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Littelfuse SA Series 500W Glass-Passivated TVS Diode
The Littelfuse SA Series is a family of transient voltage suppressor (TVS) diodes engineered to protect sensitive circuits from voltage transients and surge events, available in 10V, 15V, 20V, and 30V reverse standoff voltage (VR/Vso) ratings to match a range of circuit protection requirements. Every SA Series diode is rated for 500W peak pulse capability at a 10x1000µs waveform with a 0.01% duty cycle repetition rate, and each device features a glass passivated junction for reliable clamping performance across the voltage range. The plastic package carries an UL 94V-0 flammability classification, and the SA Series is built with Matte Tin Lead-free plating for RoHS-compliant, halogen-free assembly.
Key Features
- Peak Pulse Power: 500W peak pulse capability at a 10x1000µs waveform, with a 0.01% duty cycle repetition rate for reliable transient suppression across the SA Series.
- Standoff Voltage Range: Available in 10V, 15V, 20V, and 30V reverse standoff voltage (VR/Vso) ratings to support stable circuit protection under normal operating conditions.
- Fast Response: Typically responds in less than 1.0ps from 0 Volts to minimum breakdown voltage (BV min), enabling rapid transient clamping.
- Glass Passivated Junction: Provides consistent electrical characteristics and long-term reliability.
- High-Temperature Soldering Guaranteed: Rated for 265°C for 10 seconds at 0.375" (9.5mm) lead length with 5 lbs (2.3kg) tension.
- Low Incremental Surge Resistance: Delivers excellent clamping capability during surge events.
- Finish: Matte Tin Lead-free plated leads for reliable termination.
- Low Leakage: Low reverse leakage current above the rated standoff voltage for minimal standby current draw.
Certifications & Compliance
- UL 94V-0 Flammability Classified Plastic Package
- RoHS Compliant
- Halogen-Free
Technical Specifications
- Peak Pulse Power: 500W
- Waveform: 10x1000µs
- Duty Cycle: 0.01% repetition rate
- Reverse Standoff Voltage (VR/Vso) Options: 10V, 15V, 20V, 30V
- Max Junction Temperature: 175°C
- Package: Plastic, UL 94V-0 Flammability Classified
- Lead Finish: Matte Tin, Lead-free
- Breakdown voltage and max clamping voltage vary by the selected standoff voltage rating; refer to manufacturer documentation for per-rating values.
Typical Applications
- Circuit Protection Against Voltage Transients and Surges
- Industrial and Commercial Electronic Equipment Protection
- Power Supply and Line Protection Circuits
- Telecommunications Equipment Protection
- Sensitive Component and PCB-Level Surge Protection
Why Littelfuse?
Littelfuse engineers the SA Series with a glass passivated junction and RoHS-compliant, halogen-free construction to deliver dependable transient voltage suppression across the 10V-30V standoff voltage range for demanding electronic applications. With a UL 94V-0 flammability classified package and guaranteed high-temperature soldering performance, the SA Series is built for consistent, code-compliant reliability in professional circuit protection designs.
Manufacturer Resources
Spec Sheet
Product Specs
- Standards:
- RoHS Compliant
- Series:
- SA Series
- Product Type:
- Surge Protection Component
- Voltage Rating:
- 10V-30V
- Product Finish:
- Matte Tin Lead-free
- Listing:
- UL 94V-0
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Surge Protection
Littelfuse LITSA-30 – Frequently Asked Questions
1) Which standoff voltage should I pick for a 12V DC control circuit?
Littelfuse SA Series TVS diodes come in four reverse standoff voltage ratings: 10V, 15V, 20V and 30V, ordered as SA-10, SA-15, SA-20 and SA-30. The standoff rating has to sit above the highest normal operating voltage of the circuit so the diode stays effectively off and draws only its low reverse leakage current. For a nominal 12V rail that means SA-15, not SA-10, since a 12V system commonly runs up above 13V while charging. Breakdown and clamping voltage rise with the standoff rating, so the next size up is the trade-off between staying out of the way in normal operation and clamping closer to the rail during a surge.
2) Is a 500W TVS diode enough protection for an AC power line entry point?
The SA Series is rated 500W peak pulse at a 10x1000 microsecond waveform with a 0.01 percent duty cycle repetition rate, and its standoff ratings top out at 30V. That makes it a board-level device for low-voltage DC rails, signal lines and control circuits downstream of the main protection, not a service-entrance or AC line arrester. If you are protecting a 120V or 240V feed, this is the wrong class of part. Use the SA Series to protect the sensitive electronics behind that primary stage.
3) Do Littelfuse SA Series diodes meet RoHS and halogen-free requirements for our build spec?
The SA Series is RoHS compliant and halogen-free, with Matte Tin lead-free plated leads. The plastic package carries a UL 94V-0 flammability classification. Those three together are what most industrial and institutional build specs are asking for on a through-hole suppressor.
4) How fast does a TVS diode clamp compared with an MOV?
Response time on the SA Series is typically under 1.0 picosecond from 0 volts to minimum breakdown voltage, which is why a TVS diode is used where a fast-rising transient would get past a slower device. It also has low incremental surge resistance, so the clamping voltage stays close to breakdown during the surge event rather than climbing away from it. The glass passivated junction is what holds those characteristics stable over time.
5) What is the exact part number to order a 30V SA Series TVS diode?
SA-30 is the 30V reverse standoff version. The rest of the family is SA-10, SA-15 and SA-20, all 500W peak pulse at the 10x1000 microsecond waveform. The only thing that changes across those four part numbers is the voltage rating, so the package, lead finish and pulse rating stay the same whichever one you standardize on.
6) Can I use these on telecom or data lines, or only on power rails?
Both. Littelfuse lists the SA Series for power supply and line protection circuits, telecommunications equipment protection, industrial and commercial electronic equipment, and component or PCB-level surge protection. The limit is the voltage, not the application: with standoff ratings of 10V through 30V it suits low-voltage rails and signal lines.
7) Where do I find the breakdown and clamping voltage for each SA rating?
Breakdown voltage and maximum clamping voltage change with the standoff rating chosen, so they are published per part number rather than as one figure for the family. The Littelfuse spec sheet and the Littelfuse product catalog carry the per-rating table for SA-10 through SA-30. What is common to all four is the 500W peak pulse rating at 10x1000 microseconds and the 175 degree C maximum junction temperature.
How fast can I get the Littelfuse LITSA-30 delivered?
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Can I return it if it doesn’t work for me?
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Does the Littelfuse LITSA-30 come with a warranty?
Absolutely. The Littelfuse LITSA-30 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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