TIP31 PBFREE Equivalent & Substitute Parts

Part Overview

The TIP31 PBFREE is an NPN bipolar junction transistor manufactured by Central Semiconductor Corp, designed for general-purpose switching and amplification applications. This device operates at 40 V collector-emitter breakdown voltage with a maximum collector current of 3 A and 40 W power dissipation capability. The part is classified as obsolete, which necessitates identification of active equivalent alternatives to ensure continued design support and procurement availability. Substitute parts must maintain identical electrical performance characteristics and compatible mechanical packaging to ensure direct replacement without circuit redesign.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the TIP31 PBFREE is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

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

Mechanical Equivalence Criteria:

Mounting Type must be Through Hole
Package / Case must be TO-220-3 or compatible TO-220 variant

The TIP31 manufactured by Solid State Inc. meets all electrical and mechanical equivalence requirements and is classified as an active product, providing continued availability and supply chain support.

Parameter Comparison

Parameter	TIP31 PBFREE (Central Semiconductor)	TIP31 (Solid State Inc.)	Match Status
Transistor Type	NPN	NPN	Equivalent
Voltage - Collector Emitter Breakdown (Max)	40 V	40 V	Equivalent
Current - Collector (Ic) (Max)	3 A	3 A	Equivalent
Power - Max	40 W	40 W	Equivalent
Vce Saturation (Max) @ Ib, Ic	1.2V @ 375mA, 3A	1.2V @ 375mA, 3A	Equivalent
Current - Collector Cutoff (Max)	300µA	300µA	Equivalent
DC Current Gain (hFE) (Min) @ Ic, Vce	25 @ 1A, 4V	25 @ 1A, 4V	Equivalent
Frequency - Transition	3 MHz	3 MHz	Equivalent
Operating Temperature Range	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	TO-220-3	TO-220-3	Equivalent
Product Status	Obsolete	Active	Substitute is Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent

Engineering Selection Recommendations

The TIP31 manufactured by Solid State Inc. is the direct parametric equivalent for the obsolete TIP31 PBFREE from Central Semiconductor Corp. Both devices are ROHS3 compliant and maintain identical electrical specifications across all critical performance parameters. The Solid State Inc. variant is classified as an active product with 3700 units in stock, ensuring procurement availability and supply chain continuity.

Selection of the Solid State Inc. TIP31 is appropriate for applications requiring direct replacement of the Central Semiconductor TIP31 PBFREE without circuit modification. Both parts are qualified for identical operating conditions, voltage ratings, current handling, and thermal performance within the -65°C to 150°C junction temperature range.

Frequently Asked Questions (FAQ)

Q: Can the TIP31 from Solid State Inc. be used as a direct replacement for the Central Semiconductor TIP31 PBFREE?

A: Yes. Both devices are electrically and mechanically equivalent. All critical parameters including voltage rating (40 V), current rating (3 A), power dissipation (40 W), saturation voltage, current gain, and transition frequency are identical. Both use the TO-220-3 through-hole package.

Q: What is the primary reason to substitute the Central Semiconductor TIP31 PBFREE?

A: The Central Semiconductor TIP31 PBFREE is classified as obsolete. The Solid State Inc. TIP31 is an active product with confirmed inventory availability, ensuring continued procurement support and supply chain reliability.

Q: Are there any compliance differences between the two parts?

A: Both parts are ROHS3 compliant. The Central Semiconductor part lists REACH status as REACH Unaffected, while the Solid State Inc. part lists REACH status as Vendor Undefined. Both parts carry the same ECCN classification (EAR99).

Q: Is the TO-220 package variant from Solid State Inc. compatible with TO-220-3 designs?

A: The Solid State Inc. TIP31 is supplied in TO-220-3 package format, which is mechanically and electrically compatible with existing TO-220-3 circuit board layouts and thermal management solutions.

Q: What inventory status should be considered when selecting between these parts?

A: The Central Semiconductor TIP31 PBFREE has 683 units in stock but is obsolete. The Solid State Inc. TIP31 has 3700 units in stock and is an active product, providing superior long-term availability and supply security.

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