How to Choose a Thyristor Surge Protector: TISP4015L1BJR-S Selection Guide
Compare three Bourns TISP candidates by protection window, package, documentation, and procurement requirements before requesting an exact-part quote.
Last updated: November 2026
Bottom Line: Choose a thyristor surge protector by checking three things first: its electrical protection window, its exact package and footprint, and the evidence supporting the offered production lot. For TISP4015L1BJR-S, the FindMyChip catalog records 8 V DC off-state voltage, 15 V breakover voltage, and a 2-pin DO-214AA package; these are screening inputs, not a replacement for the manufacturer datasheet. Compare TISP4015L1AJR-S as a separate package candidate and TISP4500H3BJR-S as a different voltage-class candidate. Purchase the exact approved suffix unless engineering has qualified a substitute, and confirm quantity-dependent pricing and availability before committing a build.
1. Select the protection window before comparing prices
The protection window must separate normal operation from the voltage at which protection is required. A buyer needs two boundaries: the highest legitimate circuit voltage and the maximum transient stress the protected circuitry can tolerate. Comparing those boundaries with a protector's manufacturer-defined off-state and breakover characteristics is more useful than searching for the lowest advertised unit price.
The TISP4015L1BJR-S catalog entry describes a bidirectional thyristor overvoltage protector with 8 V DC off-state voltage and 15 V breakover voltage. Those values identify the first questions to ask when screening this exact part. They do not establish the allowable normal operating voltage or guaranteed protection level for an unspecified circuit.
A useful comparison range in this catalog is 15 V versus 500 V: TISP4015L1BJR-S is described with a 15 V breakover figure, while TISP4500H3BJR-S has a 500 V description. Those figures come from separate catalog records and are not confirmed as the same datasheet parameter. They therefore demonstrate why a family-prefix match cannot establish electrical interchangeability.
Create a selection worksheet with the exact symbol, minimum or maximum qualifier, test condition, and source revision for every voltage requirement. Ask engineering to resolve any value whose meaning is unclear before requesting substitute offers. A quotation should carry an explicit approved manufacturer part number rather than a request for an unspecified equivalent TISP device.
2. Compare surge ratings only under matching conditions
A surge-current figure becomes meaningful only when its waveform, duration, repetition conditions, and temperature are known. A larger number on a distributor page does not automatically indicate a stronger replacement. Two entries can report different current definitions while appearing in the same search result.
The available TISP4015L1BJR-S description includes 22 A non-repetitive peak on-state current. The TISP4500H3BJR-S description includes 2 A without enough context to equate it with that 22 A rating. Treat both as catalog screening information, and leave their comparative surge capability unresolved until the manufacturer documentation establishes matching definitions.
There is no defensible universal current range to recommend from these three records. Instead, record the required surge waveform and the corresponding manufacturer rating for each candidate. If a supplier provides only a current number without a waveform or test condition, mark the comparison incomplete.
For procurement, request the full datasheet identifier alongside the proposed alternative. Keep a separate column for application qualification evidence so a purchasing comparison does not silently turn into an engineering approval. A lower-cost offer remains an unqualified alternate until the complete protection requirements have been checked.
3. Match the package drawing and land pattern
The package suffix is a selection constraint because a different outline can change the assembly decision even when the electrical family looks similar. Buyers should compare the manufacturer's dimensional drawing and the approved PCB footprint. A shared pin count alone does not establish a mechanical replacement.
The catalog lists TISP4015L1BJR-S as 2-pin DO-214AA and describes it as SMBJ. It lists TISP4015L1AJR-S as 2-pin DO-214AC and describes an SMA package. That distinction makes the A-suffix entry a separate component-selection candidate, not an automatically interchangeable quotation line.
The available package classes here are DO-214AA and DO-214AC; the records do not provide validated dimensional tolerances. Do not infer pad compatibility from similar names or photographs. Ask engineering to compare the actual drawings, terminal geometry, and assembly requirements against the existing controlled footprint.
For an unchanged production board, keep the originally approved package as a mandatory RFQ field. For a new design, compare package options before freezing the BOM and land pattern. Buying an available package first and resolving its footprint afterward transfers a sourcing problem into the assembly schedule.
4. Keep catalog identity separate from electrical approval
The manufacturer's exact part number is a stronger procurement identifier than a broad catalog category. Search systems can group related protection devices under different labels. Such grouping helps discovery but does not define device behavior or substitution rules.
These three records illustrate the issue: TISP4015L1BJR-S appears under Diode, TISP4015L1AJR-S under Thyristor, and TISP4500H3BJR-S under Integrated Circuit. Their descriptions and manufacturer documentation are more relevant to qualification than those category labels. None of the labels should become a substitute specification.
Use 3 identity checks before accepting an offer: manufacturer name, complete MPN including suffix, and manufacturer datasheet reference. Record any discrepancy between the supplier quotation and the approved BOM. Resolve the discrepancy before price comparison, because two differently specified offers do not represent the same purchase.
For TISP4500H3BJR-S, the catalog's different voltage description is an immediate reason to require a separate electrical review. It may be worth investigating for a different protection requirement. It should not appear as an approved low-cost replacement for TISP4015L1BJR-S merely because both names start with TISP4.
5. Verify operating conditions rather than filling data gaps
Missing operating-condition data is an unresolved requirement, not permission to assume a standard rating. A procurement worksheet should show unknowns explicitly. This prevents a completed-looking spreadsheet from hiding incomplete engineering evidence.
The two TISP4015 records returned for this comparison do not provide temperature endpoints in their summary fields. The TISP4500H3BJR-S record lists -40 to 150 degrees Celsius, but the summary does not establish which temperature parameter those endpoints describe. Do not convert that field into a guaranteed operating-range claim for any of the other devices.
The practical screening range is therefore known versus unverified, rather than a guessed common temperature span. Check the manufacturer definitions for operating, storage, and junction temperature as applicable. Where the project requires documented environmental or material compliance, ask for the exact supporting declaration instead of inferring it from the family name.
A missing value can be acceptable during initial discovery, provided it remains a tracked question. It is unacceptable as an unmarked assumption in a released substitution. Give the supplier a short, specific evidence request so engineering can close each open item without reinterpreting a sales description.
6. Evaluate the offered lot and the delivered cost
Availability and price must be confirmed for the exact offered lot, quantity, and delivery terms. All three catalog records currently carry inquiry-only stock status. That status supports requesting an offer; it does not establish a quantity available for immediate shipment.
The displayed catalog prices span approximately $0.1230 to $0.3227 across these candidates. Those are individual catalog reference figures, not validated price-break ranges or firm offers. They exclude the assumptions a purchasing manager needs to compare a production order fairly.
Ask each supplier for the same 6 commercial fields: quantity, unit price, minimum order quantity, packing format, lead time, and shipment terms. Then identify any separate freight, inspection, or other agreed charges before comparing delivered cost. A cheaper unit line can lose its advantage when its commercial basis differs.
FindMyChip is a Shenzhen-based B2B sourcing platform connecting buyers with 200+ verified distributors. Use its sourcing process to request exact-part offers and supporting lot information, while retaining your own approval requirements. An alternative becomes commercially useful only after its electrical, mechanical, and evidence requirements have been resolved.
Recommended products comparison table
The three candidates below are recommended for structured investigation, with different selection roles rather than a promise of interchangeability. Every value is drawn from the current catalog summary. Unknowns remain visible because no complete manufacturer datasheet comparison has been performed for this guide.
| Product | Catalog voltage information | Catalog package information | Current commercial status | Price reference | Best for |
|---|---|---|---|---|---|
| TISP4015L1BJR-S | 8 V DC off-state; 15 V breakover | 2-pin DO-214AA; described as SMBJ | Inquiry only | $0.1230 displayed; quantity range requires quotation | Exact-MPN sourcing for an already approved BOM, or initial low-voltage screening |
| TISP4015L1AJR-S | Description includes 15 V; full parameter definition requires verification | 2-pin DO-214AC; described as SMA | Inquiry only | $0.1274 displayed; quantity range requires quotation | Evaluating a separate package option during component selection |
| TISP4500H3BJR-S | Description includes 500 V; confirm the manufacturer's parameter definition | 2-pin DO-214AA; described as SMB | Inquiry only | $0.3227 displayed; quantity range requires quotation | Investigating a different voltage-class requirement, with separate qualification |
For an existing TISP4015L1BJR-S BOM, the first row is the procurement starting point. For a new design, the other rows can help expose the package and voltage questions that must be answered before selection. A table is useful for narrowing investigation, but it cannot replace checking the manufacturer document and the project's requirements.
The listed prices should never serve as the sole basis for choosing between these devices. Their catalog descriptions do not establish equivalent protection behavior. Request comparable quotations only after deciding whether the purchase is an exact-part order or a controlled alternative-selection exercise.
Selection decision flowchart
Use this decision sequence to separate exact-part purchasing from a new component-selection decision. Each branch should end with a recorded approval or a clearly assigned open question. That makes the result usable by engineering, purchasing, and incoming inspection.
If the released BOM specifies TISP4015L1BJR-S, then request that exact MPN first. Include the Bourns manufacturer name and full suffix. Else, if this is a new design, define the required normal-voltage and protection boundaries before ranking candidate devices.
If the voltage parameters are not confirmed under the required conditions, then hold the candidate for technical clarification. Else, compare the surge-current definitions and test conditions. Do not proceed on the assumption that 22 A and 2 A in different catalog descriptions are comparable ratings.
If the package differs from the approved footprint, then require a mechanical review. Else, continue to operating-condition and documentation checks. A 2-pin device in another DO-214 outline should remain a separate candidate until engineering approves it.
If a required environmental or operating parameter is absent, then request the manufacturer evidence. Else, record the applicable revision and qualification decision. Keep unresolved fields out of the approved-substitute list.
If the candidate passes engineering review, then compare exact offered lots and delivered costs. Else, keep it in a discovery list and continue an exact-part search. Commercial urgency does not change the approved technical requirements.
If quantity, packing, lead time, and traceability evidence satisfy the purchase requirements, then release the approved line through the normal purchasing process. Else, request clarification or another offer. Preserve the full MPN and the approved supplier documentation with the order record.
Build a procurement-ready comparison sheet
A complete comparison sheet should let a reviewer reconstruct why the chosen offer meets the requirement. Start with one row per exact MPN and supplier offer. Avoid merging two suffixes into a single line to make the comparison appear simpler.
Use four evidence sections: electrical requirements, mechanical requirements, operating conditions, and commercial terms. In each section, distinguish a catalog observation from a manufacturer-confirmed value and from a project-specific approval. This separation is especially helpful when one person gathers offers and another approves substitutions.
For a second-source request, state the desired outcome precisely. An alternate supplier offering the original Bourns MPN is a different sourcing decision from a different component proposed as a substitute. The first primarily changes the supply route; the second requires a component-qualification decision.
Keep the RFQ concise but specific: exact MPN, quantity, desired delivery date, package requirement, accepted packing, and documentation expectations. Add any approved alternatives as separate lines. This makes supplier responses easier to compare and reduces clarification cycles before a production purchase.
FAQ
Can TISP4015L1AJR-S replace TISP4015L1BJR-S?
The catalog does not establish a direct replacement. TISP4015L1AJR-S is listed as 2-pin DO-214AC, while TISP4015L1BJR-S is listed as 2-pin DO-214AA. Confirm both package drawings and all required electrical parameters against manufacturer documentation. Treat the A-suffix part as a separate candidate until engineering approves the footprint and protection behavior; a similar family name or voltage reference is insufficient.
Is TISP4500H3BJR-S a stronger version of the same protector?
That conclusion cannot be drawn from these catalog summaries. TISP4500H3BJR-S has a 500 V description, whereas TISP4015L1BJR-S is described with 8 V off-state and 15 V breakover values. Those entries do not establish equivalent parameter definitions or application fit. Evaluate TISP4500H3BJR-S for its own requirements, and compare manufacturer-defined ratings before treating it as any kind of substitute.
What should an RFQ for TISP4015L1BJR-S include?
Include Bourns, the complete TISP4015L1BJR-S MPN, required quantity, delivery date, approved package, and packing preference. Request a quotation that states minimum order quantity, lead time, shipment terms, and the lot documentation available. The catalog identifies a 2-pin DO-214AA device, so do not accept a package change without review. List approved alternatives separately to prevent a substitute offer from being mistaken for an exact match.
Are the displayed prices and stock descriptions firm offers?
No firm production offer is established by these records. The three entries have inquiry-only stock status, and their displayed price references range from $0.1230 to $0.3227. Confirm the exact quantity, packing, lead time, and shipment terms in a current quotation. Compare delivered cost on the same commercial basis, and retain the supplier's written confirmation rather than assuming a catalog price applies to every order size.
Choose the exact part, then build a defensible offer comparison
TISP4015L1BJR-S is the appropriate sourcing starting point when that exact device is already approved on the BOM. TISP4015L1AJR-S belongs in a separate package-selection review, while TISP4500H3BJR-S belongs in a different voltage-class investigation. Their common prefix helps discovery; the final decision still depends on documented requirements and the complete manufacturer part number.
Start with electrical fit, confirm the mechanical outline, and close the missing evidence before comparing commercial offers. Then request a quotation with your exact MPN, required quantity, delivery target, and approved alternatives. A clear RFQ lets engineering and purchasing assess the same proposed component and the same offered lot.