Equivalent & Substitute Parts Reference for BD545C-S

Part Overview

The BD545C-S is a bipolar (BJT) NPN Darlington transistor from Bourns Inc., featuring a maximum collector-emitter voltage of 100 V, collector current up to 15 A, power dissipation of 3.5 W, and a through-hole SOT-93 package. It is currently designated as obsolete, necessitating identification of suitable alternative models. Substitute selection ensures continuity in applications requiring the same key electrical and mechanical specifications.

Substiute Parts

BD545C-S

Bourns Inc.In Stock: 722BD545C-S Datasheet

Current PartRFQ

TIP35CG

onsemiIn Stock: 1338TIP35CG Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for BD545C-S are determined strictly by electrical and mechanical parameters provided: transistor type (NPN), collector-emitter voltage rating, maximum collector current, power dissipation, saturation voltage, cutoff current, DC current gain, operating temperature range, mounting type, and package compatibility. Substitution is limited to components within the Transistors, Bipolar (BJT) category offering matching or exceeding those specifications, with compliance and moisture sensitivity levels considered for reliability.

Parameter Comparison

Engineering Selection Recommendations

The BD545C-S is obsolete and no longer available in new production. For compliance with RoHS regulations and unlimited moisture sensitivity rating, only substitutes that provide similar or stricter certifications and product status should be considered. TIP35CG from onsemi is active, ROHS3 compliant, and matches essential certification parameters, meeting necessary regulatory and lifecycle requirements for substitution.

Frequently Asked Questions (FAQ)

Q1: What electrical parameters must be matched when selecting a substitute for BD545C-S?
Substitution requires matching transistor type, collector-emitter voltage, maximum collector current, saturation voltage, cutoff current, DC current gain, and power dissipation.

Q2: Is package compatibility important when substituting BD545C-S?
Yes. The original TO-218-3 (SOT-93) package must be considered against the substitute’s TO-247-3 package due to differences in form factor and mounting footprint.

Q3: Does the moisture sensitivity level affect substitute selection?
Yes. BD545C-S features MSL 1 (Unlimited). Substitute selection must meet or exceed this MSL rating for comparable assembly and reliability.

Q4: What regulatory certifications should be met by substitutes?
Substitutes must be ROHS3 compliant, matching the environmental compliance status of BD545C-S.

Q5: Are the substitute parameters appropriate for direct replacement?
Substitute parameters must strictly match or exceed the key specifications as detailed above, including electrical ratings and compliance certifications.

Q6: How does the obsolete status of BD545C-S affect component selection?
Obsolete status necessitates finding substitutes that are active and available in inventory with equivalent or higher performance and compliance characteristics.