TIP31E-S Equivalent & Substitute Parts Reference

Part Overview

The Bourns Inc. TIP31E-S is a silicon NPN bipolar junction transistor (BJT) categorized under “Transistors, Bipolar (BJT).” It features a maximum collector-emitter voltage of 140 V, collector current of 3 A, and power dissipation of 2 W, housed in a TO-220-3 through-hole package. The TIP31E-S has been classified as "Obsolete," necessitating the identification of equivalent or substitute parts to ensure ongoing manufacturability and service support for designs that specify this model.

Key Parameters

Parameter	TIP31E-S
Transistor Type	NPN
Current - Collector (Ic) (Max)	3 A
Voltage - Collector Emitter Breakdown (Max)	140 V
Vce Saturation (Max) @ Ib, Ic	2.5V @ 750mA, 3A
Current - Collector Cutoff (Max)	300µA
DC Current Gain (hFE) (Min) @ Ic, Vce	25 @ 1A, 4V
Power - Max	2 W
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute part selection for TIP31E-S is based strictly on essential electrical parameters and package compatibility. Key requirements include transistor polarity (NPN), maximum collector current (3 A), sufficient collector-emitter breakdown voltage, similar power dissipation (2 W), collector cutoff current (300µA), mechanical compatibility (Through Hole, TO-220-3), and RoHS compliance. Only substitute parts exactly matching or exceeding these criteria are considered equivalent for engineering use.

Key parameters governing substitution:

Transistor Type: NPN
Collector Current (Ic): 3 A
Collector-Emitter Breakdown Voltage (Vce): ≥ 100 V
Power Dissipation: 2 W
Mounting Type: Through Hole
Package: TO-220-3
RoHS Compliance

Parameter Comparison

Parameter	TIP31E-S Bourns Inc.	TIP31C-BP Micro Commercial Co
Transistor Type	NPN	NPN
Current - Collector (Ic) (Max)	3 A	3 A
Voltage - Collector Emitter Breakdown (Max)	140 V	100 V
Vce Saturation (Max) @ Ib, Ic	2.5V @ 750mA, 3A	1.2V @ 375mA, 3A
Current - Collector Cutoff (Max)	300µA	300µA
DC Current Gain (hFE) (Min) @ Ic, Vce	25 @ 1A, 4V	10 @ 3A, 4V
Power - Max	2 W	2 W
Mounting Type	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The TIP31E-S is classified as obsolete, while the substitute TIP31C-BP is listed as active and RoHS3 compliant. Both models offer through-hole mounting and TO-220 package compatibility and do not have moisture sensitivity restrictions (MSL 1, unlimited). All selection criteria in this context are based solely on product status and compliance information provided.

Frequently Asked Questions (FAQ)

Q1: What determines if a part is a valid substitute for TIP31E-S?
A1: Substitute parts must match transistor polarity (NPN), collector current (3 A), collector-emitter breakdown voltage (≥ 100 V), power dissipation (2 W), mounting (Through Hole), package (TO-220-3), and RoHS compliance.

Q2: Are the packages for TIP31E-S and TIP31C-BP physically compatible?
A2: Both components use a TO-220-3 through-hole package, ensuring mechanical and assembly compatibility.

Q3: Is product compliance (RoHS, MSL) maintained in the substitute?
A3: Both original and substitute parts are RoHS3 compliant and specified at MSL 1 (unlimited), maintaining environmental and manufacturing standards.

Q4: Why is substitution required for TIP31E-S?
A4: TIP31E-S is obsolete. Identifying substitutes maintains supply continuity for ongoing or legacy designs.

Q5: Which key parameters cannot be compromised during substitution?
A5: Polarity, maximum collector current and voltage, mechanical package, mounting style, and compliance/certification status must be maintained for a valid substitution.

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