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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) - Thyristors > TISP4300H3LM
Bourns Inc.
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TISP4300H3LM

Manufacturer Part Number:
TISP4300H3LM
Manufacturer / Brand
Bourns Inc.
Part of Description:
THYRISTOR 230V 300A TO226-2
Datasheets:
TISP4300H3LM(1).pdfTISP4300H3LM(2).pdf
Lead Free Status / RoHS Status:
RoHS non-compliant
Stock Condition:
New original, 30085 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number TISP4300H3LM
Manufacturer / Brand Bourns Inc.
Stock Quantity 30085 pcs Stock
Category Circuit Protection > Transient Voltage Suppressors (TVS) - Thyristors
Description THYRISTOR 230V 300A TO226-2
Lead Free Status / RoHS Status: RoHS non-compliant
Voltage - On State 3 V
Voltage - Off State 230V
Voltage - Breakover 300V
Supplier Device Package DO-92
Series -
Package / Case TO-226-2, TO-92-2 (TO-226AC)
Package Bulk
Number of Elements 1
Mounting Type Through Hole
Current - Peak Pulse (8/20µs) 300 A
Current - Peak Pulse (10/1000µs) 100 A
Current - Hold (Ih) 150 mA
Capacitance 62pF
Base Product Number TISP4300

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



We accept the payment terms: Telegraphic Transfer(T/T), Credit Card, PayPal and Western Union.

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PayPal Bank Information:
Company Name : IC COMPONENTS LTD
Paypal ID: Info@IC-Components.com

BANK TRANSFAR (Telegraphic Transfer)

Payment For Telegraphic Transfers:
Company Name : IC COMPONENTS LTD Beneficiary Account Number : 549-100669-701
Beneficiary Bank name : Bank of Communications (Hong Kong) Ltd Beneficiary Bank Code : 382 (for local payment)
Beneficiary Bank SWIFT : COMMHKHK
Beneficiary Bank Address : Tsuen Wan Market Street Branch 53 Market Street, Tsuen Wan N.T., Hong Kong

Any inquires or questions, please kindly contact us Email: Info@IC-Components.com


Frequently Asked Questions

Can TISP4300H3LM be used as the primary surge protector on a 230 VAC input, or does it need additional components?
TISP4300H3LM is a crowbar-type TVS thyristor, so it does not absorb surge energy the way a MOV does; it switches low-impedance only after breakover. In a 230 VAC input stage, TISP4300H3LM is typically used with a fuse, thermal cutoff, PTC, or other current-limiting element so the line current drops after triggering. If the source can deliver sustained current, TISP4300H3LM may latch and stay conducting until the current falls below its holding current.
How do I size the series fuse or PTC when using TISP4300H3LM so the protector will reset after a surge?
With TISP4300H3LM, the upstream protection must limit follow current below the device’s holding current once the surge ends. A fuse or PTC should be selected based on the maximum available fault current, the expected surge duration, and the normal line current of the protected circuit. If the line can continue supplying more than the holding current after triggering, TISP4300H3LM can remain latched and keep the line shorted.
Is TISP4300H3LM suitable for RS-485, CAN, USB, or other low-voltage data lines?
TISP4300H3LM is usually not a good fit for low-voltage data interfaces such as RS-485, CAN, or USB because its off-state and breakover levels are far above those signal ranges. It also has about 62 pF capacitance, which can add loading and degrade fast edges on some buses. For those interfaces, a low-capacitance ESD or TVS diode designed for the actual signal voltage is generally a better match than TISP4300H3LM.
Can TISP4300H3LM replace a MOV or a standard TVS diode in an existing design?
TISP4300H3LM can replace another protector only if the circuit can tolerate crowbar behavior. Compared with a MOV, TISP4300H3LM typically offers lower clamping voltage in conduction and lower capacitance, but it does not gracefully absorb energy by itself. Compared with a standard TVS diode, TISP4300H3LM is better suited to line-side protection where the system has enough impedance or a fuse to clear the fault current after triggering.
What should I check before using TISP4300H3LM in industrial equipment with repeated surge events?
For TISP4300H3LM, repeated surge performance depends on the surge waveform, repetition rate, ambient temperature, and how quickly the circuit clears follow current. The 8/20 µs and 10/1000 µs surge ratings describe specific test conditions, so industrial designs should be reviewed against the real surge profile rather than a single peak current number. Also verify PCB spacing, connector placement, and thermal behavior so the protector and adjacent circuitry remain within limits over long service intervals.
Will TISP4300H3LM nuisance-trigger if the normal operating voltage is close to 230 V?
Yes, TISP4300H3LM can misoperate if the normal peak voltage, tolerances, ringing, or line transients approach its off-state level. For circuits that see voltage close to that range, the design should account for mains tolerance, waveform distortion, and transient overshoot. If the steady-state peak can sit near the protector threshold, a higher-voltage device or a different protection topology is usually a better fit than TISP4300H3LM.
Can TISP4300H3LM be used on AC or bidirectional lines, and what circuit arrangement is typical?
TISP4300H3LM can be used on AC or bidirectional lines when the protected node is a high-impedance line that can tolerate crowbar operation. In practice, it is often placed across the line pair or from each conductor to the reference node, depending on isolation and grounding requirements. The key check for TISP4300H3LM is not polarity but whether the upstream circuit can safely clear the surge current after the device turns on.
What PCB layout practices help TISP4300H3LM perform properly during a surge?
For TISP4300H3LM, keep the device physically close to the entry point or connector, and use short, wide traces to reduce inductance in the surge path. The return path, fuse path, and any ground reference should also be low impedance, because trace inductance can raise the voltage seen by downstream ICs during a fast transient. Adequate creepage and clearance should be maintained for the intended surge environment and working voltage.
What should I verify when replacing an older telecom protector with TISP4300H3LM?
When using TISP4300H3LM as a replacement, check the pinout, package style, breakover tolerance, holding current, and surge waveform ratings against the original part. Even when the voltage rating looks similar, a small change in trigger behavior or capacitance can affect line balance, ring-trip behavior, or false triggering in telecom and line-interface circuits. TISP4300H3LM is most straightforward to drop in when the original design already used a 230 V-class crowbar thyristor in a comparable through-hole package.

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TISP4300H3LM

TISP4300H3LM

Bourns Inc.

THYRISTOR 230V 300A TO226-2

In Stock: 30085

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