Equivalent & Substitute Parts for BD745C-S

Part Overview

The BD745C-S (Bourns Inc.) is an NPN bipolar junction transistor intended for high-current, high-voltage applications requiring up to 20A collector current and 110V collector-emitter voltage. It is housed in a SOT-93 (TO-218-3) through-hole package and is classified as obsolete. Due to its discontinued status and existing inventory constraints, engineering teams may require alternative models to satisfy maintenance, replacement, or design continuity in circuits originally specified for BD745C-S.

Key Parameters

Manufacturer Part Number	Manufacturer	Transistor Type	Current - Collector (Ic) (Max)	Voltage - Collector Emitter Breakdown (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Operating Temperature	Mounting Type	Package / Case	RoHS Status	Product Status
BD745C-S	Bourns Inc.	NPN	20 A	110 V	3V @ 5A, 20A	100µA	20 @ 5A, 4V	3.5 W	-65°C ~ 150°C (TJ)	Through Hole	TO-218-3	ROHS3 Compliant	Obsolete

Substitute Part Grouping Explanation

Substitution is determined by matching critical electrical and mechanical parameters. The allowed parameters in this category include: transistor type (NPN), collector current maximum, collector-emitter breakdown voltage maximum, saturation voltage, cutoff current, DC current gain minimum, power rating, operating temperature range, mounting type, package/case, RoHS compliance, and product status. Only parts that strictly align with these fields are considered suitable substitutes for BD745C-S.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	Current - Collector (Ic) (Max)	Voltage - Collector Emitter Breakdown (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Operating Temperature	Mounting Type	Package / Case	RoHS Status	Product Status
BD745C-S	Bourns Inc.	NPN	20 A	110 V	3V @ 5A, 20A	100µA	20 @ 5A, 4V	3.5 W	-65°C ~ 150°C (TJ)	Through Hole	TO-218-3	ROHS3 Compliant	Obsolete
TIP35CG	onsemi	NPN	25 A	100 V	4V @ 5A, 25A	1mA	15 @ 15A, 4V	125 W	-65°C ~ 150°C (TJ)	Through Hole	TO-247-3	ROHS3 Compliant	Active

Engineering Selection Recommendations

Selection between BD745C-S and TIP35CG should be based on product availability and lifecycle status. BD745C-S is marked as obsolete whereas TIP35CG is actively manufactured and supplied. Both devices are listed as ROHS3 compliant, fulfilling environmental and hazardous substance requirements for regulatory adherence. Only substitute parts with explicit compliance and active status should be considered for new designs or replacement commitments.

Frequently Asked Questions (FAQ)

Q1: Which parameters are critical for substituting a BD745C-S transistor?
A1: Substitution is determined by matching transistor type, maximum collector current, maximum collector-emitter voltage, saturation voltage at specified currents, collector cutoff current, minimum DC current gain at specified conditions, power rating, operating temperature range, mounting type, package/case, and RoHS compliance.

Q2: Are package or mounting type differences relevant for substitution?
A2: Package and mounting type must match system mechanical and thermal design requirements. BD745C-S uses TO-218-3 (SOT-93) and TIP35CG uses TO-247-3; verify compatibility according to the installation needs of the assembly.

Q3: Can the TIP35CG be used when BD745C-S is obsolete?
A3: TIP35CG is an active part and is considered as a substitute based strictly on key electrical and mechanical parameters provided.

Q4: Is RoHS compliance maintained with both parts?
A4: Both BD745C-S and TIP35CG are ROHS3 compliant as per provided data.

Q5: What differentiates product status in substitute selection?
A5: BD745C-S is obsolete, meaning it is no longer in production. TIP35CG holds an active status, indicating ongoing availability and support.

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