TIP31A PBFREE Equivalent & Substitute Parts

Part Overview

The TIP31A PBFREE is an NPN bipolar junction transistor manufactured by Central Semiconductor Corp, designed for general-purpose switching and amplification applications. This device operates at 60 V collector-emitter breakdown voltage with a maximum collector current of 3 A and 40 W power dissipation in a Through Hole TO-220-3 package.

The TIP31A PBFREE is classified as Obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor topology.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	3	A
Voltage - Collector Emitter Breakdown (Max)	60	V
Vce Saturation (Max)	1.2	V @ 375mA, 3A
Current - Collector Cutoff (Max)	300	µA
DC Current Gain (hFE) Min	25	@ 1A, 4V
Power - Max	40	W
Frequency - Transition	3	MHz
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TIP31A PBFREE is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Parameters (Must Match):

Transistor Type: NPN
Current - Collector (Ic) Max: 3 A
Voltage - Collector Emitter Breakdown (Max): 60 V
Vce Saturation (Max): 1.2 V @ 375mA, 3A
Current - Collector Cutoff (Max): 300 µA
DC Current Gain (hFE) Min: 25 @ 1A, 4V
Power - Max: 40 W
Frequency - Transition: 3 MHz
Operating Temperature Range: -65°C to 150°C (TJ)

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: TO-220-3

The substitute part TIP31A from Solid State Inc. meets all specified electrical and mechanical parameters. This part is classified as Active product status, ensuring ongoing availability and supply chain support.

Parameter Comparison

Parameter	TIP31A PBFREE (Central Semiconductor Corp)	TIP31A (Solid State Inc.)	Match
Transistor Type	NPN	NPN	✓
Current - Collector (Ic) Max	3 A	3 A	✓
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	✓
Vce Saturation (Max)	1.2 V @ 375mA, 3A	1.2 V @ 375mA, 3A	✓
Current - Collector Cutoff (Max)	300 µA	300 µA	✓
DC Current Gain (hFE) Min	25 @ 1A, 4V	25 @ 1A, 4V	✓
Power - Max	40 W	40 W	✓
Frequency - Transition	3 MHz	3 MHz	✓
Operating Temperature Range	-65 to 150 °C (TJ)	-65 to 150 °C (TJ)	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	TO-220-3	TO-220-3	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The TIP31A from Solid State Inc. is a direct parametric equivalent to the TIP31A PBFREE from Central Semiconductor Corp. Both devices are ROHS3 Compliant, meeting environmental and regulatory requirements for electronic component manufacturing and deployment.

The primary advantage of selecting the Solid State Inc. TIP31A is its Active product status. This classification ensures continued manufacturing, documented supply chain availability, and technical support. The original TIP31A PBFREE, classified as Obsolete, presents supply chain risk and limited access to future inventory.

All electrical specifications, mechanical dimensions, and thermal operating ranges are identical between the two parts. Direct substitution is supported without circuit redesign or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can the TIP31A from Solid State Inc. be used as a direct replacement for the TIP31A PBFREE?

A: Yes. Both devices share identical electrical parameters (3 A collector current, 60 V breakdown voltage, 40 W power dissipation, 3 MHz transition frequency) and mechanical specifications (Through Hole TO-220-3 package). Direct substitution is supported without circuit modification.

Q: What is the significance of the Obsolete product status for the TIP31A PBFREE?

A: Obsolete status indicates that the manufacturer has discontinued production. This creates supply chain constraints and limits access to new inventory. The Active status of the Solid State Inc. TIP31A ensures ongoing availability and manufacturing support.

Q: Are there any package differences between these two parts?

A: Both parts use the TO-220-3 Through Hole package. Physical dimensions, pin configuration, and mounting requirements are identical. No PCB layout modifications are required.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the TIP31A PBFREE and TIP31A from Solid State Inc. are ROHS3 Compliant, meeting environmental and regulatory requirements for lead-free manufacturing and deployment.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution is determined by matching transistor type (NPN), collector current (3 A), collector-emitter breakdown voltage (60 V), saturation voltage (1.2 V), cutoff current (300 µA), DC current gain (25 minimum), power dissipation (40 W), transition frequency (3 MHz), and operating temperature range (-65°C to 150°C).

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