TIP31G Equivalent & Substitute Parts

Part Overview

The TIP31G is an NPN Bipolar Junction Transistor (BJT) manufactured by onsemi, housed in a TO-220-3 package for through-hole mounting. This device is rated for 40 V collector-emitter breakdown voltage with a maximum collector current of 3 A and 2 W power dissipation. The TIP31G is classified as Last Time Buy, indicating discontinued production status. Identification of equivalent substitute parts is necessary to ensure continued component availability for new designs, repairs, and production continuity.

Substiute Parts

TIP31G

onsemiIn Stock: 1650TIP31G Datasheet

Current PartRFQ

TIP31CG

onsemiIn Stock: 6765TIP31CG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TIP31G is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Transistor Type: NPN (must match)
• Current - Collector (Ic) (Max): 3 A (must equal or exceed)
• Power - Max: 2 W (must equal or exceed)
• Vce Saturation (Max) @ Ib, Ic: 1.2V @ 375mA, 3A (must match or be lower)
• DC Current Gain (hFE) (Min) @ Ic, Vce: 10 @ 3A, 4V (must equal or exceed)
• Frequency - Transition: 3 MHz (must equal or exceed)
• Operating Temperature Range: -65°C ~ 150°C (TJ) (must match or exceed)

Mechanical Compatibility Criteria:

• Package / Case: TO-220-3 (must match)
• Mounting Type: Through Hole (must match)

Voltage Consideration: The Voltage - Collector Emitter Breakdown (Max) parameter determines the maximum voltage rating. Substitute parts may have equal or higher voltage ratings, as higher ratings provide expanded application flexibility without compromising lower-voltage circuit operation.

Parameter Comparison

Engineering Selection Recommendations

TIP31CG as Direct Substitute:

The TIP31CG is a direct electrical and mechanical substitute for the TIP31G. Both devices share identical collector current (3 A), power dissipation (2 W), saturation voltage characteristics, DC current gain, transition frequency, operating temperature range, and package configuration (TO-220-3 through-hole).

The TIP31CG features a higher Voltage - Collector Emitter Breakdown rating (100 V versus 40 V). This elevated voltage rating does not restrict its use in applications designed for the TIP31G, as the device operates within the lower voltage envelope of the original specification.

Compliance and Availability:

Both the TIP31G and TIP31CG maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment. The TIP31CG carries Active product status with 6666 units in stock, providing superior supply chain continuity compared to the TIP31G Last Time Buy designation.

Application Continuity:

The TIP31CG is suitable for direct replacement in existing TIP31G circuit designs without modification to PCB layouts, thermal management, or electrical interface requirements.

Frequently Asked Questions (FAQ)

Q: Can the TIP31CG replace the TIP31G in all applications?

A: Yes. The TIP31CG meets or exceeds all electrical parameters of the TIP31G. The higher voltage rating (100 V versus 40 V) expands application flexibility without compromising performance in 40 V circuits.

Q: Are there package differences between TIP31G and TIP31CG?

A: No. Both devices use the TO-220-3 package with through-hole mounting. PCB footprints and thermal interface requirements are identical.

Q: What is the significance of the higher voltage rating on the TIP31CG?

A: The 100 V rating on the TIP31CG provides margin for circuits operating near the 40 V limit of the TIP31G. This does not affect operation in lower-voltage applications.

Q: Are compliance certifications identical?

A: Yes. Both TIP31G and TIP31CG are ROHS3 compliant and REACH Unaffected, meeting the same regulatory requirements.

Q: Why is the TIP31G listed as Last Time Buy?

A: Last Time Buy status indicates onsemi has discontinued production of the TIP31G. The TIP31CG, with Active status, represents the current production equivalent.

Q: Do saturation voltage characteristics differ?

A: No. Both devices specify 1.2 V maximum saturation voltage at 375 mA base current and 3 A collector current, ensuring identical switching performance.

Q: Is thermal management different between the two parts?

A: No. Both devices are rated for 2 W maximum power dissipation and use identical TO-220-3 packages, requiring equivalent thermal design considerations.