BD646-S Equivalent & Substitute Parts Reference

Part Overview

BD646-S is a PNP Darlington bipolar junction transistor manufactured by Bourns Inc., classified under the Transistors, Bipolar (BJT) category. It features a collector-emitter breakdown voltage of 60 V, a collector current rating of 8 A, and is designed for through-hole mounting in a TO-220-3 package. The maximum power dissipation rating is 2 W. With the device status marked as obsolete, the necessity arises to identify suitable alternative models to ensure continuity in designs, repairs, and supply chains wherever BD646-S has been specified.

Substiute Parts

BD646-S

Bourns Inc.In Stock: 4185BD646-S Datasheet

Current PartRFQ

TIP105

NTE Electronics, IncIn Stock: 44255TIP105 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute relationships for BD646-S are determined strictly by matching the allowed electrical and mechanical parameters relevant to the Transistors, Bipolar (BJT) product category. The considered parameters for substitution include transistor type (PNP - Darlington), maximum collector current, maximum collector-emitter breakdown voltage, Vce saturation, DC current gain (hFE), package/case type, and mounting method. Only parts that fulfill these requirements can be classified as direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

BD646-S is obsolete, with ROHS3 compliant status. The substitute part TIP105 is active but is classified as RoHS non-compliant. Selection between BD646-S and TIP105 should be based solely on availability and compliance requirements. If RoHS compliance is mandatory in the application, BD646-S must be used where available. Otherwise, TIP105 is a direct substitute based on the provided parameters.

Frequently Asked Questions (FAQ)

Q1: What are the key electrical criteria for substituting BD646-S in a design?
A1: The critical parameters are transistor type (PNP - Darlington), collector-emitter breakdown voltage (60 V), collector current rating (8 A), DC current gain (hFE), Vce saturation, and package/case type (TO-220-3).

Q2: Is TIP105 mechanically compatible with BD646-S?
A2: TIP105 utilizes the same through-hole mounting and TO-220-3 package/case as BD646-S.

Q3: Are power dissipation and gain limitations important in substitution?
A3: Only the stated values provided are considered. Both devices are PNP Darlington transistors and share identical voltage and current ratings, with TIP105 offering higher DC current gain and power handling as per the listed parameters.

Q4: What compliance factors must be considered when selecting between BD646-S and TIP105?
A4: BD646-S is ROHS3 compliant and obsolete. TIP105 is active but not RoHS compliant. Selection must adhere to compliance requirements specified for the application.

Q5: Can substitute parts be used interchangeably without testing?
A5: Substitution is based strictly on provided electrical and mechanical parameters; compatibility is determined by matching these key values as listed.