pcs/reel).
Technical Context
The SA40ARL operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transients above its 44.4–49.1 V breakdown voltage (VBR @ IT = 1 mA). Its thermal resistance (RJL = 33.3 °C/W) and steady-state power dissipation (3.0 W @ TL ≤ 75°C) support reliable operation under sustained surge conditions.
It meets Class 3 ESD immunity (>16 kV HBM), complies with UL 497B for isolated loop circuit protection, and exhibits a temperature coefficient of 46 mV/°C - enabling predictable voltage drift across −55°C to +175°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; matches 36–40 V DC bus or PoE interface rails. |
| VBR (min/typ/max) | 44.4 / 46.55 / 49.1 V @ 1 mA - Ensures consistent avalanche initiation across production lots and temperature. |
| VC @ IPP | 64.5 V @ 7.8 A - Clamping voltage during 1 ms transient; limits downstream IC stress to safe levels in 48 V systems. |
| PPK | 500 W @ 1 ms - Peak surge energy handling capacity per non-repetitive pulse per Figure 4. |
| IR @ VRWM | <1 µA - Negligible leakage current preserves efficiency in high-impedance sensing or bias networks. |
| Response Time | <1 ns - Fast enough to suppress ESD events before logic-level ICs experience latch-up or gate oxide damage. |
| UL Recognition | UL 497B QVGV2 - Certified for use in primary-side isolated loop protectors, not just flammability compliance. |
Pinout & Package
SA40ARL uses an axial-leaded Surmetic plastic package (Case 59AA, similar to DO-204AC/DO-15), with cathode indicated by a polarity band. Leads are solderable up to 230°C for 10 seconds at 1/16 inch from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side reference; completes clamping path during reverse transient. |
| Cathode | Avalanche breakdown terminal | Connected to protected line (e.g., RS-485 bus, DC input); defines VRWM and clamping threshold. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges without degradation when properly heatsinked. |
| UL 497B recognition | Validated for safety-critical isolated loop protection - exceeds basic flammability-only certifications. |
| ESD rating >16 kV HBM | Survives direct human-body model discharges common in manufacturing and field service environments. |
| Low zener impedance | Stable clamping across current range ensures predictable voltage limiting during fast-rising transients. |
| Pb-free (RoHS-compliant) option | SA40ARLG variant available; SA40ARL itself is standard SnPb finish per ON Semi's legacy offering. |
Applications
| Industrial Power Supply Input Protection | RS-485/422 Communication Line Protection |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp positive-going transients. Use Value: Limits voltage excursion to ≤64.5 V during 7.8 A surges, preventing overvoltage failure of upstream rectifiers and downstream DC-DC controllers. |
Use Scenario: Differential data lines of factory-floor RS-485 network subject to cable coupling and ground potential differences. IC Role / Device Role / Timing Role: Line-to-ground TVS on A/B bus lines, referenced to signal ground, suppressing common-mode transients. Use Value: Sub-1 ns response ensures clamping before data eye distortion occurs; UL 497B approval supports certified isolation barrier integrity. |
| Medical Equipment AC/DC Adapter Interface | Automated Test Equipment (ATE) Signal Conditioning Input |
Use Scenario: Secondary-side DC output of medical-grade AC/DC adapter feeding sensitive analog front-end circuitry. IC Role / Device Role / Timing Role: Output rail protector guarding against internal switcher ringing and external ESD injection via connectors. Use Value: <1 µA leakage avoids loading precision voltage references; 40 V VRWM aligns with 36 V nominal output rails. |
Use Scenario: Analog input channel of benchtop ATE digitizer exposed to accidental probe contact or relay bounce. IC Role / Device Role / Timing Role: Front-end unidirectional clamp on signal path to ADC driver, referenced to system ground. Use Value: 64.5 V clamping prevents ADC saturation and input-stage damage while preserving signal fidelity below 40 V full-scale range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Surface-mount SMA package (DO-214AC); 40 V VRWM, 64.5 V VC @ 7.8 A, but lower PPK (400 W). | Requires PCB layout change; better suited for space-constrained, high-density boards vs. through-hole or wire-ended assemblies. | Select SMAJ40A only when SMT assembly is mandatory and 400 W peak power suffices for expected threat level. |
| 1.5KE40A | Through-hole DO-201AE package; same 40 V VRWM and 64.5 V VC, but higher PPK (1500 W) and larger footprint. | Higher surge margin suits harsher environments (e.g., outdoor telecom), but incompatible with tape-and-reel automation used for SA40ARL. | Choose 1.5KE40A where legacy DO-201AE sockets exist or where 1500 W surge headroom is required beyond IEC 61000-4-5 Level 4. |
Compared with SMAJ40A and 1.5KE40A, the SA40ARL uniquely combines axial-leaded tape-and-reel packaging (5000/reel), UL 497B certification, and optimized 500 W/40 V performance for cost-sensitive industrial power and interface protection requiring automated through-hole insertion.
Availability
SA40ARL is available at Aetrix Electronics and suitable for industrial power supply input protection, RS-485 communication line hardening, and medical equipment DC adapter interfaces requiring stable component supply and long-term obsolescence management.
Supply support for SA40ARL 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 supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SA5.0A Series - including SA40ARL - was designed specifically for robust, cost-effective transient suppression in industrial and communications infrastructure, emphasizing UL-certified reliability, axial-leaded manufacturability, and wide VRWM coverage from 5 V to 170 V.
FAQ
What is the clamping voltage of the SA40ARL under maximum surge conditions?
The SA40ARL clamps to 64.5 V when subjected to its rated peak pulse current of 7.8 A (1 ms waveform per Figure 4). This value is guaranteed across production lots and represents the maximum voltage seen by downstream circuitry during transient events, ensuring compatibility with 48 V system components rated for 70 V absolute maximum.
Is the SA40ARL RoHS-compliant and lead-free?
The SA40ARL is supplied in standard SnPb finish. For RoHS-compliant, lead-free assembly, specify SA40ARLG - the identical device in a Pb-free Surmetic package, fully compatible in form, fit, and function with SA40ARL but meeting EU RoHS Directive 2011/65/EU requirements.
Does the SA40ARL meet UL safety standards for circuit protection?
Yes - the SA40ARL carries UL 497B recognition (File #E116110, category QVGV2) for isolated loop circuit protection. This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - exceeding basic package flammability compliance.
What is the maximum steady-state power dissipation for the SA40ARL?
The SA40ARL dissipates up to 3.0 W continuously when lead temperature (TL) is held at or below 75°C with 3/8-inch lead length. Derating begins above 75°C at 30 mW/°C, reaching zero power at 175°C - matching its specified operating junction temperature range.
Can the SA40ARL be used in bidirectional protection applications?
No - the SA40ARL is strictly unidirectional. Its cathode-anode polarity must be oriented to protect against positive transients only. For bidirectional protection (e.g., AC lines or symmetric data buses), use the CA-suffix variants such as SA40CA, which provide symmetrical clamping in both directions.
SA40ARL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SA40ARL FAQ
1.How can I place an order for SA40ARL through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40ARL 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 SA40ARL reliable?
The price and inventory of SA40ARL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40ARL is usually 5 days.
3.What payment methods are accepted for SA40ARL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40ARL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40ARL?
SA40ARL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40ARL 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 SA40ARL?
For technical support, including SA40ARL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40ARL requirements.
6.How does Aetrix verify that SA40ARL is sourced from the original manufacturer or authorized distributors?
All SA40ARL 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 SA40ARL meets industry standards.
7.What is the process for return or replacement of SA40ARL?
All SA40ARL units undergo pre-shipment inspection (PSI). If there is an issue with SA40ARL, 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 SA40ARL part is unused and in its original packaging.
Return procedure for SA40ARL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA40ARL Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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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
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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